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System: Make inter-frame sleep slightly more precise

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This commit is contained in:
Connor McLaughlin 2022-07-30 00:45:26 +10:00
parent 66caaf6103
commit b074c0d1ee
1 changed files with 19 additions and 4 deletions
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17
src/common/timer.cpp
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@ -27,9 +27,13 @@ static HANDLE GetSleepTimer()
return s_sleep_timer; return s_sleep_timer;
s_sleep_timer_created = true; s_sleep_timer_created = true;
s_sleep_timer = CreateWaitableTimerEx(nullptr, nullptr, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
if (!s_sleep_timer)
{
s_sleep_timer = CreateWaitableTimer(nullptr, TRUE, nullptr); s_sleep_timer = CreateWaitableTimer(nullptr, TRUE, nullptr);
if (!s_sleep_timer) if (!s_sleep_timer)
std::fprintf(stderr, "CreateWaitableTimer() failed, falling back to Sleep()\n"); std::fprintf(stderr, "CreateWaitableTimer() failed, falling back to Sleep()\n");
}
return s_sleep_timer; return s_sleep_timer;
} }
@ -89,8 +93,19 @@ void Timer::SleepUntil(Value value, bool exact)
{ {
if (exact) if (exact)
{ {
while (GetCurrentValue() < value) for (;;)
{
Value current = GetCurrentValue();
if (current >= value)
break;
// spin for the last 1ms
if ((value - current) > ConvertMillisecondsToValue(1))
{
SleepUntil(value, false); SleepUntil(value, false);
continue;
}
}
} }
else else
{ {