core/kgllib/fpscounter.h

/*
 * Copyright (C) 2008 Rivo Laks <rivolaks@hot.ee>
 *
 * 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef KGLLIB_FPSCOUNTER_H
#define KGLLIB_FPSCOUNTER_H


#include "kgllib.h"

#include <QtCore/QTime>
#include <QtCore/QString>


namespace KGLLib
{

class KGLLIB_EXPORT FPSCounter
{
public:
    FPSCounter();

    void nextFrame();
    void resetTimeElapsed();

    float fps() const  { return mFPS; }
    QString fpsString() const;
    // TODO: rename to timeSinceLastFrame()? change semantics?
    float timeElapsed() { return mTimeElapsed; }
    float totalTimeElapsed()  { return mTotalTimeElapsed; }

protected:
    QTime mTime;
    int mFrames;
    float mFPS;

    float mTimeElapsed;  // in sec
    float mTotalTimeElapsed;  // in sec
    QTime mLastTime;
};

}

#endif