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我有一个 DirectX 渲染，当我渲染到屏幕上时效果很好：

var DxDevice = D3D.D3DDevice.CreateDeviceAndSwapChain(host.Handle);
...
var DxFinalRenderTexture = DxDevice.SwapChain.GetBuffer<D3D.Texture2D>(0);
var DxFinalRenderTarget = DxDevice.CreateRenderTargetView(DxFinalRenderTexture);

DxDevice.OM.RenderTargets = new D3D.OutputMergerRenderTargets(new D3D.RenderTargetView[] { DxFinalRenderTarget }, null);
DxTechnique.GetPassByIndex(0).Apply();
DxDevice.Draw(4, 0);

DxDevice.SwapChain.Present(0, GX.PresentOptions.None);

（这里省略了输入布局和顶点缓冲区，因为正如我所说，渲染按预期在屏幕上工作）。

当我稍微改变它以使用不同的渲染目标而不是屏幕时：

var description = new D3D.Texture2DDescription() {
  Width = 1024,
  Height = 1024,
  ArraySize = 1,
  BindingOptions = D3D.BindingOptions.RenderTarget | D3D.BindingOptions.ShaderResource,
  CpuAccessOptions = D3D.CpuAccessOptions.None,
  Format = DX.Graphics.Format.B8G8R8A8UNorm,
  MipLevels = 1,
  MiscellaneousResourceOptions = D3D.MiscellaneousResourceOptions.None,
  SampleDescription = new DX.Graphics.SampleDescription(1, 0),
  Usage = D3D.Usage.Default
};
var DxFinalRenderTexture = DxDevice.CreateTexture2D(description);
var description2 = new D3D.RenderTargetViewDescription() {
  Format = description.Format,
  ViewDimension = D3D.RenderTargetViewDimension.Texture2D,
  Texture2D = new D3D.Texture2DRenderTargetView() { MipSlice = 0 }
};
var DxFinalRenderTarget = DxDevice.CreateRenderTargetView(DxFinalRenderTexture, description2);

最后通过适当地将纹理复制到暂存资源并映射后者来保存纹理：

private WriteableBitmap GetTexture(D3D.Texture2D texture) {
  var description = new D3D.Texture2DDescription() {
    Width = 1024,
    Height = 1024,
    ArraySize = 1,
    BindingOptions = D3D.BindingOptions.None,
    CpuAccessOptions = D3D.CpuAccessOptions.Read,
    Format = DX.Graphics.Format.B8G8R8A8UNorm,
    MipLevels = 1,
    MiscellaneousResourceOptions = D3D.MiscellaneousResourceOptions.None,
    SampleDescription = new DX.Graphics.SampleDescription(1, 0),
    Usage = D3D.Usage.Staging
  };
  var texture2 = DxDevice.CreateTexture2D(description);
  DxDevice.CopyResource(texture2, texture);

  var texmap = texture2.Map(0, D3D.Map.Read, D3D.MapOptions.None);
  var bitmap = new WriteableBitmap(1024, 1024, 96, 96, PixelFormats.Pbgra32, null);
  bitmap.Lock();
  bitmap.WritePixels(new Int32Rect(0, 0, 1024, 1024), texmap.Data, 1024 * 1024 * 4, 1024 * 4);
  bitmap.Unlock();
  texture2.Unmap(0);
  return bitmap;
}

生成的位图将完全为空。编译和运行过程中都没有错误，只有空虚。

还可能值得注意的是，我不需要重复渲染帧，只需要创建一个位图，因此不涉及性能问题。我很乐意完全取消屏幕渲染并渲染到我以后可以使用的最终位图。

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