Allegro 5 api
#include <allegro5/allegro_opengl.h> void al_get_opengl_texture_size(ALLEGRO_BITMAP *bitmap, int *w, int *h)
Retrieves the size of the texture used for the bitmap. This can be different from the bitmap size if OpenGL only supports power-of-two sizes or if it is a sub-bitmap. 0\[aq]s are returned if the bitmap is not an OpenGL bitmap.
al_get_opengl_texture_position(3alleg5)