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












#extension GL_GOOGLE_include_directive : enable

precision highp float;
precision highp sampler2D;

layout(local_size_x = 16, local_size_y = 4)in;

layout(rgba8)uniform image2D uDestImage;
uniform sampler2D uTextureMetadata;
uniform ivec2 uTextureMetadataSize;
uniform sampler2D uColorTexture0;
uniform sampler2D uMaskTexture0;
uniform sampler2D uGammaLUT;
uniform vec2 uTileSize;
uniform vec4 uFilterParams0;
uniform vec4 uFilterParams1;
uniform vec4 uFilterParams2;
uniform vec2 uFramebufferSize;
uniform vec2 uColorTextureSize0;
uniform int uCtrl;
uniform sampler2D uAreaLUT;

layout(std430, binding = 0)buffer bFills {
    restrict readonly uvec2 iFills[];
};

layout(std430, binding = 1)buffer bNextFills {
    restrict readonly int iNextFills[];
};

layout(std430, binding = 2)buffer bFillTileMap {
    restrict readonly int iFillTileMap[];
};

layout(std430, binding = 3)buffer bTiles {
    restrict readonly uint iTiles[];
};

layout(std430, binding = 4)buffer bNextTiles {
    restrict readonly int iNextTiles[];
};

layout(std430, binding = 5)buffer bFirstTiles {
    restrict readonly int iFirstTiles[];
};












vec4 computeCoverage(vec2 from, vec2 to, sampler2D areaLUT){

    vec2 left = from . x < to . x ? from : to, right = from . x < to . x ? to : from;


    vec2 window = clamp(vec2(from . x, to . x), - 0.5, 0.5);
    float offset = mix(window . x, window . y, 0.5)- left . x;
    float t = offset /(right . x - left . x);


    float y = mix(left . y, right . y, t);
    float d =(right . y - left . y)/(right . x - left . x);


    float dX = window . x - window . y;
    return texture(areaLUT, vec2(y + 8.0, abs(d * dX))/ 16.0)* dX;
}












vec4 computeCoverage(vec2 from, vec2 to, sampler2D areaLUT);

ivec2 calculateTileOrigin(uint tileIndex){
    return ivec2(tileIndex & 0xff,(tileIndex >> 8u)& 0xff)* 16;
}

vec4 calculateFillAlpha(ivec2 tileSubCoord, uint tileIndex){
    int fillIndex = iFillTileMap[tileIndex];
    if(fillIndex < 0)
        return vec4(0.0);

    vec4 coverages = vec4(0.0);
    do {
        uvec2 fill = iFills[fillIndex];
        vec2 from = vec2(fill . y & 0xf,(fill . y >> 4u)& 0xf)+
                    vec2(fill . x & 0xff,(fill . x >> 8u)& 0xff)/ 256.0;
        vec2 to = vec2((fill . y >> 8u)& 0xf,(fill . y >> 12u)& 0xf)+
                    vec2((fill . x >> 16u)& 0xff,(fill . x >> 24u)& 0xff)/ 256.0;

        coverages += computeCoverage(from -(vec2(tileSubCoord)+ vec2(0.5)),
                                     to -(vec2(tileSubCoord)+ vec2(0.5)),
                                     uAreaLUT);

        fillIndex = iNextFills[fillIndex];
    } while(fillIndex >= 0);

    return coverages;
}



























































vec4 sampleColor(sampler2D colorTexture, vec2 colorTexCoord){
    return texture(colorTexture, colorTexCoord);
}



vec4 combineColor0(vec4 destColor, vec4 srcColor, int op){
    switch(op){
    case 0x1 :
        return vec4(srcColor . rgb, srcColor . a * destColor . a);
    case 0x2 :
        return vec4(destColor . rgb, srcColor . a * destColor . a);
    }
    return destColor;
}



float filterTextSample1Tap(float offset, sampler2D colorTexture, vec2 colorTexCoord){
    return texture(colorTexture, colorTexCoord + vec2(offset, 0.0)). r;
}


