#include "timer.h"

Timer::Timer()
{
	mCurrentThread = GetCurrentThread();
	DWORD_PTR systemAffinityMask;
	GetProcessAffinityMask(GetCurrentProcess(), &mProcessAffinityMask, &systemAffinityMask);
	
	SetThreadAffinityMask(mCurrentThread, 1);
	QueryPerformanceFrequency(&mCPUFrequency);
	SetThreadAffinityMask(mCurrentThread, mProcessAffinityMask);
}

void Timer::Start()
{
	SetThreadAffinityMask(mCurrentThread, 1);
	QueryPerformanceCounter(&mStart);
	SetThreadAffinityMask(mCurrentThread, mProcessAffinityMask);
}

int Timer::GetPassedTickers()
{
	SetThreadAffinityMask(mCurrentThread, 1);
	QueryPerformanceCounter(&mEnd);
	SetThreadAffinityMask(mCurrentThread, mProcessAffinityMask);
	return (int)(mEnd.QuadPart - mStart.QuadPart);
}

float Timer::GetPassedTime()
{
	return (float)GetPassedTickers() / (float)mCPUFrequency.QuadPart;
}