al_get_haptic_effect_duration man page
al_get_haptic_effect_duration — Allegro 5 API
#include <allegro5/allegro.h> double al_get_haptic_effect_duration(ALLEGRO_HAPTIC_EFFECT * effect)
Returns the estimated duration in seconds of a single loop of the given haptic effect. The effect's
effect.replay must have been filled in correctly before using this function.
[Unstable API]: Perhaps could be simplified due to limited support for all the exposed features across all of the platforms. Awaiting feedback from users.