uniform half4 colorGreen, colorRed;
uniform half2x2 testMatrix2x2;
uniform half3x3 testMatrix3x3;

bool test_equality() {
    bool ok = true;
    ok = ok && testMatrix2x2 == half2x2(1,2,3,4);
    ok = ok && testMatrix3x3 == half3x3(1,2,3,4,5,6,7,8,9);
    ok = ok && testMatrix2x2 != half2x2(100);
    ok = ok && testMatrix3x3 != half3x3(9,8,7,6,5,4,3,2,1);
    return ok;
}

half4 main(float2 coords) {
    return test_equality() ? colorGreen : colorRed;
}