void filterTextSample9Tap(out vec4 outAlphaLeft,
                          out float outAlphaCenter,
                          out vec4 outAlphaRight,
                          sampler2D colorTexture,
                          vec2 colorTexCoord,
                          vec4 kernel,
                          float onePixel){
    bool wide = kernel . x > 0.0;
    outAlphaLeft =
        vec4(wide ? filterTextSample1Tap(- 4.0 * onePixel, colorTexture, colorTexCoord): 0.0,
             filterTextSample1Tap(- 3.0 * onePixel, colorTexture, colorTexCoord),
             filterTextSample1Tap(- 2.0 * onePixel, colorTexture, colorTexCoord),
             filterTextSample1Tap(- 1.0 * onePixel, colorTexture, colorTexCoord));
    outAlphaCenter = filterTextSample1Tap(0.0, colorTexture, colorTexCoord);
    outAlphaRight =
        vec4(filterTextSample1Tap(1.0 * onePixel, colorTexture, colorTexCoord),
             filterTextSample1Tap(2.0 * onePixel, colorTexture, colorTexCoord),
             filterTextSample1Tap(3.0 * onePixel, colorTexture, colorTexCoord),
             wide ? filterTextSample1Tap(4.0 * onePixel, colorTexture, colorTexCoord): 0.0);
}

float filterTextConvolve7Tap(vec4 alpha0, vec3 alpha1, vec4 kernel){
    return dot(alpha0, kernel)+ dot(alpha1, kernel . zyx);
}

float filterTextGammaCorrectChannel(float bgColor, float fgColor, sampler2D gammaLUT){
    return texture(gammaLUT, vec2(fgColor, 1.0 - bgColor)). r;
}


vec3 filterTextGammaCorrect(vec3 bgColor, vec3 fgColor, sampler2D gammaLUT){
    return vec3(filterTextGammaCorrectChannel(bgColor . r, fgColor . r, gammaLUT),
                filterTextGammaCorrectChannel(bgColor . g, fgColor . g, gammaLUT),
                filterTextGammaCorrectChannel(bgColor . b, fgColor . b, gammaLUT));
}






vec4 filterText(vec2 colorTexCoord,
                sampler2D colorTexture,
                sampler2D gammaLUT,
                vec2 colorTextureSize,
                vec4 filterParams0,
                vec4 filterParams1,
                vec4 filterParams2){

    vec4 kernel = filterParams0;
    vec3 bgColor = filterParams1 . rgb;
    vec3 fgColor = filterParams2 . rgb;
    bool gammaCorrectionEnabled = filterParams2 . a != 0.0;


    vec3 alpha;
    if(kernel . w == 0.0){
        alpha = texture(colorTexture, colorTexCoord). rrr;
    } else {
        vec4 alphaLeft, alphaRight;
        float alphaCenter;
        filterTextSample9Tap(alphaLeft,
                             alphaCenter,
                             alphaRight,
                             colorTexture,
                             colorTexCoord,
                             kernel,
                             1.0 / colorTextureSize . x);

        float r = filterTextConvolve7Tap(alphaLeft, vec3(alphaCenter, alphaRight . xy), kernel);
        float g = filterTextConvolve7Tap(vec4(alphaLeft . yzw, alphaCenter), alphaRight . xyz, kernel);
        float b = filterTextConvolve7Tap(vec4(alphaLeft . zw, alphaCenter, alphaRight . x),
                                         alphaRight . yzw,
                                         kernel);

        alpha = vec3(r, g, b);
    }


    if(gammaCorrectionEnabled)
        alpha = filterTextGammaCorrect(bgColor, alpha, gammaLUT);


    return vec4(mix(bgColor, fgColor, alpha), 1.0);
}



























































































vec4 filterRadialGradient(vec2 colorTexCoord,
                          sampler2D colorTexture,
                          vec2 colorTextureSize,
                          vec2 fragCoord,
                          vec2 framebufferSize,
                          vec4 filterParams0,
                          vec4 filterParams1){
    vec2 lineFrom = filterParams0 . xy, lineVector = filterParams0 . zw;
    vec2 radii = filterParams1 . xy, uvOrigin = filterParams1 . zw;

    vec2 dP = colorTexCoord - lineFrom, dC = lineVector;
    float dR = radii . y - radii . x;

    float a = dot(dC, dC)- dR * dR;
    float b = dot(dP, dC)+ radii . x * dR;
    float c = dot(dP, dP)- radii . x * radii . x;
    float discrim = b * b - a * c;

    vec4 color = vec4(0.0);
    if(abs(discrim)>= 0.00001){
        vec2 ts = vec2(sqrt(discrim)* vec2(1.0, - 1.0)+ vec2(b))/ vec2(a);
        if(ts . x > ts . y)
            ts = ts . yx;
        float t = ts . x >= 0.0 ? ts . x : ts . y;
        color = texture(colorTexture, uvOrigin + vec2(clamp(t, 0.0, 1.0), 0.0));
    }

