From 9bb5fd64776ac8a7e4b012ac2de340ddfa09a2c9 Mon Sep 17 00:00:00 2001 From: skal Date: Mon, 9 Feb 2026 14:28:46 +0100 Subject: feat: GPU procedural Phase 4 - texture composition Multi-input composite shaders with sampler support. - Dynamic bind group layouts (N input textures + 1 sampler) - dispatch_composite() for multi-input compute dispatch - create_gpu_composite_texture() API - gen_blend.wgsl and gen_mask.wgsl shaders Guarded with #if !defined(STRIP_GPU_COMPOSITE) for easy removal. Tests: - Blend two noise textures - Mask noise with grid - Multi-stage composite (composite of composites) Size: ~830 bytes (2 shaders + dispatch logic) handoff(Claude): GPU procedural Phase 4 complete --- assets/final/shaders/compute/gen_blend.wgsl | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 assets/final/shaders/compute/gen_blend.wgsl (limited to 'assets/final/shaders/compute/gen_blend.wgsl') diff --git a/assets/final/shaders/compute/gen_blend.wgsl b/assets/final/shaders/compute/gen_blend.wgsl new file mode 100644 index 0000000..9fc9e1e --- /dev/null +++ b/assets/final/shaders/compute/gen_blend.wgsl @@ -0,0 +1,29 @@ +// This file is part of the 64k demo project. +// GPU composite shader: Blend two textures. + +struct BlendParams { + width: u32, + height: u32, + blend_factor: f32, + _pad0: f32, +} + +@group(0) @binding(0) var output_tex: texture_storage_2d; +@group(0) @binding(1) var params: BlendParams; +@group(0) @binding(2) var input_a: texture_2d; +@group(0) @binding(3) var input_b: texture_2d; +@group(0) @binding(4) var tex_sampler: sampler; + +@compute @workgroup_size(8, 8, 1) +fn main(@builtin(global_invocation_id) id: vec3) { + if (id.x >= params.width || id.y >= params.height) { return; } + + let uv = vec2(f32(id.x) / f32(params.width), + f32(id.y) / f32(params.height)); + + let color_a = textureSampleLevel(input_a, tex_sampler, uv, 0.0); + let color_b = textureSampleLevel(input_b, tex_sampler, uv, 0.0); + let blended = mix(color_a, color_b, params.blend_factor); + + textureStore(output_tex, id.xy, blended); +} -- cgit v1.2.3