DirectX 11 Loading multiple textures into Texture2DArray

Question

Is there a way of taking an array of ID3D11Texture2D* objects and putting them together in a single ID3D11Texture2D* (with an appropriate ArraySize value) that will allow me to use a Texture2DArray in HLSL with them?

At the very least, how do you pass in the individual textures when creating a new ID3D11Texture2D object after you have set ArraySize to greater than 1? Do you need to pass in an array of SUBRESOURCE_DATA structs with each pointing to a texture to the CreateTexture2D function? I've been looking around for an answer to this, but the documentation seems severely lacking.

Thanks for any help you can provide.

Answer 1

To copy existing textures to a texture array, you can use CopySubresourceRegion using the destination subresource index described below.

To create a new texture array with initial data, you specify multiple subresources (array slices / mip levels) using an array of SUBRESOURCE_DATA structures. Subresource index is defined as mip slice + array slice * mip leves. So for a 2-slice 3-MIP texture array, you would have the following subresources:

[0]: slice 0 mip 0
[1]: slice 0 mip 1
[2]: slice 0 mip 2
[3]: slice 1 mip 0
[4]: slice 1 mip 1
[5]: slice 1 mip 2

This is described in more detail at the following page: https://learn.microsoft.com/en-us/windows/win32/direct3d11/overviews-direct3d-11-resources-subresources