Query the current event filter.
SDL_bool SDL_GetEventFilter(SDL_EventFilter * filter,void **userdata);
|filter||the current callback function will be stored here|
|userdata||the pointer that is passed to the current event filter will be stored here|
Returns SDL_TRUE on success or SDL_FALSE if there is no event filter set.
This function can be used to "chain" filters, by saving the existing filter before replacing it with a function that will call that saved filter.
This function is available since SDL 2.0.0.