'Texture format DXGI_FORMAT_NV12 does not support mipmaps

I have a source texture ID3D11Texture2D with the format DXGI_FORMAT_NV12. I am trying to copy a subregion of this texture (D3D11DeviceContext::CopySubresourceRegion) and then generate a full mipmap chain down to 1x1 on the destination texture.

To generate a full set of subtextures I include the following in the destination texture's description:

D3D11_TEXTURE2D_DESC desc {};
desc.MipLevels = 0;

The problem is that the data format DXGI_FORMAT_NV12 does not support mipmaps:

D3D11 ERROR: ID3D11Device::CreateTexture2D: Invalid MipLevels (0).
The format (0x67, NV12) does not support mipmapping, so MipLevels must be 1.
[ STATE_CREATION ERROR #102: CREATETEXTURE2D_INVALIDMIPLEVELS]

How do I cast the source texture to the appropriate format to generate a full set of mipmaps on the subresource? Or, what else can be done to get around this issue?

c++directxdirectx-11texture-mappingtexture2d


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