FrameTimer::FrameTimer()
{
	m_dwTotalFrames = 0L;

	m_ulStartTime = 0;
	m_ulTime = 0;
	m_ulLastTime = 0;
}

FrameTimer::~FrameTimer()
{
	    
}

void FrameTimer::Start()
{
    // Get the start time, and store the last time
	m_ulStartTime = timeGetTime();
	m_ulLastTime = m_ulStartTime;

	// Initialize the variables that hold data that we
    // will be using.
    m_fTimeForFrame = 0;
    m_fElapsedTime = 0;
    m_iAbsoluteTime = 0;
    m_fFPS = 0;
    m_fAvgFPS = 0;

	// This variable holds how many seconds have passed since the last update 
    seconds = 0;
    // This var holds the amount of frames passed in that time
    dwNumFrames = 0;
}

void FrameTimer::Update()
{
	// First increment the frame count. Because we are calling
    // this function ONCE every frame, NOT MORE!
	m_dwTotalFrames ++;

	m_ulTime = timeGetTime();
	m_fTimeForFrame = (float)(m_ulTime - m_ulLastTime)/ 1000.0f;
	m_fElapsedTime = (float)(m_ulTime - m_ulStartTime)/1000.0f;
	m_ulLastTime = m_ulTime;
    m_iAbsoluteTime = (m_ulTime - m_ulStartTime)/1000;

	// Calculate the total time uptil now. So just add on the elapsed time :)
	m_fElapsedTime += m_fTimeForFrame;

    // Increment the frame variable
    dwNumFrames++;
    // Add the frame time to teh seconds variable
    seconds += m_fTimeForFrame;

    // Check if one second has passed. If yes then
    if( seconds >= 1.0f )
    {
        // Calculate FPS
        m_fFPS = float( dwNumFrames / seconds );
        // Restart the variables
        seconds = 0; 
        dwNumFrames = 0;

        // Calculate the average fps
        m_fAvgFPS = (float)m_dwTotalFrames/(float)m_fElapsedTime;
    }
}