Merge branch 'master' of https://github.com/tildearrow/furnace into es5506_alt

* 'master' of https://github.com/tildearrow/furnace: (64 commits)
  finish wave synth!
  update contributing guidelines
  Namco WSG: make non-linear slides faster
  wave synth work
  SoundUnit: fix order of filter bits
  GUI: add Namco arcade presets
  implement some dual wave synth effects
  Y8950: fix ADPCM VGM export
  Namco WSG: finish it up
  Namco WSG: 8 channel WSG (CUS30) now works
  Namco WSG: muting
  Namco WSG: 8 channel WSG (15xx) now works
  Namco WSG: 3 channel WSG now works
  YM2612: change key on/off strategy
  GUI: fix scrollbars not working
  Please enter the commit message for your changes.
  shhhhhhhhhhhh
  update to-do list
  Whoops
  it doesn't work (yet)
  ...

# Conflicts:
#	src/engine/dispatch.h
#	src/engine/platform/su.cpp
#	src/engine/playback.cpp
#	src/engine/sample.cpp
#	src/engine/sample.h
#	src/engine/song.h
#	src/engine/vgmOps.cpp
#	src/gui/presets.cpp

.gitignore

@@ -18,3 +18,4 @@ android/app/.cxx/
 .vs/
 CMakeSettings.json
 CMakePresets.json
+extern/imgui_patched/examples/

.gitmodules

@@ -4,15 +4,11 @@
 [submodule "extern/SDL"]
 	path = extern/SDL
 	url = https://github.com/libsdl-org/SDL.git
-	branch = main
+	branch = 2.0.22
 [submodule "extern/libsndfile"]
 	path = extern/libsndfile
 	url = https://github.com/libsndfile/libsndfile.git
 	branch = master
-[submodule "extern/imgui"]
-	path = extern/imgui
-	url = https://github.com/ocornut/imgui.git
-	branch = docking
 [submodule "extern/fmt"]
 	path = extern/fmt
 	url = https://github.com/fmtlib/fmt.git

CMakeLists.txt

@@ -256,6 +256,7 @@ extern/opl/opl3.c
 src/engine/platform/sound/sn76496.cpp
 src/engine/platform/sound/ay8910.cpp
 src/engine/platform/sound/saa1099.cpp
+src/engine/platform/sound/namco.cpp
 src/engine/platform/sound/gb/apu.c
 src/engine/platform/sound/gb/timing.c
 src/engine/platform/sound/pce_psg.cpp
@@ -325,6 +326,10 @@ src/engine/platform/sound/es550x/es5506.cpp
 
 src/engine/platform/sound/scc/scc.cpp
 
+src/engine/platform/sound/ymz280b.cpp
+
+src/engine/platform/sound/rf5c68.cpp
+
 src/engine/platform/oplAInterface.cpp
 src/engine/platform/ym2608Interface.cpp
 src/engine/platform/ym2610Interface.cpp
@@ -363,6 +368,7 @@ src/engine/platform/tx81z.cpp
 src/engine/platform/ym2203.cpp
 src/engine/platform/ym2203ext.cpp
 src/engine/platform/ym2608.cpp
+src/engine/platform/ym2608ext.cpp
 src/engine/platform/ym2610.cpp
 src/engine/platform/ym2610ext.cpp
 src/engine/platform/ym2610b.cpp
@@ -390,6 +396,9 @@ src/engine/platform/vic20.cpp
 src/engine/platform/vrc6.cpp
 src/engine/platform/es5506.cpp
 src/engine/platform/scc.cpp
+src/engine/platform/ymz280b.cpp
+src/engine/platform/namcowsg.cpp
+src/engine/platform/rf5c68.cpp
 src/engine/platform/dummy.cpp
 )
 
@@ -400,13 +409,13 @@ if (WIN32)
 endif()
 
 set(GUI_SOURCES
-extern/imgui/imgui.cpp
+extern/imgui_patched/imgui.cpp
-extern/imgui/imgui_draw.cpp
+extern/imgui_patched/imgui_draw.cpp
-extern/imgui/imgui_tables.cpp
+extern/imgui_patched/imgui_tables.cpp
-extern/imgui/imgui_widgets.cpp
+extern/imgui_patched/imgui_widgets.cpp
-extern/imgui_patched/imgui_impl_sdlrenderer.cpp
+extern/imgui_patched/backends/imgui_impl_sdlrenderer.cpp
-extern/imgui_patched/imgui_impl_sdl.cpp
+extern/imgui_patched/backends/imgui_impl_sdl.cpp
-extern/imgui/misc/cpp/imgui_stdlib.cpp
+extern/imgui_patched/misc/cpp/imgui_stdlib.cpp
 extern/igfd/ImGuiFileDialog.cpp
 
 src/gui/plot_nolerp.cpp
@@ -475,9 +484,9 @@ set(USED_SOURCES ${ENGINE_SOURCES} ${AUDIO_SOURCES} src/main.cpp)
 if (BUILD_GUI)
   list(APPEND USED_SOURCES ${GUI_SOURCES})
   list(APPEND DEPENDENCIES_INCLUDE_DIRS
-    extern/imgui
+    extern/imgui_patched
     extern/imgui_conf
-    extern/imgui/backends
+    extern/imgui_patched/backends
     extern/IconFontCppHeaders
     extern/igfd
   )

CONTRIBUTING.md

@@ -72,7 +72,10 @@ additional guidelines:
 
 ## Demo Songs
 
-just put your demo song in `demos/`!
+just put your demo song in `demos/`! be noted there are some guidelines:
+
+- avoid Nintendo song covers.
+- avoid big label song covers.
 
 # Finishing
 

TODO.md

@@ -6,16 +6,16 @@
 
 # to-do for 0.6pre1
 
-- piano/input pad
+- additional YM2612 features
-  - note input via piano
+  - CSM
-  - input pad
+  - DualPCM
-  - settings
+  - reverse sample playback
-- RF5C68 system
-- ZX beeper system overlay percussion
 - ADPCM chips
 - Game Boy envelope macro/sequence
+- drag-and-drop ins/wave/sample loading
+- "set loop" in right click menu of sample editor
+- sample editor preview in selection
 - rewrite the system name detection function anyway
-- scroll instrument/wave/sample list when selecting item
 - unified data view
 - volume commands should work on Game Boy
 - add another FM editor layout
@@ -26,5 +26,4 @@
 - add ability to move selection by dragging
 - Apply button in settings
 - find and replace
-- finish wave synth
 - add mono/poly note preview button

extern/imgui

@@ -1 +0,0 @@
-Subproject commit 1ee252772ae9c0a971d06257bb5c89f628fa696a

extern/imgui_patched/.editorconfig

@@ -0,0 +1,24 @@
+# See http://editorconfig.org to read about the EditorConfig format.
+# - In theory automatically supported by VS2017+ and most common IDE or text editors.
+# - In practice VS2019 stills gets trailing whitespaces wrong :(
+#   - Suggest install to trim whitespaces: https://marketplace.visualstudio.com/items?itemName=MadsKristensen.TrailingWhitespaceVisualizer
+#   - Alternative for older VS2010 to VS2015: https://marketplace.visualstudio.com/items?itemName=EditorConfigTeam.EditorConfig
+
+# top-most EditorConfig file
+root = true
+
+# Default settings:
+# Use 4 spaces as indentation
+[*]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[imstb_*]
+indent_size = 3
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
+indent_size = 4

extern/imgui_patched/.gitattributes

@@ -0,0 +1,30 @@
+* text=auto
+
+*.c text
+*.cpp text
+*.h text
+*.m text
+*.mm text
+*.md text
+*.txt text
+*.html text
+*.bat text
+*.frag text
+*.vert text
+*.mkb text
+*.icf text
+
+*.sln text eol=crlf
+*.vcxproj text eol=crlf
+*.vcxproj.filters text eol=crlf
+*.natvis text eol=crlf
+
+Makefile text eol=lf
+*.sh text eol=lf
+*.pbxproj text eol=lf
+*.storyboard text eol=lf
+*.plist text eol=lf
+
+*.png binary
+*.ttf binary
+*.lib binary

extern/imgui_patched/.gitignore

@@ -0,0 +1,53 @@
+## OSX artifacts
+.DS_Store
+
+## Dear ImGui artifacts
+imgui.ini
+
+## General build artifacts
+*.o
+*.obj
+*.exe
+examples/build/*
+examples/*/Debug/*
+examples/*/Release/*
+examples/*/x64/*
+
+## Visual Studio artifacts
+.vs
+ipch
+*.opensdf
+*.log
+*.pdb
+*.ilk
+*.user
+*.sdf
+*.suo
+*.VC.db
+*.VC.VC.opendb
+
+## Commonly used CMake directories
+/build*/
+
+## Xcode artifacts
+project.xcworkspace
+xcuserdata
+
+## Emscripten artifacts
+examples/*.o.tmp
+examples/*.out.js
+examples/*.out.wasm
+examples/example_emscripten_opengl3/web/*
+examples/example_emscripten_wgpu/web/*
+
+## JetBrains IDE artifacts
+.idea
+cmake-build-*
+
+## Unix executables from our example Makefiles
+examples/example_glfw_opengl2/example_glfw_opengl2
+examples/example_glfw_opengl3/example_glfw_opengl3
+examples/example_glut_opengl2/example_glut_opengl2
+examples/example_null/example_null
+examples/example_sdl_opengl2/example_sdl_opengl2
+examples/example_sdl_opengl3/example_sdl_opengl3

extern/imgui_patched/LICENSE.txt

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014-2022 Omar Cornut
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

extern/imgui_patched/MODIFIED.md

@@ -0,0 +1,5 @@
+# modified version
+
+this is a modified version of Dear ImGui to fix UI scaling on macOS, which works in a really weird (but logical) way.
+
+further modifications may be made to suit Furnace.

extern/imgui_patched/backends/imgui_impl_allegro5.cpp

@@ -0,0 +1,581 @@
+// dear imgui: Renderer + Platform Backend for Allegro 5
+// (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy ALLEGRO_KEY_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+//  [X] Platform: Clipboard support (from Allegro 5.1.12)
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+// Issues:
+//  [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
+//  [ ] Platform: Missing gamepad support.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago)with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
+//  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).
+//  2022-01-17: Inputs: always calling io.AddKeyModsEvent() next and before key event (not in NewFrame) to fix input queue with very low framerates.
+//  2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range.
+//  2021-12-08: Renderer: Fixed mishandling of the the ImDrawCmd::IdxOffset field! This is an old bug but it never had an effect until some internal rendering changes in 1.86.
+//  2021-08-17: Calling io.AddFocusEvent() on ALLEGRO_EVENT_DISPLAY_SWITCH_OUT/ALLEGRO_EVENT_DISPLAY_SWITCH_IN events.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-05-19: Renderer: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-02-18: Change blending equation to preserve alpha in output buffer.
+//  2020-08-10: Inputs: Fixed horizontal mouse wheel direction.
+//  2019-12-05: Inputs: Added support for ImGuiMouseCursor_NotAllowed mouse cursor.
+//  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
+//  2019-05-11: Inputs: Don't filter character value from ALLEGRO_EVENT_KEY_CHAR before calling AddInputCharacter().
+//  2019-04-30: Renderer: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2018-11-30: Platform: Added touchscreen support.
+//  2018-11-30: Misc: Setting up io.BackendPlatformName/io.BackendRendererName so they can be displayed in the About Window.
+//  2018-06-13: Platform: Added clipboard support (from Allegro 5.1.12).
+//  2018-06-13: Renderer: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-06-13: Renderer: Backup/restore transform and clipping rectangle.
+//  2018-06-11: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
+//  2018-04-18: Misc: Renamed file from imgui_impl_a5.cpp to imgui_impl_allegro5.cpp.
+//  2018-04-18: Misc: Added support for 32-bit vertex indices to avoid conversion at runtime. Added imconfig_allegro5.h to enforce 32-bit indices when included from imgui.h.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplAllegro5_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+
+#include <stdint.h>     // uint64_t
+#include <cstring>      // memcpy
+#include "imgui.h"
+#include "imgui_impl_allegro5.h"
+
+// Allegro
+#include <allegro5/allegro.h>
+#include <allegro5/allegro_primitives.h>
+#ifdef _WIN32
+#include <allegro5/allegro_windows.h>
+#endif
+#define ALLEGRO_HAS_CLIPBOARD   (ALLEGRO_VERSION_INT >= ((5 << 24) | (1 << 16) | (12 << 8)))    // Clipboard only supported from Allegro 5.1.12
+
+// Visual Studio warnings
+#ifdef _MSC_VER
+#pragma warning (disable: 4127) // condition expression is constant
+#endif
+
+// Allegro Data
+struct ImGui_ImplAllegro5_Data
+{
+    ALLEGRO_DISPLAY*            Display;
+    ALLEGRO_BITMAP*             Texture;
+    double                      Time;
+    ALLEGRO_MOUSE_CURSOR*       MouseCursorInvisible;
+    ALLEGRO_VERTEX_DECL*        VertexDecl;
+    char*                       ClipboardTextData;
+
+    ImGui_ImplAllegro5_Data()   { memset((void*)this, 0, sizeof(*this)); }
+};
+
+// Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+// FIXME: multi-context support is not well tested and probably dysfunctional in this backend.
+static ImGui_ImplAllegro5_Data* ImGui_ImplAllegro5_GetBackendData()     { return ImGui::GetCurrentContext() ? (ImGui_ImplAllegro5_Data*)ImGui::GetIO().BackendPlatformUserData : NULL; }
+
+struct ImDrawVertAllegro
+{
+    ImVec2 pos;
+    ImVec2 uv;
+    ALLEGRO_COLOR col;
+};
+
+static void ImGui_ImplAllegro5_SetupRenderState(ImDrawData* draw_data)
+{
+    // Setup blending
+    al_set_separate_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA, ALLEGRO_ADD, ALLEGRO_ONE, ALLEGRO_INVERSE_ALPHA);
+
+    // Setup orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
+    {
+        float L = draw_data->DisplayPos.x;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+        float T = draw_data->DisplayPos.y;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+        ALLEGRO_TRANSFORM transform;
+        al_identity_transform(&transform);
+        al_use_transform(&transform);
+        al_orthographic_transform(&transform, L, T, 1.0f, R, B, -1.0f);
+        al_use_projection_transform(&transform);
+    }
+}
+
+// Render function.
+void ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
+    // Backup Allegro state that will be modified
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    ALLEGRO_TRANSFORM last_transform = *al_get_current_transform();
+    ALLEGRO_TRANSFORM last_projection_transform = *al_get_current_projection_transform();
+    int last_clip_x, last_clip_y, last_clip_w, last_clip_h;
+    al_get_clipping_rectangle(&last_clip_x, &last_clip_y, &last_clip_w, &last_clip_h);
+    int last_blender_op, last_blender_src, last_blender_dst;
+    al_get_blender(&last_blender_op, &last_blender_src, &last_blender_dst);
+
+    // Setup desired render state
+    ImGui_ImplAllegro5_SetupRenderState(draw_data);
+
+    // Render command lists
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+
+        // Allegro's implementation of al_draw_indexed_prim() for DX9 is completely broken. Unindex our buffers ourselves.
+        // FIXME-OPT: Unfortunately Allegro doesn't support 32-bit packed colors so we have to convert them to 4 float as well..
+        static ImVector<ImDrawVertAllegro> vertices;
+        vertices.resize(cmd_list->IdxBuffer.Size);
+        for (int i = 0; i < cmd_list->IdxBuffer.Size; i++)
+        {
+            const ImDrawVert* src_v = &cmd_list->VtxBuffer[cmd_list->IdxBuffer[i]];
+            ImDrawVertAllegro* dst_v = &vertices[i];
+            dst_v->pos = src_v->pos;
+            dst_v->uv = src_v->uv;
+            unsigned char* c = (unsigned char*)&src_v->col;
+            dst_v->col = al_map_rgba(c[0], c[1], c[2], c[3]);
+        }
+
+        const int* indices = NULL;
+        if (sizeof(ImDrawIdx) == 2)
+        {
+            // FIXME-OPT: Unfortunately Allegro doesn't support 16-bit indices.. You can '#define ImDrawIdx int' in imconfig.h to request Dear ImGui to output 32-bit indices.
+            // Otherwise, we convert them from 16-bit to 32-bit at runtime here, which works perfectly but is a little wasteful.
+            static ImVector<int> indices_converted;
+            indices_converted.resize(cmd_list->IdxBuffer.Size);
+            for (int i = 0; i < cmd_list->IdxBuffer.Size; ++i)
+                indices_converted[i] = (int)cmd_list->IdxBuffer.Data[i];
+            indices = indices_converted.Data;
+        }
+        else if (sizeof(ImDrawIdx) == 4)
+        {
+            indices = (const int*)cmd_list->IdxBuffer.Data;
+        }
+
+        // Render command lists
+        ImVec2 clip_off = draw_data->DisplayPos;
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplAllegro5_SetupRenderState(draw_data);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
+                ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle, Draw
+                ALLEGRO_BITMAP* texture = (ALLEGRO_BITMAP*)pcmd->GetTexID();
+                al_set_clipping_rectangle(clip_min.x, clip_min.y, clip_max.x - clip_min.x, clip_max.y - clip_min.y);
+                al_draw_prim(&vertices[0], bd->VertexDecl, texture, pcmd->IdxOffset, pcmd->IdxOffset + pcmd->ElemCount, ALLEGRO_PRIM_TRIANGLE_LIST);
+            }
+        }
+    }
+
+    // Restore modified Allegro state
+    al_set_blender(last_blender_op, last_blender_src, last_blender_dst);
+    al_set_clipping_rectangle(last_clip_x, last_clip_y, last_clip_w, last_clip_h);
+    al_use_transform(&last_transform);
+    al_use_projection_transform(&last_projection_transform);
+}
+
+bool ImGui_ImplAllegro5_CreateDeviceObjects()
+{
+    // Build texture atlas
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    ImGuiIO& io = ImGui::GetIO();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+
+    // Create texture
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    int flags = al_get_new_bitmap_flags();
+    int fmt = al_get_new_bitmap_format();
+    al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP | ALLEGRO_MIN_LINEAR | ALLEGRO_MAG_LINEAR);
+    al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE);
+    ALLEGRO_BITMAP* img = al_create_bitmap(width, height);
+    al_set_new_bitmap_flags(flags);
+    al_set_new_bitmap_format(fmt);
+    if (!img)
+        return false;
+
+    ALLEGRO_LOCKED_REGION* locked_img = al_lock_bitmap(img, al_get_bitmap_format(img), ALLEGRO_LOCK_WRITEONLY);
+    if (!locked_img)
+    {
+        al_destroy_bitmap(img);
+        return false;
+    }
+    memcpy(locked_img->data, pixels, sizeof(int) * width * height);
+    al_unlock_bitmap(img);
+
+    // Convert software texture to hardware texture.
+    ALLEGRO_BITMAP* cloned_img = al_clone_bitmap(img);
+    al_destroy_bitmap(img);
+    if (!cloned_img)
+        return false;
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)(intptr_t)cloned_img);
+    bd->Texture = cloned_img;
+
+    // Create an invisible mouse cursor
+    // Because al_hide_mouse_cursor() seems to mess up with the actual inputs..
+    ALLEGRO_BITMAP* mouse_cursor = al_create_bitmap(8, 8);
+    bd->MouseCursorInvisible = al_create_mouse_cursor(mouse_cursor, 0, 0);
+    al_destroy_bitmap(mouse_cursor);
+
+    return true;
+}
+
+void ImGui_ImplAllegro5_InvalidateDeviceObjects()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    if (bd->Texture)
+    {
+        io.Fonts->SetTexID(NULL);
+        al_destroy_bitmap(bd->Texture);
+        bd->Texture = NULL;
+    }
+    if (bd->MouseCursorInvisible)
+    {
+        al_destroy_mouse_cursor(bd->MouseCursorInvisible);
+        bd->MouseCursorInvisible = NULL;
+    }
+}
+
+#if ALLEGRO_HAS_CLIPBOARD
+static const char* ImGui_ImplAllegro5_GetClipboardText(void*)
+{
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    if (bd->ClipboardTextData)
+        al_free(bd->ClipboardTextData);
+    bd->ClipboardTextData = al_get_clipboard_text(bd->Display);
+    return bd->ClipboardTextData;
+}
+
+static void ImGui_ImplAllegro5_SetClipboardText(void*, const char* text)
+{
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    al_set_clipboard_text(bd->Display, text);
+}
+#endif
+
+static ImGuiKey ImGui_ImplAllegro5_KeyCodeToImGuiKey(int key_code)
+{
+    switch (key_code)
+    {
+        case ALLEGRO_KEY_TAB: return ImGuiKey_Tab;
+        case ALLEGRO_KEY_LEFT: return ImGuiKey_LeftArrow;
+        case ALLEGRO_KEY_RIGHT: return ImGuiKey_RightArrow;
+        case ALLEGRO_KEY_UP: return ImGuiKey_UpArrow;
+        case ALLEGRO_KEY_DOWN: return ImGuiKey_DownArrow;
+        case ALLEGRO_KEY_PGUP: return ImGuiKey_PageUp;
+        case ALLEGRO_KEY_PGDN: return ImGuiKey_PageDown;
+        case ALLEGRO_KEY_HOME: return ImGuiKey_Home;
+        case ALLEGRO_KEY_END: return ImGuiKey_End;
+        case ALLEGRO_KEY_INSERT: return ImGuiKey_Insert;
+        case ALLEGRO_KEY_DELETE: return ImGuiKey_Delete;
+        case ALLEGRO_KEY_BACKSPACE: return ImGuiKey_Backspace;
+        case ALLEGRO_KEY_SPACE: return ImGuiKey_Space;
+        case ALLEGRO_KEY_ENTER: return ImGuiKey_Enter;
+        case ALLEGRO_KEY_ESCAPE: return ImGuiKey_Escape;
+        case ALLEGRO_KEY_QUOTE: return ImGuiKey_Apostrophe;
+        case ALLEGRO_KEY_COMMA: return ImGuiKey_Comma;
+        case ALLEGRO_KEY_MINUS: return ImGuiKey_Minus;
+        case ALLEGRO_KEY_FULLSTOP: return ImGuiKey_Period;
+        case ALLEGRO_KEY_SLASH: return ImGuiKey_Slash;
+        case ALLEGRO_KEY_SEMICOLON: return ImGuiKey_Semicolon;
+        case ALLEGRO_KEY_EQUALS: return ImGuiKey_Equal;
+        case ALLEGRO_KEY_OPENBRACE: return ImGuiKey_LeftBracket;
+        case ALLEGRO_KEY_BACKSLASH: return ImGuiKey_Backslash;
+        case ALLEGRO_KEY_CLOSEBRACE: return ImGuiKey_RightBracket;
+        case ALLEGRO_KEY_TILDE: return ImGuiKey_GraveAccent;
+        case ALLEGRO_KEY_CAPSLOCK: return ImGuiKey_CapsLock;
+        case ALLEGRO_KEY_SCROLLLOCK: return ImGuiKey_ScrollLock;
+        case ALLEGRO_KEY_NUMLOCK: return ImGuiKey_NumLock;
+        case ALLEGRO_KEY_PRINTSCREEN: return ImGuiKey_PrintScreen;
+        case ALLEGRO_KEY_PAUSE: return ImGuiKey_Pause;
+        case ALLEGRO_KEY_PAD_0: return ImGuiKey_Keypad0;
+        case ALLEGRO_KEY_PAD_1: return ImGuiKey_Keypad1;
+        case ALLEGRO_KEY_PAD_2: return ImGuiKey_Keypad2;
+        case ALLEGRO_KEY_PAD_3: return ImGuiKey_Keypad3;
+        case ALLEGRO_KEY_PAD_4: return ImGuiKey_Keypad4;
+        case ALLEGRO_KEY_PAD_5: return ImGuiKey_Keypad5;
+        case ALLEGRO_KEY_PAD_6: return ImGuiKey_Keypad6;
+        case ALLEGRO_KEY_PAD_7: return ImGuiKey_Keypad7;
+        case ALLEGRO_KEY_PAD_8: return ImGuiKey_Keypad8;
+        case ALLEGRO_KEY_PAD_9: return ImGuiKey_Keypad9;
+        case ALLEGRO_KEY_PAD_DELETE: return ImGuiKey_KeypadDecimal;
+        case ALLEGRO_KEY_PAD_SLASH: return ImGuiKey_KeypadDivide;
+        case ALLEGRO_KEY_PAD_ASTERISK: return ImGuiKey_KeypadMultiply;
+        case ALLEGRO_KEY_PAD_MINUS: return ImGuiKey_KeypadSubtract;
+        case ALLEGRO_KEY_PAD_PLUS: return ImGuiKey_KeypadAdd;
+        case ALLEGRO_KEY_PAD_ENTER: return ImGuiKey_KeypadEnter;
+        case ALLEGRO_KEY_PAD_EQUALS: return ImGuiKey_KeypadEqual;
+        case ALLEGRO_KEY_LCTRL: return ImGuiKey_LeftCtrl;
+        case ALLEGRO_KEY_LSHIFT: return ImGuiKey_LeftShift;
+        case ALLEGRO_KEY_ALT: return ImGuiKey_LeftAlt;
+        case ALLEGRO_KEY_LWIN: return ImGuiKey_LeftSuper;
+        case ALLEGRO_KEY_RCTRL: return ImGuiKey_RightCtrl;
+        case ALLEGRO_KEY_RSHIFT: return ImGuiKey_RightShift;
+        case ALLEGRO_KEY_ALTGR: return ImGuiKey_RightAlt;
+        case ALLEGRO_KEY_RWIN: return ImGuiKey_RightSuper;
+        case ALLEGRO_KEY_MENU: return ImGuiKey_Menu;
+        case ALLEGRO_KEY_0: return ImGuiKey_0;
+        case ALLEGRO_KEY_1: return ImGuiKey_1;
+        case ALLEGRO_KEY_2: return ImGuiKey_2;
+        case ALLEGRO_KEY_3: return ImGuiKey_3;
+        case ALLEGRO_KEY_4: return ImGuiKey_4;
+        case ALLEGRO_KEY_5: return ImGuiKey_5;
+        case ALLEGRO_KEY_6: return ImGuiKey_6;
+        case ALLEGRO_KEY_7: return ImGuiKey_7;
+        case ALLEGRO_KEY_8: return ImGuiKey_8;
+        case ALLEGRO_KEY_9: return ImGuiKey_9;
+        case ALLEGRO_KEY_A: return ImGuiKey_A;
+        case ALLEGRO_KEY_B: return ImGuiKey_B;
+        case ALLEGRO_KEY_C: return ImGuiKey_C;
+        case ALLEGRO_KEY_D: return ImGuiKey_D;
+        case ALLEGRO_KEY_E: return ImGuiKey_E;
+        case ALLEGRO_KEY_F: return ImGuiKey_F;
+        case ALLEGRO_KEY_G: return ImGuiKey_G;
+        case ALLEGRO_KEY_H: return ImGuiKey_H;
+        case ALLEGRO_KEY_I: return ImGuiKey_I;
+        case ALLEGRO_KEY_J: return ImGuiKey_J;
+        case ALLEGRO_KEY_K: return ImGuiKey_K;
+        case ALLEGRO_KEY_L: return ImGuiKey_L;
+        case ALLEGRO_KEY_M: return ImGuiKey_M;
+        case ALLEGRO_KEY_N: return ImGuiKey_N;
+        case ALLEGRO_KEY_O: return ImGuiKey_O;
+        case ALLEGRO_KEY_P: return ImGuiKey_P;
+        case ALLEGRO_KEY_Q: return ImGuiKey_Q;
+        case ALLEGRO_KEY_R: return ImGuiKey_R;
+        case ALLEGRO_KEY_S: return ImGuiKey_S;
+        case ALLEGRO_KEY_T: return ImGuiKey_T;
+        case ALLEGRO_KEY_U: return ImGuiKey_U;
+        case ALLEGRO_KEY_V: return ImGuiKey_V;
+        case ALLEGRO_KEY_W: return ImGuiKey_W;
+        case ALLEGRO_KEY_X: return ImGuiKey_X;
+        case ALLEGRO_KEY_Y: return ImGuiKey_Y;
+        case ALLEGRO_KEY_Z: return ImGuiKey_Z;
+        case ALLEGRO_KEY_F1: return ImGuiKey_F1;
+        case ALLEGRO_KEY_F2: return ImGuiKey_F2;
+        case ALLEGRO_KEY_F3: return ImGuiKey_F3;
+        case ALLEGRO_KEY_F4: return ImGuiKey_F4;
+        case ALLEGRO_KEY_F5: return ImGuiKey_F5;
+        case ALLEGRO_KEY_F6: return ImGuiKey_F6;
+        case ALLEGRO_KEY_F7: return ImGuiKey_F7;
+        case ALLEGRO_KEY_F8: return ImGuiKey_F8;
+        case ALLEGRO_KEY_F9: return ImGuiKey_F9;
+        case ALLEGRO_KEY_F10: return ImGuiKey_F10;
+        case ALLEGRO_KEY_F11: return ImGuiKey_F11;
+        case ALLEGRO_KEY_F12: return ImGuiKey_F12;
+        default: return ImGuiKey_None;
+    }
+}
+
+bool ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendPlatformUserData == NULL && "Already initialized a platform backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplAllegro5_Data* bd = IM_NEW(ImGui_ImplAllegro5_Data)();
+    io.BackendPlatformUserData = (void*)bd;
+    io.BackendPlatformName = io.BackendRendererName = "imgui_impl_allegro5";
+    io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;       // We can honor GetMouseCursor() values (optional)
+
+    bd->Display = display;
+
+    // Create custom vertex declaration.
+    // Unfortunately Allegro doesn't support 32-bit packed colors so we have to convert them to 4 floats.
+    // We still use a custom declaration to use 'ALLEGRO_PRIM_TEX_COORD' instead of 'ALLEGRO_PRIM_TEX_COORD_PIXEL' else we can't do a reliable conversion.
+    ALLEGRO_VERTEX_ELEMENT elems[] =
+    {
+        { ALLEGRO_PRIM_POSITION, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, pos) },
+        { ALLEGRO_PRIM_TEX_COORD, ALLEGRO_PRIM_FLOAT_2, IM_OFFSETOF(ImDrawVertAllegro, uv) },
+        { ALLEGRO_PRIM_COLOR_ATTR, 0, IM_OFFSETOF(ImDrawVertAllegro, col) },
+        { 0, 0, 0 }
+    };
+    bd->VertexDecl = al_create_vertex_decl(elems, sizeof(ImDrawVertAllegro));
+
+#if ALLEGRO_HAS_CLIPBOARD
+    io.SetClipboardTextFn = ImGui_ImplAllegro5_SetClipboardText;
+    io.GetClipboardTextFn = ImGui_ImplAllegro5_GetClipboardText;
+    io.ClipboardUserData = NULL;
+#endif
+
+    return true;
+}
+
+void ImGui_ImplAllegro5_Shutdown()
+{
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    IM_ASSERT(bd != NULL && "No platform backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplAllegro5_InvalidateDeviceObjects();
+    if (bd->VertexDecl)
+        al_destroy_vertex_decl(bd->VertexDecl);
+    if (bd->ClipboardTextData)
+        al_free(bd->ClipboardTextData);
+
+    io.BackendPlatformUserData = NULL;
+    io.BackendPlatformName = io.BackendRendererName = NULL;
+    IM_DELETE(bd);
+}
+
+// ev->keyboard.modifiers seems always zero so using that...
+static void ImGui_ImplAllegro5_UpdateKeyModifiers()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ALLEGRO_KEYBOARD_STATE keys;
+    al_get_keyboard_state(&keys);
+    io.AddKeyEvent(ImGuiKey_ModCtrl, al_key_down(&keys, ALLEGRO_KEY_LCTRL) || al_key_down(&keys, ALLEGRO_KEY_RCTRL));
+    io.AddKeyEvent(ImGuiKey_ModShift, al_key_down(&keys, ALLEGRO_KEY_LSHIFT) || al_key_down(&keys, ALLEGRO_KEY_RSHIFT));
+    io.AddKeyEvent(ImGuiKey_ModAlt, al_key_down(&keys, ALLEGRO_KEY_ALT) || al_key_down(&keys, ALLEGRO_KEY_ALTGR));
+    io.AddKeyEvent(ImGuiKey_ModSuper, al_key_down(&keys, ALLEGRO_KEY_LWIN) || al_key_down(&keys, ALLEGRO_KEY_RWIN));
+}
+
+// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
+// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
+// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
+// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
+bool ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT* ev)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+
+    switch (ev->type)
+    {
+    case ALLEGRO_EVENT_MOUSE_AXES:
+        if (ev->mouse.display == bd->Display)
+        {
+            io.AddMousePosEvent(ev->mouse.x, ev->mouse.y);
+            io.AddMouseWheelEvent(-ev->mouse.dw, ev->mouse.dz);
+        }
+        return true;
+    case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
+    case ALLEGRO_EVENT_MOUSE_BUTTON_UP:
+        if (ev->mouse.display == bd->Display && ev->mouse.button > 0 && ev->mouse.button <= 5)
+            io.AddMouseButtonEvent(ev->mouse.button - 1, ev->type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN);
+        return true;
+    case ALLEGRO_EVENT_TOUCH_MOVE:
+        if (ev->touch.display == bd->Display)
+            io.AddMousePosEvent(ev->touch.x, ev->touch.y);
+        return true;
+    case ALLEGRO_EVENT_TOUCH_BEGIN:
+    case ALLEGRO_EVENT_TOUCH_END:
+    case ALLEGRO_EVENT_TOUCH_CANCEL:
+        if (ev->touch.display == bd->Display && ev->touch.primary)
+            io.AddMouseButtonEvent(0, ev->type == ALLEGRO_EVENT_TOUCH_BEGIN);
+        return true;
+    case ALLEGRO_EVENT_MOUSE_LEAVE_DISPLAY:
+        if (ev->mouse.display == bd->Display)
+            io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
+        return true;
+    case ALLEGRO_EVENT_KEY_CHAR:
+        if (ev->keyboard.display == bd->Display)
+            if (ev->keyboard.unichar != 0)
+                io.AddInputCharacter((unsigned int)ev->keyboard.unichar);
+        return true;
+    case ALLEGRO_EVENT_KEY_DOWN:
+    case ALLEGRO_EVENT_KEY_UP:
+        if (ev->keyboard.display == bd->Display)
+        {
+            ImGui_ImplAllegro5_UpdateKeyModifiers();
+            ImGuiKey key = ImGui_ImplAllegro5_KeyCodeToImGuiKey(ev->keyboard.keycode);
+            io.AddKeyEvent(key, (ev->type == ALLEGRO_EVENT_KEY_DOWN));
+            io.SetKeyEventNativeData(key, ev->keyboard.keycode, -1); // To support legacy indexing (<1.87 user code)
+        }
+        return true;
+    case ALLEGRO_EVENT_DISPLAY_SWITCH_OUT:
+        if (ev->display.source == bd->Display)
+            io.AddFocusEvent(false);
+        return true;
+    case ALLEGRO_EVENT_DISPLAY_SWITCH_IN:
+        if (ev->display.source == bd->Display)
+        {
+            io.AddFocusEvent(true);
+#if defined(ALLEGRO_UNSTABLE)
+            al_clear_keyboard_state(bd->Display);
+#endif
+        }
+        return true;
+    }
+    return false;
+}
+
+static void ImGui_ImplAllegro5_UpdateMouseCursor()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    if (io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange)
+        return;
+
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
+    if (io.MouseDrawCursor || imgui_cursor == ImGuiMouseCursor_None)
+    {
+        // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
+        al_set_mouse_cursor(bd->Display, bd->MouseCursorInvisible);
+    }
+    else
+    {
+        ALLEGRO_SYSTEM_MOUSE_CURSOR cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_DEFAULT;
+        switch (imgui_cursor)
+        {
+        case ImGuiMouseCursor_TextInput:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_EDIT; break;
+        case ImGuiMouseCursor_ResizeAll:    cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_MOVE; break;
+        case ImGuiMouseCursor_ResizeNS:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_N; break;
+        case ImGuiMouseCursor_ResizeEW:     cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_E; break;
+        case ImGuiMouseCursor_ResizeNESW:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NE; break;
+        case ImGuiMouseCursor_ResizeNWSE:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_RESIZE_NW; break;
+        case ImGuiMouseCursor_NotAllowed:   cursor_id = ALLEGRO_SYSTEM_MOUSE_CURSOR_UNAVAILABLE; break;
+        }
+        al_set_system_mouse_cursor(bd->Display, cursor_id);
+    }
+}
+
+void ImGui_ImplAllegro5_NewFrame()
+{
+    ImGui_ImplAllegro5_Data* bd = ImGui_ImplAllegro5_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplAllegro5_Init()?");
+
+    if (!bd->Texture)
+        ImGui_ImplAllegro5_CreateDeviceObjects();
+
+    ImGuiIO& io = ImGui::GetIO();
+
+    // Setup display size (every frame to accommodate for window resizing)
+    int w, h;
+    w = al_get_display_width(bd->Display);
+    h = al_get_display_height(bd->Display);
+    io.DisplaySize = ImVec2((float)w, (float)h);
+
+    // Setup time step
+    double current_time = al_get_time();
+    io.DeltaTime = bd->Time > 0.0 ? (float)(current_time - bd->Time) : (float)(1.0f / 60.0f);
+    bd->Time = current_time;
+
+    // Setup mouse cursor shape
+    ImGui_ImplAllegro5_UpdateMouseCursor();
+}

extern/imgui_patched/backends/imgui_impl_allegro5.h

@@ -0,0 +1,32 @@
+// dear imgui: Renderer + Platform Backend for Allegro 5
+// (Info: Allegro 5 is a cross-platform general purpose library for handling windows, inputs, graphics, etc.)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ALLEGRO_BITMAP*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy ALLEGRO_KEY_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+//  [X] Platform: Clipboard support (from Allegro 5.1.12)
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+// Issues:
+//  [ ] Renderer: The renderer is suboptimal as we need to unindex our buffers and convert vertices manually.
+//  [ ] Platform: Missing gamepad support.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct ALLEGRO_DISPLAY;
+union ALLEGRO_EVENT;
+
+IMGUI_IMPL_API bool     ImGui_ImplAllegro5_Init(ALLEGRO_DISPLAY* display);
+IMGUI_IMPL_API void     ImGui_ImplAllegro5_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplAllegro5_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplAllegro5_RenderDrawData(ImDrawData* draw_data);
+IMGUI_IMPL_API bool     ImGui_ImplAllegro5_ProcessEvent(ALLEGRO_EVENT* event);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API bool     ImGui_ImplAllegro5_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplAllegro5_InvalidateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_android.cpp

@@ -0,0 +1,276 @@
+// dear imgui: Platform Binding for Android native app
+// This needs to be used along with the OpenGL 3 Renderer (imgui_impl_opengl3)
+
+// Implemented features:
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy AKEYCODE_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+// Missing features:
+//  [ ] Platform: Clipboard support.
+//  [ ] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [ ] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: Check if this is even possible with Android.
+// Important:
+//  - Consider using SDL or GLFW backend on Android, which will be more full-featured than this.
+//  - FIXME: On-screen keyboard currently needs to be enabled by the application (see examples/ and issue #3446)
+//  - FIXME: Unicode character inputs needs to be passed by Dear ImGui by the application (see examples/ and issue #3446)
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago)with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
+//  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).
+//  2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range.
+//  2021-03-04: Initial version.
+
+#include "imgui.h"
+#include "imgui_impl_android.h"
+#include <time.h>
+#include <android/native_window.h>
+#include <android/input.h>
+#include <android/keycodes.h>
+#include <android/log.h>
+
+// Android data
+static double                                   g_Time = 0.0;
+static ANativeWindow*                           g_Window;
+static char                                     g_LogTag[] = "ImGuiExample";
+
+static ImGuiKey ImGui_ImplAndroid_KeyCodeToImGuiKey(int32_t key_code)
+{
+    switch (key_code)
+    {
+        case AKEYCODE_TAB:                  return ImGuiKey_Tab;
+        case AKEYCODE_DPAD_LEFT:            return ImGuiKey_LeftArrow;
+        case AKEYCODE_DPAD_RIGHT:           return ImGuiKey_RightArrow;
+        case AKEYCODE_DPAD_UP:              return ImGuiKey_UpArrow;
+        case AKEYCODE_DPAD_DOWN:            return ImGuiKey_DownArrow;
+        case AKEYCODE_PAGE_UP:              return ImGuiKey_PageUp;
+        case AKEYCODE_PAGE_DOWN:            return ImGuiKey_PageDown;
+        case AKEYCODE_MOVE_HOME:            return ImGuiKey_Home;
+        case AKEYCODE_MOVE_END:             return ImGuiKey_End;
+        case AKEYCODE_INSERT:               return ImGuiKey_Insert;
+        case AKEYCODE_FORWARD_DEL:          return ImGuiKey_Delete;
+        case AKEYCODE_DEL:                  return ImGuiKey_Backspace;
+        case AKEYCODE_SPACE:                return ImGuiKey_Space;
+        case AKEYCODE_ENTER:                return ImGuiKey_Enter;
+        case AKEYCODE_ESCAPE:               return ImGuiKey_Escape;
+        case AKEYCODE_APOSTROPHE:           return ImGuiKey_Apostrophe;
+        case AKEYCODE_COMMA:                return ImGuiKey_Comma;
+        case AKEYCODE_MINUS:                return ImGuiKey_Minus;
+        case AKEYCODE_PERIOD:               return ImGuiKey_Period;
+        case AKEYCODE_SLASH:                return ImGuiKey_Slash;
+        case AKEYCODE_SEMICOLON:            return ImGuiKey_Semicolon;
+        case AKEYCODE_EQUALS:               return ImGuiKey_Equal;
+        case AKEYCODE_LEFT_BRACKET:         return ImGuiKey_LeftBracket;
+        case AKEYCODE_BACKSLASH:            return ImGuiKey_Backslash;
+        case AKEYCODE_RIGHT_BRACKET:        return ImGuiKey_RightBracket;
+        case AKEYCODE_GRAVE:                return ImGuiKey_GraveAccent;
+        case AKEYCODE_CAPS_LOCK:            return ImGuiKey_CapsLock;
+        case AKEYCODE_SCROLL_LOCK:          return ImGuiKey_ScrollLock;
+        case AKEYCODE_NUM_LOCK:             return ImGuiKey_NumLock;
+        case AKEYCODE_SYSRQ:                return ImGuiKey_PrintScreen;
+        case AKEYCODE_BREAK:                return ImGuiKey_Pause;
+        case AKEYCODE_NUMPAD_0:             return ImGuiKey_Keypad0;
+        case AKEYCODE_NUMPAD_1:             return ImGuiKey_Keypad1;
+        case AKEYCODE_NUMPAD_2:             return ImGuiKey_Keypad2;
+        case AKEYCODE_NUMPAD_3:             return ImGuiKey_Keypad3;
+        case AKEYCODE_NUMPAD_4:             return ImGuiKey_Keypad4;
+        case AKEYCODE_NUMPAD_5:             return ImGuiKey_Keypad5;
+        case AKEYCODE_NUMPAD_6:             return ImGuiKey_Keypad6;
+        case AKEYCODE_NUMPAD_7:             return ImGuiKey_Keypad7;
+        case AKEYCODE_NUMPAD_8:             return ImGuiKey_Keypad8;
+        case AKEYCODE_NUMPAD_9:             return ImGuiKey_Keypad9;
+        case AKEYCODE_NUMPAD_DOT:           return ImGuiKey_KeypadDecimal;
+        case AKEYCODE_NUMPAD_DIVIDE:        return ImGuiKey_KeypadDivide;
+        case AKEYCODE_NUMPAD_MULTIPLY:      return ImGuiKey_KeypadMultiply;
+        case AKEYCODE_NUMPAD_SUBTRACT:      return ImGuiKey_KeypadSubtract;
+        case AKEYCODE_NUMPAD_ADD:           return ImGuiKey_KeypadAdd;
+        case AKEYCODE_NUMPAD_ENTER:         return ImGuiKey_KeypadEnter;
+        case AKEYCODE_NUMPAD_EQUALS:        return ImGuiKey_KeypadEqual;
+        case AKEYCODE_CTRL_LEFT:            return ImGuiKey_LeftCtrl;
+        case AKEYCODE_SHIFT_LEFT:           return ImGuiKey_LeftShift;
+        case AKEYCODE_ALT_LEFT:             return ImGuiKey_LeftAlt;
+        case AKEYCODE_META_LEFT:            return ImGuiKey_LeftSuper;
+        case AKEYCODE_CTRL_RIGHT:           return ImGuiKey_RightCtrl;
+        case AKEYCODE_SHIFT_RIGHT:          return ImGuiKey_RightShift;
+        case AKEYCODE_ALT_RIGHT:            return ImGuiKey_RightAlt;
+        case AKEYCODE_META_RIGHT:           return ImGuiKey_RightSuper;
+        case AKEYCODE_MENU:                 return ImGuiKey_Menu;
+        case AKEYCODE_0:                    return ImGuiKey_0;
+        case AKEYCODE_1:                    return ImGuiKey_1;
+        case AKEYCODE_2:                    return ImGuiKey_2;
+        case AKEYCODE_3:                    return ImGuiKey_3;
+        case AKEYCODE_4:                    return ImGuiKey_4;
+        case AKEYCODE_5:                    return ImGuiKey_5;
+        case AKEYCODE_6:                    return ImGuiKey_6;
+        case AKEYCODE_7:                    return ImGuiKey_7;
+        case AKEYCODE_8:                    return ImGuiKey_8;
+        case AKEYCODE_9:                    return ImGuiKey_9;
+        case AKEYCODE_A:                    return ImGuiKey_A;
+        case AKEYCODE_B:                    return ImGuiKey_B;
+        case AKEYCODE_C:                    return ImGuiKey_C;
+        case AKEYCODE_D:                    return ImGuiKey_D;
+        case AKEYCODE_E:                    return ImGuiKey_E;
+        case AKEYCODE_F:                    return ImGuiKey_F;
+        case AKEYCODE_G:                    return ImGuiKey_G;
+        case AKEYCODE_H:                    return ImGuiKey_H;
+        case AKEYCODE_I:                    return ImGuiKey_I;
+        case AKEYCODE_J:                    return ImGuiKey_J;
+        case AKEYCODE_K:                    return ImGuiKey_K;
+        case AKEYCODE_L:                    return ImGuiKey_L;
+        case AKEYCODE_M:                    return ImGuiKey_M;
+        case AKEYCODE_N:                    return ImGuiKey_N;
+        case AKEYCODE_O:                    return ImGuiKey_O;
+        case AKEYCODE_P:                    return ImGuiKey_P;
+        case AKEYCODE_Q:                    return ImGuiKey_Q;
+        case AKEYCODE_R:                    return ImGuiKey_R;
+        case AKEYCODE_S:                    return ImGuiKey_S;
+        case AKEYCODE_T:                    return ImGuiKey_T;
+        case AKEYCODE_U:                    return ImGuiKey_U;
+        case AKEYCODE_V:                    return ImGuiKey_V;
+        case AKEYCODE_W:                    return ImGuiKey_W;
+        case AKEYCODE_X:                    return ImGuiKey_X;
+        case AKEYCODE_Y:                    return ImGuiKey_Y;
+        case AKEYCODE_Z:                    return ImGuiKey_Z;
+        case AKEYCODE_F1:                   return ImGuiKey_F1;
+        case AKEYCODE_F2:                   return ImGuiKey_F2;
+        case AKEYCODE_F3:                   return ImGuiKey_F3;
+        case AKEYCODE_F4:                   return ImGuiKey_F4;
+        case AKEYCODE_F5:                   return ImGuiKey_F5;
+        case AKEYCODE_F6:                   return ImGuiKey_F6;
+        case AKEYCODE_F7:                   return ImGuiKey_F7;
+        case AKEYCODE_F8:                   return ImGuiKey_F8;
+        case AKEYCODE_F9:                   return ImGuiKey_F9;
+        case AKEYCODE_F10:                  return ImGuiKey_F10;
+        case AKEYCODE_F11:                  return ImGuiKey_F11;
+        case AKEYCODE_F12:                  return ImGuiKey_F12;
+        default:                            return ImGuiKey_None;
+    }
+}
+
+int32_t ImGui_ImplAndroid_HandleInputEvent(AInputEvent* input_event)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    int32_t event_type = AInputEvent_getType(input_event);
+    switch (event_type)
+    {
+    case AINPUT_EVENT_TYPE_KEY:
+    {
+        int32_t event_key_code = AKeyEvent_getKeyCode(input_event);
+        int32_t event_scan_code = AKeyEvent_getScanCode(input_event);
+        int32_t event_action = AKeyEvent_getAction(input_event);
+        int32_t event_meta_state = AKeyEvent_getMetaState(input_event);
+
+        io.AddKeyEvent(ImGuiKey_ModCtrl,  (event_meta_state & AMETA_CTRL_ON)  != 0);
+        io.AddKeyEvent(ImGuiKey_ModShift, (event_meta_state & AMETA_SHIFT_ON) != 0);
+        io.AddKeyEvent(ImGuiKey_ModAlt,   (event_meta_state & AMETA_ALT_ON)   != 0);
+        io.AddKeyEvent(ImGuiKey_ModSuper, (event_meta_state & AMETA_META_ON)  != 0);
+
+        switch (event_action)
+        {
+        // FIXME: AKEY_EVENT_ACTION_DOWN and AKEY_EVENT_ACTION_UP occur at once as soon as a touch pointer
+        // goes up from a key. We use a simple key event queue/ and process one event per key per frame in
+        // ImGui_ImplAndroid_NewFrame()...or consider using IO queue, if suitable: https://github.com/ocornut/imgui/issues/2787
+        case AKEY_EVENT_ACTION_DOWN:
+        case AKEY_EVENT_ACTION_UP:
+        {
+            ImGuiKey key = ImGui_ImplAndroid_KeyCodeToImGuiKey(event_key_code);
+            if (key != ImGuiKey_None && (event_action == AKEY_EVENT_ACTION_DOWN || event_action == AKEY_EVENT_ACTION_UP))
+            {
+                io.AddKeyEvent(key, event_action == AKEY_EVENT_ACTION_DOWN);
+                io.SetKeyEventNativeData(key, event_key_code, event_scan_code);
+            }
+
+            break;
+        }
+        default:
+            break;
+        }
+        break;
+    }
+    case AINPUT_EVENT_TYPE_MOTION:
+    {
+        int32_t event_action = AMotionEvent_getAction(input_event);
+        int32_t event_pointer_index = (event_action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK) >> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
+        event_action &= AMOTION_EVENT_ACTION_MASK;
+        switch (event_action)
+        {
+        case AMOTION_EVENT_ACTION_DOWN:
+        case AMOTION_EVENT_ACTION_UP:
+            // Physical mouse buttons (and probably other physical devices) also invoke the actions AMOTION_EVENT_ACTION_DOWN/_UP,
+            // but we have to process them separately to identify the actual button pressed. This is done below via
+            // AMOTION_EVENT_ACTION_BUTTON_PRESS/_RELEASE. Here, we only process "FINGER" input (and "UNKNOWN", as a fallback).
+            if((AMotionEvent_getToolType(input_event, event_pointer_index) == AMOTION_EVENT_TOOL_TYPE_FINGER)
+            || (AMotionEvent_getToolType(input_event, event_pointer_index) == AMOTION_EVENT_TOOL_TYPE_UNKNOWN))
+            {
+                io.AddMousePosEvent(AMotionEvent_getX(input_event, event_pointer_index), AMotionEvent_getY(input_event, event_pointer_index));
+                io.AddMouseButtonEvent(0, event_action == AMOTION_EVENT_ACTION_DOWN);
+            }
+            break;
+        case AMOTION_EVENT_ACTION_BUTTON_PRESS:
+        case AMOTION_EVENT_ACTION_BUTTON_RELEASE:
+            {
+                int32_t button_state = AMotionEvent_getButtonState(input_event);
+                io.AddMouseButtonEvent(0, (button_state & AMOTION_EVENT_BUTTON_PRIMARY) != 0);
+                io.AddMouseButtonEvent(1, (button_state & AMOTION_EVENT_BUTTON_SECONDARY) != 0);
+                io.AddMouseButtonEvent(2, (button_state & AMOTION_EVENT_BUTTON_TERTIARY) != 0);
+            }
+            break;
+        case AMOTION_EVENT_ACTION_HOVER_MOVE: // Hovering: Tool moves while NOT pressed (such as a physical mouse)
+        case AMOTION_EVENT_ACTION_MOVE:       // Touch pointer moves while DOWN
+            io.AddMousePosEvent(AMotionEvent_getX(input_event, event_pointer_index), AMotionEvent_getY(input_event, event_pointer_index));
+            break;
+        case AMOTION_EVENT_ACTION_SCROLL:
+            io.AddMouseWheelEvent(AMotionEvent_getAxisValue(input_event, AMOTION_EVENT_AXIS_HSCROLL, event_pointer_index), AMotionEvent_getAxisValue(input_event, AMOTION_EVENT_AXIS_VSCROLL, event_pointer_index));
+            break;
+        default:
+            break;
+        }
+    }
+        return 1;
+    default:
+        break;
+    }
+
+    return 0;
+}
+
+bool ImGui_ImplAndroid_Init(ANativeWindow* window)
+{
+    g_Window = window;
+    g_Time = 0.0;
+
+    // Setup backend capabilities flags
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendPlatformName = "imgui_impl_android";
+
+    return true;
+}
+
+void ImGui_ImplAndroid_Shutdown()
+{
+}
+
+void ImGui_ImplAndroid_NewFrame()
+{
+    ImGuiIO& io = ImGui::GetIO();
+
+    // Setup display size (every frame to accommodate for window resizing)
+    int32_t window_width = ANativeWindow_getWidth(g_Window);
+    int32_t window_height = ANativeWindow_getHeight(g_Window);
+    int display_width = window_width;
+    int display_height = window_height;
+
+    io.DisplaySize = ImVec2((float)window_width, (float)window_height);
+    if (window_width > 0 && window_height > 0)
+        io.DisplayFramebufferScale = ImVec2((float)display_width / window_width, (float)display_height / window_height);
+
+    // Setup time step
+    struct timespec current_timespec;
+    clock_gettime(CLOCK_MONOTONIC, &current_timespec);
+    double current_time = (double)(current_timespec.tv_sec) + (current_timespec.tv_nsec / 1000000000.0);
+    io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f);
+    g_Time = current_time;
+}

extern/imgui_patched/backends/imgui_impl_android.h

@@ -0,0 +1,28 @@
+// dear imgui: Platform Binding for Android native app
+// This needs to be used along with the OpenGL 3 Renderer (imgui_impl_opengl3)
+
+// Implemented features:
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy AKEYCODE_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+// Missing features:
+//  [ ] Platform: Clipboard support.
+//  [ ] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [ ] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: Check if this is even possible with Android.
+// Important:
+//  - Consider using SDL or GLFW backend on Android, which will be more full-featured than this.
+//  - FIXME: On-screen keyboard currently needs to be enabled by the application (see examples/ and issue #3446)
+//  - FIXME: Unicode character inputs needs to be passed by Dear ImGui by the application (see examples/ and issue #3446)
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+
+struct ANativeWindow;
+struct AInputEvent;
+
+IMGUI_IMPL_API bool     ImGui_ImplAndroid_Init(ANativeWindow* window);
+IMGUI_IMPL_API int32_t  ImGui_ImplAndroid_HandleInputEvent(AInputEvent* input_event);
+IMGUI_IMPL_API void     ImGui_ImplAndroid_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplAndroid_NewFrame();

extern/imgui_patched/backends/imgui_impl_dx10.cpp

@@ -0,0 +1,713 @@
+// dear imgui: Renderer Backend for DirectX10
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-05-19: DirectX10: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-02-18: DirectX10: Change blending equation to preserve alpha in output buffer.
+//  2019-07-21: DirectX10: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData().
+//  2019-05-29: DirectX10: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: DirectX10: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-07-13: DirectX10: Fixed unreleased resources in Init and Shutdown functions.
+//  2018-06-08: Misc: Extracted imgui_impl_dx10.cpp/.h away from the old combined DX10+Win32 example.
+//  2018-06-08: DirectX10: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-04-09: Misc: Fixed erroneous call to io.Fonts->ClearInputData() + ClearTexData() that was left in DX10 example but removed in 1.47 (Nov 2015) on other backends.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX10_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2016-05-07: DirectX10: Disabling depth-write.
+
+#include "imgui.h"
+#include "imgui_impl_dx10.h"
+
+// DirectX
+#include <stdio.h>
+#include <d3d10_1.h>
+#include <d3d10.h>
+#include <d3dcompiler.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+#endif
+
+// DirectX data
+struct ImGui_ImplDX10_Data
+{
+    ID3D10Device*               pd3dDevice;
+    IDXGIFactory*               pFactory;
+    ID3D10Buffer*               pVB;
+    ID3D10Buffer*               pIB;
+    ID3D10VertexShader*         pVertexShader;
+    ID3D10InputLayout*          pInputLayout;
+    ID3D10Buffer*               pVertexConstantBuffer;
+    ID3D10PixelShader*          pPixelShader;
+    ID3D10SamplerState*         pFontSampler;
+    ID3D10ShaderResourceView*   pFontTextureView;
+    ID3D10RasterizerState*      pRasterizerState;
+    ID3D10BlendState*           pBlendState;
+    ID3D10DepthStencilState*    pDepthStencilState;
+    int                         VertexBufferSize;
+    int                         IndexBufferSize;
+
+    ImGui_ImplDX10_Data()       { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
+};
+
+struct VERTEX_CONSTANT_BUFFER
+{
+    float   mvp[4][4];
+};
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplDX10_Data* ImGui_ImplDX10_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX10_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Forward Declarations
+static void ImGui_ImplDX10_InitPlatformInterface();
+static void ImGui_ImplDX10_ShutdownPlatformInterface();
+
+// Functions
+static void ImGui_ImplDX10_SetupRenderState(ImDrawData* draw_data, ID3D10Device* ctx)
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+
+    // Setup viewport
+    D3D10_VIEWPORT vp;
+    memset(&vp, 0, sizeof(D3D10_VIEWPORT));
+    vp.Width = (UINT)draw_data->DisplaySize.x;
+    vp.Height = (UINT)draw_data->DisplaySize.y;
+    vp.MinDepth = 0.0f;
+    vp.MaxDepth = 1.0f;
+    vp.TopLeftX = vp.TopLeftY = 0;
+    ctx->RSSetViewports(1, &vp);
+
+    // Bind shader and vertex buffers
+    unsigned int stride = sizeof(ImDrawVert);
+    unsigned int offset = 0;
+    ctx->IASetInputLayout(bd->pInputLayout);
+    ctx->IASetVertexBuffers(0, 1, &bd->pVB, &stride, &offset);
+    ctx->IASetIndexBuffer(bd->pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
+    ctx->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+    ctx->VSSetShader(bd->pVertexShader);
+    ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer);
+    ctx->PSSetShader(bd->pPixelShader);
+    ctx->PSSetSamplers(0, 1, &bd->pFontSampler);
+    ctx->GSSetShader(NULL);
+
+    // Setup render state
+    const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
+    ctx->OMSetBlendState(bd->pBlendState, blend_factor, 0xffffffff);
+    ctx->OMSetDepthStencilState(bd->pDepthStencilState, 0);
+    ctx->RSSetState(bd->pRasterizerState);
+}
+
+// Render function
+void ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    ID3D10Device* ctx = bd->pd3dDevice;
+
+    // Create and grow vertex/index buffers if needed
+    if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
+    {
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
+        D3D10_BUFFER_DESC desc;
+        memset(&desc, 0, sizeof(D3D10_BUFFER_DESC));
+        desc.Usage = D3D10_USAGE_DYNAMIC;
+        desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert);
+        desc.BindFlags = D3D10_BIND_VERTEX_BUFFER;
+        desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
+        desc.MiscFlags = 0;
+        if (ctx->CreateBuffer(&desc, NULL, &bd->pVB) < 0)
+            return;
+    }
+
+    if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
+    {
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
+        D3D10_BUFFER_DESC desc;
+        memset(&desc, 0, sizeof(D3D10_BUFFER_DESC));
+        desc.Usage = D3D10_USAGE_DYNAMIC;
+        desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
+        desc.BindFlags = D3D10_BIND_INDEX_BUFFER;
+        desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
+        if (ctx->CreateBuffer(&desc, NULL, &bd->pIB) < 0)
+            return;
+    }
+
+    // Copy and convert all vertices into a single contiguous buffer
+    ImDrawVert* vtx_dst = NULL;
+    ImDrawIdx* idx_dst = NULL;
+    bd->pVB->Map(D3D10_MAP_WRITE_DISCARD, 0, (void**)&vtx_dst);
+    bd->pIB->Map(D3D10_MAP_WRITE_DISCARD, 0, (void**)&idx_dst);
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
+        memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+        vtx_dst += cmd_list->VtxBuffer.Size;
+        idx_dst += cmd_list->IdxBuffer.Size;
+    }
+    bd->pVB->Unmap();
+    bd->pIB->Unmap();
+
+    // Setup orthographic projection matrix into our constant buffer
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    {
+        void* mapped_resource;
+        if (bd->pVertexConstantBuffer->Map(D3D10_MAP_WRITE_DISCARD, 0, &mapped_resource) != S_OK)
+            return;
+        VERTEX_CONSTANT_BUFFER* constant_buffer = (VERTEX_CONSTANT_BUFFER*)mapped_resource;
+        float L = draw_data->DisplayPos.x;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+        float T = draw_data->DisplayPos.y;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+        float mvp[4][4] =
+        {
+            { 2.0f/(R-L),   0.0f,           0.0f,       0.0f },
+            { 0.0f,         2.0f/(T-B),     0.0f,       0.0f },
+            { 0.0f,         0.0f,           0.5f,       0.0f },
+            { (R+L)/(L-R),  (T+B)/(B-T),    0.5f,       1.0f },
+        };
+        memcpy(&constant_buffer->mvp, mvp, sizeof(mvp));
+        bd->pVertexConstantBuffer->Unmap();
+    }
+
+    // Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!)
+    struct BACKUP_DX10_STATE
+    {
+        UINT                        ScissorRectsCount, ViewportsCount;
+        D3D10_RECT                  ScissorRects[D3D10_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
+        D3D10_VIEWPORT              Viewports[D3D10_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
+        ID3D10RasterizerState*      RS;
+        ID3D10BlendState*           BlendState;
+        FLOAT                       BlendFactor[4];
+        UINT                        SampleMask;
+        UINT                        StencilRef;
+        ID3D10DepthStencilState*    DepthStencilState;
+        ID3D10ShaderResourceView*   PSShaderResource;
+        ID3D10SamplerState*         PSSampler;
+        ID3D10PixelShader*          PS;
+        ID3D10VertexShader*         VS;
+        ID3D10GeometryShader*       GS;
+        D3D10_PRIMITIVE_TOPOLOGY    PrimitiveTopology;
+        ID3D10Buffer*               IndexBuffer, *VertexBuffer, *VSConstantBuffer;
+        UINT                        IndexBufferOffset, VertexBufferStride, VertexBufferOffset;
+        DXGI_FORMAT                 IndexBufferFormat;
+        ID3D10InputLayout*          InputLayout;
+    };
+    BACKUP_DX10_STATE old = {};
+    old.ScissorRectsCount = old.ViewportsCount = D3D10_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
+    ctx->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects);
+    ctx->RSGetViewports(&old.ViewportsCount, old.Viewports);
+    ctx->RSGetState(&old.RS);
+    ctx->OMGetBlendState(&old.BlendState, old.BlendFactor, &old.SampleMask);
+    ctx->OMGetDepthStencilState(&old.DepthStencilState, &old.StencilRef);
+    ctx->PSGetShaderResources(0, 1, &old.PSShaderResource);
+    ctx->PSGetSamplers(0, 1, &old.PSSampler);
+    ctx->PSGetShader(&old.PS);
+    ctx->VSGetShader(&old.VS);
+    ctx->VSGetConstantBuffers(0, 1, &old.VSConstantBuffer);
+    ctx->GSGetShader(&old.GS);
+    ctx->IAGetPrimitiveTopology(&old.PrimitiveTopology);
+    ctx->IAGetIndexBuffer(&old.IndexBuffer, &old.IndexBufferFormat, &old.IndexBufferOffset);
+    ctx->IAGetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset);
+    ctx->IAGetInputLayout(&old.InputLayout);
+
+    // Setup desired DX state
+    ImGui_ImplDX10_SetupRenderState(draw_data, ctx);
+
+    // Render command lists
+    // (Because we merged all buffers into a single one, we maintain our own offset into them)
+    int global_vtx_offset = 0;
+    int global_idx_offset = 0;
+    ImVec2 clip_off = draw_data->DisplayPos;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplDX10_SetupRenderState(draw_data, ctx);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
+                ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle
+                const D3D10_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y };
+                ctx->RSSetScissorRects(1, &r);
+
+                // Bind texture, Draw
+                ID3D10ShaderResourceView* texture_srv = (ID3D10ShaderResourceView*)pcmd->GetTexID();
+                ctx->PSSetShaderResources(0, 1, &texture_srv);
+                ctx->DrawIndexed(pcmd->ElemCount, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset);
+            }
+        }
+        global_idx_offset += cmd_list->IdxBuffer.Size;
+        global_vtx_offset += cmd_list->VtxBuffer.Size;
+    }
+
+    // Restore modified DX state
+    ctx->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects);
+    ctx->RSSetViewports(old.ViewportsCount, old.Viewports);
+    ctx->RSSetState(old.RS); if (old.RS) old.RS->Release();
+    ctx->OMSetBlendState(old.BlendState, old.BlendFactor, old.SampleMask); if (old.BlendState) old.BlendState->Release();
+    ctx->OMSetDepthStencilState(old.DepthStencilState, old.StencilRef); if (old.DepthStencilState) old.DepthStencilState->Release();
+    ctx->PSSetShaderResources(0, 1, &old.PSShaderResource); if (old.PSShaderResource) old.PSShaderResource->Release();
+    ctx->PSSetSamplers(0, 1, &old.PSSampler); if (old.PSSampler) old.PSSampler->Release();
+    ctx->PSSetShader(old.PS); if (old.PS) old.PS->Release();
+    ctx->VSSetShader(old.VS); if (old.VS) old.VS->Release();
+    ctx->GSSetShader(old.GS); if (old.GS) old.GS->Release();
+    ctx->VSSetConstantBuffers(0, 1, &old.VSConstantBuffer); if (old.VSConstantBuffer) old.VSConstantBuffer->Release();
+    ctx->IASetPrimitiveTopology(old.PrimitiveTopology);
+    ctx->IASetIndexBuffer(old.IndexBuffer, old.IndexBufferFormat, old.IndexBufferOffset); if (old.IndexBuffer) old.IndexBuffer->Release();
+    ctx->IASetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); if (old.VertexBuffer) old.VertexBuffer->Release();
+    ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
+}
+
+static void ImGui_ImplDX10_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    ImGuiIO& io = ImGui::GetIO();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+
+    // Upload texture to graphics system
+    {
+        D3D10_TEXTURE2D_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.Width = width;
+        desc.Height = height;
+        desc.MipLevels = 1;
+        desc.ArraySize = 1;
+        desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+        desc.SampleDesc.Count = 1;
+        desc.Usage = D3D10_USAGE_DEFAULT;
+        desc.BindFlags = D3D10_BIND_SHADER_RESOURCE;
+        desc.CPUAccessFlags = 0;
+
+        ID3D10Texture2D* pTexture = NULL;
+        D3D10_SUBRESOURCE_DATA subResource;
+        subResource.pSysMem = pixels;
+        subResource.SysMemPitch = desc.Width * 4;
+        subResource.SysMemSlicePitch = 0;
+        bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);
+        IM_ASSERT(pTexture != NULL);
+
+        // Create texture view
+        D3D10_SHADER_RESOURCE_VIEW_DESC srv_desc;
+        ZeroMemory(&srv_desc, sizeof(srv_desc));
+        srv_desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+        srv_desc.ViewDimension = D3D10_SRV_DIMENSION_TEXTURE2D;
+        srv_desc.Texture2D.MipLevels = desc.MipLevels;
+        srv_desc.Texture2D.MostDetailedMip = 0;
+        bd->pd3dDevice->CreateShaderResourceView(pTexture, &srv_desc, &bd->pFontTextureView);
+        pTexture->Release();
+    }
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)bd->pFontTextureView);
+
+    // Create texture sampler
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    {
+        D3D10_SAMPLER_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.Filter = D3D10_FILTER_MIN_MAG_MIP_LINEAR;
+        desc.AddressU = D3D10_TEXTURE_ADDRESS_WRAP;
+        desc.AddressV = D3D10_TEXTURE_ADDRESS_WRAP;
+        desc.AddressW = D3D10_TEXTURE_ADDRESS_WRAP;
+        desc.MipLODBias = 0.f;
+        desc.ComparisonFunc = D3D10_COMPARISON_ALWAYS;
+        desc.MinLOD = 0.f;
+        desc.MaxLOD = 0.f;
+        bd->pd3dDevice->CreateSamplerState(&desc, &bd->pFontSampler);
+    }
+}
+
+bool    ImGui_ImplDX10_CreateDeviceObjects()
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    if (!bd->pd3dDevice)
+        return false;
+    if (bd->pFontSampler)
+        ImGui_ImplDX10_InvalidateDeviceObjects();
+
+    // By using D3DCompile() from <d3dcompiler.h> / d3dcompiler.lib, we introduce a dependency to a given version of d3dcompiler_XX.dll (see D3DCOMPILER_DLL_A)
+    // If you would like to use this DX10 sample code but remove this dependency you can:
+    //  1) compile once, save the compiled shader blobs into a file or source code and pass them to CreateVertexShader()/CreatePixelShader() [preferred solution]
+    //  2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
+    // See https://github.com/ocornut/imgui/pull/638 for sources and details.
+
+    // Create the vertex shader
+    {
+        static const char* vertexShader =
+            "cbuffer vertexBuffer : register(b0) \
+            {\
+              float4x4 ProjectionMatrix; \
+            };\
+            struct VS_INPUT\
+            {\
+              float2 pos : POSITION;\
+              float4 col : COLOR0;\
+              float2 uv  : TEXCOORD0;\
+            };\
+            \
+            struct PS_INPUT\
+            {\
+              float4 pos : SV_POSITION;\
+              float4 col : COLOR0;\
+              float2 uv  : TEXCOORD0;\
+            };\
+            \
+            PS_INPUT main(VS_INPUT input)\
+            {\
+              PS_INPUT output;\
+              output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\
+              output.col = input.col;\
+              output.uv  = input.uv;\
+              return output;\
+            }";
+
+        ID3DBlob* vertexShaderBlob;
+        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &vertexShaderBlob, NULL)))
+            return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
+        if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pVertexShader) != S_OK)
+        {
+            vertexShaderBlob->Release();
+            return false;
+        }
+
+        // Create the input layout
+        D3D10_INPUT_ELEMENT_DESC local_layout[] =
+        {
+            { "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (UINT)IM_OFFSETOF(ImDrawVert, pos), D3D10_INPUT_PER_VERTEX_DATA, 0 },
+            { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (UINT)IM_OFFSETOF(ImDrawVert, uv),  D3D10_INPUT_PER_VERTEX_DATA, 0 },
+            { "COLOR",    0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)IM_OFFSETOF(ImDrawVert, col), D3D10_INPUT_PER_VERTEX_DATA, 0 },
+        };
+        if (bd->pd3dDevice->CreateInputLayout(local_layout, 3, vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pInputLayout) != S_OK)
+        {
+            vertexShaderBlob->Release();
+            return false;
+        }
+        vertexShaderBlob->Release();
+
+        // Create the constant buffer
+        {
+            D3D10_BUFFER_DESC desc;
+            desc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER);
+            desc.Usage = D3D10_USAGE_DYNAMIC;
+            desc.BindFlags = D3D10_BIND_CONSTANT_BUFFER;
+            desc.CPUAccessFlags = D3D10_CPU_ACCESS_WRITE;
+            desc.MiscFlags = 0;
+            bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVertexConstantBuffer);
+        }
+    }
+
+    // Create the pixel shader
+    {
+        static const char* pixelShader =
+            "struct PS_INPUT\
+            {\
+            float4 pos : SV_POSITION;\
+            float4 col : COLOR0;\
+            float2 uv  : TEXCOORD0;\
+            };\
+            sampler sampler0;\
+            Texture2D texture0;\
+            \
+            float4 main(PS_INPUT input) : SV_Target\
+            {\
+            float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \
+            return out_col; \
+            }";
+
+        ID3DBlob* pixelShaderBlob;
+        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &pixelShaderBlob, NULL)))
+            return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
+        if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), &bd->pPixelShader) != S_OK)
+        {
+            pixelShaderBlob->Release();
+            return false;
+        }
+        pixelShaderBlob->Release();
+    }
+
+    // Create the blending setup
+    {
+        D3D10_BLEND_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.AlphaToCoverageEnable = false;
+        desc.BlendEnable[0] = true;
+        desc.SrcBlend = D3D10_BLEND_SRC_ALPHA;
+        desc.DestBlend = D3D10_BLEND_INV_SRC_ALPHA;
+        desc.BlendOp = D3D10_BLEND_OP_ADD;
+        desc.SrcBlendAlpha = D3D10_BLEND_ONE;
+        desc.DestBlendAlpha = D3D10_BLEND_INV_SRC_ALPHA;
+        desc.BlendOpAlpha = D3D10_BLEND_OP_ADD;
+        desc.RenderTargetWriteMask[0] = D3D10_COLOR_WRITE_ENABLE_ALL;
+        bd->pd3dDevice->CreateBlendState(&desc, &bd->pBlendState);
+    }
+
+    // Create the rasterizer state
+    {
+        D3D10_RASTERIZER_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.FillMode = D3D10_FILL_SOLID;
+        desc.CullMode = D3D10_CULL_NONE;
+        desc.ScissorEnable = true;
+        desc.DepthClipEnable = true;
+        bd->pd3dDevice->CreateRasterizerState(&desc, &bd->pRasterizerState);
+    }
+
+    // Create depth-stencil State
+    {
+        D3D10_DEPTH_STENCIL_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.DepthEnable = false;
+        desc.DepthWriteMask = D3D10_DEPTH_WRITE_MASK_ALL;
+        desc.DepthFunc = D3D10_COMPARISON_ALWAYS;
+        desc.StencilEnable = false;
+        desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D10_STENCIL_OP_KEEP;
+        desc.FrontFace.StencilFunc = D3D10_COMPARISON_ALWAYS;
+        desc.BackFace = desc.FrontFace;
+        bd->pd3dDevice->CreateDepthStencilState(&desc, &bd->pDepthStencilState);
+    }
+
+    ImGui_ImplDX10_CreateFontsTexture();
+
+    return true;
+}
+
+void    ImGui_ImplDX10_InvalidateDeviceObjects()
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    if (!bd->pd3dDevice)
+        return;
+
+    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = NULL; }
+    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = NULL; }
+    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = NULL; }
+    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = NULL; }
+    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = NULL; }
+    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = NULL; }
+    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = NULL; }
+    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = NULL; }
+    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = NULL; }
+    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = NULL; }
+}
+
+bool    ImGui_ImplDX10_Init(ID3D10Device* device)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplDX10_Data* bd = IM_NEW(ImGui_ImplDX10_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_dx10";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    // Get factory from device
+    IDXGIDevice* pDXGIDevice = NULL;
+    IDXGIAdapter* pDXGIAdapter = NULL;
+    IDXGIFactory* pFactory = NULL;
+    if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
+        if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
+            if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK)
+            {
+                bd->pd3dDevice = device;
+                bd->pFactory = pFactory;
+            }
+    if (pDXGIDevice) pDXGIDevice->Release();
+    if (pDXGIAdapter) pDXGIAdapter->Release();
+    bd->pd3dDevice->AddRef();
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplDX10_InitPlatformInterface();
+    return true;
+}
+
+void ImGui_ImplDX10_Shutdown()
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplDX10_ShutdownPlatformInterface();
+    ImGui_ImplDX10_InvalidateDeviceObjects();
+    if (bd->pFactory) { bd->pFactory->Release(); }
+    if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+void ImGui_ImplDX10_NewFrame()
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX10_Init()?");
+
+    if (!bd->pFontSampler)
+        ImGui_ImplDX10_CreateDeviceObjects();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
+struct ImGui_ImplDX10_ViewportData
+{
+    IDXGISwapChain*         SwapChain;
+    ID3D10RenderTargetView* RTView;
+
+    ImGui_ImplDX10_ViewportData()   { SwapChain = NULL; RTView = NULL; }
+    ~ImGui_ImplDX10_ViewportData()  { IM_ASSERT(SwapChain == NULL && RTView == NULL); }
+};
+
+static void ImGui_ImplDX10_CreateWindow(ImGuiViewport* viewport)
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    ImGui_ImplDX10_ViewportData* vd = IM_NEW(ImGui_ImplDX10_ViewportData)();
+    viewport->RendererUserData = vd;
+
+    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
+    // Some backends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
+    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
+    IM_ASSERT(hwnd != 0);
+
+    // Create swap chain
+    DXGI_SWAP_CHAIN_DESC sd;
+    ZeroMemory(&sd, sizeof(sd));
+    sd.BufferDesc.Width = (UINT)viewport->Size.x;
+    sd.BufferDesc.Height = (UINT)viewport->Size.y;
+    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    sd.SampleDesc.Count = 1;
+    sd.SampleDesc.Quality = 0;
+    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    sd.BufferCount = 1;
+    sd.OutputWindow = hwnd;
+    sd.Windowed = TRUE;
+    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
+    sd.Flags = 0;
+
+    IM_ASSERT(vd->SwapChain == NULL && vd->RTView == NULL);
+    bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
+
+    // Create the render target
+    if (vd->SwapChain)
+    {
+        ID3D10Texture2D* pBackBuffer;
+        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        pBackBuffer->Release();
+    }
+}
+
+static void ImGui_ImplDX10_DestroyWindow(ImGuiViewport* viewport)
+{
+    // The main viewport (owned by the application) will always have RendererUserData == NULL here since we didn't create the data for it.
+    if (ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData)
+    {
+        if (vd->SwapChain)
+            vd->SwapChain->Release();
+        vd->SwapChain = NULL;
+        if (vd->RTView)
+            vd->RTView->Release();
+        vd->RTView = NULL;
+        IM_DELETE(vd);
+    }
+    viewport->RendererUserData = NULL;
+}
+
+static void ImGui_ImplDX10_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
+    if (vd->RTView)
+    {
+        vd->RTView->Release();
+        vd->RTView = NULL;
+    }
+    if (vd->SwapChain)
+    {
+        ID3D10Texture2D* pBackBuffer = NULL;
+        vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
+        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
+        if (pBackBuffer == NULL) { fprintf(stderr, "ImGui_ImplDX10_SetWindowSize() failed creating buffers.\n"); return; }
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        pBackBuffer->Release();
+    }
+}
+
+static void ImGui_ImplDX10_RenderViewport(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX10_Data* bd = ImGui_ImplDX10_GetBackendData();
+    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
+    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+    bd->pd3dDevice->OMSetRenderTargets(1, &vd->RTView, NULL);
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+        bd->pd3dDevice->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
+    ImGui_ImplDX10_RenderDrawData(viewport->DrawData);
+}
+
+static void ImGui_ImplDX10_SwapBuffers(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX10_ViewportData* vd = (ImGui_ImplDX10_ViewportData*)viewport->RendererUserData;
+    vd->SwapChain->Present(0, 0); // Present without vsync
+}
+
+void ImGui_ImplDX10_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_CreateWindow = ImGui_ImplDX10_CreateWindow;
+    platform_io.Renderer_DestroyWindow = ImGui_ImplDX10_DestroyWindow;
+    platform_io.Renderer_SetWindowSize = ImGui_ImplDX10_SetWindowSize;
+    platform_io.Renderer_RenderWindow = ImGui_ImplDX10_RenderViewport;
+    platform_io.Renderer_SwapBuffers = ImGui_ImplDX10_SwapBuffers;
+}
+
+void ImGui_ImplDX10_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}
+

extern/imgui_patched/backends/imgui_impl_dx10.h

@@ -0,0 +1,26 @@
+// dear imgui: Renderer Backend for DirectX10
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ID3D10ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct ID3D10Device;
+
+IMGUI_IMPL_API bool     ImGui_ImplDX10_Init(ID3D10Device* device);
+IMGUI_IMPL_API void     ImGui_ImplDX10_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplDX10_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplDX10_RenderDrawData(ImDrawData* draw_data);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API void     ImGui_ImplDX10_InvalidateDeviceObjects();
+IMGUI_IMPL_API bool     ImGui_ImplDX10_CreateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_dx11.cpp

