//On InitQueryPerformanceFrequency(&m_liFreq);//In the render loop		QueryPerformanceCounter(liStart_us);		m_fFrameRate_Hz = CalcFrameRate(*liStart_us, &m_fElapsed_sec);sprintf(szRate, "FPS: %.3f", m_fFrameRate_Hz);SetWindowText(hWndFrameRateTextBox, szRate);float CGameEngine::CalcFrameRate(LARGE_INTEGER liNow_us, float* pfElapsed_sec)	{	//Original framerate calculation had really crappy twiddle	//framerate = 1000.0f / (float)elapsed;	const float e = 2.718281828f;	//0.25Hz filter, time in ms, so /1000.0	static float filter = (float)pow(e, -2.0f * 0.5); 		//guess at initial framerate, so it doesn't lag so bad on init	static float fFrameRate_fps = 33.3f;	//float fElapsed_ms = (liNow_us.QuadPart - liTimeSnap_us.QuadPart) / 1000.0f;  //convert us to ms	float fElapsed_sec = float(liNow_us.QuadPart - m_liTimeSnap_us.QuadPart) / float(m_liFreq.QuadPart);	m_liTimeSnap_us = liNow_us;		float factor = (float)pow(filter, fElapsed_sec);	float ifactor = 1.0f - factor;		if(fElapsed_sec<=0.0f)		//if the elasped time is 0, it took less than 5us to render the frame!		fFrameRate_fps = 200000.0f;	else		//filter, *1000.0f to convert ms to sec (again)		fFrameRate_fps = fFrameRate_fps * factor + ifactor / fElapsed_sec;		if(pfElapsed_sec)		*pfElapsed_sec = fElapsed_sec;		return(fFrameRate_fps);	}