FrameTimer.h

//
// FrameTimer.h
//
// Copyright (c) 2001 Virtual Terrain Project
// Free for all uses, see license.txt for details.
//

#ifndef FRAMETIMER_H
#define FRAMETIMER_H

#ifdef WIN32
#define TLONG __int64
#else
#define TLONG long
#endif

#define AVGLEN  8

class FrameTimer
{
public:
    // initialize the clock.
    TLONG Init();
    // time since Init() in seconds.
    float clockSeconds();

    // update the number of ticks since the last frame update.
    void updateFrameTick();
    // time from the current frame update and the previous one in seconds.
    float frameSeconds() { return (float)frameTick()/(float)_tickRatePerSecond; }
    float frameRate();
    float frameRateAverge() { return m_avg; }

    TLONG _tickRatePerSecond;
    TLONG _initialTick;
    TLONG _lastFrameTick;
    TLONG _frameTick;

    // system tick.
    TLONG clockTick();
    TLONG frameTick();
    TLONG _tick();

    // for keeping an average framerate
    TLONG m_previous[AVGLEN];
    int m_pos;
    float m_avg;
};

#endif