fix: update PeakMeterEffect uniform structure in test_demo

The embedded shader in PeakMeterEffect was using the old uniform
structure with _pad0/_pad1 instead of the new beat_time/beat_phase
fields, causing the peak meter bar to not display correctly.

Updated to match CommonPostProcessUniforms structure:
- Removed _pad0, _pad1
- Added beat_time, beat_phase
- Moved _pad to end

Peak meter visualization now works correctly in test_demo.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/test_demo.cc b/src/test_demo.cc
index edbcae0..595ca6a 100644
--- a/src/test_demo.cc
+++ b/src/test_demo.cc
@@ -33,12 +33,12 @@ class PeakMeterEffect : public PostProcessEffect {
 
       struct Uniforms {
         resolution: vec2<f32>,
-        _pad0: f32,
-        _pad1: f32,
         aspect_ratio: f32,
         time: f32,
-        beat: f32,
+        beat_time: f32,
+        beat_phase: f32,
         audio_intensity: f32,
+        _pad: f32,
       };
 
       struct EffectParams {