OpenSceneGraph/include/osg/Timer

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//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.
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#ifndef OSG_TIMER
#define OSG_TIMER 1
#include <osg/Export>
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#if defined(WIN32 ) && !(defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MWERKS__))
namespace osg {
typedef __int64 Timer_t;
}
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#elif defined(__linux) || defined(__FreeBSD__) || defined(__CYGWIN__)|| defined(__MINGW32__)
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namespace osg {
typedef unsigned long long Timer_t;
}
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#elif defined(__sgi)
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namespace osg {
typedef unsigned long long Timer_t;
}
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#elif defined(unix)
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namespace osg {
typedef unsigned long long Timer_t;
}
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#elif defined __APPLE__ || defined macintosh
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namespace osg {
typedef double Timer_t;
}
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#else
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#include <ctime>
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namespace osg {
typedef std::clock_t Timer_t;
}
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#endif
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namespace osg {
/** A high resolution, low latency time stamper.*/
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class SG_EXPORT Timer {
public:
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Timer();
~Timer() {}
#if defined __DARWIN_OSX__ || defined macintosh
// PJA MAC OSX - inline Tick() pollutes namespace so badly
// we cant compile, due to Carbon.h ...
Timer_t tick() const;
#else
inline Timer_t tick() const;
#endif
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inline double delta_s( Timer_t t1, Timer_t t2 ) const { return (double)(t2 - t1)*_secsPerClick; }
inline double delta_m( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e3; }
inline double delta_u( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e6; }
inline double delta_n( Timer_t t1, Timer_t t2 ) const { return delta_s(t1,t2)*1e9; }
private :
double _secsPerClick;
bool _useStandardClock;
#ifdef __sgi
unsigned long* _clockAddress;
int _cycleCntrSize;
static unsigned long _dummy;
#endif
};
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}
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#if defined(_WIN32) && !(defined(__CYGWIN__) || defined(__MINGW32__) || defined(__MWERKS__))
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#include <time.h>
#pragma optimize("",off)
namespace osg{
inline Timer_t Timer::tick( void ) const
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{
if (_useStandardClock) return clock();
volatile Timer_t ts;
volatile unsigned int HighPart;
volatile unsigned int LowPart;
_asm
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{
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xor eax, eax // Used when QueryPerformanceCounter()
xor edx, edx // not supported or minimal overhead
_emit 0x0f // desired
_emit 0x31 //
mov HighPart,edx
mov LowPart,eax
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}
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//ts = LowPart | HighPart >> 32;
*((unsigned int*)&ts) = LowPart;
*((unsigned int*)&ts+1) = HighPart;
return ts;
}
}
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#pragma optimize("",on)
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#elif defined(__MINGW32__)
#include <sys/time.h>
#define CLK(x) __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x))
namespace osg{
inline Timer_t Timer::tick() const
{
if (_useStandardClock)
return clock();
else
{
Timer_t x;CLK(x);return x;
}
}
}
#elif defined(__linux) || defined(__FreeBSD__) || defined(__CYGWIN__)
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#include <sys/time.h>
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#define CLK(x) __asm__ volatile (".byte 0x0f, 0x31" : "=A" (x))
namespace osg{
inline Timer_t Timer::tick() const
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{
if (_useStandardClock)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return ((osg::Timer_t)tv.tv_sec)*1000000+(osg::Timer_t)tv.tv_usec;
}
else
{
Timer_t x;CLK(x);return x;
}
}
}
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#elif defined(__sgi)
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#include <sys/time.h>
namespace osg{
inline Timer_t Timer::tick() const
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{
if (_useStandardClock)
{
struct timeval tv;
gettimeofday(&tv, NULL);
return ((osg::Timer_t)tv.tv_sec)*1000000+(osg::Timer_t)tv.tv_usec;
}
else
{
return *_clockAddress;
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}
}
}
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#elif defined(unix)
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#include <sys/time.h>
namespace osg{
inline Timer_t Timer::tick() const
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{
struct timeval tv;
gettimeofday(&tv, NULL);
return ((osg::Timer_t)tv.tv_sec)*1000000+(osg::Timer_t)tv.tv_usec;
}
}
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#elif !defined (__DARWIN_OSX__) && !defined (macintosh)
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// no choice, always use std::clock()
namespace osg{
inline Timer_t Timer::tick( void ) const { return std::clock(); }
}
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#endif
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// note, MacOSX compiled in the Timer.cpp.
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#endif