Open a haptic device for use.
int device_index);SDL_Haptic* SDL_HapticOpen(
index of the device to open
Returns the device identifier or NULL on failure; call SDL_GetError() for more information.
The index passed as an argument refers to the N'th haptic device on this system.
When opening a haptic device, its gain will be set to maximum and autocenter will be disabled. To modify these values use SDL_HapticSetGain() and SDL_HapticSetAutocenter().
This function is available since SDL 2.0.0.