uniform half4 colorGreen, colorRed;

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

    bool ok = true;

    // Literal test
    ok = ok && (true ? true : false);
    ok = ok && (false ? false : true);

    // Constant boolean test
    ok = ok && (TRUE ? true : false);
    ok = ok && (FALSE ? false : true);

    // Constant-foldable test
    ok = ok && (1 == 1 ? true : false);
    ok = ok && (0 == 1 ? false : true);

    // Unknown-value test
    ok = ok && (colorGreen.g == 1 ? true : false);
    ok = ok && (colorGreen.r == 1 ? false : true);

    return ok ? colorGreen : colorRed;
}