uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    const bool TRUE = true;
    const bool FALSE = false;

    int check = 0;

    // Literal test
    check += (true ? 0 : 1);
    check += (false ? 1 : 0);

    // Constant boolean test
    check += (TRUE ? 0 : 1);
    check += (FALSE ? 1 : 0);

    // Constant-foldable test
    check += (1 == 1 ? 0 : 1);
    check += (0 == 1 ? 1 : 0);

    // Unknown-value test
    check += (colorGreen.g == 1 ? 0 : 1);
    check += (colorGreen.r == 1 ? 1 : 0);

    // Composite comparison test.
    check += (colorGreen.gr == colorRed.rg ? 0 : 1);
    check += (colorGreen.gr != colorRed.rg ? 1 : 0);

    return check == 0 ? colorGreen : colorRed;
}