/// <summary>Returns the number of seconds elapsed since the last call to <see cref="Tic"/>.</summary>
public static double Toc()
{
long stop;
WinAPI.QueryPerformanceCounter(out stop);
return((stop - _start) / (double)WinAPI.PerformanceFreq);
}
/// <summary>
/// Starts / resets a simple performance timer. Returns the number of seconds elapsed since the last call to <see
/// cref="Tic"/>, or zero if this is the first call. See also <see cref="Toc"/>.</summary>
public static double Tic()
{
long prevStart = _start;
WinAPI.QueryPerformanceCounter(out _start);
return(prevStart == 0 ? 0 : ((_start - prevStart) / (double)WinAPI.PerformanceFreq));
}
/// <summary>Counts another frame and updates all statistics. Returns the time since the last frame,
/// or null if this is the first counted frame.</summary>
public double?CountFrame()
{
double?result = null;
long count;
WinAPI.QueryPerformanceCounter(out count);
if (_lastCount != 0)
{
while (_frameTimes.Count > 5 && _frameTimes.Count > AverageFps / 2)
{
delFromStats();
}
result = (count - _lastCount) * _secondsPerCount;
addToStats(result.Value);
}
_lastCount = count;
return(result);
}