tests/sksl/blend/BlendColor.glsl

#version 400
out vec4 sk_FragColor;
in vec4 src;
in vec4 dst;
vec3 _blend_set_color_luminance(vec3 hueSatColor, float alpha, vec3 lumColor) {
    float lum = dot(vec3(0.30000001192092896, 0.5899999737739563, 0.10999999940395355), lumColor);
    vec3 result = (lum - dot(vec3(0.30000001192092896, 0.5899999737739563, 0.10999999940395355), hueSatColor)) + hueSatColor;
    float minComp = min(min(result.x, result.y), result.z);
    float maxComp = max(max(result.x, result.y), result.z);
    if (minComp < 0.0 && lum != minComp) {
        float _4_d = lum - minComp;
        result = lum + (result - lum) * (lum / _4_d);
    }
    if (maxComp > alpha && maxComp != lum) {
        vec3 _5_n = (result - lum) * (alpha - lum);
        float _6_d = maxComp - lum;
        return lum + _5_n / _6_d;
    } else {
        return result;
    }
}
vec4 blend_color(vec4 src, vec4 dst) {
    float alpha = dst.w * src.w;
    vec3 sda = src.xyz * dst.w;
    vec3 dsa = dst.xyz * src.w;
    return vec4((((_blend_set_color_luminance(sda, alpha, dsa) + dst.xyz) - dsa) + src.xyz) - sda, (src.w + dst.w) - alpha);
}
void main() {
    sk_FragColor = blend_color(src, dst);
}