Timer.h

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/*
* True Reality Open Source Game and Simulation Engine
* Copyright © 2021 Acid Rain Studios LLC
*
* 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 3.0 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
*
* @author Maxim Serebrennik
*/
#pragma once

#include <trUtil/Export.h>

#include <trUtil/PlatformMacros.h>

#include <osg/Timer>

namespace trUtil
{

#if defined(TR_WIN)

    using TimeTicks = unsigned __int64;
#else

    using TimeTicks = unsigned long long;
#endif

    void TR_UTIL_EXPORT AppSleep(unsigned int milliseconds);

    class TR_UTIL_EXPORT Timer
    {
    public:

        Timer();

        ~Timer();

        static const Timer* Instance();

        TimeTicks Tick()
        {
            mOldTicks = mNewTicks;
            mNewTicks = (mTimer.tick() + mCustomTicks);
            return mNewTicks;
        }

        void SetStartTick() { mTimer.setStartTick(); }

        void SetStartTick(TimeTicks t);

        TimeTicks GetStartTick() const { return mTimer.getStartTick(); }

        double DeltaSec(TimeTicks t1, TimeTicks t2) const { return mTimer.delta_s(t1, t2); }

        double DeltaMil(TimeTicks t1, TimeTicks t2) const { return mTimer.delta_m(t1, t2); }

        double DeltaMicro(TimeTicks t1, TimeTicks t2) const { return mTimer.delta_u(t1, t2); }

        double DeltaNano(TimeTicks t1, TimeTicks t2) const { return mTimer.delta_n(t1, t2); }

        double ElapsedSeconds() const { return mTimer.time_s(); }

        double ElapsedMilliseconds() const { return mTimer.time_m(); }

        double ElapsedMicroseconds() const { return mTimer.time_u(); }

        double ElapsedNanoseconds() const { return mTimer.time_n(); }

        double GetSecondsPerCPUTick() const { return mTimer.getSecondsPerTick(); }

        double GetSecondsPerTick() const { return (double)(mNewTicks - mOldTicks)*GetSecondsPerCPUTick(); }

    private:
        osg::Timer mTimer;
        TimeTicks mOldTicks = 0;
        TimeTicks mNewTicks = 0;
        TimeTicks mCustomTicks = 0;
    };
}