commit no. 6

src/ui/Application.cpp

@@ -253,6 +253,20 @@ void Application::render() {
         if (ImGui::BeginMenu("View")) {
             ImGui::MenuItem("Grid", nullptr, &specDisplay_.showGrid);
             ImGui::MenuItem("Fill Spectrum", nullptr, &specDisplay_.fillSpectrum);
+            ImGui::Separator();
+            if (ImGui::MenuItem("VSync", nullptr, &vsync_)) {
+                SDL_GL_SetSwapInterval(vsync_ ? 1 : 0);
+            }
+            ImGui::EndMenu();
+        }
+        if (ImGui::BeginMenu("Debug")) {
+            ImGui::MenuItem("Metrics/Debugger", nullptr, &showMetricsWindow_);
+            ImGui::MenuItem("Debug Log", nullptr, &showDebugLog_);
+            ImGui::MenuItem("Stack Tool", nullptr, &showStackTool_);
+            ImGui::MenuItem("Demo Window", nullptr, &showDemoWindow_);
+            ImGui::Separator();
+            ImGui::Text("%.1f FPS (%.3f ms)", ImGui::GetIO().Framerate,
+                        1000.0f / ImGui::GetIO().Framerate);
             ImGui::EndMenu();
         }
         ImGui::EndMenuBar();
@@ -337,6 +351,12 @@ void Application::render() {
 
     ImGui::End();
 
+    // ImGui debug windows
+    if (showDemoWindow_)    ImGui::ShowDemoWindow(&showDemoWindow_);
+    if (showMetricsWindow_) ImGui::ShowMetricsWindow(&showMetricsWindow_);
+    if (showDebugLog_)      ImGui::ShowDebugLogWindow(&showDebugLog_);
+    if (showStackTool_)     ImGui::ShowIDStackToolWindow(&showStackTool_);
+
     // Render
     ImGui::Render();
     int displayW, displayH;

src/ui/Application.h

@@ -113,6 +113,7 @@ private:
     float     maxDB_       = 0.0f;
     FreqScale freqScale_   = FreqScale::Linear;
     bool      paused_      = false;
+    bool      vsync_       = true;
     // (waterfallW_ removed — texture width tracks bin count automatically)
     // (waterfallH_ removed — fixed history depth of 1024 rows)
 
@@ -171,6 +172,12 @@ private:
     float specPosX_ = 0, specPosY_ = 0, specSizeX_ = 0, specSizeY_ = 0;
     float wfPosX_ = 0, wfPosY_ = 0, wfSizeX_ = 0, wfSizeY_ = 0;
 
+    // ImGui debug windows
+    bool showDemoWindow_    = false;
+    bool showMetricsWindow_ = false;
+    bool showDebugLog_      = false;
+    bool showStackTool_     = false;
+
     // Pre-allocated scratch buffers (avoid per-frame heap allocations)
     std::vector<std::vector<float>>  wfSpectraScratch_;
     std::vector<WaterfallChannelInfo> wfChInfoScratch_;