Method AddSegment

trinity/Sprite2d/Tr2Sprite2dLineTrace.cpp:288–525

}

void Tr2Sprite2dLineTrace::AddSegment(
	Tr2Sprite2dScene* renderer,
	const Vector2& from,
	const Color& fromColor,
	float capAngleFrom,
	const Vector2& to,
	const Color& toColor,
	float capAngleTo )
{
	Vector2 d = to - from;
	float segmentLength = Length( d );
	d = Normalize( d );

	// calculate texture offset
	float texOffset1 = m_textureOffsetAccum / m_textureWidth - m_textureOffset;
	m_textureOffsetAccum += segmentLength;
	float texOffset2 = m_textureOffsetAccum / m_textureWidth - m_textureOffset;

	// Anti-aliased lines are rendered with a quad that is larger. This is then
	// compensated for in the pixel shader, using the extra pixels to fill in
	// alpha values to do the anti-aliasing

	bool isAA = m_spriteEffect == TR2_SFX_FILL_AA;
	float pixelWidthInTexels = 1;

	float halfWidth = 0.5f * m_lineWidth;

	if( isAA )
	{
		halfWidth += 2.0f;
		pixelWidthInTexels = 1.0f / ( m_lineWidth + 4.0f );
	}

	capAngleFrom = ClampAngle( capAngleFrom );
	capAngleTo = ClampAngle( capAngleTo );

	// Shorten lines to account for corners
	Vector2 adjustedFrom, adjustedTo;
	if( m_cornerType != CORNERTYPE_NONE )
	{
		float shorteningForCap = halfWidth * tan( std::abs( capAngleTo ) * 0.5f );
		adjustedTo = to - shorteningForCap * d;

		shorteningForCap = halfWidth * tan( std::abs( capAngleFrom ) * 0.5f );
		adjustedFrom = from + shorteningForCap * d;
	}
	else
	{
		adjustedTo = to;
		adjustedFrom = from;
	}

	// Rotate 90 degrees
	Vector2 normal( d.y, -d.x );

	uint32_t totalVertexCount = uint32_t( m_renderVertices.size() ) - m_drawCalls.back().vertexOffset;
	uint32_t totalIndexCount = uint32_t( m_renderIndices.size() ) - m_drawCalls.back().indexOffset;
	uint32_t segmentVertices = 4;