#include "Timer.h"
#include <Windows.h>

//#define TIMER_TGT

namespace LifeCore
{
	Timer::Timer()
		:timeElapsed(0)
	{
#ifdef TIMER_TGT
		if(refCount == 0)
			timeBeginPeriod(1);
		refCount++;
#else
		QueryPerformanceFrequency((LARGE_INTEGER *)&perfFreq);
#endif
	}
	Timer::~Timer()
	{
#ifdef TIMER_TGT
		refCount--;
		if(refCount == 0)
			timeEndPeriod(1);
#endif
	}
	void Timer::Start()
	{
#ifdef TIMER_TGT
		lastTime = timeGetTime();
#else
		DWORD_PTR old_mask = SetThreadAffinityMask(GetCurrentThread(), 0);
		QueryPerformanceCounter((LARGE_INTEGER *)&lastTime);
		SetThreadAffinityMask(GetCurrentThread(), old_mask);
#endif
	}
	void Timer::Stop()
	{
#ifdef TIMER_TGT
		curTime = timeGetTime();
		diff = curTime - lastTime;
		timeElapsed = 1.0 / (double)diff; //time in SECONDS
#else
		DWORD_PTR old_mask = SetThreadAffinityMask(GetCurrentThread(), 0);
		QueryPerformanceCounter((LARGE_INTEGER *)&curTime);
		SetThreadAffinityMask(GetCurrentThread(), old_mask);
		if(lastTime == 0)
			timeElapsed = 0;
		else
		{
			timeElapsed = (float)((double)(curTime - lastTime) / (double)perfFreq);
		}

#endif
	}
	float Timer::getTimeElapsed()
	{
		return timeElapsed;
	}
}