Method UpdateGraphicsState

trinity/Eve/UI/EveTacticalTrails.cpp:174–259

}

void EveTacticalTrails::UpdateGraphicsState( Be::Time now )
{
	m_segmentCount = accumulate( m_trackedObjects.begin(), m_trackedObjects.end(), 0u, []( uint32_t sum, const auto& object ) { return sum + static_cast<uint32_t>( std::max( object.positions.size(), size_t( 1 ) ) - 1 ); } );
	if( m_segmentCount == 0 )
	{
		return;
	}

	USE_MAIN_THREAD_RENDER_CONTEXT();
	if( !renderContext.IsValid() )
	{
		m_segmentCount = 0;
		return;
	}

	if( m_vertexDeclHandle == Tr2EffectStateManager::UNINITIALIZED_DECLARATION )
	{
		static Tr2VertexDefinition s_curveLineDataVertexDecl;
		if( s_curveLineDataVertexDecl.empty() )
		{
			Tr2VertexDefinition& tvd = s_curveLineDataVertexDecl;

			tvd.Add( tvd.FLOAT32_3, tvd.POSITION );
			tvd.Add( tvd.FLOAT32_3, tvd.TEXCOORD, 0 );
			tvd.Add( tvd.FLOAT32_1, tvd.TEXCOORD, 1 );
			tvd.Add( tvd.FLOAT32_2, tvd.TEXCOORD, 2 );
		}

		m_vertexDeclHandle = Tr2EffectStateManager::GetVertexDeclarationHandle( s_curveLineDataVertexDecl );
	}

	auto data = reinterpret_cast<LineVertex*>( Tr2Renderer::GetPoolAllocator()->Allocate( m_segmentCount * SEGMENT_VERTEX_COUNT * sizeof( LineVertex ) ) );
	if( !data )
	{
		return;
	}
	auto dest = data;
	for( auto& object : m_trackedObjects )
	{
		if( object.positions.size() < 2 )
		{
			continue;
		}

		auto ToWorld = [&]( const Vector3d& pos ) -> Vector3 {
			return ( pos - m_egoBallPosition ).AsVector3();
		};

		Vector3 pos1 = ToWorld( object.positions[0].position );
		float time1 = TimeAsFloat( now - object.positions[0].time ) / m_fadeOutTime;
		Vector3 pos2 = ToWorld( object.positions[1].position );

		for( size_t i = 0; i + 1 < object.positions.size(); ++i )
		{
			float time2 = TimeAsFloat( now - object.positions[i + 1].time ) / m_fadeOutTime;
			auto posNext = i + 2 >= object.positions.size() ? pos2 + ( pos2 - pos1 ) : ToWorld( object.positions[i + 2].position );
			WriteLineVerticesToBuffer(
				pos1,