From 95802739b8ccaf9112fe4fe6e496ba7ae4158aae Mon Sep 17 00:00:00 2001 From: skal Date: Fri, 6 Mar 2026 22:53:29 +0100 Subject: feat(effects): add Scratch post-process effect with reusable scratch_lines snippet - src/shaders/render/scratch_lines.wgsl: reusable WGSL snippet registered as "render/scratch_lines"; call scratch_lines(uv, resolution, time)->f32 from any effect. Uses hash_1f from math/noise; 8 lines/frame, ~24fps flicker. - src/effects/scratch.{wgsl,h,cc}: thin Scratch effect wrapping the snippet. - Applied to "intro" and "rotating_cube" sequences as the final step. - 35/35 tests passing. handoff(Gemini): Scratch effect added. render/scratch_lines snippet is reusable. Co-Authored-By: Claude Sonnet 4.6 --- src/effects/scratch_effect.cc | 44 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 src/effects/scratch_effect.cc (limited to 'src/effects/scratch_effect.cc') diff --git a/src/effects/scratch_effect.cc b/src/effects/scratch_effect.cc new file mode 100644 index 0000000..f49e601 --- /dev/null +++ b/src/effects/scratch_effect.cc @@ -0,0 +1,44 @@ +// Scratch effect - film scratch overlay post-process + +#include "effects/scratch_effect.h" +#include "effects/shaders.h" +#include "gpu/post_process_helper.h" +#include "util/fatal_error.h" + +Scratch::Scratch(const GpuContext& ctx, const std::vector& inputs, + const std::vector& outputs, float start_time, + float end_time) + : Effect(ctx, inputs, outputs, start_time, end_time) { + HEADLESS_RETURN_IF_NULL(ctx_.device); + + create_linear_sampler(); + + pipeline_.set(create_post_process_pipeline(ctx_.device, + WGPUTextureFormat_RGBA8Unorm, + scratch_shader_wgsl)); +} + +void Scratch::render(WGPUCommandEncoder encoder, + const UniformsSequenceParams& params, + NodeRegistry& nodes) { + WGPUTextureView input_view = nodes.get_view(input_nodes_[0]); + WGPUTextureView output_view = nodes.get_view(output_nodes_[0]); + + pp_update_bind_group(ctx_.device, pipeline_.get(), bind_group_.get_address(), + input_view, uniforms_buffer_.get(), {nullptr, 0}); + + WGPURenderPassColorAttachment color_attachment = {}; + gpu_init_color_attachment(color_attachment, output_view); + + WGPURenderPassDescriptor pass_desc = {}; + pass_desc.colorAttachmentCount = 1; + pass_desc.colorAttachments = &color_attachment; + + WGPURenderPassEncoder pass = + wgpuCommandEncoderBeginRenderPass(encoder, &pass_desc); + wgpuRenderPassEncoderSetPipeline(pass, pipeline_.get()); + wgpuRenderPassEncoderSetBindGroup(pass, 0, bind_group_.get(), 0, nullptr); + wgpuRenderPassEncoderDraw(pass, 3, 1, 0, 0); + wgpuRenderPassEncoderEnd(pass); + wgpuRenderPassEncoderRelease(pass); +} -- cgit v1.2.3