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al_set_separate_blender(3)  Library Functions Manual  al_set_separate_blender(3)

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(3), 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 combined in a different
     way than the color components.

SEE ALSO
     al_set_blender(3), al_get_blender(3), al_get_separate_blender(3)

Allegro reference manual			      al_set_separate_blender(3)

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