uniform half  unknownInput;
uniform half4 colorRed, colorGreen;

bool test_half() {
    half unknown = unknownInput;

    bool ok = true;
    ok = ok &&  (half4(half2(1), half2(2, 3)) + half4(5, 6, 7, 8)) == half4(6, 7, 9, 11);
    ok = ok &&  (half4(8, half3(10)) - half4(1))                   == half4(7, 9, 9, 9);
    ok = ok &&  (half4(2) * half4(1, 2, 3, 4))                     == half4(2, 4, 6, 8);
    ok = ok &&  (half4(12) / half4(1, 2, 3, 4))                    == half4(12, 6, 4, 3);
    ok = ok && !(half4(1) == half4(2));
    ok = ok &&  (half2(1) == half2(1, 1));
    ok = ok &&  (half2(1, 1) == half2(1, 1));
    ok = ok && !(half2(1) == half2(1, 0));
    ok = ok &&  (half4(1) == half4(half2(1), half2(1)));
    ok = ok &&  (half4(half3(1), 1) == half4(half2(1), half2(1)));
    ok = ok && !(half4(half3(1), 1) == half4(half2(1), 1, 0));
    ok = ok &&  (half2(1) != half2(1, 0));
    ok = ok && !(half4(1) != half4(half2(1), half2(1)));
    ok = ok &&  ( half4(1) ==  half4(1));
    ok = ok &&  (-half4(1) == -half4(1));
    ok = ok &&  ( half4(1) != -half4(1));
    ok = ok &&  (-half4(1) !=  half4(1));
    ok = ok &&  ( half4(0) != -half4(1));
    ok = ok &&  (-half4(0) !=  half4(1));
    ok = ok &&  (-half4(0) != -half4(1));
    ok = ok && !(-half4(1) ==  half4(1));
    ok = ok && !( half4(1) == -half4(1));
    ok = ok && !( half4(0) ==  half4(1));
    ok = ok && !( half4(0) == -half4(1));
    ok = ok && !(-half4(0) ==  half4(1));
    ok = ok && !(-half4(0) == -half4(1));
    ok = ok && !(-half4(1) != -half4(1));
    ok = ok &&  (half4(unknown) * half4(1) == half4(unknown));
    ok = ok &&  (half4(1) * half4(unknown) == half4(unknown));
    ok = ok &&  (half4(unknown) * half4(0) == half4(0));
    ok = ok &&  (half4(0) * half4(unknown) == half4(0));
    ok = ok &&  (half4(0) / half4(unknown) == half4(0));  // this should NOT optimize away
    ok = ok &&  (half4(unknown) + half4(0) == half4(unknown));
    ok = ok &&  (half4(0) + half4(unknown) == half4(unknown));
    ok = ok &&  (half4(unknown) - half4(0) == half4(unknown));

    half4 val = half4(unknown);
    val += half4(1);
    val += half4(0);
    val -= half4(1);
    val -= half4(0);
    val = val + half4(1);
    val = val + half4(0);
    val = val - half4(1);
    val = val - half4(0);
    ok = ok && (val == half4(unknown));
    val *= half4(1);
    val *= half4(2);
    val /= half4(1);
    val /= half4(2);
    val = val * half4(1);
    val = val * half4(2);
    val = val / half4(1);
    val = val / half4(2);
    ok = ok && (val == half4(unknown));

    return ok;
}

bool test_int() {
    int unknown = int(unknownInput);

    bool ok = true;
    ok = ok &&  (int4(int2(1), int2(2, 3)) + int4(5, 6, 7, 8)) == int4(6, 7, 9, 11);
    ok = ok &&  (int4(8, int3(10)) - int4(1))                  == int4(7, 9, 9, 9);
    ok = ok &&  (int4(2) * int4(1, 2, 3, 4))                   == int4(2, 4, 6, 8);
    ok = ok &&  (int4(12) / int4(1, 2, 3, 4))                  == int4(12, 6, 4, 3);
    ok = ok && !(int4(1) == int4(2));
    ok = ok &&  (int2(1) == int2(1, 1));
    ok = ok &&  (int2(1, 1) == int2(1, 1));
    ok = ok && !(int2(1) == int2(1, 0));
    ok = ok &&  (int4(1) == int4(int2(1), int2(1)));
    ok = ok &&  (int4(int3(1), 1) == int4(int2(1), int2(1)));
    ok = ok && !(int4(int3(1), 1) == int4(int2(1), 1, 0));
    ok = ok &&  (int2(1) != int2(1, 0));
    ok = ok && !(int4(1) != int4(int2(1), int2(1)));
    ok = ok &&  ( int4(1) ==  int4(1));
    ok = ok &&  (-int4(1) == -int4(1));
    ok = ok &&  ( int4(1) != -int4(1));
    ok = ok &&  (-int4(1) !=  int4(1));
    ok = ok &&  ( int4(0) != -int4(1));
    ok = ok &&  (-int4(0) !=  int4(1));
    ok = ok &&  (-int4(0) != -int4(1));
    ok = ok && !(-int4(1) ==  int4(1));
    ok = ok && !( int4(1) == -int4(1));
    ok = ok && !( int4(0) ==  int4(1));
    ok = ok && !( int4(0) == -int4(1));
    ok = ok && !(-int4(0) ==  int4(1));
    ok = ok && !(-int4(0) == -int4(1));
    ok = ok && !(-int4(1) != -int4(1));
    ok = ok &&  (int4(unknown) * int4(1) == int4(unknown));
    ok = ok &&  (int4(1) * int4(unknown) == int4(unknown));
    ok = ok &&  (int4(unknown) * int4(0) == int4(0));
    ok = ok &&  (int4(0) * int4(unknown) == int4(0));
    ok = ok &&  (int4(0) / int4(unknown) == int4(0));
    ok = ok &&  (int4(unknown) + int4(0) == int4(unknown));
    ok = ok &&  (int4(0) + int4(unknown) == int4(unknown));
    ok = ok &&  (int4(unknown) - int4(0) == int4(unknown));

    int4 val = int4(unknown);
    val += int4(1);
    val += int4(0);
    val -= int4(1);
    val -= int4(0);
    val = val + int4(1);
    val = val + int4(0);
    val = val - int4(1);
    val = val - int4(0);
    ok = ok && (val == int4(unknown));
    val *= int4(1);
    val *= int4(2);
    val /= int4(1);
    val /= int4(2);
    val = val * int4(1);
    val = val * int4(2);
    val = val / int4(1);
    val = val / int4(2);
    ok = ok && (val == int4(unknown));

    return ok;
}

half4 main(float2 coords) {
    return test_half() && test_int() ? colorGreen : colorRed;
}