    return color;
}






vec4 filterBlur(vec2 colorTexCoord,
                sampler2D colorTexture,
                vec2 colorTextureSize,
                vec4 filterParams0,
                vec4 filterParams1){

    vec2 srcOffsetScale = filterParams0 . xy / colorTextureSize;
    int support = int(filterParams0 . z);
    vec3 gaussCoeff = filterParams1 . xyz;


    float gaussSum = gaussCoeff . x;
    vec4 color = texture(colorTexture, colorTexCoord)* gaussCoeff . x;
    gaussCoeff . xy *= gaussCoeff . yz;









    for(int i = 1;i <= support;i += 2){
        float gaussPartialSum = gaussCoeff . x;
        gaussCoeff . xy *= gaussCoeff . yz;
        gaussPartialSum += gaussCoeff . x;

        vec2 srcOffset = srcOffsetScale *(float(i)+ gaussCoeff . x / gaussPartialSum);
        color +=(texture(colorTexture, colorTexCoord - srcOffset)+
                  texture(colorTexture, colorTexCoord + srcOffset))* gaussPartialSum;

        gaussSum += 2.0 * gaussPartialSum;
        gaussCoeff . xy *= gaussCoeff . yz;
    }


    return color / gaussSum;
}

vec4 filterNone(vec2 colorTexCoord, sampler2D colorTexture){
    return sampleColor(colorTexture, colorTexCoord);
}

vec4 filterColor(vec2 colorTexCoord,
                 sampler2D colorTexture,
                 sampler2D gammaLUT,
                 vec2 colorTextureSize,
                 vec2 fragCoord,
                 vec2 framebufferSize,
                 vec4 filterParams0,
                 vec4 filterParams1,
                 vec4 filterParams2,
                 int colorFilter){
    switch(colorFilter){
    case 0x1 :
        return filterRadialGradient(colorTexCoord,
                                    colorTexture,
                                    colorTextureSize,
                                    fragCoord,
                                    framebufferSize,
                                    filterParams0,
                                    filterParams1);
    case 0x3 :
        return filterBlur(colorTexCoord,
                          colorTexture,
                          colorTextureSize,
                          filterParams0,
                          filterParams1);
    case 0x2 :
        return filterText(colorTexCoord,
                          colorTexture,
                          gammaLUT,
                          colorTextureSize,
                          filterParams0,
                          filterParams1,
                          filterParams2);
    }
    return filterNone(colorTexCoord, colorTexture);
}



vec3 compositeSelect(bvec3 cond, vec3 ifTrue, vec3 ifFalse){
    return vec3(cond . x ? ifTrue . x : ifFalse . x,
                cond . y ? ifTrue . y : ifFalse . y,
                cond . z ? ifTrue . z : ifFalse . z);
}

float compositeDivide(float num, float denom){
    return denom != 0.0 ? num / denom : 0.0;
}

vec3 compositeColorDodge(vec3 destColor, vec3 srcColor){
    bvec3 destZero = equal(destColor, vec3(0.0)), srcOne = equal(srcColor, vec3(1.0));
    return compositeSelect(destZero,
                           vec3(0.0),
                           compositeSelect(srcOne, vec3(1.0), destColor /(vec3(1.0)- srcColor)));
}


vec3 compositeHSLToRGB(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 compositeRGBToHSL(vec3 rgb){
    float v = max(max(rgb . r, rgb . g), rgb . b), xMin = min(min(rgb . r, rgb . g), rgb . b);
    float c = v - xMin, l = mix(xMin, v, 0.5);
    vec3 terms = rgb . r == v ? vec3(0.0, rgb . gb):
                 rgb . g == v ? vec3(2.0, rgb . br):
                              vec3(4.0, rgb . rg);
    float h = 1.0471975511965976 * compositeDivide(terms . x * c + terms . y - terms . z, c);
    float s = compositeDivide(c, v);
    return vec3(h, s, l);
}

vec3 compositeScreen(vec3 destColor, vec3 srcColor){
    return destColor + srcColor - destColor * srcColor;
}

