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al_get_opengl_texture(3)                              al_get_opengl_texture(3)

NAME
       al_get_opengl_texture - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_opengl.h>

              GLuint al_get_opengl_texture(ALLEGRO_BITMAP *bitmap)

DESCRIPTION
       Returns the OpenGL texture id internally used by the given bitmap if it
       uses one, else 0.

       Example:

              bitmap = al_load_bitmap("my_texture.png");
              texture = al_get_opengl_texture(bitmap);
              if (texture != 0)
                  glBindTexture(GL_TEXTURE_2D, texture);

Allegro reference manual                              al_get_opengl_texture(3)