@@ -0,0 +1,729 @@
+// dear imgui: Renderer Backend for DirectX11
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-05-19: DirectX11: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-02-18: DirectX11: Change blending equation to preserve alpha in output buffer.
+//  2019-08-01: DirectX11: Fixed code querying the Geometry Shader state (would generally error with Debug layer enabled).
+//  2019-07-21: DirectX11: Backup, clear and restore Geometry Shader is any is bound when calling ImGui_ImplDX10_RenderDrawData. Clearing Hull/Domain/Compute shaders without backup/restore.
+//  2019-05-29: DirectX11: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: DirectX11: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2018-12-03: Misc: Added #pragma comment statement to automatically link with d3dcompiler.lib when using D3DCompile().
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-08-01: DirectX11: Querying for IDXGIFactory instead of IDXGIFactory1 to increase compatibility.
+//  2018-07-13: DirectX11: Fixed unreleased resources in Init and Shutdown functions.
+//  2018-06-08: Misc: Extracted imgui_impl_dx11.cpp/.h away from the old combined DX11+Win32 example.
+//  2018-06-08: DirectX11: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX11_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2016-05-07: DirectX11: Disabling depth-write.
+
+#include "imgui.h"
+#include "imgui_impl_dx11.h"
+
+// DirectX
+#include <stdio.h>
+#include <d3d11.h>
+#include <d3dcompiler.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "d3dcompiler") // Automatically link with d3dcompiler.lib as we are using D3DCompile() below.
+#endif
+
+// DirectX11 data
+struct ImGui_ImplDX11_Data
+{
+    ID3D11Device*               pd3dDevice;
+    ID3D11DeviceContext*        pd3dDeviceContext;
+    IDXGIFactory*               pFactory;
+    ID3D11Buffer*               pVB;
+    ID3D11Buffer*               pIB;
+    ID3D11VertexShader*         pVertexShader;
+    ID3D11InputLayout*          pInputLayout;
+    ID3D11Buffer*               pVertexConstantBuffer;
+    ID3D11PixelShader*          pPixelShader;
+    ID3D11SamplerState*         pFontSampler;
+    ID3D11ShaderResourceView*   pFontTextureView;
+    ID3D11RasterizerState*      pRasterizerState;
+    ID3D11BlendState*           pBlendState;
+    ID3D11DepthStencilState*    pDepthStencilState;
+    int                         VertexBufferSize;
+    int                         IndexBufferSize;
+
+    ImGui_ImplDX11_Data()       { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
+};
+
+struct VERTEX_CONSTANT_BUFFER
+{
+    float   mvp[4][4];
+};
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplDX11_Data* ImGui_ImplDX11_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX11_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Forward Declarations
+static void ImGui_ImplDX11_InitPlatformInterface();
+static void ImGui_ImplDX11_ShutdownPlatformInterface();
+
+// Functions
+static void ImGui_ImplDX11_SetupRenderState(ImDrawData* draw_data, ID3D11DeviceContext* ctx)
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+
+    // Setup viewport
+    D3D11_VIEWPORT vp;
+    memset(&vp, 0, sizeof(D3D11_VIEWPORT));
+    vp.Width = draw_data->DisplaySize.x;
+    vp.Height = draw_data->DisplaySize.y;
+    vp.MinDepth = 0.0f;
+    vp.MaxDepth = 1.0f;
+    vp.TopLeftX = vp.TopLeftY = 0;
+    ctx->RSSetViewports(1, &vp);
+
+    // Setup shader and vertex buffers
+    unsigned int stride = sizeof(ImDrawVert);
+    unsigned int offset = 0;
+    ctx->IASetInputLayout(bd->pInputLayout);
+    ctx->IASetVertexBuffers(0, 1, &bd->pVB, &stride, &offset);
+    ctx->IASetIndexBuffer(bd->pIB, sizeof(ImDrawIdx) == 2 ? DXGI_FORMAT_R16_UINT : DXGI_FORMAT_R32_UINT, 0);
+    ctx->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+    ctx->VSSetShader(bd->pVertexShader, NULL, 0);
+    ctx->VSSetConstantBuffers(0, 1, &bd->pVertexConstantBuffer);
+    ctx->PSSetShader(bd->pPixelShader, NULL, 0);
+    ctx->PSSetSamplers(0, 1, &bd->pFontSampler);
+    ctx->GSSetShader(NULL, NULL, 0);
+    ctx->HSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
+    ctx->DSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
+    ctx->CSSetShader(NULL, NULL, 0); // In theory we should backup and restore this as well.. very infrequently used..
+
+    // Setup blend state
+    const float blend_factor[4] = { 0.f, 0.f, 0.f, 0.f };
+    ctx->OMSetBlendState(bd->pBlendState, blend_factor, 0xffffffff);
+    ctx->OMSetDepthStencilState(bd->pDepthStencilState, 0);
+    ctx->RSSetState(bd->pRasterizerState);
+}
+
+// Render function
+void ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    ID3D11DeviceContext* ctx = bd->pd3dDeviceContext;
+
+    // Create and grow vertex/index buffers if needed
+    if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
+    {
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
+        D3D11_BUFFER_DESC desc;
+        memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
+        desc.Usage = D3D11_USAGE_DYNAMIC;
+        desc.ByteWidth = bd->VertexBufferSize * sizeof(ImDrawVert);
+        desc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+        desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+        desc.MiscFlags = 0;
+        if (bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVB) < 0)
+            return;
+    }
+    if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
+    {
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
+        D3D11_BUFFER_DESC desc;
+        memset(&desc, 0, sizeof(D3D11_BUFFER_DESC));
+        desc.Usage = D3D11_USAGE_DYNAMIC;
+        desc.ByteWidth = bd->IndexBufferSize * sizeof(ImDrawIdx);
+        desc.BindFlags = D3D11_BIND_INDEX_BUFFER;
+        desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+        if (bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pIB) < 0)
+            return;
+    }
+
+    // Upload vertex/index data into a single contiguous GPU buffer
+    D3D11_MAPPED_SUBRESOURCE vtx_resource, idx_resource;
+    if (ctx->Map(bd->pVB, 0, D3D11_MAP_WRITE_DISCARD, 0, &vtx_resource) != S_OK)
+        return;
+    if (ctx->Map(bd->pIB, 0, D3D11_MAP_WRITE_DISCARD, 0, &idx_resource) != S_OK)
+        return;
+    ImDrawVert* vtx_dst = (ImDrawVert*)vtx_resource.pData;
+    ImDrawIdx* idx_dst = (ImDrawIdx*)idx_resource.pData;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
+        memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+        vtx_dst += cmd_list->VtxBuffer.Size;
+        idx_dst += cmd_list->IdxBuffer.Size;
+    }
+    ctx->Unmap(bd->pVB, 0);
+    ctx->Unmap(bd->pIB, 0);
+
+    // Setup orthographic projection matrix into our constant buffer
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    {
+        D3D11_MAPPED_SUBRESOURCE mapped_resource;
+        if (ctx->Map(bd->pVertexConstantBuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapped_resource) != S_OK)
+            return;
+        VERTEX_CONSTANT_BUFFER* constant_buffer = (VERTEX_CONSTANT_BUFFER*)mapped_resource.pData;
+        float L = draw_data->DisplayPos.x;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+        float T = draw_data->DisplayPos.y;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+        float mvp[4][4] =
+        {
+            { 2.0f/(R-L),   0.0f,           0.0f,       0.0f },
+            { 0.0f,         2.0f/(T-B),     0.0f,       0.0f },
+            { 0.0f,         0.0f,           0.5f,       0.0f },
+            { (R+L)/(L-R),  (T+B)/(B-T),    0.5f,       1.0f },
+        };
+        memcpy(&constant_buffer->mvp, mvp, sizeof(mvp));
+        ctx->Unmap(bd->pVertexConstantBuffer, 0);
+    }
+
+    // Backup DX state that will be modified to restore it afterwards (unfortunately this is very ugly looking and verbose. Close your eyes!)
+    struct BACKUP_DX11_STATE
+    {
+        UINT                        ScissorRectsCount, ViewportsCount;
+        D3D11_RECT                  ScissorRects[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
+        D3D11_VIEWPORT              Viewports[D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE];
+        ID3D11RasterizerState*      RS;
+        ID3D11BlendState*           BlendState;
+        FLOAT                       BlendFactor[4];
+        UINT                        SampleMask;
+        UINT                        StencilRef;
+        ID3D11DepthStencilState*    DepthStencilState;
+        ID3D11ShaderResourceView*   PSShaderResource;
+        ID3D11SamplerState*         PSSampler;
+        ID3D11PixelShader*          PS;
+        ID3D11VertexShader*         VS;
+        ID3D11GeometryShader*       GS;
+        UINT                        PSInstancesCount, VSInstancesCount, GSInstancesCount;
+        ID3D11ClassInstance         *PSInstances[256], *VSInstances[256], *GSInstances[256];   // 256 is max according to PSSetShader documentation
+        D3D11_PRIMITIVE_TOPOLOGY    PrimitiveTopology;
+        ID3D11Buffer*               IndexBuffer, *VertexBuffer, *VSConstantBuffer;
+        UINT                        IndexBufferOffset, VertexBufferStride, VertexBufferOffset;
+        DXGI_FORMAT                 IndexBufferFormat;
+        ID3D11InputLayout*          InputLayout;
+    };
+    BACKUP_DX11_STATE old = {};
+    old.ScissorRectsCount = old.ViewportsCount = D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
+    ctx->RSGetScissorRects(&old.ScissorRectsCount, old.ScissorRects);
+    ctx->RSGetViewports(&old.ViewportsCount, old.Viewports);
+    ctx->RSGetState(&old.RS);
+    ctx->OMGetBlendState(&old.BlendState, old.BlendFactor, &old.SampleMask);
+    ctx->OMGetDepthStencilState(&old.DepthStencilState, &old.StencilRef);
+    ctx->PSGetShaderResources(0, 1, &old.PSShaderResource);
+    ctx->PSGetSamplers(0, 1, &old.PSSampler);
+    old.PSInstancesCount = old.VSInstancesCount = old.GSInstancesCount = 256;
+    ctx->PSGetShader(&old.PS, old.PSInstances, &old.PSInstancesCount);
+    ctx->VSGetShader(&old.VS, old.VSInstances, &old.VSInstancesCount);
+    ctx->VSGetConstantBuffers(0, 1, &old.VSConstantBuffer);
+    ctx->GSGetShader(&old.GS, old.GSInstances, &old.GSInstancesCount);
+
+    ctx->IAGetPrimitiveTopology(&old.PrimitiveTopology);
+    ctx->IAGetIndexBuffer(&old.IndexBuffer, &old.IndexBufferFormat, &old.IndexBufferOffset);
+    ctx->IAGetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset);
+    ctx->IAGetInputLayout(&old.InputLayout);
+
+    // Setup desired DX state
+    ImGui_ImplDX11_SetupRenderState(draw_data, ctx);
+
+    // Render command lists
+    // (Because we merged all buffers into a single one, we maintain our own offset into them)
+    int global_idx_offset = 0;
+    int global_vtx_offset = 0;
+    ImVec2 clip_off = draw_data->DisplayPos;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback != NULL)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplDX11_SetupRenderState(draw_data, ctx);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
+                ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle
+                const D3D11_RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y };
+                ctx->RSSetScissorRects(1, &r);
+
+                // Bind texture, Draw
+                ID3D11ShaderResourceView* texture_srv = (ID3D11ShaderResourceView*)pcmd->GetTexID();
+                ctx->PSSetShaderResources(0, 1, &texture_srv);
+                ctx->DrawIndexed(pcmd->ElemCount, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset);
+            }
+        }
+        global_idx_offset += cmd_list->IdxBuffer.Size;
+        global_vtx_offset += cmd_list->VtxBuffer.Size;
+    }
+
+    // Restore modified DX state
+    ctx->RSSetScissorRects(old.ScissorRectsCount, old.ScissorRects);
+    ctx->RSSetViewports(old.ViewportsCount, old.Viewports);
+    ctx->RSSetState(old.RS); if (old.RS) old.RS->Release();
+    ctx->OMSetBlendState(old.BlendState, old.BlendFactor, old.SampleMask); if (old.BlendState) old.BlendState->Release();
+    ctx->OMSetDepthStencilState(old.DepthStencilState, old.StencilRef); if (old.DepthStencilState) old.DepthStencilState->Release();
+    ctx->PSSetShaderResources(0, 1, &old.PSShaderResource); if (old.PSShaderResource) old.PSShaderResource->Release();
+    ctx->PSSetSamplers(0, 1, &old.PSSampler); if (old.PSSampler) old.PSSampler->Release();
+    ctx->PSSetShader(old.PS, old.PSInstances, old.PSInstancesCount); if (old.PS) old.PS->Release();
+    for (UINT i = 0; i < old.PSInstancesCount; i++) if (old.PSInstances[i]) old.PSInstances[i]->Release();
+    ctx->VSSetShader(old.VS, old.VSInstances, old.VSInstancesCount); if (old.VS) old.VS->Release();
+    ctx->VSSetConstantBuffers(0, 1, &old.VSConstantBuffer); if (old.VSConstantBuffer) old.VSConstantBuffer->Release();
+    ctx->GSSetShader(old.GS, old.GSInstances, old.GSInstancesCount); if (old.GS) old.GS->Release();
+    for (UINT i = 0; i < old.VSInstancesCount; i++) if (old.VSInstances[i]) old.VSInstances[i]->Release();
+    ctx->IASetPrimitiveTopology(old.PrimitiveTopology);
+    ctx->IASetIndexBuffer(old.IndexBuffer, old.IndexBufferFormat, old.IndexBufferOffset); if (old.IndexBuffer) old.IndexBuffer->Release();
+    ctx->IASetVertexBuffers(0, 1, &old.VertexBuffer, &old.VertexBufferStride, &old.VertexBufferOffset); if (old.VertexBuffer) old.VertexBuffer->Release();
+    ctx->IASetInputLayout(old.InputLayout); if (old.InputLayout) old.InputLayout->Release();
+}
+
+static void ImGui_ImplDX11_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+
+    // Upload texture to graphics system
+    {
+        D3D11_TEXTURE2D_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.Width = width;
+        desc.Height = height;
+        desc.MipLevels = 1;
+        desc.ArraySize = 1;
+        desc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+        desc.SampleDesc.Count = 1;
+        desc.Usage = D3D11_USAGE_DEFAULT;
+        desc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
+        desc.CPUAccessFlags = 0;
+
+        ID3D11Texture2D* pTexture = NULL;
+        D3D11_SUBRESOURCE_DATA subResource;
+        subResource.pSysMem = pixels;
+        subResource.SysMemPitch = desc.Width * 4;
+        subResource.SysMemSlicePitch = 0;
+        bd->pd3dDevice->CreateTexture2D(&desc, &subResource, &pTexture);
+        IM_ASSERT(pTexture != NULL);
+
+        // Create texture view
+        D3D11_SHADER_RESOURCE_VIEW_DESC srvDesc;
+        ZeroMemory(&srvDesc, sizeof(srvDesc));
+        srvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+        srvDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
+        srvDesc.Texture2D.MipLevels = desc.MipLevels;
+        srvDesc.Texture2D.MostDetailedMip = 0;
+        bd->pd3dDevice->CreateShaderResourceView(pTexture, &srvDesc, &bd->pFontTextureView);
+        pTexture->Release();
+    }
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)bd->pFontTextureView);
+
+    // Create texture sampler
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    {
+        D3D11_SAMPLER_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+        desc.AddressU = D3D11_TEXTURE_ADDRESS_WRAP;
+        desc.AddressV = D3D11_TEXTURE_ADDRESS_WRAP;
+        desc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;
+        desc.MipLODBias = 0.f;
+        desc.ComparisonFunc = D3D11_COMPARISON_ALWAYS;
+        desc.MinLOD = 0.f;
+        desc.MaxLOD = 0.f;
+        bd->pd3dDevice->CreateSamplerState(&desc, &bd->pFontSampler);
+    }
+}
+
+bool    ImGui_ImplDX11_CreateDeviceObjects()
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    if (!bd->pd3dDevice)
+        return false;
+    if (bd->pFontSampler)
+        ImGui_ImplDX11_InvalidateDeviceObjects();
+
+    // By using D3DCompile() from <d3dcompiler.h> / d3dcompiler.lib, we introduce a dependency to a given version of d3dcompiler_XX.dll (see D3DCOMPILER_DLL_A)
+    // If you would like to use this DX11 sample code but remove this dependency you can:
+    //  1) compile once, save the compiled shader blobs into a file or source code and pass them to CreateVertexShader()/CreatePixelShader() [preferred solution]
+    //  2) use code to detect any version of the DLL and grab a pointer to D3DCompile from the DLL.
+    // See https://github.com/ocornut/imgui/pull/638 for sources and details.
+
+    // Create the vertex shader
+    {
+        static const char* vertexShader =
+            "cbuffer vertexBuffer : register(b0) \
+            {\
+              float4x4 ProjectionMatrix; \
+            };\
+            struct VS_INPUT\
+            {\
+              float2 pos : POSITION;\
+              float4 col : COLOR0;\
+              float2 uv  : TEXCOORD0;\
+            };\
+            \
+            struct PS_INPUT\
+            {\
+              float4 pos : SV_POSITION;\
+              float4 col : COLOR0;\
+              float2 uv  : TEXCOORD0;\
+            };\
+            \
+            PS_INPUT main(VS_INPUT input)\
+            {\
+              PS_INPUT output;\
+              output.pos = mul( ProjectionMatrix, float4(input.pos.xy, 0.f, 1.f));\
+              output.col = input.col;\
+              output.uv  = input.uv;\
+              return output;\
+            }";
+
+        ID3DBlob* vertexShaderBlob;
+        if (FAILED(D3DCompile(vertexShader, strlen(vertexShader), NULL, NULL, NULL, "main", "vs_4_0", 0, 0, &vertexShaderBlob, NULL)))
+            return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
+        if (bd->pd3dDevice->CreateVertexShader(vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), NULL, &bd->pVertexShader) != S_OK)
+        {
+            vertexShaderBlob->Release();
+            return false;
+        }
+
+        // Create the input layout
+        D3D11_INPUT_ELEMENT_DESC local_layout[] =
+        {
+            { "POSITION", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (UINT)IM_OFFSETOF(ImDrawVert, pos), D3D11_INPUT_PER_VERTEX_DATA, 0 },
+            { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT,   0, (UINT)IM_OFFSETOF(ImDrawVert, uv),  D3D11_INPUT_PER_VERTEX_DATA, 0 },
+            { "COLOR",    0, DXGI_FORMAT_R8G8B8A8_UNORM, 0, (UINT)IM_OFFSETOF(ImDrawVert, col), D3D11_INPUT_PER_VERTEX_DATA, 0 },
+        };
+        if (bd->pd3dDevice->CreateInputLayout(local_layout, 3, vertexShaderBlob->GetBufferPointer(), vertexShaderBlob->GetBufferSize(), &bd->pInputLayout) != S_OK)
+        {
+            vertexShaderBlob->Release();
+            return false;
+        }
+        vertexShaderBlob->Release();
+
+        // Create the constant buffer
+        {
+            D3D11_BUFFER_DESC desc;
+            desc.ByteWidth = sizeof(VERTEX_CONSTANT_BUFFER);
+            desc.Usage = D3D11_USAGE_DYNAMIC;
+            desc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
+            desc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
+            desc.MiscFlags = 0;
+            bd->pd3dDevice->CreateBuffer(&desc, NULL, &bd->pVertexConstantBuffer);
+        }
+    }
+
+    // Create the pixel shader
+    {
+        static const char* pixelShader =
+            "struct PS_INPUT\
+            {\
+            float4 pos : SV_POSITION;\
+            float4 col : COLOR0;\
+            float2 uv  : TEXCOORD0;\
+            };\
+            sampler sampler0;\
+            Texture2D texture0;\
+            \
+            float4 main(PS_INPUT input) : SV_Target\
+            {\
+            float4 out_col = input.col * texture0.Sample(sampler0, input.uv); \
+            return out_col; \
+            }";
+
+        ID3DBlob* pixelShaderBlob;
+        if (FAILED(D3DCompile(pixelShader, strlen(pixelShader), NULL, NULL, NULL, "main", "ps_4_0", 0, 0, &pixelShaderBlob, NULL)))
+            return false; // NB: Pass ID3DBlob* pErrorBlob to D3DCompile() to get error showing in (const char*)pErrorBlob->GetBufferPointer(). Make sure to Release() the blob!
+        if (bd->pd3dDevice->CreatePixelShader(pixelShaderBlob->GetBufferPointer(), pixelShaderBlob->GetBufferSize(), NULL, &bd->pPixelShader) != S_OK)
+        {
+            pixelShaderBlob->Release();
+            return false;
+        }
+        pixelShaderBlob->Release();
+    }
+
+    // Create the blending setup
+    {
+        D3D11_BLEND_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.AlphaToCoverageEnable = false;
+        desc.RenderTarget[0].BlendEnable = true;
+        desc.RenderTarget[0].SrcBlend = D3D11_BLEND_SRC_ALPHA;
+        desc.RenderTarget[0].DestBlend = D3D11_BLEND_INV_SRC_ALPHA;
+        desc.RenderTarget[0].BlendOp = D3D11_BLEND_OP_ADD;
+        desc.RenderTarget[0].SrcBlendAlpha = D3D11_BLEND_ONE;
+        desc.RenderTarget[0].DestBlendAlpha = D3D11_BLEND_INV_SRC_ALPHA;
+        desc.RenderTarget[0].BlendOpAlpha = D3D11_BLEND_OP_ADD;
+        desc.RenderTarget[0].RenderTargetWriteMask = D3D11_COLOR_WRITE_ENABLE_ALL;
+        bd->pd3dDevice->CreateBlendState(&desc, &bd->pBlendState);
+    }
+
+    // Create the rasterizer state
+    {
+        D3D11_RASTERIZER_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.FillMode = D3D11_FILL_SOLID;
+        desc.CullMode = D3D11_CULL_NONE;
+        desc.ScissorEnable = true;
+        desc.DepthClipEnable = true;
+        bd->pd3dDevice->CreateRasterizerState(&desc, &bd->pRasterizerState);
+    }
+
+    // Create depth-stencil State
+    {
+        D3D11_DEPTH_STENCIL_DESC desc;
+        ZeroMemory(&desc, sizeof(desc));
+        desc.DepthEnable = false;
+        desc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
+        desc.DepthFunc = D3D11_COMPARISON_ALWAYS;
+        desc.StencilEnable = false;
+        desc.FrontFace.StencilFailOp = desc.FrontFace.StencilDepthFailOp = desc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
+        desc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
+        desc.BackFace = desc.FrontFace;
+        bd->pd3dDevice->CreateDepthStencilState(&desc, &bd->pDepthStencilState);
+    }
+
+    ImGui_ImplDX11_CreateFontsTexture();
+
+    return true;
+}
+
+void    ImGui_ImplDX11_InvalidateDeviceObjects()
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    if (!bd->pd3dDevice)
+        return;
+
+    if (bd->pFontSampler)           { bd->pFontSampler->Release(); bd->pFontSampler = NULL; }
+    if (bd->pFontTextureView)       { bd->pFontTextureView->Release(); bd->pFontTextureView = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied data->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    if (bd->pIB)                    { bd->pIB->Release(); bd->pIB = NULL; }
+    if (bd->pVB)                    { bd->pVB->Release(); bd->pVB = NULL; }
+    if (bd->pBlendState)            { bd->pBlendState->Release(); bd->pBlendState = NULL; }
+    if (bd->pDepthStencilState)     { bd->pDepthStencilState->Release(); bd->pDepthStencilState = NULL; }
+    if (bd->pRasterizerState)       { bd->pRasterizerState->Release(); bd->pRasterizerState = NULL; }
+    if (bd->pPixelShader)           { bd->pPixelShader->Release(); bd->pPixelShader = NULL; }
+    if (bd->pVertexConstantBuffer)  { bd->pVertexConstantBuffer->Release(); bd->pVertexConstantBuffer = NULL; }
+    if (bd->pInputLayout)           { bd->pInputLayout->Release(); bd->pInputLayout = NULL; }
+    if (bd->pVertexShader)          { bd->pVertexShader->Release(); bd->pVertexShader = NULL; }
+}
+
+bool    ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplDX11_Data* bd = IM_NEW(ImGui_ImplDX11_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_dx11";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    // Get factory from device
+    IDXGIDevice* pDXGIDevice = NULL;
+    IDXGIAdapter* pDXGIAdapter = NULL;
+    IDXGIFactory* pFactory = NULL;
+
+    if (device->QueryInterface(IID_PPV_ARGS(&pDXGIDevice)) == S_OK)
+        if (pDXGIDevice->GetParent(IID_PPV_ARGS(&pDXGIAdapter)) == S_OK)
+            if (pDXGIAdapter->GetParent(IID_PPV_ARGS(&pFactory)) == S_OK)
+            {
+                bd->pd3dDevice = device;
+                bd->pd3dDeviceContext = device_context;
+                bd->pFactory = pFactory;
+            }
+    if (pDXGIDevice) pDXGIDevice->Release();
+    if (pDXGIAdapter) pDXGIAdapter->Release();
+    bd->pd3dDevice->AddRef();
+    bd->pd3dDeviceContext->AddRef();
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplDX11_InitPlatformInterface();
+
+    return true;
+}
+
+void ImGui_ImplDX11_Shutdown()
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplDX11_ShutdownPlatformInterface();
+    ImGui_ImplDX11_InvalidateDeviceObjects();
+    if (bd->pFactory)             { bd->pFactory->Release(); }
+    if (bd->pd3dDevice)           { bd->pd3dDevice->Release(); }
+    if (bd->pd3dDeviceContext)    { bd->pd3dDeviceContext->Release(); }
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+void ImGui_ImplDX11_NewFrame()
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX11_Init()?");
+
+    if (!bd->pFontSampler)
+        ImGui_ImplDX11_CreateDeviceObjects();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
+struct ImGui_ImplDX11_ViewportData
+{
+    IDXGISwapChain*                 SwapChain;
+    ID3D11RenderTargetView*         RTView;
+
+    ImGui_ImplDX11_ViewportData()   { SwapChain = NULL; RTView = NULL; }
+    ~ImGui_ImplDX11_ViewportData()  { IM_ASSERT(SwapChain == NULL && RTView == NULL); }
+};
+
+static void ImGui_ImplDX11_CreateWindow(ImGuiViewport* viewport)
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    ImGui_ImplDX11_ViewportData* vd = IM_NEW(ImGui_ImplDX11_ViewportData)();
+    viewport->RendererUserData = vd;
+
+    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
+    // Some backend will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
+    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
+    IM_ASSERT(hwnd != 0);
+
+    // Create swap chain
+    DXGI_SWAP_CHAIN_DESC sd;
+    ZeroMemory(&sd, sizeof(sd));
+    sd.BufferDesc.Width = (UINT)viewport->Size.x;
+    sd.BufferDesc.Height = (UINT)viewport->Size.y;
+    sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    sd.SampleDesc.Count = 1;
+    sd.SampleDesc.Quality = 0;
+    sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
+    sd.BufferCount = 1;
+    sd.OutputWindow = hwnd;
+    sd.Windowed = TRUE;
+    sd.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;
+    sd.Flags = 0;
+
+    IM_ASSERT(vd->SwapChain == NULL && vd->RTView == NULL);
+    bd->pFactory->CreateSwapChain(bd->pd3dDevice, &sd, &vd->SwapChain);
+
+    // Create the render target
+    if (vd->SwapChain)
+    {
+        ID3D11Texture2D* pBackBuffer;
+        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        pBackBuffer->Release();
+    }
+}
+
+static void ImGui_ImplDX11_DestroyWindow(ImGuiViewport* viewport)
+{
+    // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
+    if (ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData)
+    {
+        if (vd->SwapChain)
+            vd->SwapChain->Release();
+        vd->SwapChain = NULL;
+        if (vd->RTView)
+            vd->RTView->Release();
+        vd->RTView = NULL;
+        IM_DELETE(vd);
+    }
+    viewport->RendererUserData = NULL;
+}
+
+static void ImGui_ImplDX11_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
+    if (vd->RTView)
+    {
+        vd->RTView->Release();
+        vd->RTView = NULL;
+    }
+    if (vd->SwapChain)
+    {
+        ID3D11Texture2D* pBackBuffer = NULL;
+        vd->SwapChain->ResizeBuffers(0, (UINT)size.x, (UINT)size.y, DXGI_FORMAT_UNKNOWN, 0);
+        vd->SwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
+        if (pBackBuffer == NULL) { fprintf(stderr, "ImGui_ImplDX11_SetWindowSize() failed creating buffers.\n"); return; }
+        bd->pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &vd->RTView);
+        pBackBuffer->Release();
+    }
+}
+
+static void ImGui_ImplDX11_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX11_Data* bd = ImGui_ImplDX11_GetBackendData();
+    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
+    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+    bd->pd3dDeviceContext->OMSetRenderTargets(1, &vd->RTView, NULL);
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+        bd->pd3dDeviceContext->ClearRenderTargetView(vd->RTView, (float*)&clear_color);
+    ImGui_ImplDX11_RenderDrawData(viewport->DrawData);
+}
+
+static void ImGui_ImplDX11_SwapBuffers(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX11_ViewportData* vd = (ImGui_ImplDX11_ViewportData*)viewport->RendererUserData;
+    vd->SwapChain->Present(0, 0); // Present without vsync
+}
+
+static void ImGui_ImplDX11_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_CreateWindow = ImGui_ImplDX11_CreateWindow;
+    platform_io.Renderer_DestroyWindow = ImGui_ImplDX11_DestroyWindow;
+    platform_io.Renderer_SetWindowSize = ImGui_ImplDX11_SetWindowSize;
+    platform_io.Renderer_RenderWindow = ImGui_ImplDX11_RenderWindow;
+    platform_io.Renderer_SwapBuffers = ImGui_ImplDX11_SwapBuffers;
+}
+
+static void ImGui_ImplDX11_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}

extern/imgui_patched/backends/imgui_impl_dx11.h

@@ -0,0 +1,27 @@
+// dear imgui: Renderer Backend for DirectX11
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'ID3D11ShaderResourceView*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct ID3D11Device;
+struct ID3D11DeviceContext;
+
+IMGUI_IMPL_API bool     ImGui_ImplDX11_Init(ID3D11Device* device, ID3D11DeviceContext* device_context);
+IMGUI_IMPL_API void     ImGui_ImplDX11_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplDX11_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplDX11_RenderDrawData(ImDrawData* draw_data);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API void     ImGui_ImplDX11_InvalidateDeviceObjects();
+IMGUI_IMPL_API bool     ImGui_ImplDX11_CreateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_dx12.h

@@ -0,0 +1,39 @@
+// dear imgui: Renderer Backend for DirectX12
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'D3D12_GPU_DESCRIPTOR_HANDLE' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// Important: to compile on 32-bit systems, this backend requires code to be compiled with '#define ImTextureID ImU64'.
+// See imgui_impl_dx12.cpp file for details.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+#include <dxgiformat.h> // DXGI_FORMAT
+
+struct ID3D12Device;
+struct ID3D12DescriptorHeap;
+struct ID3D12GraphicsCommandList;
+struct D3D12_CPU_DESCRIPTOR_HANDLE;
+struct D3D12_GPU_DESCRIPTOR_HANDLE;
+
+// cmd_list is the command list that the implementation will use to render imgui draw lists.
+// Before calling the render function, caller must prepare cmd_list by resetting it and setting the appropriate
+// render target and descriptor heap that contains font_srv_cpu_desc_handle/font_srv_gpu_desc_handle.
+// font_srv_cpu_desc_handle and font_srv_gpu_desc_handle are handles to a single SRV descriptor to use for the internal font texture.
+IMGUI_IMPL_API bool     ImGui_ImplDX12_Init(ID3D12Device* device, int num_frames_in_flight, DXGI_FORMAT rtv_format, ID3D12DescriptorHeap* cbv_srv_heap,
+                                            D3D12_CPU_DESCRIPTOR_HANDLE font_srv_cpu_desc_handle, D3D12_GPU_DESCRIPTOR_HANDLE font_srv_gpu_desc_handle);
+IMGUI_IMPL_API void     ImGui_ImplDX12_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplDX12_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplDX12_RenderDrawData(ImDrawData* draw_data, ID3D12GraphicsCommandList* graphics_command_list);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API void     ImGui_ImplDX12_InvalidateDeviceObjects();
+IMGUI_IMPL_API bool     ImGui_ImplDX12_CreateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_dx9.cpp

@@ -0,0 +1,540 @@
+// dear imgui: Renderer Backend for DirectX9
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-06-25: DirectX9: Explicitly disable texture state stages after >= 1.
+//  2021-05-19: DirectX9: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-04-23: DirectX9: Explicitly setting up more graphics states to increase compatibility with unusual non-default states.
+//  2021-03-18: DirectX9: Calling IDirect3DStateBlock9::Capture() after CreateStateBlock() as a workaround for state restoring issues (see #3857).
+//  2021-03-03: DirectX9: Added support for IMGUI_USE_BGRA_PACKED_COLOR in user's imconfig file.
+//  2021-02-18: DirectX9: Change blending equation to preserve alpha in output buffer.
+//  2019-05-29: DirectX9: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: DirectX9: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2019-03-29: Misc: Fixed erroneous assert in ImGui_ImplDX9_InvalidateDeviceObjects().
+//  2019-01-16: Misc: Disabled fog before drawing UI's. Fixes issue #2288.
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-06-08: Misc: Extracted imgui_impl_dx9.cpp/.h away from the old combined DX9+Win32 example.
+//  2018-06-08: DirectX9: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-05-07: Render: Saving/restoring Transform because they don't seem to be included in the StateBlock. Setting shading mode to Gouraud.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplDX9_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+
+#include "imgui.h"
+#include "imgui_impl_dx9.h"
+
+// DirectX
+#include <d3d9.h>
+
+// DirectX data
+struct ImGui_ImplDX9_Data
+{
+    LPDIRECT3DDEVICE9           pd3dDevice;
+    LPDIRECT3DVERTEXBUFFER9     pVB;
+    LPDIRECT3DINDEXBUFFER9      pIB;
+    LPDIRECT3DTEXTURE9          FontTexture;
+    int                         VertexBufferSize;
+    int                         IndexBufferSize;
+
+    ImGui_ImplDX9_Data()        { memset((void*)this, 0, sizeof(*this)); VertexBufferSize = 5000; IndexBufferSize = 10000; }
+};
+
+struct CUSTOMVERTEX
+{
+    float    pos[3];
+    D3DCOLOR col;
+    float    uv[2];
+};
+#define D3DFVF_CUSTOMVERTEX (D3DFVF_XYZ|D3DFVF_DIFFUSE|D3DFVF_TEX1)
+
+#ifdef IMGUI_USE_BGRA_PACKED_COLOR
+#define IMGUI_COL_TO_DX9_ARGB(_COL)     (_COL)
+#else
+#define IMGUI_COL_TO_DX9_ARGB(_COL)     (((_COL) & 0xFF00FF00) | (((_COL) & 0xFF0000) >> 16) | (((_COL) & 0xFF) << 16))
+#endif
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplDX9_Data* ImGui_ImplDX9_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplDX9_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Forward Declarations
+static void ImGui_ImplDX9_InitPlatformInterface();
+static void ImGui_ImplDX9_ShutdownPlatformInterface();
+static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
+static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
+
+// Functions
+static void ImGui_ImplDX9_SetupRenderState(ImDrawData* draw_data)
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+
+    // Setup viewport
+    D3DVIEWPORT9 vp;
+    vp.X = vp.Y = 0;
+    vp.Width = (DWORD)draw_data->DisplaySize.x;
+    vp.Height = (DWORD)draw_data->DisplaySize.y;
+    vp.MinZ = 0.0f;
+    vp.MaxZ = 1.0f;
+    bd->pd3dDevice->SetViewport(&vp);
+
+    // Setup render state: fixed-pipeline, alpha-blending, no face culling, no depth testing, shade mode (for gradient), bilinear sampling.
+    bd->pd3dDevice->SetPixelShader(NULL);
+    bd->pd3dDevice->SetVertexShader(NULL);
+    bd->pd3dDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
+    bd->pd3dDevice->SetRenderState(D3DRS_SHADEMODE, D3DSHADE_GOURAUD);
+    bd->pd3dDevice->SetRenderState(D3DRS_ZWRITEENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_ALPHATESTENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);
+    bd->pd3dDevice->SetRenderState(D3DRS_ZENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, TRUE);
+    bd->pd3dDevice->SetRenderState(D3DRS_BLENDOP, D3DBLENDOP_ADD);
+    bd->pd3dDevice->SetRenderState(D3DRS_SRCBLEND, D3DBLEND_SRCALPHA);
+    bd->pd3dDevice->SetRenderState(D3DRS_DESTBLEND, D3DBLEND_INVSRCALPHA);
+    bd->pd3dDevice->SetRenderState(D3DRS_SEPARATEALPHABLENDENABLE, TRUE);
+    bd->pd3dDevice->SetRenderState(D3DRS_SRCBLENDALPHA, D3DBLEND_ONE);
+    bd->pd3dDevice->SetRenderState(D3DRS_DESTBLENDALPHA, D3DBLEND_INVSRCALPHA);
+    bd->pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, TRUE);
+    bd->pd3dDevice->SetRenderState(D3DRS_FOGENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_RANGEFOGENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_SPECULARENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_STENCILENABLE, FALSE);
+    bd->pd3dDevice->SetRenderState(D3DRS_CLIPPING, TRUE);
+    bd->pd3dDevice->SetRenderState(D3DRS_LIGHTING, FALSE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_COLOROP, D3DTOP_MODULATE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG1, D3DTA_TEXTURE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_COLORARG2, D3DTA_DIFFUSE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAOP, D3DTOP_MODULATE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG1, D3DTA_TEXTURE);
+    bd->pd3dDevice->SetTextureStageState(0, D3DTSS_ALPHAARG2, D3DTA_DIFFUSE);
+    bd->pd3dDevice->SetTextureStageState(1, D3DTSS_COLOROP, D3DTOP_DISABLE);
+    bd->pd3dDevice->SetTextureStageState(1, D3DTSS_ALPHAOP, D3DTOP_DISABLE);
+    bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MINFILTER, D3DTEXF_LINEAR);
+    bd->pd3dDevice->SetSamplerState(0, D3DSAMP_MAGFILTER, D3DTEXF_LINEAR);
+
+    // Setup orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    // Being agnostic of whether <d3dx9.h> or <DirectXMath.h> can be used, we aren't relying on D3DXMatrixIdentity()/D3DXMatrixOrthoOffCenterLH() or DirectX::XMMatrixIdentity()/DirectX::XMMatrixOrthographicOffCenterLH()
+    {
+        float L = draw_data->DisplayPos.x + 0.5f;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x + 0.5f;
+        float T = draw_data->DisplayPos.y + 0.5f;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y + 0.5f;
+        D3DMATRIX mat_identity = { { { 1.0f, 0.0f, 0.0f, 0.0f,  0.0f, 1.0f, 0.0f, 0.0f,  0.0f, 0.0f, 1.0f, 0.0f,  0.0f, 0.0f, 0.0f, 1.0f } } };
+        D3DMATRIX mat_projection =
+        { { {
+            2.0f/(R-L),   0.0f,         0.0f,  0.0f,
+            0.0f,         2.0f/(T-B),   0.0f,  0.0f,
+            0.0f,         0.0f,         0.5f,  0.0f,
+            (L+R)/(L-R),  (T+B)/(B-T),  0.5f,  1.0f
+        } } };
+        bd->pd3dDevice->SetTransform(D3DTS_WORLD, &mat_identity);
+        bd->pd3dDevice->SetTransform(D3DTS_VIEW, &mat_identity);
+        bd->pd3dDevice->SetTransform(D3DTS_PROJECTION, &mat_projection);
+    }
+}
+
+// Render function.
+void ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
+    // Create and grow buffers if needed
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    if (!bd->pVB || bd->VertexBufferSize < draw_data->TotalVtxCount)
+    {
+        if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+        bd->VertexBufferSize = draw_data->TotalVtxCount + 5000;
+        if (bd->pd3dDevice->CreateVertexBuffer(bd->VertexBufferSize * sizeof(CUSTOMVERTEX), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX, D3DPOOL_DEFAULT, &bd->pVB, NULL) < 0)
+            return;
+    }
+    if (!bd->pIB || bd->IndexBufferSize < draw_data->TotalIdxCount)
+    {
+        if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+        bd->IndexBufferSize = draw_data->TotalIdxCount + 10000;
+        if (bd->pd3dDevice->CreateIndexBuffer(bd->IndexBufferSize * sizeof(ImDrawIdx), D3DUSAGE_DYNAMIC | D3DUSAGE_WRITEONLY, sizeof(ImDrawIdx) == 2 ? D3DFMT_INDEX16 : D3DFMT_INDEX32, D3DPOOL_DEFAULT, &bd->pIB, NULL) < 0)
+            return;
+    }
+
+    // Backup the DX9 state
+    IDirect3DStateBlock9* d3d9_state_block = NULL;
+    if (bd->pd3dDevice->CreateStateBlock(D3DSBT_ALL, &d3d9_state_block) < 0)
+        return;
+    if (d3d9_state_block->Capture() < 0)
+    {
+        d3d9_state_block->Release();
+        return;
+    }
+
+    // Backup the DX9 transform (DX9 documentation suggests that it is included in the StateBlock but it doesn't appear to)
+    D3DMATRIX last_world, last_view, last_projection;
+    bd->pd3dDevice->GetTransform(D3DTS_WORLD, &last_world);
+    bd->pd3dDevice->GetTransform(D3DTS_VIEW, &last_view);
+    bd->pd3dDevice->GetTransform(D3DTS_PROJECTION, &last_projection);
+
+    // Allocate buffers
+    CUSTOMVERTEX* vtx_dst;
+    ImDrawIdx* idx_dst;
+    if (bd->pVB->Lock(0, (UINT)(draw_data->TotalVtxCount * sizeof(CUSTOMVERTEX)), (void**)&vtx_dst, D3DLOCK_DISCARD) < 0)
+    {
+        d3d9_state_block->Release();
+        return;
+    }
+    if (bd->pIB->Lock(0, (UINT)(draw_data->TotalIdxCount * sizeof(ImDrawIdx)), (void**)&idx_dst, D3DLOCK_DISCARD) < 0)
+    {
+        bd->pVB->Unlock();
+        d3d9_state_block->Release();
+        return;
+    }
+
+    // Copy and convert all vertices into a single contiguous buffer, convert colors to DX9 default format.
+    // FIXME-OPT: This is a minor waste of resource, the ideal is to use imconfig.h and
+    //  1) to avoid repacking colors:   #define IMGUI_USE_BGRA_PACKED_COLOR
+    //  2) to avoid repacking vertices: #define IMGUI_OVERRIDE_DRAWVERT_STRUCT_LAYOUT struct ImDrawVert { ImVec2 pos; float z; ImU32 col; ImVec2 uv; }
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        const ImDrawVert* vtx_src = cmd_list->VtxBuffer.Data;
+        for (int i = 0; i < cmd_list->VtxBuffer.Size; i++)
+        {
+            vtx_dst->pos[0] = vtx_src->pos.x;
+            vtx_dst->pos[1] = vtx_src->pos.y;
+            vtx_dst->pos[2] = 0.0f;
+            vtx_dst->col = IMGUI_COL_TO_DX9_ARGB(vtx_src->col);
+            vtx_dst->uv[0] = vtx_src->uv.x;
+            vtx_dst->uv[1] = vtx_src->uv.y;
+            vtx_dst++;
+            vtx_src++;
+        }
+        memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+        idx_dst += cmd_list->IdxBuffer.Size;
+    }
+    bd->pVB->Unlock();
+    bd->pIB->Unlock();
+    bd->pd3dDevice->SetStreamSource(0, bd->pVB, 0, sizeof(CUSTOMVERTEX));
+    bd->pd3dDevice->SetIndices(bd->pIB);
+    bd->pd3dDevice->SetFVF(D3DFVF_CUSTOMVERTEX);
+
+    // Setup desired DX state
+    ImGui_ImplDX9_SetupRenderState(draw_data);
+
+    // Render command lists
+    // (Because we merged all buffers into a single one, we maintain our own offset into them)
+    int global_vtx_offset = 0;
+    int global_idx_offset = 0;
+    ImVec2 clip_off = draw_data->DisplayPos;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback != NULL)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplDX9_SetupRenderState(draw_data);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min(pcmd->ClipRect.x - clip_off.x, pcmd->ClipRect.y - clip_off.y);
+                ImVec2 clip_max(pcmd->ClipRect.z - clip_off.x, pcmd->ClipRect.w - clip_off.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply Scissor/clipping rectangle, Bind texture, Draw
+                const RECT r = { (LONG)clip_min.x, (LONG)clip_min.y, (LONG)clip_max.x, (LONG)clip_max.y };
+                const LPDIRECT3DTEXTURE9 texture = (LPDIRECT3DTEXTURE9)pcmd->GetTexID();
+                bd->pd3dDevice->SetTexture(0, texture);
+                bd->pd3dDevice->SetScissorRect(&r);
+                bd->pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, pcmd->VtxOffset + global_vtx_offset, 0, (UINT)cmd_list->VtxBuffer.Size, pcmd->IdxOffset + global_idx_offset, pcmd->ElemCount / 3);
+            }
+        }
+        global_idx_offset += cmd_list->IdxBuffer.Size;
+        global_vtx_offset += cmd_list->VtxBuffer.Size;
+    }
+
+    // When using multi-viewports, it appears that there's an odd logic in DirectX9 which prevent subsequent windows
+    // from rendering until the first window submits at least one draw call, even once. That's our workaround. (see #2560)
+    if (global_vtx_offset == 0)
+        bd->pd3dDevice->DrawIndexedPrimitive(D3DPT_TRIANGLELIST, 0, 0, 0, 0, 0);
+
+    // Restore the DX9 transform
+    bd->pd3dDevice->SetTransform(D3DTS_WORLD, &last_world);
+    bd->pd3dDevice->SetTransform(D3DTS_VIEW, &last_view);
+    bd->pd3dDevice->SetTransform(D3DTS_PROJECTION, &last_projection);
+
+    // Restore the DX9 state
+    d3d9_state_block->Apply();
+    d3d9_state_block->Release();
+}
+
+bool ImGui_ImplDX9_Init(IDirect3DDevice9* device)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplDX9_Data* bd = IM_NEW(ImGui_ImplDX9_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_dx9";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    bd->pd3dDevice = device;
+    bd->pd3dDevice->AddRef();
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplDX9_InitPlatformInterface();
+
+    return true;
+}
+
+void ImGui_ImplDX9_Shutdown()
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplDX9_ShutdownPlatformInterface();
+    ImGui_ImplDX9_InvalidateDeviceObjects();
+    if (bd->pd3dDevice) { bd->pd3dDevice->Release(); }
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+static bool ImGui_ImplDX9_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    unsigned char* pixels;
+    int width, height, bytes_per_pixel;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &bytes_per_pixel);
+
+    // Convert RGBA32 to BGRA32 (because RGBA32 is not well supported by DX9 devices)
+#ifndef IMGUI_USE_BGRA_PACKED_COLOR
+    if (io.Fonts->TexPixelsUseColors)
+    {
+        ImU32* dst_start = (ImU32*)ImGui::MemAlloc((size_t)width * height * bytes_per_pixel);
+        for (ImU32* src = (ImU32*)pixels, *dst = dst_start, *dst_end = dst_start + (size_t)width * height; dst < dst_end; src++, dst++)
+            *dst = IMGUI_COL_TO_DX9_ARGB(*src);
+        pixels = (unsigned char*)dst_start;
+    }
+#endif
+
+    // Upload texture to graphics system
+    bd->FontTexture = NULL;
+    if (bd->pd3dDevice->CreateTexture(width, height, 1, D3DUSAGE_DYNAMIC, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &bd->FontTexture, NULL) < 0)
+        return false;
+    D3DLOCKED_RECT tex_locked_rect;
+    if (bd->FontTexture->LockRect(0, &tex_locked_rect, NULL, 0) != D3D_OK)
+        return false;
+    for (int y = 0; y < height; y++)
+        memcpy((unsigned char*)tex_locked_rect.pBits + (size_t)tex_locked_rect.Pitch * y, pixels + (size_t)width * bytes_per_pixel * y, (size_t)width * bytes_per_pixel);
+    bd->FontTexture->UnlockRect(0);
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)bd->FontTexture);
+
+#ifndef IMGUI_USE_BGRA_PACKED_COLOR
+    if (io.Fonts->TexPixelsUseColors)
+        ImGui::MemFree(pixels);
+#endif
+
+    return true;
+}
+
+bool ImGui_ImplDX9_CreateDeviceObjects()
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    if (!bd || !bd->pd3dDevice)
+        return false;
+    if (!ImGui_ImplDX9_CreateFontsTexture())
+        return false;
+    ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows();
+    return true;
+}
+
+void ImGui_ImplDX9_InvalidateDeviceObjects()
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    if (!bd || !bd->pd3dDevice)
+        return;
+    if (bd->pVB) { bd->pVB->Release(); bd->pVB = NULL; }
+    if (bd->pIB) { bd->pIB->Release(); bd->pIB = NULL; }
+    if (bd->FontTexture) { bd->FontTexture->Release(); bd->FontTexture = NULL; ImGui::GetIO().Fonts->SetTexID(NULL); } // We copied bd->pFontTextureView to io.Fonts->TexID so let's clear that as well.
+    ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows();
+}
+
+void ImGui_ImplDX9_NewFrame()
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplDX9_Init()?");
+
+    if (!bd->FontTexture)
+        ImGui_ImplDX9_CreateDeviceObjects();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
+struct ImGui_ImplDX9_ViewportData
+{
+    IDirect3DSwapChain9*    SwapChain;
+    D3DPRESENT_PARAMETERS   d3dpp;
+
+    ImGui_ImplDX9_ViewportData()  { SwapChain = NULL; ZeroMemory(&d3dpp, sizeof(D3DPRESENT_PARAMETERS)); }
+    ~ImGui_ImplDX9_ViewportData() { IM_ASSERT(SwapChain == NULL); }
+};
+
+static void ImGui_ImplDX9_CreateWindow(ImGuiViewport* viewport)
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    ImGui_ImplDX9_ViewportData* vd = IM_NEW(ImGui_ImplDX9_ViewportData)();
+    viewport->RendererUserData = vd;
+
+    // PlatformHandleRaw should always be a HWND, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
+    // Some backends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the HWND.
+    HWND hwnd = viewport->PlatformHandleRaw ? (HWND)viewport->PlatformHandleRaw : (HWND)viewport->PlatformHandle;
+    IM_ASSERT(hwnd != 0);
+
+    ZeroMemory(&vd->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
+    vd->d3dpp.Windowed = TRUE;
+    vd->d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
+    vd->d3dpp.BackBufferWidth = (UINT)viewport->Size.x;
+    vd->d3dpp.BackBufferHeight = (UINT)viewport->Size.y;
+    vd->d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
+    vd->d3dpp.hDeviceWindow = hwnd;
+    vd->d3dpp.EnableAutoDepthStencil = FALSE;
+    vd->d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
+    vd->d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;   // Present without vsync
+
+    HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
+    IM_ASSERT(hr == D3D_OK);
+    IM_ASSERT(vd->SwapChain != NULL);
+}
+
+static void ImGui_ImplDX9_DestroyWindow(ImGuiViewport* viewport)
+{
+    // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
+    if (ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData)
+    {
+        if (vd->SwapChain)
+            vd->SwapChain->Release();
+        vd->SwapChain = NULL;
+        ZeroMemory(&vd->d3dpp, sizeof(D3DPRESENT_PARAMETERS));
+        IM_DELETE(vd);
+    }
+    viewport->RendererUserData = NULL;
+}
+
+static void ImGui_ImplDX9_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
+    if (vd->SwapChain)
+    {
+        vd->SwapChain->Release();
+        vd->SwapChain = NULL;
+        vd->d3dpp.BackBufferWidth = (UINT)size.x;
+        vd->d3dpp.BackBufferHeight = (UINT)size.y;
+        HRESULT hr = bd->pd3dDevice->CreateAdditionalSwapChain(&vd->d3dpp, &vd->SwapChain); IM_UNUSED(hr);
+        IM_ASSERT(hr == D3D_OK);
+    }
+}
+
+static void ImGui_ImplDX9_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX9_Data* bd = ImGui_ImplDX9_GetBackendData();
+    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
+    ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+
+    LPDIRECT3DSURFACE9 render_target = NULL;
+    LPDIRECT3DSURFACE9 last_render_target = NULL;
+    LPDIRECT3DSURFACE9 last_depth_stencil = NULL;
+    vd->SwapChain->GetBackBuffer(0, D3DBACKBUFFER_TYPE_MONO, &render_target);
+    bd->pd3dDevice->GetRenderTarget(0, &last_render_target);
+    bd->pd3dDevice->GetDepthStencilSurface(&last_depth_stencil);
+    bd->pd3dDevice->SetRenderTarget(0, render_target);
+    bd->pd3dDevice->SetDepthStencilSurface(NULL);
+
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+    {
+        D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*255.0f), (int)(clear_color.y*255.0f), (int)(clear_color.z*255.0f), (int)(clear_color.w*255.0f));
+        bd->pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET, clear_col_dx, 1.0f, 0);
+    }
+
+    ImGui_ImplDX9_RenderDrawData(viewport->DrawData);
+
+    // Restore render target
+    bd->pd3dDevice->SetRenderTarget(0, last_render_target);
+    bd->pd3dDevice->SetDepthStencilSurface(last_depth_stencil);
+    render_target->Release();
+    last_render_target->Release();
+    if (last_depth_stencil) last_depth_stencil->Release();
+}
+
+static void ImGui_ImplDX9_SwapBuffers(ImGuiViewport* viewport, void*)
+{
+    ImGui_ImplDX9_ViewportData* vd = (ImGui_ImplDX9_ViewportData*)viewport->RendererUserData;
+    HRESULT hr = vd->SwapChain->Present(NULL, NULL, vd->d3dpp.hDeviceWindow, NULL, 0);
+    // Let main application handle D3DERR_DEVICELOST by resetting the device.
+    IM_ASSERT(hr == D3D_OK || hr == D3DERR_DEVICELOST);
+}
+
+static void ImGui_ImplDX9_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_CreateWindow = ImGui_ImplDX9_CreateWindow;
+    platform_io.Renderer_DestroyWindow = ImGui_ImplDX9_DestroyWindow;
+    platform_io.Renderer_SetWindowSize = ImGui_ImplDX9_SetWindowSize;
+    platform_io.Renderer_RenderWindow = ImGui_ImplDX9_RenderWindow;
+    platform_io.Renderer_SwapBuffers = ImGui_ImplDX9_SwapBuffers;
+}
+
+static void ImGui_ImplDX9_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}
+
+static void ImGui_ImplDX9_CreateDeviceObjectsForPlatformWindows()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int i = 1; i < platform_io.Viewports.Size; i++)
+        if (!platform_io.Viewports[i]->RendererUserData)
+            ImGui_ImplDX9_CreateWindow(platform_io.Viewports[i]);
+}
+
+static void ImGui_ImplDX9_InvalidateDeviceObjectsForPlatformWindows()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int i = 1; i < platform_io.Viewports.Size; i++)
+        if (platform_io.Viewports[i]->RendererUserData)
+            ImGui_ImplDX9_DestroyWindow(platform_io.Viewports[i]);
+}

extern/imgui_patched/backends/imgui_impl_dx9.h

@@ -0,0 +1,26 @@
+// dear imgui: Renderer Backend for DirectX9
+// This needs to be used along with a Platform Backend (e.g. Win32)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'LPDIRECT3DTEXTURE9' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct IDirect3DDevice9;
+
+IMGUI_IMPL_API bool     ImGui_ImplDX9_Init(IDirect3DDevice9* device);
+IMGUI_IMPL_API void     ImGui_ImplDX9_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplDX9_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplDX9_RenderDrawData(ImDrawData* draw_data);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API bool     ImGui_ImplDX9_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplDX9_InvalidateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_glfw.h

@@ -0,0 +1,51 @@
+// dear imgui: Platform Backend for GLFW
+// This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan, WebGPU..)
+// (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
+// (Requires: GLFW 3.1+. Prefer GLFW 3.3+ for full feature support.)
+
+// Implemented features:
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLFW_KEY_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+//  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [x] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange' (note: the resizing cursors requires GLFW 3.4+).
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// Issues:
+//  [ ] Platform: Multi-viewport support: ParentViewportID not honored, and so io.ConfigViewportsNoDefaultParent has no effect (minor).
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// About GLSL version:
+// The 'glsl_version' initialization parameter defaults to "#version 150" if NULL.
+// Only override if your GL version doesn't handle this GLSL version. Keep NULL if unsure!
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct GLFWwindow;
+struct GLFWmonitor;
+
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOther(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplGlfw_NewFrame();
+
+// GLFW callbacks (installer)
+// - When calling Init with 'install_callbacks=true': ImGui_ImplGlfw_InstallCallbacks() is called. GLFW callbacks will be installed for you. They will chain-call user's previously installed callbacks, if any.
+// - When calling Init with 'install_callbacks=false': GLFW callbacks won't be installed. You will need to call individual function yourself from your own GLFW callbacks.
+IMGUI_IMPL_API void     ImGui_ImplGlfw_InstallCallbacks(GLFWwindow* window);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_RestoreCallbacks(GLFWwindow* window);
+
+// GLFW callbacks (individual callbacks to call if you didn't install callbacks)
+IMGUI_IMPL_API void     ImGui_ImplGlfw_WindowFocusCallback(GLFWwindow* window, int focused);        // Since 1.84
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CursorEnterCallback(GLFWwindow* window, int entered);        // Since 1.84
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CursorPosCallback(GLFWwindow* window, double x, double y);   // Since 1.87
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MonitorCallback(GLFWmonitor* monitor, int event);

extern/imgui_patched/backends/imgui_impl_glut.cpp

@@ -0,0 +1,297 @@
+// dear imgui: Platform Backend for GLUT/FreeGLUT
+// This needs to be used along with a Renderer (e.g. OpenGL2)
+
+// !!! GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE. Using GLUT is not recommended unless you really miss the 90's. !!!
+// !!! If someone or something is teaching you GLUT today, you are being abused. Please show some resistance. !!!
+// !!! Nowadays, prefer using GLFW or SDL instead!
+
+// Implemented features:
+//  [X] Platform: Partial keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLUT values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+// Issues:
+//  [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I
+//  [ ] Platform: Missing mouse cursor shape/visibility support.
+//  [ ] Platform: Missing clipboard support (not supported by Glut).
+//  [ ] Platform: Missing gamepad support.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
+//  2022-01-17: Inputs: calling new io.AddMousePosEvent(), io.AddMouseButtonEvent(), io.AddMouseWheelEvent() API (1.87+).
+//  2022-01-10: Inputs: calling new io.AddKeyEvent(), io.AddKeyModsEvent() + io.SetKeyEventNativeData() API (1.87+). Support for full ImGuiKey range.
+//  2019-04-03: Misc: Renamed imgui_impl_freeglut.cpp/.h to imgui_impl_glut.cpp/.h.
+//  2019-03-25: Misc: Made io.DeltaTime always above zero.
+//  2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
+//  2018-03-22: Added GLUT Platform binding.
+
+#include "imgui.h"
+#include "imgui_impl_glut.h"
+#ifdef __APPLE__
+#include <GLUT/glut.h>
+#else
+#include <GL/freeglut.h>
+#endif
+
+#ifdef _MSC_VER
+#pragma warning (disable: 4505) // unreferenced local function has been removed (stb stuff)
+#endif
+
+static int g_Time = 0;          // Current time, in milliseconds
+
+// Glut has 1 function for characters and one for "special keys". We map the characters in the 0..255 range and the keys above.
+static ImGuiKey ImGui_ImplGLUT_KeyToImGuiKey(int key)
+{
+    switch (key)
+    {
+        case '\t':                      return ImGuiKey_Tab;
+        case 256 + GLUT_KEY_LEFT:       return ImGuiKey_LeftArrow;
+        case 256 + GLUT_KEY_RIGHT:      return ImGuiKey_RightArrow;
+        case 256 + GLUT_KEY_UP:         return ImGuiKey_UpArrow;
+        case 256 + GLUT_KEY_DOWN:       return ImGuiKey_DownArrow;
+        case 256 + GLUT_KEY_PAGE_UP:    return ImGuiKey_PageUp;
+        case 256 + GLUT_KEY_PAGE_DOWN:  return ImGuiKey_PageDown;
+        case 256 + GLUT_KEY_HOME:       return ImGuiKey_Home;
+        case 256 + GLUT_KEY_END:        return ImGuiKey_End;
+        case 256 + GLUT_KEY_INSERT:     return ImGuiKey_Insert;
+        case 127:                       return ImGuiKey_Delete;
+        case 8:                         return ImGuiKey_Backspace;
+        case ' ':                       return ImGuiKey_Space;
+        case 13:                        return ImGuiKey_Enter;
+        case 27:                        return ImGuiKey_Escape;
+        case 39:                        return ImGuiKey_Apostrophe;
+        case 44:                        return ImGuiKey_Comma;
+        case 45:                        return ImGuiKey_Minus;
+        case 46:                        return ImGuiKey_Period;
+        case 47:                        return ImGuiKey_Slash;
+        case 59:                        return ImGuiKey_Semicolon;
+        case 61:                        return ImGuiKey_Equal;
+        case 91:                        return ImGuiKey_LeftBracket;
+        case 92:                        return ImGuiKey_Backslash;
+        case 93:                        return ImGuiKey_RightBracket;
+        case 96:                        return ImGuiKey_GraveAccent;
+        //case 0:                         return ImGuiKey_CapsLock;
+        //case 0:                         return ImGuiKey_ScrollLock;
+        case 256 + 0x006D:              return ImGuiKey_NumLock;
+        //case 0:                         return ImGuiKey_PrintScreen;
+        //case 0:                         return ImGuiKey_Pause;
+        //case '0':                       return ImGuiKey_Keypad0;
+        //case '1':                       return ImGuiKey_Keypad1;
+        //case '2':                       return ImGuiKey_Keypad2;
+        //case '3':                       return ImGuiKey_Keypad3;
+        //case '4':                       return ImGuiKey_Keypad4;
+        //case '5':                       return ImGuiKey_Keypad5;
+        //case '6':                       return ImGuiKey_Keypad6;
+        //case '7':                       return ImGuiKey_Keypad7;
+        //case '8':                       return ImGuiKey_Keypad8;
+        //case '9':                       return ImGuiKey_Keypad9;
+        //case 46:                        return ImGuiKey_KeypadDecimal;
+        //case 47:                        return ImGuiKey_KeypadDivide;
+        case 42:                        return ImGuiKey_KeypadMultiply;
+        //case 45:                        return ImGuiKey_KeypadSubtract;
+        case 43:                        return ImGuiKey_KeypadAdd;
+        //case 13:                        return ImGuiKey_KeypadEnter;
+        //case 0:                         return ImGuiKey_KeypadEqual;
+        case 256 + 0x0072:              return ImGuiKey_LeftCtrl;
+        case 256 + 0x0070:              return ImGuiKey_LeftShift;
+        case 256 + 0x0074:              return ImGuiKey_LeftAlt;
+        //case 0:                         return ImGuiKey_LeftSuper;
+        case 256 + 0x0073:              return ImGuiKey_RightCtrl;
+        case 256 + 0x0071:              return ImGuiKey_RightShift;
+        case 256 + 0x0075:              return ImGuiKey_RightAlt;
+        //case 0:                         return ImGuiKey_RightSuper;
+        //case 0:                         return ImGuiKey_Menu;
+        case '0':                       return ImGuiKey_0;
+        case '1':                       return ImGuiKey_1;
+        case '2':                       return ImGuiKey_2;
+        case '3':                       return ImGuiKey_3;
+        case '4':                       return ImGuiKey_4;
+        case '5':                       return ImGuiKey_5;
+        case '6':                       return ImGuiKey_6;
+        case '7':                       return ImGuiKey_7;
+        case '8':                       return ImGuiKey_8;
+        case '9':                       return ImGuiKey_9;
+        case 'A': case 'a':             return ImGuiKey_A;
+        case 'B': case 'b':             return ImGuiKey_B;
+        case 'C': case 'c':             return ImGuiKey_C;
+        case 'D': case 'd':             return ImGuiKey_D;
+        case 'E': case 'e':             return ImGuiKey_E;
+        case 'F': case 'f':             return ImGuiKey_F;
+        case 'G': case 'g':             return ImGuiKey_G;
+        case 'H': case 'h':             return ImGuiKey_H;
+        case 'I': case 'i':             return ImGuiKey_I;
+        case 'J': case 'j':             return ImGuiKey_J;
+        case 'K': case 'k':             return ImGuiKey_K;
+        case 'L': case 'l':             return ImGuiKey_L;
+        case 'M': case 'm':             return ImGuiKey_M;
+        case 'N': case 'n':             return ImGuiKey_N;
+        case 'O': case 'o':             return ImGuiKey_O;
+        case 'P': case 'p':             return ImGuiKey_P;
+        case 'Q': case 'q':             return ImGuiKey_Q;
+        case 'R': case 'r':             return ImGuiKey_R;
+        case 'S': case 's':             return ImGuiKey_S;
+        case 'T': case 't':             return ImGuiKey_T;
+        case 'U': case 'u':             return ImGuiKey_U;
+        case 'V': case 'v':             return ImGuiKey_V;
+        case 'W': case 'w':             return ImGuiKey_W;
+        case 'X': case 'x':             return ImGuiKey_X;
+        case 'Y': case 'y':             return ImGuiKey_Y;
+        case 'Z': case 'z':             return ImGuiKey_Z;
+        case 256 + GLUT_KEY_F1:         return ImGuiKey_F1;
+        case 256 + GLUT_KEY_F2:         return ImGuiKey_F2;
+        case 256 + GLUT_KEY_F3:         return ImGuiKey_F3;
+        case 256 + GLUT_KEY_F4:         return ImGuiKey_F4;
+        case 256 + GLUT_KEY_F5:         return ImGuiKey_F5;
+        case 256 + GLUT_KEY_F6:         return ImGuiKey_F6;
+        case 256 + GLUT_KEY_F7:         return ImGuiKey_F7;
+        case 256 + GLUT_KEY_F8:         return ImGuiKey_F8;
+        case 256 + GLUT_KEY_F9:         return ImGuiKey_F9;
+        case 256 + GLUT_KEY_F10:        return ImGuiKey_F10;
+        case 256 + GLUT_KEY_F11:        return ImGuiKey_F11;
+        case 256 + GLUT_KEY_F12:        return ImGuiKey_F12;
+        default:                        return ImGuiKey_None;
+    }
+}
+
+bool ImGui_ImplGLUT_Init()
+{
+    ImGuiIO& io = ImGui::GetIO();
+
+#ifdef FREEGLUT
+    io.BackendPlatformName = "imgui_impl_glut (freeglut)";
+#else
+    io.BackendPlatformName = "imgui_impl_glut";
+#endif
+    g_Time = 0;
+
+    return true;
+}
+
+void ImGui_ImplGLUT_InstallFuncs()
+{
+    glutReshapeFunc(ImGui_ImplGLUT_ReshapeFunc);
+    glutMotionFunc(ImGui_ImplGLUT_MotionFunc);
+    glutPassiveMotionFunc(ImGui_ImplGLUT_MotionFunc);
+    glutMouseFunc(ImGui_ImplGLUT_MouseFunc);
+#ifdef __FREEGLUT_EXT_H__
+    glutMouseWheelFunc(ImGui_ImplGLUT_MouseWheelFunc);
+#endif
+    glutKeyboardFunc(ImGui_ImplGLUT_KeyboardFunc);
+    glutKeyboardUpFunc(ImGui_ImplGLUT_KeyboardUpFunc);
+    glutSpecialFunc(ImGui_ImplGLUT_SpecialFunc);
+    glutSpecialUpFunc(ImGui_ImplGLUT_SpecialUpFunc);
+}
+
+void ImGui_ImplGLUT_Shutdown()
+{
+}
+
+void ImGui_ImplGLUT_NewFrame()
+{
+    // Setup time step
+    ImGuiIO& io = ImGui::GetIO();
+    int current_time = glutGet(GLUT_ELAPSED_TIME);
+    int delta_time_ms = (current_time - g_Time);
+    if (delta_time_ms <= 0)
+        delta_time_ms = 1;
+    io.DeltaTime = delta_time_ms / 1000.0f;
+    g_Time = current_time;
+
+    // Start the frame
+    ImGui::NewFrame();
+}
+
+static void ImGui_ImplGLUT_UpdateKeyModifiers()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    int glut_key_mods = glutGetModifiers();
+    io.AddKeyEvent(ImGuiKey_ModCtrl, (glut_key_mods & GLUT_ACTIVE_CTRL) != 0);
+    io.AddKeyEvent(ImGuiKey_ModShift, (glut_key_mods & GLUT_ACTIVE_SHIFT) != 0);
+    io.AddKeyEvent(ImGuiKey_ModAlt, (glut_key_mods & GLUT_ACTIVE_ALT) != 0);
+}
+
+static void ImGui_ImplGLUT_AddKeyEvent(ImGuiKey key, bool down, int native_keycode)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddKeyEvent(key, down);
+    io.SetKeyEventNativeData(key, native_keycode, -1); // To support legacy indexing (<1.87 user code)
+}
+
+void ImGui_ImplGLUT_KeyboardFunc(unsigned char c, int x, int y)
+{
+    // Send character to imgui
+    //printf("char_down_func %d '%c'\n", c, c);
+    ImGuiIO& io = ImGui::GetIO();
+    if (c >= 32)
+        io.AddInputCharacter((unsigned int)c);
+
+    ImGuiKey key = ImGui_ImplGLUT_KeyToImGuiKey(c);
+    ImGui_ImplGLUT_AddKeyEvent(key, true, c);
+    ImGui_ImplGLUT_UpdateKeyModifiers();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplGLUT_KeyboardUpFunc(unsigned char c, int x, int y)
+{
+    //printf("char_up_func %d '%c'\n", c, c);
+    ImGuiKey key = ImGui_ImplGLUT_KeyToImGuiKey(c);
+    ImGui_ImplGLUT_AddKeyEvent(key, false, c);
+    ImGui_ImplGLUT_UpdateKeyModifiers();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplGLUT_SpecialFunc(int key, int x, int y)
+{
+    //printf("key_down_func %d\n", key);
+    ImGuiKey imgui_key = ImGui_ImplGLUT_KeyToImGuiKey(key + 256);
+    ImGui_ImplGLUT_AddKeyEvent(imgui_key, true, key + 256);
+    ImGui_ImplGLUT_UpdateKeyModifiers();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplGLUT_SpecialUpFunc(int key, int x, int y)
+{
+    //printf("key_up_func %d\n", key);
+    ImGuiKey imgui_key = ImGui_ImplGLUT_KeyToImGuiKey(key + 256);
+    ImGui_ImplGLUT_AddKeyEvent(imgui_key, false, key + 256);
+    ImGui_ImplGLUT_UpdateKeyModifiers();
+    (void)x; (void)y; // Unused
+}
+
+void ImGui_ImplGLUT_MouseFunc(int glut_button, int state, int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddMousePosEvent((float)x, (float)y);
+    int button = -1;
+    if (glut_button == GLUT_LEFT_BUTTON) button = 0;
+    if (glut_button == GLUT_RIGHT_BUTTON) button = 1;
+    if (glut_button == GLUT_MIDDLE_BUTTON) button = 2;
+    if (button != -1 && (state == GLUT_DOWN || state == GLUT_UP))
+        io.AddMouseButtonEvent(button, state == GLUT_DOWN);
+}
+
+#ifdef __FREEGLUT_EXT_H__
+void ImGui_ImplGLUT_MouseWheelFunc(int button, int dir, int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddMousePosEvent((float)x, (float)y);
+    if (dir != 0)
+        io.AddMouseWheelEvent(0.0f, dir > 0 ? 1.0f : -1.0f);
+    (void)button; // Unused
+}
+#endif
+
+void ImGui_ImplGLUT_ReshapeFunc(int w, int h)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.DisplaySize = ImVec2((float)w, (float)h);
+}
+
+void ImGui_ImplGLUT_MotionFunc(int x, int y)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddMousePosEvent((float)x, (float)y);
+}

extern/imgui_patched/backends/imgui_impl_glut.h

@@ -0,0 +1,39 @@
+// dear imgui: Platform Backend for GLUT/FreeGLUT
+// This needs to be used along with a Renderer (e.g. OpenGL2)
+
+// !!! GLUT/FreeGLUT IS OBSOLETE PREHISTORIC SOFTWARE. Using GLUT is not recommended unless you really miss the 90's. !!!
+// !!! If someone or something is teaching you GLUT today, you are being abused. Please show some resistance. !!!
+// !!! Nowadays, prefer using GLFW or SDL instead!
+
+// Implemented features:
+//  [X] Platform: Partial keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy GLUT values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+// Issues:
+//  [ ] Platform: GLUT is unable to distinguish e.g. Backspace from CTRL+H or TAB from CTRL+I
+//  [ ] Platform: Missing mouse cursor shape/visibility support.
+//  [ ] Platform: Missing clipboard support (not supported by Glut).
+//  [ ] Platform: Missing gamepad support.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+IMGUI_IMPL_API bool     ImGui_ImplGLUT_Init();
+IMGUI_IMPL_API void     ImGui_ImplGLUT_InstallFuncs();
+IMGUI_IMPL_API void     ImGui_ImplGLUT_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplGLUT_NewFrame();
+
+// You can call ImGui_ImplGLUT_InstallFuncs() to get all those functions installed automatically,
+// or call them yourself from your own GLUT handlers. We are using the same weird names as GLUT for consistency..
+//---------------------------------------- GLUT name --------------------------------------------- Decent Name ---------
+IMGUI_IMPL_API void     ImGui_ImplGLUT_ReshapeFunc(int w, int h);                           // ~ ResizeFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_MotionFunc(int x, int y);                            // ~ MouseMoveFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_MouseFunc(int button, int state, int x, int y);      // ~ MouseButtonFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_MouseWheelFunc(int button, int dir, int x, int y);   // ~ MouseWheelFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_KeyboardFunc(unsigned char c, int x, int y);         // ~ CharPressedFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_KeyboardUpFunc(unsigned char c, int x, int y);       // ~ CharReleasedFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_SpecialFunc(int key, int x, int y);                  // ~ KeyPressedFunc
+IMGUI_IMPL_API void     ImGui_ImplGLUT_SpecialUpFunc(int key, int x, int y);                // ~ KeyReleasedFunc

extern/imgui_patched/backends/imgui_impl_metal.h

@@ -0,0 +1,68 @@
+// dear imgui: Renderer Backend for Metal
+// This needs to be used along with a Platform Backend (e.g. OSX)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#include "imgui.h"      // IMGUI_IMPL_API
+
+//-----------------------------------------------------------------------------
+// ObjC API
+//-----------------------------------------------------------------------------
+
+#ifdef __OBJC__
+
+@class MTLRenderPassDescriptor;
+@protocol MTLDevice, MTLCommandBuffer, MTLRenderCommandEncoder;
+
+IMGUI_IMPL_API bool ImGui_ImplMetal_Init(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_Shutdown();
+IMGUI_IMPL_API void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor* renderPassDescriptor);
+IMGUI_IMPL_API void ImGui_ImplMetal_RenderDrawData(ImDrawData* drawData,
+                                                   id<MTLCommandBuffer> commandBuffer,
+                                                   id<MTLRenderCommandEncoder> commandEncoder);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyFontsTexture();
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyDeviceObjects();
+
+#endif
+
+//-----------------------------------------------------------------------------
+// C++ API
+//-----------------------------------------------------------------------------
+
+// Enable Metal C++ binding support with '#define IMGUI_IMPL_METAL_CPP' in your imconfig.h file
+// More info about using Metal from C++: https://developer.apple.com/metal/cpp/
+
+#ifdef IMGUI_IMPL_METAL_CPP
+
+#include <Metal/Metal.hpp>
+
+#ifndef __OBJC__
+
+IMGUI_IMPL_API bool ImGui_ImplMetal_Init(MTL::Device* device);
+IMGUI_IMPL_API void ImGui_ImplMetal_Shutdown();
+IMGUI_IMPL_API void ImGui_ImplMetal_NewFrame(MTL::RenderPassDescriptor* renderPassDescriptor);
+IMGUI_IMPL_API void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data,
+                                                   MTL::CommandBuffer* commandBuffer,
+                                                   MTL::RenderCommandEncoder* commandEncoder);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateFontsTexture(MTL::Device* device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyFontsTexture();
+IMGUI_IMPL_API bool ImGui_ImplMetal_CreateDeviceObjects(MTL::Device* device);
+IMGUI_IMPL_API void ImGui_ImplMetal_DestroyDeviceObjects();
+
+#endif
+
+#endif

