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Optimized SDL_HasEvent() and SDL_HasEvents()

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Also document the counting behavior of SDL_PEEKEVENT.

Fixes https://github.com/libsdl-org/SDL/issues/6209
This commit is contained in:
Sam Lantinga
2024-09-25 21:20:00 -07:00
parent 3abb213083
commit d9a7da4fac
2 changed files with 19 additions and 3 deletions
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2
include/SDL3/SDL_events.h
View File

@@ -1011,7 +1011,7 @@ typedef enum SDL_EventAction
* event queue.
* - `SDL_PEEKEVENT`: `numevents` events at the front of the event queue,
* within the specified minimum and maximum type, will be returned to the
* caller and will _not_ be removed from the queue.
* caller and will _not_ be removed from the queue. If you pass NULL for `events`, then `numevents` is ignored and the total number of matching events will be returned.
* - `SDL_GETEVENT`: up to `numevents` events at the front of the event queue,
* within the specified minimum and maximum type, will be returned to the
* caller and will be removed from the queue.

20
src/events/SDL_events.c
View File

@@ -1105,12 +1105,28 @@ int SDL_PeepEvents(SDL_Event *events, int numevents, SDL_EventAction action,
bool SDL_HasEvent(Uint32 type)
{
return SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, type, type) > 0;
return SDL_HasEvents(type, type);
}
bool SDL_HasEvents(Uint32 minType, Uint32 maxType)
{
return SDL_PeepEvents(NULL, 0, SDL_PEEKEVENT, minType, maxType) > 0;
bool found = false;
SDL_LockMutex(SDL_EventQ.lock);
{
if (SDL_EventQ.active) {
for (SDL_EventEntry *entry = SDL_EventQ.head; entry; entry = entry->next) {
const Uint32 type = entry->event.type;
if (minType <= type && type <= maxType) {
found = true;
break;
}
}
}
}
SDL_UnlockMutex(SDL_EventQ.lock);
return found;
}
void SDL_FlushEvent(Uint32 type)