Provided by: allegro5-doc_5.2.9.1+dfsg-1.1build4_all 

NAME
al_set_separate_blender - Allegro 5 API
SYNOPSIS
#include <allegro5/allegro.h>
void al_set_separate_blender(int op, int src, int dst,
int alpha_op, int alpha_src, int alpha_dst)
DESCRIPTION
Like al_set_blender(3alleg5), but allows specifying a separate blending operation for the alpha channel.
This is useful if your target bitmap also has an alpha channel and the two alpha channels need to be com‐
bined in a different way than the color components.
SEE ALSO
al_set_blender(3alleg5), al_get_blender(3alleg5), al_get_separate_blender(3alleg5)
Allegro reference manual al_set_separate_blender(3alleg5)