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Add Luminance based clipping #1121

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mTvare6 wants to merge 1 commit into from
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Add Luminance based clipping #1121

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11 changes: 8 additions & 3 deletions vello_shaders/shader/shared/blend.wgsl
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ const MIX_HUE = 12u;
const MIX_SATURATION = 13u;
const MIX_COLOR = 14u;
const MIX_LUMINOSITY = 15u;
const MIX_LUMINANCE_CLIP = 64u;
const MIX_CLIP = 128u;

fn screen(cb: vec3<f32>, cs: vec3<f32>) -> vec3<f32> {
Expand Down Expand Up @@ -218,11 +219,12 @@ fn blend_compose(
cs: vec3<f32>,
ab: f32,
as_: f32,
mode: u32
compose_mode: u32,
mix_mode: u32
) -> vec4<f32> {
var fa = 0.0;
var fb = 0.0;
switch mode {
switch compose_mode {
case COMPOSE_COPY: {
fa = 1.0;
fb = 0.0;
Expand All @@ -241,6 +243,9 @@ fn blend_compose(
}
case COMPOSE_SRC_IN: {
fa = ab;
if mix_mode == MIX_LUMINANCE_CLIP {
fa *= lum(cb);
}
fb = 0.0;
}
case COMPOSE_DEST_IN: {
Expand Down Expand Up @@ -305,6 +310,6 @@ fn blend_mix_compose(backdrop: vec4<f32>, src: vec4<f32>, mode: u32) -> vec4<f32
let co = mix(backdrop.rgb, cs, src.a);
return vec4(co, src.a + backdrop.a * (1.0 - src.a));
} else {
return blend_compose(cb, cs, backdrop.a, src.a, compose_mode);
return blend_compose(cb, cs, backdrop.a, src.a, compose_mode, mix_mode);
}
}
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