使用SlimDX和C＃的绘图点列表

Question

我刚刚开始学习SlimDX框架，并尝试使用C＃绘制一个非常简单的带有点的示例。我编写了所有代码，但是尽管ClearRenderTargetView（）可以正常工作，但它没有画出点。

如果有人可以帮助我并告诉我我哪里做错了，我将不胜感激。预先谢谢你。

这是我的代码：

PointList类：

class PointList
{
    IntPtr formHandle;
    SwapChain swapChain;
    Device device;
    Buffer vertexBuffer;
    RenderTargetView renderTargetView;
    Viewport viewport;
    VertexShader vertexShader;
    PixelShader pixelShader;
    ShaderSignature shaderSignature;
    InputLayout inputLayout;

    public PointList(IntPtr fHandle)
    {
        formHandle = fHandle;
        swapChain = null;
        device = null;
        vertexBuffer = null;
        renderTargetView = null;
        viewport = null;
        vertexShader = null;
        pixelShader = null;
        shaderSignature = null;
        inputLayout = null;
    }

    public bool Init(int width, int height)
    {
        var description = new SwapChainDescription()
        {
            BufferCount = 2,
            Usage = Usage.RenderTargetOutput,
            IsWindowed = true,
            OutputHandle = formHandle,
            ModeDescription = new ModeDescription(0, 0, new Rational(60, 1), Format.R8G8B8A8_UNorm),
            SampleDescription = new SampleDescription(1, 0),
            Flags = SwapChainFlags.None,
            SwapEffect = SwapEffect.Discard
        };

        Device.CreateWithSwapChain(DriverType.Hardware, DeviceCreationFlags.None, description, out device, out swapChain);

        var context = device.ImmediateContext;

        using (var resource = Resource.FromSwapChain<Texture2D>(swapChain, 0))
            renderTargetView = new RenderTargetView(device, resource);
        viewport = new Viewport(0, 0, width, height);
        context.OutputMerger.SetTargets(renderTargetView);
        context.Rasterizer.SetViewports(viewport);

        using (var bytecode = ShaderBytecode.CompileFromFile("point_list.fx", "VShader", "vs_4_0", ShaderFlags.None, EffectFlags.None))
        {
            vertexShader = new VertexShader(device, bytecode);
            shaderSignature = ShaderSignature.GetInputSignature(bytecode);
        }

        using (var bytecode = ShaderBytecode.CompileFromFile("point_list.fx", "PShader", "ps_4_0", ShaderFlags.None, EffectFlags.None))
            pixelShader = new PixelShader(device, bytecode);

        var vertices = new DataStream(12 * 5, true, true);
        vertices.Write(new Vector3(0.0f, 0.0f, 0.0f));
        vertices.Write(new Vector3(0.5f, 1.0f, 0.0f));
        vertices.Write(new Vector3(1.0f, 0.1f, 0.0f));
        vertices.Write(new Vector3(1.5f, 0.9f, 0.0f));
        vertices.Write(new Vector3(2.0f, 0.2f, 0.0f));
        vertices.Position = 0;

        var elements = new[] { new InputElement("POSITION", 0, Format.R32G32B32_Float, 0) };
        inputLayout = new InputLayout(device, elements, shaderSignature);
        vertexBuffer = new Buffer(device, vertices, 12 * 5, ResourceUsage.Default, BindFlags.VertexBuffer, CpuAccessFlags.None, ResourceOptionFlags.None, 0);

        context.InputAssembler.InputLayout = inputLayout;
        context.InputAssembler.PrimitiveTopology = PrimitiveTopology.PointList;
        context.InputAssembler.SetVertexBuffers(0, new VertexBufferBinding(vertexBuffer, 12, 0));

        context.VertexShader.Set(vertexShader);
        context.PixelShader.Set(pixelShader);

        return true;
    }

    public void Render()
    {
        var context = device.ImmediateContext;
        context.ClearRenderTargetView(renderTargetView, Color.White);
        context.Draw(5, 0);
        swapChain.Present(0, PresentFlags.None);
    }

    public void Dispose()
    {
        device.Dispose();
        swapChain.Dispose();
        vertexBuffer.Dispose();
        vertexShader.Dispose();
        pixelShader.Dispose();
        inputLayout.Dispose();
        shaderSignature.Dispose();
        renderTargetView.Dispose();
    }

主要：

static void Main(string[] args)
    {
        var form = new RenderForm("Point List");
        PointList pl = new PointList(form.Handle);

        if(!pl.Init(form.ClientSize.Width, form.ClientSize.Height))
        {
            return;
        }

        MessagePump.Run(form, () =>
        {
            pl.Render();
        });

        pl.Dispose();
    }