Function Com_Frame

code/qcommon/common.cpp:1352–1553

#endif

void Com_Frame( void ) {
	try
	{
		int		timeBeforeFirstEvents = 0, timeBeforeServer = 0, timeBeforeEvents = 0, timeBeforeClient = 0, timeAfter = 0;
		int		msec, minMsec;
		int		timeVal;
		static int	lastTime = 0, bias = 0;

		// write config file if anything changed
		Com_WriteConfiguration();

		//
		// main event loop
		//
		if ( com_speeds->integer ) {
			timeBeforeFirstEvents = Sys_Milliseconds ();
		}

		// Figure out how much time we have
		if(com_minimized->integer && com_maxfpsMinimized->integer > 0)
			minMsec = 1000 / com_maxfpsMinimized->integer;
		else if(com_unfocused->integer && com_maxfpsUnfocused->integer > 0)
			minMsec = 1000 / com_maxfpsUnfocused->integer;
		else if(com_maxfps->integer > 0)
			minMsec = 1000 / com_maxfps->integer;
		else
			minMsec = 1;

		timeVal = com_frameTime - lastTime;
		bias += timeVal - minMsec;

		if (bias > minMsec)
			bias = minMsec;

		// Adjust minMsec if previous frame took too long to render so
		// that framerate is stable at the requested value.
		minMsec -= bias;

		timeVal = Com_TimeVal(minMsec);
		do {
			// Busy sleep the last millisecond for better timeout precision
			if(com_busyWait->integer || timeVal < 1)
				Sys_Sleep(0);
			else
				Sys_Sleep(timeVal - 1);
		} while( (timeVal = Com_TimeVal(minMsec)) != 0 );
		IN_Frame();

		lastTime = com_frameTime;
		com_frameTime = Com_EventLoop();

		msec = com_frameTime - lastTime;

		Cbuf_Execute ();

		// mess with msec if needed
		float fractionMsec=0.0f;
		msec = Com_ModifyMsec( msec, fractionMsec);