1uniform half4 testInputs;  // equals (-1.25, 0, 0.75, 2.25)
2uniform half4 colorGreen, colorRed;
3
4half4 main(float2 coords) {
5    const half4 constVal = half4(-1.25, 0, 0.75, 2.25);
6    half4 expected = half4(-1, 0, 1, 1);
7    return (sign(testInputs.x)    == expected.x &&
8            sign(testInputs.xy)   == expected.xy &&
9            sign(testInputs.xyz)  == expected.xyz &&
10            sign(testInputs.xyzw) == expected.xyzw &&
11            sign(constVal.x)      == expected.x &&
12            sign(constVal.xy)     == expected.xy &&
13            sign(constVal.xyz)    == expected.xyz &&
14            sign(constVal.xyzw)   == expected.xyzw) ? colorGreen : colorRed;
15}
16