Method WriteParticleVerticesToBuffer

trinity/Tr2CurveLineSet.cpp:282–349

------------------------------------------------------------------------------------------------------ Description: Populate vertex buffer with particle line data. Attributes: pos1 - start position of line segment col1 - color at start of line segment length1 - how far along the line does this segment start pos2 - end position of segment col2 - end color of segment length2 - ow far along the line

//   buffer - the vertex buffer
// ------------------------------------------------------------------------------------------------------
void Tr2CurveLineSet::WriteParticleVerticesToBuffer(
	const Vector3& pos1,
	const Color& col1,
	float length1,
	const Vector3& pos2,
	const Color& col2,
	float length2,
	unsigned int lineID,
	LineVertex* buffer )
{
	// line info
	const LineData* lineData = &m_lines[lineID];

	// direction position hint for the vertexshader
	Vector3 dirOffset = pos2 - pos1;

	// random
	float randomVal = (float)rand() / (float)RAND_MAX;

	// tri0 - v0
	buffer[0].position = pos1;
	buffer[0].lineDir = Vector4( dirOffset, -1.f * m_lineWidthFactor * lineData->width );
	buffer[0].beginEnd = Vector4( -1.f * m_lineWidthFactor * lineData->width, length1, randomVal, length2 - length1 );
	buffer[0].color = SwizzleColor( col1 );
	buffer[0].overrideColor = SwizzleColor( lineData->multiColor );
	buffer[0].overlayColor = SwizzleColor( lineData->overlayColor );
	buffer[0].animationData = lineData->intermediatePosition;
	// tri0 - v1
	buffer[1].position = pos1;
	buffer[1].lineDir = Vector4( dirOffset, m_lineWidthFactor * lineData->width );
	buffer[1].beginEnd = Vector4( -1.f * m_lineWidthFactor * lineData->width, length1, randomVal, length2 - length1 );
	buffer[1].color = SwizzleColor( col1 );
	buffer[1].overrideColor = SwizzleColor( lineData->multiColor );
	buffer[1].overlayColor = SwizzleColor( lineData->overlayColor );
	buffer[1].animationData = lineData->intermediatePosition;
	// tri0 - v2
	buffer[2].position = pos1;
	buffer[2].lineDir = Vector4( dirOffset, -1.f * m_lineWidthFactor * lineData->width );
	buffer[2].beginEnd = Vector4( m_lineWidthFactor * lineData->width, length2, randomVal, length2 - length1 );
	buffer[2].color = SwizzleColor( col2 );
	buffer[2].overrideColor = SwizzleColor( lineData->multiColor );
	buffer[2].overlayColor = SwizzleColor( lineData->overlayColor );
	buffer[2].animationData = lineData->intermediatePosition;
	// tri1 - v0
	buffer[3].position = pos1;
	buffer[3].lineDir = Vector4( dirOffset, m_lineWidthFactor * lineData->width );
	buffer[3].beginEnd = Vector4( -1.f * m_lineWidthFactor * lineData->width, length1, randomVal, length2 - length1 );
	buffer[3].color = col1;
	buffer[3].overrideColor = SwizzleColor( lineData->multiColor );
	buffer[3].overlayColor = SwizzleColor( lineData->overlayColor );
	buffer[3].animationData = lineData->intermediatePosition;
	// tri2 - v1
	buffer[4].position = pos1;
	buffer[4].lineDir = Vector4( dirOffset, m_lineWidthFactor * lineData->width );
	buffer[4].beginEnd = Vector4( m_lineWidthFactor * lineData->width, length2, randomVal, length2 - length1 );
	buffer[4].color = SwizzleColor( col2 );
	buffer[4].overrideColor = SwizzleColor( lineData->multiColor );
	buffer[4].overlayColor = SwizzleColor( lineData->overlayColor );