feat: Add --seek command line option for fast-forward debugging

This feature allows developers to jump to a specific time in the demo sequence (e.g., './demo64k --seek 10.5'). It simulates the game logic, audio state (rendering silent buffers), and visual physics (compute shaders) from t=0 up to the target time before starting real-time playback. Audio initialization is refactored to separate device init and start.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 0655bb3..e68b84d 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -425,6 +425,10 @@ void gpu_draw(float audio_peak, float aspect_ratio, float time, float beat) {
   g_main_sequence.render_frame(time, beat, audio_peak, aspect_ratio, g_surface);
 }
 
+void gpu_simulate_until(float time) {
+  g_main_sequence.simulate_until(time, 1.0f / 60.0f);
+}
+
 void gpu_shutdown() {
   g_main_sequence.shutdown();
 }
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