al_get_opengl_texture_position - Man Page

#include <allegro5/allegro_opengl.h>

void al_get_opengl_texture_position(ALLEGRO_BITMAP *bitmap, int *u, int *v)

Returns the u/v coordinates for the top/left corner of the bitmap within the used texture, in pixels.

al_get_opengl_texture_size(3)

al_get_opengl_texture_size(3).