How to Allocating Uncompressed Buffers by "ID3D11Device::CreateTexture2D"?

Question

Hello everyone,

i'm writing video decoder MFT based on D3D11 or DXVA, and i refer to MS document: http://msdn.microsoft.com/en-us/library/windows/desktop/hh162912(v=vs.85).aspx, when i want create texture for store video buffer, but i want to Create a 2D texture array by calling ID3D11Device::CreateTexture2D, always failed to E_INVALIDARG about this function CreateTexture2D, can someone know how to create ID3D11Texture2D interface?

as below my code:

....

ComPtr<ID3D11Device> pD3DDevice;
ComPtr<ID3D11Texture2D> pInTex;
D3D11_TEXTURE2D_DESC textureDesc = {0};
textureDesc.Width = m_imageWidthInPixels;
textureDesc.Height = m_imageWidthInPixels;
textureDesc.Format = DXGI_FORMAT_420_OPAQUE
textureDesc.Usage = D3D11_USAGE_DYNAMIC
textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
textureDesc.MiscFlags = 0;
textureDesc.MipLevels = 1;
textureDesc.ArraySize = 1;
textureDesc.SampleDesc.Count = 1;
textureDesc.SampleDesc.Quality = 0;
textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_DECODER;

hr = pD3DDevice->CreateTexture2D(&textureDesc, nullptr, &pInTex);
if (FAILED(hr))
{
return (-1);
}

....

Could you give me a hand, Thanks

Jackic

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one work one gain!

Answer 1

Hi Jackic,

Hopefully you've got more code initializing the ID3D11Device then what your showing... a lot more.  Either way, there are some good examples of using CreateTexture2D.  After looking at the list of online samples, the one titled "Direct2D effects photo adjustment app sample" as GOT to have a CreateTexture2D in it, but I have not actually used it so can not be sure.

I am sure that the 3D samples "Direct3D tutorial", and "Xaml DirectX 3D shooting game" both demonstrate the use of CreateTexture2D.

Good luck

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Jim Tomasko

Answer 2

Thanks Jim Tomasko,

I have refered to the sample "Direct3D tutorial sample", if i set those parameter same as the example, then created ok, but because i want to create video decoder, so i change many parameter ,such as: 

textureDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
textureDesc.Usage = D3D11_USAGE_DEFAULT;
textureDesc.CPUAccessFlags = 0;
textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;

change to:

//data format is YUV420

textureDesc.Format = DXGI_FORMAT_420_OPAQUE
textureDesc.Usage = D3D11_USAGE_DYNAMIC
textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;

//The binding flags (BindFlags) should include the D3D11_BIND_DECODER flag,

textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE | D3D11_BIND_DECODER; 

after changed, create failed, so i donot know how to set those parameter for video decoder.

thanks

Jackic

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one work one gain!

Answer 3

1: 420O format can't be created with D3D11_CPU_ACCESS_WRITE, this is because 420O is opaque format, thus you don't know what is actual format (or bit layout), thus it must be accessed via GPU only, thus no CPU access (read and write) is allowed.

2: As above 1: said, 420O format must be bound to at least one GPU pipeline, that said, you can't have 0 in bind flags.

3: As above 1&2: said, 420O format must be created with D3D11_USAGE_DEFAULT.

4: Depending on your hardware support, but mostly, 420O format can't be bound to 3D pipeline, thus binding SHADER_RESOURCE (= 3D pipe input) is not allowed with 420O with many hardware/driver. You can check it by ID3D11Device::CheckFormatSupport API.

5: Depending on your hardware support, creating texture array in 420O requires DECODER binding. For example, at 9_x feature level, DECODER binding must be specified for texture array.

Answer 4

thanks to Hideyuki Nagase,

I've created successfully.

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one work one gain!