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I'm making a 2D game in which I create some textures dynamically for displaying as simple 2D quads. To achieve this, I call ID3D11Device::CreateTexture2D that requires a D3D11_TEXTURE2D_DESC.

typedef struct D3D11_TEXTURE2D_DESC {
  UINT             Width;
  UINT             Height;
  UINT             MipLevels;
  UINT             ArraySize;
  DXGI_FORMAT      Format;
  DXGI_SAMPLE_DESC SampleDesc;
  D3D11_USAGE      Usage;
  UINT             BindFlags;
  UINT             CPUAccessFlags;
  UINT             MiscFlags;
} D3D11_TEXTURE2D_DESC;

One of the fields is MipLevels. What I understand about this is that mipmaps consist of a collection of the same texture downscaled for better representation and performance of them when they are far away from the view camera.

Since what I'm making is a 2D game, I don't need this feature and I want to disable it. Is there any way to do so? At first, I thought I could just set miplevels parameter to 0, but then I read this:

MipLevels Type: UINT The maximum number of mipmap levels in the texture. See the remarks in D3D11_TEX1D_SRV. Use 1 for a multisampled texture; or 0 to generate a full set of subtextures.

and:

pInitialData [in] Type: const D3D11_SUBRESOURCE_DATA* A pointer to an array of D3D11_SUBRESOURCE_DATA structures that describe subresources for the 2D texture resource. Applications cannot specify NULL for pInitialData when creating IMMUTABLE resources (see D3D11_USAGE). If the resource is multisampled, pInitialData must be NULL because multisampled resources cannot be initialized with data when they are created.

This is what confuses me. I want to create an IMMUTABLE 2D texture (once it's dynamically generated at runtime it's not going to change anymore) plus I don't want any mipmap levels. How am I supposed to do this?

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1 Answer 1

up vote 1 down vote accepted

If you set your MiPLevels to 1, and ArraySize to 1, it will just have one miplevel. thats all you do to it. beacuse you cannot simply "disable" mipmaping, since it´s a part of the GPU pipeline.

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The problem is that I want an IMMUTABLE resource and it says that multisampled resources can't be initialized when they are created. (Thus, I cannot create it as immutable. This doesn't make much sense to me. :/) –  Kaboose May 8 '13 at 10:15
    
you have to fill the texture up with data when you create it. thats all. –  Tordin May 8 '13 at 10:35
    
Just tried it and it actually works, despite what msdn says. Thanks. –  Kaboose May 8 '13 at 15:40
    
They can sometimes write their docs in a confusing way. –  Tordin May 10 '13 at 11:23

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