Blend Complex values

Darken (float4 a, float4 b) { return float4(min(a.rgb, b.rgb), 1); }

Multiply (float4 a, float4 b) { return (a * b); }

ColorBurn (float4 a, float4 b) { return (1-(1-a)/b); }

LinearBurn (float4 a, float4 b) { return (a+b-1); }

Lighten (float4 a, float4 b)  {  return float4(max(a.rgb, b.rgb), 1);  }

Screen (float4 a, float4 b) { return (1-(1-a)*(1-b)); }

ColorDodge (float4 a, float4 b) { return (a/(1-b)); }

LinearDodge (float4 a, float4 b) { return (a+b); }

Overlay (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (a.r > 0.5) { r.r = 1-(1-2*(a.r-0.5))*(1-b.r); }
    else { r.r = (2*a.r)*b.r; }
    if (a.g > 0.5) { r.g = 1-(1-2*(a.g-0.5))*(1-b.g); }
    else { r.g = (2*a.g)*b.g; }
    if (a.b > 0.5) { r.b = 1-(1-2*(a.b-0.5))*(1-b.b); }
    else { r.b = (2*a.b)*b.b; }
    return r;

}

SoftLight (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (b.r > 0.5) { r.r = a.r*(1-(1-a.r)*(1-2*(b.r))); }
    else { r.r = 1-(1-a.r)*(1-(a.r*(2*b.r))); }
    if (b.g > 0.5) { r.g = a.g*(1-(1-a.g)*(1-2*(b.g))); }
    else { r.g = 1-(1-a.g)*(1-(a.g*(2*b.g))); }
    if (b.b > 0.5) { r.b = a.b*(1-(1-a.b)*(1-2*(b.b))); }
    else { r.b = 1-(1-a.b)*(1-(a.b*(2*b.b))); }
    return r;
}

HardLight (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (b.r > 0.5) { r.r = 1-(1-a.r)*(1-2*(b.r)); }
    else { r.r = a.r*(2*b.r); }
    if (b.g > 0.5) { r.g = 1-(1-a.g)*(1-2*(b.g)); }
    else { r.g = a.g*(2*b.g); }
    if (b.b > 0.5) { r.b = 1-(1-a.b)*(1-2*(b.b)); }
    else { r.b = a.b*(2*b.b); }
    return r;
}

VividLight (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (b.r > 0.5) { r.r = 1-(1-a.r)/(2*(b.r-0.5)); }
    else { r.r = a.r/(1-2*b.r); }
    if (b.g > 0.5) { r.g = 1-(1-a.g)/(2*(b.g-0.5)); }
    else { r.g = a.g/(1-2*b.g); }
    if (b.b > 0.5) { r.b = 1-(1-a.b)/(2*(b.b-0.5)); }
    else { r.b = a.b/(1-2*b.b); }
    return r;
}

LinearLight (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (b.r > 0.5) { r.r = a.r+2*(b.r-0.5); }
    else { r.r = a.r+2*b.r-1; }
    if (b.g > 0.5) { r.g = a.g+2*(b.g-0.5); }
    else { r.g = a.g+2*b.g-1; }
    if (b.b > 0.5) { r.b = a.b+2*(b.b-0.5); }
    else { r.b = a.b+2*b.b-1; }
    return r;
}

PinLight (float4 a, float4 b) {float4 r = float4(0,0,0,1);

    if (b.r > 0.5) { r.r = max(a.r, 2*(b.r-0.5)); }
    else { r.r = min(a.r, 2*b.r); }
    if (b.g > 0.5) { r.g = max(a.g, 2*(b.g-0.5)); }
    else { r.g = min(a.g, 2*b.g); }
    if (b.b > 0.5) { r.b = max(a.b, 2*(b.b-0.5)); }
    else { r.b = min(a.b, 2*b.b); }
    return r;
}

Difference (float4 a, float4 b) { return (abs(a-b)); }

Exclusion (float4 a, float4 b) { return (0.5-2*(a-0.5)*(b-0.5)); }