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Merge pull request #927 from zed-industries/quad-border-visual-glitch

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Correctly alpha-blend border and background in quad SDF
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Antonio Scandurra 2022-04-28 16:36:51 +02:00 committed by GitHub
commit 64ecfcd33f
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1 changed files with 10 additions and 5 deletions
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15
crates/gpui/src/platform/mac/shaders/shaders.metal
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@ -71,11 +71,16 @@ float4 quad_sdf(QuadFragmentInput input) {
color = input.background_color;
} else {
float inset_distance = distance + border_width;
float4 border_color = float4(
mix(input.background_color.rgb, input.border_color.rgb, input.border_color.a),
saturate(input.background_color.a + input.border_color.a)
);
color = mix(border_color, input.background_color, saturate(0.5 - inset_distance));
// Decrease border's opacity as we move inside the background.
input.border_color.a *= 1. - saturate(0.5 - inset_distance);
// Alpha-blend the border and the background.
float output_alpha = input.border_color.a + input.background_color.a * (1. - input.border_color.a);
float3 premultiplied_border_rgb = input.border_color.rgb * input.border_color.a;
float3 premultiplied_background_rgb = input.background_color.rgb * input.background_color.a;
float3 premultiplied_output_rgb = premultiplied_border_rgb + premultiplied_background_rgb * (1. - input.border_color.a);
color = float4(premultiplied_output_rgb / output_alpha, output_alpha);
}
return color * float4(1., 1., 1., saturate(0.5 - distance));