C# (CSharp) GLBuffer.Use示例

示例#1

        private MapChunkData _initChunkBuffers(IMapGrid grid, IMapChunk chunk)
        {
            var vao = (uint)GL.GenVertexArray();

            GL.BindVertexArray(vao);

            var vboSize = _verticesPerChunk(chunk) * Vertex2D.SizeOf;
            var eboSize = _indicesPerChunk(chunk) * sizeof(ushort);

            var vbo = new GLBuffer(this, BufferTarget.ArrayBuffer, BufferUsageHint.DynamicDraw,
                                   vboSize, $"Grid {grid.Index} chunk {chunk.Indices} VBO");
            var ebo = new GLBuffer(this, BufferTarget.ElementArrayBuffer, BufferUsageHint.DynamicDraw,
                                   eboSize, $"Grid {grid.Index} chunk {chunk.Indices} EBO");

            ObjectLabelMaybe(ObjectLabelIdentifier.VertexArray, vao, $"Grid {grid.Index} chunk {chunk.Indices} VAO");
            // Vertex Coords
            GL.VertexAttribPointer(0, 2, VertexAttribPointerType.Float, false, Vertex2D.SizeOf, 0);
            GL.EnableVertexAttribArray(0);
            // Texture Coords.
            GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, Vertex2D.SizeOf, 2 * sizeof(float));
            GL.EnableVertexAttribArray(1);

            // Assign VBO and EBO to VAO.
            // OpenGL 3.x is such a good API.
            vbo.Use();
            ebo.Use();

            var datum = new MapChunkData(vao, vbo, ebo)
            {
                Dirty = true
            };

            _mapChunkData[grid.Index].Add(chunk.Indices, datum);
            return(datum);
        }