fix: calculate beat_phase for FlashEffect and refactor uniforms

- seq_compiler.py: Calculate beat_phase from beat_time (was hardcoded 0.0f)
- Refactor: Replace CommonPostProcessUniforms with UniformsSequenceParams
- Remove duplicate struct definition in post_process_helper.h
- Update all CNN effects and tests to use unified uniform struct
- Fixes FlashEffect showing solid white instead of flashing to beat

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

1 files changed, 3 insertions, 3 deletions

diff --git a/tools/cnn_test.cc b/tools/cnn_test.cc
index d88956d..a209cdf 100644
--- a/tools/cnn_test.cc
+++ b/tools/cnn_test.cc
@@ -1332,7 +1332,7 @@ int main(int argc, char** argv) {
   // Create uniform buffers
   const WGPUBufferDescriptor common_uniform_desc = {
       .usage = WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst,
-      .size = sizeof(CommonPostProcessUniforms),
+      .size = sizeof(UniformsSequenceParams),
   };
   WGPUBuffer common_uniform_buffer =
       wgpuDeviceCreateBuffer(device, &common_uniform_desc);
@@ -1384,7 +1384,7 @@ int main(int argc, char** argv) {
     printf("Processing layer %d/%d...\n", layer + 1, NUM_LAYERS);
 
     // Update uniforms
-    CommonPostProcessUniforms common_u = {
+    UniformsSequenceParams common_u = {
         .resolution = {static_cast<float>(width), static_cast<float>(height)},
         .aspect_ratio = static_cast<float>(width) / static_cast<float>(height),
         .time = 0.0f,
@@ -1410,7 +1410,7 @@ int main(int argc, char** argv) {
         BindGroupBuilder()
             .sampler(0, sampler)
             .texture(1, current_input)
-            .buffer(2, common_uniform_buffer, sizeof(CommonPostProcessUniforms))
+            .buffer(2, common_uniform_buffer, sizeof(UniformsSequenceParams))
             .buffer(3, layer_params_buffer, sizeof(CNNv1LayerParams))
             .texture(4, original_view)
             .build(device, bgl);