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LIBRETRO: rework delayMillis

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This commit is contained in:
Giovanni Cascione 2023-05-04 12:15:03 +02:00
parent b71a9808a6
commit b84bc71c25
1 changed files with 18 additions and 25 deletions
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43
backends/platform/libretro/src/libretro-os.cpp
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@ -651,6 +651,7 @@ public:
virtual bool pollEvent(Common::Event &event) {
_threadSwitchCaller = THREAD_SWITCH_POLL;
((LibretroTimerManager *)_timerManager)->checkThread();
if (!_events.empty()) {
event = _events.front();
_events.pop_front();
@ -676,35 +677,27 @@ public:
}
virtual void delayMillis(uint msecs) {
// Implement 'non-blocking' sleep...
uint32 start_time = getMillis();
_threadSwitchCaller = THREAD_SWITCH_DELAY;
if (timing_inaccuracies_is_enabled()) {
// Use janky inaccurate method...
uint32 elapsed_time = 0;
uint32 time_remaining = msecs;
while (time_remaining > 0) {
// If delay would take us past the next
// thread exit time, exit the thread immediately
// (i.e. start burning delay time in the main RetroArch
// thread as soon as possible...)
((LibretroTimerManager *)_timerManager)->checkThread(time_remaining);
// Check how much delay time remains...
elapsed_time = getMillis() - start_time;
if (time_remaining > elapsed_time) {
time_remaining -= elapsed_time;
usleep(1000);
} else {
time_remaining = 0;
}
}
} else {
// Use accurate method...
while (getMillis() < start_time + msecs) {
((LibretroTimerManager *)_timerManager)->checkThread();
uint32 elapsed_time = 0;
uint32 time_remaining = msecs;
while (time_remaining > 0) {
/* if remaining delay is lower than last amount of time spent on main thread, burn it in emu thread
to improve accuracy */
if (time_remaining >= ((LibretroTimerManager *)_timerManager)->spentOnMainThread()) {
/* If timing inaccuracies is enabled, when remaining delay would take us past the next
thread switch time, we switch immediately in order to burn as much as possible delay time in the main RetroArch
thread as soon as possible. */
if (timing_inaccuracies_is_enabled() && time_remaining >= ((LibretroTimerManager *)_timerManager)->timeToNextSwitch())
((LibretroTimerManager *)_timerManager)->switchThread();
else
((LibretroTimerManager *)_timerManager)->checkThread();
} else
usleep(1000);
}
elapsed_time = getMillis() - start_time;
time_remaining = time_remaining > elapsed_time ? time_remaining - elapsed_time : 0;
}
}