1 files changed, 17 insertions, 0 deletions
diff --git a/src/audio/audio.cc b/src/audio/audio.cc
index ba76a28..f5bc4ab 100644
--- a/src/audio/audio.cc
+++ b/src/audio/audio.cc
@@ -108,6 +108,10 @@ void audio_render_ahead(float music_time, float dt, float target_fill) {
   if (chunk_frames <= 0)
     return;
 
+  static int64_t g_total_render_calls = 0;
+  static int64_t g_total_frames_rendered = 0;
+  const int64_t frames_before = g_ring_buffer.get_total_written() / RING_BUFFER_CHANNELS;
+
   // Keep rendering small chunks until buffer is full enough
   while (true) {
     // First, try to flush any pending samples from previous partial writes
@@ -224,6 +228,19 @@ void audio_render_ahead(float music_time, float dt, float target_fill) {
       }
     }
   }
+
+  // DEBUG: Track actual frames rendered vs expected
+  const int64_t frames_after = g_ring_buffer.get_total_written() / RING_BUFFER_CHANNELS;
+  const int64_t actual_rendered = frames_after - frames_before;
+  g_total_render_calls++;
+  g_total_frames_rendered += actual_rendered;
+
+  if (g_total_render_calls % 600 == 0) {  // Every 10 seconds at 60fps
+    const float expected_frames = g_total_render_calls * (float)(chunk_frames);
+    const float drift_ms = (expected_frames - g_total_frames_rendered) / RING_BUFFER_SAMPLE_RATE * 1000.0f;
+    printf("[RENDER_DRIFT] calls=%lld expect=%.1f actual=%lld drift=%.2fms\n",
+           g_total_render_calls, expected_frames, g_total_frames_rendered, drift_ms);
+  }
 }
 
 float audio_get_playback_time() {