Add MP1_VARIABLE_DELTA_TIME option (for high refresh rates; buggy)

Runtime/MP1/MP1.hpp

@@ -1,6 +1,11 @@
 #pragma once
 
+#ifndef MP1_USE_BOO
 #define MP1_USE_BOO 0
+#endif
+#ifndef MP1_VARIABLE_DELTA_TIME
+#define MP1_VARIABLE_DELTA_TIME 0
+#endif
 
 #include "IMain.hpp"
 #include "CTweaks.hpp"
@@ -108,7 +113,6 @@ public:
     CScriptMazeNode::LoadMazeSeeds();
   }
 
-
   void ResetGameState() {
     x134_gameState = std::make_unique<CGameState>();
     g_GameState = x134_gameState.get();
@@ -174,8 +178,8 @@ public:
   void PreloadAudio();
   bool LoadAudio();
   void UnloadAudio();
-  void UpdateTicks();
-  void Update();
+  void UpdateTicks(float dt);
+  void Update(float dt);
   void Draw();
 
   bool isRectDirty() const { return m_rectIsDirty; }
@@ -251,6 +255,12 @@ private:
   bool m_loadedPersistentResources = false;
   bool m_doQuit = false;
 
+#if MP1_VARIABLE_DELTA_TIME
+  bool m_firstFrame = true;
+  using delta_clock = std::chrono::high_resolution_clock;
+  std::chrono::time_point<delta_clock> m_prevFrameTime;
+#endif
+
   void InitializeSubsystems();
   static void InitializeDiscord();
   static void ShutdownDiscord();