GUI: improve oscilloscope

it's not finished yet

src/gui/gui.cpp

@@ -3432,7 +3432,9 @@ FurnaceGUI::FurnaceGUI():
   openSampleAmplifyOpt(false),
   openSampleSilenceOpt(false),
   openSampleFilterOpt(false),
-  oscTotal(0) {
+  oscTotal(0),
+  oscZoom(0.5f),
+  oscZoomSlider(false) {
   // value keys
   valueKeys[SDLK_0]=0;
   valueKeys[SDLK_1]=1;

src/gui/gui.h

@@ -71,6 +71,16 @@ enum FurnaceGUIColors {
   GUI_COLOR_FILE_FONT,
   GUI_COLOR_FILE_OTHER,
 
+  GUI_COLOR_OSC_BG1,
+  GUI_COLOR_OSC_BG2,
+  GUI_COLOR_OSC_BG3,
+  GUI_COLOR_OSC_BG4,
+  GUI_COLOR_OSC_BORDER,
+  GUI_COLOR_OSC_WAVE,
+  GUI_COLOR_OSC_WAVE_PEAK,
+  GUI_COLOR_OSC_REF,
+  GUI_COLOR_OSC_GUIDE,
+
   GUI_COLOR_VOLMETER_LOW,
   GUI_COLOR_VOLMETER_HIGH,
   GUI_COLOR_VOLMETER_PEAK,
@@ -979,6 +989,8 @@ class FurnaceGUI {
   // oscilloscope
   int oscTotal;
   float oscValues[512];
+  float oscZoom;
+  bool oscZoomSlider;
 
   // visualizer
   float keyHit[DIV_MAX_CHANS];

src/gui/guiConst.cpp

@@ -377,6 +377,16 @@ const FurnaceGUIColorDef guiColors[GUI_COLOR_MAX]={
   D(GUI_COLOR_FILE_FONT,"",ImVec4(0.3f,1.0f,0.6f,1.0f)),
   D(GUI_COLOR_FILE_OTHER,"",ImVec4(0.7f,0.7f,0.7f,1.0f)),
 
+  D(GUI_COLOR_OSC_BG1,"",ImVec4(0.1f,0.18f,0.3f,1.0f)),
+  D(GUI_COLOR_OSC_BG2,"",ImVec4(0.1f,0.18f,0.3f,1.0f)),
+  D(GUI_COLOR_OSC_BG3,"",ImVec4(0.05f,0.15f,0.25f,1.0f)),
+  D(GUI_COLOR_OSC_BG4,"",ImVec4(0.05f,0.15f,0.25f,1.0f)),
+  D(GUI_COLOR_OSC_BORDER,"",ImVec4(0.4f,0.6f,0.95f,1.0f)),
+  D(GUI_COLOR_OSC_WAVE,"",ImVec4(0.95f,0.95f,1.0f,1.0f)),
+  D(GUI_COLOR_OSC_WAVE_PEAK,"",ImVec4(0.95f,0.95f,1.0f,1.0f)),
+  D(GUI_COLOR_OSC_REF,"",ImVec4(0.3f,0.3f,0.3f,1.0f)),
+  D(GUI_COLOR_OSC_GUIDE,"",ImVec4(0.3,0.3f,0.3f,1.0f)),
+
   D(GUI_COLOR_VOLMETER_LOW,"",ImVec4(0.2f,0.6f,0.2f,1.0f)),
   D(GUI_COLOR_VOLMETER_HIGH,"",ImVec4(1.0f,0.9f,0.2f,1.0f)),
   D(GUI_COLOR_VOLMETER_PEAK,"",ImVec4(1.0f,0.1f,0.1f,1.0f)),

src/gui/osc.cpp

@@ -18,6 +18,8 @@
  */
 
 #include "gui.h"
+#include "imgui_internal.h"
+#include <imgui.h>
 #include <math.h>
 
