Method Render

trinity/Tr2LineGraph.cpp:175–306

}

void Tr2LineGraph::Render( float scale, Tr2RenderContext& renderContext )
{
	if( m_isPrepared && ( !s_lineGraphEffect || !s_lineGraphEffect->GetShaderStateInterface() ) )
	{
		m_isPrepared = false;
	}

	if( !m_isPrepared )
	{
		PrepareResources();

		if( !m_isPrepared )
		{
			return;
		}
	}

	LineGraphVertex* pVerts;
	CR_RETURN( m_vertexBuffer.MapForWriting( pVerts, renderContext ) );

	LineGraphVertex* pVertsEnd = pVerts + m_primitiveCount * 2;

	unsigned int count = (unsigned int)m_data.size();

	float step = 2.0f / ( (float)count - 1.0f );

	float x = -1.0f;

	m_maxValue = 0.0f;

	// Data is stored in a circular buffer - start at the oldest one,
	// where the current index is and the next item would go.
	float* p = &m_data[m_currentIx];
	for( unsigned int i = m_currentIx; i < count - 1; ++i )
	{
		if( *p > m_maxValue )
		{
			m_maxValue = *p;
		}

		pVerts->pos.x = x;
		pVerts->pos.y = *p;
		++pVerts;

		pVerts->pos.x = x + step;
		pVerts->pos.y = *( p + 1 );
		++pVerts;

		++p;
		x += step;
	}

	// Then take the ones from the start of the buffer up the current index.
	if( m_currentIx > 0 )
	{
		// curIx is unsigned, so the condition in the for loop below is not
		// enough to prevent iterating when curIx is 0.