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blade: fix path rasterization (#7546)

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There were mistakes in the blending mode, primitive topology, and the
equation.

![gpui-text-selection](https://github.com/zed-industries/zed/assets/107301/13f1285e-1338-4c87-b1bb-7e426606f939)



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- N/A
This commit is contained in:
Dzmitry Malyshau 2024-02-08 06:08:04 -08:00 • committed by GitHub
parent 00024b791b
commit d457eef099
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GPG key ID: B5690EEEBB952194
2 changed files with 3 additions and 3 deletions
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crates/gpui/src/platform/linux/shaders.wgsl
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@ -365,7 +365,7 @@ fn fs_path_rasterization(input: PathRasterizationVarying) -> @location(0) f32 {
return 0.0;
}
let gradient = 2.0 * input.st_position * vec2<f32>(dx.x, dy.x) - vec2<f32>(dx.y, dy.y);
let gradient = 2.0 * input.st_position.xx * vec2<f32>(dx.x, dy.x) - vec2<f32>(dx.y, dy.y);
let f = input.st_position.x * input.st_position.x - input.st_position.y;
let distance = f / length(gradient);
return saturate(0.5 - distance);