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// StopWatch.h
// Stopwatch class for high resolution timing.
// Code by Richard S. Wright Jr.
// March 23, 1999
//
// This function uses the High performance counter on Win32 and
// gettimeofday on Mac OS X/Linux. gettimeofday is actually pretty
// good on the Mac (about 10ms).
#ifndef STOPWATCH_HEADER
#define STOPWATCH_HEADER
#ifdef WIN32
#include <windows.h>
#else
#include <sys/time.h>
#endif
///////////////////////////////////////////////////////////////////////////////
// Simple Stopwatch class. Use this for high resolution timing
// purposes (or, even low resolution timings)
// Pretty self-explanitory....
// Reset(), or GetElapsedSeconds().
class CStopWatch
{
public:
CStopWatch(void)
{
#ifdef WIN32
QueryPerformanceFrequency(&m_CounterFrequency);
QueryPerformanceCounter(&m_LastCount);
#else
gettimeofday(&m_LastCount, 0);
#endif
}
// Resets timer (difference) to zero
inline void Reset(void)
{
#ifdef WIN32
QueryPerformanceCounter(&m_LastCount);
#else
gettimeofday(&m_LastCount, 0);
#endif
}
// Get elapsed time in seconds
float GetElapsedSeconds(void)
{
// Get the current count
#ifdef WIN32
LARGE_INTEGER lCurrent;
QueryPerformanceCounter(&lCurrent);
return float((lCurrent.QuadPart - m_LastCount.QuadPart) /
double(m_CounterFrequency.QuadPart));
#else
timeval lcurrent;
gettimeofday(&lcurrent, 0);
float fSeconds = (float)(lcurrent.tv_sec - m_LastCount.tv_sec);
float fFraction = (float)(lcurrent.tv_usec - m_LastCount.tv_usec) * 0.000001f;
return fSeconds + fFraction;
#endif
}
protected:
#ifdef WIN32
LARGE_INTEGER m_CounterFrequency;
LARGE_INTEGER m_LastCount;
#else
timeval m_LastCount;
#endif
};
#endif
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