al_set_haptic_autocenter - Allegro 5 API

       Turns  on  or  off  the  automatic centering feature of the haptic device if supported.  Depending on the
       device automatic centering may ensure that the axes of the device are centered again automatically  after
       playing a haptic effect.  The intensity parameter should be passed with a value between 0.0 and 1.0.  The
       value  0.0  means  automatic centering is disabled, and 1.0 means full strength automatic centering.  Any
       value in between those two extremes will result in partial automatic centering.  Some  platforms  do  not
       support  partial  automatic  centering.   If that is the case, a value of less than 0.5 will turn it off,
       while a value equal to or higher to 0.5 will turn it on.  Returns true if set successfully, false if not.
       Can    only    work    if    al_get_haptic_capabilities(3alleg5)    returns    a    value    that     has
       ALLEGRO_HAPTIC_AUTOCENTER(3alleg5)ALLEGRO_HAPTIC_CONSTANTS(3alleg5)  set.   If not, this function returns
       false.

       al_set_haptic_autocenter - Allegro 5 API

       5.1.9

              [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_set_haptic_autocenter(3alleg5)

              #include <allegro5/allegro.h>

              bool al_set_haptic_autocenter(ALLEGRO_HAPTIC *hap, double intensity)