Method Process

BeefySysLib/BFApp.cpp:115–268

//#define PERIODIC_PERF_TIMING

void BFApp::Process()
{
    //Beefy::DebugTimeGuard suspendTimeGuard(30, "BFApp::Process");
    
	RenderWindow* headRenderWindow = NULL;

 	float physRefreshRate = 0;
	if ((mRenderDevice != NULL) && (!mRenderDevice->mRenderWindowList.IsEmpty()))
	{
		headRenderWindow = mRenderDevice->mRenderWindowList[0];
		physRefreshRate = headRenderWindow->GetRefreshRate();
	}

	if (physRefreshRate <= 0)
		physRefreshRate = 60.0f;

	float ticksPerFrame = 1;
	float physTicksPerFrame = 1000.0f / physRefreshRate;

	if (mInProcess)
		return; // No reentry
	mInProcess = true;
	
	uint32 tickNow = BFTickCount();
	const int vSyncTestingPeriod = 250;
		
	bool didVBlankWait = false;
		
	if (mVSyncActive)
	{		
		// Have a time limit in the cases we miss the vblank
		if (mVSyncEvent.WaitFor((int)(physTicksPerFrame + 1)))
			didVBlankWait = true;
	}

	if (mRefreshRate > 0)
		ticksPerFrame = 1000.0f / mRefreshRate;
	int ticksSinceLastProcess = tickNow - mLastProcessTick;

    mUpdateSampleCount++;
    mUpdateSampleTimes += ticksSinceLastProcess;
    //TODO: Turn off mVSynched based on error calculations - (?)

	// Two VSync failures in a row means we set mVSyncFailed and permanently disable it
	if (mUpdateSampleTimes >= vSyncTestingPeriod)
	{
		int expectedFrames = (int)(mUpdateSampleTimes / ticksPerFrame);
		if (mUpdateSampleCount > expectedFrames * 1.5)			
		{
			if (!mVSynched)
				mVSyncFailed = true;				
			mVSynched = false;
		}
		else
		{
			if (!mVSyncFailed)
				mVSynched = true;
		}