109 lines
2.1 KiB
C++
109 lines
2.1 KiB
C++
//===== Copyright ?1996-2005, Valve Corporation, All rights reserved. ======//
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//
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// Purpose:
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//
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//===========================================================================//
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#include "stdafx.h"
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#include "perf_counter.h"
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#ifdef _WIN32
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#include <windows.h>
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void CPerformanceCounter::InitializePerformanceCounter(void)
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{
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LARGE_INTEGER PerformanceFreq;
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unsigned int lowpart, highpart;
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QueryPerformanceFrequency(&PerformanceFreq);
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lowpart = (unsigned int)PerformanceFreq.LowPart;
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highpart = (unsigned int)PerformanceFreq.HighPart;
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m_iLowShift = 0;
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while (highpart || (lowpart > 2000000.0))
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{
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m_iLowShift++;
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lowpart >>= 1;
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lowpart |= (highpart & 1) << 31;
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highpart >>= 1;
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}
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m_flPerfCounterFreq = 1.0 / (double)lowpart;
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}
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float CPerformanceCounter::GetCurTime(void)
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{
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static int sametimecount;
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static unsigned int oldtime;
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static int first = 1;
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LARGE_INTEGER PerformanceCount;
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unsigned int temp, t2;
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double time;
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QueryPerformanceCounter(&PerformanceCount);
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temp = ((unsigned int)PerformanceCount.LowPart >> m_iLowShift) | ((unsigned int)PerformanceCount.HighPart << (32 - m_iLowShift));
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if (first)
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{
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oldtime = temp;
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first = 0;
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}
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else
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{
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if ((temp <= oldtime) && ((oldtime - temp) < 0x10000000))
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{
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oldtime = temp;
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}
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else
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{
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t2 = temp - oldtime;
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time = (double)t2 * m_flPerfCounterFreq;
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oldtime = temp;
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m_flCurrentTime += time;
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if (m_flCurrentTime == m_flLastCurrentTime)
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{
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sametimecount++;
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if (sametimecount > 100000)
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{
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m_flCurrentTime += 1.0;
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sametimecount = 0;
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}
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}
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else
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sametimecount = 0;
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m_flLastCurrentTime = m_flCurrentTime;
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}
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}
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return m_flCurrentTime;
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}
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#else
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#include <sys/time.h>
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#include <unistd.h>
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void CPerformanceCounter::InitializePerformanceCounter(void)
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{
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struct timeval tp;
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gettimeofday( &tp, NULL );
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secbase = tp.tv_sec;
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}
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float CPerformanceCounter::GetCurTime(void)
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{
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struct timeval tp;
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gettimeofday( &tp, NULL );
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if ( !secbase )
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{
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secbase = tp.tv_sec;
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return ( tp.tv_usec / 1000000.0 );
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}
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return (( tp.tv_sec - secbase ) + tp.tv_usec / 1000000.0 );
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}
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#endif
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