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