extern/imgui_patched/backends/imgui_impl_metal.mm

@@ -0,0 +1,722 @@
+// dear imgui: Renderer Backend for Metal
+// This needs to be used along with a Platform Backend (e.g. OSX)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'MTLTexture' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Metal: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-04-27: Misc: Store backend data in a per-context struct, allowing to use this backend with multiple contexts.
+//  2022-01-03: Metal: Ignore ImDrawCmd where ElemCount == 0 (very rare but can technically be manufactured by user code).
+//  2021-12-30: Metal: Added Metal C++ support. Enable with '#define IMGUI_IMPL_METAL_CPP' in your imconfig.h file.
+//  2021-08-24: Metal: Fixed a crash when clipping rect larger than framebuffer is submitted. (#4464)
+//  2021-05-19: Metal: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-02-18: Metal: Change blending equation to preserve alpha in output buffer.
+//  2021-01-25: Metal: Fixed texture storage mode when building on Mac Catalyst.
+//  2019-05-29: Metal: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: Metal: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2019-02-11: Metal: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-07-05: Metal: Added new Metal backend implementation.
+
+#include "imgui.h"
+#include "imgui_impl_metal.h"
+#import <time.h>
+#import <Metal/Metal.h>
+
+// Forward Declarations
+static void ImGui_ImplMetal_InitPlatformInterface();
+static void ImGui_ImplMetal_ShutdownPlatformInterface();
+static void ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows();
+static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
+
+#pragma mark - Support classes
+
+// A wrapper around a MTLBuffer object that knows the last time it was reused
+@interface MetalBuffer : NSObject
+@property (nonatomic, strong) id<MTLBuffer> buffer;
+@property (nonatomic, assign) double        lastReuseTime;
+- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer;
+@end
+
+// An object that encapsulates the data necessary to uniquely identify a
+// render pipeline state. These are used as cache keys.
+@interface FramebufferDescriptor : NSObject<NSCopying>
+@property (nonatomic, assign) unsigned long  sampleCount;
+@property (nonatomic, assign) MTLPixelFormat colorPixelFormat;
+@property (nonatomic, assign) MTLPixelFormat depthPixelFormat;
+@property (nonatomic, assign) MTLPixelFormat stencilPixelFormat;
+- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor*)renderPassDescriptor;
+@end
+
+// A singleton that stores long-lived objects that are needed by the Metal
+// renderer backend. Stores the render pipeline state cache and the default
+// font texture, and manages the reusable buffer cache.
+@interface MetalContext : NSObject
+@property (nonatomic, strong) id<MTLDevice>                 device;
+@property (nonatomic, strong) id<MTLDepthStencilState>      depthStencilState;
+@property (nonatomic, strong) FramebufferDescriptor*        framebufferDescriptor; // framebuffer descriptor for current frame; transient
+@property (nonatomic, strong) NSMutableDictionary*          renderPipelineStateCache; // pipeline cache; keyed on framebuffer descriptors
+@property (nonatomic, strong, nullable) id<MTLTexture>      fontTexture;
+@property (nonatomic, strong) NSMutableArray<MetalBuffer*>* bufferCache;
+@property (nonatomic, assign) double                        lastBufferCachePurge;
+- (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device;
+- (id<MTLRenderPipelineState>)renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor*)descriptor device:(id<MTLDevice>)device;
+@end
+
+struct ImGui_ImplMetal_Data
+{
+    MetalContext*            SharedMetalContext;
+
+    ImGui_ImplMetal_Data()  { memset(this, 0, sizeof(*this)); }
+};
+
+static ImGui_ImplMetal_Data*     ImGui_ImplMetal_CreateBackendData()  { return IM_NEW(ImGui_ImplMetal_Data)(); }
+static ImGui_ImplMetal_Data*     ImGui_ImplMetal_GetBackendData()     { return ImGui::GetCurrentContext() ? (ImGui_ImplMetal_Data*)ImGui::GetIO().BackendRendererUserData : NULL; }
+static void                      ImGui_ImplMetal_DestroyBackendData() { IM_DELETE(ImGui_ImplMetal_GetBackendData()); }
+
+static inline CFTimeInterval     GetMachAbsoluteTimeInSeconds()       { return static_cast<CFTimeInterval>(static_cast<double>(clock_gettime_nsec_np(CLOCK_UPTIME_RAW)) / 1e9); }
+
+#ifdef IMGUI_IMPL_METAL_CPP
+
+#pragma mark - Dear ImGui Metal C++ Backend API
+
+bool ImGui_ImplMetal_Init(MTL::Device* device)
+{
+    return ImGui_ImplMetal_Init((id<MTLDevice>)(device));
+}
+
+void ImGui_ImplMetal_NewFrame(MTL::RenderPassDescriptor* renderPassDescriptor)
+{
+    ImGui_ImplMetal_NewFrame((MTLRenderPassDescriptor*)(renderPassDescriptor));
+}
+
+void ImGui_ImplMetal_RenderDrawData(ImDrawData* draw_data,
+                                    MTL::CommandBuffer* commandBuffer,
+                                    MTL::RenderCommandEncoder* commandEncoder)
+{
+    ImGui_ImplMetal_RenderDrawData(draw_data,
+                                   (id<MTLCommandBuffer>)(commandBuffer),
+                                   (id<MTLRenderCommandEncoder>)(commandEncoder));
+
+}
+
+bool ImGui_ImplMetal_CreateFontsTexture(MTL::Device* device)
+{
+    return ImGui_ImplMetal_CreateFontsTexture((id<MTLDevice>)(device));
+}
+
+bool ImGui_ImplMetal_CreateDeviceObjects(MTL::Device* device)
+{
+    return ImGui_ImplMetal_CreateDeviceObjects((id<MTLDevice>)(device));
+}
+
+#endif // #ifdef IMGUI_IMPL_METAL_CPP
+
+#pragma mark - Dear ImGui Metal Backend API
+
+bool ImGui_ImplMetal_Init(id<MTLDevice> device)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_CreateBackendData();
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_metal";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    bd->SharedMetalContext = [[MetalContext alloc] init];
+    bd->SharedMetalContext.device = device;
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplMetal_InitPlatformInterface();
+
+    return true;
+}
+
+void ImGui_ImplMetal_Shutdown()
+{
+    ImGui_ImplMetal_ShutdownPlatformInterface();
+    ImGui_ImplMetal_DestroyDeviceObjects();
+    ImGui_ImplMetal_DestroyBackendData();
+}
+
+void ImGui_ImplMetal_NewFrame(MTLRenderPassDescriptor* renderPassDescriptor)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    IM_ASSERT(bd->SharedMetalContext != nil && "No Metal context. Did you call ImGui_ImplMetal_Init() ?");
+    bd->SharedMetalContext.framebufferDescriptor = [[FramebufferDescriptor alloc] initWithRenderPassDescriptor:renderPassDescriptor];
+
+    if (bd->SharedMetalContext.depthStencilState == nil)
+        ImGui_ImplMetal_CreateDeviceObjects(bd->SharedMetalContext.device);
+}
+
+static void ImGui_ImplMetal_SetupRenderState(ImDrawData* drawData, id<MTLCommandBuffer> commandBuffer,
+    id<MTLRenderCommandEncoder> commandEncoder, id<MTLRenderPipelineState> renderPipelineState,
+    MetalBuffer* vertexBuffer, size_t vertexBufferOffset)
+{
+    IM_UNUSED(commandBuffer);
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    [commandEncoder setCullMode:MTLCullModeNone];
+    [commandEncoder setDepthStencilState:bd->SharedMetalContext.depthStencilState];
+
+    // Setup viewport, orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to
+    // draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayMin is typically (0,0) for single viewport apps.
+    MTLViewport viewport =
+    {
+        .originX = 0.0,
+        .originY = 0.0,
+        .width = (double)(drawData->DisplaySize.x * drawData->FramebufferScale.x),
+        .height = (double)(drawData->DisplaySize.y * drawData->FramebufferScale.y),
+        .znear = 0.0,
+        .zfar = 1.0
+    };
+    [commandEncoder setViewport:viewport];
+
+    float L = drawData->DisplayPos.x;
+    float R = drawData->DisplayPos.x + drawData->DisplaySize.x;
+    float T = drawData->DisplayPos.y;
+    float B = drawData->DisplayPos.y + drawData->DisplaySize.y;
+    float N = (float)viewport.znear;
+    float F = (float)viewport.zfar;
+    const float ortho_projection[4][4] =
+    {
+        { 2.0f/(R-L),   0.0f,           0.0f,   0.0f },
+        { 0.0f,         2.0f/(T-B),     0.0f,   0.0f },
+        { 0.0f,         0.0f,        1/(F-N),   0.0f },
+        { (R+L)/(L-R),  (T+B)/(B-T), N/(F-N),   1.0f },
+    };
+    [commandEncoder setVertexBytes:&ortho_projection length:sizeof(ortho_projection) atIndex:1];
+
+    [commandEncoder setRenderPipelineState:renderPipelineState];
+
+    [commandEncoder setVertexBuffer:vertexBuffer.buffer offset:0 atIndex:0];
+    [commandEncoder setVertexBufferOffset:vertexBufferOffset atIndex:0];
+}
+
+// Metal Render function.
+void ImGui_ImplMetal_RenderDrawData(ImDrawData* drawData, id<MTLCommandBuffer> commandBuffer, id<MTLRenderCommandEncoder> commandEncoder)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    MetalContext* ctx = bd->SharedMetalContext;
+
+    // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    int fb_width = (int)(drawData->DisplaySize.x * drawData->FramebufferScale.x);
+    int fb_height = (int)(drawData->DisplaySize.y * drawData->FramebufferScale.y);
+    if (fb_width <= 0 || fb_height <= 0 || drawData->CmdListsCount == 0)
+        return;
+
+    // Try to retrieve a render pipeline state that is compatible with the framebuffer config for this frame
+    // The hit rate for this cache should be very near 100%.
+    id<MTLRenderPipelineState> renderPipelineState = ctx.renderPipelineStateCache[ctx.framebufferDescriptor];
+    if (renderPipelineState == nil)
+    {
+        // No luck; make a new render pipeline state
+        renderPipelineState = [ctx renderPipelineStateForFramebufferDescriptor:ctx.framebufferDescriptor device:commandBuffer.device];
+
+        // Cache render pipeline state for later reuse
+        ctx.renderPipelineStateCache[ctx.framebufferDescriptor] = renderPipelineState;
+    }
+
+    size_t vertexBufferLength = (size_t)drawData->TotalVtxCount * sizeof(ImDrawVert);
+    size_t indexBufferLength = (size_t)drawData->TotalIdxCount * sizeof(ImDrawIdx);
+    MetalBuffer* vertexBuffer = [ctx dequeueReusableBufferOfLength:vertexBufferLength device:commandBuffer.device];
+    MetalBuffer* indexBuffer = [ctx dequeueReusableBufferOfLength:indexBufferLength device:commandBuffer.device];
+
+    ImGui_ImplMetal_SetupRenderState(drawData, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, 0);
+
+    // Will project scissor/clipping rectangles into framebuffer space
+    ImVec2 clip_off = drawData->DisplayPos;         // (0,0) unless using multi-viewports
+    ImVec2 clip_scale = drawData->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
+
+    // Render command lists
+    size_t vertexBufferOffset = 0;
+    size_t indexBufferOffset = 0;
+    for (int n = 0; n < drawData->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = drawData->CmdLists[n];
+
+        memcpy((char*)vertexBuffer.buffer.contents + vertexBufferOffset, cmd_list->VtxBuffer.Data, (size_t)cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
+        memcpy((char*)indexBuffer.buffer.contents + indexBufferOffset, cmd_list->IdxBuffer.Data, (size_t)cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplMetal_SetupRenderState(drawData, commandBuffer, commandEncoder, renderPipelineState, vertexBuffer, vertexBufferOffset);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
+                ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
+
+                // Clamp to viewport as setScissorRect() won't accept values that are off bounds
+                if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
+                if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
+                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+                if (pcmd->ElemCount == 0) // drawIndexedPrimitives() validation doesn't accept this
+                    continue;
+
+                // Apply scissor/clipping rectangle
+                MTLScissorRect scissorRect =
+                {
+                    .x = NSUInteger(clip_min.x),
+                    .y = NSUInteger(clip_min.y),
+                    .width = NSUInteger(clip_max.x - clip_min.x),
+                    .height = NSUInteger(clip_max.y - clip_min.y)
+                };
+                [commandEncoder setScissorRect:scissorRect];
+
+                // Bind texture, Draw
+                if (ImTextureID tex_id = pcmd->GetTexID())
+                    [commandEncoder setFragmentTexture:(__bridge id<MTLTexture>)(tex_id) atIndex:0];
+
+                [commandEncoder setVertexBufferOffset:(vertexBufferOffset + pcmd->VtxOffset * sizeof(ImDrawVert)) atIndex:0];
+                [commandEncoder drawIndexedPrimitives:MTLPrimitiveTypeTriangle
+                                           indexCount:pcmd->ElemCount
+                                            indexType:sizeof(ImDrawIdx) == 2 ? MTLIndexTypeUInt16 : MTLIndexTypeUInt32
+                                          indexBuffer:indexBuffer.buffer
+                                    indexBufferOffset:indexBufferOffset + pcmd->IdxOffset * sizeof(ImDrawIdx)];
+            }
+        }
+
+        vertexBufferOffset += (size_t)cmd_list->VtxBuffer.Size * sizeof(ImDrawVert);
+        indexBufferOffset += (size_t)cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx);
+    }
+
+    [commandBuffer addCompletedHandler:^(id<MTLCommandBuffer>)
+    {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+            [bd->SharedMetalContext.bufferCache addObject:vertexBuffer];
+            [bd->SharedMetalContext.bufferCache addObject:indexBuffer];
+        });
+    }];
+}
+
+bool ImGui_ImplMetal_CreateFontsTexture(id<MTLDevice> device)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    ImGuiIO& io = ImGui::GetIO();
+
+    // We are retrieving and uploading the font atlas as a 4-channels RGBA texture here.
+    // In theory we could call GetTexDataAsAlpha8() and upload a 1-channel texture to save on memory access bandwidth.
+    // However, using a shader designed for 1-channel texture would make it less obvious to use the ImTextureID facility to render users own textures.
+    // You can make that change in your implementation.
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
+    MTLTextureDescriptor* textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm
+                                                                                                 width:(NSUInteger)width
+                                                                                                height:(NSUInteger)height
+                                                                                             mipmapped:NO];
+    textureDescriptor.usage = MTLTextureUsageShaderRead;
+#if TARGET_OS_OSX || TARGET_OS_MACCATALYST
+    textureDescriptor.storageMode = MTLStorageModeManaged;
+#else
+    textureDescriptor.storageMode = MTLStorageModeShared;
+#endif
+    id <MTLTexture> texture = [device newTextureWithDescriptor:textureDescriptor];
+    [texture replaceRegion:MTLRegionMake2D(0, 0, (NSUInteger)width, (NSUInteger)height) mipmapLevel:0 withBytes:pixels bytesPerRow:(NSUInteger)width * 4];
+    bd->SharedMetalContext.fontTexture = texture;
+    io.Fonts->SetTexID((__bridge void*)bd->SharedMetalContext.fontTexture); // ImTextureID == void*
+
+    return (bd->SharedMetalContext.fontTexture != nil);
+}
+
+void ImGui_ImplMetal_DestroyFontsTexture()
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    ImGuiIO& io = ImGui::GetIO();
+    bd->SharedMetalContext.fontTexture = nil;
+    io.Fonts->SetTexID(nullptr);
+}
+
+bool ImGui_ImplMetal_CreateDeviceObjects(id<MTLDevice> device)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    MTLDepthStencilDescriptor* depthStencilDescriptor = [[MTLDepthStencilDescriptor alloc] init];
+    depthStencilDescriptor.depthWriteEnabled = NO;
+    depthStencilDescriptor.depthCompareFunction = MTLCompareFunctionAlways;
+    bd->SharedMetalContext.depthStencilState = [device newDepthStencilStateWithDescriptor:depthStencilDescriptor];
+    ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows();
+    ImGui_ImplMetal_CreateFontsTexture(device);
+
+    return true;
+}
+
+void ImGui_ImplMetal_DestroyDeviceObjects()
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    ImGui_ImplMetal_DestroyFontsTexture();
+    ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows();
+    [bd->SharedMetalContext.renderPipelineStateCache removeAllObjects];
+}
+
+#pragma mark - Multi-viewport support
+
+#import <QuartzCore/CAMetalLayer.h>
+
+#if TARGET_OS_OSX
+#import <Cocoa/Cocoa.h>
+#endif
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the back-end to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+struct ImGuiViewportDataMetal
+{
+    CAMetalLayer*               MetalLayer;
+    id<MTLCommandQueue>         CommandQueue;
+    MTLRenderPassDescriptor*    RenderPassDescriptor;
+    void*                       Handle = NULL;
+    bool                        FirstFrame = true;
+};
+
+static void ImGui_ImplMetal_CreateWindow(ImGuiViewport* viewport)
+{
+    ImGui_ImplMetal_Data* bd = ImGui_ImplMetal_GetBackendData();
+    ImGuiViewportDataMetal* data = IM_NEW(ImGuiViewportDataMetal)();
+    viewport->RendererUserData = data;
+
+    // PlatformHandleRaw should always be a NSWindow*, whereas PlatformHandle might be a higher-level handle (e.g. GLFWWindow*, SDL_Window*).
+    // Some back-ends will leave PlatformHandleRaw NULL, in which case we assume PlatformHandle will contain the NSWindow*.
+    void* handle = viewport->PlatformHandleRaw ? viewport->PlatformHandleRaw : viewport->PlatformHandle;
+    IM_ASSERT(handle != NULL);
+
+    id<MTLDevice> device = [bd->SharedMetalContext.depthStencilState device];
+    CAMetalLayer* layer = [CAMetalLayer layer];
+    layer.device = device;
+    layer.framebufferOnly = YES;
+    layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
+#if TARGET_OS_OSX
+    NSWindow* window = (__bridge NSWindow*)handle;
+    NSView* view = window.contentView;
+    view.layer = layer;
+    view.wantsLayer = YES;
+#endif
+    data->MetalLayer = layer;
+    data->CommandQueue = [device newCommandQueue];
+    data->RenderPassDescriptor = [[MTLRenderPassDescriptor alloc] init];
+    data->Handle = handle;
+}
+
+static void ImGui_ImplMetal_DestroyWindow(ImGuiViewport* viewport)
+{
+    // The main viewport (owned by the application) will always have RendererUserData == NULL since we didn't create the data for it.
+    if (ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData)
+        IM_DELETE(data);
+    viewport->RendererUserData = NULL;
+}
+
+inline static CGSize MakeScaledSize(CGSize size, CGFloat scale)
+{
+    return CGSizeMake(size.width * scale, size.height * scale);
+}
+
+static void ImGui_ImplMetal_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
+{
+    ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData;
+    data->MetalLayer.drawableSize = MakeScaledSize(CGSizeMake(size.x, size.y), viewport->DpiScale);
+}
+
+static void ImGui_ImplMetal_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    ImGuiViewportDataMetal* data = (ImGuiViewportDataMetal*)viewport->RendererUserData;
+
+#if TARGET_OS_OSX
+    void* handle = viewport->PlatformHandleRaw ? viewport->PlatformHandleRaw : viewport->PlatformHandle;
+    NSWindow* window = (__bridge NSWindow*)handle;
+
+    // Always render the first frame, regardless of occlusionState, to avoid an initial flicker
+    if ((window.occlusionState & NSWindowOcclusionStateVisible) == 0 && !data->FirstFrame)
+    {
+        // Do not render windows which are completely occluded. Calling -[CAMetalLayer nextDrawable] will hang for
+        // approximately 1 second if the Metal layer is completely occluded.
+        return;
+    }
+    data->FirstFrame = false;
+
+    viewport->DpiScale = static_cast<float>(window.backingScaleFactor);
+    if (data->MetalLayer.contentsScale != viewport->DpiScale)
+    {
+        data->MetalLayer.contentsScale = viewport->DpiScale;
+        data->MetalLayer.drawableSize = MakeScaledSize(window.frame.size, viewport->DpiScale);
+    }
+    viewport->DrawData->FramebufferScale = ImVec2(viewport->DpiScale, viewport->DpiScale);
+#endif
+
+    id <CAMetalDrawable> drawable = [data->MetalLayer nextDrawable];
+    if (drawable == nil)
+        return;
+
+    MTLRenderPassDescriptor* renderPassDescriptor = data->RenderPassDescriptor;
+    renderPassDescriptor.colorAttachments[0].texture = drawable.texture;
+    renderPassDescriptor.colorAttachments[0].clearColor = MTLClearColorMake(0, 0, 0, 0);
+    if ((viewport->Flags & ImGuiViewportFlags_NoRendererClear) == 0)
+        renderPassDescriptor.colorAttachments[0].loadAction = MTLLoadActionClear;
+
+    id <MTLCommandBuffer> commandBuffer = [data->CommandQueue commandBuffer];
+    id <MTLRenderCommandEncoder> renderEncoder = [commandBuffer renderCommandEncoderWithDescriptor:renderPassDescriptor];
+    ImGui_ImplMetal_RenderDrawData(viewport->DrawData, commandBuffer, renderEncoder);
+    [renderEncoder endEncoding];
+
+    [commandBuffer presentDrawable:drawable];
+    [commandBuffer commit];
+}
+
+static void ImGui_ImplMetal_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_CreateWindow = ImGui_ImplMetal_CreateWindow;
+    platform_io.Renderer_DestroyWindow = ImGui_ImplMetal_DestroyWindow;
+    platform_io.Renderer_SetWindowSize = ImGui_ImplMetal_SetWindowSize;
+    platform_io.Renderer_RenderWindow = ImGui_ImplMetal_RenderWindow;
+}
+
+static void ImGui_ImplMetal_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}
+
+static void ImGui_ImplMetal_CreateDeviceObjectsForPlatformWindows()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int i = 1; i < platform_io.Viewports.Size; i++)
+        if (!platform_io.Viewports[i]->RendererUserData)
+            ImGui_ImplMetal_CreateWindow(platform_io.Viewports[i]);
+}
+
+static void ImGui_ImplMetal_InvalidateDeviceObjectsForPlatformWindows()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int i = 1; i < platform_io.Viewports.Size; i++)
+        if (platform_io.Viewports[i]->RendererUserData)
+            ImGui_ImplMetal_DestroyWindow(platform_io.Viewports[i]);
+}
+
+#pragma mark - MetalBuffer implementation
+
+@implementation MetalBuffer
+- (instancetype)initWithBuffer:(id<MTLBuffer>)buffer
+{
+    if ((self = [super init]))
+    {
+        _buffer = buffer;
+        _lastReuseTime = GetMachAbsoluteTimeInSeconds();
+    }
+    return self;
+}
+@end
+
+#pragma mark - FramebufferDescriptor implementation
+
+@implementation FramebufferDescriptor
+- (instancetype)initWithRenderPassDescriptor:(MTLRenderPassDescriptor*)renderPassDescriptor
+{
+    if ((self = [super init]))
+    {
+        _sampleCount = renderPassDescriptor.colorAttachments[0].texture.sampleCount;
+        _colorPixelFormat = renderPassDescriptor.colorAttachments[0].texture.pixelFormat;
+        _depthPixelFormat = renderPassDescriptor.depthAttachment.texture.pixelFormat;
+        _stencilPixelFormat = renderPassDescriptor.stencilAttachment.texture.pixelFormat;
+    }
+    return self;
+}
+
+- (nonnull id)copyWithZone:(nullable NSZone*)zone
+{
+    FramebufferDescriptor* copy = [[FramebufferDescriptor allocWithZone:zone] init];
+    copy.sampleCount = self.sampleCount;
+    copy.colorPixelFormat = self.colorPixelFormat;
+    copy.depthPixelFormat = self.depthPixelFormat;
+    copy.stencilPixelFormat = self.stencilPixelFormat;
+    return copy;
+}
+
+- (NSUInteger)hash
+{
+    NSUInteger sc = _sampleCount & 0x3;
+    NSUInteger cf = _colorPixelFormat & 0x3FF;
+    NSUInteger df = _depthPixelFormat & 0x3FF;
+    NSUInteger sf = _stencilPixelFormat & 0x3FF;
+    NSUInteger hash = (sf << 22) | (df << 12) | (cf << 2) | sc;
+    return hash;
+}
+
+- (BOOL)isEqual:(id)object
+{
+    FramebufferDescriptor* other = object;
+    if (![other isKindOfClass:[FramebufferDescriptor class]])
+        return NO;
+    return other.sampleCount == self.sampleCount      &&
+    other.colorPixelFormat   == self.colorPixelFormat &&
+    other.depthPixelFormat   == self.depthPixelFormat &&
+    other.stencilPixelFormat == self.stencilPixelFormat;
+}
+
+@end
+
+#pragma mark - MetalContext implementation
+
+@implementation MetalContext
+- (instancetype)init
+{
+    if ((self = [super init]))
+    {
+        _renderPipelineStateCache = [NSMutableDictionary dictionary];
+        _bufferCache = [NSMutableArray array];
+        _lastBufferCachePurge = GetMachAbsoluteTimeInSeconds();
+    }
+    return self;
+}
+
+- (MetalBuffer*)dequeueReusableBufferOfLength:(NSUInteger)length device:(id<MTLDevice>)device
+{
+    uint64_t now = GetMachAbsoluteTimeInSeconds();
+
+    // Purge old buffers that haven't been useful for a while
+    if (now - self.lastBufferCachePurge > 1.0)
+    {
+        NSMutableArray* survivors = [NSMutableArray array];
+        for (MetalBuffer* candidate in self.bufferCache)
+            if (candidate.lastReuseTime > self.lastBufferCachePurge)
+                [survivors addObject:candidate];
+        self.bufferCache = [survivors mutableCopy];
+        self.lastBufferCachePurge = now;
+    }
+
+    // See if we have a buffer we can reuse
+    MetalBuffer* bestCandidate = nil;
+    for (MetalBuffer* candidate in self.bufferCache)
+        if (candidate.buffer.length >= length && (bestCandidate == nil || bestCandidate.lastReuseTime > candidate.lastReuseTime))
+            bestCandidate = candidate;
+
+    if (bestCandidate != nil)
+    {
+        [self.bufferCache removeObject:bestCandidate];
+        bestCandidate.lastReuseTime = now;
+        return bestCandidate;
+    }
+
+    // No luck; make a new buffer
+    id<MTLBuffer> backing = [device newBufferWithLength:length options:MTLResourceStorageModeShared];
+    return [[MetalBuffer alloc] initWithBuffer:backing];
+}
+
+// Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling.
+- (id<MTLRenderPipelineState>)renderPipelineStateForFramebufferDescriptor:(FramebufferDescriptor*)descriptor device:(id<MTLDevice>)device
+{
+    NSError* error = nil;
+
+    NSString* shaderSource = @""
+    "#include <metal_stdlib>\n"
+    "using namespace metal;\n"
+    "\n"
+    "struct Uniforms {\n"
+    "    float4x4 projectionMatrix;\n"
+    "};\n"
+    "\n"
+    "struct VertexIn {\n"
+    "    float2 position  [[attribute(0)]];\n"
+    "    float2 texCoords [[attribute(1)]];\n"
+    "    uchar4 color     [[attribute(2)]];\n"
+    "};\n"
+    "\n"
+    "struct VertexOut {\n"
+    "    float4 position [[position]];\n"
+    "    float2 texCoords;\n"
+    "    float4 color;\n"
+    "};\n"
+    "\n"
+    "vertex VertexOut vertex_main(VertexIn in                 [[stage_in]],\n"
+    "                             constant Uniforms &uniforms [[buffer(1)]]) {\n"
+    "    VertexOut out;\n"
+    "    out.position = uniforms.projectionMatrix * float4(in.position, 0, 1);\n"
+    "    out.texCoords = in.texCoords;\n"
+    "    out.color = float4(in.color) / float4(255.0);\n"
+    "    return out;\n"
+    "}\n"
+    "\n"
+    "fragment half4 fragment_main(VertexOut in [[stage_in]],\n"
+    "                             texture2d<half, access::sample> texture [[texture(0)]]) {\n"
+    "    constexpr sampler linearSampler(coord::normalized, min_filter::linear, mag_filter::linear, mip_filter::linear);\n"
+    "    half4 texColor = texture.sample(linearSampler, in.texCoords);\n"
+    "    return half4(in.color) * texColor;\n"
+    "}\n";
+
+    id<MTLLibrary> library = [device newLibraryWithSource:shaderSource options:nil error:&error];
+    if (library == nil)
+    {
+        NSLog(@"Error: failed to create Metal library: %@", error);
+        return nil;
+    }
+
+    id<MTLFunction> vertexFunction = [library newFunctionWithName:@"vertex_main"];
+    id<MTLFunction> fragmentFunction = [library newFunctionWithName:@"fragment_main"];
+
+    if (vertexFunction == nil || fragmentFunction == nil)
+    {
+        NSLog(@"Error: failed to find Metal shader functions in library: %@", error);
+        return nil;
+    }
+
+    MTLVertexDescriptor* vertexDescriptor = [MTLVertexDescriptor vertexDescriptor];
+    vertexDescriptor.attributes[0].offset = IM_OFFSETOF(ImDrawVert, pos);
+    vertexDescriptor.attributes[0].format = MTLVertexFormatFloat2; // position
+    vertexDescriptor.attributes[0].bufferIndex = 0;
+    vertexDescriptor.attributes[1].offset = IM_OFFSETOF(ImDrawVert, uv);
+    vertexDescriptor.attributes[1].format = MTLVertexFormatFloat2; // texCoords
+    vertexDescriptor.attributes[1].bufferIndex = 0;
+    vertexDescriptor.attributes[2].offset = IM_OFFSETOF(ImDrawVert, col);
+    vertexDescriptor.attributes[2].format = MTLVertexFormatUChar4; // color
+    vertexDescriptor.attributes[2].bufferIndex = 0;
+    vertexDescriptor.layouts[0].stepRate = 1;
+    vertexDescriptor.layouts[0].stepFunction = MTLVertexStepFunctionPerVertex;
+    vertexDescriptor.layouts[0].stride = sizeof(ImDrawVert);
+
+    MTLRenderPipelineDescriptor* pipelineDescriptor = [[MTLRenderPipelineDescriptor alloc] init];
+    pipelineDescriptor.vertexFunction = vertexFunction;
+    pipelineDescriptor.fragmentFunction = fragmentFunction;
+    pipelineDescriptor.vertexDescriptor = vertexDescriptor;
+    pipelineDescriptor.sampleCount = self.framebufferDescriptor.sampleCount;
+    pipelineDescriptor.colorAttachments[0].pixelFormat = self.framebufferDescriptor.colorPixelFormat;
+    pipelineDescriptor.colorAttachments[0].blendingEnabled = YES;
+    pipelineDescriptor.colorAttachments[0].rgbBlendOperation = MTLBlendOperationAdd;
+    pipelineDescriptor.colorAttachments[0].sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
+    pipelineDescriptor.colorAttachments[0].destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
+    pipelineDescriptor.colorAttachments[0].alphaBlendOperation = MTLBlendOperationAdd;
+    pipelineDescriptor.colorAttachments[0].sourceAlphaBlendFactor = MTLBlendFactorOne;
+    pipelineDescriptor.colorAttachments[0].destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
+    pipelineDescriptor.depthAttachmentPixelFormat = self.framebufferDescriptor.depthPixelFormat;
+    pipelineDescriptor.stencilAttachmentPixelFormat = self.framebufferDescriptor.stencilPixelFormat;
+
+    id<MTLRenderPipelineState> renderPipelineState = [device newRenderPipelineStateWithDescriptor:pipelineDescriptor error:&error];
+    if (error != nil)
+        NSLog(@"Error: failed to create Metal pipeline state: %@", error);
+
+    return renderPipelineState;
+}
+
+@end

extern/imgui_patched/backends/imgui_impl_opengl2.cpp

@@ -0,0 +1,325 @@
+// dear imgui: Renderer Backend for OpenGL2 (legacy OpenGL, fixed pipeline)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
+// **Prefer using the code in imgui_impl_opengl3.cpp**
+// This code is mostly provided as a reference to learn how ImGui integration works, because it is shorter to read.
+// If your code is using GL3+ context or any semi modern OpenGL calls, using this is likely to make everything more
+// complicated, will require your code to reset every single OpenGL attributes to their initial state, and might
+// confuse your GPU driver.
+// The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2021-12-08: OpenGL: Fixed mishandling of the the ImDrawCmd::IdxOffset field! This is an old bug but it never had an effect until some internal rendering changes in 1.86.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-01-03: OpenGL: Backup, setup and restore GL_SHADE_MODEL state, disable GL_STENCIL_TEST and disable GL_NORMAL_ARRAY client state to increase compatibility with legacy OpenGL applications.
+//  2020-01-23: OpenGL: Backup, setup and restore GL_TEXTURE_ENV to increase compatibility with legacy OpenGL applications.
+//  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-08-03: OpenGL: Disabling/restoring GL_LIGHTING and GL_COLOR_MATERIAL to increase compatibility with legacy OpenGL applications.
+//  2018-06-08: Misc: Extracted imgui_impl_opengl2.cpp/.h away from the old combined GLFW/SDL+OpenGL2 examples.
+//  2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplOpenGL2_RenderDrawData() in the .h file so you can call it yourself.
+//  2017-09-01: OpenGL: Save and restore current polygon mode.
+//  2016-09-10: OpenGL: Uploading font texture as RGBA32 to increase compatibility with users shaders (not ideal).
+//  2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle.
+
+#include "imgui.h"
+#include "imgui_impl_opengl2.h"
+#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
+#include <stddef.h>     // intptr_t
+#else
+#include <stdint.h>     // intptr_t
+#endif
+
+// Include OpenGL header (without an OpenGL loader) requires a bit of fiddling
+#if defined(_WIN32) && !defined(APIENTRY)
+#define APIENTRY __stdcall                  // It is customary to use APIENTRY for OpenGL function pointer declarations on all platforms.  Additionally, the Windows OpenGL header needs APIENTRY.
+#endif
+#if defined(_WIN32) && !defined(WINGDIAPI)
+#define WINGDIAPI __declspec(dllimport)     // Some Windows OpenGL headers need this
+#endif
+#if defined(__APPLE__)
+#define GL_SILENCE_DEPRECATION
+#include <OpenGL/gl.h>
+#else
+#include <GL/gl.h>
+#endif
+
+struct ImGui_ImplOpenGL2_Data
+{
+    GLuint       FontTexture;
+
+    ImGui_ImplOpenGL2_Data() { memset((void*)this, 0, sizeof(*this)); }
+};
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplOpenGL2_Data* ImGui_ImplOpenGL2_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL2_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Forward Declarations
+static void ImGui_ImplOpenGL2_InitPlatformInterface();
+static void ImGui_ImplOpenGL2_ShutdownPlatformInterface();
+
+// Functions
+bool    ImGui_ImplOpenGL2_Init()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplOpenGL2_Data* bd = IM_NEW(ImGui_ImplOpenGL2_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_opengl2";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;    // We can create multi-viewports on the Renderer side (optional)
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplOpenGL2_InitPlatformInterface();
+
+    return true;
+}
+
+void    ImGui_ImplOpenGL2_Shutdown()
+{
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplOpenGL2_ShutdownPlatformInterface();
+    ImGui_ImplOpenGL2_DestroyDeviceObjects();
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+void    ImGui_ImplOpenGL2_NewFrame()
+{
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplOpenGL2_Init()?");
+
+    if (!bd->FontTexture)
+        ImGui_ImplOpenGL2_CreateDeviceObjects();
+}
+
+static void ImGui_ImplOpenGL2_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height)
+{
+    // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, vertex/texcoord/color pointers, polygon fill.
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    //glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA); // In order to composite our output buffer we need to preserve alpha
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_STENCIL_TEST);
+    glDisable(GL_LIGHTING);
+    glDisable(GL_COLOR_MATERIAL);
+    glEnable(GL_SCISSOR_TEST);
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glEnableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_NORMAL_ARRAY);
+    glEnable(GL_TEXTURE_2D);
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    glShadeModel(GL_SMOOTH);
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+    // If you are using this code with non-legacy OpenGL header/contexts (which you should not, prefer using imgui_impl_opengl3.cpp!!),
+    // you may need to backup/reset/restore other state, e.g. for current shader using the commented lines below.
+    // (DO NOT MODIFY THIS FILE! Add the code in your calling function)
+    //   GLint last_program;
+    //   glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
+    //   glUseProgram(0);
+    //   ImGui_ImplOpenGL2_RenderDrawData(...);
+    //   glUseProgram(last_program)
+    // There are potentially many more states you could need to clear/setup that we can't access from default headers.
+    // e.g. glBindBuffer(GL_ARRAY_BUFFER, 0), glDisable(GL_TEXTURE_CUBE_MAP).
+
+    // Setup viewport, orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    glLoadIdentity();
+    glOrtho(draw_data->DisplayPos.x, draw_data->DisplayPos.x + draw_data->DisplaySize.x, draw_data->DisplayPos.y + draw_data->DisplaySize.y, draw_data->DisplayPos.y, -1.0f, +1.0f);
+    glMatrixMode(GL_MODELVIEW);
+    glPushMatrix();
+    glLoadIdentity();
+}
+
+// OpenGL2 Render function.
+// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
+// This is in order to be able to run within an OpenGL engine that doesn't do so.
+void ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
+    int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
+    if (fb_width == 0 || fb_height == 0)
+        return;
+
+    // Backup GL state
+    GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
+    GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
+    GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
+    GLint last_shade_model; glGetIntegerv(GL_SHADE_MODEL, &last_shade_model);
+    GLint last_tex_env_mode; glGetTexEnviv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, &last_tex_env_mode);
+    glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT | GL_TRANSFORM_BIT);
+
+    // Setup desired GL state
+    ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
+
+    // Will project scissor/clipping rectangles into framebuffer space
+    ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
+    ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
+
+    // Render command lists
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        const ImDrawVert* vtx_buffer = cmd_list->VtxBuffer.Data;
+        const ImDrawIdx* idx_buffer = cmd_list->IdxBuffer.Data;
+        glVertexPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, pos)));
+        glTexCoordPointer(2, GL_FLOAT, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, uv)));
+        glColorPointer(4, GL_UNSIGNED_BYTE, sizeof(ImDrawVert), (const GLvoid*)((const char*)vtx_buffer + IM_OFFSETOF(ImDrawVert, col)));
+
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplOpenGL2_SetupRenderState(draw_data, fb_width, fb_height);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
+                ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle (Y is inverted in OpenGL)
+                glScissor((int)clip_min.x, (int)(fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y));
+
+                // Bind texture, Draw
+                glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());
+                glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer + pcmd->IdxOffset);
+            }
+        }
+    }
+
+    // Restore modified GL state
+    glDisableClientState(GL_COLOR_ARRAY);
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    glDisableClientState(GL_VERTEX_ARRAY);
+    glBindTexture(GL_TEXTURE_2D, (GLuint)last_texture);
+    glMatrixMode(GL_MODELVIEW);
+    glPopMatrix();
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+    glPopAttrib();
+    glPolygonMode(GL_FRONT, (GLenum)last_polygon_mode[0]); glPolygonMode(GL_BACK, (GLenum)last_polygon_mode[1]);
+    glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
+    glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
+    glShadeModel(last_shade_model);
+    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, last_tex_env_mode);
+}
+
+bool ImGui_ImplOpenGL2_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
+
+    // Upload texture to graphics system
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    GLint last_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    glGenTextures(1, &bd->FontTexture);
+    glBindTexture(GL_TEXTURE_2D, bd->FontTexture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture);
+
+    // Restore state
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+
+    return true;
+}
+
+void ImGui_ImplOpenGL2_DestroyFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplOpenGL2_Data* bd = ImGui_ImplOpenGL2_GetBackendData();
+    if (bd->FontTexture)
+    {
+        glDeleteTextures(1, &bd->FontTexture);
+        io.Fonts->SetTexID(0);
+        bd->FontTexture = 0;
+    }
+}
+
+bool    ImGui_ImplOpenGL2_CreateDeviceObjects()
+{
+    return ImGui_ImplOpenGL2_CreateFontsTexture();
+}
+
+void    ImGui_ImplOpenGL2_DestroyDeviceObjects()
+{
+    ImGui_ImplOpenGL2_DestroyFontsTexture();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+static void ImGui_ImplOpenGL2_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+    {
+        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+    ImGui_ImplOpenGL2_RenderDrawData(viewport->DrawData);
+}
+
+static void ImGui_ImplOpenGL2_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL2_RenderWindow;
+}
+
+static void ImGui_ImplOpenGL2_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}

extern/imgui_patched/backends/imgui_impl_opengl2.h

@@ -0,0 +1,33 @@
+// dear imgui: Renderer Backend for OpenGL2 (legacy OpenGL, fixed pipeline)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// **DO NOT USE THIS CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)**
+// **Prefer using the code in imgui_impl_opengl3.cpp**
+// This code is mostly provided as a reference to learn how ImGui integration works, because it is shorter to read.
+// If your code is using GL3+ context or any semi modern OpenGL calls, using this is likely to make everything more
+// complicated, will require your code to reset every single OpenGL attributes to their initial state, and might
+// confuse your GPU driver.
+// The GL2 code is unable to reset attributes or even call e.g. "glUseProgram(0)" because they don't exist in that API.
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_Init();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_RenderDrawData(ImDrawData* draw_data);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateFontsTexture();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyFontsTexture();
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL2_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL2_DestroyDeviceObjects();

extern/imgui_patched/backends/imgui_impl_opengl3.cpp

@@ -0,0 +1,889 @@
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
+// - Desktop GL: 2.x 3.x 4.x
+// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [x] Renderer: Large meshes support (64k+ vertices) with 16-bit indices (Desktop OpenGL only).
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-05-13: OpenGL: Fix state corruption on OpenGL ES 2.0 due to not preserving GL_ELEMENT_ARRAY_BUFFER_BINDING and vertex attribute states.
+//  2021-12-15: OpenGL: Using buffer orphaning + glBufferSubData(), seems to fix leaks with multi-viewports with some Intel HD drivers.
+//  2021-08-23: OpenGL: Fixed ES 3.0 shader ("#version 300 es") use normal precision floats to avoid wobbly rendering at HD resolutions.
+//  2021-08-19: OpenGL: Embed and use our own minimal GL loader (imgui_impl_opengl3_loader.h), removing requirement and support for third-party loader.
+//  2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX).
+//  2021-06-25: OpenGL: Use OES_vertex_array extension on Emscripten + backup/restore current state.
+//  2021-06-21: OpenGL: Destroy individual vertex/fragment shader objects right after they are linked into the main shader.
+//  2021-05-24: OpenGL: Access GL_CLIP_ORIGIN when "GL_ARB_clip_control" extension is detected, inside of just OpenGL 4.5 version.
+//  2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-04-06: OpenGL: Don't try to read GL_CLIP_ORIGIN unless we're OpenGL 4.5 or greater.
+//  2021-02-18: OpenGL: Change blending equation to preserve alpha in output buffer.
+//  2021-01-03: OpenGL: Backup, setup and restore GL_STENCIL_TEST state.
+//  2020-10-23: OpenGL: Backup, setup and restore GL_PRIMITIVE_RESTART state.
+//  2020-10-15: OpenGL: Use glGetString(GL_VERSION) instead of glGetIntegerv(GL_MAJOR_VERSION, ...) when the later returns zero (e.g. Desktop GL 2.x)
+//  2020-09-17: OpenGL: Fix to avoid compiling/calling glBindSampler() on ES or pre 3.3 context which have the defines set by a loader.
+//  2020-07-10: OpenGL: Added support for glad2 OpenGL loader.
+//  2020-05-08: OpenGL: Made default GLSL version 150 (instead of 130) on OSX.
+//  2020-04-21: OpenGL: Fixed handling of glClipControl(GL_UPPER_LEFT) by inverting projection matrix.
+//  2020-04-12: OpenGL: Fixed context version check mistakenly testing for 4.0+ instead of 3.2+ to enable ImGuiBackendFlags_RendererHasVtxOffset.
+//  2020-03-24: OpenGL: Added support for glbinding 2.x OpenGL loader.
+//  2020-01-07: OpenGL: Added support for glbinding 3.x OpenGL loader.
+//  2019-10-25: OpenGL: Using a combination of GL define and runtime GL version to decide whether to use glDrawElementsBaseVertex(). Fix building with pre-3.2 GL loaders.
+//  2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility.
+//  2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call.
+//  2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2019-03-29: OpenGL: Not calling glBindBuffer more than necessary in the render loop.
+//  2019-03-15: OpenGL: Added a GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized GL function loaders early.
+//  2019-03-03: OpenGL: Fix support for ES 2.0 (WebGL 1.0).
+//  2019-02-20: OpenGL: Fix for OSX not supporting OpenGL 4.5, we don't try to read GL_CLIP_ORIGIN even if defined by the headers/loader.
+//  2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
+//  2019-02-01: OpenGL: Using GLSL 410 shaders for any version over 410 (e.g. 430, 450).
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-11-13: OpenGL: Support for GL 4.5's glClipControl(GL_UPPER_LEFT) / GL_CLIP_ORIGIN.
+//  2018-08-29: OpenGL: Added support for more OpenGL loaders: glew and glad, with comments indicative that any loader can be used.
+//  2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES".
+//  2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation.
+//  2018-07-10: OpenGL: Support for more GLSL versions (based on the GLSL version string). Added error output when shaders fail to compile/link.
+//  2018-06-08: Misc: Extracted imgui_impl_opengl3.cpp/.h away from the old combined GLFW/SDL+OpenGL3 examples.
+//  2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-05-25: OpenGL: Removed unnecessary backup/restore of GL_ELEMENT_ARRAY_BUFFER_BINDING since this is part of the VAO state.
+//  2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a NULL pointer.
+//  2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplOpenGL3_Init() so user can override the GLSL version e.g. "#version 150".
+//  2018-02-23: OpenGL: Create the VAO in the render function so the setup can more easily be used with multiple shared GL context.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-01-07: OpenGL: Changed GLSL shader version from 330 to 150.
+//  2017-09-01: OpenGL: Save and restore current bound sampler. Save and restore current polygon mode.
+//  2017-05-01: OpenGL: Fixed save and restore of current blend func state.
+//  2017-05-01: OpenGL: Fixed save and restore of current GL_ACTIVE_TEXTURE.
+//  2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle.
+//  2016-07-29: OpenGL: Explicitly setting GL_UNPACK_ROW_LENGTH to reduce issues because SDL changes it. (#752)
+
+//----------------------------------------
+// OpenGL    GLSL      GLSL
+// version   version   string
+//----------------------------------------
+//  2.0       110       "#version 110"
+//  2.1       120       "#version 120"
+//  3.0       130       "#version 130"
+//  3.1       140       "#version 140"
+//  3.2       150       "#version 150"
+//  3.3       330       "#version 330 core"
+//  4.0       400       "#version 400 core"
+//  4.1       410       "#version 410 core"
+//  4.2       420       "#version 410 core"
+//  4.3       430       "#version 430 core"
+//  ES 2.0    100       "#version 100"      = WebGL 1.0
+//  ES 3.0    300       "#version 300 es"   = WebGL 2.0
+//----------------------------------------
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include "imgui.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
+#include <stddef.h>     // intptr_t
+#else
+#include <stdint.h>     // intptr_t
+#endif
+
+// Clang warnings with -Weverything
+#if defined(__clang__)
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wold-style-cast"     // warning: use of old-style cast
+#pragma clang diagnostic ignored "-Wsign-conversion"    // warning: implicit conversion changes signedness
+#if __has_warning("-Wzero-as-null-pointer-constant")
+#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
+#endif
+#endif
+
+// GL includes
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV))
+#include <OpenGLES/ES2/gl.h>    // Use GL ES 2
+#else
+#include <GLES2/gl2.h>          // Use GL ES 2
+#endif
+#if defined(__EMSCRIPTEN__)
+#ifndef GL_GLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+#endif
+#include <GLES2/gl2ext.h>
+#endif
+#elif defined(IMGUI_IMPL_OPENGL_ES3)
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV))
+#include <OpenGLES/ES3/gl.h>    // Use GL ES 3
+#else
+#include <GLES3/gl3.h>          // Use GL ES 3
+#endif
+#elif !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
+// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
+// Helper libraries are often used for this purpose! Here we are using our own minimal custom loader based on gl3w.
+// In the rest of your app/engine, you can use another loader of your choice (gl3w, glew, glad, glbinding, glext, glLoadGen, etc.).
+// If you happen to be developing a new feature for this backend (imgui_impl_opengl3.cpp):
+// - You may need to regenerate imgui_impl_opengl3_loader.h to add new symbols. See https://github.com/dearimgui/gl3w_stripped
+// - You can temporarily use an unstripped version. See https://github.com/dearimgui/gl3w_stripped/releases
+// Changes to this backend using new APIs should be accompanied by a regenerated stripped loader version.
+#define IMGL3W_IMPL
+#include "imgui_impl_opengl3_loader.h"
+#endif
+
+// Vertex arrays are not supported on ES2/WebGL1 unless Emscripten which uses an extension
+#ifndef IMGUI_IMPL_OPENGL_ES2
+#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+#elif defined(__EMSCRIPTEN__)
+#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+#define glBindVertexArray       glBindVertexArrayOES
+#define glGenVertexArrays       glGenVertexArraysOES
+#define glDeleteVertexArrays    glDeleteVertexArraysOES
+#define GL_VERTEX_ARRAY_BINDING GL_VERTEX_ARRAY_BINDING_OES
+#endif
+
+// Desktop GL 2.0+ has glPolygonMode() which GL ES and WebGL don't have.
+#ifdef GL_POLYGON_MODE
+#define IMGUI_IMPL_HAS_POLYGON_MODE
+#endif
+
+// Desktop GL 3.2+ has glDrawElementsBaseVertex() which GL ES and WebGL don't have.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_2)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+#endif
+
+// Desktop GL 3.3+ has glBindSampler()
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_3)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+#endif
+
+// Desktop GL 3.1+ has GL_PRIMITIVE_RESTART state
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_1)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+#endif
+
+// Desktop GL use extension detection
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS
+#endif
+
+// OpenGL Data
+struct ImGui_ImplOpenGL3_Data
+{
+    GLuint          GlVersion;               // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
+    char            GlslVersionString[32];   // Specified by user or detected based on compile time GL settings.
+    GLuint          FontTexture;
+    GLuint          ShaderHandle;
+    GLint           AttribLocationTex;       // Uniforms location
+    GLint           AttribLocationProjMtx;
+    GLuint          AttribLocationVtxPos;    // Vertex attributes location
+    GLuint          AttribLocationVtxUV;
+    GLuint          AttribLocationVtxColor;
+    unsigned int    VboHandle, ElementsHandle;
+    GLsizeiptr      VertexBufferSize;
+    GLsizeiptr      IndexBufferSize;
+    bool            HasClipOrigin;
+
+    ImGui_ImplOpenGL3_Data() { memset((void*)this, 0, sizeof(*this)); }
+};
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Forward Declarations
+static void ImGui_ImplOpenGL3_InitPlatformInterface();
+static void ImGui_ImplOpenGL3_ShutdownPlatformInterface();
+
+// OpenGL vertex attribute state (for ES 1.0 and ES 2.0 only)
+#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+struct ImGui_ImplOpenGL3_VtxAttribState
+{
+    GLint   Enabled, Size, Type, Normalized, Stride;
+    GLvoid* Ptr;
+
+    void GetState(GLint index)
+    {
+        glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_ENABLED, &Enabled);
+        glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_SIZE, &Size);
+        glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_TYPE, &Type);
+        glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_NORMALIZED, &Normalized);
+        glGetVertexAttribiv(index, GL_VERTEX_ATTRIB_ARRAY_STRIDE, &Stride);
+        glGetVertexAttribPointerv(index, GL_VERTEX_ATTRIB_ARRAY_POINTER, &Ptr);
+    }
+    void SetState(GLint index)
+    {
+        glVertexAttribPointer(index, Size, Type, (GLboolean)Normalized, Stride, Ptr);
+        if (Enabled) glEnableVertexAttribArray(index); else glDisableVertexAttribArray(index);
+    }
+};
+#endif
+
+// Functions
+bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+
+    // Initialize our loader
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
+    if (imgl3wInit() != 0)
+    {
+        fprintf(stderr, "Failed to initialize OpenGL loader!\n");
+        return false;
+    }
+#endif
+
+    // Setup backend capabilities flags
+    ImGui_ImplOpenGL3_Data* bd = IM_NEW(ImGui_ImplOpenGL3_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_opengl3";
+
+    // Query for GL version (e.g. 320 for GL 3.2)
+#if !defined(IMGUI_IMPL_OPENGL_ES2)
+    GLint major = 0;
+    GLint minor = 0;
+    glGetIntegerv(GL_MAJOR_VERSION, &major);
+    glGetIntegerv(GL_MINOR_VERSION, &minor);
+    if (major == 0 && minor == 0)
+    {
+        // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
+        const char* gl_version = (const char*)glGetString(GL_VERSION);
+        sscanf(gl_version, "%d.%d", &major, &minor);
+    }
+    bd->GlVersion = (GLuint)(major * 100 + minor * 10);
+#else
+    bd->GlVersion = 200; // GLES 2
+#endif
+
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+    if (bd->GlVersion >= 320)
+        io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+#endif
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    // Store GLSL version string so we can refer to it later in case we recreate shaders.
+    // Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure.
+    if (glsl_version == NULL)
+    {
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+        glsl_version = "#version 100";
+#elif defined(IMGUI_IMPL_OPENGL_ES3)
+        glsl_version = "#version 300 es";
+#elif defined(__APPLE__)
+        glsl_version = "#version 150";
+#else
+        glsl_version = "#version 130";
+#endif
+    }
+    IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(bd->GlslVersionString));
+    strcpy(bd->GlslVersionString, glsl_version);
+    strcat(bd->GlslVersionString, "\n");
+
+    // Make an arbitrary GL call (we don't actually need the result)
+    // IF YOU GET A CRASH HERE: it probably means the OpenGL function loader didn't do its job. Let us know!
+    GLint current_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
+
+    // Detect extensions we support
+    bd->HasClipOrigin = (bd->GlVersion >= 450);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS
+    GLint num_extensions = 0;
+    glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
+    for (GLint i = 0; i < num_extensions; i++)
+    {
+        const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i);
+        if (extension != NULL && strcmp(extension, "GL_ARB_clip_control") == 0)
+            bd->HasClipOrigin = true;
+    }
+#endif
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplOpenGL3_InitPlatformInterface();
+
+    return true;
+}
+
+void    ImGui_ImplOpenGL3_Shutdown()
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplOpenGL3_ShutdownPlatformInterface();
+    ImGui_ImplOpenGL3_DestroyDeviceObjects();
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+void    ImGui_ImplOpenGL3_NewFrame()
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplOpenGL3_Init()?");
+
+    if (!bd->ShaderHandle)
+        ImGui_ImplOpenGL3_CreateDeviceObjects();
+}
+
+static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object)
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+
+    // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glDisable(GL_STENCIL_TEST);
+    glEnable(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    if (bd->GlVersion >= 310)
+        glDisable(GL_PRIMITIVE_RESTART);
+#endif
+#ifdef IMGUI_IMPL_HAS_POLYGON_MODE
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+#endif
+
+    // Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT)
+#if defined(GL_CLIP_ORIGIN)
+    bool clip_origin_lower_left = true;
+    if (bd->HasClipOrigin)
+    {
+        GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)&current_clip_origin);
+        if (current_clip_origin == GL_UPPER_LEFT)
+            clip_origin_lower_left = false;
+    }
+#endif
+
+    // Setup viewport, orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
+    float L = draw_data->DisplayPos.x;
+    float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+    float T = draw_data->DisplayPos.y;
+    float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+#if defined(GL_CLIP_ORIGIN)
+    if (!clip_origin_lower_left) { float tmp = T; T = B; B = tmp; } // Swap top and bottom if origin is upper left
+#endif
+    const float ortho_projection[4][4] =
+    {
+        { 2.0f/(R-L),   0.0f,         0.0f,   0.0f },
+        { 0.0f,         2.0f/(T-B),   0.0f,   0.0f },
+        { 0.0f,         0.0f,        -1.0f,   0.0f },
+        { (R+L)/(L-R),  (T+B)/(B-T),  0.0f,   1.0f },
+    };
+    glUseProgram(bd->ShaderHandle);
+    glUniform1i(bd->AttribLocationTex, 0);
+    glUniformMatrix4fv(bd->AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
+
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (bd->GlVersion >= 330)
+        glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise.
+#endif
+
+    (void)vertex_array_object;
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glBindVertexArray(vertex_array_object);
+#endif
+
+    // Bind vertex/index buffers and setup attributes for ImDrawVert
+    glBindBuffer(GL_ARRAY_BUFFER, bd->VboHandle);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bd->ElementsHandle);
+    glEnableVertexAttribArray(bd->AttribLocationVtxPos);
+    glEnableVertexAttribArray(bd->AttribLocationVtxUV);
+    glEnableVertexAttribArray(bd->AttribLocationVtxColor);
+    glVertexAttribPointer(bd->AttribLocationVtxPos,   2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos));
+    glVertexAttribPointer(bd->AttribLocationVtxUV,    2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv));
+    glVertexAttribPointer(bd->AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE,  sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col));
+}
+
+// OpenGL3 Render function.
+// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
+// This is in order to be able to run within an OpenGL engine that doesn't do so.
+void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
+    int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
+    if (fb_width <= 0 || fb_height <= 0)
+        return;
+
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+
+    // Backup GL state
+    GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture);
+    glActiveTexture(GL_TEXTURE0);
+    GLuint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&last_program);
+    GLuint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&last_texture);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    GLuint last_sampler; if (bd->GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
+#endif
+    GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer);
+#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    // This is part of VAO on OpenGL 3.0+ and OpenGL ES 3.0+.
+    GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer);
+    ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_pos; last_vtx_attrib_state_pos.GetState(bd->AttribLocationVtxPos);
+    ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_uv; last_vtx_attrib_state_uv.GetState(bd->AttribLocationVtxUV);
+    ImGui_ImplOpenGL3_VtxAttribState last_vtx_attrib_state_color; last_vtx_attrib_state_color.GetState(bd->AttribLocationVtxColor);
+#endif
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object);
+#endif
+#ifdef IMGUI_IMPL_HAS_POLYGON_MODE
+    GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
+#endif
+    GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
+    GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
+    GLenum last_blend_src_rgb; glGetIntegerv(GL_BLEND_SRC_RGB, (GLint*)&last_blend_src_rgb);
+    GLenum last_blend_dst_rgb; glGetIntegerv(GL_BLEND_DST_RGB, (GLint*)&last_blend_dst_rgb);
+    GLenum last_blend_src_alpha; glGetIntegerv(GL_BLEND_SRC_ALPHA, (GLint*)&last_blend_src_alpha);
+    GLenum last_blend_dst_alpha; glGetIntegerv(GL_BLEND_DST_ALPHA, (GLint*)&last_blend_dst_alpha);
+    GLenum last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, (GLint*)&last_blend_equation_rgb);
+    GLenum last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, (GLint*)&last_blend_equation_alpha);
+    GLboolean last_enable_blend = glIsEnabled(GL_BLEND);
+    GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE);
+    GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST);
+    GLboolean last_enable_stencil_test = glIsEnabled(GL_STENCIL_TEST);
+    GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    GLboolean last_enable_primitive_restart = (bd->GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE;
+#endif
+
+    // Setup desired GL state
+    // Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
+    // The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
+    GLuint vertex_array_object = 0;
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glGenVertexArrays(1, &vertex_array_object);
+#endif
+    ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
+
+    // Will project scissor/clipping rectangles into framebuffer space
+    ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
+    ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
+
+    // Render command lists
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+
+        // Upload vertex/index buffers
+        GLsizeiptr vtx_buffer_size = (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert);
+        GLsizeiptr idx_buffer_size = (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx);
+        if (bd->VertexBufferSize < vtx_buffer_size)
+        {
+            bd->VertexBufferSize = vtx_buffer_size;
+            glBufferData(GL_ARRAY_BUFFER, bd->VertexBufferSize, NULL, GL_STREAM_DRAW);
+        }
+        if (bd->IndexBufferSize < idx_buffer_size)
+        {
+            bd->IndexBufferSize = idx_buffer_size;
+            glBufferData(GL_ELEMENT_ARRAY_BUFFER, bd->IndexBufferSize, NULL, GL_STREAM_DRAW);
+        }
+        glBufferSubData(GL_ARRAY_BUFFER, 0, vtx_buffer_size, (const GLvoid*)cmd_list->VtxBuffer.Data);
+        glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, idx_buffer_size, (const GLvoid*)cmd_list->IdxBuffer.Data);
+
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback != NULL)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
+                ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle (Y is inverted in OpenGL)
+                glScissor((int)clip_min.x, (int)((float)fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y));
+
+                // Bind texture, Draw
+                glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID());
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+                if (bd->GlVersion >= 320)
+                    glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset);
+                else
+#endif
+                glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)));
+            }
+        }
+    }
+
+    // Destroy the temporary VAO
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glDeleteVertexArrays(1, &vertex_array_object);
+#endif
+
+    // Restore modified GL state
+    glUseProgram(last_program);
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (bd->GlVersion >= 330)
+        glBindSampler(0, last_sampler);
+#endif
+    glActiveTexture(last_active_texture);
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glBindVertexArray(last_vertex_array_object);
+#endif
+    glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
+#ifndef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
+    last_vtx_attrib_state_pos.SetState(bd->AttribLocationVtxPos);
+    last_vtx_attrib_state_uv.SetState(bd->AttribLocationVtxUV);
+    last_vtx_attrib_state_color.SetState(bd->AttribLocationVtxColor);
+#endif
+    glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
+    glBlendFuncSeparate(last_blend_src_rgb, last_blend_dst_rgb, last_blend_src_alpha, last_blend_dst_alpha);
+    if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND);
+    if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
+    if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
+    if (last_enable_stencil_test) glEnable(GL_STENCIL_TEST); else glDisable(GL_STENCIL_TEST);
+    if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    if (bd->GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); }
+#endif
+
+#ifdef IMGUI_IMPL_HAS_POLYGON_MODE
+    glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
+#endif
+    glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
+    glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
+    (void)bd; // Not all compilation paths use this
+}
+
+bool ImGui_ImplOpenGL3_CreateFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+
+    // Build texture atlas
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
+
+    // Upload texture to graphics system
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    GLint last_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    glGenTextures(1, &bd->FontTexture);
+    glBindTexture(GL_TEXTURE_2D, bd->FontTexture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+#ifdef GL_UNPACK_ROW_LENGTH // Not on WebGL/ES
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+#endif
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture);
+
+    // Restore state
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+
+    return true;
+}
+
+void ImGui_ImplOpenGL3_DestroyFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    if (bd->FontTexture)
+    {
+        glDeleteTextures(1, &bd->FontTexture);
+        io.Fonts->SetTexID(0);
+        bd->FontTexture = 0;
+    }
+}
+
+// If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file.
+static bool CheckShader(GLuint handle, const char* desc)
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    GLint status = 0, log_length = 0;
+    glGetShaderiv(handle, GL_COMPILE_STATUS, &status);
+    glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &log_length);
+    if ((GLboolean)status == GL_FALSE)
+        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s! With GLSL: %s\n", desc, bd->GlslVersionString);
+    if (log_length > 1)
+    {
+        ImVector<char> buf;
+        buf.resize((int)(log_length + 1));
+        glGetShaderInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        fprintf(stderr, "%s\n", buf.begin());
+    }
+    return (GLboolean)status == GL_TRUE;
+}
+
+// If you get an error please report on GitHub. You may try different GL context version or GLSL version.
+static bool CheckProgram(GLuint handle, const char* desc)
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    GLint status = 0, log_length = 0;
+    glGetProgramiv(handle, GL_LINK_STATUS, &status);
+    glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length);
+    if ((GLboolean)status == GL_FALSE)
+        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! With GLSL %s\n", desc, bd->GlslVersionString);
+    if (log_length > 1)
+    {
+        ImVector<char> buf;
+        buf.resize((int)(log_length + 1));
+        glGetProgramInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        fprintf(stderr, "%s\n", buf.begin());
+    }
+    return (GLboolean)status == GL_TRUE;
+}
+
+bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+
+    // Backup GL state
+    GLint last_texture, last_array_buffer;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    GLint last_vertex_array;
+    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
+#endif
+
+    // Parse GLSL version string
+    int glsl_version = 130;
+    sscanf(bd->GlslVersionString, "#version %d", &glsl_version);
+
+    const GLchar* vertex_shader_glsl_120 =
+        "uniform mat4 ProjMtx;\n"
+        "attribute vec2 Position;\n"
+        "attribute vec2 UV;\n"
+        "attribute vec4 Color;\n"
+        "varying vec2 Frag_UV;\n"
+        "varying vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_130 =
+        "uniform mat4 ProjMtx;\n"
+        "in vec2 Position;\n"
+        "in vec2 UV;\n"
+        "in vec4 Color;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_300_es =
+        "precision highp float;\n"
+        "layout (location = 0) in vec2 Position;\n"
+        "layout (location = 1) in vec2 UV;\n"
+        "layout (location = 2) in vec4 Color;\n"
+        "uniform mat4 ProjMtx;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_410_core =
+        "layout (location = 0) in vec2 Position;\n"
+        "layout (location = 1) in vec2 UV;\n"
+        "layout (location = 2) in vec4 Color;\n"
+        "uniform mat4 ProjMtx;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_120 =
+        "#ifdef GL_ES\n"
+        "    precision mediump float;\n"
+        "#endif\n"
+        "uniform sampler2D Texture;\n"
+        "varying vec2 Frag_UV;\n"
+        "varying vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_130 =
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_300_es =
+        "precision mediump float;\n"
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "layout (location = 0) out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_410_core =
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "uniform sampler2D Texture;\n"
+        "layout (location = 0) out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    // Select shaders matching our GLSL versions
+    const GLchar* vertex_shader = NULL;
+    const GLchar* fragment_shader = NULL;
+    if (glsl_version < 130)
+    {
+        vertex_shader = vertex_shader_glsl_120;
+        fragment_shader = fragment_shader_glsl_120;
+    }
+    else if (glsl_version >= 410)
+    {
+        vertex_shader = vertex_shader_glsl_410_core;
+        fragment_shader = fragment_shader_glsl_410_core;
+    }
+    else if (glsl_version == 300)
+    {
+        vertex_shader = vertex_shader_glsl_300_es;
+        fragment_shader = fragment_shader_glsl_300_es;
+    }
+    else
+    {
+        vertex_shader = vertex_shader_glsl_130;
+        fragment_shader = fragment_shader_glsl_130;
+    }
+
+    // Create shaders
+    const GLchar* vertex_shader_with_version[2] = { bd->GlslVersionString, vertex_shader };
+    GLuint vert_handle = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vert_handle, 2, vertex_shader_with_version, NULL);
+    glCompileShader(vert_handle);
+    CheckShader(vert_handle, "vertex shader");
+
+    const GLchar* fragment_shader_with_version[2] = { bd->GlslVersionString, fragment_shader };
+    GLuint frag_handle = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(frag_handle, 2, fragment_shader_with_version, NULL);
+    glCompileShader(frag_handle);
+    CheckShader(frag_handle, "fragment shader");
+
+    // Link
+    bd->ShaderHandle = glCreateProgram();
+    glAttachShader(bd->ShaderHandle, vert_handle);
+    glAttachShader(bd->ShaderHandle, frag_handle);
+    glLinkProgram(bd->ShaderHandle);
+    CheckProgram(bd->ShaderHandle, "shader program");
+
+    glDetachShader(bd->ShaderHandle, vert_handle);
+    glDetachShader(bd->ShaderHandle, frag_handle);
+    glDeleteShader(vert_handle);
+    glDeleteShader(frag_handle);
+
+    bd->AttribLocationTex = glGetUniformLocation(bd->ShaderHandle, "Texture");
+    bd->AttribLocationProjMtx = glGetUniformLocation(bd->ShaderHandle, "ProjMtx");
+    bd->AttribLocationVtxPos = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Position");
+    bd->AttribLocationVtxUV = (GLuint)glGetAttribLocation(bd->ShaderHandle, "UV");
+    bd->AttribLocationVtxColor = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Color");
+
+    // Create buffers
+    glGenBuffers(1, &bd->VboHandle);
+    glGenBuffers(1, &bd->ElementsHandle);
+
+    ImGui_ImplOpenGL3_CreateFontsTexture();
+
+    // Restore modified GL state
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+    glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
+#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY
+    glBindVertexArray(last_vertex_array);
+#endif
+
+    return true;
+}
+
+void    ImGui_ImplOpenGL3_DestroyDeviceObjects()
+{
+    ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData();
+    if (bd->VboHandle)      { glDeleteBuffers(1, &bd->VboHandle); bd->VboHandle = 0; }
+    if (bd->ElementsHandle) { glDeleteBuffers(1, &bd->ElementsHandle); bd->ElementsHandle = 0; }
+    if (bd->ShaderHandle)   { glDeleteProgram(bd->ShaderHandle); bd->ShaderHandle = 0; }
+    ImGui_ImplOpenGL3_DestroyFontsTexture();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+static void ImGui_ImplOpenGL3_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+    {
+        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+    ImGui_ImplOpenGL3_RenderDrawData(viewport->DrawData);
+}
+
+static void ImGui_ImplOpenGL3_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL3_RenderWindow;
+}
+
+static void ImGui_ImplOpenGL3_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}
+
+#if defined(__clang__)
+#pragma clang diagnostic pop
+#endif

extern/imgui_patched/backends/imgui_impl_opengl3.h

@@ -0,0 +1,56 @@
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
+// - Desktop GL: 2.x 3.x 4.x
+// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [x] Renderer: Large meshes support (64k+ vertices) with 16-bit indices (Desktop OpenGL only).
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// About GLSL version:
+//  The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
+//  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"
+//  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+// Backend API
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
+
+// (Optional) Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateFontsTexture();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyFontsTexture();
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
+
+// Specific OpenGL ES versions
+//#define IMGUI_IMPL_OPENGL_ES2     // Auto-detected on Emscripten
+//#define IMGUI_IMPL_OPENGL_ES3     // Auto-detected on iOS/Android
+
+// You can explicitly select GLES2 or GLES3 API by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) \
+ && !defined(IMGUI_IMPL_OPENGL_ES3)
+
+// Try to detect GLES on matching platforms
+#if defined(__APPLE__)
+#include <TargetConditionals.h>
+#endif
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
+#define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"
+#elif defined(__EMSCRIPTEN__) || defined(__amigaos4__)
+#define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"
+#else
+// Otherwise imgui_impl_opengl3_loader.h will be used.
+#endif
+
+#endif

extern/imgui_patched/backends/imgui_impl_opengl3_loader.h

@@ -0,0 +1,784 @@
+//-----------------------------------------------------------------------------
+// About imgui_impl_opengl3_loader.h:
+//
+// We embed our own OpenGL loader to not require user to provide their own or to have to use ours,
+// which proved to be endless problems for users.
+// Our loader is custom-generated, based on gl3w but automatically filtered to only include
+// enums/functions that we use in our imgui_impl_opengl3.cpp source file in order to be small.
+//
+// YOU SHOULD NOT NEED TO INCLUDE/USE THIS DIRECTLY. THIS IS USED BY imgui_impl_opengl3.cpp ONLY.
+// THE REST OF YOUR APP SHOULD USE A DIFFERENT GL LOADER: ANY GL LOADER OF YOUR CHOICE.
+//
+// Regenerate with:
+//   python gl3w_gen.py --output ../imgui/backends/imgui_impl_opengl3_loader.h --ref ../imgui/backends/imgui_impl_opengl3.cpp ./extra_symbols.txt
+//
+// More info:
+//   https://github.com/dearimgui/gl3w_stripped
+//   https://github.com/ocornut/imgui/issues/4445
+//-----------------------------------------------------------------------------
+
+/*
+ * This file was generated with gl3w_gen.py, part of imgl3w
+ * (hosted at https://github.com/dearimgui/gl3w_stripped)
+ *
+ * This is free and unencumbered software released into the public domain.
+ *
+ * Anyone is free to copy, modify, publish, use, compile, sell, or
+ * distribute this software, either in source code form or as a compiled
+ * binary, for any purpose, commercial or non-commercial, and by any
+ * means.
+ *
+ * In jurisdictions that recognize copyright laws, the author or authors
+ * of this software dedicate any and all copyright interest in the
+ * software to the public domain. We make this dedication for the benefit
+ * of the public at large and to the detriment of our heirs and
+ * successors. We intend this dedication to be an overt act of
+ * relinquishment in perpetuity of all present and future rights to this
+ * software under copyright law.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __gl3w_h_
+#define __gl3w_h_
+
+// Adapted from KHR/khrplatform.h to avoid including entire file.
+#ifndef __khrplatform_h_
+typedef          float         khronos_float_t;
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+#ifdef _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef signed   long long int khronos_ssize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef signed   long  int     khronos_ssize_t;
+#endif
+
+#if defined(_MSC_VER) && !defined(__clang__)
+typedef signed   __int64       khronos_int64_t;
+typedef unsigned __int64       khronos_uint64_t;
+#elif (defined(__clang__) || defined(__GNUC__)) && (__cplusplus < 201100)
+#include <stdint.h>
+typedef          int64_t       khronos_int64_t;
+typedef          uint64_t      khronos_uint64_t;
+#else
+typedef signed   long long     khronos_int64_t;
+typedef unsigned long long     khronos_uint64_t;
+#endif
+#endif  // __khrplatform_h_
+
+#ifndef __gl_glcorearb_h_
+#define __gl_glcorearb_h_ 1
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+** Copyright 2013-2020 The Khronos Group Inc.
+** SPDX-License-Identifier: MIT
+**
+** This header is generated from the Khronos OpenGL / OpenGL ES XML
+** API Registry. The current version of the Registry, generator scripts
+** used to make the header, and the header can be found at
+**   https://github.com/KhronosGroup/OpenGL-Registry
+*/
+#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN 1
+#endif
+#include <windows.h>
+#endif
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
+#ifndef GLAPI
+#define GLAPI extern
+#endif
+/* glcorearb.h is for use with OpenGL core profile implementations.
+** It should should be placed in the same directory as gl.h and
+** included as <GL/glcorearb.h>.
+**
+** glcorearb.h includes only APIs in the latest OpenGL core profile
+** implementation together with APIs in newer ARB extensions which 
+** can be supported by the core profile. It does not, and never will
+** include functionality removed from the core profile, such as
+** fixed-function vertex and fragment processing.
+**
+** Do not #include both <GL/glcorearb.h> and either of <GL/gl.h> or
+** <GL/glext.h> in the same source file.
+*/
+/* Generated C header for:
+ * API: gl
+ * Profile: core
+ * Versions considered: .*
+ * Versions emitted: .*
+ * Default extensions included: glcore
+ * Additional extensions included: _nomatch_^
+ * Extensions removed: _nomatch_^
+ */
+#ifndef GL_VERSION_1_0
+typedef void GLvoid;
+typedef unsigned int GLenum;
+
+typedef khronos_float_t GLfloat;
+typedef int GLint;
+typedef int GLsizei;
+typedef unsigned int GLbitfield;
+typedef double GLdouble;
+typedef unsigned int GLuint;
+typedef unsigned char GLboolean;
+typedef khronos_uint8_t GLubyte;
+#define GL_COLOR_BUFFER_BIT               0x00004000
+#define GL_FALSE                          0
+#define GL_TRUE                           1
+#define GL_TRIANGLES                      0x0004
+#define GL_ONE                            1
+#define GL_SRC_ALPHA                      0x0302
+#define GL_ONE_MINUS_SRC_ALPHA            0x0303
+#define GL_FRONT_AND_BACK                 0x0408
+#define GL_POLYGON_MODE                   0x0B40
+#define GL_CULL_FACE                      0x0B44
+#define GL_DEPTH_TEST                     0x0B71
+#define GL_STENCIL_TEST                   0x0B90
+#define GL_VIEWPORT                       0x0BA2
+#define GL_BLEND                          0x0BE2
+#define GL_SCISSOR_BOX                    0x0C10
+#define GL_SCISSOR_TEST                   0x0C11
+#define GL_UNPACK_ROW_LENGTH              0x0CF2
+#define GL_PACK_ALIGNMENT                 0x0D05
+#define GL_TEXTURE_2D                     0x0DE1
+#define GL_UNSIGNED_BYTE                  0x1401
+#define GL_UNSIGNED_SHORT                 0x1403
+#define GL_UNSIGNED_INT                   0x1405
+#define GL_FLOAT                          0x1406
+#define GL_RGBA                           0x1908
+#define GL_FILL                           0x1B02
+#define GL_VERSION                        0x1F02
+#define GL_EXTENSIONS                     0x1F03
+#define GL_LINEAR                         0x2601
+#define GL_TEXTURE_MAG_FILTER             0x2800
+#define GL_TEXTURE_MIN_FILTER             0x2801
+typedef void (APIENTRYP PFNGLPOLYGONMODEPROC) (GLenum face, GLenum mode);
+typedef void (APIENTRYP PFNGLSCISSORPROC) (GLint x, GLint y, GLsizei width, GLsizei height);
+typedef void (APIENTRYP PFNGLTEXPARAMETERIPROC) (GLenum target, GLenum pname, GLint param);
+typedef void (APIENTRYP PFNGLTEXIMAGE2DPROC) (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);
+typedef void (APIENTRYP PFNGLCLEARPROC) (GLbitfield mask);
+typedef void (APIENTRYP PFNGLCLEARCOLORPROC) (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+typedef void (APIENTRYP PFNGLDISABLEPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLENABLEPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLFLUSHPROC) (void);
+typedef void (APIENTRYP PFNGLPIXELSTOREIPROC) (GLenum pname, GLint param);
+typedef void (APIENTRYP PFNGLREADPIXELSPROC) (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels);
+typedef GLenum (APIENTRYP PFNGLGETERRORPROC) (void);
+typedef void (APIENTRYP PFNGLGETINTEGERVPROC) (GLenum pname, GLint *data);
+typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGPROC) (GLenum name);
+typedef GLboolean (APIENTRYP PFNGLISENABLEDPROC) (GLenum cap);
+typedef void (APIENTRYP PFNGLVIEWPORTPROC) (GLint x, GLint y, GLsizei width, GLsizei height);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glPolygonMode (GLenum face, GLenum mode);
+GLAPI void APIENTRY glScissor (GLint x, GLint y, GLsizei width, GLsizei height);
+GLAPI void APIENTRY glTexParameteri (GLenum target, GLenum pname, GLint param);
+GLAPI void APIENTRY glTexImage2D (GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void *pixels);
+GLAPI void APIENTRY glClear (GLbitfield mask);
+GLAPI void APIENTRY glClearColor (GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
+GLAPI void APIENTRY glDisable (GLenum cap);
+GLAPI void APIENTRY glEnable (GLenum cap);
+GLAPI void APIENTRY glFlush (void);
+GLAPI void APIENTRY glPixelStorei (GLenum pname, GLint param);
+GLAPI void APIENTRY glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void *pixels);
+GLAPI GLenum APIENTRY glGetError (void);
+GLAPI void APIENTRY glGetIntegerv (GLenum pname, GLint *data);
+GLAPI const GLubyte *APIENTRY glGetString (GLenum name);
+GLAPI GLboolean APIENTRY glIsEnabled (GLenum cap);
+GLAPI void APIENTRY glViewport (GLint x, GLint y, GLsizei width, GLsizei height);
+#endif
+#endif /* GL_VERSION_1_0 */
+#ifndef GL_VERSION_1_1
+typedef khronos_float_t GLclampf;
+typedef double GLclampd;
+#define GL_TEXTURE_BINDING_2D             0x8069
+typedef void (APIENTRYP PFNGLDRAWELEMENTSPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices);
+typedef void (APIENTRYP PFNGLBINDTEXTUREPROC) (GLenum target, GLuint texture);
+typedef void (APIENTRYP PFNGLDELETETEXTURESPROC) (GLsizei n, const GLuint *textures);
+typedef void (APIENTRYP PFNGLGENTEXTURESPROC) (GLsizei n, GLuint *textures);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glDrawElements (GLenum mode, GLsizei count, GLenum type, const void *indices);
+GLAPI void APIENTRY glBindTexture (GLenum target, GLuint texture);
+GLAPI void APIENTRY glDeleteTextures (GLsizei n, const GLuint *textures);
+GLAPI void APIENTRY glGenTextures (GLsizei n, GLuint *textures);
+#endif
+#endif /* GL_VERSION_1_1 */
+#ifndef GL_VERSION_1_3
+#define GL_TEXTURE0                       0x84C0
+#define GL_ACTIVE_TEXTURE                 0x84E0
+typedef void (APIENTRYP PFNGLACTIVETEXTUREPROC) (GLenum texture);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glActiveTexture (GLenum texture);
+#endif
+#endif /* GL_VERSION_1_3 */
+#ifndef GL_VERSION_1_4
+#define GL_BLEND_DST_RGB                  0x80C8
+#define GL_BLEND_SRC_RGB                  0x80C9
+#define GL_BLEND_DST_ALPHA                0x80CA
+#define GL_BLEND_SRC_ALPHA                0x80CB
+#define GL_FUNC_ADD                       0x8006
+typedef void (APIENTRYP PFNGLBLENDFUNCSEPARATEPROC) (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
+typedef void (APIENTRYP PFNGLBLENDEQUATIONPROC) (GLenum mode);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBlendFuncSeparate (GLenum sfactorRGB, GLenum dfactorRGB, GLenum sfactorAlpha, GLenum dfactorAlpha);
+GLAPI void APIENTRY glBlendEquation (GLenum mode);
+#endif
+#endif /* GL_VERSION_1_4 */
+#ifndef GL_VERSION_1_5
+typedef khronos_ssize_t GLsizeiptr;
+typedef khronos_intptr_t GLintptr;
+#define GL_ARRAY_BUFFER                   0x8892
+#define GL_ELEMENT_ARRAY_BUFFER           0x8893
+#define GL_ARRAY_BUFFER_BINDING           0x8894
+#define GL_ELEMENT_ARRAY_BUFFER_BINDING   0x8895
+#define GL_STREAM_DRAW                    0x88E0
+typedef void (APIENTRYP PFNGLBINDBUFFERPROC) (GLenum target, GLuint buffer);
+typedef void (APIENTRYP PFNGLDELETEBUFFERSPROC) (GLsizei n, const GLuint *buffers);
+typedef void (APIENTRYP PFNGLGENBUFFERSPROC) (GLsizei n, GLuint *buffers);
+typedef void (APIENTRYP PFNGLBUFFERDATAPROC) (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+typedef void (APIENTRYP PFNGLBUFFERSUBDATAPROC) (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBindBuffer (GLenum target, GLuint buffer);
+GLAPI void APIENTRY glDeleteBuffers (GLsizei n, const GLuint *buffers);
+GLAPI void APIENTRY glGenBuffers (GLsizei n, GLuint *buffers);
+GLAPI void APIENTRY glBufferData (GLenum target, GLsizeiptr size, const void *data, GLenum usage);
+GLAPI void APIENTRY glBufferSubData (GLenum target, GLintptr offset, GLsizeiptr size, const void *data);
+#endif
+#endif /* GL_VERSION_1_5 */
+#ifndef GL_VERSION_2_0
+typedef char GLchar;
+typedef khronos_int16_t GLshort;
+typedef khronos_int8_t GLbyte;
+typedef khronos_uint16_t GLushort;
+#define GL_BLEND_EQUATION_RGB             0x8009
+#define GL_VERTEX_ATTRIB_ARRAY_ENABLED    0x8622
+#define GL_VERTEX_ATTRIB_ARRAY_SIZE       0x8623
+#define GL_VERTEX_ATTRIB_ARRAY_STRIDE     0x8624
+#define GL_VERTEX_ATTRIB_ARRAY_TYPE       0x8625
+#define GL_VERTEX_ATTRIB_ARRAY_POINTER    0x8645
+#define GL_BLEND_EQUATION_ALPHA           0x883D
+#define GL_VERTEX_ATTRIB_ARRAY_NORMALIZED 0x886A
+#define GL_FRAGMENT_SHADER                0x8B30
+#define GL_VERTEX_SHADER                  0x8B31
+#define GL_COMPILE_STATUS                 0x8B81
+#define GL_LINK_STATUS                    0x8B82
+#define GL_INFO_LOG_LENGTH                0x8B84
+#define GL_CURRENT_PROGRAM                0x8B8D
+#define GL_UPPER_LEFT                     0x8CA2
+typedef void (APIENTRYP PFNGLBLENDEQUATIONSEPARATEPROC) (GLenum modeRGB, GLenum modeAlpha);
+typedef void (APIENTRYP PFNGLATTACHSHADERPROC) (GLuint program, GLuint shader);
+typedef void (APIENTRYP PFNGLCOMPILESHADERPROC) (GLuint shader);
+typedef GLuint (APIENTRYP PFNGLCREATEPROGRAMPROC) (void);
+typedef GLuint (APIENTRYP PFNGLCREATESHADERPROC) (GLenum type);
+typedef void (APIENTRYP PFNGLDELETEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLDELETESHADERPROC) (GLuint shader);
+typedef void (APIENTRYP PFNGLDETACHSHADERPROC) (GLuint program, GLuint shader);
+typedef void (APIENTRYP PFNGLDISABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef void (APIENTRYP PFNGLENABLEVERTEXATTRIBARRAYPROC) (GLuint index);
+typedef GLint (APIENTRYP PFNGLGETATTRIBLOCATIONPROC) (GLuint program, const GLchar *name);
+typedef void (APIENTRYP PFNGLGETPROGRAMIVPROC) (GLuint program, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETPROGRAMINFOLOGPROC) (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef void (APIENTRYP PFNGLGETSHADERIVPROC) (GLuint shader, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETSHADERINFOLOGPROC) (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+typedef GLint (APIENTRYP PFNGLGETUNIFORMLOCATIONPROC) (GLuint program, const GLchar *name);
+typedef void (APIENTRYP PFNGLGETVERTEXATTRIBIVPROC) (GLuint index, GLenum pname, GLint *params);
+typedef void (APIENTRYP PFNGLGETVERTEXATTRIBPOINTERVPROC) (GLuint index, GLenum pname, void **pointer);
+typedef void (APIENTRYP PFNGLLINKPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLSHADERSOURCEPROC) (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);
+typedef void (APIENTRYP PFNGLUSEPROGRAMPROC) (GLuint program);
+typedef void (APIENTRYP PFNGLUNIFORM1IPROC) (GLint location, GLint v0);
+typedef void (APIENTRYP PFNGLUNIFORMMATRIX4FVPROC) (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+typedef void (APIENTRYP PFNGLVERTEXATTRIBPOINTERPROC) (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBlendEquationSeparate (GLenum modeRGB, GLenum modeAlpha);
+GLAPI void APIENTRY glAttachShader (GLuint program, GLuint shader);
+GLAPI void APIENTRY glCompileShader (GLuint shader);
+GLAPI GLuint APIENTRY glCreateProgram (void);
+GLAPI GLuint APIENTRY glCreateShader (GLenum type);
+GLAPI void APIENTRY glDeleteProgram (GLuint program);
+GLAPI void APIENTRY glDeleteShader (GLuint shader);
+GLAPI void APIENTRY glDetachShader (GLuint program, GLuint shader);
+GLAPI void APIENTRY glDisableVertexAttribArray (GLuint index);
+GLAPI void APIENTRY glEnableVertexAttribArray (GLuint index);
+GLAPI GLint APIENTRY glGetAttribLocation (GLuint program, const GLchar *name);
+GLAPI void APIENTRY glGetProgramiv (GLuint program, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetProgramInfoLog (GLuint program, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+GLAPI void APIENTRY glGetShaderiv (GLuint shader, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetShaderInfoLog (GLuint shader, GLsizei bufSize, GLsizei *length, GLchar *infoLog);
+GLAPI GLint APIENTRY glGetUniformLocation (GLuint program, const GLchar *name);
+GLAPI void APIENTRY glGetVertexAttribiv (GLuint index, GLenum pname, GLint *params);
+GLAPI void APIENTRY glGetVertexAttribPointerv (GLuint index, GLenum pname, void **pointer);
+GLAPI void APIENTRY glLinkProgram (GLuint program);
+GLAPI void APIENTRY glShaderSource (GLuint shader, GLsizei count, const GLchar *const*string, const GLint *length);
+GLAPI void APIENTRY glUseProgram (GLuint program);
+GLAPI void APIENTRY glUniform1i (GLint location, GLint v0);
+GLAPI void APIENTRY glUniformMatrix4fv (GLint location, GLsizei count, GLboolean transpose, const GLfloat *value);
+GLAPI void APIENTRY glVertexAttribPointer (GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer);
+#endif
+#endif /* GL_VERSION_2_0 */
+#ifndef GL_VERSION_3_0
+typedef khronos_uint16_t GLhalf;
+#define GL_MAJOR_VERSION                  0x821B
+#define GL_MINOR_VERSION                  0x821C
+#define GL_NUM_EXTENSIONS                 0x821D
+#define GL_FRAMEBUFFER_SRGB               0x8DB9
+#define GL_VERTEX_ARRAY_BINDING           0x85B5
+typedef void (APIENTRYP PFNGLGETBOOLEANI_VPROC) (GLenum target, GLuint index, GLboolean *data);
+typedef void (APIENTRYP PFNGLGETINTEGERI_VPROC) (GLenum target, GLuint index, GLint *data);
+typedef const GLubyte *(APIENTRYP PFNGLGETSTRINGIPROC) (GLenum name, GLuint index);
+typedef void (APIENTRYP PFNGLBINDVERTEXARRAYPROC) (GLuint array);
+typedef void (APIENTRYP PFNGLDELETEVERTEXARRAYSPROC) (GLsizei n, const GLuint *arrays);
+typedef void (APIENTRYP PFNGLGENVERTEXARRAYSPROC) (GLsizei n, GLuint *arrays);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI const GLubyte *APIENTRY glGetStringi (GLenum name, GLuint index);
+GLAPI void APIENTRY glBindVertexArray (GLuint array);
+GLAPI void APIENTRY glDeleteVertexArrays (GLsizei n, const GLuint *arrays);
+GLAPI void APIENTRY glGenVertexArrays (GLsizei n, GLuint *arrays);
+#endif
+#endif /* GL_VERSION_3_0 */
+#ifndef GL_VERSION_3_1
+#define GL_VERSION_3_1 1
+#define GL_PRIMITIVE_RESTART              0x8F9D
+#endif /* GL_VERSION_3_1 */
+#ifndef GL_VERSION_3_2
+#define GL_VERSION_3_2 1
+typedef struct __GLsync *GLsync;
+typedef khronos_uint64_t GLuint64;
+typedef khronos_int64_t GLint64;
+typedef void (APIENTRYP PFNGLDRAWELEMENTSBASEVERTEXPROC) (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex);
+typedef void (APIENTRYP PFNGLGETINTEGER64I_VPROC) (GLenum target, GLuint index, GLint64 *data);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glDrawElementsBaseVertex (GLenum mode, GLsizei count, GLenum type, const void *indices, GLint basevertex);
+#endif
+#endif /* GL_VERSION_3_2 */
+#ifndef GL_VERSION_3_3
+#define GL_VERSION_3_3 1
+#define GL_SAMPLER_BINDING                0x8919
+typedef void (APIENTRYP PFNGLBINDSAMPLERPROC) (GLuint unit, GLuint sampler);
+#ifdef GL_GLEXT_PROTOTYPES
+GLAPI void APIENTRY glBindSampler (GLuint unit, GLuint sampler);
+#endif
+#endif /* GL_VERSION_3_3 */
+#ifndef GL_VERSION_4_1
+typedef void (APIENTRYP PFNGLGETFLOATI_VPROC) (GLenum target, GLuint index, GLfloat *data);
+typedef void (APIENTRYP PFNGLGETDOUBLEI_VPROC) (GLenum target, GLuint index, GLdouble *data);
+#endif /* GL_VERSION_4_1 */
+#ifndef GL_VERSION_4_3
+typedef void (APIENTRY  *GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
+#endif /* GL_VERSION_4_3 */
+#ifndef GL_VERSION_4_5
+#define GL_CLIP_ORIGIN                    0x935C
+typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint *param);
+typedef void (APIENTRYP PFNGLGETTRANSFORMFEEDBACKI64_VPROC) (GLuint xfb, GLenum pname, GLuint index, GLint64 *param);
+#endif /* GL_VERSION_4_5 */
+#ifndef GL_ARB_bindless_texture
+typedef khronos_uint64_t GLuint64EXT;
+#endif /* GL_ARB_bindless_texture */
+#ifndef GL_ARB_cl_event
+struct _cl_context;
+struct _cl_event;
+#endif /* GL_ARB_cl_event */
+#ifndef GL_ARB_clip_control
+#define GL_ARB_clip_control 1
+#endif /* GL_ARB_clip_control */
+#ifndef GL_ARB_debug_output
+typedef void (APIENTRY  *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,const void *userParam);
+#endif /* GL_ARB_debug_output */
+#ifndef GL_EXT_EGL_image_storage
+typedef void *GLeglImageOES;
+#endif /* GL_EXT_EGL_image_storage */
+#ifndef GL_EXT_direct_state_access
+typedef void (APIENTRYP PFNGLGETFLOATI_VEXTPROC) (GLenum pname, GLuint index, GLfloat *params);
+typedef void (APIENTRYP PFNGLGETDOUBLEI_VEXTPROC) (GLenum pname, GLuint index, GLdouble *params);
+typedef void (APIENTRYP PFNGLGETPOINTERI_VEXTPROC) (GLenum pname, GLuint index, void **params);
+typedef void (APIENTRYP PFNGLGETVERTEXARRAYINTEGERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, GLint *param);
+typedef void (APIENTRYP PFNGLGETVERTEXARRAYPOINTERI_VEXTPROC) (GLuint vaobj, GLuint index, GLenum pname, void **param);
+#endif /* GL_EXT_direct_state_access */
+#ifndef GL_NV_draw_vulkan_image
+typedef void (APIENTRY  *GLVULKANPROCNV)(void);
+#endif /* GL_NV_draw_vulkan_image */
+#ifndef GL_NV_gpu_shader5
+typedef khronos_int64_t GLint64EXT;
+#endif /* GL_NV_gpu_shader5 */
+#ifndef GL_NV_vertex_buffer_unified_memory
+typedef void (APIENTRYP PFNGLGETINTEGERUI64I_VNVPROC) (GLenum value, GLuint index, GLuint64EXT *result);
+#endif /* GL_NV_vertex_buffer_unified_memory */
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#ifndef GL3W_API
+#define GL3W_API
+#endif
+
+#ifndef __gl_h_
+#define __gl_h_
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GL3W_OK 0
+#define GL3W_ERROR_INIT -1
+#define GL3W_ERROR_LIBRARY_OPEN -2
+#define GL3W_ERROR_OPENGL_VERSION -3
+
+typedef void (*GL3WglProc)(void);
+typedef GL3WglProc (*GL3WGetProcAddressProc)(const char *proc);
+
+/* gl3w api */
+GL3W_API int imgl3wInit(void);
+GL3W_API int imgl3wInit2(GL3WGetProcAddressProc proc);
+GL3W_API int imgl3wIsSupported(int major, int minor);
+GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc);
+
+/* gl3w internal state */
+union GL3WProcs {
+    GL3WglProc ptr[58];
+    struct {
+        PFNGLACTIVETEXTUREPROC            ActiveTexture;
+        PFNGLATTACHSHADERPROC             AttachShader;
+        PFNGLBINDBUFFERPROC               BindBuffer;
+        PFNGLBINDSAMPLERPROC              BindSampler;
+        PFNGLBINDTEXTUREPROC              BindTexture;
+        PFNGLBINDVERTEXARRAYPROC          BindVertexArray;
+        PFNGLBLENDEQUATIONPROC            BlendEquation;
+        PFNGLBLENDEQUATIONSEPARATEPROC    BlendEquationSeparate;
+        PFNGLBLENDFUNCSEPARATEPROC        BlendFuncSeparate;
+        PFNGLBUFFERDATAPROC               BufferData;
+        PFNGLBUFFERSUBDATAPROC            BufferSubData;
+        PFNGLCLEARPROC                    Clear;
+        PFNGLCLEARCOLORPROC               ClearColor;
+        PFNGLCOMPILESHADERPROC            CompileShader;
+        PFNGLCREATEPROGRAMPROC            CreateProgram;
+        PFNGLCREATESHADERPROC             CreateShader;
+        PFNGLDELETEBUFFERSPROC            DeleteBuffers;
+        PFNGLDELETEPROGRAMPROC            DeleteProgram;
+        PFNGLDELETESHADERPROC             DeleteShader;
+        PFNGLDELETETEXTURESPROC           DeleteTextures;
+        PFNGLDELETEVERTEXARRAYSPROC       DeleteVertexArrays;
+        PFNGLDETACHSHADERPROC             DetachShader;
+        PFNGLDISABLEPROC                  Disable;
+        PFNGLDISABLEVERTEXATTRIBARRAYPROC DisableVertexAttribArray;
+        PFNGLDRAWELEMENTSPROC             DrawElements;
+        PFNGLDRAWELEMENTSBASEVERTEXPROC   DrawElementsBaseVertex;
+        PFNGLENABLEPROC                   Enable;
+        PFNGLENABLEVERTEXATTRIBARRAYPROC  EnableVertexAttribArray;
+        PFNGLFLUSHPROC                    Flush;
+        PFNGLGENBUFFERSPROC               GenBuffers;
+        PFNGLGENTEXTURESPROC              GenTextures;
+        PFNGLGENVERTEXARRAYSPROC          GenVertexArrays;
+        PFNGLGETATTRIBLOCATIONPROC        GetAttribLocation;
+        PFNGLGETERRORPROC                 GetError;
+        PFNGLGETINTEGERVPROC              GetIntegerv;
+        PFNGLGETPROGRAMINFOLOGPROC        GetProgramInfoLog;
+        PFNGLGETPROGRAMIVPROC             GetProgramiv;
+        PFNGLGETSHADERINFOLOGPROC         GetShaderInfoLog;
+        PFNGLGETSHADERIVPROC              GetShaderiv;
+        PFNGLGETSTRINGPROC                GetString;
+        PFNGLGETSTRINGIPROC               GetStringi;
+        PFNGLGETUNIFORMLOCATIONPROC       GetUniformLocation;
+        PFNGLGETVERTEXATTRIBPOINTERVPROC  GetVertexAttribPointerv;
+        PFNGLGETVERTEXATTRIBIVPROC        GetVertexAttribiv;
+        PFNGLISENABLEDPROC                IsEnabled;
+        PFNGLLINKPROGRAMPROC              LinkProgram;
+        PFNGLPIXELSTOREIPROC              PixelStorei;
+        PFNGLPOLYGONMODEPROC              PolygonMode;
+        PFNGLREADPIXELSPROC               ReadPixels;
+        PFNGLSCISSORPROC                  Scissor;
+        PFNGLSHADERSOURCEPROC             ShaderSource;
+        PFNGLTEXIMAGE2DPROC               TexImage2D;
+        PFNGLTEXPARAMETERIPROC            TexParameteri;
+        PFNGLUNIFORM1IPROC                Uniform1i;
+        PFNGLUNIFORMMATRIX4FVPROC         UniformMatrix4fv;
+        PFNGLUSEPROGRAMPROC               UseProgram;
+        PFNGLVERTEXATTRIBPOINTERPROC      VertexAttribPointer;
+        PFNGLVIEWPORTPROC                 Viewport;
+    } gl;
+};
+
+GL3W_API extern union GL3WProcs imgl3wProcs;
+
+/* OpenGL functions */
+#define glActiveTexture                   imgl3wProcs.gl.ActiveTexture
+#define glAttachShader                    imgl3wProcs.gl.AttachShader
+#define glBindBuffer                      imgl3wProcs.gl.BindBuffer
+#define glBindSampler                     imgl3wProcs.gl.BindSampler
+#define glBindTexture                     imgl3wProcs.gl.BindTexture
+#define glBindVertexArray                 imgl3wProcs.gl.BindVertexArray
+#define glBlendEquation                   imgl3wProcs.gl.BlendEquation
+#define glBlendEquationSeparate           imgl3wProcs.gl.BlendEquationSeparate
+#define glBlendFuncSeparate               imgl3wProcs.gl.BlendFuncSeparate
+#define glBufferData                      imgl3wProcs.gl.BufferData
+#define glBufferSubData                   imgl3wProcs.gl.BufferSubData
+#define glClear                           imgl3wProcs.gl.Clear
+#define glClearColor                      imgl3wProcs.gl.ClearColor
+#define glCompileShader                   imgl3wProcs.gl.CompileShader
+#define glCreateProgram                   imgl3wProcs.gl.CreateProgram
+#define glCreateShader                    imgl3wProcs.gl.CreateShader
+#define glDeleteBuffers                   imgl3wProcs.gl.DeleteBuffers
+#define glDeleteProgram                   imgl3wProcs.gl.DeleteProgram
+#define glDeleteShader                    imgl3wProcs.gl.DeleteShader
+#define glDeleteTextures                  imgl3wProcs.gl.DeleteTextures
+#define glDeleteVertexArrays              imgl3wProcs.gl.DeleteVertexArrays
+#define glDetachShader                    imgl3wProcs.gl.DetachShader
+#define glDisable                         imgl3wProcs.gl.Disable
+#define glDisableVertexAttribArray        imgl3wProcs.gl.DisableVertexAttribArray
+#define glDrawElements                    imgl3wProcs.gl.DrawElements
+#define glDrawElementsBaseVertex          imgl3wProcs.gl.DrawElementsBaseVertex
+#define glEnable                          imgl3wProcs.gl.Enable
+#define glEnableVertexAttribArray         imgl3wProcs.gl.EnableVertexAttribArray
+#define glFlush                           imgl3wProcs.gl.Flush
+#define glGenBuffers                      imgl3wProcs.gl.GenBuffers
+#define glGenTextures                     imgl3wProcs.gl.GenTextures
+#define glGenVertexArrays                 imgl3wProcs.gl.GenVertexArrays
+#define glGetAttribLocation               imgl3wProcs.gl.GetAttribLocation
+#define glGetError                        imgl3wProcs.gl.GetError
+#define glGetIntegerv                     imgl3wProcs.gl.GetIntegerv
+#define glGetProgramInfoLog               imgl3wProcs.gl.GetProgramInfoLog
+#define glGetProgramiv                    imgl3wProcs.gl.GetProgramiv
+#define glGetShaderInfoLog                imgl3wProcs.gl.GetShaderInfoLog
+#define glGetShaderiv                     imgl3wProcs.gl.GetShaderiv
+#define glGetString                       imgl3wProcs.gl.GetString
+#define glGetStringi                      imgl3wProcs.gl.GetStringi
+#define glGetUniformLocation              imgl3wProcs.gl.GetUniformLocation
+#define glGetVertexAttribPointerv         imgl3wProcs.gl.GetVertexAttribPointerv
+#define glGetVertexAttribiv               imgl3wProcs.gl.GetVertexAttribiv
+#define glIsEnabled                       imgl3wProcs.gl.IsEnabled
+#define glLinkProgram                     imgl3wProcs.gl.LinkProgram
+#define glPixelStorei                     imgl3wProcs.gl.PixelStorei
+#define glPolygonMode                     imgl3wProcs.gl.PolygonMode
+#define glReadPixels                      imgl3wProcs.gl.ReadPixels
+#define glScissor                         imgl3wProcs.gl.Scissor
+#define glShaderSource                    imgl3wProcs.gl.ShaderSource
+#define glTexImage2D                      imgl3wProcs.gl.TexImage2D
+#define glTexParameteri                   imgl3wProcs.gl.TexParameteri
+#define glUniform1i                       imgl3wProcs.gl.Uniform1i
+#define glUniformMatrix4fv                imgl3wProcs.gl.UniformMatrix4fv
+#define glUseProgram                      imgl3wProcs.gl.UseProgram
+#define glVertexAttribPointer             imgl3wProcs.gl.VertexAttribPointer
+#define glViewport                        imgl3wProcs.gl.Viewport
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#ifdef IMGL3W_IMPL
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#define ARRAY_SIZE(x)  (sizeof(x) / sizeof((x)[0]))
+
+#if defined(_WIN32)
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN 1
+#endif
+#include <windows.h>
+
+static HMODULE libgl;
+typedef PROC(__stdcall* GL3WglGetProcAddr)(LPCSTR);
+static GL3WglGetProcAddr wgl_get_proc_address;
+
+static int open_libgl(void)
+{
+    libgl = LoadLibraryA("opengl32.dll");
+    if (!libgl)
+        return GL3W_ERROR_LIBRARY_OPEN;
+    wgl_get_proc_address = (GL3WglGetProcAddr)GetProcAddress(libgl, "wglGetProcAddress");
+    return GL3W_OK;
+}
+
+static void close_libgl(void) { FreeLibrary(libgl); }
+static GL3WglProc get_proc(const char *proc)
+{
+    GL3WglProc res;
+    res = (GL3WglProc)wgl_get_proc_address(proc);
+    if (!res)
+        res = (GL3WglProc)GetProcAddress(libgl, proc);
+    return res;
+}
+#elif defined(__APPLE__)
+#include <dlfcn.h>
+
+static void *libgl;
+static int open_libgl(void)
+{
+    libgl = dlopen("/System/Library/Frameworks/OpenGL.framework/OpenGL", RTLD_LAZY | RTLD_LOCAL);
+    if (!libgl)
+        return GL3W_ERROR_LIBRARY_OPEN;
+    return GL3W_OK;
+}
+
+static void close_libgl(void) { dlclose(libgl); }
+
+static GL3WglProc get_proc(const char *proc)
+{
+    GL3WglProc res;
+    *(void **)(&res) = dlsym(libgl, proc);
+    return res;
+}
+#else
+#include <dlfcn.h>
+
+static void *libgl;
+static GL3WglProc (*glx_get_proc_address)(const GLubyte *);
+
+static int open_libgl(void)
+{
+    libgl = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
+    if (!libgl)
+        return GL3W_ERROR_LIBRARY_OPEN;
+    *(void **)(&glx_get_proc_address) = dlsym(libgl, "glXGetProcAddressARB");
+    return GL3W_OK;
+}
+
+static void close_libgl(void) { dlclose(libgl); }
+
+static GL3WglProc get_proc(const char *proc)
+{
+    GL3WglProc res;
+    res = glx_get_proc_address((const GLubyte *)proc);
+    if (!res)
+        *(void **)(&res) = dlsym(libgl, proc);
+    return res;
+}
+#endif
+
+static struct { int major, minor; } version;
+
+static int parse_version(void)
+{
+    if (!glGetIntegerv)
+        return GL3W_ERROR_INIT;
+    glGetIntegerv(GL_MAJOR_VERSION, &version.major);
+    glGetIntegerv(GL_MINOR_VERSION, &version.minor);
+    if (version.major < 3)
+        return GL3W_ERROR_OPENGL_VERSION;
+    return GL3W_OK;
+}
+
+static void load_procs(GL3WGetProcAddressProc proc);
+
+int imgl3wInit(void)
+{
+    int res = open_libgl();
+    if (res)
+        return res;
+    atexit(close_libgl);
+    return imgl3wInit2(get_proc);
+}
+
+int imgl3wInit2(GL3WGetProcAddressProc proc)
+{
+    load_procs(proc);
+    return parse_version();
+}
+
+int imgl3wIsSupported(int major, int minor)
+{
+    if (major < 3)
+        return 0;
+    if (version.major == major)
+        return version.minor >= minor;
+    return version.major >= major;
+}
+
+GL3WglProc imgl3wGetProcAddress(const char *proc) { return get_proc(proc); }
+
+static const char *proc_names[] = {
+    "glActiveTexture",
+    "glAttachShader",
+    "glBindBuffer",
+    "glBindSampler",
+    "glBindTexture",
+    "glBindVertexArray",
+    "glBlendEquation",
+    "glBlendEquationSeparate",
+    "glBlendFuncSeparate",
+    "glBufferData",
+    "glBufferSubData",
+    "glClear",
+    "glClearColor",
+    "glCompileShader",
+    "glCreateProgram",
+    "glCreateShader",
+    "glDeleteBuffers",
+    "glDeleteProgram",
+    "glDeleteShader",
+    "glDeleteTextures",
+    "glDeleteVertexArrays",
+    "glDetachShader",
+    "glDisable",
+    "glDisableVertexAttribArray",
+    "glDrawElements",
+    "glDrawElementsBaseVertex",
+    "glEnable",
+    "glEnableVertexAttribArray",
+    "glFlush",
+    "glGenBuffers",
+    "glGenTextures",
+    "glGenVertexArrays",
+    "glGetAttribLocation",
+    "glGetError",
+    "glGetIntegerv",
+    "glGetProgramInfoLog",
+    "glGetProgramiv",
+    "glGetShaderInfoLog",
+    "glGetShaderiv",
+    "glGetString",
+    "glGetStringi",
+    "glGetUniformLocation",
+    "glGetVertexAttribPointerv",
+    "glGetVertexAttribiv",
+    "glIsEnabled",
+    "glLinkProgram",
+    "glPixelStorei",
+    "glPolygonMode",
+    "glReadPixels",
+    "glScissor",
+    "glShaderSource",
+    "glTexImage2D",
+    "glTexParameteri",
+    "glUniform1i",
+    "glUniformMatrix4fv",
+    "glUseProgram",
+    "glVertexAttribPointer",
+    "glViewport",
+};
+
+GL3W_API union GL3WProcs imgl3wProcs;
+
+static void load_procs(GL3WGetProcAddressProc proc)
+{
+    size_t i;
+    for (i = 0; i < ARRAY_SIZE(proc_names); i++)
+        imgl3wProcs.ptr[i] = proc(proc_names[i]);
+}
+
+#ifdef __cplusplus
+}
+#endif
+#endif

