uniform float2x2 testMatrix2x2;
uniform half4 colorGreen, colorRed;

half4 main(float2 coords) {
    const float4 constVal = float4(-1, 0, 1, 2);
    const uint4 expectedA = uint4(0xBF800000, 0x00000000, 0x3F800000, 0x40000000);

    float4 inputVal = float4(testMatrix2x2) * float4(1, 1, -1, -1);
    uint4 expectedB = uint4(0x3F800000, 0x40000000, 0xC0400000, 0xC0800000);

    return (constVal.x    == uintBitsToFloat(expectedA.x)    &&
            constVal.xy   == uintBitsToFloat(expectedA.xy)   &&
            constVal.xyz  == uintBitsToFloat(expectedA.xyz)  &&
            constVal.xyzw == uintBitsToFloat(expectedA.xyzw) &&
            inputVal.x    == uintBitsToFloat(expectedB.x)    &&
            inputVal.xy   == uintBitsToFloat(expectedB.xy)   &&
            inputVal.xyz  == uintBitsToFloat(expectedB.xyz)  &&
            inputVal.xyzw == uintBitsToFloat(expectedB.xyzw)) ? colorGreen : colorRed;
}