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#ifndef MONO_CHANNEL_GLSLLIB
#define MONO_CHANNEL_GLSLLIB
#ifdef UIC_DEFINE_API
#define mono_alpha 0
#define mono_average 1
#define mono_luminance 2
#define mono_maximum 3
#endif
float monoChannel( in vec4 t, in int monoSource )
{
switch( monoSource )
{
case mono_alpha :
return( t.w );
case mono_average :
return( ( t.x + t.y + t.z ) / 3.0f );
case mono_luminance :
return( luminance( t.xyz ) );
case mono_maximum :
return( max( t.x, max( t.y, t.z ) ) );
default :
return( 1.0f );
}
}
#endif
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