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wgpu: Handle alpha correctly for add or subtract blendmodes

This commit is contained in:
Nathan Adams 2022-12-21 01:00:29 +01:00
parent 864f404f2f
commit 7e564185b5
1 changed files with 4 additions and 4 deletions
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8
render/wgpu/shaders/blend.wgsl
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@ -66,16 +66,16 @@ fn blend_func(src: vec3<f32>, dst: vec3<f32>) -> vec3<f32> {
@fragment
fn main_fragment(in: VertexOutput) -> @location(0) vec4<f32> {
// dst is the parent pixel we're blending onto - it is either 0 or 1 alpha.
// dst is the parent pixel we're blending onto
var dst: vec4<f32> = textureSample(parent_texture, texture_sampler, in.uv);
// src is the pixel that we want to apply - it may have any alpha.
// src is the pixel that we want to apply
var src: vec4<f32> = textureSample(current_texture, texture_sampler, in.uv);
if (src.a > 0.0) {
if (blend.mode == 6) { // Add
return vec4<f32>(src.rgb + dst.rgb, 1.0);
return src + dst;
} else if (blend.mode == 7) { // Subtract
return vec4<f32>(dst.rgb - src.rgb, 1.0);
return vec4<f32>(dst.rgb - src.rgb, src.a + dst.a);
} else if (blend.mode == 9) { // Alpha
return vec4<f32>(dst.rgb * src.a, src.a * dst.a);
} else if (blend.mode == 10) { // Erase