Enables a luminance blender mode. allegro game programming library.
#include <allegro.h>
void set_luminance_blender(int r, int g, int b, int a);
Enables a luminance blender mode for combining translucent or lit truecolor pixels. Applies the luminance of the source to the destination. The colour of the destination is not affected.
set_trans_blender(3alleg4), drawing_mode(3alleg4)