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Pump events each time through the loop in SDL_WaitEventTimeout_Device()

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Not only is it more efficient to batch process pending events, it is
necessary for correctness with the Win32 backend. WIN_PumpEvents() runs
periodic updates of the cursor clip region and disambiguation of
left and right shift keys in addition to standard event processing.
This commit is contained in:
Cameron Gutman 2021-06-12 17:56:52 -05:00 committed by Sam Lantinga
parent 105de64c2d
commit 7948c16df2
1 changed files with 7 additions and 3 deletions
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10
src/events/SDL_events.c
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@ -788,10 +788,14 @@ SDL_PollEvent(SDL_Event * event)
static int
SDL_WaitEventTimeout_Device(_THIS, SDL_Window *wakeup_window, SDL_Event * event, int timeout)
{
/* Release any keys held down from last frame */
SDL_ReleaseAutoReleaseKeys();
for (;;) {
/* Pump events on entry and each time we wake to ensure:
a) All pending events are batch processed after waking up from a wait
b) Waiting can be completely skipped if events are already available to be pumped
c) Periodic processing that takes place in some platform PumpEvents() functions happens
*/
SDL_PumpEvents();
if (!_this->wakeup_lock || SDL_LockMutex(_this->wakeup_lock) == 0) {
int status = SDL_PeepEvents(event, 1, SDL_GETEVENT, SDL_FIRSTEVENT, SDL_LASTEVENT);
/* If status == 0 we are going to block so wakeup will be needed. */