OSGTime.inl

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 *                                License                                    *
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 * This library is free software; you can redistribute it and/or modify it   *
 * under the terms of the GNU Library General Public License as published    *
 * by the Free Software Foundation, version 2.                               *
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#ifdef WIN32
  #include <mmsystem.h>
#else
  #include <sys/types.h>
  #include <sys/time.h>
#endif

OSG_BEGIN_NAMESPACE

inline
Time getSystemTime (void)
{
    Time time;

#ifdef WIN32
    time = Time(timeGetTime()) / 1000.0;
#else
    struct timeval tv;
    gettimeofday(&tv, 0);
    time = Time(tv.tv_usec) / 1000000.0 + Time(tv.tv_sec);
#endif

    return time;
}


inline
TimeStamp getTimeStamp(void)
{
#ifdef WIN32
    Int64 iCounter;
    
    QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER *>(&iCounter));

    return  static_cast<TimeStamp>(iCounter);
#elif defined(__linux) && defined(__i386)

    register uint64_t result;
    //asm volatile ("rdtsc" : "=A"(result));
    asm volatile (".byte 0x0f, 0x31" : "=A" (result)); // same thing as rdtsc... inject the bytes for the opcode.
    return static_cast<TimeStamp>(result);
    
#else
    return static_cast<TimeStamp>(getSystemTime() * 1000.f);
#endif
}


inline
TimeStamp getTimeStampFreq(void)
{
#ifdef WIN32
    Int64 iCounterFreq;
    
    QueryPerformanceFrequency(
        reinterpret_cast<LARGE_INTEGER *>(&iCounterFreq));

    return static_cast<TimeStamp>(iCounterFreq);
    
#elif defined(__linux) && defined(__i386)

    static Int64 iCounterFreq = 0;
    
    if(iCounterFreq == 0)
    {
        // Calibrate against gettimeofday

        Time start, end;
        Int64 cstart, cend;

        cstart = getTimeStamp();
        start = getSystemTime();

        osgsleep(200);

        cend = getTimeStamp();
        end = getSystemTime();

        iCounterFreq = static_cast<Int64>((cend - cstart) / (end - start));    
    }
    return static_cast<TimeStamp>(iCounterFreq);
    
#else
    return static_cast<TimeStamp>(1000000);
#endif
}

inline
Real64 getTimeStampMsecs(TimeStamp ticks)
{
    return ticks * 1000. / getTimeStampFreq();
}

OSG_END_NAMESPACE

#define OSGTIME_INLINE_CVSID "@(#)$Id: $"

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