al_get_blender - Allegro 5 API

       Returns  the  active blender for the current thread.  You can pass NULL for values you are not interested
       in.

       al_get_blender - Allegro 5 API

al_set_blender(3alleg5), al_get_separate_blender(3alleg5)

Allegro reference manual                                                                 al_get_blender(3alleg5)

              #include <allegro5/allegro.h>

              void al_get_blender(int *op, int *src, int *dst)