screenshot - 如何在DirectX 10中将后缓冲保存到文件中？

Question

我想使用DirectX 10逐帧渲染视频。这些帧稍后将由其他一些工具(例如mencoder或ffmpeg)进行处理。

使用D3DXSaveSurfaceToFile在DX9中这样做没有问题。

现在，在DX10中，我找到了D3DX10SaveTextureToFile，但是用它来保存我的后缓冲区没有运气。

我使用以下代码:

ID3D10Resource *backbufferRes;
_defaultRenderTargetView->GetResource(&backbufferRes);

D3D10_TEXTURE2D_DESC texDesc;
texDesc.ArraySize = 1;
texDesc.BindFlags = 0;
texDesc.CPUAccessFlags = D3D10_CPU_ACCESS_READ;
texDesc.Format = backbufferSurfDesc.Format;
texDesc.Height = backbufferSurfDesc.Height;
texDesc.Width = backbufferSurfDesc.Width;
texDesc.MipLevels = 1;
texDesc.MiscFlags = 0;
texDesc.SampleDesc = backbufferSurfDesc.SampleDesc;
texDesc.Usage = D3D10_USAGE_STAGING;

ID3D10Texture2D *texture;
HRESULT hr;
V( _device->CreateTexture2D(&texDesc, 0, &texture) );
_device->CopyResource(texture, backbufferRes);

V( D3DX10SaveTextureToFile(texture, D3DX10_IFF_DDS, filename) );
texture->Release();

这将创建一个.dds图像，我无法通过任何DDS View /编辑器打开该图像。

我的代码有什么问题？

Answer 1

所有的功劳归于gamedev.net的坟墓。

现在，问题是:

texDesc.CPUAccessFlags应为0

texDesc.Format应该是DXGI_FORMAT_R8G8B8A8_UNORM

texDesc.SampleDesc.Count应为1

texDesc.SampleDesc.Quality应为0

texDesc.Usage应该是D3D10_USAGE_DEFAULT

这样D3DX10SaveTextureToFile将保存到BMP甚至保存到PNG。

完整的代码是:

HRESULT hr;
ID3D10Resource *backbufferRes;
_defaultRenderTargetView->GetResource(&backbufferRes);

D3D10_TEXTURE2D_DESC texDesc;
texDesc.ArraySize = 1;
texDesc.BindFlags = 0;
texDesc.CPUAccessFlags = 0;
texDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
texDesc.Width = 640;  // must be same as backbuffer
texDesc.Height = 480; // must be same as backbuffer
texDesc.MipLevels = 1;
texDesc.MiscFlags = 0;
texDesc.SampleDesc.Count = 1;
texDesc.SampleDesc.Quality = 0;
texDesc.Usage = D3D10_USAGE_DEFAULT;

ID3D10Texture2D *texture;
V( _device->CreateTexture2D(&texDesc, 0, &texture) );
_device->CopyResource(texture, backbufferRes);

V( D3DX10SaveTextureToFile(texture, D3DX10_IFF_PNG, L"test.png") );
texture->Release();
backbufferRes->Release();