extern/imgui_patched/backends/imgui_impl_osx.h

@@ -0,0 +1,25 @@
+// dear imgui: Platform Backend for OSX / Cocoa
+// This needs to be used along with a Renderer (e.g. OpenGL2, OpenGL3, Vulkan, Metal..)
+// [ALPHA] Early backend, not well tested. If you want a portable application, prefer using the GLFW or SDL platform Backends on Mac.
+
+// Implemented features:
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy kVK_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+//  [X] Platform: OSX clipboard is supported within core Dear ImGui (no specific code in this backend).
+//  [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [X] Platform: IME support.
+//  [X] Platform: Multi-viewport / platform windows.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#include "imgui.h"      // IMGUI_IMPL_API
+
+@class NSEvent;
+@class NSView;
+
+IMGUI_IMPL_API bool     ImGui_ImplOSX_Init(NSView* _Nonnull view);
+IMGUI_IMPL_API void     ImGui_ImplOSX_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplOSX_NewFrame(NSView* _Nullable view);

extern/imgui_patched/backends/imgui_impl_sdl.cpp

@@ -21,6 +21,8 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2022-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2022-03-22: Inputs: Fix mouse position issues when dragging outside of boundaries. SDL_CaptureMouse() erroneously still gives out LEAVE events when hovering OS decorations.
+//  2022-03-22: Inputs: Added support for extra mouse buttons (SDL_BUTTON_X1/SDL_BUTTON_X2).
 //  2022-02-04: Added SDL_Renderer* parameter to ImGui_ImplSDL2_InitForSDLRenderer(), so we can use SDL_GetRendererOutputSize() instead of SDL_GL_GetDrawableSize() when bound to a SDL_Renderer.
 //  2022-01-26: Inputs: replaced short-lived io.AddKeyModsEvent() (added two weeks ago) with io.AddKeyEvent() using ImGuiKey_ModXXX flags. Sorry for the confusion.
 //  2021-01-20: Inputs: calling new io.AddKeyAnalogEvent() for gamepad support, instead of writing directly to io.NavInputs[].
@@ -76,7 +78,7 @@ extern "C" {
 }
 #endif
 
-#if SDL_VERSION_ATLEAST(2,0,4) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS)
+#if SDL_VERSION_ATLEAST(2,0,4) && !defined(__EMSCRIPTEN__) && !defined(__ANDROID__) && !(defined(__APPLE__) && TARGET_OS_IOS) && !defined(__amigaos4__)
 #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    1
 #else
 #define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE    0
@@ -100,11 +102,12 @@ struct ImGui_ImplSDL2_Data
     Uint32          MouseWindowID;
     int             MouseButtonsDown;
     SDL_Cursor*     MouseCursors[ImGuiMouseCursor_COUNT];
+    int             PendingMouseLeaveFrame;
     char*           ClipboardTextData;
     bool            MouseCanUseGlobalState;
     bool            UseVulkan;
 
-    ImGui_ImplSDL2_Data()   { memset(this, 0, sizeof(*this)); }
+    ImGui_ImplSDL2_Data()   { memset((void*)this, 0, sizeof(*this)); }
 };
 
 // Backend data stored in io.BackendPlatformUserData to allow support for multiple Dear ImGui contexts
@@ -259,8 +262,8 @@ static void ImGui_ImplSDL2_UpdateKeyModifiers(SDL_Keymod sdl_key_mods)
 }
 
 // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
-// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application.
+// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
-// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application.
+// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
 // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
 // If you have multiple SDL events and some of them are not meant to be used by dear imgui, you may need to filter events based on their windowID field.
 bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
@@ -313,6 +316,8 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
             if (event->button.button == SDL_BUTTON_LEFT) { mouse_button = 0; }
             if (event->button.button == SDL_BUTTON_RIGHT) { mouse_button = 1; }
             if (event->button.button == SDL_BUTTON_MIDDLE) { mouse_button = 2; }
+            if (event->button.button == SDL_BUTTON_X1) { mouse_button = 3; }
+            if (event->button.button == SDL_BUTTON_X2) { mouse_button = 4; }
             if (mouse_button == -1)
                 break;
             io.AddMouseButtonEvent(mouse_button, (event->type == SDL_MOUSEBUTTONDOWN));
@@ -335,16 +340,19 @@ bool ImGui_ImplSDL2_ProcessEvent(const SDL_Event* event)
         }
         case SDL_WINDOWEVENT:
         {
-            // When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right.
+            // - When capturing mouse, SDL will send a bunch of conflicting LEAVE/ENTER event on every mouse move, but the final ENTER tends to be right.
-            // However we won't get a correct LEAVE event for a captured window.
+            // - However we won't get a correct LEAVE event for a captured window.
+            // - In some cases, when detaching a window from main viewport SDL may send SDL_WINDOWEVENT_ENTER one frame too late,
+            //   causing SDL_WINDOWEVENT_LEAVE on previous frame to interrupt drag operation by clear mouse position. This is why
+            //   we delay process the SDL_WINDOWEVENT_LEAVE events by one frame. See issue #5012 for details.
             Uint8 window_event = event->window.event;
             if (window_event == SDL_WINDOWEVENT_ENTER)
-                bd->MouseWindowID = event->window.windowID;
-            if (window_event == SDL_WINDOWEVENT_LEAVE)
             {
-                bd->MouseWindowID = 0;
+                bd->MouseWindowID = event->window.windowID;
-                io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
+                bd->PendingMouseLeaveFrame = 0;
             }
+            if (window_event == SDL_WINDOWEVENT_LEAVE)
+                bd->PendingMouseLeaveFrame = ImGui::GetFrameCount() + 1;
             if (window_event == SDL_WINDOWEVENT_FOCUS_GAINED)
                 io.AddFocusEvent(true);
             else if (window_event == SDL_WINDOWEVENT_FOCUS_LOST)
@@ -709,6 +717,13 @@ void ImGui_ImplSDL2_NewFrame()
     io.DeltaTime = bd->Time > 0 ? (float)((double)(current_time - bd->Time) / frequency) : (float)(1.0f / 60.0f);
     bd->Time = current_time;
 
+    if (bd->PendingMouseLeaveFrame && bd->PendingMouseLeaveFrame >= ImGui::GetFrameCount() && bd->MouseButtonsDown == 0)
+    {
+        bd->MouseWindowID = 0;
+        bd->PendingMouseLeaveFrame = 0;
+        io.AddMousePosEvent(-FLT_MAX, -FLT_MAX);
+    }
+
     ImGui_ImplSDL2_UpdateMouseData();
     ImGui_ImplSDL2_UpdateMouseCursor();
 

extern/imgui_patched/backends/imgui_impl_sdlrenderer.cpp

@@ -0,0 +1,252 @@
+// dear imgui: Renderer Backend for SDL_Renderer
+// (Requires: SDL 2.0.17+)
+
+// Important to understand: SDL_Renderer is an _optional_ component of SDL.
+// For a multi-platform app consider using e.g. SDL+DirectX on Windows and SDL+OpenGL on Linux/OSX.
+// If your application will want to render any non trivial amount of graphics other than UI,
+// please be aware that SDL_Renderer offers a limited graphic API to the end-user and it might
+// be difficult to step out of those boundaries.
+// However, we understand it is a convenient choice to get an app started easily.
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+// Missing features:
+//  [ ] Renderer: Multi-viewport support (multiple windows).
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+//  2021-12-21: Update SDL_RenderGeometryRaw() format to work with SDL 2.0.19.
+//  2021-12-03: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2021-10-06: Backup and restore modified ClipRect/Viewport.
+//  2021-09-21: Initial version.
+
+#include "imgui.h"
+#include "imgui_impl_sdlrenderer.h"
+#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
+#include <stddef.h>     // intptr_t
+#else
+#include <stdint.h>     // intptr_t
+#endif
+
+// SDL
+#include <SDL.h>
+#if !SDL_VERSION_ATLEAST(2,0,17)
+#error This backend requires SDL 2.0.17+ because of SDL_RenderGeometry() function
+#endif
+
+// SDL_Renderer data
+struct ImGui_ImplSDLRenderer_Data
+{
+    SDL_Renderer*   SDLRenderer;
+    SDL_Texture*    FontTexture;
+    ImGui_ImplSDLRenderer_Data() { memset((void*)this, 0, sizeof(*this)); }
+};
+
+// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts
+// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts.
+static ImGui_ImplSDLRenderer_Data* ImGui_ImplSDLRenderer_GetBackendData()
+{
+    return ImGui::GetCurrentContext() ? (ImGui_ImplSDLRenderer_Data*)ImGui::GetIO().BackendRendererUserData : NULL;
+}
+
+// Functions
+bool ImGui_ImplSDLRenderer_Init(SDL_Renderer* renderer)
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!");
+    IM_ASSERT(renderer != NULL && "SDL_Renderer not initialized!");
+
+    // Setup backend capabilities flags
+    ImGui_ImplSDLRenderer_Data* bd = IM_NEW(ImGui_ImplSDLRenderer_Data)();
+    io.BackendRendererUserData = (void*)bd;
+    io.BackendRendererName = "imgui_impl_sdlrenderer";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+
+    bd->SDLRenderer = renderer;
+
+    return true;
+}
+
+void ImGui_ImplSDLRenderer_Shutdown()
+{
+    ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+    IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?");
+    ImGuiIO& io = ImGui::GetIO();
+
+    ImGui_ImplSDLRenderer_DestroyDeviceObjects();
+
+    io.BackendRendererName = NULL;
+    io.BackendRendererUserData = NULL;
+    IM_DELETE(bd);
+}
+
+static void ImGui_ImplSDLRenderer_SetupRenderState()
+{
+	ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+
+	// Clear out any viewports and cliprect set by the user
+    // FIXME: Technically speaking there are lots of other things we could backup/setup/restore during our render process.
+	SDL_RenderSetViewport(bd->SDLRenderer, NULL);
+	SDL_RenderSetClipRect(bd->SDLRenderer, NULL);
+}
+
+void ImGui_ImplSDLRenderer_NewFrame()
+{
+    ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+    IM_ASSERT(bd != NULL && "Did you call ImGui_ImplSDLRenderer_Init()?");
+
+    if (!bd->FontTexture)
+        ImGui_ImplSDLRenderer_CreateDeviceObjects();
+}
+
+void ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data)
+{
+	ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+
+	// If there's a scale factor set by the user, use that instead
+    // If the user has specified a scale factor to SDL_Renderer already via SDL_RenderSetScale(), SDL will scale whatever we pass
+    // to SDL_RenderGeometryRaw() by that scale factor. In that case we don't want to be also scaling it ourselves here.
+    float rsx = 1.0f;
+	float rsy = 1.0f;
+	SDL_RenderGetScale(bd->SDLRenderer, &rsx, &rsy);
+    ImVec2 render_scale;
+	render_scale.x = (rsx == 1.0f) ? draw_data->FramebufferScale.x : 1.0f;
+	render_scale.y = (rsy == 1.0f) ? draw_data->FramebufferScale.y : 1.0f;
+
+	// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+	int fb_width = (int)(draw_data->DisplaySize.x * render_scale.x);
+	int fb_height = (int)(draw_data->DisplaySize.y * render_scale.y);
+	if (fb_width == 0 || fb_height == 0)
+		return;
+
+    // Backup SDL_Renderer state that will be modified to restore it afterwards
+    struct BackupSDLRendererState
+    {
+        SDL_Rect    Viewport;
+        bool        ClipEnabled;
+        SDL_Rect    ClipRect;
+    };
+    BackupSDLRendererState old = {};
+    old.ClipEnabled = SDL_RenderIsClipEnabled(bd->SDLRenderer) == SDL_TRUE;
+    SDL_RenderGetViewport(bd->SDLRenderer, &old.Viewport);
+    SDL_RenderGetClipRect(bd->SDLRenderer, &old.ClipRect);
+
+	// Will project scissor/clipping rectangles into framebuffer space
+	ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
+	ImVec2 clip_scale = render_scale;
+
+    // Render command lists
+    ImGui_ImplSDLRenderer_SetupRenderState();
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        const ImDrawVert* vtx_buffer = cmd_list->VtxBuffer.Data;
+        const ImDrawIdx* idx_buffer = cmd_list->IdxBuffer.Data;
+
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplSDLRenderer_SetupRenderState();
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
+                ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
+                if (clip_min.x < 0.0f) { clip_min.x = 0.0f; }
+                if (clip_min.y < 0.0f) { clip_min.y = 0.0f; }
+                if (clip_max.x > fb_width) { clip_max.x = (float)fb_width; }
+                if (clip_max.y > fb_height) { clip_max.y = (float)fb_height; }
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                SDL_Rect r = { (int)(clip_min.x), (int)(clip_min.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y) };
+                SDL_RenderSetClipRect(bd->SDLRenderer, &r);
+
+                const float* xy = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, pos));
+                const float* uv = (const float*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, uv));
+#if SDL_VERSION_ATLEAST(2,0,19)
+                const SDL_Color* color = (const SDL_Color*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.19+
+#else
+                const int* color = (const int*)((const char*)(vtx_buffer + pcmd->VtxOffset) + IM_OFFSETOF(ImDrawVert, col)); // SDL 2.0.17 and 2.0.18
+#endif
+
+                // Bind texture, Draw
+				SDL_Texture* tex = (SDL_Texture*)pcmd->GetTexID();
+                SDL_SetTextureScaleMode(tex, SDL_ScaleModeBest); // ???
+                SDL_RenderGeometryRaw(bd->SDLRenderer, tex,
+                    xy, (int)sizeof(ImDrawVert),
+                    color, (int)sizeof(ImDrawVert),
+                    uv, (int)sizeof(ImDrawVert),
+                    cmd_list->VtxBuffer.Size - pcmd->VtxOffset,
+                    idx_buffer + pcmd->IdxOffset, pcmd->ElemCount, sizeof(ImDrawIdx));
+            }
+        }
+    }
+
+    // Restore modified SDL_Renderer state
+    SDL_RenderSetViewport(bd->SDLRenderer, &old.Viewport);
+    SDL_RenderSetClipRect(bd->SDLRenderer, old.ClipEnabled ? &old.ClipRect : NULL);
+}
+
+// Called by Init/NewFrame/Shutdown
+bool ImGui_ImplSDLRenderer_CreateFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+
+    // Build texture atlas
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
+
+    // Upload texture to graphics system
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    bd->FontTexture = SDL_CreateTexture(bd->SDLRenderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STATIC, width, height);
+    if (bd->FontTexture == NULL)
+    {
+        SDL_Log("error creating texture");
+        return false;
+    }
+    SDL_UpdateTexture(bd->FontTexture, NULL, pixels, 4 * width);
+    SDL_SetTextureBlendMode(bd->FontTexture, SDL_BLENDMODE_BLEND);
+    SDL_SetTextureScaleMode(bd->FontTexture, SDL_ScaleModeLinear);
+
+    // Store our identifier
+    io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture);
+
+    return true;
+}
+
+void ImGui_ImplSDLRenderer_DestroyFontsTexture()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    ImGui_ImplSDLRenderer_Data* bd = ImGui_ImplSDLRenderer_GetBackendData();
+    if (bd->FontTexture)
+    {
+        io.Fonts->SetTexID(0);
+        SDL_DestroyTexture(bd->FontTexture);
+        bd->FontTexture = NULL;
+    }
+}
+
+bool ImGui_ImplSDLRenderer_CreateDeviceObjects()
+{
+    return ImGui_ImplSDLRenderer_CreateFontsTexture();
+}
+
+void ImGui_ImplSDLRenderer_DestroyDeviceObjects()
+{
+    ImGui_ImplSDLRenderer_DestroyFontsTexture();
+}

extern/imgui_patched/backends/imgui_impl_sdlrenderer.h

@@ -0,0 +1,31 @@
+// dear imgui: Renderer Backend for SDL_Renderer
+// (Requires: SDL 2.0.17+)
+
+// Important to understand: SDL_Renderer is an _optional_ component of SDL.
+// For a multi-platform app consider using e.g. SDL+DirectX on Windows and SDL+OpenGL on Linux/OSX.
+// If your application will want to render any non trivial amount of graphics other than UI,
+// please be aware that SDL_Renderer offers a limited graphic API to the end-user and it might
+// be difficult to step out of those boundaries.
+// However, we understand it is a convenient choice to get an app started easily.
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'SDL_Texture*' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+// Missing features:
+//  [ ] Renderer: Multi-viewport support (multiple windows).
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct SDL_Renderer;
+
+IMGUI_IMPL_API bool     ImGui_ImplSDLRenderer_Init(SDL_Renderer* renderer);
+IMGUI_IMPL_API void     ImGui_ImplSDLRenderer_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplSDLRenderer_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplSDLRenderer_RenderDrawData(ImDrawData* draw_data);
+
+// Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool     ImGui_ImplSDLRenderer_CreateFontsTexture();
+IMGUI_IMPL_API void     ImGui_ImplSDLRenderer_DestroyFontsTexture();
+IMGUI_IMPL_API bool     ImGui_ImplSDLRenderer_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplSDLRenderer_DestroyDeviceObjects();

extern/imgui_patched/backends/imgui_impl_vulkan.h

@@ -0,0 +1,156 @@
+// dear imgui: Renderer Backend for Vulkan
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+//  [x] Renderer: Multi-viewport / platform windows. With issues (flickering when creating a new viewport).
+//  [!] Renderer: User texture binding. Use 'VkDescriptorSet' as ImTextureID. Read the FAQ about ImTextureID! See https://github.com/ocornut/imgui/pull/914 for discussions.
+
+// Important: on 32-bit systems, user texture binding is only supported if your imconfig file has '#define ImTextureID ImU64'.
+// See imgui_impl_vulkan.cpp file for details.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// The aim of imgui_impl_vulkan.h/.cpp is to be usable in your engine without any modification.
+// IF YOU FEEL YOU NEED TO MAKE ANY CHANGE TO THIS CODE, please share them and your feedback at https://github.com/ocornut/imgui/
+
+// Important note to the reader who wish to integrate imgui_impl_vulkan.cpp/.h in their own engine/app.
+// - Common ImGui_ImplVulkan_XXX functions and structures are used to interface with imgui_impl_vulkan.cpp/.h.
+//   You will use those if you want to use this rendering backend in your engine/app.
+// - Helper ImGui_ImplVulkanH_XXX functions and structures are only used by this example (main.cpp) and by
+//   the backend itself (imgui_impl_vulkan.cpp), but should PROBABLY NOT be used by your own engine/app code.
+// Read comments in imgui_impl_vulkan.h.
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+// [Configuration] in order to use a custom Vulkan function loader:
+// (1) You'll need to disable default Vulkan function prototypes.
+//     We provide a '#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES' convenience configuration flag.
+//     In order to make sure this is visible from the imgui_impl_vulkan.cpp compilation unit:
+//     - Add '#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES' in your imconfig.h file
+//     - Or as a compilation flag in your build system
+//     - Or uncomment here (not recommended because you'd be modifying imgui sources!)
+//     - Do not simply add it in a .cpp file!
+// (2) Call ImGui_ImplVulkan_LoadFunctions() before ImGui_ImplVulkan_Init() with your custom function.
+// If you have no idea what this is, leave it alone!
+//#define IMGUI_IMPL_VULKAN_NO_PROTOTYPES
+
+// Vulkan includes
+#if defined(IMGUI_IMPL_VULKAN_NO_PROTOTYPES) && !defined(VK_NO_PROTOTYPES)
+#define VK_NO_PROTOTYPES
+#endif
+#include <vulkan/vulkan.h>
+
+// Initialization data, for ImGui_ImplVulkan_Init()
+// [Please zero-clear before use!]
+struct ImGui_ImplVulkan_InitInfo
+{
+    VkInstance                      Instance;
+    VkPhysicalDevice                PhysicalDevice;
+    VkDevice                        Device;
+    uint32_t                        QueueFamily;
+    VkQueue                         Queue;
+    VkPipelineCache                 PipelineCache;
+    VkDescriptorPool                DescriptorPool;
+    uint32_t                        Subpass;
+    uint32_t                        MinImageCount;          // >= 2
+    uint32_t                        ImageCount;             // >= MinImageCount
+    VkSampleCountFlagBits           MSAASamples;            // >= VK_SAMPLE_COUNT_1_BIT (0 -> default to VK_SAMPLE_COUNT_1_BIT)
+    const VkAllocationCallbacks*    Allocator;
+    void                            (*CheckVkResultFn)(VkResult err);
+};
+
+// Called by user code
+IMGUI_IMPL_API bool         ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo* info, VkRenderPass render_pass);
+IMGUI_IMPL_API void         ImGui_ImplVulkan_Shutdown();
+IMGUI_IMPL_API void         ImGui_ImplVulkan_NewFrame();
+IMGUI_IMPL_API void         ImGui_ImplVulkan_RenderDrawData(ImDrawData* draw_data, VkCommandBuffer command_buffer, VkPipeline pipeline = VK_NULL_HANDLE);
+IMGUI_IMPL_API bool         ImGui_ImplVulkan_CreateFontsTexture(VkCommandBuffer command_buffer);
+IMGUI_IMPL_API void         ImGui_ImplVulkan_DestroyFontUploadObjects();
+IMGUI_IMPL_API void         ImGui_ImplVulkan_SetMinImageCount(uint32_t min_image_count); // To override MinImageCount after initialization (e.g. if swap chain is recreated)
+
+// Register a texture (VkDescriptorSet == ImTextureID)
+// FIXME: This is experimental in the sense that we are unsure how to best design/tackle this problem, please post to https://github.com/ocornut/imgui/pull/914 if you have suggestions.
+IMGUI_IMPL_API VkDescriptorSet ImGui_ImplVulkan_AddTexture(VkSampler sampler, VkImageView image_view, VkImageLayout image_layout);
+
+// Optional: load Vulkan functions with a custom function loader
+// This is only useful with IMGUI_IMPL_VULKAN_NO_PROTOTYPES / VK_NO_PROTOTYPES
+IMGUI_IMPL_API bool         ImGui_ImplVulkan_LoadFunctions(PFN_vkVoidFunction(*loader_func)(const char* function_name, void* user_data), void* user_data = NULL);
+
+//-------------------------------------------------------------------------
+// Internal / Miscellaneous Vulkan Helpers
+// (Used by example's main.cpp. Used by multi-viewport features. PROBABLY NOT used by your own engine/app.)
+//-------------------------------------------------------------------------
+// You probably do NOT need to use or care about those functions.
+// Those functions only exist because:
+//   1) they facilitate the readability and maintenance of the multiple main.cpp examples files.
+//   2) the multi-viewport / platform window implementation needs them internally.
+// Generally we avoid exposing any kind of superfluous high-level helpers in the bindings,
+// but it is too much code to duplicate everywhere so we exceptionally expose them.
+//
+// Your engine/app will likely _already_ have code to setup all that stuff (swap chain, render pass, frame buffers, etc.).
+// You may read this code to learn about Vulkan, but it is recommended you use you own custom tailored code to do equivalent work.
+// (The ImGui_ImplVulkanH_XXX functions do not interact with any of the state used by the regular ImGui_ImplVulkan_XXX functions)
+//-------------------------------------------------------------------------
+
+struct ImGui_ImplVulkanH_Frame;
+struct ImGui_ImplVulkanH_Window;
+
+// Helpers
+IMGUI_IMPL_API void                 ImGui_ImplVulkanH_CreateOrResizeWindow(VkInstance instance, VkPhysicalDevice physical_device, VkDevice device, ImGui_ImplVulkanH_Window* wnd, uint32_t queue_family, const VkAllocationCallbacks* allocator, int w, int h, uint32_t min_image_count);
+IMGUI_IMPL_API void                 ImGui_ImplVulkanH_DestroyWindow(VkInstance instance, VkDevice device, ImGui_ImplVulkanH_Window* wnd, const VkAllocationCallbacks* allocator);
+IMGUI_IMPL_API VkSurfaceFormatKHR   ImGui_ImplVulkanH_SelectSurfaceFormat(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkFormat* request_formats, int request_formats_count, VkColorSpaceKHR request_color_space);
+IMGUI_IMPL_API VkPresentModeKHR     ImGui_ImplVulkanH_SelectPresentMode(VkPhysicalDevice physical_device, VkSurfaceKHR surface, const VkPresentModeKHR* request_modes, int request_modes_count);
+IMGUI_IMPL_API int                  ImGui_ImplVulkanH_GetMinImageCountFromPresentMode(VkPresentModeKHR present_mode);
+
+// Helper structure to hold the data needed by one rendering frame
+// (Used by example's main.cpp. Used by multi-viewport features. Probably NOT used by your own engine/app.)
+// [Please zero-clear before use!]
+struct ImGui_ImplVulkanH_Frame
+{
+    VkCommandPool       CommandPool;
+    VkCommandBuffer     CommandBuffer;
+    VkFence             Fence;
+    VkImage             Backbuffer;
+    VkImageView         BackbufferView;
+    VkFramebuffer       Framebuffer;
+};
+
+struct ImGui_ImplVulkanH_FrameSemaphores
+{
+    VkSemaphore         ImageAcquiredSemaphore;
+    VkSemaphore         RenderCompleteSemaphore;
+};
+
+// Helper structure to hold the data needed by one rendering context into one OS window
+// (Used by example's main.cpp. Used by multi-viewport features. Probably NOT used by your own engine/app.)
+struct ImGui_ImplVulkanH_Window
+{
+    int                 Width;
+    int                 Height;
+    VkSwapchainKHR      Swapchain;
+    VkSurfaceKHR        Surface;
+    VkSurfaceFormatKHR  SurfaceFormat;
+    VkPresentModeKHR    PresentMode;
+    VkRenderPass        RenderPass;
+    VkPipeline          Pipeline;               // The window pipeline may uses a different VkRenderPass than the one passed in ImGui_ImplVulkan_InitInfo
+    bool                ClearEnable;
+    VkClearValue        ClearValue;
+    uint32_t            FrameIndex;             // Current frame being rendered to (0 <= FrameIndex < FrameInFlightCount)
+    uint32_t            ImageCount;             // Number of simultaneous in-flight frames (returned by vkGetSwapchainImagesKHR, usually derived from min_image_count)
+    uint32_t            SemaphoreIndex;         // Current set of swapchain wait semaphores we're using (needs to be distinct from per frame data)
+    ImGui_ImplVulkanH_Frame*            Frames;
+    ImGui_ImplVulkanH_FrameSemaphores*  FrameSemaphores;
+
+    ImGui_ImplVulkanH_Window()
+    {
+        memset((void*)this, 0, sizeof(*this));
+        PresentMode = (VkPresentModeKHR)~0;     // Ensure we get an error if user doesn't set this.
+        ClearEnable = true;
+    }
+};
+

extern/imgui_patched/backends/imgui_impl_wgpu.cpp

@@ -0,0 +1,719 @@
+// dear imgui: Renderer for WebGPU
+// This needs to be used along with a Platform Binding (e.g. GLFW)
+// (Please note that WebGPU is currently experimental, will not run on non-beta browsers, and may break.)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'WGPUTextureView' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2021-11-29: Passing explicit buffer sizes to wgpuRenderPassEncoderSetVertexBuffer()/wgpuRenderPassEncoderSetIndexBuffer().
+//  2021-08-24: Fix for latest specs.
+//  2021-05-24: Add support for draw_data->FramebufferScale.
+//  2021-05-19: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement)
+//  2021-05-16: Update to latest WebGPU specs (compatible with Emscripten 2.0.20 and Chrome Canary 92).
+//  2021-02-18: Change blending equation to preserve alpha in output buffer.
+//  2021-01-28: Initial version.
+
+#include "imgui.h"
+#include "imgui_impl_wgpu.h"
+#include <limits.h>
+#include <webgpu/webgpu.h>
+
+#define HAS_EMSCRIPTEN_VERSION(major, minor, tiny) (__EMSCRIPTEN_major__ > (major) || (__EMSCRIPTEN_major__ == (major) && __EMSCRIPTEN_minor__ > (minor)) || (__EMSCRIPTEN_major__ == (major) && __EMSCRIPTEN_minor__ == (minor) && __EMSCRIPTEN_tiny__ >= (tiny)))
+
+#if defined(__EMSCRIPTEN__) && !HAS_EMSCRIPTEN_VERSION(2, 0, 20)
+#error "Requires at least emscripten 2.0.20"
+#endif
+
+// Dear ImGui prototypes from imgui_internal.h
+extern ImGuiID ImHashData(const void* data_p, size_t data_size, ImU32 seed = 0);
+
+// WebGPU data
+static WGPUDevice               g_wgpuDevice = NULL;
+static WGPUQueue                g_defaultQueue = NULL;
+static WGPUTextureFormat        g_renderTargetFormat = WGPUTextureFormat_Undefined;
+static WGPURenderPipeline       g_pipelineState = NULL;
+
+struct RenderResources
+{
+    WGPUTexture         FontTexture;            // Font texture
+    WGPUTextureView     FontTextureView;        // Texture view for font texture
+    WGPUSampler         Sampler;                // Sampler for the font texture
+    WGPUBuffer          Uniforms;               // Shader uniforms
+    WGPUBindGroup       CommonBindGroup;        // Resources bind-group to bind the common resources to pipeline
+    ImGuiStorage        ImageBindGroups;        // Resources bind-group to bind the font/image resources to pipeline (this is a key->value map)
+    WGPUBindGroup       ImageBindGroup;         // Default font-resource of Dear ImGui
+    WGPUBindGroupLayout ImageBindGroupLayout;   // Cache layout used for the image bind group. Avoids allocating unnecessary JS objects when working with WebASM
+};
+static RenderResources  g_resources;
+
+struct FrameResources
+{
+    WGPUBuffer  IndexBuffer;
+    WGPUBuffer  VertexBuffer;
+    ImDrawIdx*  IndexBufferHost;
+    ImDrawVert* VertexBufferHost;
+    int         IndexBufferSize;
+    int         VertexBufferSize;
+};
+static FrameResources*  g_pFrameResources = NULL;
+static unsigned int     g_numFramesInFlight = 0;
+static unsigned int     g_frameIndex = UINT_MAX;
+
+struct Uniforms
+{
+    float MVP[4][4];
+};
+
+//-----------------------------------------------------------------------------
+// SHADERS
+//-----------------------------------------------------------------------------
+
+// glsl_shader.vert, compiled with:
+// # glslangValidator -V -x -o glsl_shader.vert.u32 glsl_shader.vert
+/*
+#version 450 core
+layout(location = 0) in vec2 aPos;
+layout(location = 1) in vec2 aUV;
+layout(location = 2) in vec4 aColor;
+layout(set=0, binding = 0) uniform transform { mat4 mvp; };
+
+out gl_PerVertex { vec4 gl_Position; };
+layout(location = 0) out struct { vec4 Color; vec2 UV; } Out;
+
+void main()
+{
+    Out.Color = aColor;
+    Out.UV = aUV;
+    gl_Position = mvp * vec4(aPos, 0, 1);
+}
+*/
+static uint32_t __glsl_shader_vert_spv[] =
+{
+    0x07230203,0x00010000,0x00080007,0x0000002c,0x00000000,0x00020011,0x00000001,0x0006000b,
+    0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001,
+    0x000a000f,0x00000000,0x00000004,0x6e69616d,0x00000000,0x0000000b,0x0000000f,0x00000015,
+    0x0000001b,0x00000023,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d,
+    0x00000000,0x00030005,0x00000009,0x00000000,0x00050006,0x00000009,0x00000000,0x6f6c6f43,
+    0x00000072,0x00040006,0x00000009,0x00000001,0x00005655,0x00030005,0x0000000b,0x0074754f,
+    0x00040005,0x0000000f,0x6c6f4361,0x0000726f,0x00030005,0x00000015,0x00565561,0x00060005,
+    0x00000019,0x505f6c67,0x65567265,0x78657472,0x00000000,0x00060006,0x00000019,0x00000000,
+    0x505f6c67,0x7469736f,0x006e6f69,0x00030005,0x0000001b,0x00000000,0x00050005,0x0000001d,
+    0x6e617274,0x726f6673,0x0000006d,0x00040006,0x0000001d,0x00000000,0x0070766d,0x00030005,
+    0x0000001f,0x00000000,0x00040005,0x00000023,0x736f5061,0x00000000,0x00040047,0x0000000b,
+    0x0000001e,0x00000000,0x00040047,0x0000000f,0x0000001e,0x00000002,0x00040047,0x00000015,
+    0x0000001e,0x00000001,0x00050048,0x00000019,0x00000000,0x0000000b,0x00000000,0x00030047,
+    0x00000019,0x00000002,0x00040048,0x0000001d,0x00000000,0x00000005,0x00050048,0x0000001d,
+    0x00000000,0x00000023,0x00000000,0x00050048,0x0000001d,0x00000000,0x00000007,0x00000010,
+    0x00030047,0x0000001d,0x00000002,0x00040047,0x0000001f,0x00000022,0x00000000,0x00040047,
+    0x0000001f,0x00000021,0x00000000,0x00040047,0x00000023,0x0000001e,0x00000000,0x00020013,
+    0x00000002,0x00030021,0x00000003,0x00000002,0x00030016,0x00000006,0x00000020,0x00040017,
+    0x00000007,0x00000006,0x00000004,0x00040017,0x00000008,0x00000006,0x00000002,0x0004001e,
+    0x00000009,0x00000007,0x00000008,0x00040020,0x0000000a,0x00000003,0x00000009,0x0004003b,
+    0x0000000a,0x0000000b,0x00000003,0x00040015,0x0000000c,0x00000020,0x00000001,0x0004002b,
+    0x0000000c,0x0000000d,0x00000000,0x00040020,0x0000000e,0x00000001,0x00000007,0x0004003b,
+    0x0000000e,0x0000000f,0x00000001,0x00040020,0x00000011,0x00000003,0x00000007,0x0004002b,
+    0x0000000c,0x00000013,0x00000001,0x00040020,0x00000014,0x00000001,0x00000008,0x0004003b,
+    0x00000014,0x00000015,0x00000001,0x00040020,0x00000017,0x00000003,0x00000008,0x0003001e,
+    0x00000019,0x00000007,0x00040020,0x0000001a,0x00000003,0x00000019,0x0004003b,0x0000001a,
+    0x0000001b,0x00000003,0x00040018,0x0000001c,0x00000007,0x00000004,0x0003001e,0x0000001d,
+    0x0000001c,0x00040020,0x0000001e,0x00000002,0x0000001d,0x0004003b,0x0000001e,0x0000001f,
+    0x00000002,0x00040020,0x00000020,0x00000002,0x0000001c,0x0004003b,0x00000014,0x00000023,
+    0x00000001,0x0004002b,0x00000006,0x00000025,0x00000000,0x0004002b,0x00000006,0x00000026,
+    0x3f800000,0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005,
+    0x0004003d,0x00000007,0x00000010,0x0000000f,0x00050041,0x00000011,0x00000012,0x0000000b,
+    0x0000000d,0x0003003e,0x00000012,0x00000010,0x0004003d,0x00000008,0x00000016,0x00000015,
+    0x00050041,0x00000017,0x00000018,0x0000000b,0x00000013,0x0003003e,0x00000018,0x00000016,
+    0x00050041,0x00000020,0x00000021,0x0000001f,0x0000000d,0x0004003d,0x0000001c,0x00000022,
+    0x00000021,0x0004003d,0x00000008,0x00000024,0x00000023,0x00050051,0x00000006,0x00000027,
+    0x00000024,0x00000000,0x00050051,0x00000006,0x00000028,0x00000024,0x00000001,0x00070050,
+    0x00000007,0x00000029,0x00000027,0x00000028,0x00000025,0x00000026,0x00050091,0x00000007,
+    0x0000002a,0x00000022,0x00000029,0x00050041,0x00000011,0x0000002b,0x0000001b,0x0000000d,
+    0x0003003e,0x0000002b,0x0000002a,0x000100fd,0x00010038
+};
+
+// glsl_shader.frag, compiled with:
+// # glslangValidator -V -x -o glsl_shader.frag.u32 glsl_shader.frag
+/*
+#version 450 core
+layout(location = 0) out vec4 fColor;
+layout(set=0, binding=1) uniform sampler s;
+layout(set=1, binding=0) uniform texture2D t;
+layout(location = 0) in struct { vec4 Color; vec2 UV; } In;
+void main()
+{
+    fColor = In.Color * texture(sampler2D(t, s), In.UV.st);
+}
+*/
+static uint32_t __glsl_shader_frag_spv[] =
+{
+    0x07230203,0x00010000,0x00080007,0x00000023,0x00000000,0x00020011,0x00000001,0x0006000b,
+    0x00000001,0x4c534c47,0x6474732e,0x3035342e,0x00000000,0x0003000e,0x00000000,0x00000001,
+    0x0007000f,0x00000004,0x00000004,0x6e69616d,0x00000000,0x00000009,0x0000000d,0x00030010,
+    0x00000004,0x00000007,0x00030003,0x00000002,0x000001c2,0x00040005,0x00000004,0x6e69616d,
+    0x00000000,0x00040005,0x00000009,0x6c6f4366,0x0000726f,0x00030005,0x0000000b,0x00000000,
+    0x00050006,0x0000000b,0x00000000,0x6f6c6f43,0x00000072,0x00040006,0x0000000b,0x00000001,
+    0x00005655,0x00030005,0x0000000d,0x00006e49,0x00030005,0x00000015,0x00000074,0x00030005,
+    0x00000019,0x00000073,0x00040047,0x00000009,0x0000001e,0x00000000,0x00040047,0x0000000d,
+    0x0000001e,0x00000000,0x00040047,0x00000015,0x00000022,0x00000001,0x00040047,0x00000015,
+    0x00000021,0x00000000,0x00040047,0x00000019,0x00000022,0x00000000,0x00040047,0x00000019,
+    0x00000021,0x00000001,0x00020013,0x00000002,0x00030021,0x00000003,0x00000002,0x00030016,
+    0x00000006,0x00000020,0x00040017,0x00000007,0x00000006,0x00000004,0x00040020,0x00000008,
+    0x00000003,0x00000007,0x0004003b,0x00000008,0x00000009,0x00000003,0x00040017,0x0000000a,
+    0x00000006,0x00000002,0x0004001e,0x0000000b,0x00000007,0x0000000a,0x00040020,0x0000000c,
+    0x00000001,0x0000000b,0x0004003b,0x0000000c,0x0000000d,0x00000001,0x00040015,0x0000000e,
+    0x00000020,0x00000001,0x0004002b,0x0000000e,0x0000000f,0x00000000,0x00040020,0x00000010,
+    0x00000001,0x00000007,0x00090019,0x00000013,0x00000006,0x00000001,0x00000000,0x00000000,
+    0x00000000,0x00000001,0x00000000,0x00040020,0x00000014,0x00000000,0x00000013,0x0004003b,
+    0x00000014,0x00000015,0x00000000,0x0002001a,0x00000017,0x00040020,0x00000018,0x00000000,
+    0x00000017,0x0004003b,0x00000018,0x00000019,0x00000000,0x0003001b,0x0000001b,0x00000013,
+    0x0004002b,0x0000000e,0x0000001d,0x00000001,0x00040020,0x0000001e,0x00000001,0x0000000a,
+    0x00050036,0x00000002,0x00000004,0x00000000,0x00000003,0x000200f8,0x00000005,0x00050041,
+    0x00000010,0x00000011,0x0000000d,0x0000000f,0x0004003d,0x00000007,0x00000012,0x00000011,
+    0x0004003d,0x00000013,0x00000016,0x00000015,0x0004003d,0x00000017,0x0000001a,0x00000019,
+    0x00050056,0x0000001b,0x0000001c,0x00000016,0x0000001a,0x00050041,0x0000001e,0x0000001f,
+    0x0000000d,0x0000001d,0x0004003d,0x0000000a,0x00000020,0x0000001f,0x00050057,0x00000007,
+    0x00000021,0x0000001c,0x00000020,0x00050085,0x00000007,0x00000022,0x00000012,0x00000021,
+    0x0003003e,0x00000009,0x00000022,0x000100fd,0x00010038
+};
+
+static void SafeRelease(ImDrawIdx*& res)
+{
+    if (res)
+        delete[] res;
+    res = NULL;
+}
+static void SafeRelease(ImDrawVert*& res)
+{
+    if (res)
+        delete[] res;
+    res = NULL;
+}
+static void SafeRelease(WGPUBindGroupLayout& res)
+{
+    if (res)
+        wgpuBindGroupLayoutRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUBindGroup& res)
+{
+    if (res)
+        wgpuBindGroupRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUBuffer& res)
+{
+    if (res)
+        wgpuBufferRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPURenderPipeline& res)
+{
+    if (res)
+        wgpuRenderPipelineRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUSampler& res)
+{
+    if (res)
+        wgpuSamplerRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUShaderModule& res)
+{
+    if (res)
+        wgpuShaderModuleRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUTextureView& res)
+{
+    if (res)
+        wgpuTextureViewRelease(res);
+    res = NULL;
+}
+static void SafeRelease(WGPUTexture& res)
+{
+    if (res)
+        wgpuTextureRelease(res);
+    res = NULL;
+}
+
+static void SafeRelease(RenderResources& res)
+{
+    SafeRelease(res.FontTexture);
+    SafeRelease(res.FontTextureView);
+    SafeRelease(res.Sampler);
+    SafeRelease(res.Uniforms);
+    SafeRelease(res.CommonBindGroup);
+    SafeRelease(res.ImageBindGroup);
+    SafeRelease(res.ImageBindGroupLayout);
+};
+
+static void SafeRelease(FrameResources& res)
+{
+    SafeRelease(res.IndexBuffer);
+    SafeRelease(res.VertexBuffer);
+    SafeRelease(res.IndexBufferHost);
+    SafeRelease(res.VertexBufferHost);
+}
+
+static WGPUProgrammableStageDescriptor ImGui_ImplWGPU_CreateShaderModule(uint32_t* binary_data, uint32_t binary_data_size)
+{
+    WGPUShaderModuleSPIRVDescriptor spirv_desc = {};
+    spirv_desc.chain.sType = WGPUSType_ShaderModuleSPIRVDescriptor;
+    spirv_desc.codeSize = binary_data_size;
+    spirv_desc.code = binary_data;
+
+    WGPUShaderModuleDescriptor desc = {};
+    desc.nextInChain = reinterpret_cast<WGPUChainedStruct*>(&spirv_desc);
+
+    WGPUProgrammableStageDescriptor stage_desc = {};
+    stage_desc.module = wgpuDeviceCreateShaderModule(g_wgpuDevice, &desc);
+    stage_desc.entryPoint = "main";
+    return stage_desc;
+}
+
+static WGPUBindGroup ImGui_ImplWGPU_CreateImageBindGroup(WGPUBindGroupLayout layout, WGPUTextureView texture)
+{
+    WGPUBindGroupEntry image_bg_entries[] = { { nullptr, 0, 0, 0, 0, 0, texture } };
+
+    WGPUBindGroupDescriptor image_bg_descriptor = {};
+    image_bg_descriptor.layout = layout;
+    image_bg_descriptor.entryCount = sizeof(image_bg_entries) / sizeof(WGPUBindGroupEntry);
+    image_bg_descriptor.entries = image_bg_entries;
+    return wgpuDeviceCreateBindGroup(g_wgpuDevice, &image_bg_descriptor);
+}
+
+static void ImGui_ImplWGPU_SetupRenderState(ImDrawData* draw_data, WGPURenderPassEncoder ctx, FrameResources* fr)
+{
+    // Setup orthographic projection matrix into our constant buffer
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
+    {
+        float L = draw_data->DisplayPos.x;
+        float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+        float T = draw_data->DisplayPos.y;
+        float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+        float mvp[4][4] =
+        {
+            { 2.0f/(R-L),   0.0f,           0.0f,       0.0f },
+            { 0.0f,         2.0f/(T-B),     0.0f,       0.0f },
+            { 0.0f,         0.0f,           0.5f,       0.0f },
+            { (R+L)/(L-R),  (T+B)/(B-T),    0.5f,       1.0f },
+        };
+        wgpuQueueWriteBuffer(g_defaultQueue, g_resources.Uniforms, 0, mvp, sizeof(mvp));
+    }
+
+    // Setup viewport
+    wgpuRenderPassEncoderSetViewport(ctx, 0, 0, draw_data->FramebufferScale.x * draw_data->DisplaySize.x, draw_data->FramebufferScale.y * draw_data->DisplaySize.y, 0, 1);
+
+    // Bind shader and vertex buffers
+    wgpuRenderPassEncoderSetVertexBuffer(ctx, 0, fr->VertexBuffer, 0, fr->VertexBufferSize * sizeof(ImDrawVert));
+    wgpuRenderPassEncoderSetIndexBuffer(ctx, fr->IndexBuffer, sizeof(ImDrawIdx) == 2 ? WGPUIndexFormat_Uint16 : WGPUIndexFormat_Uint32, 0, fr->IndexBufferSize * sizeof(ImDrawIdx));
+    wgpuRenderPassEncoderSetPipeline(ctx, g_pipelineState);
+    wgpuRenderPassEncoderSetBindGroup(ctx, 0, g_resources.CommonBindGroup, 0, NULL);
+
+    // Setup blend factor
+    WGPUColor blend_color = { 0.f, 0.f, 0.f, 0.f };
+    wgpuRenderPassEncoderSetBlendConstant(ctx, &blend_color);
+}
+
+// Render function
+// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop)
+void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder)
+{
+    // Avoid rendering when minimized
+    if (draw_data->DisplaySize.x <= 0.0f || draw_data->DisplaySize.y <= 0.0f)
+        return;
+
+    // FIXME: Assuming that this only gets called once per frame!
+    // If not, we can't just re-allocate the IB or VB, we'll have to do a proper allocator.
+    g_frameIndex = g_frameIndex + 1;
+    FrameResources* fr = &g_pFrameResources[g_frameIndex % g_numFramesInFlight];
+
+    // Create and grow vertex/index buffers if needed
+    if (fr->VertexBuffer == NULL || fr->VertexBufferSize < draw_data->TotalVtxCount)
+    {
+        if (fr->VertexBuffer)
+        {
+            wgpuBufferDestroy(fr->VertexBuffer);
+            wgpuBufferRelease(fr->VertexBuffer);
+        }
+        SafeRelease(fr->VertexBufferHost);
+        fr->VertexBufferSize = draw_data->TotalVtxCount + 5000;
+
+        WGPUBufferDescriptor vb_desc =
+        {
+            NULL,
+            "Dear ImGui Vertex buffer",
+            WGPUBufferUsage_CopyDst | WGPUBufferUsage_Vertex,
+            fr->VertexBufferSize * sizeof(ImDrawVert),
+            false
+        };
+        fr->VertexBuffer = wgpuDeviceCreateBuffer(g_wgpuDevice, &vb_desc);
+        if (!fr->VertexBuffer)
+            return;
+
+        fr->VertexBufferHost = new ImDrawVert[fr->VertexBufferSize];
+    }
+    if (fr->IndexBuffer == NULL || fr->IndexBufferSize < draw_data->TotalIdxCount)
+    {
+        if (fr->IndexBuffer)
+        {
+            wgpuBufferDestroy(fr->IndexBuffer);
+            wgpuBufferRelease(fr->IndexBuffer);
+        }
+        SafeRelease(fr->IndexBufferHost);
+        fr->IndexBufferSize = draw_data->TotalIdxCount + 10000;
+
+        WGPUBufferDescriptor ib_desc =
+        {
+            NULL,
+            "Dear ImGui Index buffer",
+            WGPUBufferUsage_CopyDst | WGPUBufferUsage_Index,
+            fr->IndexBufferSize * sizeof(ImDrawIdx),
+            false
+        };
+        fr->IndexBuffer = wgpuDeviceCreateBuffer(g_wgpuDevice, &ib_desc);
+        if (!fr->IndexBuffer)
+            return;
+
+        fr->IndexBufferHost = new ImDrawIdx[fr->IndexBufferSize];
+    }
+
+    // Upload vertex/index data into a single contiguous GPU buffer
+    ImDrawVert* vtx_dst = (ImDrawVert*)fr->VertexBufferHost;
+    ImDrawIdx* idx_dst = (ImDrawIdx*)fr->IndexBufferHost;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        memcpy(vtx_dst, cmd_list->VtxBuffer.Data, cmd_list->VtxBuffer.Size * sizeof(ImDrawVert));
+        memcpy(idx_dst, cmd_list->IdxBuffer.Data, cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx));
+        vtx_dst += cmd_list->VtxBuffer.Size;
+        idx_dst += cmd_list->IdxBuffer.Size;
+    }
+    int64_t vb_write_size = ((char*)vtx_dst - (char*)fr->VertexBufferHost + 3) & ~3;
+    int64_t ib_write_size = ((char*)idx_dst - (char*)fr->IndexBufferHost  + 3) & ~3;
+    wgpuQueueWriteBuffer(g_defaultQueue, fr->VertexBuffer, 0, fr->VertexBufferHost, vb_write_size);
+    wgpuQueueWriteBuffer(g_defaultQueue, fr->IndexBuffer,  0, fr->IndexBufferHost,  ib_write_size);
+
+    // Setup desired render state
+    ImGui_ImplWGPU_SetupRenderState(draw_data, pass_encoder, fr);
+
+    // Render command lists
+    // (Because we merged all buffers into a single one, we maintain our own offset into them)
+    int global_vtx_offset = 0;
+    int global_idx_offset = 0;
+    ImVec2 clip_scale = draw_data->FramebufferScale;
+    ImVec2 clip_off = draw_data->DisplayPos;
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback != NULL)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplWGPU_SetupRenderState(draw_data, pass_encoder, fr);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Bind custom texture
+                ImTextureID tex_id = pcmd->GetTexID();
+                ImGuiID tex_id_hash = ImHashData(&tex_id, sizeof(tex_id));
+                auto bind_group = g_resources.ImageBindGroups.GetVoidPtr(tex_id_hash);
+                if (bind_group)
+                {
+                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, (WGPUBindGroup)bind_group, 0, NULL);
+                }
+                else
+                {
+                    WGPUBindGroup image_bind_group = ImGui_ImplWGPU_CreateImageBindGroup(g_resources.ImageBindGroupLayout, (WGPUTextureView)tex_id);
+                    g_resources.ImageBindGroups.SetVoidPtr(tex_id_hash, image_bind_group);
+                    wgpuRenderPassEncoderSetBindGroup(pass_encoder, 1, image_bind_group, 0, NULL);
+                }
+
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y);
+                ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y);
+                if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y)
+                    continue;
+
+                // Apply scissor/clipping rectangle, Draw
+                wgpuRenderPassEncoderSetScissorRect(pass_encoder, (uint32_t)clip_min.x, (uint32_t)clip_min.y, (uint32_t)(clip_max.x - clip_min.x), (uint32_t)(clip_max.y - clip_min.y));
+                wgpuRenderPassEncoderDrawIndexed(pass_encoder, pcmd->ElemCount, 1, pcmd->IdxOffset + global_idx_offset, pcmd->VtxOffset + global_vtx_offset, 0);
+            }
+        }
+        global_idx_offset += cmd_list->IdxBuffer.Size;
+        global_vtx_offset += cmd_list->VtxBuffer.Size;
+    }
+}
+
+static void ImGui_ImplWGPU_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGuiIO& io = ImGui::GetIO();
+    unsigned char* pixels;
+    int width, height, size_pp;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height, &size_pp);
+
+    // Upload texture to graphics system
+    {
+        WGPUTextureDescriptor tex_desc = {};
+        tex_desc.label = "Dear ImGui Font Texture";
+        tex_desc.dimension = WGPUTextureDimension_2D;
+        tex_desc.size.width = width;
+        tex_desc.size.height = height;
+        tex_desc.size.depthOrArrayLayers = 1;
+        tex_desc.sampleCount = 1;
+        tex_desc.format = WGPUTextureFormat_RGBA8Unorm;
+        tex_desc.mipLevelCount = 1;
+        tex_desc.usage = WGPUTextureUsage_CopyDst | WGPUTextureUsage_TextureBinding;
+        g_resources.FontTexture = wgpuDeviceCreateTexture(g_wgpuDevice, &tex_desc);
+
+        WGPUTextureViewDescriptor tex_view_desc = {};
+        tex_view_desc.format = WGPUTextureFormat_RGBA8Unorm;
+        tex_view_desc.dimension = WGPUTextureViewDimension_2D;
+        tex_view_desc.baseMipLevel = 0;
+        tex_view_desc.mipLevelCount = 1;
+        tex_view_desc.baseArrayLayer = 0;
+        tex_view_desc.arrayLayerCount = 1;
+        tex_view_desc.aspect = WGPUTextureAspect_All;
+        g_resources.FontTextureView = wgpuTextureCreateView(g_resources.FontTexture, &tex_view_desc);
+    }
+
+    // Upload texture data
+    {
+        WGPUImageCopyTexture dst_view = {};
+        dst_view.texture = g_resources.FontTexture;
+        dst_view.mipLevel = 0;
+        dst_view.origin = { 0, 0, 0 };
+        dst_view.aspect = WGPUTextureAspect_All;
+        WGPUTextureDataLayout layout = {};
+        layout.offset = 0;
+        layout.bytesPerRow = width * size_pp;
+        layout.rowsPerImage = height;
+        WGPUExtent3D size = { (uint32_t)width, (uint32_t)height, 1 };
+        wgpuQueueWriteTexture(g_defaultQueue, &dst_view, pixels, (uint32_t)(width * size_pp * height), &layout, &size);
+    }
+
+    // Create the associated sampler
+    // (Bilinear sampling is required by default. Set 'io.Fonts->Flags |= ImFontAtlasFlags_NoBakedLines' or 'style.AntiAliasedLinesUseTex = false' to allow point/nearest sampling)
+    {
+        WGPUSamplerDescriptor sampler_desc = {};
+        sampler_desc.minFilter = WGPUFilterMode_Linear;
+        sampler_desc.magFilter = WGPUFilterMode_Linear;
+        sampler_desc.mipmapFilter = WGPUFilterMode_Linear;
+        sampler_desc.addressModeU = WGPUAddressMode_Repeat;
+        sampler_desc.addressModeV = WGPUAddressMode_Repeat;
+        sampler_desc.addressModeW = WGPUAddressMode_Repeat;
+        sampler_desc.maxAnisotropy = 1;
+        g_resources.Sampler = wgpuDeviceCreateSampler(g_wgpuDevice, &sampler_desc);
+    }
+
+    // Store our identifier
+    static_assert(sizeof(ImTextureID) >= sizeof(g_resources.FontTexture), "Can't pack descriptor handle into TexID, 32-bit not supported yet.");
+    io.Fonts->SetTexID((ImTextureID)g_resources.FontTextureView);
+}
+
+static void ImGui_ImplWGPU_CreateUniformBuffer()
+{
+    WGPUBufferDescriptor ub_desc =
+    {
+        NULL,
+        "Dear ImGui Uniform buffer",
+        WGPUBufferUsage_CopyDst | WGPUBufferUsage_Uniform,
+        sizeof(Uniforms),
+        false
+    };
+    g_resources.Uniforms = wgpuDeviceCreateBuffer(g_wgpuDevice, &ub_desc);
+}
+
+bool ImGui_ImplWGPU_CreateDeviceObjects()
+{
+    if (!g_wgpuDevice)
+        return false;
+    if (g_pipelineState)
+        ImGui_ImplWGPU_InvalidateDeviceObjects();
+
+    // Create render pipeline
+    WGPURenderPipelineDescriptor graphics_pipeline_desc = {};
+    graphics_pipeline_desc.primitive.topology = WGPUPrimitiveTopology_TriangleList;
+    graphics_pipeline_desc.primitive.stripIndexFormat = WGPUIndexFormat_Undefined;
+    graphics_pipeline_desc.primitive.frontFace = WGPUFrontFace_CW;
+    graphics_pipeline_desc.primitive.cullMode = WGPUCullMode_None;
+    graphics_pipeline_desc.multisample.count = 1;
+    graphics_pipeline_desc.multisample.mask = UINT_MAX;
+    graphics_pipeline_desc.multisample.alphaToCoverageEnabled = false;
+    graphics_pipeline_desc.layout = nullptr; // Use automatic layout generation
+
+    // Create the vertex shader
+    WGPUProgrammableStageDescriptor vertex_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__glsl_shader_vert_spv, sizeof(__glsl_shader_vert_spv) / sizeof(uint32_t));
+    graphics_pipeline_desc.vertex.module = vertex_shader_desc.module;
+    graphics_pipeline_desc.vertex.entryPoint = vertex_shader_desc.entryPoint;
+
+    // Vertex input configuration
+    WGPUVertexAttribute attribute_desc[] =
+    {
+        { WGPUVertexFormat_Float32x2, (uint64_t)IM_OFFSETOF(ImDrawVert, pos), 0 },
+        { WGPUVertexFormat_Float32x2, (uint64_t)IM_OFFSETOF(ImDrawVert, uv),  1 },
+        { WGPUVertexFormat_Unorm8x4,  (uint64_t)IM_OFFSETOF(ImDrawVert, col), 2 },
+    };
+
+    WGPUVertexBufferLayout buffer_layouts[1];
+    buffer_layouts[0].arrayStride = sizeof(ImDrawVert);
+    buffer_layouts[0].stepMode = WGPUVertexStepMode_Vertex;
+    buffer_layouts[0].attributeCount = 3;
+    buffer_layouts[0].attributes = attribute_desc;
+
+    graphics_pipeline_desc.vertex.bufferCount = 1;
+    graphics_pipeline_desc.vertex.buffers = buffer_layouts;
+
+    // Create the pixel shader
+    WGPUProgrammableStageDescriptor pixel_shader_desc = ImGui_ImplWGPU_CreateShaderModule(__glsl_shader_frag_spv, sizeof(__glsl_shader_frag_spv) / sizeof(uint32_t));
+
+    // Create the blending setup
+    WGPUBlendState blend_state = {};
+    blend_state.alpha.operation = WGPUBlendOperation_Add;
+    blend_state.alpha.srcFactor = WGPUBlendFactor_One;
+    blend_state.alpha.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha;
+    blend_state.color.operation = WGPUBlendOperation_Add;
+    blend_state.color.srcFactor = WGPUBlendFactor_SrcAlpha;
+    blend_state.color.dstFactor = WGPUBlendFactor_OneMinusSrcAlpha;
+
+    WGPUColorTargetState color_state = {};
+    color_state.format = g_renderTargetFormat;
+    color_state.blend = &blend_state;
+    color_state.writeMask = WGPUColorWriteMask_All;
+
+    WGPUFragmentState fragment_state = {};
+    fragment_state.module = pixel_shader_desc.module;
+    fragment_state.entryPoint = pixel_shader_desc.entryPoint;
+    fragment_state.targetCount = 1;
+    fragment_state.targets = &color_state;
+
+    graphics_pipeline_desc.fragment = &fragment_state;
+
+    // Create depth-stencil State
+    WGPUDepthStencilState depth_stencil_state = {};
+    depth_stencil_state.depthBias = 0;
+    depth_stencil_state.depthBiasClamp = 0;
+    depth_stencil_state.depthBiasSlopeScale = 0;
+
+    // Configure disabled depth-stencil state
+    graphics_pipeline_desc.depthStencil = nullptr;
+
+    g_pipelineState = wgpuDeviceCreateRenderPipeline(g_wgpuDevice, &graphics_pipeline_desc);
+
+    ImGui_ImplWGPU_CreateFontsTexture();
+    ImGui_ImplWGPU_CreateUniformBuffer();
+
+    // Create resource bind group
+    WGPUBindGroupLayout bg_layouts[2];
+    bg_layouts[0] = wgpuRenderPipelineGetBindGroupLayout(g_pipelineState, 0);
+    bg_layouts[1] = wgpuRenderPipelineGetBindGroupLayout(g_pipelineState, 1);
+
+    WGPUBindGroupEntry common_bg_entries[] =
+    {
+        { nullptr, 0, g_resources.Uniforms, 0, sizeof(Uniforms), 0, 0 },
+        { nullptr, 1, 0, 0, 0, g_resources.Sampler, 0 },
+    };
+
+    WGPUBindGroupDescriptor common_bg_descriptor = {};
+    common_bg_descriptor.layout = bg_layouts[0];
+    common_bg_descriptor.entryCount = sizeof(common_bg_entries) / sizeof(WGPUBindGroupEntry);
+    common_bg_descriptor.entries = common_bg_entries;
+    g_resources.CommonBindGroup = wgpuDeviceCreateBindGroup(g_wgpuDevice, &common_bg_descriptor);
+
+    WGPUBindGroup image_bind_group = ImGui_ImplWGPU_CreateImageBindGroup(bg_layouts[1], g_resources.FontTextureView);
+    g_resources.ImageBindGroup = image_bind_group;
+    g_resources.ImageBindGroupLayout = bg_layouts[1];
+    g_resources.ImageBindGroups.SetVoidPtr(ImHashData(&g_resources.FontTextureView, sizeof(ImTextureID)), image_bind_group);
+
+    SafeRelease(vertex_shader_desc.module);
+    SafeRelease(pixel_shader_desc.module);
+    SafeRelease(bg_layouts[0]);
+
+    return true;
+}
+
+void ImGui_ImplWGPU_InvalidateDeviceObjects()
+{
+    if (!g_wgpuDevice)
+        return;
+
+    SafeRelease(g_pipelineState);
+    SafeRelease(g_resources);
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.Fonts->SetTexID(NULL); // We copied g_pFontTextureView to io.Fonts->TexID so let's clear that as well.
+
+    for (unsigned int i = 0; i < g_numFramesInFlight; i++)
+        SafeRelease(g_pFrameResources[i]);
+}
+
+bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format)
+{
+    // Setup backend capabilities flags
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendRendererName = "imgui_impl_webgpu";
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+
+    g_wgpuDevice = device;
+    g_defaultQueue = wgpuDeviceGetQueue(g_wgpuDevice);
+    g_renderTargetFormat = rt_format;
+    g_pFrameResources = new FrameResources[num_frames_in_flight];
+    g_numFramesInFlight = num_frames_in_flight;
+    g_frameIndex = UINT_MAX;
+
+    g_resources.FontTexture = NULL;
+    g_resources.FontTextureView = NULL;
+    g_resources.Sampler = NULL;
+    g_resources.Uniforms = NULL;
+    g_resources.CommonBindGroup = NULL;
+    g_resources.ImageBindGroups.Data.reserve(100);
+    g_resources.ImageBindGroup = NULL;
+    g_resources.ImageBindGroupLayout = NULL;
+
+    // Create buffers with a default size (they will later be grown as needed)
+    for (int i = 0; i < num_frames_in_flight; i++)
+    {
+        FrameResources* fr = &g_pFrameResources[i];
+        fr->IndexBuffer = NULL;
+        fr->VertexBuffer = NULL;
+        fr->IndexBufferHost = NULL;
+        fr->VertexBufferHost = NULL;
+        fr->IndexBufferSize = 10000;
+        fr->VertexBufferSize = 5000;
+    }
+
+    return true;
+}
+
+void ImGui_ImplWGPU_Shutdown()
+{
+    ImGui_ImplWGPU_InvalidateDeviceObjects();
+    delete[] g_pFrameResources;
+    g_pFrameResources = NULL;
+    wgpuQueueRelease(g_defaultQueue);
+    g_wgpuDevice = NULL;
+    g_numFramesInFlight = 0;
+    g_frameIndex = UINT_MAX;
+}
+
+void ImGui_ImplWGPU_NewFrame()
+{
+    if (!g_pipelineState)
+        ImGui_ImplWGPU_CreateDeviceObjects();
+}

