Method Execute

trinity/RenderJob/TriStepRenderFps.cpp:84–288

TriStepResult TriStepRenderFps::Execute( Be::Time realTime, Be::Time simTime, Tr2RenderContext& renderContext )
{
	// these values are static for this implementation, but it should be considered
	// to change this in a follwing sprint
	const float fpsCalculationTime = 0.25f;

	// position of the fps, left top corner
	Tr2Rect screenFPSPos;
	const TriViewport& vp = renderContext.m_esm.GetViewport();
	screenFPSPos.left = vp.x + m_displayX;
	screenFPSPos.top = vp.y + m_displayY;
	screenFPSPos.right = vp.x + vp.width - m_displayX;
	screenFPSPos.bottom = vp.y + vp.height - m_displayY;

	// this enables access to the fps
	BeInfo* beOSInfo = BeOS->GetInfo();

	uint32_t textColor;
	// TimeAsDouble is formating the time from a int64 in nanoseconds to
	// a double where seconds are the first digit before the .
	double nowTime = TimeAsDouble( beOSInfo->mRealTime );

	// to calculate the average the fps of every frame gets collected
	m_FPSValuesCount += 1;
	m_sumFPSValues += beOSInfo->mFps;

	// This is not the best timing functionality but it is simple and correct enough
	// for these purposes (the timing is most likely a few nanoseconds off, due to the
	// fact that this doesn't check for the exact time)
	if( nowTime >= m_nextFPSCalculationTime )
	{
		//timer control
		m_nextFPSCalculationTime = ( nowTime + fpsCalculationTime );

		// calculate the avarege fps and ms
		m_averageFPS = m_sumFPSValues / m_FPSValuesCount;
		if( m_averageFPS < 1e-5f )
		{
			m_averageMSPerFrame = 0.0f;
		}
		else
		{
			m_averageMSPerFrame = 1.0f / m_averageFPS * 1000;
		}

		// clean up for the new average calculation
		m_sumFPSValues = 0.0f;
		m_FPSValuesCount = 0;
	}

	// Set the print color
	// over 60fps green
	// between 60 and 30 fps orange
	// under 30 fps red
	// rgb color calculator http://www.drpeterjones.com/colorcalc/
	if( m_averageFPS > 59.9f )
	{
		textColor = 0xff00ff00;