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gsk: Add more modes to the blend shader

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Use the compositing CSS spec at:

  https://www.w3.org/TR/compositing-1/#blending

For the implementation.
This commit is contained in:
Emmanuele Bassi 2016-07-03 23:02:56 +01:00
parent 9e3b0f5aa0
commit a840c7f00c
1 changed files with 46 additions and 6 deletions
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52
gsk/resources/glsl/blend.fs.glsl
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@ -1,22 +1,62 @@
vec3 BlendMultiply(vec3 Csrc, vec3 Cdst) {
return Csrc * Cdst;
vec3 BlendMultiply(vec3 Cb, vec3 Cs) {
return Cb * Cs;
}
vec3 BlendScreen(vec3 Cb, vec3 Cs) {
return Cb + Cs - (Cb * Cs);
}
vec3 BlendHardLight(vec3 Cb, vec3 Cs) {
vec3 m = BlendMultiply(Cb, 2.0 * Cs);
vec3 s = BlendScreen(Cb, 2.0 * Cs - 1.0);
vec3 edge = vec3(0.5, 0.5, 0.5);
/* Use mix() and step() to avoid a branch */
return mix(m, s, step(edge, Cs));
}
vec3 BlendOverlay(vec3 Cb, vec3 Cs) {
return BlendHardLight(Cs, Cb);
}
vec3 BlendDarken(vec3 Cb, vec3 Cs) {
return min(Cb, Cs);
}
vec3 BlendLighten(vec3 Cb, vec3 Cs) {
return max(Cb, Cs);
}
void main() {
vec4 src = Texture(map, vUv);
vec4 mask = Texture(parentMap, vUv);
vec4 diffuse = Texture(map, vUv);
vec3 res;
if (blendMode == 0) {
res = src.xyz;
res = diffuse.xyz;
}
else if (blendMode == 1) {
res = BlendMultiply(src.xyz, mask.xyz);
res = BlendMultiply(mask.xyz, diffuse.xyz);
}
else if (blendMode == 2) {
res = BlendScreen(mask.xyz, diffuse.xyz);
}
else if (blendMode == 3) {
res = BlendOverlay(mask.xyz, diffuse.xyz);
}
else if (blendMode == 4) {
res = BlendDarken(mask.xyz, diffuse.xyz);
}
else if (blendMode == 5) {
res = BlendLighten(mask.xyz, diffuse.xyz);
}
else if (blendMode == 8) {
res = BlendHardLight(mask.xyz, diffuse.xyz);
}
else {
// Use red for debugging missing blend modes
res = vec3(1.0, 0.0, 0.0);
}
setOutputColor(vec4(res, src.a * alpha));
setOutputColor(vec4(res, diffuse.a * alpha));
}