lunarium_OLD/src/utils/HighResTimer.cpp

/******************************************************************************
* Filename:  		HighResTimer.cpp
* Date:      		12/06/2010
* Mod. Date: 		03/21/2018
* Author:    		Joseph R. Pollack
* Purpose:   		A high resolution timer suitable for profiling code. This new
*					version	has stripped out the game specific functionality and
*					does not include windows.h in the header.
******************************************************************************/

#include "HighResTimer.h"

#define WIN32_LEAN_AND_MEAN
#include <Windows.h>

namespace Lunarium
{

	HighResTimer::HighResTimer()
	{
		Initialize();
	}



	void HighResTimer::Initialize()
	{
		mStartTime = 0;
		LARGE_INTEGER tickFreq;
		QueryPerformanceFrequency(&tickFreq);
		mTickFrequency = tickFreq.QuadPart;
	}

	// Starts or re-starts the timer.
	void HighResTimer::Reset()
	{
		LARGE_INTEGER tickStart;
		QueryPerformanceCounter(&tickStart);
		mStartTime = tickStart.QuadPart;
	}


	// Returns the amount of time in microseconds since the last Reset() call.
	int64_t HighResTimer::GetElapsedTime()
	{
		LARGE_INTEGER ticks;
		QueryPerformanceCounter(&ticks);
		int64_t elapsedMicro = ticks.QuadPart - mStartTime;

		elapsedMicro *= mcMils;
		elapsedMicro /= mTickFrequency;

		return elapsedMicro;
	}


	double HighResTimer::GetElapsedSeconds()
	{
		int64_t emicro = GetElapsedTime();
		double dmicro = ((double)emicro);
		double dmcMils = ((double)mcMils);
		double seconds = dmicro / dmcMils;
		return seconds;
	}
}