al_is_d3d_device_lost - Allegro 5 API

       Returns  a  boolean  indicating whether or not the Direct3D device belonging to the given display is in a
       lost state.

       Parameters:

       • display - The display that the device you wish to check is attached to

Allegro reference manual                                                          al_is_d3d_device_lost(3alleg5)

       al_is_d3d_device_lost - Allegro 5 API

              #include <allegro5/allegro_direct3d.h>

              bool al_is_d3d_device_lost(ALLEGRO_DISPLAY *display)