vec3 compositeHardLight(vec3 destColor, vec3 srcColor){
    return compositeSelect(lessThanEqual(srcColor, vec3(0.5)),
                           destColor * vec3(2.0)* srcColor,
                           compositeScreen(destColor, vec3(2.0)* srcColor - vec3(1.0)));
}

vec3 compositeSoftLight(vec3 destColor, vec3 srcColor){
    vec3 darkenedDestColor =
        compositeSelect(lessThanEqual(destColor, vec3(0.25)),
                        ((vec3(16.0)* destColor - 12.0)* destColor + 4.0)* destColor,
                        sqrt(destColor));
    vec3 factor = compositeSelect(lessThanEqual(srcColor, vec3(0.5)),
                                  destColor *(vec3(1.0)- destColor),
                                  darkenedDestColor - destColor);
    return destColor +(srcColor * 2.0 - 1.0)* factor;
}

vec3 compositeHSL(vec3 destColor, vec3 srcColor, int op){
    switch(op){
    case 0xc :
        return vec3(srcColor . x, destColor . y, destColor . z);
    case 0xd :
        return vec3(destColor . x, srcColor . y, destColor . z);
    case 0xe :
        return vec3(srcColor . x, srcColor . y, destColor . z);
    default :
        return vec3(destColor . x, destColor . y, srcColor . z);
    }
}

vec3 compositeRGB(vec3 destColor, vec3 srcColor, int op){
    switch(op){
    case 0x1 :
        return destColor * srcColor;
    case 0x2 :
        return compositeScreen(destColor, srcColor);
    case 0x3 :
        return compositeHardLight(srcColor, destColor);
    case 0x4 :
        return min(destColor, srcColor);
    case 0x5 :
        return max(destColor, srcColor);
    case 0x6 :
        return compositeColorDodge(destColor, srcColor);
    case 0x7 :
        return vec3(1.0)- compositeColorDodge(vec3(1.0)- destColor, vec3(1.0)- srcColor);
    case 0x8 :
        return compositeHardLight(destColor, srcColor);
    case 0x9 :
        return compositeSoftLight(destColor, srcColor);
    case 0xa :
        return abs(destColor - srcColor);
    case 0xb :
        return destColor + srcColor - vec3(2.0)* destColor * srcColor;
    case 0xc :
    case 0xd :
    case 0xe :
    case 0xf :
        return compositeHSLToRGB(compositeHSL(compositeRGBToHSL(destColor),
                                              compositeRGBToHSL(srcColor),
                                              op));
    }
    return srcColor;
}

vec4 composite(vec4 srcColor,
               sampler2D destTexture,
               vec2 destTextureSize,
               vec2 fragCoord,
               int op){
    if(op == 0x0)
        return srcColor;


    vec2 destTexCoord = fragCoord / destTextureSize;
    vec4 destColor = texture(destTexture, destTexCoord);
    vec3 blendedRGB = compositeRGB(destColor . rgb, srcColor . rgb, op);
    return vec4(srcColor . a *(1.0 - destColor . a)* srcColor . rgb +
                srcColor . a * destColor . a * blendedRGB +
                (1.0 - srcColor . a)* destColor . rgb,
                1.0);
}



float sampleMask(float maskAlpha,
                 sampler2D maskTexture,
                 vec2 maskTextureSize,
                 vec3 maskTexCoord,
                 int maskCtrl){
    if(maskCtrl == 0)
        return maskAlpha;

    ivec2 maskTexCoordI = ivec2(floor(maskTexCoord . xy));
    vec4 texel = texture(maskTexture,(vec2(maskTexCoordI / ivec2(1, 4))+ 0.5)/ maskTextureSize);
    float coverage = texel[maskTexCoordI . y % 4]+ maskTexCoord . z;

    if((maskCtrl & 0x1)!= 0)
        coverage = abs(coverage);
    else
        coverage = 1.0 - abs(1.0 - mod(coverage, 2.0));
    return min(maskAlpha, coverage);
}



vec4 calculateColorWithMaskAlpha(float maskAlpha,
                                 vec4 baseColor,
                                 vec2 colorTexCoord0,
                                 vec2 fragCoord,
                                 int ctrl){