extern/imgui_patched/backends/imgui_impl_wgpu.h

@@ -0,0 +1,25 @@
+// dear imgui: Renderer for WebGPU
+// This needs to be used along with a Platform Binding (e.g. GLFW)
+// (Please note that WebGPU is currently experimental, will not run on non-beta browsers, and may break.)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'WGPUTextureView' as ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Large meshes support (64k+ vertices) with 16-bit indices.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. 
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"          // IMGUI_IMPL_API
+#include <webgpu/webgpu.h>
+
+IMGUI_IMPL_API bool ImGui_ImplWGPU_Init(WGPUDevice device, int num_frames_in_flight, WGPUTextureFormat rt_format);
+IMGUI_IMPL_API void ImGui_ImplWGPU_Shutdown();
+IMGUI_IMPL_API void ImGui_ImplWGPU_NewFrame();
+IMGUI_IMPL_API void ImGui_ImplWGPU_RenderDrawData(ImDrawData* draw_data, WGPURenderPassEncoder pass_encoder);
+
+// Use if you want to reset your rendering device without losing Dear ImGui state.
+IMGUI_IMPL_API void ImGui_ImplWGPU_InvalidateDeviceObjects();
+IMGUI_IMPL_API bool ImGui_ImplWGPU_CreateDeviceObjects();

extern/imgui_patched/backends/imgui_impl_win32.h

@@ -0,0 +1,45 @@
+// dear imgui: Platform Backend for Windows (standard windows API for 32 and 64 bits applications)
+// This needs to be used along with a Renderer (e.g. DirectX11, OpenGL3, Vulkan..)
+
+// Implemented features:
+//  [X] Platform: Clipboard support (for Win32 this is actually part of core dear imgui)
+//  [X] Platform: Keyboard support. Since 1.87 we are using the io.AddKeyEvent() function. Pass ImGuiKey values to all key functions e.g. ImGui::IsKeyPressed(ImGuiKey_Space). [Legacy VK_* values will also be supported unless IMGUI_DISABLE_OBSOLETE_KEYIO is set]
+//  [X] Platform: Gamepad support. Enabled with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'.
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+IMGUI_IMPL_API bool     ImGui_ImplWin32_Init(void* hwnd);
+IMGUI_IMPL_API void     ImGui_ImplWin32_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplWin32_NewFrame();
+
+// Win32 message handler your application need to call.
+// - Intentionally commented out in a '#if 0' block to avoid dragging dependencies on <windows.h> from this helper.
+// - You should COPY the line below into your .cpp code to forward declare the function and then you can call it.
+// - Call from your application's message handler. Keep calling your message handler unless this function returns TRUE.
+
+#if 0
+extern IMGUI_IMPL_API LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
+#endif
+
+// DPI-related helpers (optional)
+// - Use to enable DPI awareness without having to create an application manifest.
+// - Your own app may already do this via a manifest or explicit calls. This is mostly useful for our examples/ apps.
+// - In theory we could call simple functions from Windows SDK such as SetProcessDPIAware(), SetProcessDpiAwareness(), etc.
+//   but most of the functions provided by Microsoft require Windows 8.1/10+ SDK at compile time and Windows 8/10+ at runtime,
+//   neither we want to require the user to have. So we dynamically select and load those functions to avoid dependencies.
+IMGUI_IMPL_API void     ImGui_ImplWin32_EnableDpiAwareness();
+IMGUI_IMPL_API float    ImGui_ImplWin32_GetDpiScaleForHwnd(void* hwnd);       // HWND hwnd
+IMGUI_IMPL_API float    ImGui_ImplWin32_GetDpiScaleForMonitor(void* monitor); // HMONITOR monitor
+
+// Transparency related helpers (optional) [experimental]
+// - Use to enable alpha compositing transparency with the desktop.
+// - Use together with e.g. clearing your framebuffer with zero-alpha.
+IMGUI_IMPL_API void     ImGui_ImplWin32_EnableAlphaCompositing(void* hwnd);   // HWND hwnd

extern/imgui_patched/backends/vulkan/generate_spv.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+## -V: create SPIR-V binary
+## -x: save binary output as text-based 32-bit hexadecimal numbers
+## -o: output file
+glslangValidator -V -x -o glsl_shader.frag.u32 glsl_shader.frag
+glslangValidator -V -x -o glsl_shader.vert.u32 glsl_shader.vert

extern/imgui_patched/backends/vulkan/glsl_shader.frag

@@ -0,0 +1,14 @@
+#version 450 core
+layout(location = 0) out vec4 fColor;
+
+layout(set=0, binding=0) uniform sampler2D sTexture;
+
+layout(location = 0) in struct {
+    vec4 Color;
+    vec2 UV;
+} In;
+
+void main()
+{
+    fColor = In.Color * texture(sTexture, In.UV.st);
+}

extern/imgui_patched/backends/vulkan/glsl_shader.vert

@@ -0,0 +1,25 @@
+#version 450 core
+layout(location = 0) in vec2 aPos;
+layout(location = 1) in vec2 aUV;
+layout(location = 2) in vec4 aColor;
+
+layout(push_constant) uniform uPushConstant {
+    vec2 uScale;
+    vec2 uTranslate;
+} pc;
+
+out gl_PerVertex {
+    vec4 gl_Position;
+};
+
+layout(location = 0) out struct {
+    vec4 Color;
+    vec2 UV;
+} Out;
+
+void main()
+{
+    Out.Color = aColor;
+    Out.UV = aUV;
+    gl_Position = vec4(aPos * pc.uScale + pc.uTranslate, 0, 1);
+}

extern/imgui_patched/docs/BACKENDS.md

@@ -0,0 +1,144 @@
+_(You may browse this at https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md or view this file with any Markdown viewer)_
+
+## Dear ImGui: Backends
+
+**The backends/ folder contains backends for popular platforms/graphics API, which you can use in
+your application or engine to easily integrate Dear ImGui.** Each backend is typically self-contained in a pair of files: imgui_impl_XXXX.cpp + imgui_impl_XXXX.h.
+
+- The 'Platform' backends are in charge of: mouse/keyboard/gamepad inputs, cursor shape, timing, windowing.<BR>
+  e.g. Windows ([imgui_impl_win32.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_win32.cpp)), GLFW ([imgui_impl_glfw.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_glfw.cpp)), SDL2 ([imgui_impl_sdl.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_sdl.cpp)), etc.
+
+- The 'Renderer' backends are in charge of: creating atlas texture, rendering imgui draw data.<BR>
+  e.g. DirectX11 ([imgui_impl_dx11.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_dx11.cpp)), OpenGL/WebGL ([imgui_impl_opengl3.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_opengl3.cpp)), Vulkan ([imgui_impl_vulkan.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_vulkan.cpp)), etc.
+
+- For some high-level frameworks, a single backend usually handle both 'Platform' and 'Renderer' parts.<BR>
+  e.g. Allegro 5 ([imgui_impl_allegro5.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_allegro5.cpp)). If you end up creating a custom backend for your engine, you may want to do the same.
+
+An application usually combines 1 Platform backend + 1 Renderer backend + main Dear ImGui sources.
+For example, the [example_win32_directx11](https://github.com/ocornut/imgui/tree/master/examples/example_win32_directx11) application combines imgui_impl_win32.cpp + imgui_impl_dx11.cpp. There are 20+ examples in the [examples/](https://github.com/ocornut/imgui/blob/master/examples/) folder. See [EXAMPLES.MD](https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md) for details.
+
+**Once Dear ImGui is setup and running, run and refer to `ImGui::ShowDemoWindow()` in imgui_demo.cpp for usage of the end-user API.**
+
+
+### What are backends
+
+Dear ImGui is highly portable and only requires a few things to run and render, typically:
+
+ - Required: providing mouse/keyboard inputs (fed into the `ImGuiIO` structure).
+ - Required: uploading the font atlas texture into graphics memory.
+ - Required: rendering indexed textured triangles with a clipping rectangle.
+
+ Extra features are opt-in, our backends try to support as many as possible:
+
+ - Optional: custom texture binding support.
+ - Optional: clipboard support.
+ - Optional: gamepad support.
+ - Optional: mouse cursor shape support.
+ - Optional: IME support.
+ - Optional: multi-viewports support.
+ etc.
+
+This is essentially what each backend is doing + obligatory portability cruft. Using default backends ensure you can get all those features including the ones that would be harder to implement on your side (e.g. multi-viewports support).
+
+It is important to understand the difference between the core Dear ImGui library (files in the root folder)
+and backends which we are describing here (backends/ folder).
+
+- Some issues may only be backend or platform specific.
+- You should be able to write backends for pretty much any platform and any 3D graphics API.
+  e.g. you can get creative and use software rendering or render remotely on a different machine.
+
+
+### Integrating a backend
+
+See "Getting Started" section of [EXAMPLES.MD](https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md) for more details.
+
+
+### List of backends
+
+In the [backends/](https://github.com/ocornut/imgui/blob/master/backends) folder:
+
+List of Platforms Backends:
+
+    imgui_impl_android.cpp    ; Android native app API
+    imgui_impl_glfw.cpp       ; GLFW (Windows, macOS, Linux, etc.) http://www.glfw.org/
+    imgui_impl_osx.mm         ; macOS native API (not as feature complete as glfw/sdl backends)
+    imgui_impl_sdl.cpp        ; SDL2 (Windows, macOS, Linux, iOS, Android) https://www.libsdl.org
+    imgui_impl_win32.cpp      ; Win32 native API (Windows)
+    imgui_impl_glut.cpp       ; GLUT/FreeGLUT (this is prehistoric software and absolutely not recommended today!)
+
+List of Renderer Backends:
+
+    imgui_impl_dx9.cpp        ; DirectX9
+    imgui_impl_dx10.cpp       ; DirectX10
+    imgui_impl_dx11.cpp       ; DirectX11
+    imgui_impl_dx12.cpp       ; DirectX12
+    imgui_impl_metal.mm       ; Metal (with ObjC)
+    imgui_impl_opengl2.cpp    ; OpenGL 2 (legacy, fixed pipeline <- don't use with modern OpenGL context)
+    imgui_impl_opengl3.cpp    ; OpenGL 3/4, OpenGL ES 2, OpenGL ES 3 (modern programmable pipeline)
+    imgui_impl_sdlrenderer.cpp; SDL_Renderer (optional component of SDL2 available from SDL 2.0.18+)
+    imgui_impl_vulkan.cpp     ; Vulkan
+    imgui_impl_wgpu.cpp       ; WebGPU
+
+List of high-level Frameworks Backends (combining Platform + Renderer):
+
+    imgui_impl_allegro5.cpp
+
+Emscripten is also supported.
+The [example_emscripten_opengl3](https://github.com/ocornut/imgui/tree/master/examples/example_emscripten_opengl3) app uses imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp, but other combos are possible.
+
+### Backends for third-party frameworks, graphics API or other languages
+
+See https://github.com/ocornut/imgui/wiki/Bindings for the full list (e.g. Adventure Game Studio, Cinder, Cocos2d-x, Game Maker Studio2, Godot, LÖVE+LUA, Magnum, Monogame, Ogre, openFrameworks, OpenSceneGraph, SFML, Sokol, Unity, Unreal Engine and many others).
+
+### Recommended Backends
+
+If you are not sure which backend to use, the recommended platform/frameworks for portable applications:
+
+|Library |Website |Backend |Note |
+|--------|--------|--------|-----|
+| GLFW | https://github.com/glfw/glfw | imgui_impl_glfw.cpp | |
+| SDL2 | https://www.libsdl.org | imgui_impl_sdl.cpp | |
+| Sokol | https://github.com/floooh/sokol | [util/sokol_imgui.h](https://github.com/floooh/sokol/blob/master/util/sokol_imgui.h) | Lower-level than GLFW/SDL |
+
+
+### Using a custom engine?
+
+You will likely be tempted to start by rewrite your own backend using your own custom/high-level facilities...<BR>
+Think twice!
+
+If you are new to Dear ImGui, first try using the existing backends as-is.
+You will save lots of time integrating the library.
+You can LATER decide to rewrite yourself a custom backend if you really need to.
+In most situations, custom backends have less features and more bugs than the standard backends we provide.
+If you want portability, you can use multiple backends and choose between them either at compile time
+or at runtime.
+
+**Example A**: your engine is built over Windows + DirectX11 but you have your own high-level rendering
+system layered over DirectX11.<BR>
+Suggestion: try using imgui_impl_win32.cpp + imgui_impl_dx11.cpp first.
+Once it works, if you really need it you can replace the imgui_impl_dx11.cpp code with a
+custom renderer using your own rendering functions, and keep using the standard Win32 code etc.
+
+**Example B**: your engine runs on Windows, Mac, Linux and uses DirectX11, Metal, Vulkan respectively.<BR>
+Suggestion: use multiple generic backends!
+Once it works, if you really need it you can replace parts of backends with your own abstractions.
+
+**Example C**: your engine runs on platforms we can't provide public backends for (e.g. PS4/PS5, Switch),
+and you have high-level systems everywhere.<BR>
+Suggestion: try using a non-portable backend first (e.g. win32 + underlying graphics API) to get
+your desktop builds working first. This will get you running faster and get your acquainted with
+how Dear ImGui works and is setup. You can then rewrite a custom backend using your own engine API...
+
+Generally:
+It is unlikely you will add value to your project by creating your own backend.
+
+Also:
+The [multi-viewports feature](https://github.com/ocornut/imgui/issues/1542) of the 'docking' branch allows
+Dear ImGui windows to be seamlessly detached from the main application window. This is achieved using an
+extra layer to the Platform and Renderer backends, which allows Dear ImGui to communicate platform-specific
+requests such as: "create an additional OS window", "create a render context", "get the OS position of this
+window" etc. See 'ImGuiPlatformIO' for details.
+Supporting the multi-viewports feature correctly using 100% of your own abstractions is more difficult
+than supporting single-viewport.
+If you decide to use unmodified imgui_impl_XXXX.cpp files, you can automatically benefit from
+improvements and fixes related to viewports and platform windows without extra work on your side.

extern/imgui_patched/docs/EXAMPLES.md

@@ -0,0 +1,242 @@
+_(You may browse this at https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md or view this file with any Markdown viewer)_
+
+## Dear ImGui: Examples
+
+**The [examples/](https://github.com/ocornut/imgui/blob/master/examples) folder example applications (standalone, ready-to-build) for variety of
+platforms and graphics APIs.** They all use standard backends from the [backends/](https://github.com/ocornut/imgui/blob/master/backends) folder (see [BACKENDS.md](https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md)).
+
+The purpose of Examples is to showcase integration with backends, let you try Dear ImGui, and guide you toward
+integrating Dear ImGui in your own application/game/engine.
+**Once Dear ImGui is setup and running, run and refer to `ImGui::ShowDemoWindow()` in imgui_demo.cpp for usage of the end-user API.**
+
+You can find Windows binaries for some of those example applications at:
+  http://www.dearimgui.org/binaries
+
+
+### Getting Started
+
+Integration in a typical existing application, should take <20 lines when using standard backends.
+
+    At initialization:
+      call ImGui::CreateContext()
+      call ImGui_ImplXXXX_Init() for each backend.
+
+    At the beginning of your frame:
+      call ImGui_ImplXXXX_NewFrame() for each backend.
+      call ImGui::NewFrame()
+
+    At the end of your frame:
+      call ImGui::Render()
+      call ImGui_ImplXXXX_RenderDrawData() for your Renderer backend.
+
+    At shutdown:
+      call ImGui_ImplXXXX_Shutdown() for each backend.
+      call ImGui::DestroyContext()
+
+Example (using [backends/imgui_impl_win32.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_win32.cpp) + [backends/imgui_impl_dx11.cpp](https://github.com/ocornut/imgui/blob/master/backends/imgui_impl_dx11.cpp)):
+
+    // Create a Dear ImGui context, setup some options
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO();
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable some options
+
+    // Initialize Platform + Renderer backends (here: using imgui_impl_win32.cpp + imgui_impl_dx11.cpp)
+    ImGui_ImplWin32_Init(my_hwnd);
+    ImGui_ImplDX11_Init(my_d3d_device, my_d3d_device_context);
+
+    // Application main loop
+    while (true)
+    {
+        // Beginning of frame: update Renderer + Platform backend, start Dear ImGui frame
+        ImGui_ImplDX11_NewFrame();
+        ImGui_ImplWin32_NewFrame();
+        ImGui::NewFrame();
+
+        // Any application code here
+        ImGui::Text("Hello, world!");
+
+        // End of frame: render Dear ImGui
+        ImGui::Render();
+        ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
+
+        // Swap
+        g_pSwapChain->Present(1, 0);
+    }
+
+    // Shutdown
+    ImGui_ImplDX11_Shutdown();
+    ImGui_ImplWin32_Shutdown();
+    ImGui::DestroyContext();
+
+Please read 'PROGRAMMER GUIDE' in imgui.cpp for notes on how to setup Dear ImGui in your codebase.
+Please read the comments and instruction at the top of each file.
+Please read FAQ at http://www.dearimgui.org/faq
+
+If you are using any of the backends provided here, you can add the backends/imgui_impl_xxxx(.cpp,.h)
+files to your project and use as-in. Each imgui_impl_xxxx.cpp file comes with its own individual
+Changelog, so if you want to update them later it will be easier to catch up with what changed.
+
+
+### Examples Applications
+
+[example_allegro5/](https://github.com/ocornut/imgui/blob/master/examples/example_allegro5/) <BR>
+Allegro 5 example. <BR>
+= main.cpp + imgui_impl_allegro5.cpp
+
+[example_android_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_android_opengl3/) <BR>
+Android + OpenGL3 (ES) example. <BR>
+= main.cpp + imgui_impl_android.cpp + imgui_impl_opengl3.cpp
+
+[example_apple_metal/](https://github.com/ocornut/imgui/blob/master/examples/example_metal/) <BR>
+OSX & iOS + Metal example. <BR>
+= main.m + imgui_impl_osx.mm + imgui_impl_metal.mm <BR>
+It is based on the "cross-platform" game template provided with Xcode as of Xcode 9.
+(NB: imgui_impl_osx.mm is currently not as feature complete as other platforms backends.
+You may prefer to use the GLFW Or SDL backends, which will also support Windows and Linux.)
+
+[example_apple_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_apple_opengl2/) <BR>
+OSX + OpenGL2 example. <BR>
+= main.mm + imgui_impl_osx.mm + imgui_impl_opengl2.cpp <BR>
+(NB: imgui_impl_osx.mm is currently not as feature complete as other platforms backends.
+ You may prefer to use the GLFW Or SDL backends, which will also support Windows and Linux.)
+
+[example_emscripten_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_emscripten_opengl3/) <BR>
+Emcripten + SDL2 + OpenGL3+/ES2/ES3 example. <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp <BR>
+Note that other examples based on SDL or GLFW + OpenGL could easily be modified to work with Emscripten.
+We provide this to make the Emscripten differences obvious, and have them not pollute all other examples.
+
+[example_emscripten_wgpu/](https://github.com/ocornut/imgui/blob/master/examples/example_emscripten_wgpu/) <BR>
+Emcripten + GLFW + WebGPU example. <BR>
+= main.cpp + imgui_impl_glfw.cpp + imgui_impl_wgpu.cpp
+
+[example_glfw_metal/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_metal/) <BR>
+GLFW (Mac) + Metal example. <BR>
+= main.mm + imgui_impl_glfw.cpp + imgui_impl_metal.mm
+
+[example_glfw_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl2/) <BR>
+GLFW + OpenGL2 example (legacy, fixed pipeline). <BR>
+= main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl2.cpp <BR>
+**DO NOT USE THIS IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR>
+This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter.
+If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to
+make things more complicated, will require your code to reset many OpenGL attributes to their initial
+state, and might confuse your GPU driver. One star, not recommended.
+
+[example_glfw_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_opengl3/) <BR>
+GLFW (Win32, Mac, Linux) + OpenGL3+/ES2/ES3 example (modern, programmable pipeline). <BR>
+= main.cpp + imgui_impl_glfw.cpp + imgui_impl_opengl3.cpp <BR>
+This uses more modern OpenGL calls and custom shaders. <BR>
+This may actually also work with OpenGL 2.x contexts! <BR>
+Prefer using that if you are using modern OpenGL in your application (anything with shaders).
+
+[example_glfw_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_glfw_vulkan/) <BR>
+GLFW (Win32, Mac, Linux) + Vulkan example. <BR>
+= main.cpp + imgui_impl_glfw.cpp + imgui_impl_vulkan.cpp <BR>
+This is quite long and tedious, because: Vulkan.
+For this example, the main.cpp file exceptionally use helpers function from imgui_impl_vulkan.h/cpp.
+
+[example_glut_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_glut_opengl2/) <BR>
+GLUT (e.g., FreeGLUT on Linux/Windows, GLUT framework on OSX) + OpenGL2 example. <BR>
+= main.cpp + imgui_impl_glut.cpp + imgui_impl_opengl2.cpp <BR>
+Note that GLUT/FreeGLUT is largely obsolete software, prefer using GLFW or SDL.
+
+[example_null/](https://github.com/ocornut/imgui/blob/master/examples/example_null/) <BR>
+Null example, compile and link imgui, create context, run headless with no inputs and no graphics output. <BR>
+= main.cpp <BR>
+This is used to quickly test compilation of core imgui files in as many setups as possible.
+Because this application doesn't create a window nor a graphic context, there's no graphics output.
+
+[example_sdl_directx11/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_directx11/) <BR>
+SDL2 + DirectX11 example, Windows only. <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_dx11.cpp <BR>
+This to demonstrate usage of DirectX with SDL.
+
+[example_sdl_metal/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_metal/) <BR>
+SDL2 (Mac) + Metal example. <BR>
+= main.mm + imgui_impl_sdl.cpp + imgui_impl_metal.mm
+
+[example_sdl_opengl2/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_opengl2/) <BR>
+SDL2 (Win32, Mac, Linux etc.) + OpenGL example (legacy, fixed pipeline). <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl2.cpp <BR>
+**DO NOT USE OPENGL2 CODE IF YOUR CODE/ENGINE IS USING MODERN OPENGL (SHADERS, VBO, VAO, etc.)** <BR>
+This code is mostly provided as a reference to learn about Dear ImGui integration, because it is shorter.
+If your code is using GL3+ context or any semi modern OpenGL calls, using this renderer is likely to
+make things more complicated, will require your code to reset many OpenGL attributes to their initial
+state, and might confuse your GPU driver. One star, not recommended.
+
+[example_sdl_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_opengl3/) <BR>
+SDL2 (Win32, Mac, Linux, etc.) + OpenGL3+/ES2/ES3 example. <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_opengl3.cpp <BR>
+This uses more modern OpenGL calls and custom shaders. <BR>
+This may actually also work with OpenGL 2.x contexts! <BR>
+
+[example_sdl_sdlrenderer/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_sdlrenderer/) <BR>
+SDL2 (Win32, Mac, Linux, etc.) + SDL_Renderer (most graphics backends are supported underneath) <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_sdlrenderer.cpp <BR>
+This requires SDL 2.0.17+ (expected to release November 2021) <BR>
+We do not really recommend using SDL_Renderer as it is a rather primitive API.
+
+[example_sdl_vulkan/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl_vulkan/) <BR>
+SDL2 (Win32, Mac, Linux, etc.) + Vulkan example. <BR>
+= main.cpp + imgui_impl_sdl.cpp + imgui_impl_vulkan.cpp <BR>
+This is quite long and tedious, because: Vulkan. <BR>
+For this example, the main.cpp file exceptionally use helpers function from imgui_impl_vulkan.h/cpp.
+
+[example_win32_directx9/](https://github.com/ocornut/imgui/blob/master/examples/example_win32_directx9/) <BR>
+DirectX9 example, Windows only. <BR>
+= main.cpp + imgui_impl_win32.cpp + imgui_impl_dx9.cpp
+
+[example_win32_directx10/](https://github.com/ocornut/imgui/blob/master/examples/example_win32_directx10/) <BR>
+DirectX10 example, Windows only. <BR>
+= main.cpp + imgui_impl_win32.cpp + imgui_impl_dx10.cpp
+
+[example_win32_directx11/](https://github.com/ocornut/imgui/blob/master/examples/example_win32_directx11/) <BR>
+DirectX11 example, Windows only. <BR>
+= main.cpp + imgui_impl_win32.cpp + imgui_impl_dx11.cpp
+
+[example_win32_directx12/](https://github.com/ocornut/imgui/blob/master/examples/example_win32_directx12/) <BR>
+DirectX12 example, Windows only. <BR>
+= main.cpp + imgui_impl_win32.cpp + imgui_impl_dx12.cpp <BR>
+This is quite long and tedious, because: DirectX12.
+
+
+### Miscallaneous
+
+**Building**
+
+Unfortunately nowadays it is still tedious to create and maintain portable build files using external
+libraries (the kind we're using here to create a window and render 3D triangles) without relying on
+third party software and build systems. For most examples here we choose to provide:
+ - Makefiles for Linux/OSX
+ - Batch files for Visual Studio 2008+
+ - A .sln project file for Visual Studio 2012+
+ - Xcode project files for the Apple examples
+Please let us know if they don't work with your setup!
+You can probably just import the imgui_impl_xxx.cpp/.h files into your own codebase or compile those
+directly with a command-line compiler.
+
+If you are interested in using Cmake to build and links examples, see:
+  https://github.com/ocornut/imgui/pull/1713 and https://github.com/ocornut/imgui/pull/3027
+
+**About mouse cursor latency**
+
+Dear ImGui has no particular extra lag for most behaviors,
+e.g. the last value passed to 'io.AddMousePosEvent()' before NewFrame() will result in windows being moved
+to the right spot at the time of EndFrame()/Render(). At 60 FPS your experience should be pleasant.
+
+However, consider that OS mouse cursors are typically drawn through a very specific hardware accelerated
+path and will feel smoother than the majority of contents rendered via regular graphics API (including,
+but not limited to Dear ImGui windows). Because UI rendering and interaction happens on the same plane
+as the mouse, that disconnect may be jarring to particularly sensitive users.
+You may experiment with enabling the io.MouseDrawCursor flag to request Dear ImGui to draw a mouse cursor
+using the regular graphics API, to help you visualize the difference between a "hardware" cursor and a
+regularly rendered software cursor.
+However, rendering a mouse cursor at 60 FPS will feel sluggish so you likely won't want to enable that at
+all times. It might be beneficial for the user experience to switch to a software rendered cursor _only_
+when an interactive drag is in progress.
+
+Note that some setup or GPU drivers are likely to be causing extra display lag depending on their settings.
+If you feel that dragging windows feels laggy and you are not sure what the cause is: try to build a simple
+drawing a flat 2D shape directly under the mouse cursor!
+

extern/imgui_patched/docs/FAQ.md

@@ -0,0 +1,676 @@
+# FAQ (Frequenty Asked Questions)
+
+You may link to this document using short form:
+  https://www.dearimgui.org/faq
+or its real address:
+  https://github.com/ocornut/imgui/blob/master/docs/FAQ.md
+or view this file with any Markdown viewer.
+
+
+## Index
+
+| **Q&A: Basics** |
+:---------------------------------------------------------- |
+| [Where is the documentation?](#q-where-is-the-documentation) |
+| [What is this library called?](#q-what-is-this-library-called) |
+| [Which version should I get?](#q-which-version-should-i-get) |
+| **Q&A: Integration** |
+| **[How to get started?](#q-how-to-get-started)** |
+| **[How can I tell whether to dispatch mouse/keyboard to Dear ImGui or my application?](#q-how-can-i-tell-whether-to-dispatch-mousekeyboard-to-dear-imgui-or-my-application)** |
+| [How can I enable keyboard or gamepad controls?](#q-how-can-i-enable-keyboard-or-gamepad-controls) |
+| [How can I use this on a machine without mouse, keyboard or screen? (input share, remote display)](#q-how-can-i-use-this-on-a-machine-without-mouse-keyboard-or-screen-input-share-remote-display) |
+| [I integrated Dear ImGui in my engine and little squares are showing instead of text...](#q-i-integrated-dear-imgui-in-my-engine-and-little-squares-are-showing-instead-of-text) |
+| [I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-clipping-or-disappearing-when-i-move-windows-around) |
+| [I integrated Dear ImGui in my engine and some elements are displaying outside their expected windows boundaries...](#q-i-integrated-dear-imgui-in-my-engine-and-some-elements-are-displaying-outside-their-expected-windows-boundaries) |
+| **Q&A: Usage** |
+| **[About the ID Stack system..<br>Why is my widget not reacting when I click on it?<br>How can I have widgets with an empty label?<br>How can I have multiple widgets with the same label?<br>How can I have multiple windows with the same label?](#q-about-the-id-stack-system)** |
+| [How can I display an image? What is ImTextureID, how does it work?](#q-how-can-i-display-an-image-what-is-imtextureid-how-does-it-work)|
+| [How can I use my own math types instead of ImVec2/ImVec4?](#q-how-can-i-use-my-own-math-types-instead-of-imvec2imvec4) |
+| [How can I interact with standard C++ types (such as std::string and std::vector)?](#q-how-can-i-interact-with-standard-c-types-such-as-stdstring-and-stdvector) |
+| [How can I display custom shapes? (using low-level ImDrawList API)](#q-how-can-i-display-custom-shapes-using-low-level-imdrawlist-api) |
+| **Q&A: Fonts, Text** |
+| [How should I handle DPI in my application?](#q-how-should-i-handle-dpi-in-my-application) |
+| [How can I load a different font than the default?](#q-how-can-i-load-a-different-font-than-the-default) |
+| [How can I easily use icons in my application?](#q-how-can-i-easily-use-icons-in-my-application) |
+| [How can I load multiple fonts?](#q-how-can-i-load-multiple-fonts) |
+| [How can I display and input non-Latin characters such as Chinese, Japanese, Korean, Cyrillic?](#q-how-can-i-display-and-input-non-latin-characters-such-as-chinese-japanese-korean-cyrillic) |
+| **Q&A: Concerns** |
+| [Who uses Dear ImGui?](#q-who-uses-dear-imgui) |
+| [Can you create elaborate/serious tools with Dear ImGui?](#q-can-you-create-elaborateserious-tools-with-dear-imgui)  |
+| [Can you reskin the look of Dear ImGui?](#q-can-you-reskin-the-look-of-dear-imgui) |
+| [Why using C++ (as opposed to C)?](#q-why-using-c-as-opposed-to-c) |
+| **Q&A: Community** |
+| [How can I help?](#q-how-can-i-help) |
+
+
+# Q&A: Basics
+
+### Q: Where is the documentation?
+
+**This library is poorly documented at the moment and expects the user to be acquainted with C/C++.**
+- The [Wiki](https://github.com/ocornut/imgui/wiki) is a hub to many resources and links.
+- Dozens of standalone example applications using e.g. OpenGL/DirectX are provided in the [examples/](https://github.com/ocornut/imgui/blob/master/examples/) folder to explain how to integrate Dear ImGui with your own engine/application. You can run those applications and explore them.
+- See demo code in [imgui_demo.cpp](https://github.com/ocornut/imgui/blob/master/imgui_demo.cpp) and particularly the `ImGui::ShowDemoWindow()` function. The demo covers most features of Dear ImGui, so you can read the code and see its output.
+- See documentation: [Backends](https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md), [Examples](https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md), [Fonts](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md).
+- See documentation and comments at the top of [imgui.cpp](https://github.com/ocornut/imgui/blob/master/imgui.cpp) + general API comments in [imgui.h](https://github.com/ocornut/imgui/blob/master/imgui.h).
+- The [Glossary](https://github.com/ocornut/imgui/wiki/Glossary) page may be useful.
+- The [Issues](https://github.com/ocornut/imgui/issues) and [Discussions](https://github.com/ocornut/imgui/discussions) sections can be searched for past questions and issues.
+- Your programming IDE is your friend, find the type or function declaration to find comments associated with it.
+- The `ImGui::ShowMetricsWindow()` function exposes lots of internal information and tools. Although it is primary designed as a debugging tool, having access to that information tends to help understands concepts.
+
+##### [Return to Index](#index)
+
+---
+
+### Q. What is this library called?
+
+**This library is called Dear ImGui**. Please refer to it as Dear ImGui (not ImGui, not IMGUI).
+
+(The library misleadingly started its life in 2014 as "ImGui" due to the fact that I didn't give it a proper name when I released 1.0, and had no particular expectation that it would take off. However, the term IMGUI (immediate-mode graphical user interface) was coined before and is being used in variety of other situations e.g. Unity uses it own implementation of the IMGUI paradigm. To reduce the ambiguity without affecting existing code bases, I have decided in December 2015 a fully qualified name "Dear ImGui" for this library.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: Which version should I get?
+I occasionally tag [Releases](https://github.com/ocornut/imgui/releases) but it is generally safe and recommended to sync to master/latest. The library is fairly stable and regressions tend to be fixed fast when reported.
+
+You may use the [docking](https://github.com/ocornut/imgui/tree/docking) branch which includes:
+- [Docking features](https://github.com/ocornut/imgui/issues/2109)
+- [Multi-viewport features](https://github.com/ocornut/imgui/issues/1542)
+
+Many projects are using this branch and it is kept in sync with master regularly.
+
+##### [Return to Index](#index)
+
+----
+
+# Q&A: Integration
+
+### Q: How to get started?
+
+Read [EXAMPLES.md](https://github.com/ocornut/imgui/blob/master/docs/EXAMPLES.md). <BR>
+Read [BACKENDS.md](https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md). <BR>
+Read `PROGRAMMER GUIDE` section of [imgui.cpp](https://github.com/ocornut/imgui/blob/master/imgui.cpp). <BR>
+The [Wiki](https://github.com/ocornut/imgui/wiki) is a hub to many resources and links.
+
+For first-time users having issues compiling/linking/running or issues loading fonts, please use [GitHub Discussions](https://github.com/ocornut/imgui/discussions).
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I tell whether to dispatch mouse/keyboard to Dear ImGui or my application?
+
+You can read the `io.WantCaptureMouse`, `io.WantCaptureKeyboard` and `io.WantTextInput` flags from the ImGuiIO structure.
+- When `io.WantCaptureMouse` is set, you need to discard/hide the mouse inputs from your underlying application.
+- When `io.WantCaptureKeyboard` is set, you need to discard/hide the keyboard inputs from your underlying application.
+- When `io.WantTextInput` is set, you can notify your OS/engine to popup an on-screen keyboard, if available (e.g. on a mobile phone, or console OS).
+
+Important: you should always pass your mouse/keyboard inputs to Dear ImGui, regardless of the value `io.WantCaptureMouse`/`io.WantCaptureKeyboard`. This is because e.g. we need to detect that you clicked in the void to unfocus its own windows, and other reasons.
+
+```cpp
+void MyLowLevelMouseButtonHandler(int button, bool down)
+{
+    // (1) ALWAYS forward mouse data to ImGui! This is automatic with default backends. With your own backend:
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddMouseButtonEvent(button, down);
+
+    // (2) ONLY forward mouse data to your underlying app/game.
+    if (!io.WantCaptureMouse)
+        my_game->HandleMouseData(...);
+}
+```
+
+
+**Note:** The `io.WantCaptureMouse` is more correct that any manual attempt to "check if the mouse is hovering a window" (don't do that!). It handle mouse dragging correctly (both dragging that started over your application or over a Dear ImGui window) and handle e.g. popup and modal windows blocking inputs.
+
+**Note:** Those flags are updated by `ImGui::NewFrame()`. However it is generally more correct and easier that you poll flags from the previous frame, then submit your inputs, then call `NewFrame()`. If you attempt to do the opposite (which is generally harder) you are likely going to submit your inputs after `NewFrame()`, and therefore too late.
+
+**Note:** If you are using a touch device, you may find use for an early call to `UpdateHoveredWindowAndCaptureFlags()` to correctly dispatch your initial touch. We will work on better out-of-the-box touch support in the future.
+
+**Note:** Text input widget releases focus on the "KeyDown" event of the Return key, so the subsequent "KeyUp" event that your application receive will typically have `io.WantCaptureKeyboard == false`. Depending on your application logic it may or not be inconvenient to receive that KeyUp event. You might want to track which key-downs were targeted for Dear ImGui, e.g. with an array of bool, and filter out the corresponding key-ups.)
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I enable keyboard or gamepad controls?
+- The gamepad/keyboard navigation is fairly functional and keeps being improved. The initial focus was to support game controllers, but keyboard is becoming increasingly and decently usable. Gamepad support is particularly useful to use Dear ImGui on a game console (e.g. PS4, Switch, XB1) without a mouse connected!
+- Keyboard: set `io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard` to enable.
+- Gamepad: set `io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad` to enable (with a supporting backend).
+- See [Control Sheets for Gamepads](http://www.dearimgui.org/controls_sheets) (reference PNG/PSD for PS4, XB1, Switch gamepads).
+- See `USING GAMEPAD/KEYBOARD NAVIGATION CONTROLS` section of [imgui.cpp](https://github.com/ocornut/imgui/blob/master/imgui.cpp) for more details.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I use this on a machine without mouse, keyboard or screen? (input share, remote display)
+- You can share your computer mouse seamlessly with your console/tablet/phone using solutions such as [Synergy](https://symless.com/synergy)
+This is the preferred solution for developer productivity.
+In particular, the [micro-synergy-client repository](https://github.com/symless/micro-synergy-client) has simple
+and portable source code (uSynergy.c/.h) for a small embeddable client that you can use on any platform to connect
+to your host computer, based on the Synergy 1.x protocol. Make sure you download the Synergy 1 server on your computer.
+Console SDK also sometimes provide equivalent tooling or wrapper for Synergy-like protocols.
+- Game console users: consider emulating a mouse cursor with DualShock4 touch pad or a spare analog stick as a mouse-emulation fallback.
+- You may also use a third party solution such as [netImgui](https://github.com/sammyfreg/netImgui), [Remote ImGui](https://github.com/JordiRos/remoteimgui) or [imgui-ws](https://github.com/ggerganov/imgui-ws) which sends the vertices to render over the local network, allowing you to use Dear ImGui even on a screen-less machine. See [Wiki](https://github.com/ocornut/imgui/wiki) index for most details.
+- For touch inputs, you can increase the hit box of widgets (via the `style.TouchPadding` setting) to accommodate for the lack of precision of touch inputs, but it is recommended you use a mouse or gamepad to allow optimizing for screen real-estate and precision.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: I integrated Dear ImGui in my engine and little squares are showing instead of text...
+Your renderer is not using the font texture correctly or it hasn't been uploaded to the GPU.
+- If this happens using the standard backends: A) have you modified the font atlas after `ImGui_ImplXXX_NewFrame()`? B) maybe the texture failed to upload, which could happens if for some reason your texture is too big. Also see [docs/FONTS.md](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md).
+- If this happens with a custom backend: make sure you have uploaded the font texture to the GPU, that all shaders are rendering states are setup properly (e.g. texture is bound). Compare your code to existing backends and use a graphics debugger such as [RenderDoc](https://renderdoc.org) to debug your rendering states.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: I integrated Dear ImGui in my engine and some elements are clipping or disappearing when I move windows around...
+### Q: I integrated Dear ImGui in my engine and some elements are displaying outside their expected windows boundaries...
+You are probably mishandling the clipping rectangles in your render function.
+Each draw command needs the triangle rendered using the clipping rectangle provided in the ImDrawCmd structure (`ImDrawCmd->CllipRect`).
+Rectangles provided by Dear ImGui are defined as
+`(x1=left,y1=top,x2=right,y2=bottom)`
+and **NOT** as
+`(x1,y1,width,height)`
+Refer to rendering backends in the [examples/](https://github.com/ocornut/imgui/tree/master/examples) folder for references of how to handle the `ClipRect` field.
+
+##### [Return to Index](#index)
+
+---
+
+# Q&A: Usage
+
+### Q: About the ID Stack system...
+### Q: Why is my widget not reacting when I click on it?
+### Q: How can I have widgets with an empty label?
+### Q: How can I have multiple widgets with the same label?
+### Q: How can I have multiple windows with the same label?
+
+A primer on labels and the ID Stack...
+
+Dear ImGui internally needs to uniquely identify UI elements.
+Elements that are typically not clickable (such as calls to the Text functions) don't need an ID.
+Interactive widgets (such as calls to Button buttons) need a unique ID.
+
+**Unique ID are used internally to track active widgets and occasionally associate state to widgets.<BR>
+Unique ID are implicitly built from the hash of multiple elements that identify the "path" to the UI element.**
+
+Since Dear ImGui 1.85 you can use `Demo>Tools>Stack Tool` or call `ImGui::ShowStackToolWindow()`. The tool display intermediate values leading to the creation of a unique ID, making things easier to debug and understand.
+
+![Stack tool](https://user-images.githubusercontent.com/8225057/136235657-a0ea5665-dcd1-423f-9be6-dc3f8ced8f12.png)
+
+- Unique ID are often derived from a string label and at minimum scoped within their host window:
+```cpp
+Begin("MyWindow");
+Button("OK");          // Label = "OK",     ID = hash of ("MyWindow", "OK")
+Button("Cancel");      // Label = "Cancel", ID = hash of ("MyWindow", "Cancel")
+End();
+```
+- Other elements such as tree nodes, etc. also pushes to the ID stack:
+```cpp
+Begin("MyWindow");
+if (TreeNode("MyTreeNode"))
+{
+    Button("OK");      // Label = "OK",     ID = hash of ("MyWindow", "MyTreeNode", "OK")
+    TreePop();
+}
+End();
+```
+- Two items labeled "OK" in different windows or different tree locations won't collide:
+```cpp
+Begin("MyFirstWindow");
+Button("OK");          // Label = "OK",     ID = hash of ("MyFirstWindow", "OK")
+End();
+Begin("MyOtherWindow");
+Button("OK");          // Label = "OK",     ID = hash of ("MyOtherWindow", "OK")
+End();
+```
+
+- If you have a same ID twice in the same location, you'll have a conflict:
+```cpp
+Begin("MyWindow");
+Button("OK");
+Button("OK");      // ERROR: ID collision with the first button! Interacting with either button will trigger the first one.
+Button("");        // ERROR: ID collision with Begin("MyWindow")!
+End();
+```
+Fear not! this is easy to solve and there are many ways to solve it!
+
+- Solving ID conflict in a simple/local context:
+When passing a label you can optionally specify extra ID information within string itself.
+Use "##" to pass a complement to the ID that won't be visible to the end-user.
+This helps solving the simple collision cases when you know e.g. at compilation time which items
+are going to be created:
+```cpp
+Begin("MyWindow");
+Button("Play");        // Label = "Play",   ID = hash of ("MyWindow", "Play")
+Button("Play##foo1");  // Label = "Play",   ID = hash of ("MyWindow", "Play##foo1")  // Different from other buttons
+Button("Play##foo2");  // Label = "Play",   ID = hash of ("MyWindow", "Play##foo2")  // Different from other buttons
+Button("##foo");       // Label = "",       ID = hash of ("MyWindow", "##foo")       // Different from window
+End();
+```
+- If you want to completely hide the label, but still need an ID:
+```cpp
+Checkbox("##On", &b);  // Label = "",       ID = hash of (..., "##On")   // No visible label, just a checkbox!
+```
+- Occasionally/rarely you might want change a label while preserving a constant ID. This allows
+you to animate labels. For example you may want to include varying information in a window title bar,
+but windows are uniquely identified by their ID. Use "###" to pass a label that isn't part of ID:
+```cpp
+Button("Hello###ID");  // Label = "Hello",  ID = hash of (..., "###ID")
+Button("World###ID");  // Label = "World",  ID = hash of (..., "###ID")  // Same ID, different label
+
+sprintf(buf, "My game (%f FPS)###MyGame", fps);
+Begin(buf);            // Variable title,   ID = hash of "MyGame"
+```
+- Solving ID conflict in a more general manner:
+Use `PushID()` / `PopID()` to create scopes and manipulate the ID stack, as to avoid ID conflicts
+within the same window. This is the most convenient way of distinguishing ID when iterating and
+creating many UI elements programmatically.
+You can push a pointer, a string or an integer value into the ID stack.
+Remember that ID are formed from the concatenation of _everything_ pushed into the ID stack.
+At each level of the stack we store the seed used for items at this level of the ID stack.
+```cpp
+Begin("Window");
+for (int i = 0; i < 100; i++)
+{
+  PushID(i);           // Push i to the id tack
+  Button("Click");     // Label = "Click",  ID = hash of ("Window", i, "Click")
+  PopID();
+}
+for (int i = 0; i < 100; i++)
+{
+  MyObject* obj = Objects[i];
+  PushID(obj);
+  Button("Click");     // Label = "Click",  ID = hash of ("Window", obj pointer, "Click")
+  PopID();
+}
+for (int i = 0; i < 100; i++)
+{
+  MyObject* obj = Objects[i];
+  PushID(obj->Name);
+  Button("Click");     // Label = "Click",  ID = hash of ("Window", obj->Name, "Click")
+  PopID();
+}
+End();
+```
+- You can stack multiple prefixes into the ID stack:
+```cpp
+Button("Click");       // Label = "Click",  ID = hash of (..., "Click")
+PushID("node");
+  Button("Click");     // Label = "Click",  ID = hash of (..., "node", "Click")
+  PushID(my_ptr);
+    Button("Click");   // Label = "Click",  ID = hash of (..., "node", my_ptr, "Click")
+  PopID();
+PopID();
+```
+- Tree nodes implicitly creates a scope for you by calling `PushID()`:
+```cpp
+Button("Click");       // Label = "Click",  ID = hash of (..., "Click")
+if (TreeNode("node"))  // <-- this function call will do a PushID() for you (unless instructed not to, with a special flag)
+{
+  Button("Click");     // Label = "Click",  ID = hash of (..., "node", "Click")
+  TreePop();
+}
+```
+
+When working with trees, ID are used to preserve the open/close state of each tree node.
+Depending on your use cases you may want to use strings, indices or pointers as ID.
+- e.g. when following a single pointer that may change over time, using a static string as ID
+will preserve your node open/closed state when the targeted object change.
+- e.g. when displaying a list of objects, using indices or pointers as ID will preserve the
+node open/closed state differently. See what makes more sense in your situation!
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I display an image? What is ImTextureID, how does it work?
+
+Short explanation:
+- Refer to [Image Loading and Displaying Examples](https://github.com/ocornut/imgui/wiki/Image-Loading-and-Displaying-Examples) on the [Wiki](https://github.com/ocornut/imgui/wiki).
+- You may use functions such as `ImGui::Image()`, `ImGui::ImageButton()` or lower-level `ImDrawList::AddImage()` to emit draw calls that will use your own textures.
+- Actual textures are identified in a way that is up to the user/engine. Those identifiers are stored and passed as ImTextureID (void*) value.
+- Loading image files from the disk and turning them into a texture is not within the scope of Dear ImGui (for a good reason).
+
+**Please read documentations or tutorials on your graphics API to understand how to display textures on the screen before moving onward.**
+
+Long explanation:
+- Dear ImGui's job is to create "meshes", defined in a renderer-agnostic format made of draw commands and vertices. At the end of the frame those meshes (ImDrawList) will be displayed by your rendering function. They are made up of textured polygons and the code to render them is generally fairly short (a few dozen lines). In the examples/ folder we provide functions for popular graphics API (OpenGL, DirectX, etc.).
+- Each rendering function decides on a data type to represent "textures". The concept of what is a "texture" is entirely tied to your underlying engine/graphics API.
+ We carry the information to identify a "texture" in the ImTextureID type.
+ImTextureID is nothing more that a void*, aka 4/8 bytes worth of data: just enough to store 1 pointer or 1 integer of your choice.
+Dear ImGui doesn't know or understand what you are storing in ImTextureID, it merely pass ImTextureID values until they reach your rendering function.
+- In the [examples/](https://github.com/ocornut/imgui/tree/master/examples) backends, for each graphics API we decided on a type that is likely to be a good representation for specifying an image from the end-user perspective. This is what the _examples_ rendering functions are using:
+```cpp
+OpenGL:
+- ImTextureID = GLuint
+- See ImGui_ImplOpenGL3_RenderDrawData() function in imgui_impl_opengl3.cpp
+```
+```cpp
+DirectX9:
+- ImTextureID = LPDIRECT3DTEXTURE9
+- See ImGui_ImplDX9_RenderDrawData() function in imgui_impl_dx9.cpp
+```
+```cpp
+DirectX11:
+- ImTextureID = ID3D11ShaderResourceView*
+- See ImGui_ImplDX11_RenderDrawData() function in imgui_impl_dx11.cpp
+```
+```cpp
+DirectX12:
+- ImTextureID = D3D12_GPU_DESCRIPTOR_HANDLE
+- See ImGui_ImplDX12_RenderDrawData() function in imgui_impl_dx12.cpp
+```
+For example, in the OpenGL example backend we store raw OpenGL texture identifier (GLuint) inside ImTextureID.
+Whereas in the DirectX11 example backend we store a pointer to ID3D11ShaderResourceView inside ImTextureID, which is a higher-level structure tying together both the texture and information about its format and how to read it.
+
+- If you have a custom engine built over e.g. OpenGL, instead of passing GLuint around you may decide to use a high-level data type to carry information about the texture as well as how to display it (shaders, etc.). The decision of what to use as ImTextureID can always be made better knowing how your codebase is designed. If your engine has high-level data types for "textures" and "material" then you may want to use them.
+If you are starting with OpenGL or DirectX or Vulkan and haven't built much of a rendering engine over them, keeping the default ImTextureID representation suggested by the example backends is probably the best choice.
+(Advanced users may also decide to keep a low-level type in ImTextureID, and use ImDrawList callback and pass information to their renderer)
+
+User code may do:
+```cpp
+// Cast our texture type to ImTextureID / void*
+MyTexture* texture = g_CoffeeTableTexture;
+ImGui::Image((void*)texture, ImVec2(texture->Width, texture->Height));
+```
+The renderer function called after ImGui::Render() will receive that same value that the user code passed:
+```cpp
+// Cast ImTextureID / void* stored in the draw command as our texture type
+MyTexture* texture = (MyTexture*)pcmd->GetTexID();
+MyEngineBindTexture2D(texture);
+```
+Once you understand this design you will understand that loading image files and turning them into displayable textures is not within the scope of Dear ImGui.
+This is by design and is actually a good thing, because it means your code has full control over your data types and how you display them.
+If you want to display an image file (e.g. PNG file) into the screen, please refer to documentation and tutorials for the graphics API you are using.
+
+Refer to [Image Loading and Displaying Examples](https://github.com/ocornut/imgui/wiki/Image-Loading-and-Displaying-Examples) on the [Wiki](https://github.com/ocornut/imgui/wiki) to find simplified examples for loading textures with OpenGL, DirectX9 and DirectX11.
+
+C/C++ tip: a void* is pointer-sized storage. You may safely store any pointer or integer into it by casting your value to ImTextureID / void*, and vice-versa.
+Because both end-points (user code and rendering function) are under your control, you know exactly what is stored inside the ImTextureID / void*.
+Examples:
+```cpp
+GLuint my_tex = XXX;
+void* my_void_ptr;
+my_void_ptr = (void*)(intptr_t)my_tex;                  // cast a GLuint into a void* (we don't take its address! we literally store the value inside the pointer)
+my_tex = (GLuint)(intptr_t)my_void_ptr;                 // cast a void* into a GLuint
+
+ID3D11ShaderResourceView* my_dx11_srv = XXX;
+void* my_void_ptr;
+my_void_ptr = (void*)my_dx11_srv;                       // cast a ID3D11ShaderResourceView* into an opaque void*
+my_dx11_srv = (ID3D11ShaderResourceView*)my_void_ptr;   // cast a void* into a ID3D11ShaderResourceView*
+```
+Finally, you may call `ImGui::ShowMetricsWindow()` to explore/visualize/understand how the ImDrawList are generated.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I use my own math types instead of ImVec2/ImVec4?
+
+You can edit [imconfig.h](https://github.com/ocornut/imgui/blob/master/imconfig.h) and setup the `IM_VEC2_CLASS_EXTRA`/`IM_VEC4_CLASS_EXTRA` macros to add implicit type conversions.
+This way you'll be able to use your own types everywhere, e.g. passing `MyVector2` or `glm::vec2` to ImGui functions instead of `ImVec2`.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I interact with standard C++ types (such as std::string and std::vector)?
+- Being highly portable (backends/bindings for several languages, frameworks, programming style, obscure or older platforms/compilers), and aiming for compatibility & performance suitable for every modern real-time game engines, dear imgui does not use any of std C++ types. We use raw types (e.g. char* instead of std::string) because they adapt to more use cases.
+- To use ImGui::InputText() with a std::string or any resizable string class, see [misc/cpp/imgui_stdlib.h](https://github.com/ocornut/imgui/blob/master/misc/cpp/imgui_stdlib.h).
+- To use combo boxes and list boxes with `std::vector` or any other data structure: the `BeginCombo()/EndCombo()` API
+lets you iterate and submit items yourself, so does the `ListBoxHeader()/ListBoxFooter()` API.
+Prefer using them over the old and awkward `Combo()/ListBox()` api.
+- Generally for most high-level types you should be able to access the underlying data type.
+You may write your own one-liner wrappers to facilitate user code (tip: add new functions in ImGui:: namespace from your code).
+- Dear ImGui applications often need to make intensive use of strings. It is expected that many of the strings you will pass
+to the API are raw literals (free in C/C++) or allocated in a manner that won't incur a large cost on your application.
+Please bear in mind that using `std::string` on applications with large amount of UI may incur unsatisfactory performances.
+Modern implementations of `std::string` often include small-string optimization (which is often a local buffer) but those
+are not configurable and not the same across implementations.
+- If you are finding your UI traversal cost to be too large, make sure your string usage is not leading to excessive amount
+of heap allocations. Consider using literals, statically sized buffers and your own helper functions. A common pattern
+is that you will need to build lots of strings on the fly, and their maximum length can be easily be scoped ahead.
+One possible implementation of a helper to facilitate printf-style building of strings: https://github.com/ocornut/Str
+This is a small helper where you can instance strings with configurable local buffers length. Many game engines will
+provide similar or better string helpers.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I display custom shapes? (using low-level ImDrawList API)
+
+- You can use the low-level `ImDrawList` api to render shapes within a window.
+```cpp
+ImGui::Begin("My shapes");
+
+ImDrawList* draw_list = ImGui::GetWindowDrawList();
+
+// Get the current ImGui cursor position
+ImVec2 p = ImGui::GetCursorScreenPos();
+
+// Draw a red circle
+draw_list->AddCircleFilled(ImVec2(p.x + 50, p.y + 50), 30.0f, IM_COL32(255, 0, 0, 255), 16);
+
+// Draw a 3 pixel thick yellow line
+draw_list->AddLine(ImVec2(p.x, p.y), ImVec2(p.x + 100.0f, p.y + 100.0f), IM_COL32(255, 255, 0, 255), 3.0f);
+
+// Advance the ImGui cursor to claim space in the window (otherwise the window will appear small and needs to be resized)
+ImGui::Dummy(ImVec2(200, 200));
+
+ImGui::End();
+```
+![ImDrawList usage](https://raw.githubusercontent.com/wiki/ocornut/imgui/tutorials/CustomRendering01.png)
+
+- Refer to "Demo > Examples > Custom Rendering" in the demo window and read the code of `ShowExampleAppCustomRendering()` in `imgui_demo.cpp` from more examples.
+- To generate colors: you can use the macro `IM_COL32(255,255,255,255)` to generate them at compile time, or use `ImGui::GetColorU32(IM_COL32(255,255,255,255))` or `ImGui::GetColorU32(ImVec4(1.0f,1.0f,1.0f,1.0f))` to generate a color that is multiplied by the current value of `style.Alpha`.
+- Math operators: if you have setup `IM_VEC2_CLASS_EXTRA` in `imconfig.h` to bind your own math types, you can use your own math types and their natural operators instead of ImVec2. ImVec2 by default doesn't export any math operators in the public API. You may use `#define IMGUI_DEFINE_MATH_OPERATORS` `#include "imgui_internal.h"` to use the internally defined math operators, but instead prefer using your own math library and set it up in `imconfig.h`.
+- You can use `ImGui::GetBackgroundDrawList()` or `ImGui::GetForegroundDrawList()` to access draw lists which will be displayed behind and over every other dear imgui windows (one bg/fg drawlist per viewport). This is very convenient if you need to quickly display something on the screen that is not associated to a dear imgui window.
+- You can also create your own empty window and draw inside it. Call Begin() with the NoBackground | NoDecoration | NoSavedSettings | NoInputs flags (The `ImGuiWindowFlags_NoDecoration` flag itself is a shortcut for NoTitleBar | NoResize | NoScrollbar | NoCollapse). Then you can retrieve the ImDrawList* via `GetWindowDrawList()` and draw to it in any way you like.
+- You can create your own ImDrawList instance. You'll need to initialize them with `ImGui::GetDrawListSharedData()`, or create your own instancing `ImDrawListSharedData`, and then call your renderer function with your own ImDrawList or ImDrawData data.
+- Looking for fun? The [ImDrawList coding party 2020](https://github.com/ocornut/imgui/issues/3606) thread is full of "don't do this at home" extreme uses of the ImDrawList API.
+
+##### [Return to Index](#index)
+
+---
+
+# Q&A: Fonts, Text
+
+### Q: How should I handle DPI in my application?
+
+The short answer is: obtain the desired DPI scale, load your fonts resized with that scale (always round down fonts size to nearest integer), and scale your Style structure accordingly using `style.ScaleAllSizes()`.
+
+Your application may want to detect DPI change and reload the fonts and reset style between frames.
+
+Your ui code  should avoid using hardcoded constants for size and positioning. Prefer to express values as multiple of reference values such as `ImGui::GetFontSize()` or `ImGui::GetFrameHeight()`. So e.g. instead of seeing a hardcoded height of 500 for a given item/window, you may want to use `30*ImGui::GetFontSize()` instead.
+
+Down the line Dear ImGui will provide a variety of standardized reference values to facilitate using this.
+
+Applications in the `examples/` folder are not DPI aware partly because they are unable to load a custom font from the file-system (may change that in the future).
+
+The reason DPI is not auto-magically solved in stock examples is that we don't yet have a satisfying solution for the "multi-dpi"  problem (using the `docking` branch: when multiple viewport windows are over multiple monitors using different DPI scale). The current way to handle this on the application side is:
+- Create and maintain one font atlas per active DPI scale (e.g. by iterating `platform_io.Monitors[]` before `NewFrame()`).
+- Hook `platform_io.OnChangedViewport()` to detect when a `Begin()` call makes a Dear ImGui window change monitor (and therefore DPI).
+- In the hook: swap atlas, swap style with correctly sized one, remap the current font from one atlas to the other (may need to maintain a remapping table of your fonts at variying DPI scale).
+
+This approach is relatively easy and functional but come with two issues:
+- It's not possibly to reliably size or position a window ahead of `Begin()` without knowing on which monitor it'll land.
+- Style override may be lost during the `Begin()` call crossing monitor boundaries. You may need to do some custom scaling mumbo-jumbo if you want your `OnChangedViewport()` handler to preserve style overrides.
+
+Please note that if you are not using multi-viewports with multi-monitors using different DPI scale, you can ignore all of this and use the simpler technique recommended at the top.
+
+### Q: How can I load a different font than the default?
+Use the font atlas to load the TTF/OTF file you want:
+
+```cpp
+ImGuiIO& io = ImGui::GetIO();
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels);
+io.Fonts->GetTexDataAsRGBA32() or GetTexDataAsAlpha8()
+```
+
+Default is ProggyClean.ttf, monospace, rendered at size 13, embedded in dear imgui's source code.
+
+(Tip: monospace fonts are convenient because they allow to facilitate horizontal alignment directly at the string level.)
+
+(Read the [docs/FONTS.md](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md) file for more details about font loading.)
+
+New programmers: remember that in C/C++ and most programming languages if you want to use a
+backslash \ within a string literal, you need to write it double backslash "\\":
+
+```cpp
+io.Fonts->AddFontFromFileTTF("MyFolder\MyFont.ttf", size);  // WRONG (you are escaping the M here!)
+io.Fonts->AddFontFromFileTTF("MyFolder\\MyFont.ttf", size;  // CORRECT (Windows only)
+io.Fonts->AddFontFromFileTTF("MyFolder/MyFont.ttf", size);  // ALSO CORRECT
+```
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I easily use icons in my application?
+The most convenient and practical way is to merge an icon font such as FontAwesome inside you
+main font. Then you can refer to icons within your strings.
+You may want to see `ImFontConfig::GlyphMinAdvanceX` to make your icon look monospace to facilitate alignment.
+(Read the [docs/FONTS.md](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md) file for more details about icons font loading.)
+With some extra effort, you may use colorful icon by registering custom rectangle space inside the font atlas,
+and copying your own graphics data into it. See docs/FONTS.md about using the AddCustomRectFontGlyph API.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I load multiple fonts?
+Use the font atlas to pack them into a single texture:
+(Read the [docs/FONTS.md](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md) file and the code in ImFontAtlas for more details.)
+
+```cpp
+ImGuiIO& io = ImGui::GetIO();
+ImFont* font0 = io.Fonts->AddFontDefault();
+ImFont* font1 = io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels);
+ImFont* font2 = io.Fonts->AddFontFromFileTTF("myfontfile2.ttf", size_in_pixels);
+io.Fonts->GetTexDataAsRGBA32() or GetTexDataAsAlpha8()
+// the first loaded font gets used by default
+// use ImGui::PushFont()/ImGui::PopFont() to change the font at runtime
+
+// Options
+ImFontConfig config;
+config.OversampleH = 2;
+config.OversampleV = 1;
+config.GlyphOffset.y -= 1.0f;      // Move everything by 1 pixels up
+config.GlyphExtraSpacing.x = 1.0f; // Increase spacing between characters
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_pixels, &config);
+
+// Combine multiple fonts into one (e.g. for icon fonts)
+static ImWchar ranges[] = { 0xf000, 0xf3ff, 0 };
+ImFontConfig config;
+config.MergeMode = true;
+io.Fonts->AddFontDefault();
+io.Fonts->AddFontFromFileTTF("fontawesome-webfont.ttf", 16.0f, &config, ranges); // Merge icon font
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_pixels, NULL, &config, io.Fonts->GetGlyphRangesJapanese()); // Merge japanese glyphs
+```
+
+##### [Return to Index](#index)
+
+---
+
+### Q: How can I display and input non-Latin characters such as Chinese, Japanese, Korean, Cyrillic?
+When loading a font, pass custom Unicode ranges to specify the glyphs to load.
+
+```cpp
+// Add default Japanese ranges
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
+
+// Or create your own custom ranges (e.g. for a game you can feed your entire game script and only build the characters the game need)
+ImVector<ImWchar> ranges;
+ImFontGlyphRangesBuilder builder;
+builder.AddText("Hello world");                        // Add a string (here "Hello world" contains 7 unique characters)
+builder.AddChar(0x7262);                               // Add a specific character
+builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
+builder.BuildRanges(&ranges);                          // Build the final result (ordered ranges with all the unique characters submitted)
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", 16.0f, NULL, ranges.Data);
+```
+
+All your strings needs to use UTF-8 encoding. In C++11 you can encode a string literal in UTF-8
+by using the u8"hello" syntax. Specifying literal in your source code using a local code page
+(such as CP-923 for Japanese or CP-1251 for Cyrillic) will NOT work!
+Otherwise you can convert yourself to UTF-8 or load text data from file already saved as UTF-8.
+
+Text input: it is up to your application to pass the right character code by calling `io.AddInputCharacter()`.
+The applications in examples/ are doing that.
+Windows: you can use the WM_CHAR or WM_UNICHAR or WM_IME_CHAR message (depending if your app is built using Unicode or MultiByte mode).
+You may also use MultiByteToWideChar() or ToUnicode() to retrieve Unicode codepoints from MultiByte characters or keyboard state.
+Windows: if your language is relying on an Input Method Editor (IME), you can write your HWND to ImGui::GetMainViewport()->PlatformHandleRaw
+in order for the default the default implementation of io.SetPlatformImeDataFn() to set your Microsoft IME position correctly.
+
+##### [Return to Index](#index)
+
+---
+
+# Q&A: Concerns
+
+### Q: Who uses Dear ImGui?
+
+You may take a look at:
+
+- [Quotes](https://github.com/ocornut/imgui/wiki/Quotes)
+- [Software using Dear ImGui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui)
+- [Sponsors](https://github.com/ocornut/imgui/wiki/Sponsors)
+- [Gallery](https://github.com/ocornut/imgui/issues/5243)
+
+##### [Return to Index](#index)
+
+---
+
+### Q: Can you create elaborate/serious tools with Dear ImGui?
+
+Yes. People have written game editors, data browsers, debuggers, profilers and all sort of non-trivial tools with the library. In my experience the simplicity of the API is very empowering. Your UI runs close to your live data. Make the tools always-on and everybody in the team will be inclined to create new tools (as opposed to more "offline" UI toolkits where only a fraction of your team effectively creates tools). The list of sponsors below is also an indicator that serious game teams have been using the library.
+
+Dear ImGui is very programmer centric and the immediate-mode GUI paradigm might require you to readjust some habits before you can realize its full potential. Dear ImGui is about making things that are simple, efficient and powerful.
+
+Dear ImGui is built to be efficient and scalable toward the needs for AAA-quality applications running all day. The IMGUI paradigm offers different opportunities for optimization that the more typical RMGUI paradigm.
+
+##### [Return to Index](#index)
+
+---
+
+### Q: Can you reskin the look of Dear ImGui?
+
+Somehow. You can alter the look of the interface to some degree: changing colors, sizes, padding, rounding, fonts. However, as Dear ImGui is designed and optimized to create debug tools, the amount of skinning you can apply is limited. There is only so much you can stray away from the default look and feel of the interface. Dear ImGui is NOT designed to create user interface for games, although with ingenious use of the low-level API you can do it.
+
+A reasonably skinned application may look like (screenshot from [#2529](https://github.com/ocornut/imgui/issues/2529#issuecomment-524281119))
+![minipars](https://user-images.githubusercontent.com/314805/63589441-d9794f00-c5b1-11e9-8d96-cfc1b93702f7.png)
+
+##### [Return to Index](#index)
+
+---
+
+### Q: Why using C++ (as opposed to C)?
+
+Dear ImGui takes advantage of a few C++ languages features for convenience but nothing anywhere Boost insanity/quagmire. Dear ImGui doesn't use any C++ header file. Dear ImGui uses a very small subset of C++11 features. In particular, function overloading and default parameters are used to make the API easier to use and code more terse. Doing so I believe the API is sitting on a sweet spot and giving up on those features would make the API more cumbersome. Other features such as namespace, constructors and templates (in the case of the ImVector<> class) are also relied on as a convenience.
+
+There is an auto-generated [c-api for Dear ImGui (cimgui)](https://github.com/cimgui/cimgui) by Sonoro1234 and Stephan Dilly. It is designed for creating bindings to other languages. If possible, I would suggest using your target language functionalities to try replicating the function overloading and default parameters used in C++ else the API may be harder to use. Also see [Bindings](https://github.com/ocornut/imgui/wiki/Bindings) for various third-party bindings.
+
+##### [Return to Index](#index)
+
+---
+
+# Q&A: Community
+
+### Q: How can I help?
+- Businesses: please reach out to `contact AT dearimgui.com` if you work in a place using Dear ImGui! We can discuss ways for your company to fund development via invoiced technical support, maintenance or sponsoring contacts. This is among the most useful thing you can do for Dear ImGui. With increased funding, we can hire more people working on this project.
+- Individuals: you can support continued maintenance and development via PayPal donations. See [README](https://github.com/ocornut/imgui/blob/master/docs/README.md).
+- If you are experienced with Dear ImGui and C++, look at [GitHub Issues](https://github.com/ocornut/imgui/issues), [GitHub Discussions](https://github.com/ocornut/imgui/discussions), the [Wiki](https://github.com/ocornut/imgui/wiki), read [docs/TODO.txt](https://github.com/ocornut/imgui/blob/master/docs/TODO.txt) and see how you want to help and can help!
+- Disclose your usage of Dear ImGui via a dev blog post, a tweet, a screenshot, a mention somewhere etc.
+You may post screenshot or links in the [gallery threads](https://github.com/ocornut/imgui/issues/5243). Visuals are ideal as they inspire other programmers. Disclosing your use of Dear ImGui helps the library grow credibility, and help other teams and programmers with taking decisions.
+- If you have issues or if you need to hack into the library, even if you don't expect any support it is useful that you share your issues or sometimes incomplete PR.
+
+##### [Return to Index](#index)
+

extern/imgui_patched/docs/FONTS.md

@@ -0,0 +1,401 @@
+_(You may browse this at https://github.com/ocornut/imgui/blob/master/docs/FONTS.md or view this file with any Markdown viewer)_
+
+## Dear ImGui: Using Fonts
+
+The code in imgui.cpp embeds a copy of 'ProggyClean.ttf' (by Tristan Grimmer),
+a 13 pixels high, pixel-perfect font used by default. We embed it in the source code so you can use Dear ImGui without any file system access. ProggyClean does not scale smoothly, therefore it is recommended that you load your own file when using Dear ImGui in an application aiming to look nice and wanting to support multiple resolutions.
+
+You may also load external .TTF/.OTF files.
+In the [misc/fonts/](https://github.com/ocornut/imgui/tree/master/misc/fonts) folder you can find a few suggested fonts, provided as a convenience.
+
+**Also read the FAQ:** https://www.dearimgui.org/faq (there is a Fonts section!)
+
+## Index
+- [Readme First](#readme-first)
+- [How should I handle DPI in my application?](#how-should-i-handle-dpi-in-my-application)
+- [Fonts Loading Instructions](#font-loading-instructions)
+- [Using Icon Fonts](#using-icon-fonts)
+- [Using FreeType Rasterizer (imgui_freetype)](#using-freetype-rasterizer-imgui_freetype)
+- [Using Colorful Glyphs/Emojis](#using-colorful-glyphsemojis)
+- [Using Custom Glyph Ranges](#using-custom-glyph-ranges)
+- [Using Custom Colorful Icons](#using-custom-colorful-icons)
+- [Using Font Data Embedded In Source Code](#using-font-data-embedded-in-source-code)
+- [About filenames](#about-filenames)
+- [Credits/Licenses For Fonts Included In Repository](#creditslicenses-for-fonts-included-in-repository)
+- [Font Links](#font-links)
+
+---------------------------------------
+ ## Readme First
+
+- You can use the `Metrics/Debugger` window (available in `Demo>Tools`) to browse your fonts and understand what's going on if you have an issue. You can also reach it in `Demo->Tools->Style Editor->Fonts`. The same information are also available in the Style Editor under Fonts.
+
+![Fonts debugging](https://user-images.githubusercontent.com/8225057/135429892-0e41ef8d-33c5-4991-bcf6-f997a0bcfd6b.png)
+
+- You can use the `UTF-8 Encoding viewer` in `Metrics/Debugger` to verify the content of your UTF-8 strings. From C/C++ code, you can call `ImGui::DebugTextEncoding("my string");` function to verify that your UTF-8 encoding is correct.
+
+![UTF-8 Encoding viewer](https://user-images.githubusercontent.com/8225057/166505963-8a0d7899-8ee8-4558-abb2-1ae523dc02f9.png)
+
+- All loaded fonts glyphs are rendered into a single texture atlas ahead of time. Calling either of `io.Fonts->GetTexDataAsAlpha8()`, `io.Fonts->GetTexDataAsRGBA32()` or `io.Fonts->Build()` will build the atlas.
+
+- Make sure your font ranges data are persistent (available during the calls to `GetTexDataAsAlpha8()`/`GetTexDataAsRGBA32()/`Build()`.
+
+- Use C++11 u8"my text" syntax to encode literal strings as UTF-8. e.g.:
+```cpp
+u8"hello"
+u8"こんにちは"   // this will be encoded as UTF-8
+```
+
+##### [Return to Index](#index)
+
+## How should I handle DPI in my application?
+
+See [FAQ entry](https://github.com/ocornut/imgui/blob/master/docs/FAQ.md#q-how-should-i-handle-dpi-in-my-application).
+
+##### [Return to Index](#index)
+
+
+## Font Loading Instructions
+
+**Load default font:**
+```cpp
+ImGuiIO& io = ImGui::GetIO();
+io.Fonts->AddFontDefault();
+```
+
+
+**Load .TTF/.OTF file with:**
+```cpp
+ImGuiIO& io = ImGui::GetIO();
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
+```
+If you get an assert stating "Could not load font file!", your font filename is likely incorrect. Read "[About filenames](#about-filenames)" carefully.
+
+
+**Load multiple fonts:**
+```cpp
+// Init
+ImGuiIO& io = ImGui::GetIO();
+ImFont* font1 = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels);
+ImFont* font2 = io.Fonts->AddFontFromFileTTF("anotherfont.otf", size_pixels);
+```
+```cpp
+// In application loop: select font at runtime
+ImGui::Text("Hello"); // use the default font (which is the first loaded font)
+ImGui::PushFont(font2);
+ImGui::Text("Hello with another font");
+ImGui::PopFont();
+```
+
+
+**For advanced options create a ImFontConfig structure and pass it to the AddFont() function (it will be copied internally):**
+```cpp
+ImFontConfig config;
+config.OversampleH = 2;
+config.OversampleV = 1;
+config.GlyphExtraSpacing.x = 1.0f;
+ImFont* font = io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, &config);
+```
+
+
+**Combine multiple fonts into one:**
+```cpp
+// Load a first font
+ImFont* font = io.Fonts->AddFontDefault();
+
+// Add character ranges and merge into the previous font
+// The ranges array is not copied by the AddFont* functions and is used lazily
+// so ensure it is available at the time of building or calling GetTexDataAsRGBA32().
+static const ImWchar icons_ranges[] = { 0xf000, 0xf3ff, 0 }; // Will not be copied by AddFont* so keep in scope.
+ImFontConfig config;
+config.MergeMode = true;
+io.Fonts->AddFontFromFileTTF("DroidSans.ttf", 18.0f, &config, io.Fonts->GetGlyphRangesJapanese()); // Merge into first font
+io.Fonts->AddFontFromFileTTF("fontawesome-webfont.ttf", 18.0f, &config, icons_ranges);             // Merge into first font
+io.Fonts->Build();
+```
+
+**Add a fourth parameter to bake specific font ranges only:**
+
+```cpp
+// Basic Latin, Extended Latin
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesDefault());
+
+// Default + Selection of 2500 Ideographs used by Simplified Chinese
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());
+
+// Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
+```
+See [Using Custom Glyph Ranges](#using-custom-glyph-ranges) section to create your own ranges.
+
+
+**Example loading and using a Japanese font:**
+
+```cpp
+ImGuiIO& io = ImGui::GetIO();
+io.Fonts->AddFontFromFileTTF("NotoSansCJKjp-Medium.otf", 20.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+```
+```cpp
+ImGui::Text(u8"こんにちは！テスト %d", 123);
+if (ImGui::Button(u8"ロード"))
+{
+    // do stuff
+}
+ImGui::InputText("string", buf, IM_ARRAYSIZE(buf));
+ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+```
+
+![sample code output](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/code_sample_02_jp.png)
+<br>_(settings: Dark style (left), Light style (right) / Font: NotoSansCJKjp-Medium, 20px / Rounding: 5)_
+
+**Font Atlas too large?**
+
+- If you have very large number of glyphs or multiple fonts, the texture may become too big for your graphics API. The typical result of failing to upload a texture is if every glyphs appears as white rectangles.
+- Mind the fact that some graphics drivers have texture size limitation. If you are building a PC application, mind the fact that your users may use hardware with lower limitations than yours.
+
+Some solutions:
+
+1. Reduce glyphs ranges by calculating them from source localization data.
+   You can use the `ImFontGlyphRangesBuilder` for this purpose and rebuilding your atlas between frames when new characters are needed. This will be the biggest win!
+2. You may reduce oversampling, e.g. `font_config.OversampleH = 2`, this will largely reduce your texture size.
+   Note that while OversampleH = 2 looks visibly very close to 3 in most situations, with OversampleH = 1 the quality drop will be noticeable.
+3. Set `io.Fonts.TexDesiredWidth` to specify a texture width to minimize texture height (see comment in `ImFontAtlas::Build()` function).
+4. Set `io.Fonts.Flags |= ImFontAtlasFlags_NoPowerOfTwoHeight;` to disable rounding the texture height to the next power of two.
+5. Read about oversampling [here](https://github.com/nothings/stb/blob/master/tests/oversample).
+6. To support the extended range of unicode beyond 0xFFFF (e.g. emoticons, dingbats, symbols, shapes, ancient languages, etc...) add `#define IMGUI_USE_WCHAR32`in your `imconfig.h`.
+
+##### [Return to Index](#index)
+
+## Using Icon Fonts
+
+Using an icon font (such as [FontAwesome](http://fontawesome.io) or [OpenFontIcons](https://github.com/traverseda/OpenFontIcons)) is an easy and practical way to use icons in your Dear ImGui application.
+A common pattern is to merge the icon font within your main font, so you can embed icons directly from your strings without having to change fonts back and forth.
+
+To refer to the icon UTF-8 codepoints from your C++ code, you may use those headers files created by Juliette Foucaut: https://github.com/juliettef/IconFontCppHeaders.
+
+So you can use `ICON_FA_SEARCH` as a string that will render as a "Search" icon.
+
+Example Setup:
+```cpp
+// Merge icons into default tool font
+#include "IconsFontAwesome.h"
+ImGuiIO& io = ImGui::GetIO();
+io.Fonts->AddFontDefault();
+
+ImFontConfig config;
+config.MergeMode = true;
+config.GlyphMinAdvanceX = 13.0f; // Use if you want to make the icon monospaced
+static const ImWchar icon_ranges[] = { ICON_MIN_FA, ICON_MAX_FA, 0 };
+io.Fonts->AddFontFromFileTTF("fonts/fontawesome-webfont.ttf", 13.0f, &config, icon_ranges);
+```
+Example Usage:
+```cpp
+// Usage, e.g.
+ImGui::Text("%s among %d items", ICON_FA_SEARCH, count);
+ImGui::Button(ICON_FA_SEARCH " Search");
+// C string _literals_ can be concatenated at compilation time, e.g. "hello" " world"
+// ICON_FA_SEARCH is defined as a string literal so this is the same as "A" "B" becoming "AB"
+```
+See Links below for other icons fonts and related tools.
+
+Here's an application using icons ("Avoyd", https://www.avoyd.com):
+![avoyd](https://user-images.githubusercontent.com/8225057/81696852-c15d9e80-9464-11ea-9cab-2a4d4fc84396.jpg)
+
+##### [Return to Index](#index)
+
+## Using FreeType Rasterizer (imgui_freetype)
+
+- Dear ImGui uses imstb\_truetype.h to rasterize fonts (with optional oversampling). This technique and its implementation are not ideal for fonts rendered at small sizes, which may appear a little blurry or hard to read.
+- There is an implementation of the ImFontAtlas builder using FreeType that you can use in the [misc/freetype/](https://github.com/ocornut/imgui/tree/master/misc/freetype) folder.
+- FreeType supports auto-hinting which tends to improve the readability of small fonts.
+- Read documentation in the [misc/freetype/](https://github.com/ocornut/imgui/tree/master/misc/freetype) folder.
+- Correct sRGB space blending will have an important effect on your font rendering quality.
+
+##### [Return to Index](#index)
+
+## Using Colorful Glyphs/Emojis
+
+- Rendering of colored emojis is only supported by imgui_freetype with FreeType 2.10+.
+- You will need to load fonts with the `ImGuiFreeTypeBuilderFlags_LoadColor` flag.
+- Emojis are frequently encoded in upper Unicode layers (character codes >0x10000) and will need dear imgui compiled with `IMGUI_USE_WCHAR32`.
+- Not all types of color fonts are supported by FreeType at the moment.
+- Stateful Unicode features such as skin tone modifiers are not supported by the text renderer.
+
+![colored glyphs](https://user-images.githubusercontent.com/8225057/106171241-9dc4ba80-6191-11eb-8a69-ca1467b206d1.png)
+
+```cpp
+io.Fonts->AddFontFromFileTTF("../../../imgui_dev/data/fonts/NotoSans-Regular.ttf", 16.0f);
+static ImWchar ranges[] = { 0x1, 0x1FFFF, 0 };
+static ImFontConfig cfg;
+cfg.OversampleH = cfg.OversampleV = 1;
+cfg.MergeMode = true;
+cfg.FontBuilderFlags |= ImGuiFreeTypeBuilderFlags_LoadColor;
+io.Fonts->AddFontFromFileTTF("C:\\Windows\\Fonts\\seguiemj.ttf", 16.0f, &cfg, ranges);
+```
+
+##### [Return to Index](#index)
+
+## Using Custom Glyph Ranges
+
+You can use the `ImFontGlyphRangesBuilder` helper to create glyph ranges based on text input. For example: for a game where your script is known, if you can feed your entire script to it and only build the characters the game needs.
+```cpp
+ImVector<ImWchar> ranges;
+ImFontGlyphRangesBuilder builder;
+builder.AddText("Hello world");                        // Add a string (here "Hello world" contains 7 unique characters)
+builder.AddChar(0x7262);                               // Add a specific character
+builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
+builder.BuildRanges(&ranges);                          // Build the final result (ordered ranges with all the unique characters submitted)
+
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, ranges.Data);
+io.Fonts->Build();                                     // Build the atlas while 'ranges' is still in scope and not deleted.
+```
+
+##### [Return to Index](#index)
+
+## Using Custom Colorful Icons
+
+As an alternative to rendering colorful glyphs using imgui_freetype with `ImGuiFreeTypeBuilderFlags_LoadColor`, you may allocate your own space in the texture atlas and write yourself into it. **(This is a BETA api, use if you are familiar with dear imgui and with your rendering backend)**
+
+- You can use the `ImFontAtlas::AddCustomRect()` and `ImFontAtlas::AddCustomRectFontGlyph()` api to register rectangles that will be packed into the font atlas texture. Register them before building the atlas, then call Build()`.
+- You can then use `ImFontAtlas::GetCustomRectByIndex(int)` to query the position/size of your rectangle within the texture, and blit/copy any graphics data of your choice into those rectangles.
+- This API is beta because it is likely to change in order to support multi-dpi (multiple viewports on multiple monitors with varying DPI scale).
+
+#### Pseudo-code:
+```cpp
+// Add font, then register two custom 13x13 rectangles mapped to glyph 'a' and 'b' of this font
+ImFont* font = io.Fonts->AddFontDefault();
+int rect_ids[2];
+rect_ids[0] = io.Fonts->AddCustomRectFontGlyph(font, 'a', 13, 13, 13+1);
+rect_ids[1] = io.Fonts->AddCustomRectFontGlyph(font, 'b', 13, 13, 13+1);
+
+// Build atlas
+io.Fonts->Build();
+
+// Retrieve texture in RGBA format
+unsigned char* tex_pixels = NULL;
+int tex_width, tex_height;
+io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_width, &tex_height);
+
+for (int rect_n = 0; rect_n < IM_ARRAYSIZE(rect_ids); rect_n++)
+{
+    int rect_id = rects_ids[rect_n];
+    if (const ImFontAtlas::CustomRect* rect = io.Fonts->GetCustomRectByIndex(rect_id))
+    {
+        // Fill the custom rectangle with red pixels (in reality you would draw/copy your bitmap data here!)
+        for (int y = 0; y < rect->Height; y++)
+        {
+            ImU32* p = (ImU32*)tex_pixels + (rect->Y + y) * tex_width + (rect->X);
+            for (int x = rect->Width; x > 0; x--)
+                *p++ = IM_COL32(255, 0, 0, 255);
+        }
+    }
+}
+```
+
+##### [Return to Index](#index)
+
+## Using Font Data Embedded In Source Code
+
+- Compile and use [binary_to_compressed_c.cpp](https://github.com/ocornut/imgui/blob/master/misc/fonts/binary_to_compressed_c.cpp) to create a compressed C style array that you can embed in source code.
+- See the documentation in [binary_to_compressed_c.cpp](https://github.com/ocornut/imgui/blob/master/misc/fonts/binary_to_compressed_c.cpp) for instructions on how to use the tool.
+- You may find a precompiled version binary_to_compressed_c.exe for Windows inside the demo binaries package (see [README](https://github.com/ocornut/imgui/blob/master/docs/README.md)).
+- The tool can optionally output Base85 encoding to reduce the size of _source code_ but the read-only arrays in the actual binary will be about 20% bigger.
+
+Then load the font with:
+```cpp
+ImFont* font = io.Fonts->AddFontFromMemoryCompressedTTF(compressed_data, compressed_data_size, size_pixels, ...);
+```
+or
+```cpp
+ImFont* font = io.Fonts->AddFontFromMemoryCompressedBase85TTF(compressed_data_base85, size_pixels, ...);
+```
+
+##### [Return to Index](#index)
+
+## About filenames
+
+**Please note that many new C/C++ users have issues loading their files _because the filename they provide is wrong_.**
+
+Two things to watch for:
+- Make sure your IDE/debugger settings starts your executable from the right working directory. In Visual Studio you can change your working directory in project `Properties > General > Debugging > Working Directory`. People assume that their execution will start from the root folder of the project, where by default it oftens start from the folder where object or executable files are stored.
+```cpp
+// Relative filename depends on your Working Directory when running your program!
+io.Fonts->AddFontFromFileTTF("MyImage01.jpg", ...);
+
+// Load from the parent folder of your Working Directory
+io.Fonts->AddFontFromFileTTF("../MyImage01.jpg", ...);
+```
+- In C/C++ and most programming languages if you want to use a backslash `\` within a string literal, you need to write it double backslash `\\`. At it happens, Windows uses backslashes as a path separator, so be mindful.
+```cpp
+io.Fonts->AddFontFromFileTTF("MyFiles\MyImage01.jpg", ...);   // This is INCORRECT!!
+io.Fonts->AddFontFromFileTTF("MyFiles\\MyImage01.jpg", ...);  // This is CORRECT
+```
+In some situations, you may also use `/` path separator under Windows.
+
+##### [Return to Index](#index)
+
+## Credits/Licenses For Fonts Included In Repository
+
+Some fonts files are available in the `misc/fonts/` folder:
+
+**Roboto-Medium.ttf**, by Christian Robetson
+<br>Apache License 2.0
+<br>https://fonts.google.com/specimen/Roboto
+
+**Cousine-Regular.ttf**, by Steve Matteson
+<br>Digitized data copyright (c) 2010 Google Corporation.
+<br>Licensed under the SIL Open Font License, Version 1.1
+<br>https://fonts.google.com/specimen/Cousine
+
+**DroidSans.ttf**, by Steve Matteson
+<br>Apache License 2.0
+<br>https://www.fontsquirrel.com/fonts/droid-sans
+
+**ProggyClean.ttf**, by Tristan Grimmer
+<br>MIT License
+<br>(recommended loading setting: Size = 13.0, GlyphOffset.y = +1)
+<br>http://www.proggyfonts.net/
+
+**ProggyTiny.ttf**, by Tristan Grimmer
+<br>MIT License
+<br>(recommended loading setting: Size = 10.0, GlyphOffset.y = +1)
+<br>http://www.proggyfonts.net/
+
+**Karla-Regular.ttf**, by Jonathan Pinhorn
+<br>SIL OPEN FONT LICENSE Version 1.1
+
+##### [Return to Index](#index)
+
+## Font Links
+
+#### ICON FONTS
+
+- C/C++ header for icon fonts (#define with code points to use in source code string literals) https://github.com/juliettef/IconFontCppHeaders
+- FontAwesome https://fortawesome.github.io/Font-Awesome
+- OpenFontIcons https://github.com/traverseda/OpenFontIcons
+- Google Icon Fonts https://design.google.com/icons/
+- Kenney Icon Font (Game Controller Icons) https://github.com/nicodinh/kenney-icon-font
+- IcoMoon - Custom Icon font builder https://icomoon.io/app
+
+#### REGULAR FONTS
+
+- Google Noto Fonts (worldwide languages) https://www.google.com/get/noto/
+- Open Sans Fonts https://fonts.google.com/specimen/Open+Sans
+- (Japanese) M+ fonts by Coji Morishita http://mplus-fonts.sourceforge.jp/mplus-outline-fonts/index-en.html
+
+#### MONOSPACE FONTS
+
+Pixel Perfect:
+- Proggy Fonts, by Tristan Grimmer http://www.proggyfonts.net or http://upperbounds.net
+- Sweet16, Sweet16 Mono, by Martin Sedlak (Latin + Supplemental + Extended A) https://github.com/kmar/Sweet16Font (also include an .inl file to use directly in dear imgui.)
+
+Regular:
+- Google Noto Mono Fonts https://www.google.com/get/noto/
+- Typefaces for source code beautification https://github.com/chrissimpkins/codeface
+- Programmation fonts http://s9w.github.io/font_compare/
+- Inconsolata http://www.levien.com/type/myfonts/inconsolata.html
+- Adobe Source Code Pro: Monospaced font family for ui & coding environments https://github.com/adobe-fonts/source-code-pro
+- Monospace/Fixed Width Programmer's Fonts http://www.lowing.org/fonts/
+
+Or use Arial Unicode or other Unicode fonts provided with Windows for full characters coverage (not sure of their licensing).
+
+##### [Return to Index](#index)

