C# System.Buffer类代码示例

			public static Buffer Make(byte[] buffer)
			{
				Buffer b = new Buffer();
				b.buf = buffer;
				b.bytesize = (uint)buffer.Length;
				return b;
			}

 public BufferPool()
 {
     for (int i = 0; i < PoolSize; i++)
     {
         pool[i] = new Buffer(this, BufferLength);
     }
 }

        public ParticleSystem(GraphicsDevice device, ContentManager content)
        {
            this.device = device;

            // Create vertex buffer used to spawn new particles
            this.particleStart = Buffer.Vertex.New<ParticleVertex>(device, MAX_NEW);

            // Create vertex buffers to use for updating and drawing the particles alternatively
            var vbFlags = BufferFlags.VertexBuffer | BufferFlags.StreamOutput;
            this.particleDrawFrom = Buffer.New<ParticleVertex>(device, MAX_PARTICLES, vbFlags);
            this.particleStreamTo = Buffer.New<ParticleVertex>(device, MAX_PARTICLES, vbFlags);

            this.layout = VertexInputLayout.FromBuffer(0, this.particleStreamTo);
            this.effect = content.Load<Effect>("ParticleEffect");
            this.texture = content.Load<Texture2D>("Dot");

            this.viewParameter = effect.Parameters["_view"];
            this.projParameter = effect.Parameters["_proj"];
            this.lookAtMatrixParameter = effect.Parameters["_lookAtMatrix"];
            this.elapsedSecondsParameter = effect.Parameters["_elapsedSeconds"];
            this.camDirParameter = effect.Parameters["_camDir"];
            this.gravityParameter = effect.Parameters["_gravity"];
            this.textureParameter = effect.Parameters["_texture"];
            this.samplerParameter = effect.Parameters["_sampler"];
            this.updatePass = effect.Techniques["UpdateTeq"].Passes[0];
            this.renderPass = effect.Techniques["RenderTeq"].Passes[0];
        }

 private void ReadOne(Buffer buffer, LowLevelTcpConnection connection)
 {
     connection.ReadAsync(buffer.Segment.Array, buffer.Segment.Offset, buffer.Segment.Count,
         readBytes =>
             {
                 var readSegment = new ArraySegment<byte>(buffer.Segment.Array, 0, buffer.Segment.Offset + readBytes);
                 int headersSize;
                 var headers = TryParse(readSegment, out headersSize);
                 if (headers != null)
                 {
                     FixBuffer(buffer.Segment.Array, headersSize, buffer.Segment.Offset + readBytes);
                     StartHttp(headers, buffer.Segment.Array, connection);
                 }
                 else
                 {
                     ReadOne(new Buffer()
                                 {
                                     Segment =
                                         new ArraySegment<byte>(buffer.Segment.Array,
                                                                buffer.Segment.Offset + readBytes,
                                                                buffer.Segment.Count - readBytes),
                                 }, connection);
                 }
             });
 }

        protected override void DoInitialize()
        {
            {
                // particleSimulator-fountain.comp is also OK.
                var shaderCode = new ShaderCode(File.ReadAllText(@"shaders\ParticleSimulatorRenderer\particleSimulator.comp"), ShaderType.ComputeShader);
                this.computeProgram = shaderCode.CreateProgram();
            }
            {
                Buffer buffer = this.positionBuffer;
                Texture texture = buffer.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
                texture.Initialize();
                this.positionTexture = texture;
            }
            {
                Buffer buffer = this.velocityBuffer;
                Texture texture = buffer.DumpBufferTexture(OpenGL.GL_RGBA32F, autoDispose: false);
                texture.Initialize();
                this.velocityTexture = texture;
            }
            {
                const int length = 64;
                UniformBuffer buffer = UniformBuffer.Create(typeof(vec4), length, BufferUsage.DynamicCopy);
                buffer.Bind();
                OpenGL.BindBufferBase((BindBufferBaseTarget)BufferTarget.UniformBuffer, 0, buffer.BufferId);
                buffer.Unbind();
                this.attractorBuffer = buffer;

                OpenGL.CheckError();
            }
        }

        public Minimap(Device device, DeviceContext dc, int minimapWidth, int minimapHeight, Terrain terrain, CameraBase viewCam) {
            _dc = dc;

            _minimapViewport = new Viewport(0, 0, minimapWidth, minimapHeight);

