/*
 * timer.cpp
 *
 *  Created on: Jul 18, 2009
 *      Author: gregor
 */

#include "GLTB/timer.h"

#ifndef WIN32 // Linux implementation

#include <sys/time.h>

namespace gltb {
	void Timer::start()
	{
		gettimeofday(&startTime, 0);
	}

	long long Timer::stop()
	{
		struct timeval tv;
		gettimeofday(&tv, 0);
		long long endTime = tv.tv_sec * 1000 + tv.tv_usec / 1000;

		long long startTimeMS = startTime.tv_sec * 1000 + startTime.tv_usec / 1000;
		return endTime - startTimeMS;
	}

	double Timer::stopHighRes()
	{
		struct timeval tv;
		gettimeofday(&tv, 0);
		double endTime = tv.tv_sec * 1000 + tv.tv_usec / 1000.0;

		double  startTimeMS = startTime.tv_sec * 1000 + startTime.tv_usec / 1000.0;
		return endTime - startTimeMS;
	}
}
#else // Win32 implementation

#include "windows.h"

namespace gltb {
	void Timer::start()
	{
		LARGE_INTEGER temp;
		QueryPerformanceCounter(&temp);
		startTime=temp.QuadPart;
	}

	long long Timer::stop()
	{
		LARGE_INTEGER temp;
		QueryPerformanceCounter(&temp);
		long long endTime=temp.QuadPart;
		QueryPerformanceFrequency(&temp);
		return (long long)(1000*((endTime-startTime)/((double)temp.QuadPart)));
	}

	double Timer::stopHighRes()
	{
		LARGE_INTEGER temp;
		QueryPerformanceCounter(&temp);
		long long endTime = temp.QuadPart;
		QueryPerformanceFrequency(&temp);
		return 1000.0 * ((endTime - startTime) / (double)temp.QuadPart);
	}
}
#endif