extern/imgui_patched/docs/README.md

@@ -0,0 +1,254 @@
+Dear ImGui
+=====
+
+<center><b><i>"Give someone state and they'll have a bug one day, but teach them how to represent state in two separate locations that have to be kept in sync and they'll have bugs for a lifetime."</i></b></center> <a href="https://twitter.com/rygorous/status/1507178315886444544">-ryg</a>
+
+----
+
+[![Build Status](https://github.com/ocornut/imgui/workflows/build/badge.svg)](https://github.com/ocornut/imgui/actions?workflow=build) [![Static Analysis Status](https://github.com/ocornut/imgui/workflows/static-analysis/badge.svg)](https://github.com/ocornut/imgui/actions?workflow=static-analysis)
+
+<sub>(This library is available under a free and permissive license, but needs financial support to sustain its continued improvements. In addition to maintenance and stability there are many desirable features yet to be added. If your company is using Dear ImGui, please consider reaching out.)</sub>
+
+Businesses: support continued development and maintenance via invoiced technical support, maintenance, sponsoring contracts:
+<br>&nbsp;&nbsp;_E-mail: contact @ dearimgui dot com_
+
+Individuals: support continued development and maintenance [here](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=WGHNC6MBFLZ2S). Also see [Sponsors](https://github.com/ocornut/imgui/wiki/Sponsors) page.
+
+| [The Pitch](#the-pitch) - [Usage](#usage) - [How it works](#how-it-works) - [Releases & Changelogs](#releases--changelogs) - [Demo](#demo) - [Integration](#integration) |
+:----------------------------------------------------------: |
+| [Upcoming changes](#upcoming-changes) - [Gallery](#gallery) - [Support, FAQ](#support-frequently-asked-questions-faq) -  [How to help](#how-to-help) - [Sponsors](#sponsors) - [Credits](#credits) - [License](#license) |
+| [Wiki](https://github.com/ocornut/imgui/wiki) - [Languages & frameworks backends/bindings](https://github.com/ocornut/imgui/wiki/Bindings) - [Software using Dear ImGui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui) - [User quotes](https://github.com/ocornut/imgui/wiki/Quotes) |
+
+### The Pitch
+
+Dear ImGui is a **bloat-free graphical user interface library for C++**. It outputs optimized vertex buffers that you can render anytime in your 3D-pipeline enabled application. It is fast, portable, renderer agnostic and self-contained (no external dependencies).
+
+Dear ImGui is designed to **enable fast iterations** and to **empower programmers** to create **content creation tools and visualization / debug tools** (as opposed to UI for the average end-user). It favors simplicity and productivity toward this goal, and lacks certain features normally found in more high-level libraries.
+
+Dear ImGui is particularly suited to integration in games engine (for tooling), real-time 3D applications, fullscreen applications, embedded applications, or any applications on consoles platforms where operating system features are non-standard.
+
+ - Easy to use to create code-driven and data-driven tools.
+ - Easy to use to create ad hoc short-lived tools and long-lived, more elaborate tools.
+ - Easy to hack and improve.
+ - Minimize setup and maintenance.
+ - Minimize state storage on user side.
+ - Minimize state synchronization.
+ - Portable, minimize dependencies, run on target (consoles, phones, etc.).
+ - Efficient runtime and memory consumption.
+ - Battle-tested, used by many major actors in the game industry.
+
+### Usage
+
+**The core of Dear ImGui is self-contained within a few platform-agnostic files** which you can easily compile in your application/engine. They are all the files in the root folder of the repository (imgui*.cpp, imgui*.h).
+
+**No specific build process is required**. You can add the .cpp files to your existing project.
+
+You will need a backend to integrate Dear ImGui in your app. The backend passes mouse/keyboard/gamepad inputs and variety of settings to Dear ImGui, and is in charge of rendering the resulting vertices. **Backends for a variety of graphics api and rendering platforms** are provided in the [backends/](https://github.com/ocornut/imgui/tree/master/backends) folder, along with example applications in the [examples/](https://github.com/ocornut/imgui/tree/master/examples) folder. See the [Integration](#integration) section of this document for details. You may also create your own backend. Anywhere where you can render textured triangles, you can render Dear ImGui.
+
+After Dear ImGui is setup in your application, you can use it from \_anywhere\_ in your program loop:
+
+Code:
+```cpp
+ImGui::Text("Hello, world %d", 123);
+if (ImGui::Button("Save"))
+    MySaveFunction();
+ImGui::InputText("string", buf, IM_ARRAYSIZE(buf));
+ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+```
+Result:
+<br>![sample code output (dark)](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v175/capture_readme_styles_0001.png) ![sample code output (light)](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v175/capture_readme_styles_0002.png)
+
+Code:
+```cpp
+// Create a window called "My First Tool", with a menu bar.
+ImGui::Begin("My First Tool", &my_tool_active, ImGuiWindowFlags_MenuBar);
+if (ImGui::BeginMenuBar())
+{
+    if (ImGui::BeginMenu("File"))
+    {
+        if (ImGui::MenuItem("Open..", "Ctrl+O")) { /* Do stuff */ }
+        if (ImGui::MenuItem("Save", "Ctrl+S"))   { /* Do stuff */ }
+        if (ImGui::MenuItem("Close", "Ctrl+W"))  { my_tool_active = false; }
+        ImGui::EndMenu();
+    }
+    ImGui::EndMenuBar();
+}
+
+// Edit a color (stored as ~4 floats)
+ImGui::ColorEdit4("Color", my_color);
+
+// Plot some values
+const float my_values[] = { 0.2f, 0.1f, 1.0f, 0.5f, 0.9f, 2.2f };
+ImGui::PlotLines("Frame Times", my_values, IM_ARRAYSIZE(my_values));
+
+// Display contents in a scrolling region
+ImGui::TextColored(ImVec4(1,1,0,1), "Important Stuff");
+ImGui::BeginChild("Scrolling");
+for (int n = 0; n < 50; n++)
+    ImGui::Text("%04d: Some text", n);
+ImGui::EndChild();
+ImGui::End();
+```
+Result:
+<br>![sample code output](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v180/code_sample_04_color.gif)
+
+Dear ImGui allows you to **create elaborate tools** as well as very short-lived ones. On the extreme side of short-livedness: using the Edit&Continue (hot code reload) feature of modern compilers you can add a few widgets to tweaks variables while your application is running, and remove the code a minute later! Dear ImGui is not just for tweaking values. You can use it to trace a running algorithm by just emitting text commands. You can use it along with your own reflection data to browse your dataset live. You can use it to expose the internals of a subsystem in your engine, to create a logger, an inspection tool, a profiler, a debugger, an entire game making editor/framework, etc.
+
+### How it works
+
+Check out the Wiki's [About the IMGUI paradigm](https://github.com/ocornut/imgui/wiki#about-the-imgui-paradigm) section if you want to understand the core principles behind the IMGUI paradigm. An IMGUI tries to minimize superfluous state duplication, state synchronization and state retention from the user's point of view. It is less error prone (less code and less bugs) than traditional retained-mode interfaces, and lends itself to create dynamic user interfaces.
+
+Dear ImGui outputs vertex buffers and command lists that you can easily render in your application. The number of draw calls and state changes required to render them is fairly small. Because Dear ImGui doesn't know or touch graphics state directly, you can call its functions  anywhere in your code (e.g. in the middle of a running algorithm, or in the middle of your own rendering process). Refer to the sample applications in the examples/ folder for instructions on how to integrate Dear ImGui with your existing codebase.
+
+_A common misunderstanding is to mistake immediate mode gui for immediate mode rendering, which usually implies hammering your driver/GPU with a bunch of inefficient draw calls and state changes as the gui functions are called. This is NOT what Dear ImGui does. Dear ImGui outputs vertex buffers and a small list of draw calls batches. It never touches your GPU directly. The draw call batches are decently optimal and you can render them later, in your app or even remotely._
+
+### Releases & Changelogs
+
+See [Releases](https://github.com/ocornut/imgui/releases) page.
+Reading the changelogs is a good way to keep up to date with the things Dear ImGui has to offer, and maybe will give you ideas of some features that you've been ignoring until now!
+
+### Demo
+
+Calling the `ImGui::ShowDemoWindow()` function will create a demo window showcasing variety of features and examples. The code is always available for reference in `imgui_demo.cpp`.
+
+![screenshot demo](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v167/v167-misc.png)
+
+You should be able to build the examples from sources (tested on Windows/Mac/Linux). If you don't, let us know! If you want to have a quick look at some Dear ImGui features, you can download Windows binaries of the demo app here:
+- [imgui-demo-binaries-20220504.zip](https://www.dearimgui.org/binaries/imgui-demo-binaries-20220504.zip) (Windows, 1.88 WIP, built 2022/05/04, master branch) or [older demo binaries](https://www.dearimgui.org/binaries).
+
+The demo applications are not DPI aware so expect some blurriness on a 4K screen. For DPI awareness in your application, you can load/reload your font at different scale, and scale your style with `style.ScaleAllSizes()` (see [FAQ](https://www.dearimgui.org/faq)).
+
+### Integration
+
+On most platforms and when using C++, **you should be able to use a combination of the [imgui_impl_xxxx](https://github.com/ocornut/imgui/tree/master/backends) backends without modification** (e.g. `imgui_impl_win32.cpp` + `imgui_impl_dx11.cpp`). If your engine supports multiple platforms, consider using more of the imgui_impl_xxxx files instead of rewriting them: this will be less work for you and you can get Dear ImGui running immediately. You can _later_ decide to rewrite a custom backend using your custom engine functions if you wish so.
+
+Integrating Dear ImGui within your custom engine is a matter of 1) wiring mouse/keyboard/gamepad inputs 2) uploading one texture to your GPU/render engine 3) providing a render function that can bind textures and render textured triangles. The [examples/](https://github.com/ocornut/imgui/tree/master/examples) folder is populated with applications doing just that. If you are an experienced programmer at ease with those concepts, it should take you less than two hours to integrate Dear ImGui in your custom engine. **Make sure to spend time reading the [FAQ](https://www.dearimgui.org/faq), comments, and some of the examples/ application!**
+
+Officially maintained backends/bindings (in repository):
+- Renderers: DirectX9, DirectX10, DirectX11, DirectX12, Metal, OpenGL/ES/ES2, SDL_Renderer, Vulkan, WebGPU.
+- Platforms: GLFW, SDL2, Win32, Glut, OSX, Android.
+- Frameworks: Allegro5, Emscripten.
+
+[Third-party backends/bindings](https://github.com/ocornut/imgui/wiki/Bindings) wiki page:
+- Languages: C, C# and: Beef, ChaiScript, Crystal, D, Go, Haskell, Haxe/hxcpp, Java, JavaScript, Julia, Kotlin, Lobster, Lua, Odin, Pascal, PureBasic, Python, Ruby, Rust, Swift...
+- Frameworks: AGS/Adventure Game Studio, Amethyst, Blender, bsf, Cinder, Cocos2d-x, Diligent Engine, Flexium, GML/Game Maker Studio2, GLEQ, Godot, GTK3+OpenGL3, Irrlicht Engine, LÖVE+LUA, Magnum, Monogame, NanoRT, nCine, Nim Game Lib, Nintendo 3DS & Switch (homebrew), Ogre, openFrameworks, OSG/OpenSceneGraph, Orx, Photoshop, px_render, Qt/QtDirect3D, SDL_Renderer, SFML, Sokol, Unity, Unreal Engine 4, vtk, VulkanHpp, VulkanSceneGraph, Win32 GDI, WxWidgets.
+- Note that C bindings ([cimgui](https://github.com/cimgui/cimgui)) are auto-generated, you can use its json/lua output to generate bindings for other languages.
+
+[Useful Extensions/Widgets](https://github.com/ocornut/imgui/wiki/Useful-Extensions) wiki page:
+- Text editors, node editors, timeline editors, plotting, software renderers, remote network access, memory editors, gizmos etc.
+
+Also see [Wiki](https://github.com/ocornut/imgui/wiki) for more links and ideas.
+
+### Upcoming Changes
+
+Some of the goals for 2022 are:
+- Work on Docking (see [#2109](https://github.com/ocornut/imgui/issues/2109), in public [docking](https://github.com/ocornut/imgui/tree/docking) branch)
+- Work on Multi-Viewport / Multiple OS windows. (see [#1542](https://github.com/ocornut/imgui/issues/1542), in public [docking](https://github.com/ocornut/imgui/tree/docking) branch looking for feedback)
+- Work on gamepad/keyboard controls. (see [#787](https://github.com/ocornut/imgui/issues/787))
+- Work on automation and testing system, both to test the library and end-user apps. (see [#435](https://github.com/ocornut/imgui/issues/435))
+- Make the examples look better, improve styles, improve font support, make the examples hi-DPI and multi-DPI aware.
+
+### Gallery
+
+For more user-submitted screenshots of projects using Dear ImGui, check out the [Gallery Threads](https://github.com/ocornut/imgui/issues/5243)!
+
+For a list of third-party widgets and extensions, check out the [Useful Extensions/Widgets](https://github.com/ocornut/imgui/wiki/Useful-Extensions) wiki page.
+
+Custom engine [ehre](https://github.com/tksuoran/erhe) (docking branch)
+[![ehre](https://user-images.githubusercontent.com/8225057/166686854-3f76bf28-0442-4fac-8e65-9fc9650d2ed0.jpg)](https://user-images.githubusercontent.com/994606/147875067-a848991e-2ad2-4fd3-bf71-4aeb8a547bcf.png)
+
+Custom engine for [Wonder Boy: The Dragon's Trap](http://www.TheDragonsTrap.com) (2017)
+[![screenshot game](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v149/gallery_TheDragonsTrap-01-thumb.jpg)](https://cloud.githubusercontent.com/assets/8225057/20628927/33e14cac-b329-11e6-80f6-9524e93b048a.png)
+
+Custom engine (untitled)
+[![screenshot tool](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/editor_white_preview.jpg)](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v160/editor_white.png)
+
+[Tracy Profiler](https://github.com/wolfpld/tracy)
+![tracy profiler](https://raw.githubusercontent.com/wiki/ocornut/imgui/web/v176/tracy_profiler.png)
+
+### Support, Frequently Asked Questions (FAQ)
+
+See: [Frequently Asked Questions (FAQ)](https://github.com/ocornut/imgui/blob/master/docs/FAQ.md) where common questions are answered.
+
+See: [Wiki](https://github.com/ocornut/imgui/wiki) for many links, references, articles.
+
+See: [Articles about the IMGUI paradigm](https://github.com/ocornut/imgui/wiki#about-the-imgui-paradigm) to read/learn about the Immediate Mode GUI paradigm.
+
+Getting started? For first-time users having issues compiling/linking/running or issues loading fonts, please use [GitHub Discussions](https://github.com/ocornut/imgui/discussions).
+
+For other questions, bug reports, requests, feedback, you may post on [GitHub Issues](https://github.com/ocornut/imgui/issues). Please read and fill the New Issue template carefully.
+
+Private support is available for paying business customers (E-mail: _contact @ dearimgui dot com_).
+
+**Which version should I get?**
+
+We occasionally tag [Releases](https://github.com/ocornut/imgui/releases) but it is generally safe and recommended to sync to master/latest. The library is fairly stable and regressions tend to be fixed fast when reported.
+
+Advanced users may want to use the `docking` branch with [Multi-Viewport](https://github.com/ocornut/imgui/issues/1542) and [Docking](https://github.com/ocornut/imgui/issues/2109) features. This branch is kept in sync with master regularly.
+
+**Who uses Dear ImGui?**
+
+See the [Quotes](https://github.com/ocornut/imgui/wiki/Quotes), [Sponsors](https://github.com/ocornut/imgui/wiki/Sponsors), [Software using dear imgui](https://github.com/ocornut/imgui/wiki/Software-using-dear-imgui) Wiki pages for an idea of who is using Dear ImGui. Please add your game/software if you can! Also see the [Gallery Threads](https://github.com/ocornut/imgui/issues/5243)!
+
+How to help
+-----------
+
+**How can I help?**
+
+- See [GitHub Forum/issues](https://github.com/ocornut/imgui/issues) and [Github Discussions](https://github.com/ocornut/imgui/discussions).
+- You may help with development and submit pull requests! Please understand that by submitting a PR you are also submitting a request for the maintainer to review your code and then take over its maintenance forever. PR should be crafted both in the interest in the end-users and also to ease the maintainer into understanding and accepting it.
+- See [Help wanted](https://github.com/ocornut/imgui/wiki/Help-Wanted) on the [Wiki](https://github.com/ocornut/imgui/wiki/) for some more ideas.
+- Have your company financially support this project (please reach by e-mail)
+
+**How can I help financing further development of Dear ImGui?**
+
+See [Sponsors](https://github.com/ocornut/imgui/wiki/Sponsors) page.
+
+Sponsors
+--------
+
+Ongoing Dear ImGui development is currently financially supported in 2021-2022 by users and private sponsors:
+
+*Platinum-chocolate sponsors*
+- [Blizzard](https://careers.blizzard.com/en-us/openings/engineering/all/all/all/1)
+
+*Double-chocolate sponsors*
+- [Ubisoft](https://montreal.ubisoft.com/en/ubisoft-sponsors-user-interface-library-for-c-dear-imgui), [Supercell](https://supercell.com)
+
+*Chocolate sponsors*
+- [Adobe](https://www.adobe.com/products/medium.html), [Aras Pranckevičius](https://aras-p.info), [Epic](https://www.unrealengine.com/en-US/megagrants), [G3Dvu]().
+
+*Salty-caramel sponsors*
+- [Kylotonn](https://www.kylotonn.com), [O-Net Communications (USA)](http://en.o-netcom.com), [Wonderland Engine](https://wonderlandengine.com/).
+
+Please see [detailed list of current and past Dear ImGui supporters](https://github.com/ocornut/imgui/wiki/Sponsors) for more.
+From November 2014 to December 2019, ongoing development has also been financially supported by its users on Patreon and through individual donations.
+
+**THANK YOU to all past and present supporters for helping to keep this project alive and thriving!**
+
+Dear ImGui is using software and services provided free of charge for open source projects:
+- [PVS-Studio](https://www.viva64.com/en/b/0570/) for static analysis.
+- [GitHub actions](https://github.com/features/actions) for continuous integration systems.
+- [OpenCppCoverage](https://github.com/OpenCppCoverage/OpenCppCoverage) for code coverage analysis.
+
+Credits
+-------
+
+Developed by [Omar Cornut](https://www.miracleworld.net) and every direct or indirect [contributors](https://github.com/ocornut/imgui/graphs/contributors) to the GitHub. The early version of this library was developed with the support of [Media Molecule](https://www.mediamolecule.com) and first used internally on the game [Tearaway](https://tearaway.mediamolecule.com) (PS Vita).
+
+Recurring contributors (2022): Omar Cornut [@ocornut](https://github.com/ocornut), Rokas Kupstys [@rokups](https://github.com/rokups) (a large portion of work on automation systems, regression tests and other features are currently unpublished).
+
+Sponsoring, support contracts and other B2B transactions are hosted and handled by [Lizardcube](https://www.lizardcube.com).
+
+Omar: "I first discovered the IMGUI paradigm at [Q-Games](https://www.q-games.com) where Atman Binstock had dropped his own simple implementation in the codebase, which I spent quite some time improving and thinking about. It turned out that Atman was exposed to the concept directly by working with Casey. When I moved to Media Molecule I rewrote a new library trying to overcome the flaws and limitations of the first one I've worked with. It became this library and since then I have spent an unreasonable amount of time iterating and improving it."
+
+Embeds [ProggyClean.ttf](http://upperbounds.net) font by Tristan Grimmer (MIT license).
+
+Embeds [stb_textedit.h, stb_truetype.h, stb_rect_pack.h](https://github.com/nothings/stb/) by Sean Barrett (public domain).
+
+Inspiration, feedback, and testing for early versions: Casey Muratori, Atman Binstock, Mikko Mononen, Emmanuel Briney, Stefan Kamoda, Anton Mikhailov, Matt Willis. Also thank you to everyone posting feedback, questions and patches on GitHub.
+
+License
+-------
+
+Dear ImGui is licensed under the MIT License, see [LICENSE.txt](https://github.com/ocornut/imgui/blob/master/LICENSE.txt) for more information.

extern/imgui_patched/docs/TODO.txt

@@ -0,0 +1,411 @@
+dear imgui
+ISSUES & TODO LIST
+
+Issue numbers (#) refer to GitHub issues listed at https://github.com/ocornut/imgui/issues/XXXX
+This list is not well maintained, most of the work happens on GitHub nowadays.
+The list below consist mostly of ideas noted down before they are requested/discussed by users (at which point they usually exist on the github issue tracker).
+It's mostly a bunch of personal notes, probably incomplete. Feel free to query if you have any questions.
+
+ - doc/test: add a proper documentation+regression testing system (#435)
+ - doc/test: checklist app to verify backends/integration of imgui (test inputs, rendering, callback, etc.).
+ - doc/tips: tips of the day: website? applet in imgui_club?
+ - doc/wiki: work on the wiki https://github.com/ocornut/imgui/wiki
+
+ - window: preserve/restore relative focus ordering (persistent or not), and e.g. of multiple reappearing windows (#2304) -> also see docking reference to same #.
+ - window: calling SetNextWindowSize() every frame with <= 0 doesn't do anything, may be useful to allow (particularly when used for a single axis). (#690)
+ - window: add a way for very transient windows (non-saved, temporary overlay over hundreds of objects) to "clean" up from the global window list. perhaps a lightweight explicit cleanup pass.
+ - window: auto-fit feedback loop when user relies on any dynamic layout (window width multiplier, column) appears weird to end-user. clarify.
+ - window: begin with *p_open == false could return false.
+ - window: get size/pos helpers given names (see discussion in #249)
+ - window: when window is very small, prioritize resize button over close button.
+ - window: double-clicking on title bar to minimize isn't consistent, perhaps move to single-click on left-most collapse icon?
+ - window: expose contents size. (#1045)
+ - window: using SetWindowPos() inside Begin() and moving the window with the mouse reacts a very ugly glitch. We should just defer the SetWindowPos() call.
+ - window: GetWindowSize() returns (0,0) when not calculated? (#1045)
+ - window: investigate better auto-positioning for new windows.
+ - window: top most window flag? more z-order contrl? (#2574)
+ - window/size: manually triggered auto-fit (double-click on grip) shouldn't resize window down to viewport size?
+ - window/size: how to allow to e.g. auto-size vertically to fit contents, but be horizontally resizable? Assuming SetNextWindowSize() is modified to treat -1.0f on each axis as "keep as-is" (would be good but might break erroneous code): Problem is UpdateWindowManualResize() and lots of code treat (window->AutoFitFramesX > 0 || window->AutoFitFramesY > 0) together.
+ - window/opt: freeze window flag: if not focused/hovered, return false, render with previous ImDrawList. and/or reduce refresh rate. -> this may require enforcing that it is illegal to submit contents if Begin returns false.
+ - window/child: background options for child windows, border option (disable rounding).
+ - window/child: allow resizing of child windows (possibly given min/max for each axis?.)
+ - window/child: allow SetNextWindowContentSize() to work on child windows.
+ - window/clipping: some form of clipping when DisplaySize (or corresponding viewport) is zero.
+ - window/tabbing: add a way to signify that a window or docked window requires attention (e.g. blinking title bar).
+ - window/id_stack: add e.g. window->GetIDFromPath() with support for leading / and ../ (#1390, #331)
+ ! scrolling: exposing horizontal scrolling with Shift+Wheel even when scrollbar is disabled expose lots of issues (#2424, #1463)
+ - scrolling: while holding down a scrollbar, try to keep the same contents visible (at least while not moving mouse)
+ - scrolling: allow immediately effective change of scroll after Begin() if we haven't appended items yet.
+ - scrolling: forward mouse wheel scrolling to parent window when at the edge of scrolling limits? (useful for listbox,tables?)
+ - scrolling/clipping: separator on the initial position of a window is not visible (cursorpos.y <= clippos.y). (2017-08-20: can't repro)
+ - scrolling/style: shadows on scrollable areas to denote that there is more contents (see e.g. DaVinci Resolve ui)
+
+ - drawdata: make it easy to deep-copy (or swap?) a full ImDrawData so user can easily save that data if they use threaded rendering. (e.g. #2646)
+ ! drawlist: add CalcTextSize() func to facilitate consistent code from user pov (currently need to use ImGui or ImFont alternatives!)
+ - drawlist: maintaining bounding box per command would allow to merge draw command when clipping isn't relied on (typical non-scrolling window or non-overflowing column would merge with previous command). (WIP branch)
+ - drawlist: primitives/helpers to manipulate vertices post submission, so e.g. a quad/rect can be resized to fit later submitted content, _without_ using the ChannelSplit api
+ - drawlist: make it easier to toggle AA per primitive, so we can use e.g. non-AA fill + AA borders more naturally
+ - drawlist: non-AA strokes have gaps between points (#593, #288), glitch especially on RenderCheckmark() and ColorPicker4().
+ - drawlist: rendering: provide a way for imgui to output to a single/global vertex buffer, re-order indices only at the end of the frame (ref: https://gist.github.com/floooh/10388a0afbe08fce9e617d8aefa7d302)
+ - drawlist: callback: add an extra void* in ImDrawCallback to allow passing render-local data to the callback (would break API).
+ - drawlist: AddRect vs AddLine position confusing (#2441)
+ - drawlist/opt: store rounded corners in texture to use 1 quad per corner (filled and wireframe) to lower the cost of rounding. (#1962)
+ - drawlist/opt: AddRect() axis aligned pixel aligned (no-aa) could use 8 triangles instead of 16 and no normal calculation.
+ - drawlist/opt: thick AA line could be doable in same number of triangles as 1.0 AA line by storing gradient+full color in atlas.
+
+ - main: IsItemHovered() info stored in a stack? so that 'if TreeNode() { Text; TreePop; } if IsHovered' return the hover state of the TreeNode?
+
+ - widgets: display mode: widget-label, label-widget (aligned on column or using fixed size), label-newline-tab-widget etc. (#395)
+ - widgets: clean up widgets internal toward exposing everything and stabilizing imgui_internals.h.
+ - widgets: add always-allow-overlap mode. This should perhaps be the default? one problem is that highlight after mouse-wheel scrolling gets deferred, makes scrolling more flickery.
+ - widgets: start exposing PushItemFlag() and ImGuiItemFlags
+ - widgets: alignment options in style (e.g. center Selectable, Right-Align within Button, etc.) #1260
+ - widgets: activate by identifier (trigger button, focus given id)
+ - widgets: a way to represent "mixed" values, so e.g. all values replaced with *, including check-boxes, colors, etc. with support for multi-components widgets (e.g. SliderFloat3, make only "Y" mixed) (#2644)
+ - widgets: checkbox: checkbox with custom glyph inside frame.
+ - widgets: coloredit: keep reporting as active when picker is on?
+ - widgets: group/scalarn functions: expose more per-component information. e.g. store NextItemData.ComponentIdx set by scalarn function, groups can expose them back somehow.
+ - selectable: using (size.x == 0.0f) and (SelectableTextAlign.x > 0.0f) followed by SameLine() is currently not supported.
+ - selectable: generic BeginSelectable()/EndSelectable() mechanism. (work out alongside range-select branch)
+ - selectable: a way to visualize partial/mixed selection (e.g. parent tree node has children with mixed selection)
+
+ - input text: clean up the mess caused by converting UTF-8 <> wchar. the code is rather inefficient right now and super fragile. (WIP branch)
+ - input text: preserve scrolling when unfocused?
+ - input text: reorganize event handling, allow CharFilter to modify buffers, allow multiple events? (#541)
+ - input text: expose CursorPos in char filter event (#816)
+ - input text: try usage idiom of using InputText with data only exposed through get/set accessors, without extraneous copy/alloc. (#3009)
+ - input text: access public fields via a non-callback API e.g. InputTextGetState("xxx") that may return NULL if not active (available in internals)
+ - input text: flag to disable live update of the user buffer (also applies to float/int text input) (#701)
+ - input text: hover tooltip could show unclamped text
+ - input text: support for INSERT key to toggle overwrite mode. currently disabled because stb_textedit behavior is unsatisfactory on multi-line. (#2863)
+ - input text: option to Tab after an Enter validation.
+ - input text: add ImGuiInputTextFlags_EnterToApply? (off #218)
+ - input text: easier ways to update buffer (from source char*) while owned. preserve some sort of cursor position for multi-line text.
+ - input text: add flag (e.g. ImGuiInputTextFlags_EscapeClearsBuffer) to clear instead of revert. what to do with focus? (also see #2890)
+ - input text: add discard flag (e.g. ImGuiInputTextFlags_DiscardActiveBuffer) or make it easier to clear active focus for text replacement during edition (#725)
+ - input text: display bug when clicking a drag/slider after an input text in a different window has all-selected text (order dependent). actually a very old bug but no one appears to have noticed it.
+ - input text: allow centering/positioning text so that ctrl+clicking Drag or Slider keeps the textual value at the same pixel position.
+ - input text: decorrelate display layout from inputs with custom template - e.g. what's the easiest way to implement a nice IP/Mac address input editor?
+ - input text: global callback system so user can plug in an expression evaluator easily. (#1691)
+ - input text: force scroll to end or scroll to a given line/contents (so user can implement a log or a search feature)
+ - input text: a way to preview completion (e.g. disabled text completing from the cursor)
+ - input text: a side bar that could e.g. preview where errors are. probably left to the user to draw but we'd need to give them the info there.
+ - input text: a way for the user to provide syntax coloring.
+ - input text: Shift+TAB with ImGuiInputTextFlags_AllowTabInput could eat preceding blanks, up to tab_count.
+ - input text multi-line: don't directly call AddText() which does an unnecessary vertex reserve for character count prior to clipping. and/or more line-based clipping to AddText(). and/or reorganize TextUnformatted/RenderText for more efficiency for large text (e.g TextUnformatted could clip and log separately, etc).
+ - input text multi-line: support for copy/cut without selection (copy/cut current line?)
+ - input text multi-line: line numbers? status bar? (follow up on #200)
+ - input text multi-line: behave better when user changes input buffer while editing is active (even though it is illegal behavior). namely, the change of buffer can create a scrollbar glitch (#725)
+ - input text multi-line: better horizontal scrolling support (#383, #1224)
+ - input text multi-line: single call to AddText() should be coarse clipped on InputTextEx() end.
+ - input number: optional range min/max for Input*() functions
+ - input number: holding [-]/[+] buttons could increase the step speed non-linearly (or user-controlled)
+ - input number: use mouse wheel to step up/down
+
+ - layout: helper or a way to express ImGui::SameLine(ImGui::GetCursorStartPos().x + ImGui::CalcItemWidth() + ImGui::GetStyle().ItemInnerSpacing.x); in a simpler manner.
+ - layout, font: horizontal tab support, A) text mode: forward only tabs (e.g. every 4 characters/N pixels from pos x1), B) manual mode: explicit tab stops acting as mini columns, no clipping (for menu items, many kind of uses, also vaguely relate to #267, #395)
+ - layout: horizontal layout helper (#97)
+ - layout: horizontal flow until no space left (#404)
+ - layout: more generic alignment state (left/right/centered) for single items?
+ - layout: clean up the InputFloatN/SliderFloatN/ColorEdit4 layout code. item width should include frame padding.
+ - layout: vertical alignment of mixed height items (e.g. buttons) within a same line (#1284)
+ - layout: null layout mode were items are not rendered but user can query GetItemRectMin()/Max/Size.
+ - layout: (R&D) local multi-pass layout mode.
+ - layout: (R&D) bind authored layout data (created by an off-line tool), items fetch their pos/size at submission, self-optimize data structures to stable linear access.
+
+ - group: BeginGroup() needs a border option. (~#1496)
+ - group: IsHovered() after EndGroup() covers whole AABB rather than the intersection of individual items. Is that desirable?
+ - group: merge deactivation/activation within same group (fwd WasEdited flag). (#2550)
+
+!- color: the color conversion helpers/types are a mess and needs sorting out.
+ - color: (api breaking) ImGui::ColorConvertXXX functions should be loose ImColorConvertXX to match imgui_internals.h
+
+ - plot: full featured plot/graph api w/ scrolling, zooming etc. all bell & whistle. why not!
+ - plot: PlotLines() should use the polygon-stroke facilities, less vertices (currently issues with averaging normals)
+ - plot: make it easier for user to draw extra stuff into the graph (e.g: draw basis, highlight certain points, 2d plots, multiple plots)
+ - plot: "smooth" automatic scale over time, user give an input 0.0(full user scale) 1.0(full derived from value)
+ - plot: option/feature: draw the zero line
+ - plot: option/feature: draw grid, vertical markers
+ - plot: option/feature: draw unit
+ - plot: add a helper e.g. Plot(char* label, float value, float time_span=2.0f) that stores values and Plot them for you - probably another function name. and/or automatically allow to plot ANY displayed value (more reliance on stable ID)
+
+ - clipper: ability to disable the clipping through a simple flag/bool.
+ - clipper: ability to run without knowing full count in advance.
+ - clipper: horizontal clipping support. (#2580)
+
+ - separator: expose flags (#759)
+ - separator: take indent into consideration (optional)
+ - separator: width, thickness, centering (#1643)
+ - splitter: formalize the splitter idiom into an official api (we want to handle n-way split) (#319)
+
+ - docking: merge docking branch (#2109)
+ - docking: B: ordering currently held in tab bar should be implicitly held by windows themselves (also see #2304)
+ - docking: B- tab bar: the order/focus restoring code could be part of TabBar and not DockNode? (#8)
+ - docking: B~ rework code to be able to lazily create tab bar instance in a single place. The _Unsorted tab flag could be replacing a trailing-counter in DockNode?
+ - docking: B~ fully track windows/settings reference in dock nodes. perhaps find a representation that allows facilitate use of dock builder functions.
+ - docking: B~ Unreal style document system (requires low-level controls of dockspace serialization fork/copy/delete). this is mostly working but the DockBuilderXXX api are not exposed/finished.
+ - docking: B: when docking outer, perform size locking on neighbors nodes the same way we do it with splitters, so other nodes are not resized.
+ - docking: B~ central node resizing behavior incorrect.
+ - docking: B: changing title font/style per-window is not supported as dock nodes are created in NewFrame.
+ - docking: B- dock node inside its own viewports creates 1 temporary viewport per window on startup before ditching them (doesn't affect the user nor request platform windows to be created, but unnecessary)
+ - docking: B- resize sibling locking behavior may be less desirable if we merged same-axis sibling in a same node level?
+ - docking: B- single visible node part of a hidden split hierarchy (OnlyNodeWithWindows != NULL) should show a normal title bar (not a tab bar)
+ - docking: B~ SetNextWindowDock() calls (with conditional) -> defer everything to DockContextUpdate (repro: Documents->[X]Windows->Dock 1 elsewhere->Click Redock All
+ - docking: B~ tidy up tab list popup buttons features (available with manual tab-bar, see ImGuiTabBarFlags_NoTabListPopupButton code, not used by docking nodes)
+ - docking: B- SetNextWindowDockId(0) with a second Begin() in the frame will asserts
+ - docking: B: resize grip drawn in host window typically appears under scrollbar.
+ - docking: B: resize grip auto-resize on multiple node hierarchy doesn't make much sense or should be improved?
+ - docking: B- SetNextWindowFocus() doesn't seem to apply if the window is hidden this frame, need repro (#4)
+ - docking: B- resizing a dock tree small currently has glitches (overlapping collapse and close button, etc.)
+ - docking: B- dpi: look at interaction with the hi-dpi and multi-dpi stuff.
+ - docking: B- tab bar: appearing on first frame with a dumb layout would do less harm that not appearing? (when behind dynamic branch) or store titles + render in EndTabBar()
+ - docking: B- tab bar: make selected tab always shows its full title?
+ - docking: B- hide close button on single tab bar?
+ - docking: B- nav: design interactions so nav controls can dock/undock
+ - docking: B- dockspace: flag to lock the dock tree and/or sizes (ImGuiDockNodeFlags_Locked?)
+ - docking: B- reintroduce collapsing a floating dock node. also collapsing a docked dock node!
+ - docking: B- allow dragging a non-floating dock node by clicking on the title-bar-looking section (not just the collapse/menu button)
+ - docking: B- option to remember undocked window size? (instead of keeping their docked size) (relate to #2104)
+ - docking: C- nav: CTRL+TAB highlighting tabs shows the mismatch between focus-stack and tab-order (not visible in VS because it doesn't highlight the tabs)
+ - docking: C- after a dock/undock, the Scrollbar Status update in Begin() should use an updated e.g. size_y_for_scrollbars to avoid a 1 frame scrollbar flicker.
+
+ - tabs: "there is currently a problem because TabItem() will try to submit their own tooltip after 0.50 second, and this will have the effect of making your tooltip flicker once." -> tooltip priority work (WIP branch)
+ - tabs: make EndTabBar fail if users doesn't respect BeginTabBar return value, for consistency/future-proofing.
+ - tabs: persistent order/focus in BeginTabBar() api (#261, #351)
+ - tabs: TabItem could honor SetNextItemWidth()?
+ - tabs: explicit api (even if internal) to cleanly manipulate tab order.
+ - tabs: Mouse wheel over tab bar could scroll? (with shift?) (#2702)
+
+ - image/image button: misalignment on padded/bordered button?
+ - image/image button: parameters are confusing, image() has tint_col,border_col whereas imagebutton() has bg_col/tint_col. Even thou they are different parameters ordering could be more consistent. can we fix that?
+ - image button: not taking an explicit id can be problematic. (#2464, #1390)
+ - slider/drag: ctrl+click when format doesn't include a % character.. disable? display underlying value in default format? (see TempInputTextScalar)
+ - slider: allow using the [-]/[+] buttons used by InputFloat()/InputInt()
+ - slider: initial absolute click is imprecise. change to relative movement slider (same as scrollbar). (#1946)
+ - slider: add dragging-based widgets to edit values with mouse (on 2 axises), saving screen real-estate.
+ - slider: tint background based on value (e.g. v_min -> v_max, or use 0.0f either side of the sign)
+ - slider: relative dragging? + precision dragging
+ - slider: step option (#1183)
+ - slider: style: fill % of the bar instead of positioning a drag.
+ - knob: rotating knob widget (#942)
+ - drag float: support for reversed drags (min > max) (removed is_locked, also see fdc526e)
+ - drag float: up/down axis
+ - drag float: power != 0.0f with current value being outside the range keeps the value stuck.
+ - drag float: added leeway on edge (e.g. a few invisible steps past the clamp limits)
+
+ - combo: use clipper.
+ - combo: flag for BeginCombo to not return true when unchanged (#1182)
+ - combo: a way/helper to customize the combo preview (#1658) -> experimental BeginComboPreview()
+ - combo/listbox: keyboard control. need InputText-like non-active focus + key handling. considering keyboard for custom listbox (pr #203)
+ - listbox: multiple selection (WIP range-select branch)
+ - listbox: unselect option (#1208)
+ - listbox: make it easier/more natural to implement range-select (need some sort of info/ref about the last clicked/focused item that user can translate to an index?) (WIP range-select branch)
+ - listbox: user may want to initial scroll to focus on the one selected value?
+ - listbox: disable capturing mouse wheel if the listbox has no scrolling. (#1681)
+ - listbox: scrolling should track modified selection.
+ - listbox: future api should allow to enable horizontal scrolling (#2510)
+
+!- popups/menus: clarify usage of popups id, how MenuItem/Selectable closing parent popups affects the ID, etc. this is quite fishy needs improvement! (#331, #402)
+ - modals: make modal title bar blink when trying to click outside the modal
+ - modals: technically speaking, we could make Begin() with ImGuiWindowFlags_Modal work without involving popup. May help untangle a few things, as modals are more like regular windows than popups.
+ - popups: if the popup functions took explicit ImGuiID it would allow the user to manage the scope of those ID. (#331)
+ - popups: clicking outside (to close popup) and holding shouldn't drag window below.
+ - popups: add variant using global identifier similar to Begin/End (#402)
+ - popups: border options. richer api like BeginChild() perhaps? (#197)
+ - popups/modals: although it is sometimes convenient that popups/modals lifetime is owned by imgui, we could also a bool-owned-by-user api as long as Begin() return value testing is enforced.
+
+ - tooltip: drag and drop with tooltip near monitor edges lose/changes its last direction instead of locking one. The drag and drop tooltip should always follow without changing direction.
+ - tooltip: allow to set the width of a tooltip to allow TextWrapped() etc. while keeping the height automatic.
+ - tooltip: tooltips with delay timers? or general timer policy? (instantaneous vs timed): IsItemHovered() with timer + implicit aabb-id for items with no ID. (#1485) (WIP branch)
+ - tooltip: drag tooltip hovering over source widget with IsItemHovered/SetTooltip flickers (WIP branch)
+
+ - status-bar: add a per-window status bar helper similar to what menu-bar does. generalize concept of layer0 rect in window (can make _MenuBar window flag obsolete too).
+ - shortcuts: local-style shortcut api, e.g. parse "&Save"
+ - shortcuts,menus: global-style shortcut api e.g. "Save (CTRL+S)" -> explicit flag for recursing into closed menu
+ - shortcuts: programmatically access shortcuts "Focus("&Save"))
+ - menus: menu-bar: main menu-bar could affect clamping of windows position (~ akin to modifying DisplayMin)
+ - menus: hovering from menu to menu on a menu-bar has 1 frame without any menu, which is a little annoying. ideally either 0 either longer.
+ - menus: could merge draw call in most cases (how about storing an optional aabb in ImDrawCmd to move the burden of merging in a single spot).
+ - menus: would be nice if the Selectable() supported horizontal alignment (must be given the equivalent of WorkRect.Max.x matching the position of the shortcut column)
+
+ - tree node: add treenode/treepush int variants? not there because (void*) cast from int warns on some platforms/settings?
+ - tree node: try to apply scrolling at time of TreePop() if node was just opened and end of node is past scrolling limits?
+ - tree node / selectable render mismatch which is visible if you use them both next to each other (e.g. cf. property viewer)
+ - tree node: tweak color scheme to distinguish headers from selected tree node (#581)
+ - tree node: leaf/non-leaf highlight mismatch.
+ - tree node: flag to disable formatting and/or detect "%s"
+ - tree node/opt: could avoid formatting when clipped (flag assuming we don't care about width/height, assume single line height? format only %s/%c to be able to count height?)
+
+ - settings: write more decent code to allow saving/loading new fields: columns, selected tree nodes?
+ - settings: api for per-tool simple persistent data (bool,int,float,columns sizes,etc.) in .ini file (#437)
+ - settings/persistence: helpers to make TreeNodeBehavior persist (even during dev!) - may need to store some semantic and/or data type in ImGuiStoragePair
+
+ - style: better default styles. (#707)
+ - style: PushStyleVar: allow direct access to individual float X/Y elements.
+ - style: add a highlighted text color (for headers, etc.)
+ - style: border types: out-screen, in-screen, etc. (#447)
+ - style: add window shadow (fading away from the window. Paint-style calculation of vertices alpha after drawlist would be easier)
+ - style: a concept of "compact style" that the end-user can easily rely on (e.g. PushStyleCompact()?) that maps to other settings? avoid implementing duplicate helpers such as SmallCheckbox(), etc.
+ - style: try to make PushStyleVar() more robust to incorrect parameters (to be more friendly to edit & continues situation).
+ - style: global scale setting.
+ - style: FramePadding could be different for up vs down (#584)
+ - style: WindowPadding needs to be EVEN as the 0.5 multiplier used on this value probably have a subtle effect on clip rectangle
+ - style: have a more global HSV setter (e.g. alter hue on all elements). consider replacing active/hovered by offset in HSV space? (#438, #707, #1223)
+ - style: gradients fill (#1223) ~ 2 bg colors for each fill? tricky with rounded shapes and using textures for corners.
+ - style editor: color child window height expressed in multiple of line height.
+
+ - log: improve logging of ArrowButton, ListBox, TabItem
+ - log: carry on indent / tree depth when opening a child window
+ - log: enabling log ends up pushing and growing vertices buffers because we don't distinguish layout vs render clipping
+ - log: have more control over the log scope (e.g. stop logging when leaving current tree node scope)
+ - log: be able to log anything (e.g. right-click on a window/tree-node, shows context menu? log into tty/file/clipboard)
+ - log: let user copy any window content to clipboard easily (CTRL+C on windows? while moving it? context menu?). code is commented because it fails with multiple Begin/End pairs.
+ - log: obsolete LogButtons().... (was: LogButtons() options for specifying depth and/or hiding depth slider)
+
+ - filters: set a current filter that certains items (e.g. tree node) can automatically query to hide themselves
+ - filters: handle wild-cards (with implicit leading/trailing *), reg-exprs
+ - filters: fuzzy matches (may use code at blog.forrestthewoods.com/4cffeed33fdb)
+
+ - drag and drop: focus drag target window on hold (even without open)
+ - drag and drop: releasing a drop shows the "..." tooltip for one frame - since e13e598 (#1725)
+ - drag and drop: drag source on a group object (would need e.g. an invisible button covering group in EndGroup) https://twitter.com/paniq/status/1121446364909535233
+ - drag and drop: have some way to know when a drag begin from BeginDragDropSource() pov. (see 2018/01/11 post in #143)
+ - drag and drop: allow preview tooltip to be submitted from a different place than the drag source. (#1725)
+ - drag and drop: allow using with other mouse buttons (where activeid won't be set). (#1637)
+ - drag and drop: make it easier and provide a demo to have tooltip both are source and target site, with a more detailed one on target site (tooltip ordering problem)
+ - drag and drop: demo with reordering nodes (in a list, or a tree node). (#143)
+ - drag and drop: test integrating with os drag and drop (make it easy to do a naive WM_DROPFILE integration)
+ - drag and drop: allow for multiple payload types. (#143)
+ - drag and drop: make payload optional? payload promise? (see 2018/01/11 post in #143)
+ - drag and drop: (#143) "both an in-process pointer and a promise to generate a serialized version, for whether the drag ends inside or outside the same process"
+ - drag and drop: feedback when hovering a region blocked by modal (mouse cursor "NO"?)
+
+ - markup: simple markup language for color change? (#902, #3130)
+
+ - text: selectable text (for copy) as a generic feature (ItemFlags?)
+ - text: proper alignment options in imgui_internal.h
+ - text: provided a framed text helper, e.g. https://pastebin.com/1Laxy8bT
+ - text: refactor TextUnformatted (or underlying function) to more explicitly request if we need width measurement or not
+ - text/layout/tabs: \t pulling position from base pos + step, or offset array (e.g. could be used in text edit, menus for simple icon+text alignment, etc.)
+ - text link/url button: underlined. should api expose an ID or use text contents as ID? which colors enum to use?
+ - text/wrapped: should be a more first-class citizen, e.g. wrapped text within a Selectable with known width.
+ - text/wrapped: custom separator for text wrapping. (#3002)
+ - text/wrapped: figure out better way to use TextWrapped() in an always auto-resize context (tooltip, etc.) (#249)
+
+ - font: arbitrary line spacing. (#2945)
+ - font: MergeMode: flags to select overwriting or not (this is now very easy with refactored ImFontAtlasBuildWithStbTruetype)
+ - font: free the Alpha buffer if user only requested RGBA.
+!- font: better CalcTextSizeA() API, at least for simple use cases. current one is horrible (perhaps have simple vs extended versions).
+ - font: for the purpose of RenderTextEllipsis(), it might be useful that CalcTextSizeA() can ignore the trailing padding?
+ - font: a CalcTextHeight() helper could run faster than CalcTextSize().y
+ - font: enforce monospace through ImFontConfig (for icons?) + create dual ImFont output from same input, reusing rasterized data but with different glyphs/AdvanceX
+ - font: finish CustomRectRegister() to allow mapping Unicode codepoint to custom texture data
+ - font: remove ID from CustomRect registration, it seems unnecessary!
+ - font: make it easier to submit own bitmap font (same texture, another texture?). (#2127, #2575)
+ - font: PushFontSize API (#1018)
+ - font: MemoryTTF taking ownership confusing/not obvious, maybe default should be opposite?
+ - font: storing MinAdvanceX per font would allow us to skip calculating line width (under a threshold of character count) in loops looking for block width
+ - font/demo: add tools to show glyphs used by a text blob, display U16 value, list missing glyphs.
+ - font/demo: demonstrate use of ImFontGlyphRangesBuilder.
+ - font/atlas: add a missing Glyphs.reserve()
+ - font/atlas: incremental updates
+ - font/atlas: dynamic font atlas to avoid baking huge ranges into bitmap and make scaling easier.
+ - font/draw: vertical and/or rotated text renderer (#705) - vertical is easier clipping wise
+ - font/draw: need to be able to specify wrap start position.
+ - font/draw: better reserve policy for large horizontal block of text (shouldn't reserve for all clipped lines). also see #3349.
+ - font/draw: fix for drawing 16k+ visible characters in same call.
+ - font/draw: underline, squiggle line rendering helpers.
+ - font: optimization: for monospace font (like the default one) we can trim IndexXAdvance as long as trailing value is == FallbackXAdvance (need to make sure TAB is still correct), would save on cache line.
+ - font: add support for kerning, probably optional. A) perhaps default to (32..128)^2 matrix ~ 9K entries = 36KB, then hash for non-ascii?. B) or sparse lookup into per-char list?
+ - font: add a simpler CalcTextSizeA() api? current one ok but not welcome if user needs to call it directly (without going through ImGui::CalcTextSize)
+ - font: fix AddRemapChar() to work before atlas  has been built.
+ - font: (api breaking) remove "TTF" from symbol names. also because it now supports OTF.
+ - font/opt: Considering storing standalone AdvanceX table as 16-bit fixed point integer?
+ - font/opt: Glyph currently 40 bytes (2+9*4). Consider storing UV as 16 bits integer? (->32 bytes). X0/Y0/X1/Y1 as 16 fixed-point integers? Or X0/Y0 as float and X1/Y1 as fixed8_8?
+
+ - nav: some features such as PageUp/Down/Home/End should probably work without ImGuiConfigFlags_NavEnableKeyboard? (where do we draw the line? how about CTRL+Tab)
+ ! nav: never clear NavId on some setup (e.g. gamepad centric)
+ - nav: there's currently no way to completely clear focus with the keyboard. depending on patterns used by the application to dispatch inputs, it may be desirable.
+ - nav: code to focus child-window on restoring NavId appears to have issue: e.g. when focus change is implicit because of window closure.
+ - nav: Home/End behavior when navigable item is not fully visible at the edge of scrolling? should be backtrack to keep item into view?
+ - nav: NavScrollToBringItemIntoView() with item bigger than view should focus top-right? Repro: using Nav in "About Window"
+ - nav: wrap around logic to allow e.g. grid based layout (pressing NavRight on the right-most element would go to the next row, etc.). see internal's NavMoveRequestTryWrapping().
+ - nav: patterns to make it possible for arrows key to update selection (see JustMovedTo in range_select branch)
+ - nav: restore/find nearest NavId when current one disappear (e.g. pressed a button that disappear, or perhaps auto restoring when current button change name)
+ - nav: SetItemDefaultFocus() level of priority, so widget like Selectable when inside a popup could claim a low-priority default focus on the first selected iem
+ - nav: NavFlattened: init requests don't work properly on flattened siblings.
+ - nav: NavFlattened: pageup/pagedown/home/end don't work properly on flattened siblings.
+ - nav: NavFlattened: ESC on a flattened child should select something.
+ - nav: NavFlattened: broken: in typical usage scenario, the items of a fully clipped child are currently not considered to enter into a NavFlattened child.
+ - nav: NavFlattened: cannot access menu-bar of a flattened child window with Alt/menu key (not a very common use case..).
+ - nav: simulate right-click or context activation? (SHIFT+F10, keyboard Menu key?)
+ - nav/popup: esc/enter default behavior for popups, e.g. be able to mark an "ok" or "cancel" button that would get triggered by those keys, default validation button, etc.
+ - nav/treenode: left within a tree node block as a fallback (ImGuiTreeNodeFlags_NavLeftJumpsBackHere by default?)
+ - nav/menus: pressing left-right on a vertically clipped menu bar tends to jump to the collapse/close buttons.
+ - nav/menus: allow pressing Menu to leave a sub-menu.
+ - nav/menus: a way to access the main menu bar with Alt? (currently needs CTRL+TAB) or last focused window menu bar?
+ - nav/menus: when using the main menu bar, even though we restore focus after, the underlying window loses its title bar highlight during menu manipulation. could we prevent it?
+ - nav/menus: main menu bar currently cannot restore a NULL focus. Could save NavWindow at the time of being focused, similarly to what popup do?
+ - nav/menus: Alt,Up could open the first menu (e.g. "File") currently it tends to nav into the window/collapse menu. Do do that we would need custom transition?
+ - nav/windowing: configure fade-in/fade-out delay on Ctrl+Tab?
+ - nav/windowing: when CTRL+Tab/windowing is active, the HoveredWindow detection doesn't take account of the window display re-ordering.
+ - nav/windowing: Resizing window will currently fail with certain types of resizing constraints/callback applied
+ - focus: preserve ActiveId/focus stack state, e.g. when opening a menu and close it, previously selected InputText() focus gets restored (#622)
+
+ - viewport: make it possible to have no main/hosting viewport
+ - viewport: We set ImGuiViewportFlags_NoFocusOnAppearing in a way that is required for GLFW/SDL binding, but could be handled better without
+   on a custom e.g. Win32 bindings. It prevents newly dragged-out viewports from taking the focus, which makes ALT+F4 more ambiguous.
+ - viewport: not focusing newly undocked viewport means clicking back on previous one doesn't bring OS window to front.
+ - viewport: with platform decoration enabled, platform may force constraint (e.g. minimum size)
+ - viewport: use getfocus/setfocus api to synchronize imgui<>platform focus better (e.g imgui-side ctrl-tab can focus os window, OS initial setup and alt-tab can focus imgui window etc.)
+ - viewport: store per-viewport/monitor DPI in .ini file so an application reload or main window changing DPI on reload can be properly patched for.
+ - viewport: implicit/fallback Debug window can hog a zombie viewport (harmless, noisy?) > could at least clear out the reference on a per session basis?
+ - viewport: need to clarify how to use GetMousePos() from a user point of view.
+ - platform: glfw: no support for ImGuiBackendFlags_HasMouseHoveredViewport.
+ - platform: sdl: no support for ImGuiBackendFlags_HasMouseHoveredViewport. maybe we could use SDL_GetMouseFocus() / SDL_WINDOW_MOUSE_FOCUS if imgui could fallback on its heuristic when NoInputs is set
+ - platform: sdl: no refresh of monitor/display (SDL doesn't seem to have an event for it).
+ - platform: sdl: multi-viewport + minimized window seems to break mouse wheel events (at least under Win32).
+
+ - inputs: we need an explicit flag about whether the platform window is focused, to be able to distinguish focused key releases vs alt-tabbing all release behaviors.
+ - inputs: support track pad style scrolling & slider edit.
+ - inputs/io: backspace and arrows in the context of a text input could use system repeat rate.
+ - inputs/io: clarify/standardize/expose repeat rate and repeat delays (#1808)
+ - inputs/scrolling: support for smooth scrolling (#2462, #2569)
+
+ - misc: idle: expose "woken up" boolean (set by inputs) and/or animation time (for cursor blink) for backend to be able stop refreshing easily.
+ - misc: idle: if cursor blink if the _only_ visible animation, core imgui could rewrite vertex alpha to avoid CPU pass on ImGui:: calls.
+ - misc: idle: if cursor blink if the _only_ visible animation, could even expose a dirty rectangle that optionally can be leverage by some app to render in a smaller viewport, getting rid of much pixel shading cost.
+ - misc: no way to run a root-most GetID() with ImGui:: api since there's always a Debug window in the stack. (mentioned in #2960)
+ - misc: make the ImGuiCond values linear (non-power-of-two). internal storage for ImGuiWindow can use integers to combine into flags (Why?)
+ - misc: PushItemFlag(): add a flag to disable keyboard capture when used with mouse? (#1682)
+ - misc: use more size_t in public api?
+ - misc: possible compile-time support for string view/range instead of char* would e.g. facilitate usage with Rust (#683, #3038, WIP string_view branch)
+ - misc: possible compile-time support for wchar_t instead of char*?
+
+ - demo: demonstrate using PushStyleVar() in more details.
+ - demo: add vertical separator demo
+ - demo: add virtual scrolling example?
+ - demo: demonstrate Plot offset
+ - demo: window size constraint: square demo is broken when resizing from edges (#1975), would need to rework the callback system to solve this
+
+ - examples: window minimize, maximize (#583)
+ - examples: provide a zero frame-rate/idle example.
+ - examples: dx11/dx12: try to use new swapchain blit models (#2970)
+ - backends: report it better when not able to create texture?
+ - backends: apple: example_apple should be using modern GL3.
+ - backends: glfw: could go idle when minimized? if (glfwGetWindowAttrib(window, GLFW_ICONIFIED)) { glfwWaitEvents(); continue; } // issue: DeltaTime will be super high on resume, perhaps provide a way to let impl know (#440)
+ - backends: opengl: rename imgui_impl_opengl2 to impl_opengl_legacy and imgui_impl_opengl3 to imgui_impl_opengl? (#1900)
+ - backends: opengl: could use a single vertex buffer and glBufferSubData for uploads?
+ - backends: opengl: explicitly disable GL_STENCIL_TEST in bindings.
+ - backends: vulkan: viewport: support for synchronized swapping of multiple swap chains.
+ - backends: bgfx: https://gist.github.com/RichardGale/6e2b74bc42b3005e08397236e4be0fd0
+ - backends: emscriptem: with refactored examples, we could provide a direct imgui_impl_emscripten platform layer (see eg. https://github.com/floooh/sokol-samples/blob/master/html5/imgui-emsc.cc#L42)
+
+ - bindings: ways to use clang ast dump to generate bindings or helpers for bindings? (e.g. clang++ -Xclang -ast-dump=json imgui.h) (WIP project "dear-bindings" still private)
+
+ - optimization: replace vsnprintf with stb_printf? using IMGUI_USE_STB_SPRINTF. (#1038 + needed for string_view)
+ - optimization: add clipping for multi-component widgets (SliderFloatX, ColorEditX, etc.). one problem is that nav branch can't easily clip parent group when there is a move request.
+ - optimization: add a flag to disable most of rendering, for the case where the user expect to skip it (#335)
+ - optimization: fully covered window (covered by another with non-translucent bg + WindowRounding worth of padding) may want to clip rendering.
+ - optimization: use another hash function than crc32, e.g. FNV1a
+ - optimization: turn some the various stack vectors into statically-sized arrays

extern/imgui_patched/imconfig.h

@@ -0,0 +1,125 @@
+//-----------------------------------------------------------------------------
+// COMPILE-TIME OPTIONS FOR DEAR IMGUI
+// Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
+// You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
+//-----------------------------------------------------------------------------
+// A) You may edit imconfig.h (and not overwrite it when updating Dear ImGui, or maintain a patch/rebased branch with your modifications to it)
+// B) or '#define IMGUI_USER_CONFIG "my_imgui_config.h"' in your project and then add directives in your own file without touching this template.
+//-----------------------------------------------------------------------------
+// You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
+// files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
+// Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
+// Call IMGUI_CHECKVERSION() from your .cpp files to verify that the data structures your files are using are matching the ones imgui.cpp is using.
+//-----------------------------------------------------------------------------
+
+#pragma once
+
+//---- Define assertion handler. Defaults to calling assert().
+// If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+//#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
+//#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
+
+//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
+// Using Dear ImGui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
+// DLL users: heaps and globals are not shared across DLL boundaries! You will need to call SetCurrentContext() + SetAllocatorFunctions()
+// for each static/DLL boundary you are calling from. Read "Context and Memory Allocators" section of imgui.cpp for more details.
+//#define IMGUI_API __declspec( dllexport )
+//#define IMGUI_API __declspec( dllimport )
+
+//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
+//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+//#define IMGUI_DISABLE_OBSOLETE_KEYIO                      // 1.87: disable legacy io.KeyMap[]+io.KeysDown[] in favor io.AddKeyEvent(). This will be folded into IMGUI_DISABLE_OBSOLETE_FUNCTIONS in a few versions.
+
+//---- Disable all of Dear ImGui or don't implement standard windows.
+// It is very strongly recommended to NOT disable the demo windows during development. Please read comments in imgui_demo.cpp.
+//#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty.
+//#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty. Not recommended.
+//#define IMGUI_DISABLE_METRICS_WINDOW                      // Disable metrics/debugger and other debug tools: ShowMetricsWindow() and ShowStackToolWindow() will be empty.
+
+//---- Don't implement some functions to reduce linkage requirements.
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc. (user32.lib/.a, kernel32.lib/.a)
+//#define IMGUI_ENABLE_WIN32_DEFAULT_IME_FUNCTIONS          // [Win32] [Default with Visual Studio] Implement default IME handler (require imm32.lib/.a, auto-link for Visual Studio, -limm32 on command-line for MinGW)
+//#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] [Default with non-Visual Studio compilers] Don't implement default IME handler (won't require imm32.lib/.a)
+//#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, ime).
+//#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
+//#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
+//#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
+//#define IMGUI_DISABLE_FILE_FUNCTIONS                      // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle at all (replace them with dummies)
+//#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite and ImFileHandle so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
+//#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+//#define IMGUI_DISABLE_SSE                                 // Disable use of SSE intrinsics even if available
+
+//---- Include imgui_user.h at the end of imgui.h as a convenience
+//#define IMGUI_INCLUDE_IMGUI_USER_H
+
+//---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
+//#define IMGUI_USE_BGRA_PACKED_COLOR
+
+//---- Use 32-bit for ImWchar (default is 16-bit) to support unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
+//#define IMGUI_USE_WCHAR32
+
+//---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
+// By default the embedded implementations are declared static and not available outside of Dear ImGui sources files.
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
+//#define IMGUI_STB_SPRINTF_FILENAME    "my_folder/stb_sprintf.h"    // only used if enabled
+//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+
+//---- Use stb_sprintf.h for a faster implementation of vsnprintf instead of the one from libc (unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined)
+// Compatibility checks of arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by stb_sprintf.h.
+//#define IMGUI_USE_STB_SPRINTF
+
+//---- Use FreeType to build and rasterize the font atlas (instead of stb_truetype which is embedded by default in Dear ImGui)
+// Requires FreeType headers to be available in the include path. Requires program to be compiled with 'misc/freetype/imgui_freetype.cpp' (in this repository) + the FreeType library (not provided).
+// On Windows you may use vcpkg with 'vcpkg install freetype --triplet=x64-windows' + 'vcpkg integrate install'.
+//#define IMGUI_ENABLE_FREETYPE
+
+//---- Use stb_truetype to build and rasterize the font atlas (default)
+// The only purpose of this define is if you want force compilation of the stb_truetype backend ALONG with the FreeType backend.
+//#define IMGUI_ENABLE_STB_TRUETYPE
+
+//---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
+// This will be inlined as part of ImVec2 and ImVec4 class declarations.
+/*
+#define IM_VEC2_CLASS_EXTRA                                                     \
+        constexpr ImVec2(const MyVec2& f) : x(f.x), y(f.y) {}                   \
+        operator MyVec2() const { return MyVec2(x,y); }
+
+#define IM_VEC4_CLASS_EXTRA                                                     \
+        constexpr ImVec4(const MyVec4& f) : x(f.x), y(f.y), z(f.z), w(f.w) {}   \
+        operator MyVec4() const { return MyVec4(x,y,z,w); }
+*/
+
+//---- Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
+// Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
+// Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
+// Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
+//#define ImDrawIdx unsigned int
+
+//---- Override ImDrawCallback signature (will need to modify renderer backends accordingly)
+//struct ImDrawList;
+//struct ImDrawCmd;
+//typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
+//#define ImDrawCallback MyImDrawCallback
+
+//---- Debug Tools: Macro to break in Debugger
+// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
+//#define IM_DEBUG_BREAK  IM_ASSERT(0)
+//#define IM_DEBUG_BREAK  __debugbreak()
+
+//---- Debug Tools: Have the Item Picker break in the ItemAdd() function instead of ItemHoverable(),
+// (which comes earlier in the code, will catch a few extra items, allow picking items other than Hovered one.)
+// This adds a small runtime cost which is why it is not enabled by default.
+//#define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX
+
+//---- Debug Tools: Enable slower asserts
+//#define IMGUI_DEBUG_PARANOID
+
+//---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
+/*
+namespace ImGui
+{
+    void MyFunction(const char* name, const MyMatrix44& v);
+}
+*/

extern/imgui_patched/imstb_rectpack.h

@@ -0,0 +1,627 @@
+// [DEAR IMGUI]
+// This is a slightly modified version of stb_rect_pack.h 1.01.
+// Grep for [DEAR IMGUI] to find the changes.
+// 
+// stb_rect_pack.h - v1.01 - public domain - rectangle packing
+// Sean Barrett 2014
+//
+// Useful for e.g. packing rectangular textures into an atlas.
+// Does not do rotation.
+//
+// Before #including,
+//
+//    #define STB_RECT_PACK_IMPLEMENTATION
+//
+// in the file that you want to have the implementation.
+//
+// Not necessarily the awesomest packing method, but better than
+// the totally naive one in stb_truetype (which is primarily what
+// this is meant to replace).
+//
+// Has only had a few tests run, may have issues.
+//
+// More docs to come.
+//
+// No memory allocations; uses qsort() and assert() from stdlib.
+// Can override those by defining STBRP_SORT and STBRP_ASSERT.
+//
+// This library currently uses the Skyline Bottom-Left algorithm.
+//
+// Please note: better rectangle packers are welcome! Please
+// implement them to the same API, but with a different init
+// function.
+//
+// Credits
+//
+//  Library
+//    Sean Barrett
+//  Minor features
+//    Martins Mozeiko
+//    github:IntellectualKitty
+//
+//  Bugfixes / warning fixes
+//    Jeremy Jaussaud
+//    Fabian Giesen
+//
+// Version history:
+//
+//     1.01  (2021-07-11)  always use large rect mode, expose STBRP__MAXVAL in public section
+//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
+//     0.99  (2019-02-07)  warning fixes
+//     0.11  (2017-03-03)  return packing success/fail result
+//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
+//     0.09  (2016-08-27)  fix compiler warnings
+//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
+//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
+//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
+//     0.05:  added STBRP_ASSERT to allow replacing assert
+//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
+//     0.01:  initial release
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//       INCLUDE SECTION
+//
+
+#ifndef STB_INCLUDE_STB_RECT_PACK_H
+#define STB_INCLUDE_STB_RECT_PACK_H
+
+#define STB_RECT_PACK_VERSION  1
+
+#ifdef STBRP_STATIC
+#define STBRP_DEF static
+#else
+#define STBRP_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct stbrp_context stbrp_context;
+typedef struct stbrp_node    stbrp_node;
+typedef struct stbrp_rect    stbrp_rect;
+
+typedef int            stbrp_coord;
+
+#define STBRP__MAXVAL  0x7fffffff
+// Mostly for internal use, but this is the maximum supported coordinate value.
+
+STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
+// Assign packed locations to rectangles. The rectangles are of type
+// 'stbrp_rect' defined below, stored in the array 'rects', and there
+// are 'num_rects' many of them.
+//
+// Rectangles which are successfully packed have the 'was_packed' flag
+// set to a non-zero value and 'x' and 'y' store the minimum location
+// on each axis (i.e. bottom-left in cartesian coordinates, top-left
+// if you imagine y increasing downwards). Rectangles which do not fit
+// have the 'was_packed' flag set to 0.
+//
+// You should not try to access the 'rects' array from another thread
+// while this function is running, as the function temporarily reorders
+// the array while it executes.
+//
+// To pack into another rectangle, you need to call stbrp_init_target
+// again. To continue packing into the same rectangle, you can call
+// this function again. Calling this multiple times with multiple rect
+// arrays will probably produce worse packing results than calling it
+// a single time with the full rectangle array, but the option is
+// available.
+//
+// The function returns 1 if all of the rectangles were successfully
+// packed and 0 otherwise.
+
+struct stbrp_rect
+{
+   // reserved for your use:
+   int            id;
+
+   // input:
+   stbrp_coord    w, h;
+
+   // output:
+   stbrp_coord    x, y;
+   int            was_packed;  // non-zero if valid packing
+
+}; // 16 bytes, nominally
+
+
+STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
+// Initialize a rectangle packer to:
+//    pack a rectangle that is 'width' by 'height' in dimensions
+//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
+//
+// You must call this function every time you start packing into a new target.
+//
+// There is no "shutdown" function. The 'nodes' memory must stay valid for
+// the following stbrp_pack_rects() call (or calls), but can be freed after
+// the call (or calls) finish.
+//
+// Note: to guarantee best results, either:
+//       1. make sure 'num_nodes' >= 'width'
+//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
+//
+// If you don't do either of the above things, widths will be quantized to multiples
+// of small integers to guarantee the algorithm doesn't run out of temporary storage.
+//
+// If you do #2, then the non-quantized algorithm will be used, but the algorithm
+// may run out of temporary storage and be unable to pack some rectangles.
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
+// Optionally call this function after init but before doing any packing to
+// change the handling of the out-of-temp-memory scenario, described above.
+// If you call init again, this will be reset to the default (false).
+
+
+STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
+// Optionally select which packing heuristic the library should use. Different
+// heuristics will produce better/worse results for different data sets.
+// If you call init again, this will be reset to the default.
+
+enum
+{
+   STBRP_HEURISTIC_Skyline_default=0,
+   STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
+   STBRP_HEURISTIC_Skyline_BF_sortHeight
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// the details of the following structures don't matter to you, but they must
+// be visible so you can handle the memory allocations for them
+
+struct stbrp_node
+{
+   stbrp_coord  x,y;
+   stbrp_node  *next;
+};
+
+struct stbrp_context
+{
+   int width;
+   int height;
+   int align;
+   int init_mode;
+   int heuristic;
+   int num_nodes;
+   stbrp_node *active_head;
+   stbrp_node *free_head;
+   stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION SECTION
+//
+
+#ifdef STB_RECT_PACK_IMPLEMENTATION
+#ifndef STBRP_SORT
+#include <stdlib.h>
+#define STBRP_SORT qsort
+#endif
+
+#ifndef STBRP_ASSERT
+#include <assert.h>
+#define STBRP_ASSERT assert
+#endif
+
+#ifdef _MSC_VER
+#define STBRP__NOTUSED(v)  (void)(v)
+#define STBRP__CDECL       __cdecl
+#else
+#define STBRP__NOTUSED(v)  (void)sizeof(v)
+#define STBRP__CDECL
+#endif
+
+enum
+{
+   STBRP__INIT_skyline = 1
+};
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
+{
+   switch (context->init_mode) {
+      case STBRP__INIT_skyline:
+         STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
+         context->heuristic = heuristic;
+         break;
+      default:
+         STBRP_ASSERT(0);
+   }
+}
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
+{
+   if (allow_out_of_mem)
+      // if it's ok to run out of memory, then don't bother aligning them;
+      // this gives better packing, but may fail due to OOM (even though
+      // the rectangles easily fit). @TODO a smarter approach would be to only
+      // quantize once we've hit OOM, then we could get rid of this parameter.
+      context->align = 1;
+   else {
+      // if it's not ok to run out of memory, then quantize the widths
+      // so that num_nodes is always enough nodes.
+      //
+      // I.e. num_nodes * align >= width
+      //                  align >= width / num_nodes
+      //                  align = ceil(width/num_nodes)
+
+      context->align = (context->width + context->num_nodes-1) / context->num_nodes;
+   }
+}
+
+STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
+{
+   int i;
+
+   for (i=0; i < num_nodes-1; ++i)
+      nodes[i].next = &nodes[i+1];
+   nodes[i].next = NULL;
+   context->init_mode = STBRP__INIT_skyline;
+   context->heuristic = STBRP_HEURISTIC_Skyline_default;
+   context->free_head = &nodes[0];
+   context->active_head = &context->extra[0];
+   context->width = width;
+   context->height = height;
+   context->num_nodes = num_nodes;
+   stbrp_setup_allow_out_of_mem(context, 0);
+
+   // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
+   context->extra[0].x = 0;
+   context->extra[0].y = 0;
+   context->extra[0].next = &context->extra[1];
+   context->extra[1].x = (stbrp_coord) width;
+   context->extra[1].y = (1<<30);
+   context->extra[1].next = NULL;
+}
+
+// find minimum y position if it starts at x1
+static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
+{
+   stbrp_node *node = first;
+   int x1 = x0 + width;
+   int min_y, visited_width, waste_area;
+
+   STBRP__NOTUSED(c);
+
+   STBRP_ASSERT(first->x <= x0);
+
+   #if 0
+   // skip in case we're past the node
+   while (node->next->x <= x0)
+      ++node;
+   #else
+   STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
+   #endif
+
+   STBRP_ASSERT(node->x <= x0);
+
+   min_y = 0;
+   waste_area = 0;
+   visited_width = 0;
+   while (node->x < x1) {
+      if (node->y > min_y) {
+         // raise min_y higher.
+         // we've accounted for all waste up to min_y,
+         // but we'll now add more waste for everything we've visted
+         waste_area += visited_width * (node->y - min_y);
+         min_y = node->y;
+         // the first time through, visited_width might be reduced
+         if (node->x < x0)
+            visited_width += node->next->x - x0;
+         else
+            visited_width += node->next->x - node->x;
+      } else {
+         // add waste area
+         int under_width = node->next->x - node->x;
+         if (under_width + visited_width > width)
+            under_width = width - visited_width;
+         waste_area += under_width * (min_y - node->y);
+         visited_width += under_width;
+      }
+      node = node->next;
+   }
+
+   *pwaste = waste_area;
+   return min_y;
+}
+
+typedef struct
+{
+   int x,y;
+   stbrp_node **prev_link;
+} stbrp__findresult;
+
+static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
+{
+   int best_waste = (1<<30), best_x, best_y = (1 << 30);
+   stbrp__findresult fr;
+   stbrp_node **prev, *node, *tail, **best = NULL;
+
+   // align to multiple of c->align
+   width = (width + c->align - 1);
+   width -= width % c->align;
+   STBRP_ASSERT(width % c->align == 0);
+
+   // if it can't possibly fit, bail immediately
+   if (width > c->width || height > c->height) {
+      fr.prev_link = NULL;
+      fr.x = fr.y = 0;
+      return fr;
+   }
+
+   node = c->active_head;
+   prev = &c->active_head;
+   while (node->x + width <= c->width) {
+      int y,waste;
+      y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
+      if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
+         // bottom left
+         if (y < best_y) {
+            best_y = y;
+            best = prev;
+         }
+      } else {
+         // best-fit
+         if (y + height <= c->height) {
+            // can only use it if it first vertically
+            if (y < best_y || (y == best_y && waste < best_waste)) {
+               best_y = y;
+               best_waste = waste;
+               best = prev;
+            }
+         }
+      }
+      prev = &node->next;
+      node = node->next;
+   }
+
+   best_x = (best == NULL) ? 0 : (*best)->x;
+
+   // if doing best-fit (BF), we also have to try aligning right edge to each node position
+   //
+   // e.g, if fitting
+   //
+   //     ____________________
+   //    |____________________|
+   //
+   //            into
+   //
+   //   |                         |
+   //   |             ____________|
+   //   |____________|
+   //
+   // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
+   //
+   // This makes BF take about 2x the time
+
+   if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
+      tail = c->active_head;
+      node = c->active_head;
+      prev = &c->active_head;
+      // find first node that's admissible
+      while (tail->x < width)
+         tail = tail->next;
+      while (tail) {
+         int xpos = tail->x - width;
+         int y,waste;
+         STBRP_ASSERT(xpos >= 0);
+         // find the left position that matches this
+         while (node->next->x <= xpos) {
+            prev = &node->next;
+            node = node->next;
+         }
+         STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
+         y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
+         if (y + height <= c->height) {
+            if (y <= best_y) {
+               if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
+                  best_x = xpos;
+                  //STBRP_ASSERT(y <= best_y); [DEAR IMGUI]
+                  best_y = y;
+                  best_waste = waste;
+                  best = prev;
+               }
+            }
+         }
+         tail = tail->next;
+      }
+   }
+
+   fr.prev_link = best;
+   fr.x = best_x;
+   fr.y = best_y;
+   return fr;
+}
+
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
+{
+   // find best position according to heuristic
+   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
+   stbrp_node *node, *cur;
+
+   // bail if:
+   //    1. it failed
+   //    2. the best node doesn't fit (we don't always check this)
+   //    3. we're out of memory
+   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
+      res.prev_link = NULL;
+      return res;
+   }
+
+   // on success, create new node
+   node = context->free_head;
+   node->x = (stbrp_coord) res.x;
+   node->y = (stbrp_coord) (res.y + height);
+
+   context->free_head = node->next;
+
+   // insert the new node into the right starting point, and
+   // let 'cur' point to the remaining nodes needing to be
+   // stiched back in
+
+   cur = *res.prev_link;
+   if (cur->x < res.x) {
+      // preserve the existing one, so start testing with the next one
+      stbrp_node *next = cur->next;
+      cur->next = node;
+      cur = next;
+   } else {
+      *res.prev_link = node;
+   }
+
+   // from here, traverse cur and free the nodes, until we get to one
+   // that shouldn't be freed
+   while (cur->next && cur->next->x <= res.x + width) {
+      stbrp_node *next = cur->next;
+      // move the current node to the free list
+      cur->next = context->free_head;
+      context->free_head = cur;
+      cur = next;
+   }
+
+   // stitch the list back in
+   node->next = cur;
+
+   if (cur->x < res.x + width)
+      cur->x = (stbrp_coord) (res.x + width);
+
+#ifdef _DEBUG
+   cur = context->active_head;
+   while (cur->x < context->width) {
+      STBRP_ASSERT(cur->x < cur->next->x);
+      cur = cur->next;
+   }
+   STBRP_ASSERT(cur->next == NULL);
+
+   {
+      int count=0;
+      cur = context->active_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      cur = context->free_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      STBRP_ASSERT(count == context->num_nodes+2);
+   }
+#endif
+
+   return res;
+}
+
+static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   if (p->h > q->h)
+      return -1;
+   if (p->h < q->h)
+      return  1;
+   return (p->w > q->w) ? -1 : (p->w < q->w);
+}
+
+static int STBRP__CDECL rect_original_order(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
+}
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
+{
+   int i, all_rects_packed = 1;
+
+   // we use the 'was_packed' field internally to allow sorting/unsorting
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = i;
+   }
+
+   // sort according to heuristic
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
+
+   for (i=0; i < num_rects; ++i) {
+      if (rects[i].w == 0 || rects[i].h == 0) {
+         rects[i].x = rects[i].y = 0;  // empty rect needs no space
+      } else {
+         stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
+         if (fr.prev_link) {
+            rects[i].x = (stbrp_coord) fr.x;
+            rects[i].y = (stbrp_coord) fr.y;
+         } else {
+            rects[i].x = rects[i].y = STBRP__MAXVAL;
+         }
+      }
+   }
+
+   // unsort
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
+
+   // set was_packed flags and all_rects_packed status
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
+      if (!rects[i].was_packed)
+         all_rects_packed = 0;
+   }
+
+   // return the all_rects_packed status
+   return all_rects_packed;
+}
+#endif
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

extern/imgui_patched/misc/README.txt

@@ -0,0 +1,24 @@
+
+misc/cpp/
+  InputText() wrappers for C++ standard library (STL) type: std::string.
+  This is also an example of how you may wrap your own similar types.
+
+misc/debuggers/
+  Helper files for popular debuggers.
+  With the .natvis file, types like ImVector<> will be displayed nicely in Visual Studio debugger.
+
+misc/fonts/
+  Fonts loading/merging instructions (e.g. How to handle glyph ranges, how to merge icons fonts).
+  Command line tool "binary_to_compressed_c" to create compressed arrays to embed data in source code.
+  Suggested fonts and links.
+  These suggested fonts have been removed to save space.
+
+misc/freetype/
+  Font atlas builder/rasterizer using FreeType instead of stb_truetype.
+  Benefit from better FreeType rasterization, in particular for small fonts.
+
+misc/single_file/
+  Single-file header stub.
+  We use this to validate compiling all *.cpp files in a same compilation unit.
+  Users of that technique (also called "Unity builds") can generally provide this themselves,
+  so we don't really recommend you use this in your projects.