            CreateMinimapTextureViews(device, minimapWidth, minimapHeight);

            _terrain = terrain;

            SetupOrthoCamera();
            _viewCam = viewCam;

            // frustum vb will contain four corners of view frustum, with first vertex repeated as the last
            var vbd = new BufferDescription(
                VertexPC.Stride * 5,
                ResourceUsage.Dynamic,
                BindFlags.VertexBuffer,
                CpuAccessFlags.Write,
                ResourceOptionFlags.None,
                0
            );
            _frustumVB = new Buffer(device, vbd);

            _edgePlanes = new[] {
                new Plane(1, 0, 0, -_terrain.Width / 2),
                new Plane(-1, 0, 0, _terrain.Width / 2),
                new Plane(0, 1, 0, -_terrain.Depth / 2),
                new Plane(0, -1, 0, _terrain.Depth / 2)
            };

            ScreenPosition = new Vector2(0.25f, 0.75f);
            Size = new Vector2(0.25f, 0.25f);
        }

        public SegmentRenderer()
        {
            m_program = TriangleProgram.Instance;
            m_instances = new List<SegmentInstance>();

            m_vao = new VertexArray();

            GL.BindVertexArray(m_vao);
            GL.UseProgram(m_program);

            m_bufferSprite = new Buffer<SegmentData>();
            m_bufferTriangle = new Buffer<Vector3>();

            m_program.Position.SetValue(m_bufferSprite.GetView<Vector3>("Position"));

            m_program.Color.SetValue(m_bufferSprite.GetView<Color4ub>("Color"));
            //m_program.Position.SetDivisor(1);
               // m_program.Normal.SetValue(m_bufferSprite.GetView<Vector3>("Normal"));
               //// m_program.Normal.SetDivisor(1);
               // m_program.Transform.SetValue(m_bufferSprite.GetView<Matrix4>("Transform"));
               // //m_program.Transform.SetDivisor(1);
               // m_program.TextureOrigin.SetValue(m_bufferSprite.GetView<Vector2>("TextureOrigin"));
               // //m_program.TextureOrigin.SetDivisor(1);
               // m_program.TextureTarget.SetValue(m_bufferSprite.GetView<Vector2>("TextureTarget"));
            //m_program.TextureTarget.SetDivisor(1);

            GL.BindVertexArray(null);

            m_isDirty = true;
        }

		public static bool Insert(Buffer dest, Buffer source)
		{
			if (dest.BitsLeft() < source.BitsLeft())
				return false;

			Bitstream.Buffer tmp = new Bitstream.Buffer();
			Copy(tmp, source);

			while (tmp.BitsLeft() > 0)
			{
				if (tmp.bitpos > 0)
				{
					uint bits = (uint)(8 - tmp.bitpos);
					if (bits > tmp.BitsLeft())
					{
						bits = tmp.BitsLeft();
					}
					Bitstream.PutBits(dest, bits, Bitstream.ReadBits(tmp, bits));
				}
				if (tmp.BitsLeft() > 32)
					Bitstream.PutBits(dest, 32, Bitstream.ReadBits(tmp, 32));

				uint left = tmp.BitsLeft();
				if (left >= 8)
				{
					Bitstream.PutBits(dest, 8, Bitstream.ReadBits(tmp, 8));
				}
				else if (left > 0)
				{
					Bitstream.PutBits(dest, left, Bitstream.ReadBits(tmp, left));
				}
			}
			return true;
		}

        public ConsoleViewModel(
            ISyncThingManager syncThingManager,
            IConfigurationProvider configurationProvider)
        {
            this.syncThingManager = syncThingManager;
            this.LogMessages = new Queue<string>();

            // Display log messages 100ms after the previous message, or every 500ms if they're arriving thick and fast
            this.logMessagesBuffer = new Buffer<string>(TimeSpan.FromMilliseconds(100), TimeSpan.FromMilliseconds(500));
            this.logMessagesBuffer.Delivered += (o, e) =>
            {
                foreach (var message in e.Items)
                {
                    this.LogMessages.Enqueue(message);
                    if (this.LogMessages.Count > maxLogMessages)
                        this.LogMessages.Dequeue();
                }

                this.NotifyOfPropertyChange(() => this.LogMessages);
            };

            this.syncThingManager.MessageLogged += (o, e) =>
            {
                this.logMessagesBuffer.Add(e.LogMessage);
            };
        }

