tests/sksl/blend/BlendDstIn.metal

struct Uniforms {
    float4 src;
    float4 dst;
};
struct Inputs {
};
struct Outputs {
    float4 sk_FragColor [[color(0)]];
};

fragment Outputs fragmentMain(Inputs _in [[stage_in]], constant Uniforms& _uniforms [[buffer(0)]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
    Outputs _out;
    (void)_out;
    _out.sk_FragColor = _uniforms.dst * _uniforms.src.w;
    return _out;
}