Question

我正在使用DirectX11和SharpDx＆amp; C＃中的WPF D3DImage将图像渲染为纹理。

之前我正在更新我的渲染目标（效果很好），而不是使用像素着色器在我的四边形中显示更新的纹理。

现在我已经意识到我的错误，我决定使用像素着色器，以便我可以在视口的帮助下实现信箱技术。

在这样做时，我有点无法弄清楚为什么我的渲染纹理是图像的子区域，而这个区域又显示为拉伸。

使用的代码：

a）初始化代码

        var device = this.Device;
        var context = device.ImmediateContext;

        byte[] fileBytes = GetShaderEffectsFileBytes();

        var vertexShaderByteCode = ShaderBytecode.Compile(fileBytes, "VSMain", "vs_5_0", ShaderFlags.None, EffectFlags.None);
        var vertexShader = new VertexShader(device, vertexShaderByteCode);
        var pixelShaderByteCode = ShaderBytecode.Compile(fileBytes, "PSMain", "ps_5_0", ShaderFlags.None, EffectFlags.None);
        var pixelShader = new PixelShader(device, pixelShaderByteCode);

        layout = new InputLayout(device, vertexShaderByteCode, new[] {
               new InputElement("SV_Position", 0, Format.R32G32B32A32_Float, 0, 0),
                new InputElement("TEXCOORD", 0, Format.R32G32_Float, 16, 0),
        });

        // Write vertex data to a datastream
        var stream = new DataStream(Utilities.SizeOf<VertexPositionTexture>() * 6, true, true);
        stream.WriteRange(new[]
                       {
                          new VertexPositionTexture(
                        new Vector4(1, 1, 0.5f, 1.0f), // position top-left
                        new Vector2(1.0f, 0.0f)
                        ),
            new VertexPositionTexture(
                        new Vector4(1, -1, 0.5f, 1.0f), // position top-right
                        new Vector2(1.0f, 1.0f)
                        ),
            new VertexPositionTexture(
                        new Vector4(-1, 1, 0.5f, 1.0f), // position bottom-left
                         new Vector2(0.0f, 0.0f)
                        ),
            new VertexPositionTexture(
                        new Vector4(-1, -1, 0.5f, 1.0f), // position bottom-right
                         new Vector2(0.0f, 1.0f)
                        ),
                  });
        stream.Position = 0;

         vertices = new SharpDX.Direct3D11.Buffer(device, stream, new BufferDescription()
        {
            BindFlags = BindFlags.VertexBuffer,
            CpuAccessFlags = CpuAccessFlags.None,
            OptionFlags = ResourceOptionFlags.None,
            SizeInBytes = Utilities.SizeOf<VertexPositionTexture>() * 6,
            Usage = ResourceUsage.Default,
            StructureByteStride = 0
        });
        stream.Dispose();

        context.InputAssembler.InputLayout = (layout);
        context.InputAssembler.PrimitiveTopology = (PrimitiveTopology.TriangleStrip);
        context.InputAssembler.SetVertexBuffers(0, new VertexBufferBinding(vertices, Utilities.SizeOf<VertexPositionTexture>(), 0));
        context.VertexShader.Set(vertexShader);
        context.GeometryShader.Set(null);
        context.PixelShader.Set(pixelShader);

        Device.ImmediateContext.OutputMerger.SetTargets(m_depthStencilView, m_RenderTargetView);
        this.ImgSource.SetRenderTargetDX11(this.RenderTarget);


        Texture2D flower = Texture2D.FromFile<Texture2D>(this.Device, "3.jpg");
        var srv = new ShaderResourceView(this.Device, flower);
        Device.ImmediateContext.PixelShader.SetShaderResource(0, srv);
        srv.Dispose();

b）VertexPositionTexture

 public struct VertexPositionTexture
{
    public VertexPositionTexture(Vector4 position, Vector2 textureUV)
    {
        Position = position;
        TextureUV = textureUV;
    }

    public Vector4 Position;
    public Vector2 TextureUV;
}

c）渲染代码

Device.ImmediateContext.ClearRenderTargetView(this.m_RenderTargetView, new Color4(Color.Blue.R, Color.Blue.G, Color.Blue.B, Color.Blue.A));
Device.ImmediateContext.ClearDepthStencilView(m_depthStencilView, DepthStencilClearFlags.Depth, 1.0f, 0);
 Device.ImmediateContext.Draw(4, 0);
 Device.ImmediateContext.Flush();
 this.ImgSource.InvalidateD3DImage();

d）着色器效果文件：

Texture2D ShaderTexture : register(t0);
SamplerState Sampler : register (s0);

struct VertexShaderInput
{
    float4 Position : SV_Position;
    float2 TextureUV : TEXCOORD0;
};

struct VertexShaderOutput
{
    float4 Position : SV_Position;
    float2 TextureUV : TEXCOORD0;
};

VertexShaderOutput VSMain(VertexShaderInput input)
{
    VertexShaderOutput output = (VertexShaderOutput)0;

    output.Position = input.Position;
    output.TextureUV = input.TextureUV;

    return output;
 }

float4 PSMain(VertexShaderOutput input) : SV_Target
{
    return ShaderTexture.Sample(Sampler, input.TextureUV);
}

同样在下面我添加了我一直有的问题的截图和应该渲染的实际图像。

实际图片
渲染的纹理失败

任何建议或帮助都会非常有用，因为我研究过网络和各种论坛，但没有运气。

感谢。

链接到Sample Test Application

纹理在DirectX11中显示为拉伸

0 个答案: