1 files changed, 8 insertions, 4 deletions
diff --git a/src/gpu/effects/flash_effect.h b/src/gpu/effects/flash_effect.h
index 8241557..373b48b 100644
--- a/src/gpu/effects/flash_effect.h
+++ b/src/gpu/effects/flash_effect.h
@@ -15,12 +15,16 @@ struct FlashEffectParams {
 };
 
 // Uniform data sent to GPU shader
+// IMPORTANT: Must match WGSL struct layout with proper alignment
+// vec3<f32> in WGSL has 16-byte alignment, not 12-byte!
 struct FlashUniforms {
-  float flash_intensity;
-  float intensity;
-  float color[3];  // RGB flash color
-  float _pad;
+  float flash_intensity;  // offset 0
+  float intensity;        // offset 4
+  float _pad1[2];         // offset 8-15 (padding for vec3 alignment)
+  float color[3];         // offset 16-27 (vec3 aligned to 16 bytes)
+  float _pad2;            // offset 28-31
 };
+static_assert(sizeof(FlashUniforms) == 32, "FlashUniforms must be 32 bytes for WGSL alignment");
 
 class FlashEffect : public PostProcessEffect {
  public: