void unity_with_alpha
    (output varying half rOut,
     output varying half gOut,
     output varying half bOut,
     output varying half aOut,
     input varying half rIn,
     input varying half gIn,
     input varying half bIn,
     input varying half aIn)
{
    rOut=rIn;
	gOut=gIn;
	bOut=bIn;
    aOut=aIn;
}
