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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)



Release Notes:
- 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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4
crates/gpui/src/platform/linux/blade_renderer.rs
View File

@ -145,14 +145,14 @@ impl BladePipelines {
data_layouts: &[&ShaderPathRasterizationData::layout()],
vertex: shader.at("vs_path_rasterization"),
primitive: gpu::PrimitiveState {
topology: gpu::PrimitiveTopology::TriangleStrip,
topology: gpu::PrimitiveTopology::TriangleList,
..Default::default()
},
depth_stencil: None,
fragment: shader.at("fs_path_rasterization"),
color_targets: &[gpu::ColorTargetState {
format: PATH_TEXTURE_FORMAT,
blend: Some(gpu::BlendState::ALPHA_BLENDING),
blend: Some(gpu::BlendState::ADDITIVE),
write_mask: gpu::ColorWrites::default(),
}],
}),

2
crates/gpui/src/platform/linux/shaders.wgsl
View File

@ -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);