70 lines
3.0 KiB
WebGPU Shading Language
70 lines
3.0 KiB
WebGPU Shading Language
[[block]] struct Uniforms {
|
|
dstTextureFlipY : u32;
|
|
channelCount : u32;
|
|
srcCopyOrigin : vec2<u32>;
|
|
dstCopyOrigin : vec2<u32>;
|
|
copySize : vec2<u32>;
|
|
};
|
|
[[block]] struct OutputBuf {
|
|
result : array<u32>;
|
|
};
|
|
[[group(0), binding(0)]] var src : texture_2d<f32>;
|
|
[[group(0), binding(1)]] var dst : texture_2d<f32>;
|
|
[[group(0), binding(2)]] var<storage, read_write> output : OutputBuf;
|
|
[[group(0), binding(3)]] var<uniform> uniforms : Uniforms;
|
|
fn aboutEqual(value : f32, expect : f32) -> bool {
|
|
// The value diff should be smaller than the hard coded tolerance.
|
|
return abs(value - expect) < 0.001;
|
|
}
|
|
[[stage(compute), workgroup_size(1, 1, 1)]]
|
|
fn main([[builtin(global_invocation_id)]] GlobalInvocationID : vec3<u32>) {
|
|
let srcSize : vec2<i32> = textureDimensions(src);
|
|
let dstSize : vec2<i32> = textureDimensions(dst);
|
|
let dstTexCoord : vec2<u32> = vec2<u32>(GlobalInvocationID.xy);
|
|
let nonCoveredColor : vec4<f32> =
|
|
vec4<f32>(0.0, 1.0, 0.0, 1.0); // should be green
|
|
|
|
var success : bool = true;
|
|
if (dstTexCoord.x < uniforms.dstCopyOrigin.x ||
|
|
dstTexCoord.y < uniforms.dstCopyOrigin.y ||
|
|
dstTexCoord.x >= uniforms.dstCopyOrigin.x + uniforms.copySize.x ||
|
|
dstTexCoord.y >= uniforms.dstCopyOrigin.y + uniforms.copySize.y) {
|
|
success = success &&
|
|
all(textureLoad(dst, vec2<i32>(dstTexCoord), 0) == nonCoveredColor);
|
|
} else {
|
|
// Calculate source texture coord.
|
|
var srcTexCoord : vec2<u32> = dstTexCoord - uniforms.dstCopyOrigin +
|
|
uniforms.srcCopyOrigin;
|
|
// Note that |flipY| equals flip src texture firstly and then do copy from src
|
|
// subrect to dst subrect. This helps on blink part to handle some input texture
|
|
// which is flipped and need to unpack flip during the copy.
|
|
// We need to calculate the expect y coord based on this rule.
|
|
if (uniforms.dstTextureFlipY == 1u) {
|
|
srcTexCoord.y = u32(srcSize.y) - srcTexCoord.y - 1u;
|
|
}
|
|
|
|
let srcColor : vec4<f32> = textureLoad(src, vec2<i32>(srcTexCoord), 0);
|
|
let dstColor : vec4<f32> = textureLoad(dst, vec2<i32>(dstTexCoord), 0);
|
|
|
|
// Not use loop and variable index format to workaround
|
|
// crbug.com/tint/638.
|
|
if (uniforms.channelCount == 2u) { // All have rg components.
|
|
success = success &&
|
|
aboutEqual(dstColor.r, srcColor.r) &&
|
|
aboutEqual(dstColor.g, srcColor.g);
|
|
} else {
|
|
success = success &&
|
|
aboutEqual(dstColor.r, srcColor.r) &&
|
|
aboutEqual(dstColor.g, srcColor.g) &&
|
|
aboutEqual(dstColor.b, srcColor.b) &&
|
|
aboutEqual(dstColor.a, srcColor.a);
|
|
}
|
|
}
|
|
let outputIndex : u32 = GlobalInvocationID.y * u32(dstSize.x) +
|
|
GlobalInvocationID.x;
|
|
if (success) {
|
|
output.result[outputIndex] = 1u;
|
|
} else {
|
|
output.result[outputIndex] = 0u;
|
|
}
|
|
} |