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()
{
}

double plTimerShare::GetSeconds() const
{
    hsWide  ticks;
    return hsTimer::GetRawTicks(&ticks)->AsDouble() / hsTimer::GetRawBase().AsDouble();
}

double plTimerShare::GetMilliSeconds() const
{
    return GetSeconds() * 1.e3;
}

hsWide plTimerShare::DSecondsToRawTicks(double secs)
{
    hsWide retVal;
    double ticks = secs * hsTimer::GetRawBase().AsDouble();
    double hi = ticks / double(65536) / double(65536);
    ticks -= hi;
    retVal.fHi = int32_t(hi);
    retVal.fLo = int32_t(ticks);
    return retVal;
}

double plTimerShare::RawTicksToDSeconds(const hsWide& ticks)
{
    return ticks.AsDouble() / hsTimer::GetRawBase().AsDouble();
}


inline hsWide* plTimerShare::FactorInTimeZero(hsWide* ticks) const
{
    if( fFirstTime )
    {   
        fFirstTime = false;
        fRawTimeZero = *ticks;
        ticks->Set(0, 0);
    }
    else
    {
        ticks->Sub(&fRawTimeZero);
    }
    return ticks;
}

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(hsBool realTime)
{ 
    fRunningFrameTime = !realTime; 
    if( realTime )
    {
        fRealSeconds = GetSeconds();
    }
}

#if HS_BUILD_FOR_WIN32

hsWide* plTimerShare::GetRawTicks(hsWide* ticks) const
{
    LARGE_INTEGER   large;

    if (::QueryPerformanceCounter(&large))
    {           
        ticks->Set(large.HighPart, large.LowPart);
    }
    else
    {
        ticks->Set(0, ::GetTickCount());
    }

    return FactorInTimeZero(ticks);
}

hsWide hsTimer::IInitRawBase()
{
    hsWide base;
    LARGE_INTEGER   large;
    if (::QueryPerformanceFrequency(&large))
        base.Set(large.HighPart, large.LowPart);
    else
        base.Set(0, 1000);

    return base;
}

#elif HS_BUILD_FOR_UNIX

#include <sys/time.h>

#define kMicroSecondsUnit   1000000
static uint32_t   gBaseTime = 0;

hsWide* plTimerShare::GetRawTicks(hsWide* ticks) const
{
    timeval tv;

    (void)::gettimeofday(&tv, nil);
    if (gBaseTime == 0)
        gBaseTime = tv.tv_sec;

    ticks->Mul(tv.tv_sec - gBaseTime, kMicroSecondsUnit)->Add(tv.tv_usec);
    return ticks;
}

hsWide hsTimer::IInitRawBase()
{
    hsWide base;
    base.Set(0, kMicroSecondsUnit);
    return base;
}

#endif

// 
// hsTimer - thin static interface to plTimerShare. Also keeps a couple of
//      constants.
//
static plTimerShare         staticTimer;
plTimerShare*               hsTimer::fTimer = &staticTimer; // until overridden.
const double                hsTimer::fPrecTicksPerSec = hsTimer::GetPrecTicksPerSec();
const hsWide                hsTimer::fRawBase = hsTimer::IInitRawBase();

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

///////////////////////////
// Precision timer routines
// These remain as statics 
// since they are stateless 
// anyway.
///////////////////////////

double hsTimer::GetPrecTicksPerSec()
{
#if HS_BUILD_FOR_WIN32
    LARGE_INTEGER freq;
    if( !QueryPerformanceFrequency(&freq) )
    {
        return 1000.f;
    }
    return ((double) freq.LowPart);
#endif
    
    return 1;
}

uint32_t hsTimer::GetPrecTickCount()
{
#if HS_BUILD_FOR_WIN32
    LARGE_INTEGER ti;
    if( !QueryPerformanceCounter(&ti) )
        return GetTickCount();

    return ti.LowPart;
#else
    return 1;
#endif
}
uint32_t hsTimer::PrecSecsToTicks(float secs)
{
    return (uint32_t)(((double)secs) * fPrecTicksPerSec);
}
double hsTimer::PrecTicksToSecs(uint32_t ticks)
{
    return ((double)ticks) / fPrecTicksPerSec;
}
double hsTimer::PrecTicksToHz(uint32_t ticks)
{
    return fPrecTicksPerSec / ((double)ticks);
}

uint64_t hsTimer::GetFullTickCount()
{
#if HS_BUILD_FOR_WIN32
    LARGE_INTEGER ticks;
    QueryPerformanceCounter(&ticks);
    return ticks.QuadPart;
#else
    return 0;
#endif
}

float hsTimer::FullTicksToMs(uint64_t ticks)
{
#ifdef HS_BUILD_FOR_WIN32
    static uint64_t ticksPerTenthMs = 0;

    if (ticksPerTenthMs == 0)
    {
        LARGE_INTEGER perfFreq;
        QueryPerformanceFrequency(&perfFreq);
        ticksPerTenthMs = perfFreq.QuadPart / 10000;
    }

    return float(ticks / ticksPerTenthMs) / 10.f;
#else
    return 0.f;
#endif
}