CWE-ou-minkata/Sources/Plasma/NucleusLib/pnTimer/hsTimer.cpp

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*==LICENSE==*/
#include "hsTimer.h"
#include "HeadSpin.h"

#include "plTweak.h"

//
// plTimerShare - the actual worker. All process spaces should share a single
//      plTimerShare to keep time synchronized across spaces.
//
plTimerShare::plTimerShare()
:   fFirstTime(true),
    fSysSeconds(0),
    fRealSeconds(0),
    fDelSysSeconds(0),
    fFrameTimeInc(0.03f),
    fSysTimeScale(1.f),
    fTimeClampSecs(0.1f),
    fSmoothingClampSecs(-1.0f),
    fRunningFrameTime(false),
    fClamping(false),
    fResetSmooth(true),
    fCurrSlot(0)
{
}

plTimerShare::~plTimerShare()
{
}

uint64_t plTimerShare::GetTicks() const
{
    plTimerShare::Duration d = plTimerShare::Clock::now().time_since_epoch();
    typedef std::chrono::duration<uint64_t, plTimerShare::Clock::period> ticks;

    return std::chrono::duration_cast<ticks>(d).count();
}

double plTimerShare::IncSysSeconds()
{
    if( fRunningFrameTime )
    {
        fDelSysSeconds = fFrameTimeInc * fSysTimeScale;
        fSysSeconds += fDelSysSeconds;

        fResetSmooth = true;
    }
    else if( fSmoothingClampSecs >= 0 )
    {
        double t = GetSeconds();
        float delSys = float(t - fRealSeconds);
        fClamping = ( (fTimeClampSecs > 0) && (delSys > fTimeClampSecs) );
        if (fClamping)
        {
            delSys = fTimeClampSecs;
        }
        delSys *= fSysTimeScale;
        if( fDelSysSeconds > 0 && fDelSysSeconds < fSmoothingClampSecs )
        {
            const float kFrac = 0.1f;
            const float kOneMinusFrac = 1.f-kFrac;
            delSys *= kFrac;
            delSys += fDelSysSeconds * kOneMinusFrac;
        }
        if (delSys > 4.0f && delSys < 5.0f)
        {
            //got that mysterious bug, (Win2k? certain CPU's?) try again...
#if HS_BUILD_FOR_WIN32
            int count = 10;
            while( delSys >= fDelSysSeconds * 2 && count > 0 )
            {
                fRealSeconds = t;
                t = GetSeconds();
                delSys = float(t - fRealSeconds);
                count--;
            }
#endif
        }
        fDelSysSeconds = delSys;
        fSysSeconds += fDelSysSeconds;
        fRealSeconds = t;

        fResetSmooth = true;
    }
    else
    {
        double t = GetSeconds();
        plCONST(int) kSmoothBuffUsed(kSmoothBuffLen);

        if( fResetSmooth )
        {
            int i;
            for( i = 0; i < kSmoothBuffUsed; i++ )
                fSmoothBuff[i] = t;
            fResetSmooth = false;
        }

        if( ++fCurrSlot >= kSmoothBuffUsed )
            fCurrSlot = 0;
        fSmoothBuff[fCurrSlot] = t;

        double avg = 0;
        int j;
        for( j = 0; j < kSmoothBuffUsed; j++ )
        {
            avg += fSmoothBuff[j];
        }
        avg /= double(kSmoothBuffUsed);

        plCONST(float) kMaxSmoothable(0.15f);
        fDelSysSeconds = float(avg - fRealSeconds) * fSysTimeScale;
        if( fDelSysSeconds > kMaxSmoothable * fSysTimeScale )
        {
            avg = t;
            fDelSysSeconds = float(avg - fRealSeconds) * fSysTimeScale;
            fResetSmooth = true;
        }
        fSysSeconds += fDelSysSeconds;
        fRealSeconds = avg;
    }
    return fSysSeconds;
}

void plTimerShare::SetRealTime(bool realTime)
{
    fRunningFrameTime = !realTime;
    if (realTime)
    {
        fRealSeconds = GetSeconds();
    }
}


plTimerShare::Duration plTimerShare::GetRawTicks() const
{
    plTimerShare::TimePoint tp = Clock::now();

    if (fFirstTime)
    {
        fFirstTime = false;
        fRawTimeZero = tp;
        return plTimerShare::Duration(0);
    }
    else
    {
        return plTimerShare::Duration(tp - fRawTimeZero);
    }
}


//
// hsTimer - thin static interface to plTimerShare.
//
static plTimerShare staticTimer;
plTimerShare*       hsTimer::fTimer = &staticTimer; // until overridden.

void hsTimer::SetTheTimer(plTimerShare* timer)
{
    fTimer = timer;
}