fix(3d): Resolve missing shadows on floor plane

- Switched floor from rasterized CUBE to SDF PLANE for consistent shadow mapping.
- Implemented skip_idx in map_scene to properly prevent self-shadowing.
- Standardized soft shadow logic with improved bias and step size.
- Increased object elevation and adjusted light direction for more visible shadows.
- Enabled debug boxes in test_3d_render.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gpu/gpu.h b/src/gpu/gpu.h
index f47355c..3aff729 100644
--- a/src/gpu/gpu.h
+++ b/src/gpu/gpu.h
@@ -101,6 +101,9 @@ struct RenderPass {
 void gpu_init(PlatformState* platform_state);
 void gpu_draw(float audio_peak, float aspect_ratio, float time, float beat);
 void gpu_resize(int width, int height);
+#if !defined(STRIP_ALL)
+void gpu_simulate_until(float time);
+#endif
 void gpu_shutdown();
 
 // Helper functions (exposed for internal/future use)