Fix test_demo build failure after Effect refactor

Updated PeakMeterEffect in test_demo.cc to use the new Effect::uniforms_ (UniformBuffer<CommonPostProcessUniforms>) instead of manual buffer management. Mapped peak_value to audio_intensity.

1 files changed, 15 insertions, 10 deletions

diff --git a/src/test_demo.cc b/src/test_demo.cc
index a438bbc..d116f85 100644
--- a/src/test_demo.cc
+++ b/src/test_demo.cc
@@ -32,10 +32,13 @@ class PeakMeterEffect : public PostProcessEffect {
       };
 
       struct Uniforms {
-        peak_value: f32,
+        resolution: vec2<f32>,
         _pad0: f32,
         _pad1: f32,
-        _pad2: f32,
+        aspect_ratio: f32,
+        time: f32,
+        beat: f32,
+        audio_intensity: f32,
       };
 
       @group(0) @binding(0) var inputSampler: sampler;
@@ -69,7 +72,7 @@ class PeakMeterEffect : public PostProcessEffect {
         // Optimization: Return bar color early (avoids texture sampling for ~5% of pixels)
         if (in_bar_y && in_bar_x) {
           let uv_x = (input.uv.x - bar_x_min) / (bar_x_max - bar_x_min);
-          let factor = step(uv_x, uniforms.peak_value);
+          let factor = step(uv_x, uniforms.audio_intensity);
           return mix(vec4<f32>(0.0, 0.0, 0.0, 1.0), vec4<f32>(1.0, 0.0, 0.0,1.0), factor);
         }
 
@@ -80,24 +83,26 @@ class PeakMeterEffect : public PostProcessEffect {
 
     pipeline_ =
         create_post_process_pipeline(ctx_.device, ctx_.format, shader_code);
-    uniforms_ = gpu_create_buffer(
-        ctx_.device, 16, WGPUBufferUsage_Uniform | WGPUBufferUsage_CopyDst);
   }
 
   void update_bind_group(WGPUTextureView input_view) {
     pp_update_bind_group(ctx_.device, pipeline_, &bind_group_, input_view,
-                         uniforms_, {});
+                         uniforms_.get(), {});
   }
 
   void render(WGPURenderPassEncoder pass, float time, float beat,
               float peak_value, float aspect_ratio) {
     (void)time;
     (void)beat;
-    (void)aspect_ratio;
 
-    float uniforms[4] = {peak_value, 0.0f, 0.0f, 0.0f};
-    wgpuQueueWriteBuffer(ctx_.queue, uniforms_.buffer, 0, uniforms,
-                         sizeof(uniforms));
+    CommonPostProcessUniforms u = {
+        .resolution = {(float)width_, (float)height_},
+        .aspect_ratio = aspect_ratio,
+        .time = time,
+        .beat = beat,
+        .audio_intensity = peak_value,
+    };
+    uniforms_.update(ctx_.queue, u);
 
     wgpuRenderPassEncoderSetPipeline(pass, pipeline_);
     wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_, 0, nullptr);