GUI: add timing debug info

src/gui/debugWindow.cpp

@@ -20,6 +20,7 @@
 #include "gui.h"
 #include "debug.h"
 #include "IconsFontAwesome4.h"
+#include <SDL_timer.h>
 #include <fmt/printf.h>
 #include <imgui.h>
 
@@ -370,6 +371,13 @@ void FurnaceGUI::drawDebug() {
       }
       ImGui::TreePop();
     }
+    if (ImGui::TreeNode("Performance")) {
+      double perfFreq=SDL_GetPerformanceFrequency()/1000000.0;
+      ImGui::Text("render: %.0fµs",(double)renderTimeDelta/perfFreq);
+      ImGui::Text("layout: %.0fµs",(double)layoutTimeDelta/perfFreq);
+      ImGui::Text("event: %.0fµs",(double)eventTimeDelta/perfFreq);
+      ImGui::TreePop();
+    }
     if (ImGui::TreeNode("Settings")) {
       if (ImGui::Button("Sync")) syncSettings();
       ImGui::SameLine();

src/gui/gui.cpp

@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include <SDL_timer.h>
 #define _USE_MATH_DEFINES
 #include "gui.h"
 #include "util.h"
@@ -2411,6 +2412,7 @@ bool FurnaceGUI::loop() {
       drawHalt=0;
       if (settings.powerSave) SDL_WaitEventTimeout(NULL,500);
     }
+    eventTimeBegin=SDL_GetPerformanceCounter();
     while (SDL_PollEvent(&ev)) {
       WAKE_UP;
       ImGui_ImplSDL2_ProcessEvent(&ev);
@@ -2721,6 +2723,10 @@ bool FurnaceGUI::loop() {
       midiLock.unlock();
     }
 
+    eventTimeEnd=SDL_GetPerformanceCounter();
+
+    layoutTimeBegin=SDL_GetPerformanceCounter();
+    
     ImGui_ImplSDLRenderer_NewFrame();
     ImGui_ImplSDL2_NewFrame(sdlWin);
     ImGui::NewFrame();
@@ -3740,6 +3746,8 @@ bool FurnaceGUI::loop() {
       ImGui::EndPopup();
     }
 
+    layoutTimeEnd=SDL_GetPerformanceCounter();
+
     // backup trigger
     if (modified) {
       if (backupTimer>0) {
@@ -3778,10 +3786,16 @@ bool FurnaceGUI::loop() {
                                    uiColors[GUI_COLOR_BACKGROUND].z*255,
                                    uiColors[GUI_COLOR_BACKGROUND].w*255);
     SDL_RenderClear(sdlRend);
+    renderTimeBegin=SDL_GetPerformanceCounter();
     ImGui::Render();
+    renderTimeEnd=SDL_GetPerformanceCounter();
     ImGui_ImplSDLRenderer_RenderDrawData(ImGui::GetDrawData());
     SDL_RenderPresent(sdlRend);
 
+    layoutTimeDelta=layoutTimeEnd-layoutTimeBegin;
+    renderTimeDelta=renderTimeEnd-renderTimeBegin;
+    eventTimeDelta=eventTimeEnd-eventTimeBegin;
+
     if (--soloTimeout<0) soloTimeout=0;
 
     wheelX=0;
@@ -4283,6 +4297,15 @@ FurnaceGUI::FurnaceGUI():
   bindSetPending(false),
   nextScroll(-1.0f),
   nextAddScroll(0.0f),
+  layoutTimeBegin(0),
+  layoutTimeEnd(0),
+  layoutTimeDelta(0),
+  renderTimeBegin(0),
+  renderTimeEnd(0),
+  renderTimeDelta(0),
+  eventTimeBegin(0),
+  eventTimeEnd(0),
+  eventTimeDelta(0),
   transposeAmount(0),
   randomizeMin(0),
   randomizeMax(255),

src/gui/gui.h

@@ -1189,6 +1189,10 @@ class FurnaceGUI {
 
   float nextScroll, nextAddScroll;
 
+  int layoutTimeBegin, layoutTimeEnd, layoutTimeDelta;
+  int renderTimeBegin, renderTimeEnd, renderTimeDelta;
+  int eventTimeBegin, eventTimeEnd, eventTimeDelta;
+
   ImVec2 patWindowPos, patWindowSize;
   
   // pattern view specific