public PrecisionTimer()
{
//how many ticks per sec do we get
QueryPerformanceWrapper.QueryPerformanceFrequency(out _perfCountFreq);
_timeScale = 1.0 / _perfCountFreq;
}
//only use this after a call to ReadyForNextFrame.
public double TimeElapsed()
{
_lastTimeElapsed = _timeElapsed;
QueryPerformanceWrapper.QueryPerformanceCounter(out _currentTime);
_timeElapsed = (_currentTime - _lastTimeInTimeElapsed) * _timeScale;
_lastTimeInTimeElapsed = _currentTime;
if (_smoothUpdates)
{
if (_timeElapsed < (_lastTimeElapsed * Smoothness))
{
return(_timeElapsed);
}
else
{
return(0.0);
}
}
else
{
return(_timeElapsed);
}
}
public PrecisionTimer(double fps)
{
_normalFPS = fps;
//how many ticks per sec do we get
QueryPerformanceWrapper.QueryPerformanceFrequency(out _perfCountFreq);
_timeScale = 1.0 / _perfCountFreq;
//calculate ticks per frame
_frameTime = (long)(_perfCountFreq / _normalFPS);
}
public void Start()
{
_started = true;
_timeElapsed = 0.0;
//get the time
QueryPerformanceWrapper.QueryPerformanceCounter(out _lastTime);
//keep a record of when the timer was started
_startTime = _lastTimeInTimeElapsed = _lastTime;
//update time to render next frame
_nextTime = _lastTime + _frameTime;
}
public bool ReadyForNextFrame()
{
Debug.Assert(Math.Abs(_normalFPS) > double.MinValue, "PrecisionTimer::ReadyForNextFrame<No FPS set in timer>");
QueryPerformanceWrapper.QueryPerformanceCounter(out _currentTime);
if (_currentTime > _nextTime)
{
_timeElapsed = (_currentTime - _lastTime) * _timeScale;
_lastTime = _currentTime;
//update time to render next frame
_nextTime = _currentTime + _frameTime;
return(true);
}
return(false);
}
