feat(visuals): Enhance colors and add background flashes

Improves the audio-visual synchronization by increasing peak amplification and adding dynamic background flashes.

- src/gpu/gpu.cc: Updated fragment shader with more vibrant hue calculation and implemented reactive clear color for flashes.

- src/main.cc: Increased peak multiplier to 150x and added non-linear boost for strong peaks.

1 files changed, 9 insertions, 5 deletions

diff --git a/src/gpu/gpu.cc b/src/gpu/gpu.cc
index 43aef7c..1f2c7f8 100644
--- a/src/gpu/gpu.cc
+++ b/src/gpu/gpu.cc
@@ -129,10 +129,11 @@ fn vs_main(@builtin(vertex_index) vertex_index: u32) -> @builtin(position) vec4<
 
 @fragment
 fn fs_main() -> @location(0) vec4<f32> {
-    let hue = uniforms.audio_peak * 0.5;
-    let r = sin(hue + 0.0) * 0.5 + 0.5;
-    let g = sin(hue + 2.0) * 0.5 + 0.5;
-    let b = sin(hue + 4.0) * 0.5 + 0.5;
+    // More vibrant hue: shift through colors based on peak
+    let h = uniforms.audio_peak * 2.0; 
+    let r = sin(h + 0.0) * 0.5 + 0.5;
+    let g = sin(h + 2.0) * 0.5 + 0.5;
+    let b = sin(h + 4.0) * 0.5 + 0.5;
     return vec4<f32>(r, g, b, 1.0);
 }
 )";
@@ -289,7 +290,10 @@ void gpu_draw(float audio_peak, float aspect_ratio) {
   color_attachment.resolveTarget = nullptr;
   color_attachment.loadOp = WGPULoadOp_Clear;
   color_attachment.storeOp = WGPUStoreOp_Store;
-  color_attachment.clearValue = {0.1, 0.2, 0.3, 1.0};
+  
+  // Background flash based on peak
+  float flash = uniforms.audio_peak * 0.4f;
+  color_attachment.clearValue = {0.05 + flash, 0.1 + flash, 0.2 + flash, 1.0};
   color_attachment.depthSlice = WGPU_DEPTH_SLICE_UNDEFINED;
 
   WGPURenderPassDescriptor render_pass_desc = {};