A function pointer used for callbacks that watch the event queue.
Defined in SDL_events.h
typedef int (SDLCALL * SDL_EventFilter) (void *userdata, SDL_Event * event);| userdata | what was passed as userdata to SDL_SetEventFilter() or SDL_AddEventWatch, etc. |
| event | the event that triggered the callback. |
Returns 1 to permit event to be added to the queue, and 0 to disallow it. When used with SDL_AddEventWatch, the return value is ignored.