uniform half4 inputH4, expectedH4;
uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    bool4 input = bool4(inputH4);
    bool4 expected = bool4(expectedH4);
    const bool4 constVal = bool4(true, false, true, false);
    return (not(input.xy)      == expected.xy    &&
            not(input.xyz)     == expected.xyz   &&
            not(input.xyzw)    == expected.xyzw  &&
            not(constVal.xy)   == expected.xy    &&
            not(constVal.xyz)  == expected.xyz   &&
            not(constVal.xyzw) == expected.xyzw) ? colorGreen : colorRed;
}