extern/imgui_patched/misc/cpp/README.txt

@@ -0,0 +1,13 @@
+
+imgui_stdlib.h + imgui_stdlib.cpp
+  InputText() wrappers for C++ standard library (STL) type: std::string.
+  This is also an example of how you may wrap your own similar types.
+
+imgui_scoped.h
+  [Experimental, not currently in main repository]
+  Additional header file with some RAII-style wrappers for common Dear ImGui functions.
+  Try by merging: https://github.com/ocornut/imgui/pull/2197
+  Discuss at: https://github.com/ocornut/imgui/issues/2096
+
+See more C++ related extension on Wiki
+  https://github.com/ocornut/imgui/wiki/Useful-Extensions#cness

extern/imgui_patched/misc/cpp/imgui_stdlib.cpp

@@ -0,0 +1,72 @@
+// dear imgui: wrappers for C++ standard library (STL) types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+// Changelog:
+// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
+
+#include "imgui.h"
+#include "imgui_stdlib.h"
+
+struct InputTextCallback_UserData
+{
+    std::string*            Str;
+    ImGuiInputTextCallback  ChainCallback;
+    void*                   ChainCallbackUserData;
+};
+
+static int InputTextCallback(ImGuiInputTextCallbackData* data)
+{
+    InputTextCallback_UserData* user_data = (InputTextCallback_UserData*)data->UserData;
+    if (data->EventFlag == ImGuiInputTextFlags_CallbackResize)
+    {
+        // Resize string callback
+        // If for some reason we refuse the new length (BufTextLen) and/or capacity (BufSize) we need to set them back to what we want.
+        std::string* str = user_data->Str;
+        IM_ASSERT(data->Buf == str->c_str());
+        str->resize(data->BufTextLen);
+        data->Buf = (char*)str->c_str();
+    }
+    else if (user_data->ChainCallback)
+    {
+        // Forward to user callback, if any
+        data->UserData = user_data->ChainCallbackUserData;
+        return user_data->ChainCallback(data);
+    }
+    return 0;
+}
+
+bool ImGui::InputText(const char* label, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputText(label, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
+}
+
+bool ImGui::InputTextMultiline(const char* label, std::string* str, const ImVec2& size, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputTextMultiline(label, (char*)str->c_str(), str->capacity() + 1, size, flags, InputTextCallback, &cb_user_data);
+}
+
+bool ImGui::InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags, ImGuiInputTextCallback callback, void* user_data)
+{
+    IM_ASSERT((flags & ImGuiInputTextFlags_CallbackResize) == 0);
+    flags |= ImGuiInputTextFlags_CallbackResize;
+
+    InputTextCallback_UserData cb_user_data;
+    cb_user_data.Str = str;
+    cb_user_data.ChainCallback = callback;
+    cb_user_data.ChainCallbackUserData = user_data;
+    return InputTextWithHint(label, hint, (char*)str->c_str(), str->capacity() + 1, flags, InputTextCallback, &cb_user_data);
+}

extern/imgui_patched/misc/cpp/imgui_stdlib.h

@@ -0,0 +1,18 @@
+// dear imgui: wrappers for C++ standard library (STL) types (std::string, etc.)
+// This is also an example of how you may wrap your own similar types.
+
+// Changelog:
+// - v0.10: Initial version. Added InputText() / InputTextMultiline() calls with std::string
+
+#pragma once
+
+#include <string>
+
+namespace ImGui
+{
+    // ImGui::InputText() with std::string
+    // Because text input needs dynamic resizing, we need to setup a callback to grow the capacity
+    IMGUI_API bool  InputText(const char* label, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputTextMultiline(const char* label, std::string* str, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+}

extern/imgui_patched/misc/debuggers/README.txt

@@ -0,0 +1,16 @@
+
+HELPER FILES FOR POPULAR DEBUGGERS
+
+imgui.gdb
+    GDB: disable stepping into trivial functions.
+    (read comments inside file for details)
+
+imgui.natstepfilter
+    Visual Studio Debugger: disable stepping into trivial functions.
+    (read comments inside file for details)
+
+imgui.natvis
+    Visual Studio Debugger: describe Dear ImGui types for better display.
+    With this, types like ImVector<> will be displayed nicely in the debugger.
+    (read comments inside file for details)
+

extern/imgui_patched/misc/debuggers/imgui.gdb

@@ -0,0 +1,12 @@
+# GDB configuration to aid debugging experience
+
+# To enable these customizations edit $HOME/.gdbinit (or ./.gdbinit if local gdbinit is enabled) and add:
+#   add-auto-load-safe-path /path/to/imgui.gdb
+#   source /path/to/imgui.gdb
+#
+# More Information at:
+#   * https://sourceware.org/gdb/current/onlinedocs/gdb/gdbinit-man.html
+#   * https://sourceware.org/gdb/current/onlinedocs/gdb/Init-File-in-the-Current-Directory.html#Init-File-in-the-Current-Directory
+
+# Disable stepping into trivial functions
+skip -rfunction Im(Vec2|Vec4|Strv|Vector|Span)::.+

extern/imgui_patched/misc/debuggers/imgui.natstepfilter

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+.natstepfilter file for Visual Studio debugger.
+Purpose: instruct debugger to skip some functions when using StepInto (F11)
+
+To enable:
+* copy in %USERPROFILE%\Documents\Visual Studio XXXX\Visualizers (current user)
+* or copy in %VsInstallDirectory%\Common7\Packages\Debugger\Visualizers (all users)
+If you have multiple VS version installed, the version that matters is the one you are using the IDE/debugger of (not the compiling toolset).
+This is supported since Visual Studio 2012.
+
+Unfortunately, unlike .natvis files, it isn't yet possible to include this file in your project :(
+You may upvote this: https://developercommunity.visualstudio.com/t/allow-natstepfilter-and-natjmc-to-be-included-as-p/561718
+
+More information at: https://docs.microsoft.com/en-us/visualstudio/debugger/just-my-code?view=vs-2019#BKMK_C___Just_My_Code
+-->
+
+<StepFilter xmlns="http://schemas.microsoft.com/vstudio/debugger/natstepfilter/2010">
+
+    <!-- Disable stepping into trivial functions -->
+    <Function>
+        <Name>(ImVec2|ImVec4|ImStrv)::.+</Name>
+        <Action>NoStepInto</Action>
+    </Function>
+    <Function>
+        <Name>(ImVector|ImSpan).*::operator.+</Name>
+        <Action>NoStepInto</Action>
+    </Function>
+
+</StepFilter>

extern/imgui_patched/misc/debuggers/imgui.natvis

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+.natvis file for Visual Studio debugger.
+Purpose: provide nicer views on data types used by Dear ImGui.
+
+To enable:
+* include file in your VS project (most recommended: not intrusive and always kept up to date!)
+* or copy in %USERPROFILE%\Documents\Visual Studio XXXX\Visualizers (current user)
+* or copy in %VsInstallDirectory%\Common7\Packages\Debugger\Visualizers (all users)
+
+More information at: https://docs.microsoft.com/en-us/visualstudio/debugger/create-custom-views-of-native-objects?view=vs-2019
+-->
+
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+
+<Type Name="ImVector&lt;*&gt;">
+  <DisplayString>{{Size={Size} Capacity={Capacity}}}</DisplayString>
+  <Expand>
+    <ArrayItems>
+      <Size>Size</Size>
+      <ValuePointer>Data</ValuePointer>
+    </ArrayItems>
+  </Expand>
+</Type>
+
+<Type Name="ImSpan&lt;*&gt;">
+  <DisplayString>{{Size={DataEnd-Data} }}</DisplayString>
+  <Expand>
+    <ArrayItems>
+      <Size>DataEnd-Data</Size>
+      <ValuePointer>Data</ValuePointer>
+    </ArrayItems>
+  </Expand>
+</Type>
+
+<Type Name="ImVec2">
+  <DisplayString>{{x={x,g} y={y,g}}}</DisplayString>
+</Type>
+
+<Type Name="ImVec4">
+  <DisplayString>{{x={x,g} y={y,g} z={z,g} w={w,g}}}</DisplayString>
+</Type>
+
+<Type Name="ImRect">
+  <DisplayString>{{Min=({Min.x,g} {Min.y,g}) Max=({Max.x,g} {Max.y,g}) Size=({Max.x-Min.x,g} {Max.y-Min.y,g})}}</DisplayString>
+  <Expand>
+    <Item Name="Min">Min</Item>
+    <Item Name="Max">Max</Item>
+    <Item Name="[Width]">Max.x - Min.x</Item>
+    <Item Name="[Height]">Max.y - Min.y</Item>
+  </Expand>
+</Type>
+
+<Type Name="ImGuiWindow">
+  <DisplayString>{{Name {Name,s} Active {(Active||WasActive)?1:0,d} Child {(Flags &amp; 0x01000000)?1:0,d} Popup {(Flags &amp; 0x04000000)?1:0,d} Hidden {(Hidden)?1:0,d}}</DisplayString>
+</Type>
+
+<Type Name="ImGuiDockNode">
+  <DisplayString>{{ID {ID,x} Pos=({Pos.x,g} {Pos.y,g}) Size=({Size.x,g} {Size.y,g}) Parent {(ParentNode==0)?0:ParentNode->ID,x} Childs {(ChildNodes[0] != 0)+(ChildNodes[1] != 0)} Windows {Windows.Size}  }</DisplayString>
+</Type>
+
+</AutoVisualizer>

extern/imgui_patched/misc/fonts/binary_to_compressed_c.cpp

@@ -0,0 +1,388 @@
+// dear imgui
+// (binary_to_compressed_c.cpp)
+// Helper tool to turn a file into a C array, if you want to embed font data in your source code.
+
+// The data is first compressed with stb_compress() to reduce source code size,
+// then encoded in Base85 to fit in a string so we can fit roughly 4 bytes of compressed data into 5 bytes of source code (suggested by @mmalex)
+// (If we used 32-bit constants it would require take 11 bytes of source code to encode 4 bytes, and be endianness dependent)
+// Note that even with compression, the output array is likely to be bigger than the binary file..
+// Load compressed TTF fonts with ImGui::GetIO().Fonts->AddFontFromMemoryCompressedTTF()
+
+// Build with, e.g:
+//   # cl.exe binary_to_compressed_c.cpp
+//   # g++ binary_to_compressed_c.cpp
+//   # clang++ binary_to_compressed_c.cpp
+// You can also find a precompiled Windows binary in the binary/demo package available from https://github.com/ocornut/imgui
+
+// Usage:
+//   binary_to_compressed_c.exe [-base85] [-nocompress] [-nostatic] <inputfile> <symbolname>
+// Usage example:
+//   # binary_to_compressed_c.exe myfont.ttf MyFont > myfont.cpp
+//   # binary_to_compressed_c.exe -base85 myfont.ttf MyFont > myfont.cpp
+
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+// stb_compress* from stb.h - declaration
+typedef unsigned int stb_uint;
+typedef unsigned char stb_uchar;
+stb_uint stb_compress(stb_uchar* out, stb_uchar* in, stb_uint len);
+
+static bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression, bool use_static);
+
+int main(int argc, char** argv)
+{
+    if (argc < 3)
+    {
+        printf("Syntax: %s [-base85] [-nocompress] [-nostatic] <inputfile> <symbolname>\n", argv[0]);
+        return 0;
+    }
+
+    int argn = 1;
+    bool use_base85_encoding = false;
+    bool use_compression = true;
+    bool use_static = true;
+    while (argn < (argc - 2) && argv[argn][0] == '-')
+    {
+        if (strcmp(argv[argn], "-base85") == 0) { use_base85_encoding = true; argn++; }
+        else if (strcmp(argv[argn], "-nocompress") == 0) { use_compression = false; argn++; }
+        else if (strcmp(argv[argn], "-nostatic") == 0) { use_static = false; argn++; }
+        else
+        {
+            fprintf(stderr, "Unknown argument: '%s'\n", argv[argn]);
+            return 1;
+        }
+    }
+
+    bool ret = binary_to_compressed_c(argv[argn], argv[argn + 1], use_base85_encoding, use_compression, use_static);
+    if (!ret)
+        fprintf(stderr, "Error opening or reading file: '%s'\n", argv[argn]);
+    return ret ? 0 : 1;
+}
+
+char Encode85Byte(unsigned int x)
+{
+    x = (x % 85) + 35;
+    return (x >= '\\') ? x + 1 : x;
+}
+
+bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression, bool use_static)
+{
+    // Read file
+    FILE* f = fopen(filename, "rb");
+    if (!f) return false;
+    int data_sz;
+    if (fseek(f, 0, SEEK_END) || (data_sz = (int)ftell(f)) == -1 || fseek(f, 0, SEEK_SET)) { fclose(f); return false; }
+    char* data = new char[data_sz + 4];
+    if (fread(data, 1, data_sz, f) != (size_t)data_sz) { fclose(f); delete[] data; return false; }
+    memset((void*)(((char*)data) + data_sz), 0, 4);
+    fclose(f);
+
+    // Compress
+    int maxlen = data_sz + 512 + (data_sz >> 2) + sizeof(int); // total guess
+    char* compressed = use_compression ? new char[maxlen] : data;
+    int compressed_sz = use_compression ? stb_compress((stb_uchar*)compressed, (stb_uchar*)data, data_sz) : data_sz;
+    if (use_compression)
+        memset(compressed + compressed_sz, 0, maxlen - compressed_sz);
+
+    // Output as Base85 encoded
+    FILE* out = stdout;
+    fprintf(out, "// File: '%s' (%d bytes)\n", filename, (int)data_sz);
+    fprintf(out, "// Exported using binary_to_compressed_c.cpp\n");
+    const char* static_str = use_static ? "static " : "";
+    const char* compressed_str = use_compression ? "compressed_" : "";
+    if (use_base85_encoding)
+    {
+        fprintf(out, "%sconst char %s_%sdata_base85[%d+1] =\n    \"", static_str, symbol, compressed_str, (int)((compressed_sz + 3) / 4)*5);
+        char prev_c = 0;
+        for (int src_i = 0; src_i < compressed_sz; src_i += 4)
+        {
+            // This is made a little more complicated by the fact that ??X sequences are interpreted as trigraphs by old C/C++ compilers. So we need to escape pairs of ??.
+            unsigned int d = *(unsigned int*)(compressed + src_i);
+            for (unsigned int n5 = 0; n5 < 5; n5++, d /= 85)
+            {
+                char c = Encode85Byte(d);
+                fprintf(out, (c == '?' && prev_c == '?') ? "\\%c" : "%c", c);
+                prev_c = c;
+            }
+            if ((src_i % 112) == 112 - 4)
+                fprintf(out, "\"\n    \"");
+        }
+        fprintf(out, "\";\n\n");
+    }
+    else
+    {
+        fprintf(out, "%sconst unsigned int %s_%ssize = %d;\n", static_str, symbol, compressed_str, (int)compressed_sz);
+        fprintf(out, "%sconst unsigned int %s_%sdata[%d/4] =\n{", static_str, symbol, compressed_str, (int)((compressed_sz + 3) / 4)*4);
+        int column = 0;
+        for (int i = 0; i < compressed_sz; i += 4)
+        {
+            unsigned int d = *(unsigned int*)(compressed + i);
+            if ((column++ % 12) == 0)
+                fprintf(out, "\n    0x%08x, ", d);
+            else
+                fprintf(out, "0x%08x, ", d);
+        }
+        fprintf(out, "\n};\n\n");
+    }
+
+    // Cleanup
+    delete[] data;
+    if (use_compression)
+        delete[] compressed;
+    return true;
+}
+
+// stb_compress* from stb.h - definition
+
+////////////////////           compressor         ///////////////////////
+
+static stb_uint stb_adler32(stb_uint adler32, stb_uchar *buffer, stb_uint buflen)
+{
+    const unsigned long ADLER_MOD = 65521;
+    unsigned long s1 = adler32 & 0xffff, s2 = adler32 >> 16;
+    unsigned long blocklen, i;
+
+    blocklen = buflen % 5552;
+    while (buflen) {
+        for (i=0; i + 7 < blocklen; i += 8) {
+            s1 += buffer[0], s2 += s1;
+            s1 += buffer[1], s2 += s1;
+            s1 += buffer[2], s2 += s1;
+            s1 += buffer[3], s2 += s1;
+            s1 += buffer[4], s2 += s1;
+            s1 += buffer[5], s2 += s1;
+            s1 += buffer[6], s2 += s1;
+            s1 += buffer[7], s2 += s1;
+
+            buffer += 8;
+        }
+
+        for (; i < blocklen; ++i)
+            s1 += *buffer++, s2 += s1;
+
+        s1 %= ADLER_MOD, s2 %= ADLER_MOD;
+        buflen -= blocklen;
+        blocklen = 5552;
+    }
+    return (s2 << 16) + s1;
+}
+
+static unsigned int stb_matchlen(stb_uchar *m1, stb_uchar *m2, stb_uint maxlen)
+{
+    stb_uint i;
+    for (i=0; i < maxlen; ++i)
+        if (m1[i] != m2[i]) return i;
+    return i;
+}
+
+// simple implementation that just takes the source data in a big block
+
+static stb_uchar *stb__out;
+static FILE      *stb__outfile;
+static stb_uint   stb__outbytes;
+
+static void stb__write(unsigned char v)
+{
+    fputc(v, stb__outfile);
+    ++stb__outbytes;
+}
+
+//#define stb_out(v)    (stb__out ? *stb__out++ = (stb_uchar) (v) : stb__write((stb_uchar) (v)))
+#define stb_out(v)    do { if (stb__out) *stb__out++ = (stb_uchar) (v); else stb__write((stb_uchar) (v)); } while (0)
+
+static void stb_out2(stb_uint v) { stb_out(v >> 8); stb_out(v); }
+static void stb_out3(stb_uint v) { stb_out(v >> 16); stb_out(v >> 8); stb_out(v); }
+static void stb_out4(stb_uint v) { stb_out(v >> 24); stb_out(v >> 16); stb_out(v >> 8 ); stb_out(v); }
+
+static void outliterals(stb_uchar *in, int numlit)
+{
+    while (numlit > 65536) {
+        outliterals(in,65536);
+        in     += 65536;
+        numlit -= 65536;
+    }
+
+    if      (numlit ==     0)    ;
+    else if (numlit <=    32)    stb_out (0x000020 + numlit-1);
+    else if (numlit <=  2048)    stb_out2(0x000800 + numlit-1);
+    else /*  numlit <= 65536) */ stb_out3(0x070000 + numlit-1);
+
+    if (stb__out) {
+        memcpy(stb__out,in,numlit);
+        stb__out += numlit;
+    } else
+        fwrite(in, 1, numlit, stb__outfile);
+}
+
+static int stb__window = 0x40000; // 256K
+
+static int stb_not_crap(int best, int dist)
+{
+    return   ((best > 2  &&  dist <= 0x00100)
+        || (best > 5  &&  dist <= 0x04000)
+        || (best > 7  &&  dist <= 0x80000));
+}
+
+static  stb_uint stb__hashsize = 32768;
+
+// note that you can play with the hashing functions all you
+// want without needing to change the decompressor
+#define stb__hc(q,h,c)      (((h) << 7) + ((h) >> 25) + q[c])
+#define stb__hc2(q,h,c,d)   (((h) << 14) + ((h) >> 18) + (q[c] << 7) + q[d])
+#define stb__hc3(q,c,d,e)   ((q[c] << 14) + (q[d] << 7) + q[e])
+
+static unsigned int stb__running_adler;
+
+static int stb_compress_chunk(stb_uchar *history,
+    stb_uchar *start,
+    stb_uchar *end,
+    int length,
+    int *pending_literals,
+    stb_uchar **chash,
+    stb_uint mask)
+{
+    (void)history;
+    int window = stb__window;
+    stb_uint match_max;
+    stb_uchar *lit_start = start - *pending_literals;
+    stb_uchar *q = start;
+
+#define STB__SCRAMBLE(h)   (((h) + ((h) >> 16)) & mask)
+
+    // stop short of the end so we don't scan off the end doing
+    // the hashing; this means we won't compress the last few bytes
+    // unless they were part of something longer
+    while (q < start+length && q+12 < end) {
+        int m;
+        stb_uint h1,h2,h3,h4, h;
+        stb_uchar *t;
+        int best = 2, dist=0;
+
+        if (q+65536 > end)
+            match_max = end-q;
+        else
+            match_max = 65536;
+
+#define stb__nc(b,d)  ((d) <= window && ((b) > 9 || stb_not_crap(b,d)))
+
+#define STB__TRY(t,p)  /* avoid retrying a match we already tried */ \
+    if (p ? dist != q-t : 1)                             \
+    if ((m = stb_matchlen(t, q, match_max)) > best)     \
+    if (stb__nc(m,q-(t)))                                \
+    best = m, dist = q - (t)
+
+        // rather than search for all matches, only try 4 candidate locations,
+        // chosen based on 4 different hash functions of different lengths.
+        // this strategy is inspired by LZO; hashing is unrolled here using the
+        // 'hc' macro
+        h = stb__hc3(q,0, 1, 2); h1 = STB__SCRAMBLE(h);
+        t = chash[h1]; if (t) STB__TRY(t,0);
+        h = stb__hc2(q,h, 3, 4); h2 = STB__SCRAMBLE(h);
+        h = stb__hc2(q,h, 5, 6);        t = chash[h2]; if (t) STB__TRY(t,1);
+        h = stb__hc2(q,h, 7, 8); h3 = STB__SCRAMBLE(h);
+        h = stb__hc2(q,h, 9,10);        t = chash[h3]; if (t) STB__TRY(t,1);
+        h = stb__hc2(q,h,11,12); h4 = STB__SCRAMBLE(h);
+        t = chash[h4]; if (t) STB__TRY(t,1);
+
+        // because we use a shared hash table, can only update it
+        // _after_ we've probed all of them
+        chash[h1] = chash[h2] = chash[h3] = chash[h4] = q;
+
+        if (best > 2)
+            assert(dist > 0);
+
+        // see if our best match qualifies
+        if (best < 3) { // fast path literals
+            ++q;
+        } else if (best > 2  &&  best <= 0x80    &&  dist <= 0x100) {
+            outliterals(lit_start, q-lit_start); lit_start = (q += best);
+            stb_out(0x80 + best-1);
+            stb_out(dist-1);
+        } else if (best > 5  &&  best <= 0x100   &&  dist <= 0x4000) {
+            outliterals(lit_start, q-lit_start); lit_start = (q += best);
+            stb_out2(0x4000 + dist-1);
+            stb_out(best-1);
+        } else if (best > 7  &&  best <= 0x100   &&  dist <= 0x80000) {
+            outliterals(lit_start, q-lit_start); lit_start = (q += best);
+            stb_out3(0x180000 + dist-1);
+            stb_out(best-1);
+        } else if (best > 8  &&  best <= 0x10000 &&  dist <= 0x80000) {
+            outliterals(lit_start, q-lit_start); lit_start = (q += best);
+            stb_out3(0x100000 + dist-1);
+            stb_out2(best-1);
+        } else if (best > 9                      &&  dist <= 0x1000000) {
+            if (best > 65536) best = 65536;
+            outliterals(lit_start, q-lit_start); lit_start = (q += best);
+            if (best <= 0x100) {
+                stb_out(0x06);
+                stb_out3(dist-1);
+                stb_out(best-1);
+            } else {
+                stb_out(0x04);
+                stb_out3(dist-1);
+                stb_out2(best-1);
+            }
+        } else {  // fallback literals if no match was a balanced tradeoff
+            ++q;
+        }
+    }
+
+    // if we didn't get all the way, add the rest to literals
+    if (q-start < length)
+        q = start+length;
+
+    // the literals are everything from lit_start to q
+    *pending_literals = (q - lit_start);
+
+    stb__running_adler = stb_adler32(stb__running_adler, start, q - start);
+    return q - start;
+}
+
+static int stb_compress_inner(stb_uchar *input, stb_uint length)
+{
+    int literals = 0;
+    stb_uint len,i;
+
+    stb_uchar **chash;
+    chash = (stb_uchar**) malloc(stb__hashsize * sizeof(stb_uchar*));
+    if (chash == NULL) return 0; // failure
+    for (i=0; i < stb__hashsize; ++i)
+        chash[i] = NULL;
+
+    // stream signature
+    stb_out(0x57); stb_out(0xbc);
+    stb_out2(0);
+
+    stb_out4(0);       // 64-bit length requires 32-bit leading 0
+    stb_out4(length);
+    stb_out4(stb__window);
+
+    stb__running_adler = 1;
+
+    len = stb_compress_chunk(input, input, input+length, length, &literals, chash, stb__hashsize-1);
+    assert(len == length);
+
+    outliterals(input+length - literals, literals);
+
+    free(chash);
+
+    stb_out2(0x05fa); // end opcode
+
+    stb_out4(stb__running_adler);
+
+    return 1; // success
+}
+
+stb_uint stb_compress(stb_uchar *out, stb_uchar *input, stb_uint length)
+{
+    stb__out = out;
+    stb__outfile = NULL;
+
+    stb_compress_inner(input, length);
+
+    return stb__out - out;
+}

extern/imgui_patched/misc/freetype/README.md

@@ -0,0 +1,37 @@
+# imgui_freetype
+
+Build font atlases using FreeType instead of stb_truetype (which is the default font rasterizer).
+<br>by @vuhdo, @mikesart, @ocornut.
+
+### Usage
+
+1. Get latest FreeType binaries or build yourself (under Windows you may use vcpkg with `vcpkg install freetype --triplet=x64-windows`, `vcpkg integrate install`).
+2. Add imgui_freetype.h/cpp alongside your project files.
+3. Add `#define IMGUI_ENABLE_FREETYPE` in your [imconfig.h](https://github.com/ocornut/imgui/blob/master/imconfig.h) file
+
+### About Gamma Correct Blending
+
+FreeType assumes blending in linear space rather than gamma space.
+See FreeType note for [FT_Render_Glyph](https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Glyph).
+For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
+The default Dear ImGui styles will be impacted by this change (alpha values will need tweaking).
+
+### Testbed for toying with settings (for developers)
+
+See https://gist.github.com/ocornut/b3a9ecf13502fd818799a452969649ad
+
+### Known issues
+
+- Oversampling settins are ignored but also not so much necessary with the higher quality rendering.
+
+### Comparaison
+
+Small, thin anti-aliased fonts typically benefit a lot from FreeType's hinting:
+![comparing_font_rasterizers](https://user-images.githubusercontent.com/8225057/107550178-fef87f00-6bd0-11eb-8d09-e2edb2f0ccfc.gif)
+
+### Colorful glyphs/emojis
+
+You can use the `ImGuiFreeTypeBuilderFlags_LoadColor` flag to load certain colorful glyphs. See the
+["Using Colorful Glyphs/Emojis"](https://github.com/ocornut/imgui/blob/master/docs/FONTS.md#using-colorful-glyphsemojis) section of FONTS.md.
+
+![colored glyphs](https://user-images.githubusercontent.com/8225057/106171241-9dc4ba80-6191-11eb-8a69-ca1467b206d1.png)

extern/imgui_patched/misc/freetype/imgui_freetype.cpp

@@ -0,0 +1,779 @@
+// dear imgui: FreeType font builder (used as a replacement for the stb_truetype builder)
+// (code)
+
+// Get the latest version at https://github.com/ocornut/imgui/tree/master/misc/freetype
+// Original code by @vuhdo (Aleksei Skriabin). Improvements by @mikesart. Maintained since 2019 by @ocornut.
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2021/08/23: fixed crash when FT_Render_Glyph() fails to render a glyph and returns NULL.
+//  2021/03/05: added ImGuiFreeTypeBuilderFlags_Bitmap to load bitmap glyphs.
+//  2021/03/02: set 'atlas->TexPixelsUseColors = true' to help some backends with deciding of a prefered texture format.
+//  2021/01/28: added support for color-layered glyphs via ImGuiFreeTypeBuilderFlags_LoadColor (require Freetype 2.10+).
+//  2021/01/26: simplified integration by using '#define IMGUI_ENABLE_FREETYPE'.
+//              renamed ImGuiFreeType::XXX flags to ImGuiFreeTypeBuilderFlags_XXX for consistency with other API. removed ImGuiFreeType::BuildFontAtlas().
+//  2020/06/04: fix for rare case where FT_Get_Char_Index() succeed but FT_Load_Glyph() fails.
+//  2019/02/09: added RasterizerFlags::Monochrome flag to disable font anti-aliasing (combine with ::MonoHinting for best results!)
+//  2019/01/15: added support for imgui allocators + added FreeType only override function SetAllocatorFunctions().
+//  2019/01/10: re-factored to match big update in STB builder. fixed texture height waste. fixed redundant glyphs when merging. support for glyph padding.
+//  2018/06/08: added support for ImFontConfig::GlyphMinAdvanceX, GlyphMaxAdvanceX.
+//  2018/02/04: moved to main imgui repository (away from http://www.github.com/ocornut/imgui_club)
+//  2018/01/22: fix for addition of ImFontAtlas::TexUvscale member.
+//  2017/10/22: minor inconsequential change to match change in master (removed an unnecessary statement).
+//  2017/09/26: fixes for imgui internal changes.
+//  2017/08/26: cleanup, optimizations, support for ImFontConfig::RasterizerFlags, ImFontConfig::RasterizerMultiply.
+//  2017/08/16: imported from https://github.com/Vuhdo/imgui_freetype into http://www.github.com/ocornut/imgui_club, updated for latest changes in ImFontAtlas, minor tweaks.
+
+// About Gamma Correct Blending:
+// - FreeType assumes blending in linear space rather than gamma space.
+// - See https://www.freetype.org/freetype2/docs/reference/ft2-base_interface.html#FT_Render_Glyph
+// - For correct results you need to be using sRGB and convert to linear space in the pixel shader output.
+// - The default dear imgui styles will be impacted by this change (alpha values will need tweaking).
+
+// FIXME: cfg.OversampleH, OversampleV are not supported (but perhaps not so necessary with this rasterizer).
+
+#include "imgui_freetype.h"
+#include "imgui_internal.h"     // ImMin,ImMax,ImFontAtlasBuild*,
+#include <stdint.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H          // <freetype/freetype.h>
+#include FT_MODULE_H            // <freetype/ftmodapi.h>
+#include FT_GLYPH_H             // <freetype/ftglyph.h>
+#include FT_SYNTHESIS_H         // <freetype/ftsynth.h>
+
+#ifdef _MSC_VER
+#pragma warning (disable: 4505)     // unreferenced local function has been removed (stb stuff)
+#pragma warning (disable: 26812)    // [Static Analyzer] The enum type 'xxx' is unscoped. Prefer 'enum class' over 'enum' (Enum.3).
+#endif
+
+#if defined(__GNUC__)
+#pragma GCC diagnostic ignored "-Wpragmas"                  // warning: unknown option after '#pragma GCC diagnostic' kind
+#pragma GCC diagnostic ignored "-Wunused-function"          // warning: 'xxxx' defined but not used
+#endif
+
+//-------------------------------------------------------------------------
+// Data
+//-------------------------------------------------------------------------
+
+// Default memory allocators
+static void* ImGuiFreeTypeDefaultAllocFunc(size_t size, void* user_data) { IM_UNUSED(user_data); return IM_ALLOC(size); }
+static void  ImGuiFreeTypeDefaultFreeFunc(void* ptr, void* user_data) { IM_UNUSED(user_data); IM_FREE(ptr); }
+
+// Current memory allocators
+static void* (*GImGuiFreeTypeAllocFunc)(size_t size, void* user_data) = ImGuiFreeTypeDefaultAllocFunc;
+static void  (*GImGuiFreeTypeFreeFunc)(void* ptr, void* user_data) = ImGuiFreeTypeDefaultFreeFunc;
+static void* GImGuiFreeTypeAllocatorUserData = NULL;
+
+//-------------------------------------------------------------------------
+// Code
+//-------------------------------------------------------------------------
+
+namespace
+{
+    // Glyph metrics:
+    // --------------
+    //
+    //                       xmin                     xmax
+    //                        |                         |
+    //                        |<-------- width -------->|
+    //                        |                         |
+    //              |         +-------------------------+----------------- ymax
+    //              |         |    ggggggggg   ggggg    |     ^        ^
+    //              |         |   g:::::::::ggg::::g    |     |        |
+    //              |         |  g:::::::::::::::::g    |     |        |
+    //              |         | g::::::ggggg::::::gg    |     |        |
+    //              |         | g:::::g     g:::::g     |     |        |
+    //    offsetX  -|-------->| g:::::g     g:::::g     |  offsetY     |
+    //              |         | g:::::g     g:::::g     |     |        |
+    //              |         | g::::::g    g:::::g     |     |        |
+    //              |         | g:::::::ggggg:::::g     |     |        |
+    //              |         |  g::::::::::::::::g     |     |      height
+    //              |         |   gg::::::::::::::g     |     |        |
+    //  baseline ---*---------|---- gggggggg::::::g-----*--------      |
+    //            / |         |             g:::::g     |              |
+    //     origin   |         | gggggg      g:::::g     |              |
+    //              |         | g:::::gg   gg:::::g     |              |
+    //              |         |  g::::::ggg:::::::g     |              |
+    //              |         |   gg:::::::::::::g      |              |
+    //              |         |     ggg::::::ggg        |              |
+    //              |         |         gggggg          |              v
+    //              |         +-------------------------+----------------- ymin
+    //              |                                   |
+    //              |------------- advanceX ----------->|
+
+    // A structure that describe a glyph.
+    struct GlyphInfo
+    {
+        int         Width;              // Glyph's width in pixels.
+        int         Height;             // Glyph's height in pixels.
+        FT_Int      OffsetX;            // The distance from the origin ("pen position") to the left of the glyph.
+        FT_Int      OffsetY;            // The distance from the origin to the top of the glyph. This is usually a value < 0.
+        float       AdvanceX;           // The distance from the origin to the origin of the next glyph. This is usually a value > 0.
+        bool        IsColored;          // The glyph is colored
+    };
+
+    // Font parameters and metrics.
+    struct FontInfo
+    {
+        uint32_t    PixelHeight;        // Size this font was generated with.
+        float       Ascender;           // The pixel extents above the baseline in pixels (typically positive).
+        float       Descender;          // The extents below the baseline in pixels (typically negative).
+        float       LineSpacing;        // The baseline-to-baseline distance. Note that it usually is larger than the sum of the ascender and descender taken as absolute values. There is also no guarantee that no glyphs extend above or below subsequent baselines when using this distance. Think of it as a value the designer of the font finds appropriate.
+        float       LineGap;            // The spacing in pixels between one row's descent and the next row's ascent.
+        float       MaxAdvanceWidth;    // This field gives the maximum horizontal cursor advance for all glyphs in the font.
+    };
+
+    // FreeType glyph rasterizer.
+    // NB: No ctor/dtor, explicitly call Init()/Shutdown()
+    struct FreeTypeFont
+    {
+        bool                    InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_user_flags); // Initialize from an external data buffer. Doesn't copy data, and you must ensure it stays valid up to this object lifetime.
+        void                    CloseFont();
+        void                    SetPixelHeight(int pixel_height); // Change font pixel size. All following calls to RasterizeGlyph() will use this size
+        const FT_Glyph_Metrics* LoadGlyph(uint32_t in_codepoint);
+        const FT_Bitmap*        RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info);
+        void                    BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
+        ~FreeTypeFont()         { CloseFont(); }
+
+        // [Internals]
+        FontInfo        Info;               // Font descriptor of the current font.
+        FT_Face         Face;
+        unsigned int    UserFlags;          // = ImFontConfig::RasterizerFlags
+        FT_Int32        LoadFlags;
+        FT_Render_Mode  RenderMode;
+    };
+
+    // From SDL_ttf: Handy routines for converting from fixed point
+    #define FT_CEIL(X)  (((X + 63) & -64) / 64)
+
+    bool FreeTypeFont::InitFont(FT_Library ft_library, const ImFontConfig& cfg, unsigned int extra_font_builder_flags)
+    {
+        FT_Error error = FT_New_Memory_Face(ft_library, (uint8_t*)cfg.FontData, (uint32_t)cfg.FontDataSize, (uint32_t)cfg.FontNo, &Face);
+        if (error != 0)
+            return false;
+        error = FT_Select_Charmap(Face, FT_ENCODING_UNICODE);
+        if (error != 0)
+            return false;
+
+        // Convert to FreeType flags (NB: Bold and Oblique are processed separately)
+        UserFlags = cfg.FontBuilderFlags | extra_font_builder_flags;
+
+        LoadFlags = 0;
+        if ((UserFlags & ImGuiFreeTypeBuilderFlags_Bitmap) == 0)
+            LoadFlags |= FT_LOAD_NO_BITMAP;
+
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_NoHinting)
+            LoadFlags |= FT_LOAD_NO_HINTING;
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_NoAutoHint)
+            LoadFlags |= FT_LOAD_NO_AUTOHINT;
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_ForceAutoHint)
+            LoadFlags |= FT_LOAD_FORCE_AUTOHINT;
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_LightHinting)
+            LoadFlags |= FT_LOAD_TARGET_LIGHT;
+        else if (UserFlags & ImGuiFreeTypeBuilderFlags_MonoHinting)
+            LoadFlags |= FT_LOAD_TARGET_MONO;
+        else
+            LoadFlags |= FT_LOAD_TARGET_NORMAL;
+
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_Monochrome)
+            RenderMode = FT_RENDER_MODE_MONO;
+        else
+            RenderMode = FT_RENDER_MODE_NORMAL;
+
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_LoadColor)
+            LoadFlags |= FT_LOAD_COLOR;
+
+        memset(&Info, 0, sizeof(Info));
+        SetPixelHeight((uint32_t)cfg.SizePixels);
+
+        return true;
+    }
+
+    void FreeTypeFont::CloseFont()
+    {
+        if (Face)
+        {
+            FT_Done_Face(Face);
+            Face = NULL;
+        }
+    }
+
+    void FreeTypeFont::SetPixelHeight(int pixel_height)
+    {
+        // Vuhdo: I'm not sure how to deal with font sizes properly. As far as I understand, currently ImGui assumes that the 'pixel_height'
+        // is a maximum height of an any given glyph, i.e. it's the sum of font's ascender and descender. Seems strange to me.
+        // NB: FT_Set_Pixel_Sizes() doesn't seem to get us the same result.
+        FT_Size_RequestRec req;
+        req.type = (UserFlags & ImGuiFreeTypeBuilderFlags_Bitmap) ? FT_SIZE_REQUEST_TYPE_NOMINAL : FT_SIZE_REQUEST_TYPE_REAL_DIM;
+        req.width = 0;
+        req.height = (uint32_t)pixel_height * 64;
+        req.horiResolution = 0;
+        req.vertResolution = 0;
+        FT_Request_Size(Face, &req);
+
+        // Update font info
+        FT_Size_Metrics metrics = Face->size->metrics;
+        Info.PixelHeight = (uint32_t)pixel_height;
+        Info.Ascender = (float)FT_CEIL(metrics.ascender);
+        Info.Descender = (float)FT_CEIL(metrics.descender);
+        Info.LineSpacing = (float)FT_CEIL(metrics.height);
+        Info.LineGap = (float)FT_CEIL(metrics.height - metrics.ascender + metrics.descender);
+        Info.MaxAdvanceWidth = (float)FT_CEIL(metrics.max_advance);
+    }
+
+    const FT_Glyph_Metrics* FreeTypeFont::LoadGlyph(uint32_t codepoint)
+    {
+        uint32_t glyph_index = FT_Get_Char_Index(Face, codepoint);
+        if (glyph_index == 0)
+            return NULL;
+
+		// If this crash for you: FreeType 2.11.0 has a crash bug on some bitmap/colored fonts.
+		// - https://gitlab.freedesktop.org/freetype/freetype/-/issues/1076
+		// - https://github.com/ocornut/imgui/issues/4567
+		// - https://github.com/ocornut/imgui/issues/4566
+		// You can use FreeType 2.10, or the patched version of 2.11.0 in VcPkg, or probably any upcoming FreeType version.
+        FT_Error error = FT_Load_Glyph(Face, glyph_index, LoadFlags);
+        if (error)
+            return NULL;
+
+        // Need an outline for this to work
+        FT_GlyphSlot slot = Face->glyph;
+        IM_ASSERT(slot->format == FT_GLYPH_FORMAT_OUTLINE || slot->format == FT_GLYPH_FORMAT_BITMAP);
+
+        // Apply convenience transform (this is not picking from real "Bold"/"Italic" fonts! Merely applying FreeType helper transform. Oblique == Slanting)
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_Bold)
+            FT_GlyphSlot_Embolden(slot);
+        if (UserFlags & ImGuiFreeTypeBuilderFlags_Oblique)
+        {
+            FT_GlyphSlot_Oblique(slot);
+            //FT_BBox bbox;
+            //FT_Outline_Get_BBox(&slot->outline, &bbox);
+            //slot->metrics.width = bbox.xMax - bbox.xMin;
+            //slot->metrics.height = bbox.yMax - bbox.yMin;
+        }
+
+        return &slot->metrics;
+    }
+
+    const FT_Bitmap* FreeTypeFont::RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info)
+    {
+        FT_GlyphSlot slot = Face->glyph;
+        FT_Error error = FT_Render_Glyph(slot, RenderMode);
+        if (error != 0)
+            return NULL;
+
+        FT_Bitmap* ft_bitmap = &Face->glyph->bitmap;
+        out_glyph_info->Width = (int)ft_bitmap->width;
+        out_glyph_info->Height = (int)ft_bitmap->rows;
+        out_glyph_info->OffsetX = Face->glyph->bitmap_left;
+        out_glyph_info->OffsetY = -Face->glyph->bitmap_top;
+        out_glyph_info->AdvanceX = (float)FT_CEIL(slot->advance.x);
+        out_glyph_info->IsColored = (ft_bitmap->pixel_mode == FT_PIXEL_MODE_BGRA);
+
+        return ft_bitmap;
+    }
+
+    void FreeTypeFont::BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
+    {
+        IM_ASSERT(ft_bitmap != NULL);
+        const uint32_t w = ft_bitmap->width;
+        const uint32_t h = ft_bitmap->rows;
+        const uint8_t* src = ft_bitmap->buffer;
+        const uint32_t src_pitch = ft_bitmap->pitch;
+
+        switch (ft_bitmap->pixel_mode)
+        {
+        case FT_PIXEL_MODE_GRAY: // Grayscale image, 1 byte per pixel.
+            {
+                if (multiply_table == NULL)
+                {
+                    for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
+                        for (uint32_t x = 0; x < w; x++)
+                            dst[x] = IM_COL32(255, 255, 255, src[x]);
+                }
+                else
+                {
+                    for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
+                        for (uint32_t x = 0; x < w; x++)
+                            dst[x] = IM_COL32(255, 255, 255, multiply_table[src[x]]);
+                }
+                break;
+            }
+        case FT_PIXEL_MODE_MONO: // Monochrome image, 1 bit per pixel. The bits in each byte are ordered from MSB to LSB.
+            {
+                uint8_t color0 = multiply_table ? multiply_table[0] : 0;
+                uint8_t color1 = multiply_table ? multiply_table[255] : 255;
+                for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
+                {
+                    uint8_t bits = 0;
+                    const uint8_t* bits_ptr = src;
+                    for (uint32_t x = 0; x < w; x++, bits <<= 1)
+                    {
+                        if ((x & 7) == 0)
+                            bits = *bits_ptr++;
+                        dst[x] = IM_COL32(255, 255, 255, (bits & 0x80) ? color1 : color0);
+                    }
+                }
+                break;
+            }
+        case FT_PIXEL_MODE_BGRA:
+            {
+                // FIXME: Converting pre-multiplied alpha to straight. Doesn't smell good.
+                #define DE_MULTIPLY(color, alpha) (ImU32)(255.0f * (float)color / (float)alpha + 0.5f)
+                if (multiply_table == NULL)
+                {
+                    for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
+                        for (uint32_t x = 0; x < w; x++)
+                        {
+                            uint8_t r = src[x * 4 + 2], g = src[x * 4 + 1], b = src[x * 4], a = src[x * 4 + 3];
+                            dst[x] = IM_COL32(DE_MULTIPLY(r, a), DE_MULTIPLY(g, a), DE_MULTIPLY(b, a), a);
+                        }
+                }
+                else
+                {
+                    for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
+                    {
+                        for (uint32_t x = 0; x < w; x++)
+                        {
+                            uint8_t r = src[x * 4 + 2], g = src[x * 4 + 1], b = src[x * 4], a = src[x * 4 + 3];
+                            dst[x] = IM_COL32(multiply_table[DE_MULTIPLY(r, a)], multiply_table[DE_MULTIPLY(g, a)], multiply_table[DE_MULTIPLY(b, a)], multiply_table[a]);
+                        }
+                    }
+                }
+                #undef DE_MULTIPLY
+                break;
+            }
+        default:
+            IM_ASSERT(0 && "FreeTypeFont::BlitGlyph(): Unknown bitmap pixel mode!");
+        }
+    }
+}
+
+#ifndef STB_RECT_PACK_IMPLEMENTATION                        // in case the user already have an implementation in the _same_ compilation unit (e.g. unity builds)
+#ifndef IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+#define STBRP_ASSERT(x)     do { IM_ASSERT(x); } while (0)
+#define STBRP_STATIC
+#define STB_RECT_PACK_IMPLEMENTATION
+#endif
+#ifdef IMGUI_STB_RECT_PACK_FILENAME
+#include IMGUI_STB_RECT_PACK_FILENAME
+#else
+#include "imstb_rectpack.h"
+#endif
+#endif
+
+struct ImFontBuildSrcGlyphFT
+{
+    GlyphInfo           Info;
+    uint32_t            Codepoint;
+    unsigned int*       BitmapData;         // Point within one of the dst_tmp_bitmap_buffers[] array
+
+    ImFontBuildSrcGlyphFT() { memset((void*)this, 0, sizeof(*this)); }
+};
+
+struct ImFontBuildSrcDataFT
+{
+    FreeTypeFont        Font;
+    stbrp_rect*         Rects;              // Rectangle to pack. We first fill in their size and the packer will give us their position.
+    const ImWchar*      SrcRanges;          // Ranges as requested by user (user is allowed to request too much, e.g. 0x0020..0xFFFF)
+    int                 DstIndex;           // Index into atlas->Fonts[] and dst_tmp_array[]
+    int                 GlyphsHighest;      // Highest requested codepoint
+    int                 GlyphsCount;        // Glyph count (excluding missing glyphs and glyphs already set by an earlier source font)
+    ImBitVector         GlyphsSet;          // Glyph bit map (random access, 1-bit per codepoint. This will be a maximum of 8KB)
+    ImVector<ImFontBuildSrcGlyphFT>   GlyphsList;
+};
+
+// Temporary data for one destination ImFont* (multiple source fonts can be merged into one destination ImFont)
+struct ImFontBuildDstDataFT
+{
+    int                 SrcCount;           // Number of source fonts targeting this destination font.
+    int                 GlyphsHighest;
+    int                 GlyphsCount;
+    ImBitVector         GlyphsSet;          // This is used to resolve collision when multiple sources are merged into a same destination font.
+};
+
+bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, unsigned int extra_flags)
+{
+    IM_ASSERT(atlas->ConfigData.Size > 0);
+
+    ImFontAtlasBuildInit(atlas);
+
+    // Clear atlas
+    atlas->TexID = (ImTextureID)NULL;
+    atlas->TexWidth = atlas->TexHeight = 0;
+    atlas->TexUvScale = ImVec2(0.0f, 0.0f);
+    atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
+    atlas->ClearTexData();
+
+    // Temporary storage for building
+    bool src_load_color = false;
+    ImVector<ImFontBuildSrcDataFT> src_tmp_array;
+    ImVector<ImFontBuildDstDataFT> dst_tmp_array;
+    src_tmp_array.resize(atlas->ConfigData.Size);
+    dst_tmp_array.resize(atlas->Fonts.Size);
+    memset((void*)src_tmp_array.Data, 0, (size_t)src_tmp_array.size_in_bytes());
+    memset((void*)dst_tmp_array.Data, 0, (size_t)dst_tmp_array.size_in_bytes());
+
+    // 1. Initialize font loading structure, check font data validity
+    for (int src_i = 0; src_i < atlas->ConfigData.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        FreeTypeFont& font_face = src_tmp.Font;
+        IM_ASSERT(cfg.DstFont && (!cfg.DstFont->IsLoaded() || cfg.DstFont->ContainerAtlas == atlas));
+
+        // Find index from cfg.DstFont (we allow the user to set cfg.DstFont. Also it makes casual debugging nicer than when storing indices)
+        src_tmp.DstIndex = -1;
+        for (int output_i = 0; output_i < atlas->Fonts.Size && src_tmp.DstIndex == -1; output_i++)
+            if (cfg.DstFont == atlas->Fonts[output_i])
+                src_tmp.DstIndex = output_i;
+        IM_ASSERT(src_tmp.DstIndex != -1); // cfg.DstFont not pointing within atlas->Fonts[] array?
+        if (src_tmp.DstIndex == -1)
+            return false;
+
+        // Load font
+        if (!font_face.InitFont(ft_library, cfg, extra_flags))
+            return false;
+
+        // Measure highest codepoints
+        src_load_color |= (cfg.FontBuilderFlags & ImGuiFreeTypeBuilderFlags_LoadColor) != 0;
+        ImFontBuildDstDataFT& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        src_tmp.SrcRanges = cfg.GlyphRanges ? cfg.GlyphRanges : atlas->GetGlyphRangesDefault();
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            src_tmp.GlyphsHighest = ImMax(src_tmp.GlyphsHighest, (int)src_range[1]);
+        dst_tmp.SrcCount++;
+        dst_tmp.GlyphsHighest = ImMax(dst_tmp.GlyphsHighest, src_tmp.GlyphsHighest);
+    }
+
+    // 2. For every requested codepoint, check for their presence in the font data, and handle redundancy or overlaps between source fonts to avoid unused glyphs.
+    int total_glyphs_count = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontBuildDstDataFT& dst_tmp = dst_tmp_array[src_tmp.DstIndex];
+        src_tmp.GlyphsSet.Create(src_tmp.GlyphsHighest + 1);
+        if (dst_tmp.GlyphsSet.Storage.empty())
+            dst_tmp.GlyphsSet.Create(dst_tmp.GlyphsHighest + 1);
+
+        for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
+            for (int codepoint = src_range[0]; codepoint <= (int)src_range[1]; codepoint++)
+            {
+                if (dst_tmp.GlyphsSet.TestBit(codepoint))    // Don't overwrite existing glyphs. We could make this an option (e.g. MergeOverwrite)
+                    continue;
+                uint32_t glyph_index = FT_Get_Char_Index(src_tmp.Font.Face, codepoint); // It is actually in the font? (FIXME-OPT: We are not storing the glyph_index..)
+                if (glyph_index == 0)
+                    continue;
+
+                // Add to avail set/counters
+                src_tmp.GlyphsCount++;
+                dst_tmp.GlyphsCount++;
+                src_tmp.GlyphsSet.SetBit(codepoint);
+                dst_tmp.GlyphsSet.SetBit(codepoint);
+                total_glyphs_count++;
+            }
+    }
+
+    // 3. Unpack our bit map into a flat list (we now have all the Unicode points that we know are requested _and_ available _and_ not overlapping another)
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        src_tmp.GlyphsList.reserve(src_tmp.GlyphsCount);
+
+        IM_ASSERT(sizeof(src_tmp.GlyphsSet.Storage.Data[0]) == sizeof(ImU32));
+        const ImU32* it_begin = src_tmp.GlyphsSet.Storage.begin();
+        const ImU32* it_end = src_tmp.GlyphsSet.Storage.end();
+        for (const ImU32* it = it_begin; it < it_end; it++)
+            if (ImU32 entries_32 = *it)
+                for (ImU32 bit_n = 0; bit_n < 32; bit_n++)
+                    if (entries_32 & ((ImU32)1 << bit_n))
+                    {
+                        ImFontBuildSrcGlyphFT src_glyph;
+                        src_glyph.Codepoint = (ImWchar)(((it - it_begin) << 5) + bit_n);
+                        //src_glyph.GlyphIndex = 0; // FIXME-OPT: We had this info in the previous step and lost it..
+                        src_tmp.GlyphsList.push_back(src_glyph);
+                    }
+        src_tmp.GlyphsSet.Clear();
+        IM_ASSERT(src_tmp.GlyphsList.Size == src_tmp.GlyphsCount);
+    }
+    for (int dst_i = 0; dst_i < dst_tmp_array.Size; dst_i++)
+        dst_tmp_array[dst_i].GlyphsSet.Clear();
+    dst_tmp_array.clear();
+
+    // Allocate packing character data and flag packed characters buffer as non-packed (x0=y0=x1=y1=0)
+    // (We technically don't need to zero-clear buf_rects, but let's do it for the sake of sanity)
+    ImVector<stbrp_rect> buf_rects;
+    buf_rects.resize(total_glyphs_count);
+    memset(buf_rects.Data, 0, (size_t)buf_rects.size_in_bytes());
+
+    // Allocate temporary rasterization data buffers.
+    // We could not find a way to retrieve accurate glyph size without rendering them.
+    // (e.g. slot->metrics->width not always matching bitmap->width, especially considering the Oblique transform)
+    // We allocate in chunks of 256 KB to not waste too much extra memory ahead. Hopefully users of FreeType won't find the temporary allocations.
+    const int BITMAP_BUFFERS_CHUNK_SIZE = 256 * 1024;
+    int buf_bitmap_current_used_bytes = 0;
+    ImVector<unsigned char*> buf_bitmap_buffers;
+    buf_bitmap_buffers.push_back((unsigned char*)IM_ALLOC(BITMAP_BUFFERS_CHUNK_SIZE));
+
+    // 4. Gather glyphs sizes so we can pack them in our virtual canvas.
+    // 8. Render/rasterize font characters into the texture
+    int total_surface = 0;
+    int buf_rects_out_n = 0;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        src_tmp.Rects = &buf_rects[buf_rects_out_n];
+        buf_rects_out_n += src_tmp.GlyphsCount;
+
+        // Compute multiply table if requested
+        const bool multiply_enabled = (cfg.RasterizerMultiply != 1.0f);
+        unsigned char multiply_table[256];
+        if (multiply_enabled)
+            ImFontAtlasBuildMultiplyCalcLookupTable(multiply_table, cfg.RasterizerMultiply);
+
+        // Gather the sizes of all rectangles we will need to pack
+        const int padding = atlas->TexGlyphPadding;
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsList.Size; glyph_i++)
+        {
+            ImFontBuildSrcGlyphFT& src_glyph = src_tmp.GlyphsList[glyph_i];
+
+            const FT_Glyph_Metrics* metrics = src_tmp.Font.LoadGlyph(src_glyph.Codepoint);
+            if (metrics == NULL)
+                continue;
+
+            // Render glyph into a bitmap (currently held by FreeType)
+            const FT_Bitmap* ft_bitmap = src_tmp.Font.RenderGlyphAndGetInfo(&src_glyph.Info);
+            if (ft_bitmap == NULL)
+                continue;
+
+            // Allocate new temporary chunk if needed
+            const int bitmap_size_in_bytes = src_glyph.Info.Width * src_glyph.Info.Height * 4;
+            if (buf_bitmap_current_used_bytes + bitmap_size_in_bytes > BITMAP_BUFFERS_CHUNK_SIZE)
+            {
+                buf_bitmap_current_used_bytes = 0;
+                buf_bitmap_buffers.push_back((unsigned char*)IM_ALLOC(BITMAP_BUFFERS_CHUNK_SIZE));
+            }
+
+            // Blit rasterized pixels to our temporary buffer and keep a pointer to it.
+            src_glyph.BitmapData = (unsigned int*)(buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes);
+            buf_bitmap_current_used_bytes += bitmap_size_in_bytes;
+            src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width, multiply_enabled ? multiply_table : NULL);
+
+            src_tmp.Rects[glyph_i].w = (stbrp_coord)(src_glyph.Info.Width + padding);
+            src_tmp.Rects[glyph_i].h = (stbrp_coord)(src_glyph.Info.Height + padding);
+            total_surface += src_tmp.Rects[glyph_i].w * src_tmp.Rects[glyph_i].h;
+        }
+    }
+
+    // We need a width for the skyline algorithm, any width!
+    // The exact width doesn't really matter much, but some API/GPU have texture size limitations and increasing width can decrease height.
+    // User can override TexDesiredWidth and TexGlyphPadding if they wish, otherwise we use a simple heuristic to select the width based on expected surface.
+    const int surface_sqrt = (int)ImSqrt((float)total_surface) + 1;
+    atlas->TexHeight = 0;
+    if (atlas->TexDesiredWidth > 0)
+        atlas->TexWidth = atlas->TexDesiredWidth;
+    else
+        atlas->TexWidth = (surface_sqrt >= 4096 * 0.7f) ? 4096 : (surface_sqrt >= 2048 * 0.7f) ? 2048 : (surface_sqrt >= 1024 * 0.7f) ? 1024 : 512;
+
+    // 5. Start packing
+    // Pack our extra data rectangles first, so it will be on the upper-left corner of our texture (UV will have small values).
+    const int TEX_HEIGHT_MAX = 1024 * 32;
+    const int num_nodes_for_packing_algorithm = atlas->TexWidth - atlas->TexGlyphPadding;
+    ImVector<stbrp_node> pack_nodes;
+    pack_nodes.resize(num_nodes_for_packing_algorithm);
+    stbrp_context pack_context;
+    stbrp_init_target(&pack_context, atlas->TexWidth, TEX_HEIGHT_MAX, pack_nodes.Data, pack_nodes.Size);
+    ImFontAtlasBuildPackCustomRects(atlas, &pack_context);
+
+    // 6. Pack each source font. No rendering yet, we are working with rectangles in an infinitely tall texture at this point.
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        stbrp_pack_rects(&pack_context, src_tmp.Rects, src_tmp.GlyphsCount);
+
+        // Extend texture height and mark missing glyphs as non-packed so we won't render them.
+        // FIXME: We are not handling packing failure here (would happen if we got off TEX_HEIGHT_MAX or if a single if larger than TexWidth?)
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
+            if (src_tmp.Rects[glyph_i].was_packed)
+                atlas->TexHeight = ImMax(atlas->TexHeight, src_tmp.Rects[glyph_i].y + src_tmp.Rects[glyph_i].h);
+    }
+
+    // 7. Allocate texture
+    atlas->TexHeight = (atlas->Flags & ImFontAtlasFlags_NoPowerOfTwoHeight) ? (atlas->TexHeight + 1) : ImUpperPowerOfTwo(atlas->TexHeight);
+    atlas->TexUvScale = ImVec2(1.0f / atlas->TexWidth, 1.0f / atlas->TexHeight);
+    if (src_load_color)
+    {
+        size_t tex_size = (size_t)atlas->TexWidth * atlas->TexHeight * 4;
+        atlas->TexPixelsRGBA32 = (unsigned int*)IM_ALLOC(tex_size);
+        memset(atlas->TexPixelsRGBA32, 0, tex_size);
+    }
+    else
+    {
+        size_t tex_size = (size_t)atlas->TexWidth * atlas->TexHeight * 1;
+        atlas->TexPixelsAlpha8 = (unsigned char*)IM_ALLOC(tex_size);
+        memset(atlas->TexPixelsAlpha8, 0, tex_size);
+    }
+
+    // 8. Copy rasterized font characters back into the main texture
+    // 9. Setup ImFont and glyphs for runtime
+    bool tex_use_colors = false;
+    for (int src_i = 0; src_i < src_tmp_array.Size; src_i++)
+    {
+        ImFontBuildSrcDataFT& src_tmp = src_tmp_array[src_i];
+        if (src_tmp.GlyphsCount == 0)
+            continue;
+
+        // When merging fonts with MergeMode=true:
+        // - We can have multiple input fonts writing into a same destination font.
+        // - dst_font->ConfigData is != from cfg which is our source configuration.
+        ImFontConfig& cfg = atlas->ConfigData[src_i];
+        ImFont* dst_font = cfg.DstFont;
+
+        const float ascent = src_tmp.Font.Info.Ascender;
+        const float descent = src_tmp.Font.Info.Descender;
+        ImFontAtlasBuildSetupFont(atlas, dst_font, &cfg, ascent, descent);
+        const float font_off_x = cfg.GlyphOffset.x;
+        const float font_off_y = cfg.GlyphOffset.y + IM_ROUND(dst_font->Ascent);
+
+        const int padding = atlas->TexGlyphPadding;
+        for (int glyph_i = 0; glyph_i < src_tmp.GlyphsCount; glyph_i++)
+        {
+            ImFontBuildSrcGlyphFT& src_glyph = src_tmp.GlyphsList[glyph_i];
+            stbrp_rect& pack_rect = src_tmp.Rects[glyph_i];
+            IM_ASSERT(pack_rect.was_packed);
+            if (pack_rect.w == 0 && pack_rect.h == 0)
+                continue;
+
+            GlyphInfo& info = src_glyph.Info;
+            IM_ASSERT(info.Width + padding <= pack_rect.w);
+            IM_ASSERT(info.Height + padding <= pack_rect.h);
+            const int tx = pack_rect.x + padding;
+            const int ty = pack_rect.y + padding;
+
+            // Register glyph
+            float x0 = info.OffsetX + font_off_x;
+            float y0 = info.OffsetY + font_off_y;
+            float x1 = x0 + info.Width;
+            float y1 = y0 + info.Height;
+            float u0 = (tx) / (float)atlas->TexWidth;
+            float v0 = (ty) / (float)atlas->TexHeight;
+            float u1 = (tx + info.Width) / (float)atlas->TexWidth;
+            float v1 = (ty + info.Height) / (float)atlas->TexHeight;
+            dst_font->AddGlyph(&cfg, (ImWchar)src_glyph.Codepoint, x0, y0, x1, y1, u0, v0, u1, v1, info.AdvanceX);
+
+            ImFontGlyph* dst_glyph = &dst_font->Glyphs.back();
+            IM_ASSERT(dst_glyph->Codepoint == src_glyph.Codepoint);
+            if (src_glyph.Info.IsColored)
+                dst_glyph->Colored = tex_use_colors = true;
+
+            // Blit from temporary buffer to final texture
+            size_t blit_src_stride = (size_t)src_glyph.Info.Width;
+            size_t blit_dst_stride = (size_t)atlas->TexWidth;
+            unsigned int* blit_src = src_glyph.BitmapData;
+            if (atlas->TexPixelsAlpha8 != NULL)
+            {
+                unsigned char* blit_dst = atlas->TexPixelsAlpha8 + (ty * blit_dst_stride) + tx;
+                for (int y = 0; y < info.Height; y++, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
+                    for (int x = 0; x < info.Width; x++)
+                        blit_dst[x] = (unsigned char)((blit_src[x] >> IM_COL32_A_SHIFT) & 0xFF);
+            }
+            else
+            {
+                unsigned int* blit_dst = atlas->TexPixelsRGBA32 + (ty * blit_dst_stride) + tx;
+                for (int y = 0; y < info.Height; y++, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
+                    for (int x = 0; x < info.Width; x++)
+                        blit_dst[x] = blit_src[x];
+            }
+        }
+
+        src_tmp.Rects = NULL;
+    }
+    atlas->TexPixelsUseColors = tex_use_colors;
+
+    // Cleanup
+    for (int buf_i = 0; buf_i < buf_bitmap_buffers.Size; buf_i++)
+        IM_FREE(buf_bitmap_buffers[buf_i]);
+    src_tmp_array.clear_destruct();
+
+    ImFontAtlasBuildFinish(atlas);
+
+    return true;
+}
+
+// FreeType memory allocation callbacks
+static void* FreeType_Alloc(FT_Memory /*memory*/, long size)
+{
+    return GImGuiFreeTypeAllocFunc((size_t)size, GImGuiFreeTypeAllocatorUserData);
+}
+
+static void FreeType_Free(FT_Memory /*memory*/, void* block)
+{
+    GImGuiFreeTypeFreeFunc(block, GImGuiFreeTypeAllocatorUserData);
+}
+
+static void* FreeType_Realloc(FT_Memory /*memory*/, long cur_size, long new_size, void* block)
+{
+    // Implement realloc() as we don't ask user to provide it.
+    if (block == NULL)
+        return GImGuiFreeTypeAllocFunc((size_t)new_size, GImGuiFreeTypeAllocatorUserData);
+
+    if (new_size == 0)
+    {
+        GImGuiFreeTypeFreeFunc(block, GImGuiFreeTypeAllocatorUserData);
+        return NULL;
+    }
+
+    if (new_size > cur_size)
+    {
+        void* new_block = GImGuiFreeTypeAllocFunc((size_t)new_size, GImGuiFreeTypeAllocatorUserData);
+        memcpy(new_block, block, (size_t)cur_size);
+        GImGuiFreeTypeFreeFunc(block, GImGuiFreeTypeAllocatorUserData);
+        return new_block;
+    }
+
+    return block;
+}
+
+static bool ImFontAtlasBuildWithFreeType(ImFontAtlas* atlas)
+{
+    // FreeType memory management: https://www.freetype.org/freetype2/docs/design/design-4.html
+    FT_MemoryRec_ memory_rec = {};
+    memory_rec.user = NULL;
+    memory_rec.alloc = &FreeType_Alloc;
+    memory_rec.free = &FreeType_Free;
+    memory_rec.realloc = &FreeType_Realloc;
+
+    // https://www.freetype.org/freetype2/docs/reference/ft2-module_management.html#FT_New_Library
+    FT_Library ft_library;
+    FT_Error error = FT_New_Library(&memory_rec, &ft_library);
+    if (error != 0)
+        return false;
+
+    // If you don't call FT_Add_Default_Modules() the rest of code may work, but FreeType won't use our custom allocator.
+    FT_Add_Default_Modules(ft_library);
+
+    bool ret = ImFontAtlasBuildWithFreeTypeEx(ft_library, atlas, atlas->FontBuilderFlags);
+    FT_Done_Library(ft_library);
+
+    return ret;
+}
+
+const ImFontBuilderIO* ImGuiFreeType::GetBuilderForFreeType()
+{
+    static ImFontBuilderIO io;
+    io.FontBuilder_Build = ImFontAtlasBuildWithFreeType;
+    return &io;
+}
+
+void ImGuiFreeType::SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data)
+{
+    GImGuiFreeTypeAllocFunc = alloc_func;
+    GImGuiFreeTypeFreeFunc = free_func;
+    GImGuiFreeTypeAllocatorUserData = user_data;
+}

extern/imgui_patched/misc/freetype/imgui_freetype.h

@@ -0,0 +1,50 @@
+// dear imgui: FreeType font builder (used as a replacement for the stb_truetype builder)
+// (headers)
+
+#pragma once
+
+#include "imgui.h"      // IMGUI_API
+
+// Forward declarations
+struct ImFontAtlas;
+struct ImFontBuilderIO;
+
+// Hinting greatly impacts visuals (and glyph sizes).
+// - By default, hinting is enabled and the font's native hinter is preferred over the auto-hinter.
+// - When disabled, FreeType generates blurrier glyphs, more or less matches the stb_truetype.h
+// - The Default hinting mode usually looks good, but may distort glyphs in an unusual way.
+// - The Light hinting mode generates fuzzier glyphs but better matches Microsoft's rasterizer.
+// You can set those flags globaly in ImFontAtlas::FontBuilderFlags
+// You can set those flags on a per font basis in ImFontConfig::FontBuilderFlags
+enum ImGuiFreeTypeBuilderFlags
+{
+    ImGuiFreeTypeBuilderFlags_NoHinting     = 1 << 0,   // Disable hinting. This generally generates 'blurrier' bitmap glyphs when the glyph are rendered in any of the anti-aliased modes.
+    ImGuiFreeTypeBuilderFlags_NoAutoHint    = 1 << 1,   // Disable auto-hinter.
+    ImGuiFreeTypeBuilderFlags_ForceAutoHint = 1 << 2,   // Indicates that the auto-hinter is preferred over the font's native hinter.
+    ImGuiFreeTypeBuilderFlags_LightHinting  = 1 << 3,   // A lighter hinting algorithm for gray-level modes. Many generated glyphs are fuzzier but better resemble their original shape. This is achieved by snapping glyphs to the pixel grid only vertically (Y-axis), as is done by Microsoft's ClearType and Adobe's proprietary font renderer. This preserves inter-glyph spacing in horizontal text.
+    ImGuiFreeTypeBuilderFlags_MonoHinting   = 1 << 4,   // Strong hinting algorithm that should only be used for monochrome output.
+    ImGuiFreeTypeBuilderFlags_Bold          = 1 << 5,   // Styling: Should we artificially embolden the font?
+    ImGuiFreeTypeBuilderFlags_Oblique       = 1 << 6,   // Styling: Should we slant the font, emulating italic style?
+    ImGuiFreeTypeBuilderFlags_Monochrome    = 1 << 7,   // Disable anti-aliasing. Combine this with MonoHinting for best results!
+    ImGuiFreeTypeBuilderFlags_LoadColor     = 1 << 8,   // Enable FreeType color-layered glyphs
+    ImGuiFreeTypeBuilderFlags_Bitmap        = 1 << 9    // Enable FreeType bitmap glyphs
+};
+
+namespace ImGuiFreeType
+{
+    // This is automatically assigned when using '#define IMGUI_ENABLE_FREETYPE'.
+    // If you need to dynamically select between multiple builders:
+    // - you can manually assign this builder with 'atlas->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType()'
+    // - prefer deep-copying this into your own ImFontBuilderIO instance if you use hot-reloading that messes up static data.
+    IMGUI_API const ImFontBuilderIO*    GetBuilderForFreeType();
+
+    // Override allocators. By default ImGuiFreeType will use IM_ALLOC()/IM_FREE()
+    // However, as FreeType does lots of allocations we provide a way for the user to redirect it to a separate memory heap if desired.
+    IMGUI_API void                      SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data = NULL);
+
+    // Obsolete names (will be removed soon)
+    // Prefer using '#define IMGUI_ENABLE_FREETYPE'
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+    static inline bool BuildFontAtlas(ImFontAtlas* atlas, unsigned int flags = 0) { atlas->FontBuilderIO = GetBuilderForFreeType(); atlas->FontBuilderFlags = flags; return atlas->Build(); }
+#endif
+}

extern/imgui_patched/misc/single_file/imgui_single_file.h

@@ -0,0 +1,18 @@
+// dear imgui: single-file wrapper include
+// We use this to validate compiling all *.cpp files in a same compilation unit.
+// Users of that technique (also called "Unity builds") can generally provide this themselves,
+// so we don't really recommend you use this in your projects.
+
+// Do this:
+//    #define IMGUI_IMPLEMENTATION
+// Before you include this file in *one* C++ file to create the implementation.
+// Using this in your project will leak the contents of imgui_internal.h and ImVec2 operators in this compilation unit.
+#include "../../imgui.h"
+
+#ifdef IMGUI_IMPLEMENTATION
+#include "../../imgui.cpp"
+#include "../../imgui_demo.cpp"
+#include "../../imgui_draw.cpp"
+#include "../../imgui_tables.cpp"
+#include "../../imgui_widgets.cpp"
+#endif

papers/format.md

@@ -29,6 +29,7 @@ furthermore, an `or reserved` indicates this field is always present, but is res
 
 the format versions are:
 
+- 96: Furnace dev96
 - 95: Furnace dev95
 - 94: Furnace dev94
 - 93: Furnace dev93
@@ -221,6 +222,9 @@ size | description
      |   - 0xb6: OPN extended - 9 channels
      |   - 0xb7: PC-98 extended - 19 channels
      |   - 0xb8: YMZ280B - 8 channels
+     |   - 0xb9: Namco WSG - 3 channels
+     |   - 0xba: Namco 15xx - 8 channels
+     |   - 0xbb: Namco CUS30 - 8 channels
      |   - 0xde: YM2610B extended - 19 channels
      |   - 0xe0: QSound - 19 channels
      |   - 0xfd: Dummy System - 8 channels
@@ -296,7 +300,10 @@ size | description
   1  | SN duty macro always resets phase (>=86) or reserved
   1  | pitch macro is linear (>=90) or reserved
   1  | pitch slide speed in full linear pitch mode (>=94) or reserved
- 18  | reserved
+ 14  | reserved
+ --- | **virtual tempo data**
+  2  | virtual tempo numerator of first song (>=96) or reserved
+  2  | virtual tempo denominator of first song (>=96) or reserved
  --- | **additional subsongs** (>=95)
  STR | first subsong name
  STR | first subsong comment
@@ -328,7 +335,8 @@ size | description
      | - the limit is 256.
   1  | highlight A
   1  | highlight B
-  4  | reserved
+  2  | virtual tempo numerator
+  2  | virtual tempo denominator
  STR | subsong name
  STR | subsong comment
  ??? | orders
@@ -401,6 +409,7 @@ size | description
      | - 28: MultiPCM
      | - 29: SNES
      | - 30: Sound Unit
+     | - 31: Namco WSG
   1  | reserved
  STR | instrument name
  --- | **FM instrument data**
@@ -798,12 +807,10 @@ size | description
   1  | depth
      | - 0: ZX Spectrum overlay drum (1-bit)
      | - 1: 1-bit NES DPCM (1-bit)
-     | - 2: AICA ADPCM
      | - 3: YMZ ADPCM
      | - 4: QSound ADPCM
      | - 5: ADPCM-A
      | - 6: ADPCM-B
-     | - 7: X68000 ADPCM
      | - 8: 8-bit PCM
      | - 9: BRR (SNES)
      | - 10: VOX

src/engine/dispatch.h

@@ -59,6 +59,8 @@ enum DivDispatchCmds {
   DIV_CMD_SAMPLE_FREQ, // (frequency)
   DIV_CMD_SAMPLE_BANK, // (bank)
   DIV_CMD_SAMPLE_POS, // (pos)
+  DIV_CMD_SAMPLE_TRANSWAVE_SLICE_MODE, // (enabled)
+  DIV_CMD_SAMPLE_TRANSWAVE_SLICE_POS, // (slice)
 
   DIV_CMD_FM_HARD_RESET, // (enabled)
   DIV_CMD_FM_LFO, // (speed)
@@ -181,6 +183,13 @@ enum DivDispatchCmds {
   DIV_CMD_ES5506_ENVELOPE_K2RAMP, // (ramp, slowdown)
   DIV_CMD_ES5506_PAUSE, // (value)
 
+  DIV_CMD_SU_SWEEP_PERIOD_LOW, // (which, val)
+  DIV_CMD_SU_SWEEP_PERIOD_HIGH, // (which, val)
+  DIV_CMD_SU_SWEEP_BOUND, // (which, val)
+  DIV_CMD_SU_SWEEP_ENABLE, // (which, val)
+  DIV_CMD_SU_SYNC_PERIOD_LOW,
+  DIV_CMD_SU_SYNC_PERIOD_HIGH,
+
   DIV_ALWAYS_SET_VOLUME, // () -> alwaysSetVol
 
   DIV_CMD_MAX

src/engine/dispatchContainer.cpp

@@ -21,6 +21,7 @@
 #include "engine.h"
 #include "platform/genesis.h"
 #include "platform/genesisext.h"
+#include "platform/namcowsg.h"
 #include "platform/sms.h"
 #include "platform/opll.h"
 #include "platform/gb.h"
@@ -32,6 +33,7 @@
 #include "platform/ym2203.h"
 #include "platform/ym2203ext.h"
 #include "platform/ym2608.h"
+#include "platform/ym2608ext.h"
 #include "platform/ym2610.h"
 #include "platform/ym2610ext.h"
 #include "platform/ym2610b.h"
@@ -59,6 +61,8 @@
 #include "platform/mmc5.h"
 #include "platform/es5506.h"
 #include "platform/scc.h"
+#include "platform/ymz280b.h"
+#include "platform/rf5c68.h"
 #include "platform/dummy.h"
 #include "../ta-log.h"
 #include "platform/zxbeeper.h"
@@ -248,6 +252,9 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
     case DIV_SYSTEM_PC98:
       dispatch=new DivPlatformYM2608;
       break;
+    case DIV_SYSTEM_PC98_EXT:
+      dispatch=new DivPlatformYM2608Ext;
+      break;
     case DIV_SYSTEM_OPLL:
     case DIV_SYSTEM_OPLL_DRUMS:
     case DIV_SYSTEM_VRC7:
@@ -351,9 +358,29 @@ void DivDispatchContainer::init(DivSystem sys, DivEngine* eng, int chanCount, do
       dispatch=new DivPlatformSCC;
       ((DivPlatformSCC*)dispatch)->setChipModel(true);
       break;
+    case DIV_SYSTEM_YMZ280B:
+      dispatch=new DivPlatformYMZ280B;
+      ((DivPlatformYMZ280B*)dispatch)->setChipModel(280);
+      break;
+    case DIV_SYSTEM_RF5C68:
+      dispatch=new DivPlatformRF5C68;
+      break;
     case DIV_SYSTEM_SOUND_UNIT:
       dispatch=new DivPlatformSoundUnit;
       break;
+    case DIV_SYSTEM_NAMCO:
+      dispatch=new DivPlatformNamcoWSG;
+      // Pac-Man (TODO: support Pole Position?)
+      ((DivPlatformNamcoWSG*)dispatch)->setDeviceType(1);
+      break;
+    case DIV_SYSTEM_NAMCO_15XX:
+      dispatch=new DivPlatformNamcoWSG;
+      ((DivPlatformNamcoWSG*)dispatch)->setDeviceType(15);
+      break;
+    case DIV_SYSTEM_NAMCO_CUS30:
+      dispatch=new DivPlatformNamcoWSG;
+      ((DivPlatformNamcoWSG*)dispatch)->setDeviceType(30);
+      break;
     case DIV_SYSTEM_DUMMY:
       dispatch=new DivPlatformDummy;
       break;

src/engine/engine.cpp

@@ -1069,6 +1069,7 @@ void DivEngine::playSub(bool preserveDrift, int goalRow) {
     endOfSong=false;
   } else {
     ticks=1;
+    tempoAccum=0;
     totalTicks=0;
     totalSeconds=0;
     totalTicksR=0;
@@ -2683,6 +2684,7 @@ void DivEngine::quitDispatch() {
   speedAB=false;
   endOfSong=false;
   ticks=0;
+  tempoAccum=0;
   curRow=0;
   curOrder=0;
   nextSpeed=3;

src/engine/engine.h

@@ -45,8 +45,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev95"
+#define DIV_VERSION "dev96"
-#define DIV_ENGINE_VERSION 95
+#define DIV_ENGINE_VERSION 96
 
 // for imports
 #define DIV_VERSION_MOD 0xff01
@@ -312,6 +312,7 @@ class DivEngine {
   int changeOrd, changePos, totalSeconds, totalTicks, totalTicksR, totalCmds, lastCmds, cmdsPerSecond, globalPitch;
   unsigned char extValue;
   unsigned char speed1, speed2;
+  short tempoAccum;
   DivStatusView view;
   DivHaltPositions haltOn;
   DivChannelState chan[DIV_MAX_CHANS];
@@ -944,6 +945,7 @@ class DivEngine {
       extValue(0),
       speed1(3),
       speed2(3),
+      tempoAccum(0),
       view(DIV_STATUS_NOTHING),
       haltOn(DIV_HALT_NONE),
       audioEngine(DIV_AUDIO_NULL),

src/engine/fileOps.cpp

@@ -1404,11 +1404,19 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<18; i++) {
+      for (int i=0; i<14; i++) {
         reader.readC();
       }
     }
 
+    // first song virtual tempo
+    if (ds.version>=96) {
+      subSong->virtualTempoN=reader.readS();
+      subSong->virtualTempoD=reader.readS();
+    } else {
+      reader.readI();
+    }
+
     // subsongs
     if (ds.version>=95) {
       subSong->name=reader.readString();
@@ -1457,7 +1465,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
         subSong->hilightA=reader.readC();
         subSong->hilightB=reader.readC();
 
