1 files changed, 13 insertions, 1 deletions
diff --git a/src/main.cc b/src/main.cc
index aba8d4b..9f61f07 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -92,10 +92,20 @@ int main(int argc, char** argv) {
   // int melody_id = generate_melody();
   // synth_trigger_voice(melody_id, 0.6f, 0.0f);
 
+  // Music time state for variable tempo
+  static float g_music_time = 0.0f;
+  static float g_tempo_scale = 1.0f;  // 1.0 = normal speed
+  static double g_last_physical_time = 0.0;
+
   double last_beat_time = 0.0;
   int beat_count = 0;
 
   auto update_game_logic = [&](double t) {
+    // Calculate delta time and advance music time at scaled rate
+    const float dt = (float)(t - g_last_physical_time);
+    g_last_physical_time = t;
+    g_music_time += dt * g_tempo_scale;
+
     if (t - last_beat_time > (60.0f / g_tracker_score.bpm) / 2.0) { // 8th notes
       last_beat_time = t;                                           // Sync to t
 
@@ -115,7 +125,9 @@ int main(int argc, char** argv) {
       */
       ++beat_count;
     }
-    tracker_update((float)t);
+
+    // Pass music_time (not physical time) to tracker
+    tracker_update(g_music_time);
   };
 
 #if !defined(STRIP_ALL)