    vec4 color = baseColor;
    int color0Combine =(ctrl >> 6)&
                                       0x3;
    if(color0Combine != 0){
        int color0Filter =(ctrl >> 4)& 0x3;
        vec4 color0 = filterColor(colorTexCoord0,
                                  uColorTexture0,
                                  uGammaLUT,
                                  uColorTextureSize0,
                                  fragCoord,
                                  uFramebufferSize,
                                  uFilterParams0,
                                  uFilterParams1,
                                  uFilterParams2,
                                  color0Filter);
        color = combineColor0(color, color0, color0Combine);
    }


    color . a *= maskAlpha;









    color . rgb *= color . a;
    return color;
}












void lookupTextureMetadata(int color,
                           out mat2 outColorTexMatrix0,
                           out vec4 outColorTexOffsets,
                           out vec4 outBaseColor){
    vec2 textureMetadataScale = vec2(1.0)/ vec2(uTextureMetadataSize);
    vec2 metadataEntryCoord = vec2(color % 128 * 4, color / 128);
    vec2 colorTexMatrix0Coord =(metadataEntryCoord + vec2(0.5, 0.5))* textureMetadataScale;
    vec2 colorTexOffsetsCoord =(metadataEntryCoord + vec2(1.5, 0.5))* textureMetadataScale;
    vec2 baseColorCoord =(metadataEntryCoord + vec2(2.5, 0.5))* textureMetadataScale;
    outColorTexMatrix0 = mat2(texture(uTextureMetadata, colorTexMatrix0Coord));
    outColorTexOffsets = texture(uTextureMetadata, colorTexOffsetsCoord);
    outBaseColor = texture(uTextureMetadata, baseColorCoord);
}




void main(){
    int maskCtrl0 =(uCtrl >> 0)& 0x1;

    vec4 colors[4]= { vec4(0.0), vec4(0.0), vec4(0.0), vec4(0.0)};
    ivec2 tileSubCoord = ivec2(gl_LocalInvocationID . xy)* ivec2(1, 4);
    ivec2 tileOrigin = ivec2(0);

    int tileIndex = iFirstTiles[gl_WorkGroupID . z];
    int overlapCount = 0;

    while(tileIndex >= 0){
        overlapCount ++;

        uint tileCoord = iTiles[tileIndex * 3 + 0];
        uint maskTexCoord = iTiles[tileIndex * 3 + 1];
        uint colorCtrl = iTiles[tileIndex * 3 + 2];

        tileOrigin = ivec2(int(tileCoord & 0xffff), int(tileCoord >> 16));

        int ctrl = int(uCtrl);
        int tileColor = int(colorCtrl & 0xffff);
        int tileCtrl = int(colorCtrl >> 16);

        mat2 colorTexMatrix0;
        vec4 colorTexOffsets;
        vec4 baseColor;
        lookupTextureMetadata(tileColor, colorTexMatrix0, colorTexOffsets, baseColor);

        int maskTileCtrl0 =(tileCtrl >> 0)& 0x3;

        vec4 maskAlphas = vec4(1.0);
        if(maskCtrl0 != 0 && maskTileCtrl0 != 0){
            uint maskTileIndex0 = maskTexCoord & 0xffff;
            int maskTileBackdrop0 = int(maskTexCoord << 8)>> 24;
            maskAlphas = clamp(abs(calculateFillAlpha(tileSubCoord, maskTileIndex0)+
                float(maskTileBackdrop0)), 0.0, 1.0);
        }

        for(int yOffset = 0;yOffset < 4;yOffset ++){

            ivec2 fragCoordI = tileOrigin * ivec2(uTileSize)+ tileSubCoord + ivec2(0, yOffset);
            vec2 fragCoord = vec2(fragCoordI)+ vec2(0.5);
            vec2 colorTexCoord0 = colorTexMatrix0 * fragCoord + colorTexOffsets . xy;
            vec4 color = calculateColorWithMaskAlpha(maskAlphas[yOffset],
                                                     baseColor,
                                                     colorTexCoord0,
                                                     fragCoord,
                                                     ctrl);
            colors[yOffset]= colors[yOffset]*(1.0 - color . a)+ color;
        }

        tileIndex = iNextTiles[tileIndex];
    }

    for(int yOffset = 0;yOffset < 4;yOffset ++){
        ivec2 fragCoord = tileOrigin * ivec2(uTileSize)+ tileSubCoord + ivec2(0, yOffset);


        vec4 color = colors[yOffset];
        if(color . a < 1.0)
            color = imageLoad(uDestImage, fragCoord)*(1.0 - color . a)+ color;
        imageStore(uDestImage, fragCoord, color);
    }
}