uniform half4 colorGreen, colorRed;

const int[3] values = int[3](1, 1, 1);

inline int indexArray(int index) {
    return values[index];
}

half4 main(float2 coords) {
    int ok = indexArray(0) + indexArray(1) + indexArray(2);
    int undefined = indexArray(-1) + indexArray(3);
    return colorGreen;
}