#include <windows.h>
#include <mmsystem.h>
#include "Timer.h"


Caldron::Base::CTimer& Caldron::Base::CTimer::_GetInstance()
{
	static CTimer Instance; 
	return Instance; 
}


Caldron::Base::CTimer::~CTimer()
{
	
}


void Caldron::Base::CTimer::Init( int keep )
{
	if( !QueryPerformanceFrequency( &m_QPFTicksPerSec ) ) 
		MessageBox( NULL, "ŸÀ̸ӽýºÅÛÀ»Áö¿øÇÒ¼ö¾ø½À´Ï´Ù.", "¿¡·¯", MB_OK ); 
	
	QueryPerformanceCounter( &m_StartTime ); 
	
	m_fFps = 0; 
	m_fElapsedTime = 0; 
	m_iKeepFrame = keep; 
}


void Caldron::Base::CTimer::Update()
{
	static LARGE_INTEGER CurTime; 
	static LARGE_INTEGER LastTime = m_StartTime;
	
	QueryPerformanceCounter( &CurTime ); 

	m_fElapsedTime = (float)(((double)CurTime.QuadPart - (double)LastTime.QuadPart) / (double)m_QPFTicksPerSec.QuadPart);
	m_fFps = (float)((double)m_QPFTicksPerSec.QuadPart / ((double)CurTime.QuadPart - (double)LastTime.QuadPart));  
	m_fAppTime = (float)(((double)CurTime.QuadPart - (double)m_StartTime.QuadPart) / (double)m_QPFTicksPerSec.QuadPart); 

	if( m_iKeepFrame > 0 )
	{
		while( m_fFps > (float)m_iKeepFrame )
		{
			m_fFps = (float)((double)m_QPFTicksPerSec.QuadPart / ((double)CurTime.QuadPart - (double)LastTime.QuadPart));
			QueryPerformanceCounter( &CurTime ); 
		}
	}

	LastTime = CurTime; 
}