uniform half4 colorGreen, colorRed;
uniform float3x3 testMatrix3x3;
uniform float4x4 testMatrix4x4;

bool test3x3() {
    float3 expected = float3(3, 2, 1);
    float3 vec;
    for (int c=0; c<3; ++c) {
        for (int r=0; r<3; ++r) {
            vec.zyx[r] = testMatrix3x3[c][r];
        }
        if (vec != expected) {
            return false;
        }
        expected += 3;
    }
    return true;
}

bool test4x4() {
    float4 expected = float4(4, 3, 2, 1);
    float4 vec;
    for (int c=0; c<4; ++c) {
        for (int r=0; r<4; ++r) {
            vec.wzyx[r] = testMatrix4x4[c][r];
        }
        if (vec != expected) {
            return false;
        }
        expected += 4;
    }
    return true;
}

half4 main(float2 coords) {
    return test3x3() && test4x4() ? colorGreen : colorRed;
}