uniform half4 inputVal;
uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    const half4 constVec = half4(20, 0, 0, 0);
    half4 expectedVec = half4(1, 0, 0, 0);

    return (normalize(inputVal.x)    == expectedVec.x       &&
            normalize(inputVal.xy)   == expectedVec.xy      &&
            normalize(inputVal.xyz)  == expectedVec.xyz     &&
            normalize(inputVal.xyzw) == expectedVec.xyzw    &&
            normalize(constVec.x)    == expectedVec.x       &&
            normalize(constVec.yx)   == expectedVec.yx      &&
            normalize(constVec.zxy)  == expectedVec.zxy     &&
            normalize(constVec.xyzw) == expectedVec.xyzw) ? colorGreen : colorRed;
}