 void FurnaceGUI::readOsc() {
@@ -71,16 +73,88 @@ void FurnaceGUI::drawOsc() {
   }
   if (!oscOpen) return;
   ImGui::SetNextWindowSizeConstraints(ImVec2(64.0f*dpiScale,32.0f*dpiScale),ImVec2(scrW*dpiScale,scrH*dpiScale));
-  ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding,ImVec2(0,0));
+  /*ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding,ImVec2(0,0));
   ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing,ImVec2(0,0));
-  ImGui::PushStyleVar(ImGuiStyleVar_ItemInnerSpacing,ImVec2(0,0));
+  ImGui::PushStyleVar(ImGuiStyleVar_ItemInnerSpacing,ImVec2(0,0));*/
   if (ImGui::Begin("Oscilloscope",&oscOpen)) {
-    //ImGui::SetCursorPos(ImVec2(0,0));
-    ImGui::BeginDisabled();
-    ImGui::PlotLines("##SingleOsc",oscValues,512,0,NULL,-1.0f,1.0f,ImGui::GetContentRegionAvail());
-    ImGui::EndDisabled();
+    if (oscZoomSlider) {
+      if (ImGui::VSliderFloat("##OscZoom",ImVec2(20.0f*dpiScale,ImGui::GetContentRegionAvail().y),&oscZoom,0.5,2.0)) {
+        if (oscZoom<0.5) oscZoom=0.5;
+        if (oscZoom>2.0) oscZoom=2.0;
+      }
+      ImGui::SameLine();
+    }
+
+    ImDrawList* dl=ImGui::GetWindowDrawList();
+    ImGuiWindow* window=ImGui::GetCurrentWindow();
+
+    ImVec2 waveform[512];
+    ImVec2 size=ImGui::GetContentRegionAvail();
+
+    ImVec2 minArea=window->DC.CursorPos;
+    ImVec2 maxArea=ImVec2(
+      minArea.x+size.x,
+      minArea.y+size.y
+    );
+    ImRect rect=ImRect(minArea,maxArea);
+    ImGuiStyle& style=ImGui::GetStyle();
+    ImU32 color=ImGui::GetColorU32(isClipping?uiColors[GUI_COLOR_OSC_WAVE_PEAK]:uiColors[GUI_COLOR_OSC_WAVE]);
+    ImU32 borderColor=ImGui::GetColorU32(uiColors[GUI_COLOR_OSC_BORDER]);
+    ImGui::ItemSize(size,style.FramePadding.y);
+    if (ImGui::ItemAdd(rect,ImGui::GetID("wsDisplay"))) {
+      // https://github.com/ocornut/imgui/issues/3710
+      // TODO: improve
+      const int v0 = dl->VtxBuffer.Size;
+      dl->AddRectFilled(rect.Min,rect.Max,0xffffffff,8.0f*dpiScale);
+      const int v1 = dl->VtxBuffer.Size;
+
+      for (int i=v0; i<v1; i++) {
+        ImDrawVert* v=&dl->VtxBuffer.Data[i];
+        ImVec4 col0=uiColors[GUI_COLOR_OSC_BG1];
+        ImVec4 col1=uiColors[GUI_COLOR_OSC_BG3];
+        ImVec4 col2=uiColors[GUI_COLOR_OSC_BG2];
+        ImVec4 col3=uiColors[GUI_COLOR_OSC_BG4];
+        
+        float shadeX=(v->pos.x-rect.Min.x)/(rect.Max.x-rect.Min.x);
+        float shadeY=(v->pos.y-rect.Min.y)/(rect.Max.y-rect.Min.y);
+        if (shadeX<0.0f) shadeX=0.0f;
+        if (shadeX>1.0f) shadeX=1.0f;
+        if (shadeY<0.0f) shadeY=0.0f;
+        if (shadeY>1.0f) shadeY=1.0f;
+
+        col0.x+=(col2.x-col0.x)*shadeX;
+        col0.y+=(col2.y-col0.y)*shadeX;
+        col0.z+=(col2.z-col0.z)*shadeX;
+        col0.w+=(col2.w-col0.w)*shadeX;
+
+        col1.x+=(col3.x-col1.x)*shadeX;
+        col1.y+=(col3.y-col1.y)*shadeX;
+        col1.z+=(col3.z-col1.z)*shadeX;
+        col1.w+=(col3.w-col1.w)*shadeX;
+
+        col0.x+=(col1.x-col0.x)*shadeY;
+        col0.y+=(col1.y-col0.y)*shadeY;
+        col0.z+=(col1.z-col0.z)*shadeY;
+        col0.w+=(col1.w-col0.w)*shadeY;
+
+        v->col=ImGui::ColorConvertFloat4ToU32(col0);
+      }
+
+      for (size_t i=0; i<512; i++) {
+        float x=(float)i/512.0f;
+        float y=oscValues[i]*oscZoom;
+        if (y<-0.5f) y=-0.5f;
+        if (y>0.5f) y=0.5f;
+        waveform[i]=ImLerp(rect.Min,rect.Max,ImVec2(x,0.5f-y));
+      }
+      dl->AddPolyline(waveform,512,color,ImDrawFlags_None,dpiScale);
+      dl->AddRect(rect.Min,rect.Max,borderColor,8.0f*dpiScale,0,dpiScale);
+    }
+    if (ImGui::IsItemClicked(ImGuiMouseButton_Right)) {
+      oscZoomSlider=!oscZoomSlider;
+    }
   }
-  ImGui::PopStyleVar(3);
+  //ImGui::PopStyleVar(3);
   if (ImGui::IsWindowFocused(ImGuiFocusedFlags_ChildWindows)) curWindow=GUI_WINDOW_OSCILLOSCOPE;
   ImGui::End();
-}
+}

src/gui/settings.cpp

@@ -942,6 +942,18 @@ void FurnaceGUI::drawSettings() {
             UI_COLOR_CONFIG(GUI_COLOR_FILE_OTHER,"Other");
             ImGui::TreePop();
           }
+          if (ImGui::TreeNode("Oscilloscope")) {
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_BORDER,"Border");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_BG1,"Background (top-left)");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_BG2,"Background (top-right)");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_BG3,"Background (bottom-left)");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_BG4,"Background (bottom-right)");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_WAVE,"Waveform");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_WAVE_PEAK,"Waveform (clip)");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_REF,"Reference");
+            UI_COLOR_CONFIG(GUI_COLOR_OSC_GUIDE,"Guide");
+            ImGui::TreePop();
+          }
           if (ImGui::TreeNode("Volume Meter")) {
             UI_COLOR_CONFIG(GUI_COLOR_VOLMETER_LOW,"Low");
             UI_COLOR_CONFIG(GUI_COLOR_VOLMETER_HIGH,"High");