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glt/frame.h

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#ifndef GLT_FRAME_H
#define GLT_FRAME_H

/*

  GLT OpenGL C++ Toolkit      
  Copyright (C) 2000-2002 Nigel Stewart
  Email: nigels.com@gmail.com   WWW: http://www.nigels.com/glt/

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

#include <iosfwd>
#include <vector>
#include <string>

#include <misc/timer.h>
#include <misc/cbuffer.h>

class GltFrameRate
{
public:
    GltFrameRate(const int sampleSize = 11);
    ~GltFrameRate();

    GltFrameRate &operator++();
    
    double elapsedTime() const;
    int   totalFrames() const;

    double frameRate() const;
    double frameTime() const;

    std::string summary() const;

    std::string detailed() const;

private:

    Timer           _timer;             // Timer used for frame rate calculation
    int             _frames;            // Total number of frames
    double          _step;              // Minimum time step between recalculation
    
    double          _lastCalc;          // Time of last recalculation
    double          _lastFrameRate;     // Previously calculated frame rate (frame/sec)
    double          _lastFrameTime;     // Previously calculated frame time (sec/frame)
    
    cbuffer<double> _buffer;            // Circular buffer storage 
};

#endif

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