/home/carolina/workspace/spvolren_cpu/timer.c

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/*
 * Copyright (c) 2005  Institute for Visualization and Interactive
 * Systems, University of Stuttgart, Germany
 *
 * This source code is distributed as part of the single-pass volume
 * rendering project. Details about this project can be found on the
 * project web page at http://www.vis.uni-stuttgart.de/eng/research/
 * fields/current/spvolren. This file may be distributed, modified,
 * and used free of charge as long as this copyright notice is
 * included in its original form. Commercial use is strictly
 * prohibited.
 *
 * Filename: timer.c
 * 
 */

#include <stdio.h>
#if defined WIN32
#include <windows.h>
#else
        #include <sys/time.h>
#endif

#include "timer.h"

#if ! defined WIN32
double timer()
{
    struct timeval t;
    gettimeofday(&t, NULL);
    return (t.tv_sec * 1e6 + t.tv_usec)/1000.0;
}
#else
double timer()
{
        LARGE_INTEGER timerFreq, timerCount;

        if (! QueryPerformanceFrequency(&timerFreq)) {
                fprintf(stderr, "determining timer frequency failed\n");
                exit(1);
        }
        QueryPerformanceCounter(&timerCount);
        
        return (timerCount.QuadPart * 1000.0)/timerFreq.QuadPart;
}
#endif

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