feat: Introduce TimingManager for Accurate Frame Timing

- Added TimingManager class to provide precise timing for animations and frame pacing, addressing issues with ImGui::GetIO().DeltaTime.
- Updated event handling in the window management to use SDL_PollEvent for improved responsiveness.
- Integrated TimingManager into EditorManager, BackgroundRenderer, and WelcomeScreen for consistent delta time usage across the application.
- Enhanced animation updates to utilize accurate frame timing, improving visual performance and user experience.

src/app/core/timing.h

@@ -0,0 +1,119 @@
+#ifndef YAZE_APP_CORE_TIMING_H
+#define YAZE_APP_CORE_TIMING_H
+
+#include <SDL.h>
+#include <cstdint>
+
+namespace yaze {
+namespace core {
+
+/**
+ * @class TimingManager
+ * @brief Provides accurate timing for animations and frame pacing
+ * 
+ * This class solves the issue where ImGui::GetIO().DeltaTime only updates
+ * when events are processed (mouse movement, etc). It uses SDL's performance
+ * counter to provide accurate timing regardless of input events.
+ */
+class TimingManager {
+ public:
+  static TimingManager& Get() {
+    static TimingManager instance;
+    return instance;
+  }
+
+  /**
+   * @brief Update the timing manager (call once per frame)
+   * @return The delta time since last update in seconds
+   */
+  float Update() {
+    uint64_t current_time = SDL_GetPerformanceCounter();
+    float delta_time = 0.0f;
+    
+    if (last_time_ > 0) {
+      delta_time = (current_time - last_time_) / static_cast<float>(frequency_);
+      
+      // Clamp delta time to prevent huge jumps (e.g., when debugging)
+      if (delta_time > 0.1f) {
+        delta_time = 0.1f;
+      }
+      
+      accumulated_time_ += delta_time;
+      frame_count_++;
+      
+      // Update FPS counter once per second
+      if (accumulated_time_ >= 1.0f) {
+        fps_ = static_cast<float>(frame_count_) / accumulated_time_;
+        frame_count_ = 0;
+        accumulated_time_ = 0.0f;
+      }
+    }
+    
+    last_time_ = current_time;
+    last_delta_time_ = delta_time;
+    return delta_time;
+  }
+  
+  /**
+   * @brief Get the last frame's delta time in seconds
+   */
+  float GetDeltaTime() const {
+    return last_delta_time_;
+  }
+  
+  /**
+   * @brief Get current FPS
+   */
+  float GetFPS() const {
+    return fps_;
+  }
+  
+  /**
+   * @brief Get total elapsed time since first update
+   */
+  float GetElapsedTime() const {
+    if (last_time_ == 0) return 0.0f;
+    uint64_t current_time = SDL_GetPerformanceCounter();
+    return (current_time - first_time_) / static_cast<float>(frequency_);
+  }
+  
+  /**
+   * @brief Reset the timing state
+   */
+  void Reset() {
+    last_time_ = 0;
+    first_time_ = SDL_GetPerformanceCounter();
+    accumulated_time_ = 0.0f;
+    frame_count_ = 0;
+    fps_ = 0.0f;
+    last_delta_time_ = 0.0f;
+  }
+
+ private:
+  TimingManager() {
+    frequency_ = SDL_GetPerformanceFrequency();
+    first_time_ = SDL_GetPerformanceCounter();
+    last_time_ = 0;
+    accumulated_time_ = 0.0f;
+    frame_count_ = 0;
+    fps_ = 0.0f;
+    last_delta_time_ = 0.0f;
+  }
+
+  uint64_t frequency_;
+  uint64_t first_time_;
+  uint64_t last_time_;
+  float accumulated_time_;
+  uint32_t frame_count_;
+  float fps_;
+  float last_delta_time_;
+
+  TimingManager(const TimingManager&) = delete;
+  TimingManager& operator=(const TimingManager&) = delete;
+};
+
+}  // namespace core
+}  // namespace yaze
+
+#endif  // YAZE_APP_CORE_TIMING_H
+

