source: GTP/trunk/Lib/Vis/Preprocessing/src/Timer/BenchTimer.cpp @ 2015

// ===========================================================================
//  (C) 1999 Vienna University of Technology
// ===========================================================================
//  NAME:       BenchTimer
//  TYPE:       c++ code
//  PROJECT:    Urban Viz/yare (yet another rendering engine)
//  CONTENT:    Very accurate timer for Win32 systems
//                              (uses QueryPerformanceCounter, usually microseconds)
//  VERSION:    0.1
// ===========================================================================
//  AUTHORS:    mw      Michael Wimmer
// ===========================================================================
//  HISTORY:
//
//  15-jul-99 14:00:00  mw      created
// ===========================================================================
//  $Header: /usr/local/cvsyare/cvsyamp/src/yareutils/BenchTimer.cpp,v 1.1 2002/11/14 15:22:58 wimmer Exp $ 
// ===========================================================================

#ifdef WIN32

#include "BenchTimer.h"

#include "merror.h"

// ---------------------------------------------------------------------------
//  class BenchTimer implementation
// ---------------------------------------------------------------------------


LARGE_INTEGER BenchTimer::frequency;
bool BenchTimer::isinitialized = false;
bool BenchTimer::available = false;

// this retrieves the timer frequency - will be called by constructor
void BenchTimer::InitClass(bool verbose)
{
        if (QueryPerformanceFrequency(&frequency))
        {
                available = true;
                if (verbose)
                        //OUT1(SV(double(frequency.QuadPart)));
                        OUT1("QueryPerformanceCounter Frequency: " << double(frequency.QuadPart));
        }
        else
        {
                EOUT("No high resolution perfomance counter installed!");
                available = false;
                frequency.QuadPart = 1;
        }

        isinitialized = true;
}

/// returns the frequency
double BenchTimer::GetFrequency(bool verbose)
{
        if (!isinitialized)
                InitClass(verbose);
        
        return double(frequency.QuadPart);
}

#endif // WIN32