-        reader.readI(); // reserved
+        if (ds.version>=96) {
+          subSong->virtualTempoN=reader.readS();
+          subSong->virtualTempoD=reader.readS();
+        } else {
+          reader.readI();
+        }
 
         subSong->name=reader.readString();
         subSong->notes=reader.readString();
@@ -2871,10 +2884,14 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   w->writeC(song.snDutyReset);
   w->writeC(song.pitchMacroIsLinear);
   w->writeC(song.pitchSlideSpeed);
-  for (int i=0; i<18; i++) {
+  for (int i=0; i<14; i++) {
     w->writeC(0);
   }
 
+  // first subsong virtual tempo
+  w->writeS(subSong->virtualTempoN);
+  w->writeS(subSong->virtualTempoD);
+  
   // subsong list
   w->writeString(subSong->name,false);
   w->writeString(subSong->notes,false);
@@ -2904,7 +2921,8 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
     w->writeS(subSong->ordersLen);
     w->writeC(subSong->hilightA);
     w->writeC(subSong->hilightB);
-    w->writeI(0); // reserved
+    w->writeS(subSong->virtualTempoN);
+    w->writeS(subSong->virtualTempoD);
 
     w->writeString(subSong->name,false);
     w->writeString(subSong->notes,false);
@@ -3184,6 +3202,14 @@ SafeWriter* DivEngine::saveDMF(unsigned char version) {
     addWarning("only the currently selected subsong will be saved");
   }
 
+  if (curSubSong->virtualTempoD!=curSubSong->virtualTempoN) {
+    addWarning(".dmf format does not support virtual tempo");
+  }
+
+  if (song.tuning<439.99 && song.tuning>440.01) {
+    addWarning(".dmf format does not support tuning");
+  }
+
   if (sys==DIV_SYSTEM_C64_6581 || sys==DIV_SYSTEM_C64_8580) {
     addWarning("absolute duty/cutoff macro not available in .dmf!");
     addWarning("duty precision will be lost");

src/engine/instrument.h

@@ -60,6 +60,7 @@ enum DivInstrumentType: unsigned short {
   DIV_INS_MULTIPCM=28,
   DIV_INS_SNES=29,
   DIV_INS_SU=30,
+  DIV_INS_NAMCO=31,
   DIV_INS_MAX,
   DIV_INS_NULL
 };
@@ -512,6 +513,7 @@ enum DivWaveSynthEffects {
   DIV_WS_SUBTRACT,
   DIV_WS_AVERAGE,
   DIV_WS_PHASE,
+  DIV_WS_CHORUS,
 
   DIV_WS_SINGLE_MAX,
   
@@ -522,7 +524,9 @@ enum DivWaveSynthEffects {
   DIV_WS_PING_PONG,
   DIV_WS_OVERLAY,
   DIV_WS_NEGATIVE_OVERLAY,
-  DIV_WS_PHASE_DUAL,
+  DIV_WS_SLIDE,
+  DIV_WS_MIX,
+  DIV_WS_PHASE_MOD,
 
   DIV_WS_DUAL_MAX
 };

src/engine/platform/es5506.cpp

@@ -115,7 +115,7 @@ const char** DivPlatformES5506::getRegisterSheet() {
 const char* DivPlatformES5506::getEffectName(unsigned char effect) {
   switch (effect) {
     case 0x10:
-      return "10xx: Change waveform";
+      return "10xx: Change waveform or sample, transwave index";
       break;
     case 0x11:
       return "11xx: Set filter mode (00 to 03)";
@@ -123,6 +123,9 @@ const char* DivPlatformES5506::getEffectName(unsigned char effect) {
     case 0x12:
       return "120x: Set pause (bit 0)";
       break;
+    case 0x13:
+      return "130x: Set transwave slice mode (bit 0)";
+      break;
     case 0x14:
       return "14xx: Set filter coefficient K1 low byte";
       break;
@@ -284,12 +287,10 @@ void DivPlatformES5506::e_pin(bool state)
             DivInstrument* ins=parent->getIns(chan[i].ins);
             if (!ins->amiga.useNoteMap && ins->amiga.transWave.enable) {
               const int next=chan[ch].pcm.next;
-              bool sampleVaild=false;
               if (next>=0 && next<ins->amiga.transWaveMap.size()) {
                 DivInstrumentAmiga::TransWaveMap& transWaveInd=ins->amiga.transWaveMap[next];
                 int sample=transWaveInd.ind;
                 if (sample>=0 && sample<parent->song.sampleLen) {
-                  sampleVaild=true;
                   chan[ch].pcm.index=sample;
                   chan[ch].transWave.ind=next;
                   DivSample* s=parent->getSample(sample);
@@ -328,8 +329,8 @@ void DivPlatformES5506::e_pin(bool state)
                   const unsigned int start=s->offES5506<<10;
                   const unsigned int length=s->samples-1;
                   const unsigned int end=start+(length<<11);
+                  const double nextFreqOffs=PITCH_OFFSET*off;
                   chan[ch].pcm.loopMode=loopMode;
-                  chan[ch].pcm.nextFreqOffs=PITCH_OFFSET*off;
                   chan[ch].pcm.reversed=reversed;
                   chan[ch].pcm.bank=(s->offES5506>>22)&3;
                   chan[ch].pcm.start=start;
@@ -359,11 +360,12 @@ void DivPlatformES5506::e_pin(bool state)
                   }
                   // Set loop mode & Bank
                   pageWriteMask(0x00|ch,0x5f,0x00,loopFlag,0xfcfc);
-                }
+                  if (chan[ch].pcm.nextFreqOffs!=nextFreqOffs) {
-              }
+                    chan[ch].pcm.nextFreqOffs=nextFreqOffs;
-              if (sampleVaild) {
                     chan[ch].noteChanged.offs=1;
                   }
+                }
+              }
               chan[ch].pcmChanged.changed=0;
             }
           }
@@ -641,7 +643,6 @@ void DivPlatformES5506::tick(bool sysTick) {
       if (!chan[i].isTransWave) {
         if (chan[i].pcmChanged.transwaveInd && (!ins->amiga.useNoteMap && ins->amiga.transWave.enable)) {
           const int next=chan[i].pcm.next;
-          bool sampleVaild=false;
           if (next>=0 && next<ins->amiga.transWaveMap.size()) {
             DivInstrumentAmiga::TransWaveMap& transWaveInd=ins->amiga.transWaveMap[next];
             int sample=transWaveInd.ind;
@@ -676,10 +677,10 @@ void DivPlatformES5506::tick(bool sysTick) {
                 if (transWaveInd.reversed!=2) {
                   reversed=transWaveInd.reversed;
                 }
+                chan[i].pcmChanged.slice=1;
+                if ((chan[i].pcm.loopMode!=loopMode) || (chan[i].pcm.reversed!=reversed)) {
                   chan[i].pcm.loopMode=loopMode;
                   chan[i].pcm.reversed=reversed;
-                if (sampleVaild) {
-                  chan[i].pcmChanged.slice=1;
                   chan[i].pcmChanged.loopBank=1;
                 }
               }
@@ -752,20 +753,31 @@ void DivPlatformES5506::tick(bool sysTick) {
                 const unsigned int start=s->offES5506<<10;
                 const unsigned int length=s->samples-1;
                 const unsigned int end=start+(length<<11);
+                const unsigned int nextBank=(s->offES5506>>22)&3;
+                const double nextFreqOffs=PITCH_OFFSET*off;
                 chan[i].pcm.loopMode=loopMode;
-                chan[i].pcm.nextFreqOffs=PITCH_OFFSET*off;
                 chan[i].pcm.reversed=reversed;
-                chan[i].pcm.bank=(s->offES5506>>22)&3;
+                chan[i].pcm.bank=nextBank;
                 chan[i].pcm.start=start;
                 chan[i].pcm.end=end;
                 chan[i].pcm.length=length;
-                chan[i].keyOn=true;
+                if ((chan[i].pcm.loopMode!=loopMode) || (chan[i].pcm.reversed!=reversed) || (chan[i].pcm.bank!=nextBank)) {
+                  chan[i].pcm.loopMode=loopMode;
+                  chan[i].pcm.reversed=reversed;
+                  chan[i].pcm.bank=nextBank;
+                  chan[i].pcmChanged.loopBank=1;
+                }
+                if (chan[i].pcm.nextFreqOffs!=nextFreqOffs) {
+                  chan[i].pcm.nextFreqOffs=nextFreqOffs;
+                  chan[i].noteChanged.offs=1;
+                }
               }
             }
             if (sampleVaild) {
+              if (!chan[i].keyOn) {
+                pageWrite(0x20|i,0x03,(chan[i].pcm.reversed)?chan[i].pcm.end:chan[i].pcm.start);
+              }
               chan[i].pcmChanged.slice=1;
-              chan[i].pcmChanged.loopBank=1;
-              chan[i].noteChanged.offs=1;
             }
             chan[i].pcmChanged.index=0;
           }
@@ -783,11 +795,15 @@ void DivPlatformES5506::tick(bool sysTick) {
                   loopEnd=chan[i].transWave.sliceEnd;
                 }
                 const unsigned int start=s->offES5506<<10;
+                const unsigned int nextLoopStart=(start+(unsigned int)(loopStart*2048.0))&0xfffff800;
+                const unsigned int nextLoopEnd=(start+(unsigned int)((loopEnd-1.0)*2048.0))&0xffffff80;
+                if ((chan[i].pcm.loopStart!=nextLoopStart) || (chan[i].pcm.loopEnd!=nextLoopEnd)) {
                   chan[i].pcm.loopStart=(start+(unsigned int)(loopStart*2048.0))&0xfffff800;
                   chan[i].pcm.loopEnd=(start+(unsigned int)((loopEnd-1.0)*2048.0))&0xffffff80;
                   chan[i].pcmChanged.position=1;
                 }
               }
+            }
             chan[i].pcmChanged.slice=0;
           }
           if (chan[i].pcmChanged.position) {
@@ -867,7 +883,7 @@ void DivPlatformES5506::tick(bool sysTick) {
       }
       chan[i].envChanged.changed=0;
     }
-    if (chan[i].noteChanged.changed) {
+    if (chan[i].noteChanged.changed) { // note value changed or frequency offset is changed
       if (chan[i].noteChanged.offs) {
         if (chan[i].pcm.freqOffs!=chan[i].pcm.nextFreqOffs) {
           chan[i].pcm.freqOffs=chan[i].pcm.nextFreqOffs;
@@ -879,7 +895,7 @@ void DivPlatformES5506::tick(bool sysTick) {
         }
         chan[i].noteChanged.offs=0;
       }
-      if (chan[i].noteChanged.note) { // note value changed or frequency offset is changed
+      if (chan[i].noteChanged.note) {
         if (chan[i].prevNote!=chan[i].nextNote) {
           chan[i].prevNote=chan[i].nextNote;
           const int nextFreq=NOTE_ES5506(i,chan[i].nextNote);
@@ -1001,7 +1017,7 @@ int DivPlatformES5506::dispatch(DivCommand c) {
         }
         if (sample>=0 && sample<parent->song.sampleLen) {
           sampleVaild=true;
-          chan[c.chan].pcm.index=sample;
+          chan[c.chan].pcm.index=chan[c.chan].pcm.next=sample;
           chan[c.chan].pcm.pause=(chan[c.chan].std.alg.will)?(chan[c.chan].std.alg.val&1):false;
           chan[c.chan].pcm.isNoteMap=ins->amiga.useNoteMap && !ins->amiga.transWave.enable;
           chan[c.chan].transWave.enable=!ins->amiga.useNoteMap && ins->amiga.transWave.enable;
@@ -1067,7 +1083,7 @@ int DivPlatformES5506::dispatch(DivCommand c) {
         }
       }
       if (!sampleVaild) {
-        chan[c.chan].pcm.index=-1;
+        chan[c.chan].pcm.index=chan[c.chan].pcm.next=-1;
         chan[c.chan].filter=DivInstrumentES5506::Filter();
         chan[c.chan].envelope=DivInstrumentES5506::Envelope();
       }
@@ -1153,9 +1169,36 @@ int DivPlatformES5506::dispatch(DivCommand c) {
       chan[c.chan].pitch=c.value;
       chan[c.chan].freqChanged=true;
       break;
+    // sample commands
     case DIV_CMD_WAVE:
+      if (!chan[c.chan].useWave) {
+        if (chan[c.chan].active) {
+          if (((ins->amiga.useNoteMap && !ins->amiga.transWave.enable) && (c.value>=0 && c.value<120)) ||
+              ((!ins->amiga.useNoteMap && ins->amiga.transWave.enable) && (c.value>=0 && c.value<ins->amiga.transWaveMap.size())) ||
+              ((!ins->amiga.useNoteMap && !ins->amiga.transWave.enable) && (c.value>=0 && c.value<parent->song.sampleLen))) {
+            chan[c.chan].pcm.next=c.value;
+            if (!ins->amiga.useNoteMap && ins->amiga.transWave.enable) {
+              chan[c.chan].pcmChanged.transwaveInd=1;
+            } else {
+              chan[c.chan].pcmChanged.index=1;
+            }
+          }
+        }
+      }
       // reserved for useWave
       break;
+    case DIV_CMD_SAMPLE_TRANSWAVE_SLICE_MODE:
+      if (chan[c.chan].transWave.sliceEnable!=(bool)(c.value&1)) {
+        chan[c.chan].transWave.sliceEnable=c.value&1;
+        chan[c.chan].pcmChanged.slice=1;
+      }
+      break;
+    case DIV_CMD_SAMPLE_TRANSWAVE_SLICE_POS:
+      if (chan[c.chan].transWave.sliceEnable && (chan[c.chan].transWave.slice!=(unsigned short)(c.value&0xfff))) {
+        chan[c.chan].transWave.slice=c.value&0xfff;
+        chan[c.chan].pcmChanged.slice=1;
+      }
+      break;
     // Filter commands
     case DIV_CMD_ES5506_FILTER_MODE:
       chan[c.chan].filter.mode=DivInstrumentES5506::Filter::FilterMode(c.value&3);

src/engine/platform/es5506.h

@@ -128,7 +128,7 @@ class DivPlatformES5506: public DivDispatch, public es550x_intf {
         changed(0) {}
     } envChanged;
 
-    struct PcmChanged {
+    struct PCMChanged {
       union {
         struct {
           unsigned char index: 1; // sample index
@@ -136,7 +136,7 @@ class DivPlatformES5506: public DivDispatch, public es550x_intf {
           unsigned char position: 1; // sample position in memory
           unsigned char loopBank: 1; // Loop mode and Bank
           unsigned char transwaveInd: 1; // transwave index
-          unsigned char dummy: 4; // dummy for bit padding
+          unsigned char dummy: 3; // dummy for bit padding
         };
         unsigned char changed;
       };

src/engine/platform/genesis.cpp

@@ -438,7 +438,17 @@ void DivPlatformGenesis::tick(bool sysTick) {
         rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
       }
     }
+  }
 
+  for (int i=0; i<512; i++) {
+    if (pendingWrites[i]!=oldWrites[i]) {
+      immWrite(i,pendingWrites[i]&0xff);
+      oldWrites[i]=pendingWrites[i];
+    }
+  }
+
+  for (int i=0; i<6; i++) {
+    if (i==2 && extMode) continue;
     if (chan[i].keyOn || chan[i].keyOff) {
       if (chan[i].hardReset && chan[i].keyOn) {
         for (int j=0; j<4; j++) {
@@ -463,20 +473,14 @@ void DivPlatformGenesis::tick(bool sysTick) {
     }
   }
 
-  for (int i=0; i<512; i++) {
-    if (pendingWrites[i]!=oldWrites[i]) {
-      immWrite(i,pendingWrites[i]&0xff);
-      oldWrites[i]=pendingWrites[i];
-    }
-  }
 
   for (int i=0; i<6; i++) {
     if (i==2 && extMode) continue;
     if (chan[i].freqChanged) {
       if (parent->song.linearPitch==2) {
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
       } else {
-        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,4,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+        int fNum=parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE,11);
         int block=(chan[i].baseFreq&0xf800)>>11;
         if (fNum<0) fNum=0;
         if (fNum>2047) {
@@ -501,7 +505,7 @@ void DivPlatformGenesis::tick(bool sysTick) {
             off=(double)s->centerRate/8363.0;
           }
         }
-        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,4,chan[i].pitch2,1,1);
+        chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,1,1);
         dacRate=chan[i].freq*off;
         if (dacRate<1) dacRate=1;
         if (dumpWrites) addWrite(0xffff0001,dacRate);
@@ -1152,14 +1156,12 @@ void DivPlatformGenesis::setYMFM(bool use) {
 }
 
 void DivPlatformGenesis::setFlags(unsigned int flags) {
-  if (flags==3) {
+  switch (flags) {
-    chipClock=COLOR_NTSC*12.0/7.0;
+    case 1: chipClock=COLOR_PAL*12.0/7.0; break;
-  } else if (flags==2) {
+    case 2: chipClock=8000000.0; break;
-    chipClock=8000000.0;
+    case 3: chipClock=COLOR_NTSC*12.0/7.0; break;
-  } else if (flags==1) {
+    case 4: chipClock=COLOR_NTSC*9.0/4.0; break;
-    chipClock=COLOR_PAL*12.0/7.0;
+    default: chipClock=COLOR_NTSC*15.0/7.0; break;
-  } else {
-    chipClock=COLOR_NTSC*15.0/7.0;
   }
   ladder=flags&0x80000000;
   OPN2_SetChipType(ladder?ym3438_mode_ym2612:0);

src/engine/platform/genesisext.cpp

@@ -461,9 +461,9 @@ void DivPlatformGenesisExt::tick(bool sysTick) {
   if (extMode) for (int i=0; i<4; i++) {
     if (opChan[i].freqChanged) {
       if (parent->song.linearPitch==2) {
-        opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,4,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
+        opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,false,2,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
       } else {
-        int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,4,opChan[i].pitch2);
+        int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,false,2,opChan[i].pitch2);
         int block=(opChan[i].baseFreq&0xf800)>>11;
         if (fNum<0) fNum=0;
         if (fNum>2047) {

src/engine/platform/n163.cpp

@@ -358,7 +358,7 @@ void DivPlatformN163::tick(bool sysTick) {
     }
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
       // TODO: what is this mess?
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,0,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       chan[i].freq=(((chan[i].freq*chan[i].waveLen)*(chanMax+1))/16);
       if (chan[i].freq<0) chan[i].freq=0;
       if (chan[i].freq>0x3ffff) chan[i].freq=0x3ffff;

src/engine/platform/namcowsg.cpp

@@ -0,0 +1,590 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "namcowsg.h"
+#include "../engine.h"
+#include <math.h>
+
+//#define rWrite(a,v) pendingWrites[a]=v;
+#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
+
+#define CHIP_FREQBASE 4194304
+
+const char* regCheatSheetNamcoWSG[]={
+  "WaveSel0", "05",
+  "WaveSel1", "0A",
+  "WaveSel2", "0F",
+  "FreqS0", "10",
+  "FreqL0", "11",
+  "FreqM0", "12",
+  "FreqH0", "13",
+  "FreqX0", "14",
+  "Volume0", "15",
+  "FreqL1", "16",
+  "FreqM1", "17",
+  "FreqH1", "18",
+  "FreqX1", "19",
+  "Volume1", "1A",
+  "FreqL2", "1B",
+  "FreqM2", "1C",
+  "FreqH2", "1D",
+  "FreqX2", "1E",
+  "Volume2", "1F",
+  NULL
+};
+
+const char* regCheatSheetNamco15XX[]={
+  "Volume0", "03",
+  "FreqL0", "04",
+  "FreqH0", "05",
+  "WaveSel0", "06",
+
+  "Volume1", "0B",
+  "FreqL1", "0C",
+  "FreqH1", "0D",
+  "WaveSel1", "0E",
+
+  "Volume2", "13",
+  "FreqL2", "14",
+  "FreqH2", "15",
+  "WaveSel2", "16",
+
+  "Volume3", "1B",
+  "FreqL3", "1C",
+  "FreqH3", "1D",
+  "WaveSel3", "1E",
+
+  "Volume4", "23",
+  "FreqL4", "24",
+  "FreqH4", "25",
+  "WaveSel4", "26",
+
+  "Volume5", "2B",
+  "FreqL5", "2C",
+  "FreqH5", "2D",
+  "WaveSel5", "2E",
+
+  "Volume6", "33",
+  "FreqL6", "34",
+  "FreqH6", "35",
+  "WaveSel6", "36",
+
+  "Volume7", "3B",
+  "FreqL7", "3C",
+  "FreqH7", "3D",
+  "WaveSel7", "3E",
+  
+  NULL
+};
+
+const char* regCheatSheetNamcoCUS30[]={
+  "VolumeL0", "00",
+  "WaveSel0", "01",
+  "FreqH0", "02",
+  "FreqL0", "03",
+  "VolumeR0", "04",
+
+  "VolumeL1", "08",
+  "WaveSel1", "09",
+  "FreqH1", "0A",
+  "FreqL1", "0B",
+  "VolumeR1", "0C",
+
+  "VolumeL2", "10",
+  "WaveSel2", "11",
+  "FreqH2", "12",
+  "FreqL2", "13",
+  "VolumeR2", "14",
+
+  "VolumeL3", "18",
+  "WaveSel3", "19",
+  "FreqH3", "1A",
+  "FreqL3", "1B",
+  "VolumeR3", "1C",
+
+  "VolumeL4", "20",
+  "WaveSel4", "21",
+  "FreqH4", "22",
+  "FreqL4", "23",
+  "VolumeR4", "24",
+
+  "VolumeL5", "28",
+  "WaveSel5", "29",
+  "FreqH5", "2A",
+  "FreqL5", "2B",
+  "VolumeR5", "2C",
+
+  "VolumeL6", "30",
+  "WaveSel6", "31",
+  "FreqH6", "32",
+  "FreqL6", "33",
+  "VolumeR6", "34",
+
+  "VolumeL7", "38",
+  "WaveSel7", "39",
+  "FreqH7", "3A",
+  "FreqL7", "3B",
+  "VolumeR7", "3C",
+  
+  NULL
+};
+
+const char** DivPlatformNamcoWSG::getRegisterSheet() {
+  if (devType==30) return regCheatSheetNamcoCUS30;
+  if (devType==15) return regCheatSheetNamco15XX;
+  return regCheatSheetNamcoWSG;
+}
+
+const char* DivPlatformNamcoWSG::getEffectName(unsigned char effect) {
+  switch (effect) {
+    case 0x10:
+      return "10xx: Change waveform";
+      break;
+    case 0x11:
+      return "11xx: Toggle noise mode";
+      break;
+  }
+  return NULL;
+}
+
+void DivPlatformNamcoWSG::acquire(short* bufL, short* bufR, size_t start, size_t len) {
+  short* buf[2]={
+    bufL+start, bufR+start
+  };
+  while (!writes.empty()) {
+    QueuedWrite w=writes.front();
+    switch (devType) {
+      case 1:
+        ((namco_device*)namco)->pacman_sound_w(w.addr,w.val);
+        break;
+      case 2:
+        ((namco_device*)namco)->polepos_sound_w(w.addr,w.val);
+        break;
+      case 15:
+        ((namco_15xx_device*)namco)->sharedram_w(w.addr,w.val);
+        break;
+      case 30:
+        ((namco_cus30_device*)namco)->namcos1_cus30_w(w.addr,w.val);
+        break;
+    }
+    regPool[w.addr&0x3f]=w.val;
+    writes.pop();
+  }
+  namco->sound_stream_update(buf,len);
+}
+
+void DivPlatformNamcoWSG::updateWave(int ch) {
+  if (devType==30) {
+    for (int i=0; i<32; i++) {
+      ((namco_cus30_device*)namco)->namcos1_cus30_w(i+ch*32,chan[ch].ws.output[i]);
+    }
+  } else {
+    for (int i=0; i<32; i++) {
+      namco->update_namco_waveform(i+ch*32,chan[ch].ws.output[i]);
+    }
+  }
+}
+
+void DivPlatformNamcoWSG::tick(bool sysTick) {
+  for (int i=0; i<chans; i++) {
+    chan[i].std.next();
+    if (chan[i].std.vol.had) {
+      chan[i].outVol=((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))>>4;
+    }
+    if (chan[i].std.duty.had && i>=4) {
+      chan[i].noise=chan[i].std.duty.val;
+      chan[i].freqChanged=true;
+    }
+    if (chan[i].std.arp.had) {
+      if (!chan[i].inPorta) {
+        if (chan[i].std.arp.mode) {
+          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
+        } else {
+          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
+        }
+      }
+      chan[i].freqChanged=true;
+    } else {
+      if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
+        chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
+        chan[i].freqChanged=true;
+      }
+    }
+    if (chan[i].std.wave.had) {
+      if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
+        chan[i].wave=chan[i].std.wave.val;
+        chan[i].ws.changeWave1(chan[i].wave);
+        if (!chan[i].keyOff) chan[i].keyOn=true;
+      }
+    }
+    if (chan[i].std.panL.had) {
+      chan[i].pan&=0x0f;
+      chan[i].pan|=(chan[i].std.panL.val&15)<<4;
+    }
+    if (chan[i].std.panR.had) {
+      chan[i].pan&=0xf0;
+      chan[i].pan|=chan[i].std.panR.val&15;
+    }
+    if (chan[i].std.pitch.had) {
+      if (chan[i].std.pitch.mode) {
+        chan[i].pitch2+=chan[i].std.pitch.val;
+        CLAMP_VAR(chan[i].pitch2,-2048,2048);
+      } else {
+        chan[i].pitch2=chan[i].std.pitch.val;
+      }
+      chan[i].freqChanged=true;
+    }
+    if (chan[i].active) {
+      if (chan[i].ws.tick() || (chan[i].std.phaseReset.had && chan[i].std.phaseReset.val==1)) {
+        updateWave(i);
+      }
+    }
+    if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
+      //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_PCE);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      if (chan[i].freq>1048575) chan[i].freq=1048575;
+      if (chan[i].keyOn) {
+      }
+      if (chan[i].keyOff) {
+      }
+      if (chan[i].keyOn) chan[i].keyOn=false;
+      if (chan[i].keyOff) chan[i].keyOff=false;
+      chan[i].freqChanged=false;
+    }
+  }
+
+  // update state
+  switch (devType) {
+    case 1:
+      if (chan[0].active && !isMuted[0]) {
+        rWrite(0x15,chan[0].outVol);
+      } else {
+        rWrite(0x15,0);
+      }
+      if (chan[1].active && !isMuted[1]) {
+        rWrite(0x1a,chan[1].outVol);
+      } else {
+        rWrite(0x1a,0);
+      }
+      if (chan[2].active && !isMuted[2]) {
+        rWrite(0x1f,chan[2].outVol);
+      } else {
+        rWrite(0x1f,0);
+      }
+
+      rWrite(0x10,(chan[0].freq)&15);
+      rWrite(0x11,(chan[0].freq>>4)&15);
+      rWrite(0x12,(chan[0].freq>>8)&15);
+      rWrite(0x13,(chan[0].freq>>12)&15);
+      rWrite(0x14,(chan[0].freq>>16)&15);
+
+      rWrite(0x16,(chan[1].freq>>4)&15);
+      rWrite(0x17,(chan[1].freq>>8)&15);
+      rWrite(0x18,(chan[1].freq>>12)&15);
+      rWrite(0x19,(chan[1].freq>>16)&15);
+
+      rWrite(0x1b,(chan[2].freq>>4)&15);
+      rWrite(0x1c,(chan[2].freq>>8)&15);
+      rWrite(0x1d,(chan[2].freq>>12)&15);
+      rWrite(0x1e,(chan[2].freq>>16)&15);
+
+      rWrite(0x05,0);
+      rWrite(0x0a,1);
+      rWrite(0x0f,2);
+      break;
+    case 15:
+      for (int i=0; i<8; i++) {
+        if (chan[i].active && !isMuted[i]) {
+          rWrite((i<<3)+0x03,chan[i].outVol);
+        } else {
+          rWrite((i<<3)+0x03,0);
+        }
+        rWrite((i<<3)+0x04,chan[i].freq&0xff);
+        rWrite((i<<3)+0x05,(chan[i].freq>>8)&0xff);
+        rWrite((i<<3)+0x06,((chan[i].freq>>15)&15)|(i<<4));
+      }
+      break;
+    case 30:
+      for (int i=0; i<8; i++) {
+        if (chan[i].active && !isMuted[i]) {
+          rWrite((i<<3)+0x100,(chan[i].outVol*((chan[i].pan>>4)&15))/15);
+          rWrite((i<<3)+0x104,((chan[i].outVol*(chan[i].pan&15))/15)|(chan[(i+1)&7].noise?0x80:0));
+        } else {
+          rWrite((i<<3)+0x100,0);
+          rWrite((i<<3)+0x104,(chan[(i+1)&7].noise?0x80:0));
+        }
+        rWrite((i<<3)+0x103,chan[i].freq&0xff);
+        rWrite((i<<3)+0x102,(chan[i].freq>>8)&0xff);
+        rWrite((i<<3)+0x101,((chan[i].freq>>15)&15)|(i<<4));
+      }
+      break;
+  }
+}
+
+int DivPlatformNamcoWSG::dispatch(DivCommand c) {
+  switch (c.cmd) {
+    case DIV_CMD_NOTE_ON: {
+      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_PCE);
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+        chan[c.chan].freqChanged=true;
+        chan[c.chan].note=c.value;
+      }
+      chan[c.chan].active=true;
+      chan[c.chan].keyOn=true;
+      chan[c.chan].macroInit(ins);
+      if (chan[c.chan].wave<0) {
+        chan[c.chan].wave=0;
+        chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+      }
+      chan[c.chan].ws.init(ins,32,15,chan[c.chan].insChanged);
+      chan[c.chan].insChanged=false;
+      break;
+    }
+    case DIV_CMD_NOTE_OFF:
+      chan[c.chan].active=false;
+      chan[c.chan].keyOff=true;
+      chan[c.chan].macroInit(NULL);
+      break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_INSTRUMENT:
+      if (chan[c.chan].ins!=c.value || c.value2==1) {
+        chan[c.chan].ins=c.value;
+        chan[c.chan].insChanged=true;
+      }
+      break;
+    case DIV_CMD_VOLUME:
+      if (chan[c.chan].vol!=c.value) {
+        chan[c.chan].vol=c.value;
+        if (!chan[c.chan].std.vol.has) {
+          chan[c.chan].outVol=c.value;
+        }
+      }
+      break;
+    case DIV_CMD_GET_VOLUME:
+      if (chan[c.chan].std.vol.has) {
+        return chan[c.chan].vol;
+      }
+      return chan[c.chan].outVol;
+      break;
+    case DIV_CMD_PITCH:
+      chan[c.chan].pitch=c.value;
+      chan[c.chan].freqChanged=true;
+      break;
+    case DIV_CMD_WAVE:
+      chan[c.chan].wave=c.value;
+      chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+      chan[c.chan].keyOn=true;
+      break;
+    case DIV_CMD_NOTE_PORTA: {
+      int destFreq=NOTE_FREQUENCY(c.value2);
+      bool return2=false;
+      if (destFreq>chan[c.chan].baseFreq) {
+        chan[c.chan].baseFreq+=c.value*((parent->song.linearPitch==2)?1:8);
+        if (chan[c.chan].baseFreq>=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      } else {
+        chan[c.chan].baseFreq-=c.value*((parent->song.linearPitch==2)?1:8);
+        if (chan[c.chan].baseFreq<=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      }
+      chan[c.chan].freqChanged=true;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
+      break;
+    }
+    case DIV_CMD_STD_NOISE_MODE:
+      chan[c.chan].noise=c.value;
+      break;
+    case DIV_CMD_PANNING: {
+      chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
+      break;
+    }
+    case DIV_CMD_LEGATO:
+      chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val):(0)));
+      chan[c.chan].freqChanged=true;
+      chan[c.chan].note=c.value;
+      break;
+    case DIV_CMD_PRE_PORTA:
+      if (chan[c.chan].active && c.value2) {
+        if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_PCE));
+      }
+      chan[c.chan].inPorta=c.value;
+      break;
+    case DIV_CMD_GET_VOLMAX:
+      return 15;
+      break;
+    case DIV_ALWAYS_SET_VOLUME:
+      return 1;
+      break;
+    default:
+      break;
+  }
+  return 1;
+}
+
+void DivPlatformNamcoWSG::muteChannel(int ch, bool mute) {
+  isMuted[ch]=mute;
+}
+
+void DivPlatformNamcoWSG::forceIns() {
+  for (int i=0; i<chans; i++) {
+    chan[i].insChanged=true;
+    chan[i].freqChanged=true;
+    updateWave(i);
+  }
+}
+
+void* DivPlatformNamcoWSG::getChanState(int ch) {
+  return &chan[ch];
+}
+
+DivDispatchOscBuffer* DivPlatformNamcoWSG::getOscBuffer(int ch) {
+  return oscBuf[ch];
+}
+
+unsigned char* DivPlatformNamcoWSG::getRegisterPool() {
+  return regPool;
+}
+
+int DivPlatformNamcoWSG::getRegisterPoolSize() {
+  return (devType==1)?32:64;
+}
+
+void DivPlatformNamcoWSG::reset() {
+  while (!writes.empty()) writes.pop();
+  memset(regPool,0,128);
+  for (int i=0; i<chans; i++) {
+    chan[i]=DivPlatformNamcoWSG::Channel();
+    chan[i].std.setEngine(parent);
+    chan[i].ws.setEngine(parent);
+    chan[i].ws.init(NULL,32,15,false);
+  }
+  if (dumpWrites) {
+    addWrite(0xffffffff,0);
+  }
+  // TODO: wave memory
+  namco->set_voices(chans);
+  namco->set_stereo((devType==2 || devType==30));
+  namco->device_start(NULL);
+  lastPan=0xff;
+  cycles=0;
+  curChan=-1;
+}
+
+bool DivPlatformNamcoWSG::isStereo() {
+  return (devType==30);
+}
+
+bool DivPlatformNamcoWSG::keyOffAffectsArp(int ch) {
+  return true;
+}
+
+void DivPlatformNamcoWSG::notifyWaveChange(int wave) {
+  for (int i=0; i<chans; i++) {
+    if (chan[i].wave==wave) {
+      chan[i].ws.changeWave1(wave);
+      updateWave(i);
+    }
+  }
+}
+
+void DivPlatformNamcoWSG::notifyInsDeletion(void* ins) {
+  for (int i=0; i<chans; i++) {
+    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
+  }
+}
+
+void DivPlatformNamcoWSG::setDeviceType(int type) {
+  devType=type;
+  switch (type) {
+    case 15:
+      chans=8;
+      break;
+    case 30:
+      chans=8;
+      break;
+    case 1:
+      chans=3;
+      break;
+    case 2:
+      chans=8;
+      break;
+  }
+}
+
+void DivPlatformNamcoWSG::setFlags(unsigned int flags) {
+  chipClock=3072000;
+  rate=chipClock/32;
+  namco->device_clock_changed(rate);
+  for (int i=0; i<chans; i++) {
+    oscBuf[i]->rate=rate;
+  }
+}
+
+void DivPlatformNamcoWSG::poke(unsigned int addr, unsigned short val) {
+  rWrite(addr,val);
+}
+
+void DivPlatformNamcoWSG::poke(std::vector<DivRegWrite>& wlist) {
+  for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
+}
+
+int DivPlatformNamcoWSG::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
+  parent=p;
+  dumpWrites=false;
+  skipRegisterWrites=false;
+  for (int i=0; i<chans; i++) {
+    isMuted[i]=false;
+    oscBuf[i]=new DivDispatchOscBuffer;
+  }
+  switch (devType) {
+    case 15:
+      namco=new namco_15xx_device(3072000);
+      break;
+    case 30:
+      namco=new namco_cus30_device(3072000);
+      break;
+    default:
+      namco=new namco_device(3072000);
+      break;
+  }
+  setFlags(flags);
+  reset();
+  return 6;
+}
+
+void DivPlatformNamcoWSG::quit() {
+  for (int i=0; i<chans; i++) {
+    delete oscBuf[i];
+  }
+  delete namco;
+}
+
+DivPlatformNamcoWSG::~DivPlatformNamcoWSG() {
+}

src/engine/platform/namcowsg.h

@@ -0,0 +1,104 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _NAMCOWSG_H
+#define _NAMCOWSG_H
+
+#include "../dispatch.h"
+#include <queue>
+#include "../macroInt.h"
+#include "../waveSynth.h"
+#include "sound/namco.h"
+
+class DivPlatformNamcoWSG: public DivDispatch {
+  struct Channel {
+    int freq, baseFreq, pitch, pitch2, note;
+    int ins;
+    unsigned char pan;
+    bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, noise;
+    signed char vol, outVol, wave;
+    DivMacroInt std;
+    DivWaveSynth ws;
+    void macroInit(DivInstrument* which) {
+      std.init(which);
+      pitch2=0;
+    }
+    Channel():
+      freq(0),
+      baseFreq(0),
+      pitch(0),
+      pitch2(0),
+      note(0),
+      ins(-1),
+      pan(255),
+      active(false),
+      insChanged(true),
+      freqChanged(false),
+      keyOn(false),
+      keyOff(false),
+      inPorta(false),
+      noise(false),
+      vol(15),
+      outVol(15),
+      wave(-1) {}
+  };
+  Channel chan[8];
+  DivDispatchOscBuffer* oscBuf[8];
+  bool isMuted[8];
+  struct QueuedWrite {
+      unsigned short addr;
+      unsigned char val;
+      QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v) {}
+  };
+  std::queue<QueuedWrite> writes;
+  unsigned char lastPan;
+
+  int cycles, curChan, delay;
+  namco_audio_device* namco;
+  int devType, chans;
+  unsigned char regPool[512];
+  void updateWave(int ch);
+  friend void putDispatchChan(void*,int,int);
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    bool keyOffAffectsArp(int ch);
+    void setDeviceType(int type);
+    void setFlags(unsigned int flags);
+    void notifyWaveChange(int wave);
+    void notifyInsDeletion(void* ins);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void quit();
+    ~DivPlatformNamcoWSG();
+};
+
+#endif

src/engine/platform/opl.cpp

@@ -286,8 +286,8 @@ void DivPlatformOPL::acquire_nuked(short* bufL, short* bufR, size_t start, size_
       adpcmB->output<2>(aOut,0);
 
       if (!isMuted[adpcmChan]) {
-        os[0]+=aOut.data[0];
+        os[0]-=aOut.data[0]>>3;
-        os[1]+=aOut.data[0];
+        os[1]-=aOut.data[0]>>3;
         oscBuf[adpcmChan]->data[oscBuf[adpcmChan]->needle++]+=aOut.data[0];
       } else {
         oscBuf[adpcmChan]->data[oscBuf[adpcmChan]->needle++]=0;
@@ -594,7 +594,7 @@ void DivPlatformOPL::tick(bool sysTick) {
   bool updateDrums=false;
   for (int i=0; i<totalChans; i++) {
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq)*2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].fixedFreq>0) chan[i].freq=chan[i].fixedFreq;
       if (chan[i].freq>131071) chan[i].freq=131071;
       int freqt=toFreq(chan[i].freq)+chan[i].pitch2;
@@ -734,12 +734,12 @@ int DivPlatformOPL::dispatch(DivCommand c) {
           chan[c.chan].sample=ins->amiga.getSample(c.value);
           if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
             DivSample* s=parent->getSample(chan[c.chan].sample);
-            immWrite(9,(s->offB>>2)&0xff);
+            immWrite(9,(s->offB>>5)&0xff);
-            immWrite(10,(s->offB>>10)&0xff);
+            immWrite(10,(s->offB>>13)&0xff);
             int end=s->offB+s->lengthB-1;
-            immWrite(11,(end>>2)&0xff);
+            immWrite(11,(end>>5)&0xff);
-            immWrite(12,(end>>10)&0xff);
+            immWrite(12,(end>>13)&0xff);
-            immWrite(8,2);
+            immWrite(8,1);
             immWrite(7,(s->loopStart>=0)?0xb0:0xa0); // start/repeat
             if (c.value!=DIV_NOTE_NULL) {
               chan[c.chan].note=c.value;
@@ -774,7 +774,7 @@ int DivPlatformOPL::dispatch(DivCommand c) {
           int end=s->offB+s->lengthB-1;
           immWrite(11,(end>>2)&0xff);
           immWrite(12,(end>>10)&0xff);
-          immWrite(8,2);
+          immWrite(8,1);
           immWrite(7,(s->loopStart>=0)?0xb0:0xa0); // start/repeat
           int freq=(65536.0*(double)s->rate)/(double)rate;
           immWrite(16,freq&0xff);
@@ -1698,7 +1698,7 @@ int DivPlatformOPL::init(DivEngine* p, int channels, int sugRate, unsigned int f
     adpcmBMemLen=0;
     iface.adpcmBMem=adpcmBMem;
     iface.sampleBank=0;
-    adpcmB=new ymfm::adpcm_b_engine(iface,2);
+    adpcmB=new ymfm::adpcm_b_engine(iface,5);
   }
 
   reset();

src/engine/platform/opll.cpp

@@ -300,7 +300,7 @@ void DivPlatformOPLL::tick(bool sysTick) {
 
   for (int i=0; i<11; i++) {
     if (chan[i].freqChanged) {
-      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq),chan[i].pitch2,chipClock,CHIP_FREQBASE);
+      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq)*2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
       if (chan[i].fixedFreq>0) chan[i].freq=chan[i].fixedFreq;
       if (chan[i].freq>262143) chan[i].freq=262143;
       int freqt=toFreq(chan[i].freq)+chan[i].pitch2;

src/engine/platform/rf5c68.cpp

@@ -0,0 +1,434 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "rf5c68.h"
+#include "../engine.h"
+#include "../../ta-log.h"
+#include <math.h>
+
+#define rWrite(a,v) {if(!skipRegisterWrites) {rf5c68.rf5c68_w(a,v); regPool[a]=v; if(dumpWrites) addWrite(a,v);}}
+
+#define CHIP_FREQBASE 786432
+
+const char* regCheatSheetRF5C68[]={
+  "Volume", "0",
+  "Panning", "1",
+  "FreqL", "2",
+  "FreqH", "3",
+  "LoopStartL", "4",
+  "LoopStartH", "5",
+  "StartH", "6",
+  "Control", "7",
+  "Disable", "8",
+  NULL
+};
+
+const char** DivPlatformRF5C68::getRegisterSheet() {
+  return regCheatSheetRF5C68;
+}
+
+const char* DivPlatformRF5C68::getEffectName(unsigned char effect) {
+  return NULL;
+}
+
+void DivPlatformRF5C68::chWrite(unsigned char ch, unsigned int addr, unsigned char val) {
+  if (!skipRegisterWrites) {
+    if (curChan!=ch) {
+      curChan=ch;
+      rWrite(7,curChan|0xc0);
+    }
+    regPool[16+((ch)<<4)+((addr)&0x0f)]=val;
+    rWrite(addr,val);
+  }
+}
+
+void DivPlatformRF5C68::acquire(short* bufL, short* bufR, size_t start, size_t len) {
+  short buf[16][256];
+  short* chBufPtrs[16]={
+    buf[0],buf[1],buf[2],buf[3],buf[4],buf[5],buf[6],buf[7],
+    buf[8],buf[9],buf[10],buf[11],buf[12],buf[13],buf[14],buf[15]
+  };
+  size_t pos=start;
+  while (len > 0) {
+    size_t blockLen=MIN(len,256);
+    short* bufPtrs[2]={&bufL[pos],&bufR[pos]};
+    rf5c68.sound_stream_update(bufPtrs,chBufPtrs,blockLen);
+    for (int i=0; i<8; i++) {
+      for (size_t j=0; j<blockLen; j++) {
+        oscBuf[i]->data[oscBuf[i]->needle++]=buf[i*2][j]+buf[i*2+1][j];
+      }
+    }
+    pos+=blockLen;
+    len-=blockLen;
+  }
+}
+
+void DivPlatformRF5C68::tick(bool sysTick) {
+  for (int i=0; i<8; i++) {
+    chan[i].std.next();
+    if (chan[i].std.vol.had) {
+      chan[i].outVol=((chan[i].vol&0xff)*chan[i].std.vol.val)>>6;
+      chWrite(i,0,chan[i].outVol);
+    }
+    if (chan[i].std.arp.had) {
+      if (!chan[i].inPorta) {
+        if (chan[i].std.arp.mode) {
+          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
+        } else {
+          chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+chan[i].std.arp.val);
+        }
+      }
+      chan[i].freqChanged=true;
+    } else {
+      if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
+        chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
+        chan[i].freqChanged=true;
+      }
+    }
+    if (chan[i].std.pitch.had) {
+      if (chan[i].std.pitch.mode) {
+        chan[i].pitch2+=chan[i].std.pitch.val;
+        CLAMP_VAR(chan[i].pitch2,-2048,2048);
+      } else {
+        chan[i].pitch2=chan[i].std.pitch.val;
+      }
+      chan[i].freqChanged=true;
+    }
+    // panning registers are reversed in this chip
+    if (chan[i].std.panL.had) {
+      chan[i].panning&=0xf0;
+      chan[i].panning|=chan[i].std.panL.val&15;
+    }
+    if (chan[i].std.panR.had) {
+      chan[i].panning&=0x0f;
+      chan[i].panning|=(chan[i].std.panR.val&15)<<4;
+    }
+    if (chan[i].std.panL.had || chan[i].std.panR.had) {
+      chWrite(i,0x05,isMuted[i]?0:chan[i].panning);
+    }
+    if (chan[i].setPos) {
+      // force keyon
+      chan[i].keyOn=true;
+      chan[i].setPos=false;
+    } else {
+      chan[i].audPos=0;
+    }
+    if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
+      unsigned char keyon=regPool[8]&~(1<<i);
+      unsigned char keyoff=keyon|(1<<i);
+      DivSample* s=parent->getSample(chan[i].sample);
+      double off=(s->centerRate>=1)?((double)s->centerRate/8363.0):1.0;
+      chan[i].freq=(int)(off*parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE));
+      if (chan[i].freq>65535) chan[i].freq=65535;
+      if (chan[i].keyOn) {
+        unsigned int start=s->offRF5C68;
+        unsigned int loop=start+s->length8;
+        if (chan[i].audPos>0) {
+          start=start+MIN(chan[i].audPos,s->length8);
+        }
+        if (s->loopStart>=0) {
+          loop=start+s->loopStart;
+        }
+        start=MIN(start,getSampleMemCapacity()-31);
+        loop=MIN(loop,getSampleMemCapacity()-31);
+        rWrite(8,keyoff); // force keyoff first
+        chWrite(i,6,start>>8);
+        chWrite(i,4,loop&0xff);
+        chWrite(i,5,loop>>8);
+        if (!chan[i].std.vol.had) {
+          chan[i].outVol=chan[i].vol;
+          chWrite(i,0,chan[i].outVol);
+        }
+        rWrite(8,keyon);
+        chan[i].keyOn=false;
+      }
+      if (chan[i].keyOff) {
+        rWrite(8,keyoff);
+        chan[i].keyOff=false;
+      }
+      if (chan[i].freqChanged) {
+        chWrite(i,2,chan[i].freq&0xff);
+        chWrite(i,3,chan[i].freq>>8);
+        chan[i].freqChanged=false;
+      }
+    }
+  }
+}
+
+int DivPlatformRF5C68::dispatch(DivCommand c) {
+  switch (c.cmd) {
+    case DIV_CMD_NOTE_ON: {
+      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA);
+      chan[c.chan].sample=ins->amiga.getSample(c.value);
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
+      }
+      if (chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
+        chan[c.chan].sample=-1;
+      }
+      if (c.value!=DIV_NOTE_NULL) {
+        chan[c.chan].freqChanged=true;
+        chan[c.chan].note=c.value;
+      }
+      chan[c.chan].active=true;
+      chan[c.chan].keyOn=true;
+      chan[c.chan].macroInit(ins);
+      break;
+    }
+    case DIV_CMD_NOTE_OFF:
+      chan[c.chan].sample=-1;
+      chan[c.chan].active=false;
+      chan[c.chan].keyOff=true;
+      chan[c.chan].macroInit(NULL);
+      break;
+    case DIV_CMD_NOTE_OFF_ENV:
+    case DIV_CMD_ENV_RELEASE:
+      chan[c.chan].std.release();
+      break;
+    case DIV_CMD_INSTRUMENT:
+      if (chan[c.chan].ins!=c.value || c.value2==1) {
+        chan[c.chan].ins=c.value;
+      }
+      break;
+    case DIV_CMD_VOLUME:
+      if (chan[c.chan].vol!=c.value) {
+        chan[c.chan].vol=c.value;
+        if (!chan[c.chan].std.vol.has) {
+          chan[c.chan].outVol=c.value;
+          chWrite(c.chan,0,chan[c.chan].outVol);
+        }
+      }
+      break;
+    case DIV_CMD_GET_VOLUME:
+      if (chan[c.chan].std.vol.has) {
+        return chan[c.chan].vol;
+      }
+      return chan[c.chan].outVol;
+      break;
+    case DIV_CMD_PANNING:
+      chan[c.chan].panning=(c.value>>4)|(c.value2&0xf0);
+      chWrite(c.chan,1,isMuted[c.chan]?0:chan[c.chan].panning);
+      break;
+    case DIV_CMD_PITCH:
+      chan[c.chan].pitch=c.value;
+      chan[c.chan].freqChanged=true;
+      break;
+    case DIV_CMD_NOTE_PORTA: {
+      int destFreq=NOTE_FREQUENCY(c.value2);
+      bool return2=false;
+      if (destFreq>chan[c.chan].baseFreq) {
+        chan[c.chan].baseFreq+=c.value;
+        if (chan[c.chan].baseFreq>=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      } else {
+        chan[c.chan].baseFreq-=c.value;
+        if (chan[c.chan].baseFreq<=destFreq) {
+          chan[c.chan].baseFreq=destFreq;
+          return2=true;
+        }
+      }
+      chan[c.chan].freqChanged=true;
+      if (return2) {
+        chan[c.chan].inPorta=false;
+        return 2;
+      }
+      break;
+    }
+    case DIV_CMD_LEGATO: {
+      chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val-12):(0)));
+      chan[c.chan].freqChanged=true;
+      chan[c.chan].note=c.value;
+      break;
+    }
+    case DIV_CMD_PRE_PORTA:
+      if (chan[c.chan].active && c.value2) {
+        if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA));
+      }
+      chan[c.chan].inPorta=c.value;
+      break;
+    case DIV_CMD_SAMPLE_POS:
+      chan[c.chan].audPos=c.value;
+      chan[c.chan].setPos=true;
+      break;
+    case DIV_CMD_GET_VOLMAX:
+      return 255;
+      break;
+    case DIV_ALWAYS_SET_VOLUME:
+      return 1;
+      break;
+    default:
+      break;
+  }
+  return 1;
+}
+
+void DivPlatformRF5C68::muteChannel(int ch, bool mute) {
+  isMuted[ch]=mute;
+  chWrite(ch,1,mute?0:chan[ch].panning);
+}
+
+void DivPlatformRF5C68::forceIns() {
+  for (int i=0; i<8; i++) {
+    chan[i].insChanged=true;
+    chan[i].freqChanged=true;
+    chan[i].sample=-1;
+  }
+}
+
+void* DivPlatformRF5C68::getChanState(int ch) {
+  return &chan[ch];
+}
+
+DivDispatchOscBuffer* DivPlatformRF5C68::getOscBuffer(int ch) {
+  return oscBuf[ch];
+}
+
+void DivPlatformRF5C68::reset() {
+  memset(regPool,0,144);
+  rf5c68.device_reset();
+  rWrite(0x08,0xff); // keyoff all channels
+  for (int i=0; i<8; i++) {
+    chan[i]=DivPlatformRF5C68::Channel();
+    chan[i].std.setEngine(parent);
+    chWrite(i,0,255);
+    chWrite(i,1,isMuted[i]?0:255);
+  }
+}
+
+bool DivPlatformRF5C68::isStereo() {
+  return true;
+}
+
+void DivPlatformRF5C68::notifyInsChange(int ins) {
+  for (int i=0; i<8; i++) {
+    if (chan[i].ins==ins) {
+      chan[i].insChanged=true;
+    }
+  }
+}
+
+void DivPlatformRF5C68::notifyWaveChange(int wave) {
+  // TODO when wavetables are added
+  // TODO they probably won't be added unless the samples reside in RAM
+}
+
+void DivPlatformRF5C68::notifyInsDeletion(void* ins) {
+  for (int i=0; i<8; i++) {
+    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
+  }
+}
+
+void DivPlatformRF5C68::setFlags(unsigned int flags) {
+  switch (flags&0x0f) {
+    case 1: chipClock=10000000; break;
+    case 2: chipClock=12500000; break;
+    default: chipClock=8000000; break;
+  }
+  chipType=flags>>4;
+  rate=chipClock/384;
+  for (int i=0; i<8; i++) {
+    oscBuf[i]->rate=rate;
+  }
+  rf5c68=(chipType==1)?rf5c164_device():rf5c68_device();
+  rf5c68.device_start(sampleMem);
+}
+
+void DivPlatformRF5C68::poke(unsigned int addr, unsigned short val) {
+  rWrite(addr&0x0f,val);
+}
+
+void DivPlatformRF5C68::poke(std::vector<DivRegWrite>& wlist) {
+  for (DivRegWrite& i: wlist) rWrite(i.addr&0x0f,i.val);
+}
+
+unsigned char* DivPlatformRF5C68::getRegisterPool() {
+  return regPool;
+}
+
+int DivPlatformRF5C68::getRegisterPoolSize() {
+  return 144;
+}
+
+const void* DivPlatformRF5C68::getSampleMem(int index) {
+  return index == 0 ? sampleMem : NULL;
+}
+
+size_t DivPlatformRF5C68::getSampleMemCapacity(int index) {
+  return index == 0 ? 65536 : 0;
+}
+
+size_t DivPlatformRF5C68::getSampleMemUsage(int index) {
+  return index == 0 ? sampleMemLen : 0;
+}
+
+void DivPlatformRF5C68::renderSamples() {
+  memset(sampleMem,0,getSampleMemCapacity());
+
+  size_t memPos=0;
+  for (int i=0; i<parent->song.sampleLen; i++) {
+    DivSample* s=parent->song.sample[i];
+    int length=s->length8;
+    int actualLength=MIN((int)(getSampleMemCapacity()-memPos)-31,length);
+    if (actualLength>0) {
+      s->offRF5C68=memPos;
+      for (int j=0; j<actualLength; j++) {
+        // convert to signed magnitude
+        signed char val=s->data8[j];
+        CLAMP_VAR(val,-127,126);
+        sampleMem[memPos++]=(val>0)?(val|0x80):(0-val);
+      }
+      // write end of sample marker
+      memset(&sampleMem[memPos],0xff,31);
+      memPos+=31;
+    }
+    if (actualLength<length) {
+      logW("out of RF5C68 PCM memory for sample %d!",i);
+      break;
+    }
+    // align memPos to 256-byte boundary
+    memPos=(memPos+0xff)&~0xff;
+  }
+  sampleMemLen=memPos;
+}
+
+int DivPlatformRF5C68::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
+  parent=p;
+  dumpWrites=false;
+  skipRegisterWrites=false;
+
+  for (int i=0; i<8; i++) {
+    isMuted[i]=false;
+    oscBuf[i]=new DivDispatchOscBuffer;
+  }
+  sampleMem=new unsigned char[getSampleMemCapacity()];
+  sampleMemLen=0;
+  setFlags(flags);
+  reset();
+  
+  return 8;
+}
+
+void DivPlatformRF5C68::quit() {
+  delete[] sampleMem;
+  for (int i=0; i<8; i++) {
+    delete oscBuf[i];
+  }
+}

src/engine/platform/rf5c68.h

@@ -0,0 +1,105 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2022 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _RF5C68_H
+#define _RF5C68_H
+
+#include "../dispatch.h"
+#include <queue>
+#include "../macroInt.h"
+#include "sound/rf5c68.h"
+
+class DivPlatformRF5C68: public DivDispatch {
+  struct Channel {
+    int freq, baseFreq, pitch, pitch2;
+    unsigned int audPos;
+    int sample, wave, ins;
+    int note;
+    int panning;
+    bool active, insChanged, freqChanged, keyOn, keyOff, inPorta, setPos;
+    int vol, outVol;
+    DivMacroInt std;
+    void macroInit(DivInstrument* which) {
+      std.init(which);
+      pitch2=0;
+    }
+    Channel():
+      freq(0),
+      baseFreq(0),
+      pitch(0),
+      pitch2(0),
+      audPos(0),
+      sample(-1),
+      ins(-1),
+      note(0),
+      panning(255),
+      active(false),
+      insChanged(true),
+      freqChanged(false),
+      keyOn(false),
+      keyOff(false),
+      inPorta(false),
+      setPos(false),
+      vol(255),
+      outVol(255) {}
+  };
+  Channel chan[8];
+  DivDispatchOscBuffer* oscBuf[8];
+  bool isMuted[8];
+  int chipType;
+  unsigned char curChan;
+
+  unsigned char* sampleMem;
+  size_t sampleMemLen;
+  rf5c68_device rf5c68;
+  unsigned char regPool[144];
+  friend void putDispatchChan(void*,int,int);
+
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void* getChanState(int chan);
+    DivDispatchOscBuffer* getOscBuffer(int chan);
+    unsigned char* getRegisterPool();
+    int getRegisterPoolSize();
+    void reset();
+    void forceIns();
+    void tick(bool sysTick=true);
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    void setChipModel(int type);
+    void notifyInsChange(int ins);
+    void notifyWaveChange(int wave);
+    void notifyInsDeletion(void* ins);
+    void setFlags(unsigned int flags);
+    void poke(unsigned int addr, unsigned short val);
+    void poke(std::vector<DivRegWrite>& wlist);
+    const char** getRegisterSheet();
+    const char* getEffectName(unsigned char effect);
+    const void* getSampleMem(int index = 0);
+    size_t getSampleMemCapacity(int index = 0);
+    size_t getSampleMemUsage(int index = 0);
+    void renderSamples();
+    int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
+    void quit();
+  private:
+    void chWrite(unsigned char ch, unsigned int addr, unsigned char val);
+};
+
+#endif

src/engine/platform/sound/ay8910.cpp

@@ -581,7 +581,7 @@ YM2203 English datasheet: http://www.appleii-box.de/APPLE2/JonasCard/YM2203%20da
 YM2203 Japanese datasheet contents, translated: http://www.larwe.com/technical/chip_ym2203.html
 */
 
-// additional modifications by tildearrow and Eulous for furnace (particularly AY8930 emulation)
+// additional modifications by tildearrow, Eulous, cam900 and Grauw for furnace (particularly AY8930 emulation)
 
 #include "ay8910.h"
 #include <stdio.h>

src/engine/platform/sound/namco.cpp

@@ -0,0 +1,797 @@
+// license:BSD-3-Clause
+// copyright-holders:Nicola Salmoria,Aaron Giles
+/***************************************************************************
+
+    NAMCO sound driver.
+
+    This driver handles the four known types of NAMCO wavetable sounds:
+
+        - 3-voice mono (PROM-based design: Pac-Man, Pengo, Dig Dug, etc)
+        - 8-voice quadrophonic (Pole Position 1, Pole Position 2)
+        - 8-voice mono (custom 15XX: Mappy, Dig Dug 2, etc)
+        - 8-voice stereo (System 1)
+
+    The 15XX custom does not have a DAC of its own; instead, it streams
+    the 4-bit PROM data directly into the 99XX custom DAC. Most pre-99XX
+    (and pre-15XX) Namco games use a LS273 latch (cleared when sound is
+    disabled), a 4.7K/2.2K/1K/470 resistor-weighted DAC, and a 4066 and
+    second group of resistors (10K/22K/47K/100K) for volume control.
+    Pole Position does more complicated sound mixing: a 4051 multiplexes
+    wavetable sound with four signals derived from the 52XX and 54XX, the
+    selected signal is distributed to four volume control sections, and
+    finally the engine noise is mixed into all four channels. The later
+    CUS30 also uses the 99XX DAC, or two 99XX in the optional 16-channel
+    stereo configuration, but it uses no PROM and delivers its own samples.
+
+    The CUS30 has been decapped and verified to be a ULA.
+
+***************************************************************************/
+
+// additional modifications by tildearrow for furnace
+
+#include "namco.h"
+#include <string.h>
+
+/* quality parameter: internal sample rate is 192 KHz, output is 48 KHz */
+#define INTERNAL_RATE   192000
+
+/* 16 bits: sample bits of the stream buffer    */
+/* 4 bits:  volume                  */
+/* 4 bits:  prom sample bits            */
+#define MIXLEVEL    (1 << (16 - 4 - 4))
+
+/* stream output level */
+#define OUTPUT_LEVEL(n)     ((n) * MIXLEVEL / m_voices)
+
+/* a position of waveform sample */
+#define WAVEFORM_POSITION(n)    (((n) >> m_f_fracbits) & 0x1f)
+
+namco_audio_device::namco_audio_device(uint32_t clock)
+	: m_wave_ptr(NULL)
+	, m_last_channel(nullptr)
+	, m_wavedata(nullptr)
+	, m_wave_size(0)
+	, m_sound_enable(false)
+	, m_namco_clock(0)
+	, m_sample_rate(0)
+	, m_f_fracbits(0)
+	, m_voices(0)
+	, m_stereo(false)
+{
+}
+
+namco_device::namco_device(uint32_t clock)
+	: namco_audio_device(clock)
+{
+}
+
+namco_15xx_device::namco_15xx_device(uint32_t clock)
+	:namco_audio_device(clock)
+{
+}
+
+namco_cus30_device::namco_cus30_device(uint32_t clock)
+	: namco_audio_device(clock)
+{
+}
+
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void namco_audio_device::device_start(unsigned char* wavePtr)
+{
+	/* extract globals from the interface */
+	m_last_channel = m_channel_list + m_voices;
+
+        m_wave_ptr = wavePtr;
+
+  memset(m_waveram_alloc,0,1024);
+
+	/* build the waveform table */
+	build_decoded_waveform(m_wave_ptr);
+
+	/* start with sound enabled, many games don't have a sound enable register */
+	m_sound_enable = true;
+
+	/* reset all the voices */
+	for (sound_channel *voice = m_channel_list; voice < m_last_channel; voice++)
+	{
+		voice->frequency = 0;
+		voice->volume[0] = voice->volume[1] = 0;
+		voice->waveform_select = 0;
+		voice->counter = 0;
+		voice->noise_sw = 0;
+		voice->noise_state = 0;
+		voice->noise_seed = 1;
+		voice->noise_counter = 0;
+		voice->noise_hold = 0;
+	}
+}
+
+void namco_audio_device::device_clock_changed(int clk)
+{
+	int clock_multiple;
+
+	// adjust internal clock 
+	m_namco_clock = clk;
+	for (clock_multiple = 0; m_namco_clock < INTERNAL_RATE; clock_multiple++)
+		m_namco_clock *= 2;
+
+	m_f_fracbits = clock_multiple + 15;
+
+	// adjust output clock 
+	m_sample_rate = m_namco_clock;
+
+	//logerror("Namco: freq fractional bits = %d: internal freq = %d, output freq = %d\n", m_f_fracbits, m_namco_clock, m_sample_rate);
+}
+
+
+/* update the decoded waveform data */
+void namco_audio_device::update_namco_waveform(int offset, uint8_t data)
+{
+	if (m_wave_size == 1)
+	{
+		int16_t wdata;
+		int v;
+
+		/* use full byte, first 4 high bits, then low 4 bits */
+		for (v = 0; v < (int)MAX_VOLUME; v++)
+		{
+			wdata = ((data >> 4) & 0x0f) - 8;
+			m_waveform[v][offset * 2] = OUTPUT_LEVEL(wdata * v);
+			wdata = (data & 0x0f) - 8;
+			m_waveform[v][offset * 2 + 1] = OUTPUT_LEVEL(wdata * v);
+		}
+	}
+	else
+	{
+		int v;
+
+		/* use only low 4 bits */
+		for (v = 0; v < (int)MAX_VOLUME; v++)
+			m_waveform[v][offset] = OUTPUT_LEVEL(((data & 0x0f) - 8) * v);
+	}
+}
+
+
+/* build the decoded waveform table */
+void namco_audio_device::build_decoded_waveform(uint8_t *rgnbase)
+{
+	if (rgnbase != nullptr)
+		m_wavedata = rgnbase;
+	else
+	{
+		m_wavedata = m_waveram_alloc;
+	}
+
+	for (int offset = 0; offset < 256; offset++)
+		update_namco_waveform(offset, m_wavedata[offset]);
+}
+
+
+/* generate sound by oversampling */
+uint32_t namco_audio_device::namco_update_one(short* buffer, int size, const int16_t *wave, uint32_t counter, uint32_t freq)
+{
+	for (int sampindex = 0; sampindex < size; sampindex++)
+	{
+		buffer[sampindex]+=wave[WAVEFORM_POSITION(counter)];
+		counter += freq;
+	}
+
+	return counter;
+}
+
+
+void namco_audio_device::sound_enable_w(int state)
+{
+	m_sound_enable = state;
+}
+
+void namco_device::device_start(unsigned char* wavePtr) {
+  memset(m_soundregs,0,1024);
+  namco_audio_device::device_start(wavePtr);
+}
+
+void namco_15xx_device::device_start(unsigned char* wavePtr) {
+  memset(m_soundregs,0,1024);
+  namco_audio_device::device_start(wavePtr);
+}
+
+void namco_cus30_device::device_start(unsigned char* wavePtr) {
+  namco_audio_device::device_start(wavePtr);
+}
+
+
+/********************************************************************************/
+
+/* pacman register map
+    0x05:       ch 0    waveform select
+    0x0a:       ch 1    waveform select
+    0x0f:       ch 2    waveform select
+
+    0x10:       ch 0    the first voice has extra frequency bits
+    0x11-0x14:  ch 0    frequency
+    0x15:       ch 0    volume
+
+    0x16-0x19:  ch 1    frequency
+    0x1a:       ch 1    volume
+
+    0x1b-0x1e:  ch 2    frequency
+    0x1f:       ch 2    volume
+*/
+
+void namco_device::pacman_sound_w(int offset, uint8_t data)
+{
+	sound_channel *voice;
+	int ch;
+
+	data &= 0x0f;
+	if (m_soundregs[offset] == data)
+		return;
+
+	/* set the register */
+	m_soundregs[offset] = data;
+
+	if (offset < 0x10)
+		ch = (offset - 5) / 5;
+	else if (offset == 0x10)
+		ch = 0;
+	else
+		ch = (offset - 0x11) / 5;
+
+	if (ch >= m_voices)
+		return;
+
+	/* recompute the voice parameters */
+	voice = m_channel_list + ch;
+	switch (offset - ch * 5)
+	{
+	case 0x05:
+		voice->waveform_select = data & 7;
+		break;
+
+	case 0x10:
+	case 0x11:
+	case 0x12:
+	case 0x13:
+	case 0x14:
+		/* the frequency has 20 bits */
+		/* the first voice has extra frequency bits */
+		voice->frequency = (ch == 0) ? m_soundregs[0x10] : 0;
+		voice->frequency += (m_soundregs[ch * 5 + 0x11] << 4);
+		voice->frequency += (m_soundregs[ch * 5 + 0x12] << 8);
+		voice->frequency += (m_soundregs[ch * 5 + 0x13] << 12);
+		voice->frequency += (m_soundregs[ch * 5 + 0x14] << 16); /* always 0 */
+		break;
+
+	case 0x15:
+		voice->volume[0] = data;
+		break;
+	}
+}
+
+void namco_cus30_device::pacman_sound_w(int offset, uint8_t data)
+{
+	sound_channel *voice;
+	int ch;
+
+	uint8_t *soundregs = &m_wavedata[0x100];
+
+	data &= 0x0f;
+	if (soundregs[offset] == data)
+		return;
+
+	/* set the register */
+	soundregs[offset] = data;
+
+	if (offset < 0x10)
+		ch = (offset - 5) / 5;
+	else if (offset == 0x10)
+		ch = 0;
+	else
+		ch = (offset - 0x11) / 5;
+
+	if (ch >= m_voices)
+		return;
+
+	/* recompute the voice parameters */
+	voice = m_channel_list + ch;
+	switch (offset - ch * 5)
+	{
+	case 0x05:
+		voice->waveform_select = data & 7;
+		break;
+
+	case 0x10:
+	case 0x11:
+	case 0x12:
+	case 0x13:
+	case 0x14:
+		/* the frequency has 20 bits */
+		/* the first voice has extra frequency bits */
+		voice->frequency = (ch == 0) ? soundregs[0x10] : 0;
+		voice->frequency += (soundregs[ch * 5 + 0x11] << 4);
+		voice->frequency += (soundregs[ch * 5 + 0x12] << 8);
+		voice->frequency += (soundregs[ch * 5 + 0x13] << 12);
+		voice->frequency += (soundregs[ch * 5 + 0x14] << 16); /* always 0 */
+		break;
+
+	case 0x15:
+		voice->volume[0] = data;
+		break;
+	}
+}
+
+/********************************************************************************/
+
+/* polepos register map
+Note: even if there are 8 voices, the game doesn't use the first 2 because
+it select the 54XX/52XX outputs on those channels
+
+    0x00-0x01   ch 0    frequency
+    0x02        ch 0    xxxx---- GAIN 2 volume
+    0x03        ch 0    xxxx---- GAIN 3 volume
+                        ----xxxx GAIN 4 volume
+
+    0x04-0x07   ch 1
+
+    .
+    .
+    .
+
+    0x1c-0x1f   ch 7
+
+    0x23        ch 0    xxxx---- GAIN 1 volume
+                        -----xxx waveform select
+                        ----x-xx channel output select
+                                 0-7 (all the same, shared with waveform select) = wave
+                                 8 = CHANL1 (54XX pins 17-20)
+                                 9 = CHANL2 (54XX pins 8-11)
+                                 A = CHANL3 (54XX pins 4-7)
+                                 B = CHANL4 (52XX)
+    0x27        ch 1
+    0x2b        ch 2
+    0x2f        ch 3
+    0x33        ch 4
+    0x37        ch 5
+    0x3b        ch 6
+    0x3f        ch 7
+*/
+
+uint8_t namco_device::polepos_sound_r(int offset)
+{
+	return m_soundregs[offset];
+}
+
+void namco_device::polepos_sound_w(int offset, uint8_t data)
+{
+	sound_channel *voice;
+	int ch;
+
+	if (m_soundregs[offset] == data)
+		return;
+
+	/* set the register */
+	m_soundregs[offset] = data;
+
+	ch = (offset & 0x1f) / 4;
+
+	/* recompute the voice parameters */
+	voice = m_channel_list + ch;
+	switch (offset & 0x23)
+	{
+	case 0x00:
+	case 0x01:
+		/* the frequency has 16 bits */
+		voice->frequency = m_soundregs[ch * 4 + 0x00];
+		voice->frequency += m_soundregs[ch * 4 + 0x01] << 8;
+		break;
+
+	case 0x23:
+		voice->waveform_select = data & 7;
+		// https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wimplicit-fallthrough
+		// fall through
+	case 0x02:
+	case 0x03:
+		voice->volume[0] = voice->volume[1] = 0;
+		// front speakers ?
+		voice->volume[0] += m_soundregs[ch * 4 + 0x03] >> 4;
+		voice->volume[1] += m_soundregs[ch * 4 + 0x03] & 0x0f;
+		// rear speakers ?
+		voice->volume[0] += m_soundregs[ch * 4 + 0x23] >> 4;
+		voice->volume[1] += m_soundregs[ch * 4 + 0x02] >> 4;
+
+		voice->volume[0] /= 2;
+		voice->volume[1] /= 2;
+
+		/* if 54XX or 52XX selected, silence this voice */
+		if (m_soundregs[ch * 4 + 0x23] & 8)
+			voice->volume[0] = voice->volume[1] = 0;
+		break;
+	}
+}
+
+
+/********************************************************************************/
+
+/* 15XX register map
+    0x03        ch 0    volume
+    0x04-0x05   ch 0    frequency
+    0x06        ch 0    waveform select & frequency
+
+    0x0b        ch 1    volume
+    0x0c-0x0d   ch 1    frequency
+    0x0e        ch 1    waveform select & frequency
+
+    .
+    .
+    .
+
+    0x3b        ch 7    volume
+    0x3c-0x3d   ch 7    frequency
+    0x3e        ch 7    waveform select & frequency
+
+Grobda also stuffs values into register offset 0x02 with a frequency of zero
+to make 15XX channels act like a 4-bit DAC instead of waveform voices. This
+has been emulated by allowing writes to set the upper counter bits directly.
+Possibly offsets 0x00 and 0x01 can be used to set the fractional bits.
+*/
+
+template <typename T, typename U> constexpr T make_bitmask(U n)
+{
+        return T((n < (int)(8 * sizeof(T)) ? (std::make_unsigned_t<T>(1) << n) : std::make_unsigned_t<T>(0)) - 1);
+}
+
+void namco_15xx_device::namco_15xx_w(int offset, uint8_t data)
+{
+	sound_channel *voice;
+	int ch;
+
+	if (m_soundregs[offset] == data)
+		return;
+
+	/* set the register */
+	m_soundregs[offset] = data;
+
+	ch = offset / 8;
+	if (ch >= m_voices)
+		return;
+
+	/* recompute the voice parameters */
+	voice = m_channel_list + ch;
+	switch (offset - ch * 8)
+	{
+	case 0x02:
+		voice->counter &= make_bitmask<uint32_t>(m_f_fracbits);
+		voice->counter |= uint32_t(data & 0x1f) << m_f_fracbits;
+		break;
+
+	case 0x03:
+		voice->volume[0] = data & 0x0f;
+		break;
+
+	case 0x06:
+		voice->waveform_select = (data >> 4) & 7;
+		// https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wimplicit-fallthrough
+		// fall through
+	case 0x04:
+	case 0x05:
+		/* the frequency has 20 bits */
+		voice->frequency = m_soundregs[ch * 8 + 0x04];
+		voice->frequency += m_soundregs[ch * 8 + 0x05] << 8;
+		voice->frequency += (m_soundregs[ch * 8 + 0x06] & 15) << 16;    /* high bits are from here */
+		break;
+	}
+}
+
+
+/********************************************************************************/
+
+/* namcos1 register map
+    0x00        ch 0    left volume
+    0x01        ch 0    waveform select & frequency
+    0x02-0x03   ch 0    frequency
+    0x04        ch 0    right volume AND
+    0x04        ch 1    noise sw
+
+    0x08        ch 1    left volume
+    0x09        ch 1    waveform select & frequency
+    0x0a-0x0b   ch 1    frequency
+    0x0c        ch 1    right volume AND
+    0x0c        ch 2    noise sw
+
+    .
+    .
+    .
+
+    0x38        ch 7    left volume
+    0x39        ch 7    waveform select & frequency
+    0x3a-0x3b   ch 7    frequency
+    0x3c        ch 7    right volume AND
+    0x3c        ch 0    noise sw
+*/
+
+void namco_cus30_device::namcos1_sound_w(int offset, uint8_t data)
+{
+	sound_channel *voice;
+	int ch;
+	int nssw;
+
+
+	/* verify the offset */
+	if (offset > 63)
+	{
+		//logerror("NAMCOS1 sound: Attempting to write past the 64 registers segment\n");
+		return;
+	}
+
+	uint8_t *soundregs = &m_wavedata[0x100];
+
+	if (soundregs[offset] == data)
+		return;
+
+	/* set the register */
+	soundregs[offset] = data;
+
+	ch = offset / 8;
+	if (ch >= m_voices)
+		return;
+
+	/* recompute the voice parameters */
+	voice = m_channel_list + ch;
+	switch (offset - ch * 8)
+	{
+	case 0x00:
+		voice->volume[0] = data & 0x0f;
+		break;
+
+	case 0x01:
+		voice->waveform_select = (data >> 4) & 15;
+		// https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wimplicit-fallthrough
+		// fall through
+	case 0x02:
+	case 0x03:
+		/* the frequency has 20 bits */
+		voice->frequency = (soundregs[ch * 8 + 0x01] & 15) << 16; /* high bits are from here */
+		voice->frequency += soundregs[ch * 8 + 0x02] << 8;
+		voice->frequency += soundregs[ch * 8 + 0x03];
+		break;
+
+	case 0x04:
+		voice->volume[1] = data & 0x0f;
+
+		nssw = ((data & 0x80) >> 7);
+		if (++voice == m_last_channel)
+			voice = m_channel_list;
+		voice->noise_sw = nssw;
+		break;
+	}
+}
+
+void namco_cus30_device::namcos1_cus30_w(int offset, uint8_t data)
+{
+	if (offset < 0x100)
+	{
+		if (m_wavedata[offset] != data)
+		{
+
+			m_wavedata[offset] = data;
+
+			/* update the decoded waveform table */
+			update_namco_waveform(offset, data);
+		}
+	}
+	else if (offset < 0x140) {
+		namcos1_sound_w(offset - 0x100,data);
+  }
+	else
+		m_wavedata[offset] = data;
+}
+
+uint8_t namco_cus30_device::namcos1_cus30_r(int offset)
+{
+	return m_wavedata[offset];
+}
+
+uint8_t namco_15xx_device::sharedram_r(int offset)
+{
+	return m_soundregs[offset];
+}
+
+void namco_15xx_device::sharedram_w(int offset, uint8_t data)
+{
+	if (offset < 0x40)
+		namco_15xx_w(offset, data);
+	else
+	{
+		m_soundregs[offset] = data;
+	}
+}
+
+//-------------------------------------------------
+//  sound_stream_update - handle a stream update
+//-------------------------------------------------
+
+void namco_audio_device::sound_stream_update(short** outputs, int len)
+{
+	if (m_stereo)
+	{
+		/* zap the contents of the buffers */
+		memset(outputs[0],0,len*sizeof(short));
+		memset(outputs[1],0,len*sizeof(short));
+
+		/* if no sound, we're done */
+		if (!m_sound_enable)
+			return;
+
+		/* loop over each voice and add its contribution */
+		for (sound_channel *voice = m_channel_list; voice < m_last_channel; voice++)
+		{
+			short* lmix = outputs[0];
+			short* rmix = outputs[1];
+			int lv = voice->volume[0];
+			int rv = voice->volume[1];
+
+			if (voice->noise_sw)
+			{
+				int f = voice->frequency & 0xff;
+
+				/* only update if we have non-zero volume */
+				if (lv || rv)
+				{
+					int hold_time = 1 << (m_f_fracbits - 16);
+					int hold = voice->noise_hold;
+					uint32_t delta = f << 4;
+					uint32_t c = voice->noise_counter;
+					int16_t l_noise_data = OUTPUT_LEVEL(0x07 * (lv >> 1));
+					int16_t r_noise_data = OUTPUT_LEVEL(0x07 * (rv >> 1));
+					int i;
+
+					/* add our contribution */
+					for (i = 0; i < len; i++)
+					{
+						int cnt;
+
+						if (voice->noise_state)
+						{
+							lmix[i]+=l_noise_data;
+							rmix[i]+=r_noise_data;
+						}
+						else
+						{
+							lmix[i]+=-l_noise_data;
+							rmix[i]+=-r_noise_data;
+						}
+
+						if (hold)
+						{
+							hold--;
+							continue;
+						}
+
+						hold =  hold_time;
+
+						c += delta;
+						cnt = (c >> 12);
+						c &= (1 << 12) - 1;
+						for( ;cnt > 0; cnt--)
+						{
+							if ((voice->noise_seed + 1) & 2) voice->noise_state ^= 1;
+							if (voice->noise_seed & 1) voice->noise_seed ^= 0x28000;
+							voice->noise_seed >>= 1;
+						}
+					}
+
+					/* update the counter and hold time for this voice */
+					voice->noise_counter = c;
+					voice->noise_hold = hold;
+				}
+			}
+			else
+			{
+				/* save the counter for this voice */
+				uint32_t c = voice->counter;
+
+				/* only update if we have non-zero left volume */
+				if (lv)
+				{
+					const int16_t *lw = &m_waveform[lv][voice->waveform_select * 32];
+
+					/* generate sound into the buffer */
+					c = namco_update_one(lmix, len, lw, voice->counter, voice->frequency);
+				}
+
+				/* only update if we have non-zero right volume */
+				if (rv)
+				{
+					const int16_t *rw = &m_waveform[rv][voice->waveform_select * 32];
+
+					/* generate sound into the buffer */
+					c = namco_update_one(rmix, len, rw, voice->counter, voice->frequency);
+				}
+
+				/* update the counter for this voice */
+				voice->counter = c;
+			}
+		}
+	}
+	else
+	{
+		sound_channel *voice;
+
+		short* buffer = outputs[0];
+		/* zap the contents of the buffer */
+    memset(buffer,0,len*sizeof(short));
+
+		/* if no sound, we're done */
+		if (!m_sound_enable)
+			return;
+
+		/* loop over each voice and add its contribution */
+		for (voice = m_channel_list; voice < m_last_channel; voice++)
+		{
+			int v = voice->volume[0];
+			if (voice->noise_sw)
+			{
+				int f = voice->frequency & 0xff;
+
+				/* only update if we have non-zero volume */
+				if (v)
+				{
+					int hold_time = 1 << (m_f_fracbits - 16);
+					int hold = voice->noise_hold;
+					uint32_t delta = f << 4;
+					uint32_t c = voice->noise_counter;
+					int16_t noise_data = OUTPUT_LEVEL(0x07 * (v >> 1));
+					int i;
+
+					/* add our contribution */
+					for (i = 0; i < len; i++)
+					{
+						int cnt;
+
+						if (voice->noise_state)
+							buffer[i]+=noise_data;
+						else
+							buffer[i]+=-noise_data;
+
+						if (hold)
+						{
+							hold--;
+							continue;
+						}
+
+						hold =  hold_time;
+
+						c += delta;
+						cnt = (c >> 12);
+						c &= (1 << 12) - 1;
+						for( ;cnt > 0; cnt--)
+						{
+							if ((voice->noise_seed + 1) & 2) voice->noise_state ^= 1;
+							if (voice->noise_seed & 1) voice->noise_seed ^= 0x28000;
+							voice->noise_seed >>= 1;
+						}
+					}
+
+					/* update the counter and hold time for this voice */
+					voice->noise_counter = c;
+					voice->noise_hold = hold;
+				}
+			}
+			else
+			{
+				/* only update if we have non-zero volume */
+				if (v)
+				{
+					const int16_t *w = &m_waveform[v][voice->waveform_select * 32];
+
+					/* generate sound into buffer and update the counter for this voice */
+					voice->counter = namco_update_one(buffer, len, w, voice->counter, voice->frequency);
+				}
+			}
+		}
+	}
+}