1 files changed, 10 insertions, 4 deletions
diff --git a/src/gpu/effects/theme_modulation_effect.cc b/src/gpu/effects/theme_modulation_effect.cc
index f9ae636..7c222aa 100644
--- a/src/gpu/effects/theme_modulation_effect.cc
+++ b/src/gpu/effects/theme_modulation_effect.cc
@@ -6,6 +6,12 @@
 #include "gpu/effects/shaders.h"
 #include <cmath>
 
+struct ThemeModulationParams {
+  float theme_brightness;
+  float _pad[3];
+};
+static_assert(sizeof(ThemeModulationParams) == 16, "ThemeModulationParams must be 16 bytes for WGSL alignment");
+
 ThemeModulationEffect::ThemeModulationEffect(const GpuContext& ctx)
     : PostProcessEffect(ctx) {
   const char* shader_code = R"(
@@ -24,7 +30,7 @@ ThemeModulationEffect::ThemeModulationEffect(const GpuContext& ctx)
       audio_intensity: f32,
     };
 
-    struct EffectParams {
+    struct ThemeModulationParams {
       theme_brightness: f32,
       _pad0: f32,
       _pad1: f32,
@@ -34,7 +40,7 @@ ThemeModulationEffect::ThemeModulationEffect(const GpuContext& ctx)
     @group(0) @binding(0) var inputSampler: sampler;
     @group(0) @binding(1) var inputTexture: texture_2d<f32>;
     @group(0) @binding(2) var<uniform> uniforms: CommonUniforms;
-    @group(0) @binding(3) var<uniform> params: EffectParams;
+    @group(0) @binding(3) var<uniform> params: ThemeModulationParams;
 
     @vertex
     fn vs_main(@builtin(vertex_index) vertexIndex: u32) -> VertexOutput {
@@ -97,8 +103,8 @@ void ThemeModulationEffect::render(WGPURenderPassEncoder pass, float time,
       bright_value + (dark_value - bright_value) * transition;
 
   // Update params buffer
-  float params[4] = {theme_brightness, 0.0f, 0.0f, 0.0f};
-  wgpuQueueWriteBuffer(ctx_.queue, params_buffer_.buffer, 0, params,
+  ThemeModulationParams params = {theme_brightness, {0.0f, 0.0f, 0.0f}};
+  wgpuQueueWriteBuffer(ctx_.queue, params_buffer_.buffer, 0, &params,
                        sizeof(params));
 
   // Render