uniform half4 testInputs;
uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    half4 expected = half4(-1, 0, 1, 3);
    return (ceil(testInputs.x)    == expected.x     &&
            ceil(testInputs.xy)   == expected.xy    &&
            ceil(testInputs.xyz)  == expected.xyz   &&
            ceil(testInputs.xyzw) == expected.xyzw) ? colorGreen : colorRed;
}