al_get_new_bitmap_depth(3)                            Library Functions Manual

NAME
       al_get_new_bitmap_depth - Allegro 5 API

SYNOPSIS
              #include <allegro5/allegro.h>

              int al_get_new_bitmap_depth(void)

DESCRIPTION
       Returns the value currently set with al_set_new_bitmap_depth(3) on the
       current thread or 0 if none was set.

SINCE
       5.2.1

              [Unstable API]: This is an experimental feature and currently
              only works for the OpenGL backend.

Allegro reference manual                            al_get_new_bitmap_depth(3)