42 lines
1.7 KiB
WebGPU Shading Language
42 lines
1.7 KiB
WebGPU Shading Language
/// Shader used for drawing bitmap fills.
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/// NOTE: The `common.wgsl` source is prepended to this before compilation.
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struct VertexOutput {
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@builtin(position) position: vec4<f32>,
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@location(0) uv: vec2<f32>,
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};
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@group(1) @binding(0) var<uniform> transforms: common__Transforms;
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@group(2) @binding(0) var<uniform> textureTransforms: common__TextureTransforms;
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@group(2) @binding(1) var texture: texture_2d<f32>;
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@group(2) @binding(2) var texture_sampler: sampler;
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@vertex
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fn main_vertex(in: common__VertexInput) -> VertexOutput {
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let matrix_ = textureTransforms.texture_matrix;
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let uv = (mat3x3<f32>(matrix_[0].xyz, matrix_[1].xyz, matrix_[2].xyz) * vec3<f32>(in.position, 1.0)).xy;
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let pos = common__globals.view_matrix * transforms.world_matrix * vec4<f32>(in.position.x, in.position.y, 0.0, 1.0);
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return VertexOutput(pos, uv);
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}
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@fragment
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fn main_fragment(in: VertexOutput) -> @location(0) vec4<f32> {
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var color: vec4<f32> = textureSample(texture, texture_sampler, in.uv);
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// Texture is premultiplied by alpha.
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// Unmultiply alpha, apply color transform, remultiply alpha.
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if( color.a > 0.0 ) {
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color = vec4<f32>(color.rgb / color.a, color.a);
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color = color * transforms.mult_color + transforms.add_color;
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// NOTE: `#EARLY_SATURATE#` is replaced with a boolean value at compile time.
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// TODO: Switch to pipeline constants once `wgpu` is updated to `0.20`.
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if (#EARLY_SATURATE# == true) {
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color = saturate(color);
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}
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color = vec4<f32>(color.rgb * color.a, color.a);
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if (#EARLY_SATURATE# == false) {
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color = saturate(color);
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}
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}
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return color;
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}
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