src/app/core/window.cc

@@ -120,28 +120,29 @@ absl::Status ShutdownWindow(Window& window) {
 absl::Status HandleEvents(Window& window) {
   SDL_Event event;
   ImGuiIO& io = ImGui::GetIO();
-  SDL_WaitEvent(&event);
-  ImGui_ImplSDL2_ProcessEvent(&event);
-  switch (event.type) {
-    case SDL_KEYDOWN:
-    case SDL_KEYUP: {
-      io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0);
-      io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0);
-      io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0);
-      io.KeySuper = ((SDL_GetModState() & KMOD_GUI) != 0);
-      break;
-    }
-    case SDL_WINDOWEVENT:
-      switch (event.window.event) {
-        case SDL_WINDOWEVENT_CLOSE:
-          window.active_ = false;
-          break;
-        case SDL_WINDOWEVENT_SIZE_CHANGED:
-          io.DisplaySize.x = static_cast<float>(event.window.data1);
-          io.DisplaySize.y = static_cast<float>(event.window.data2);
-          break;
+  while (SDL_PollEvent(&event)) {
+      ImGui_ImplSDL2_ProcessEvent(&event);
+    switch (event.type) {
+      case SDL_KEYDOWN:
+      case SDL_KEYUP: {
+        io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0);
+        io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0);
+        io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0);
+        io.KeySuper = ((SDL_GetModState() & KMOD_GUI) != 0);
+        break;
       }
-      break;
+      case SDL_WINDOWEVENT:
+        switch (event.window.event) {
+          case SDL_WINDOWEVENT_CLOSE:
+            window.active_ = false;
+            break;
+          case SDL_WINDOWEVENT_SIZE_CHANGED:
+            io.DisplaySize.x = static_cast<float>(event.window.data1);
+            io.DisplaySize.y = static_cast<float>(event.window.data2);
+            break;
+        }
+        break;
+    }
   }
   int mouseX;
   int mouseY;

src/app/editor/editor_manager.cc

@@ -11,6 +11,7 @@
 #include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
 #include "app/core/features.h"
+#include "app/core/timing.h"
 #include "util/file_util.h"
 #include "app/core/project.h"
 #include "app/editor/code/assembly_editor.h"
@@ -636,6 +637,10 @@ void EditorManager::Initialize(const std::string& filename) {
 }
 
 absl::Status EditorManager::Update() {
+  // Update timing manager for accurate delta time across the application
+  // This fixes animation timing issues that occur when mouse isn't moving
+  core::TimingManager::Get().Update();
+  
   popup_manager_->DrawPopups();
   ExecuteShortcuts(context_.shortcut_manager);
   toast_manager_.Draw();
@@ -1475,7 +1480,7 @@ void EditorManager::DrawMenuBar() {
 
   if (show_emulator_) {
     Begin("Emulator", &show_emulator_, ImGuiWindowFlags_MenuBar);
-    emulator_.Run();
+    emulator_.Run(current_rom_);
     End();
   }
 

src/app/editor/ui/background_renderer.cc

@@ -3,6 +3,7 @@
 #include <algorithm>
 #include <cmath>
 
+#include "app/core/timing.h"
 #include "app/gui/theme_manager.h"
 #include "imgui/imgui.h"
 
@@ -23,7 +24,7 @@ void BackgroundRenderer::RenderDockingBackground(ImDrawList* draw_list, const Im
                                                const ImVec2& window_size, const Color& theme_color) {
   if (!draw_list) return;
   
-  UpdateAnimation(ImGui::GetIO().DeltaTime);
+  UpdateAnimation(core::TimingManager::Get().GetDeltaTime());
   
   // Get current theme colors
   auto& theme_manager = ThemeManager::Get();

src/app/editor/ui/welcome_screen.cc

@@ -10,6 +10,7 @@
 #include "absl/time/clock.h"
 #include "absl/time/time.h"
 #include "app/core/project.h"
+#include "app/core/timing.h"
 #include "app/gui/icons.h"
 #include "app/gui/theme_manager.h"
 #include "imgui/imgui.h"
@@ -244,7 +245,8 @@ bool WelcomeScreen::Show(bool* p_open) {
       }
       
       // Smooth interpolation to target position (faster response)
-      float lerp_speed = 8.0f * ImGui::GetIO().DeltaTime;
+      // Use TimingManager for accurate delta time
+      float lerp_speed = 8.0f * yaze::core::TimingManager::Get().GetDeltaTime();
       triforce_positions_[i].x += (target_pos.x - triforce_positions_[i].x) * lerp_speed;
       triforce_positions_[i].y += (target_pos.y - triforce_positions_[i].y) * lerp_speed;