        public Skybox(GraphicsDevice device)
        {
            float x = 0.525731f;
            float z = 0.850651f;

            var vertices = new SkyboxVertex[12]
            {
                new SkyboxVertex(-x, 0f, z), new SkyboxVertex(x, 0f, z),
                new SkyboxVertex(-x, 0f, -z), new SkyboxVertex(x, 0f, -z),
                new SkyboxVertex(0f, z, x), new SkyboxVertex(0f, z, -x),
                new SkyboxVertex(0f, -z, x), new SkyboxVertex(0f, -z, -x),
                new SkyboxVertex(z, x, 0f), new SkyboxVertex(-z, x, 0f),
                new SkyboxVertex(z, -x, 0f), new SkyboxVertex(-z, -x, 0f),
            };

            var indices = new int[60]
            {
                1,4,0,  4,9,0,  4,5,9,  8,5,4,  1,8,4,
                1,10,8, 10,3,8, 8,3,5,  3,2,5,  3,7,2,
                3,10,7, 10,6,7, 6,11,7, 6,0,11, 6,1,0,
                10,1,6, 11,0,9, 2,11,9, 5,2,9,  11,2,7
            };

            vertexBuffer = Buffer<SkyboxVertex>.New(device, vertices, BufferFlags.VertexBuffer);
            indexBuffer = Buffer<int>.New(device, indices, BufferFlags.IndexBuffer);
            skyboxEffect = EffectLoader.Load(@"Graphics/Shaders/Skybox.fx");
            skyboxTex = Texture2D.Load(device, @"G:\Users\Athrun\Documents\Stratum\trunk\src\Stratum\WorldEngine\Earth\milkyWay.tif");
        }

 private void Read_file(string filename, Action<Buffer> continueWith) {
     using (var fileStream = File.Open(filename, FileMode.Open, FileAccess.Read)) {
         var buffer = new Buffer();
         buffer.LengthUsed = fileStream.Read(buffer.Content, 0, buffer.Content.Length);
         continueWith(buffer);
     }
 }

 public MyModel(Project1Game game, VertexPositionColor[] shapeArray, String textureName)
 {
     this.vertices = Buffer.Vertex.New(game.GraphicsDevice, shapeArray);
     this.inputLayout = VertexInputLayout.New<VertexPositionColor>(0);
     vertexStride = Utilities.SizeOf<VertexPositionColor>();
     modelType = ModelType.Colored;
 }

 public void Process(Buffer buffer) {
     if (first) {
         first = false;
         First_Buffer(buffer);
     }
     All_Buffers(buffer);
 }

        public Worker(int threadCount, int blockLength, IHash hasher, FileStream stream)
        {
            mainThread = Thread.CurrentThread;
            this.threadCount = threadCount;
            this.stream = stream;
            this.hasher = hasher;

            this.blockLength = blockLength;
            threads = new List<Thread>(threadCount);

            for (int i = 0; i < threadCount; ++i)
            {
                var b = new Buffer();
                b.raw = new byte[blockLength];
                bufferQueue.AddToQueue(b);
            }

            blockCount = stream.Length / blockLength;
            if (stream.Length % blockLength != 0)
            {
                blockCount++;
            }

            Console.CancelKeyPress += new ConsoleCancelEventHandler(Cancel);
        }

        private void OnLoad(object sender, EventArgs e)
        {
            // initialize shader (load sources, create/compile/link shader program, error checking)
            // when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
            _program = ProgramFactory.Create<ExampleProgram>();
            // this program will be used all the time so just activate it once and for all
            _program.Use();

            // create vertices for a triangle
            var vertices = new[] { new Vector3(-1,-1,0), new Vector3(1,-1,0), new Vector3(0,1,0) };

            // create buffer object and upload vertex data
            _vbo = new Buffer<Vector3>();
            _vbo.Init(BufferTarget.ArrayBuffer, vertices);

            // create and bind a vertex array
            _vao = new VertexArray();
            _vao.Bind();
            // set up binding of the shader variable to the buffer object
            _vao.BindAttribute(_program.InPosition, _vbo);

            // set camera position
            Camera.DefaultState.Position = new Vector3(0,0,3);
            Camera.ResetToDefault();

            // set a nice clear color
            GL.ClearColor(Color.MidnightBlue);
        }