From 4b23fdc63d422b31b6ad86d34218e7b66b462514 Mon Sep 17 00:00:00 2001 From: skal Date: Sun, 8 Feb 2026 17:43:44 +0100 Subject: feat(gpu): Add parameter-driven GaussianBlurEffect Extends shader parametrization system to GaussianBlurEffect with strength parameter (Task #73 continued). Changes: - Added GaussianBlurParams struct (strength, default: 2.0f) - Added GaussianBlurUniforms with proper WGSL alignment (32 bytes) - Updated shader to use parameterized strength instead of hardcoded 2.0 - Extended seq_compiler to parse strength parameter - Updated demo.seq with 2 parameterized instances: * Line 38: strength=3.0 (stronger blur for particles) * Line 48: strength=1.5 (subtle blur) Technical details: - Backward-compatible default constructor maintained - Migrated from raw buffer to UniformBuffer - Shader replaces 'let base_size = 2.0' with 'uniforms.strength' - Generated code creates GaussianBlurParams initialization Testing: - All 32/32 tests pass - Demo runs without errors - Generated code verified correct Co-Authored-By: Claude Sonnet 4.5 --- src/gpu/demo_effects.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'src/gpu/demo_effects.h') diff --git a/src/gpu/demo_effects.h b/src/gpu/demo_effects.h index 36be118..6c8729d 100644 --- a/src/gpu/demo_effects.h +++ b/src/gpu/demo_effects.h @@ -77,12 +77,38 @@ class ParticleSprayEffect : public Effect { GpuBuffer particles_buffer_; }; +// Parameters for GaussianBlurEffect (set at construction time) +struct GaussianBlurParams { + float strength = 2.0f; // Default: 2.0 pixel blur radius +}; + +// Uniform data sent to GPU shader +struct GaussianBlurUniforms { + float time; // offset 0 + float beat; // offset 4 + float intensity; // offset 8 + float aspect_ratio; // offset 12 + float width; // offset 16 + float height; // offset 20 + float strength; // offset 24 + float _pad; // offset 28 +}; +static_assert(sizeof(GaussianBlurUniforms) == 32, + "GaussianBlurUniforms must be 32 bytes for WGSL alignment"); + class GaussianBlurEffect : public PostProcessEffect { public: + // Backward compatibility constructor (uses default params) GaussianBlurEffect(const GpuContext& ctx); + // New parameterized constructor + GaussianBlurEffect(const GpuContext& ctx, const GaussianBlurParams& params); void render(WGPURenderPassEncoder pass, float time, float beat, float intensity, float aspect_ratio) override; void update_bind_group(WGPUTextureView input_view) override; + + private: + GaussianBlurParams params_; + UniformBuffer uniforms_; }; class SolarizeEffect : public PostProcessEffect { -- cgit v1.2.3