#version {{version}}
// Automatically generated from files in pathfinder/shaders/. Do not edit!












#extension GL_GOOGLE_include_directive : enable

precision highp float;

uniform ivec3 uBlendHSL;

out vec4 oFragColor;












uniform sampler2D uStencilTexture;
uniform sampler2D uPaintTexture;
uniform sampler2D uDest;
uniform vec2 uFramebufferSize;

in vec2 vColorTexCoord;
in vec2 vMaskTexCoord;


vec4 sampleSrcColor(){
    float coverage = texture(uStencilTexture, vMaskTexCoord). r;
    vec4 srcRGBA = texture(uPaintTexture, vColorTexCoord);
    return vec4(srcRGBA . rgb, srcRGBA . a * coverage);
}

vec4 sampleDestColor(){
    vec2 destTexCoord = gl_FragCoord . xy / uFramebufferSize;
    return texture(uDest, destTexCoord);
}


vec4 blendColors(vec4 destRGBA, vec4 srcRGBA, vec3 blendedRGB){
    return vec4(srcRGBA . a *(1.0 - destRGBA . a)* srcRGBA . rgb +
                srcRGBA . a * destRGBA . a * blendedRGB +
                (1.0 - srcRGBA . a)* destRGBA . a * destRGBA . rgb,
                1.0);
}

vec3 select3(bvec3 cond, vec3 a, vec3 b){
    return vec3(cond . x ? a . x : b . x, cond . y ? a . y : b . y, cond . z ? a . z : b . z);
}










vec3 convertHSLToRGB(vec3 hsl){
    float a = hsl . y * min(hsl . z, 1.0 - hsl . z);
    vec3 ks = mod(vec3(0.0, 8.0, 4.0)+ vec3(hsl . x * 1.9098593171027443), 12.0);
    return hsl . zzz - clamp(min(ks - vec3(3.0), vec3(9.0)- ks), - 1.0, 1.0)* a;
}


vec3 convertRGBToHSL(vec3 rgb){
    float v = max((rgb . x, rgb . y), rgb . z);
    float c = v - min((rgb . x, rgb . y), rgb . z);
    float l = v - 0.5 * c;

    vec3 tmp = vec3(0.0);
    bvec3 is_v = equal(rgb, vec3(v));
    if(is_v . r)
        tmp = vec3(0.0, rgb . gb);
    else if(is_v . g)
        tmp = vec3(2.0, rgb . br);
    else if(is_v . b)
        tmp = vec3(4.0, rgb . rg);
    float h = 1.0471975511965976 *(tmp . x +(tmp . y - tmp . z)/ c);

    float s = 0.0;
    if(l > 0.0 && l < 1.0)
        s =(v - l)/ min(l, 1.0 - l);

    return vec3(h, s, l);
}

void main(){
    vec4 srcRGBA = sampleSrcColor();
    vec4 destRGBA = sampleDestColor();

    vec3 destHSL = convertRGBToHSL(destRGBA . rgb);
    vec3 srcHSL = convertRGBToHSL(srcRGBA . rgb);
    vec3 blendedHSL = select3(equal(uBlendHSL, ivec3(0)), destHSL, srcHSL);
    vec3 blendedRGB = convertHSLToRGB(blendedHSL);

    oFragColor = blendColors(destRGBA, srcRGBA, blendedRGB);
}