MergeSource.h File Reference

Authoritative WGSL for one feMerge source-over pass. More...

#include "donner/gpu/shader/wgsl/Compiler.h"

Include dependency graph for MergeSource.h:

Namespaces
namespace	donner
	Top-level Donner namespace, which is split into different sub-namespaces such as donner::svg and donner::css.

Variables
constexpr wgsl::SourceText	donner::gpu::shader::programs::kMergeSource
	Authoritative WGSL for one feMerge source-over pass.

Detailed Description

Authoritative WGSL for one feMerge source-over pass.

Variable Documentation

kMergeSource

wgsl::SourceText donner::gpu::shader::programs::kMergeSource

inlineconstexpr

Initial value:

{
    R"wgsl(@group(0) @binding(0) var sourceTexture: texture_2d<f32>;
@group(0) @binding(1) var destinationTexture: texture_2d<f32>;
@group(0) @binding(2) var outputTexture: texture_storage_2d<rgba32float, write>;
 
@compute @workgroup_size(8, 8, 1)
fn cs_main(@builtin(global_invocation_id) gid: vec3<u32>) {
  let extent = textureDimensions(outputTexture);
  if (((gid.x >= extent.x) || (gid.y >= extent.y))) {
    return;
  }
  let coords = vec2<i32>(gid.xy);
  let source = textureLoad(sourceTexture, coords, 0i);
  let destination = textureLoad(destinationTexture, coords, 0i);
  let remainingSourceAlpha = (1f - source.w);
  let result = (source + (destination * remainingSourceAlpha));
  textureStore(outputTexture, coords, saturate(result));
}
)wgsl"}

Authoritative WGSL for one feMerge source-over pass.