al_set_separate_blender
void al_set_separate_blender(int op, int src, int dst,
int alpha_op, int alpha_src, int alpha_dst)
Like al_set_blender, 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, al_get_blender, al_get_separate_blender
Examples: ex_blend2, ex_blend_test, ex_logo
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