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.

Casey · Accepted Answer · 2022-01-26 06:41:25Z

4

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

edited Jan 26, 2022 at 6:41

Casey

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answered Feb 13, 2014 at 23:58

MooseBoys

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2 Comments

Mrfence Over a year ago

That looks like just what I'm looking for! But just to be clear, do you need to copy each individual mip level from a texture into the array texture, one at a time (making sure to add 1 to each destination index)

MooseBoys Over a year ago

If you're going with the CopySubresourceRegion approach, then yes, you need to copy one subresource at a time. But in that case you should consider just using the array resource to begin with so you can avoid a copy.

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