CSharpGL.ZeroIndexLineInTrianglesAdjacencySearcher.Search C# (CSharp) Метод

        internal override uint[] Search(RenderEventArgs arg,
            int x, int y,
            uint lastVertexId, ZeroIndexRenderer modernRenderer)
        {
            OneIndexBuffer buffer = Buffer.Create(IndexBufferElementType.UInt, 6, DrawMode.Lines, BufferUsage.StaticDraw);
            unsafe
            {
                var array = (uint*)buffer.MapBuffer(MapBufferAccess.WriteOnly);
                array[0] = lastVertexId - 2; array[1] = lastVertexId - 0;
                array[2] = lastVertexId - 4; array[3] = lastVertexId - 2;
                array[4] = lastVertexId - 0; array[5] = lastVertexId - 4;
                buffer.UnmapBuffer();
            }
            modernRenderer.Render4InnerPicking(arg, buffer);
            uint id = ColorCodedPicking.ReadStageVertexId(x, y);

            buffer.Dispose();

            if (id + 4 == lastVertexId)
            { return new uint[] { id + 4, id, }; }
            else
            { return new uint[] { id - 2, id, }; }
        }