Updated game structure

src/core/GravityManager.h

@@ -0,0 +1,31 @@
+#pragma once
+#include <array>
+
+class GravityManager {
+public:
+    GravityManager();
+
+    // Global multiplier applied to all levels
+    void setGlobalMultiplier(double m);
+    double getGlobalMultiplier() const;
+
+    // Per-level multiplier (29 = 29+)
+    void setLevelMultiplier(int level, double m);
+    double getLevelMultiplier(int level) const;
+
+    // Compute ms per cell and fps for a given level
+    double getMsForLevel(int level) const;
+    double getFpsForLevel(int level) const;
+
+private:
+    static constexpr double NES_FPS = 60.0988;
+    static constexpr double FRAME_MS = 1000.0 / NES_FPS;
+    static constexpr int FRAMES_TABLE[30] = {
+        48,43,38,33,28,23,18,13,8,6,
+        5,5,5,4,4,4,3,3,3,2,
+        2,2,2,2,2,2,2,2,2,1
+    };
+
+    double globalMultiplier{1.0};
+    std::array<double,30> levelMultipliers{}; // default 1.0
+};