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| |
| #ifndef MONO_CHANNEL_GLSLLIB |
| #define MONO_CHANNEL_GLSLLIB |
| |
| #ifdef QSSG_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 ) / 3.0 ); |
| case mono_luminance : |
| return( luminance( t.xyz ) ); |
| case mono_maximum : |
| return( max( t.x, max( t.y, t.z ) ) ); |
| default : |
| return( 1.0 ); |
| } |
| } |
| |
| #endif |