al_set_target_backbuffer - Allegro 5 API

       Same as al_set_target_bitmap(al_get_backbuffer(display));

       al_set_target_backbuffer - Allegro 5 API

al_set_target_bitmap(3alleg5), al_get_backbuffer(3alleg5)

Allegro reference manual                                                       al_set_target_backbuffer(3alleg5)

              #include <allegro5/allegro.h>

              void al_set_target_backbuffer(ALLEGRO_DISPLAY *display)