al_get_haptic_from_touch_input - Allegro 5 API

       If  the  touch  input  device  has  haptic  capabilities,  returns  the  associated haptic device handle.
       Otherwise returns NULL.

       al_get_haptic_from_touch_input - Allegro 5 API

       5.1.8

              [UnstableAPI]: Perhaps could be simplified due to limited support for all  the  exposed  features
              across all of the platforms.  Awaiting feedback from users.

Allegro reference manual                                                 al_get_haptic_from_touch_input(3alleg5)

              #include <allegro5/allegro.h>

              ALLEGRO_HAPTIC *al_get_haptic_from_touch_input(ALLEGRO_TOUCH_INPUT *dev)