84 lines
1.6 KiB
GLSL
84 lines
1.6 KiB
GLSL
#version {{version}}
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// Automatically generated from files in pathfinder/shaders/. Do not edit!
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#extension GL_GOOGLE_include_directive : enable
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precision highp float;
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out vec4 oFragColor;
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uniform sampler2D uStencilTexture;
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uniform sampler2D uPaintTexture;
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uniform sampler2D uDest;
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uniform vec2 uFramebufferSize;
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in vec2 vColorTexCoord;
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in vec2 vMaskTexCoord;
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in float vOpacity;
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vec4 sampleSrcColor(){
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float coverage = texture(uStencilTexture, vMaskTexCoord). r;
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vec4 srcRGBA = texture(uPaintTexture, vColorTexCoord);
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return vec4(srcRGBA . rgb, srcRGBA . a * coverage * vOpacity);
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}
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vec4 sampleDestColor(){
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vec2 destTexCoord = gl_FragCoord . xy / uFramebufferSize;
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return texture(uDest, destTexCoord);
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}
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vec4 blendColors(vec4 destRGBA, vec4 srcRGBA, vec3 blendedRGB){
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return vec4(srcRGBA . a *(1.0 - destRGBA . a)* srcRGBA . rgb +
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srcRGBA . a * destRGBA . a * blendedRGB +
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(1.0 - srcRGBA . a)* destRGBA . a * destRGBA . rgb,
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1.0);
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}
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vec3 select3(bvec3 cond, vec3 a, vec3 b){
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return vec3(cond . x ? a . x : b . x, cond . y ? a . y : b . y, cond . z ? a . z : b . z);
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}
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void main(){
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vec4 srcRGBA = sampleSrcColor();
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vec4 destRGBA = sampleDestColor();
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vec3 dest = destRGBA . rgb, src = srcRGBA . rgb;
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bvec3 destDark = lessThanEqual(dest, vec3(0.25)), srcDark = lessThanEqual(src, vec3(0.5));
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vec3 d = select3(destDark,(dest * 16.0 - 12.0)* dest + 4.0, inversesqrt(dest));
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vec3 x = select3(srcDark, vec3(1.0)- dest, d - 1.0);
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vec3 blended = dest *((src * 2.0 - 1.0)* x + 1.0);
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oFragColor = blendColors(destRGBA, srcRGBA, blended);
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}
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