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// This file is part of the 64k demo project.
// It declares the FlashEffect - brief white flash on beat hits.
#pragma once
#include "gpu/effect.h"
#include "gpu/gpu.h"
#include "gpu/uniform_helper.h"
// Parameters for FlashEffect (set at construction time)
struct FlashEffectParams {
float color[3] = {1.0f, 1.0f, 1.0f}; // Default: white
float decay_rate = 0.98f; // Default: fast decay
float trigger_threshold = 0.7f; // Default: trigger on strong beats
};
// 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; // 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:
// Backward compatibility constructor (uses default params)
FlashEffect(const GpuContext& ctx);
// New parameterized constructor
FlashEffect(const GpuContext& ctx, const FlashEffectParams& params);
void render(WGPURenderPassEncoder pass, float time, float beat,
float intensity, float aspect_ratio) override;
void update_bind_group(WGPUTextureView input_view) override;
private:
FlashEffectParams params_;
UniformBuffer<FlashUniforms> uniforms_;
float flash_intensity_ = 0.0f;
};
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