lucent/cocco-ddraw
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use waitable timers for better precision (limit game ticks / flip wait)

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This commit is contained in:
FunkyFr3sh 2018-11-29 17:45:10 +01:00
parent 093486ec7f
commit 435854456b
5 changed files with 104 additions and 28 deletions
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56
src/main.c
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@ -160,20 +160,40 @@ BOOL detect_cutscene()
void LimitGameTicks()
{
static DWORD nextGameTick;
if (!nextGameTick)
if (ddraw->ticksLimiter.hTimer)
{
nextGameTick = timeGetTime();
return;
}
nextGameTick += ddraw->ticklength;
DWORD tickCount = timeGetTime();
FILETIME ft;
GetSystemTimeAsFileTime(&ft);
int sleepTime = nextGameTick - tickCount;
if (sleepTime <= 0 || sleepTime > ddraw->ticklength)
nextGameTick = tickCount;
if (CompareFileTime((FILETIME *)&ddraw->ticksLimiter.dueTime, &ft) == -1)
{
memcpy(&ddraw->ticksLimiter.dueTime, &ft, sizeof(LARGE_INTEGER));
}
else
{
WaitForSingleObject(ddraw->ticksLimiter.hTimer, ddraw->ticksLimiter.ticklength * 2);
}
ddraw->ticksLimiter.dueTime.QuadPart += ddraw->ticksLimiter.tickLengthNs;
SetWaitableTimer(ddraw->ticksLimiter.hTimer, &ddraw->ticksLimiter.dueTime, 0, NULL, NULL, FALSE);
}
else
Sleep(sleepTime);
{
static DWORD nextGameTick;
if (!nextGameTick)
{
nextGameTick = timeGetTime();
return;
}
nextGameTick += ddraw->ticksLimiter.ticklength;
DWORD tickCount = timeGetTime();
int sleepTime = nextGameTick - tickCount;
if (sleepTime <= 0 || sleepTime > ddraw->ticksLimiter.ticklength)
nextGameTick = tickCount;
else
Sleep(sleepTime);
}
}
HRESULT __stdcall ddraw_Compact(IDirectDrawImpl *This)
@ -1465,6 +1485,20 @@ ULONG __stdcall ddraw_Release(IDirectDrawImpl *This)
ddraw->render.ev = NULL;
}
if (This->ticksLimiter.hTimer)
{
CancelWaitableTimer(This->ticksLimiter.hTimer);
CloseHandle(This->ticksLimiter.hTimer);
This->ticksLimiter.hTimer = NULL;
}
if (This->flipLimiter.hTimer)
{
CancelWaitableTimer(This->flipLimiter.hTimer);
CloseHandle(This->flipLimiter.hTimer);
This->flipLimiter.hTimer = NULL;
}
DeleteCriticalSection(&This->cs);
/* restore old wndproc, subsequent ddraw creation will otherwise fail */