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craigbrad

Generating mipmaps in DirectX 11

8 posts in this topic

Hi,

 

I'm wanting to generate a full chain of mip-maps right down to 1x1 so that I can get the average luminosity of my rendered scene.

How would I go about doing this in DirectX 11?

I have setup the D3D11_TEXTURE2D_DESC with the right misc flags and was wondering what mipmap levels i should use. 

Does setting the mip levels to 0 create a full chain or do you have to manually set the number? 

My last question is my scene is rendered in widescreen 16:9 so the texture isnt square will I be able to go as low as 1x1?

 

Thanks in advance

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imoogiBG has the right link to get you started.  This page also confirms about setting the number of levels to 0 for a full mip chain.  The mip chain will extend to 1x1 at the lowest level, even if your dimensions aren't square.

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Related to mipmapping, are there standard rules for rounding the width and height of the mipmap levels of non-power-of-2 textures ? I could not find any information in the DirectX documentation on that and no relevant API method either (only a GetDesc for the texture, not the sub surfaces). In my engine I manually lock and fill the mip levels of some textures but I don't feel too confident about the assumptions I've made regarding the dimension of the locked surfaces.

Thanks.

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The width and height are always halved and integer-truncated (a simple unsigned integer VAL >>= 1), then max’ed with 1 until both the width and height are 1. After that, there are no more mipmaps.


L. Spiro

Nice to know, Thanks!

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the problem is I need to extract the 1x1 mipmap and send the data over to a shader. I can't figure out how to extract the mipmap.

tex2Dlod
Specify the level of the 1×1 mipmap in t.w and sample coordinate [0.5, 0.5] (t.xy = vec2(0.5,0.5);).

Or you can activate only the lowest mipmap when you set the texture.
When calling CreateShaderResourceView(),
Set D3D11_SHADER_RESOURCE_VIEW_DESC::Texture2D::MostDetailedMip to the last mipmap level (D3D11_SHADER_RESOURCE_VIEW_DESC::Texture2D::MipLevels - 1).


L. Spiro Edited by L. Spiro
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the problem is I need to extract the 1x1 mipmap and send the data over to a shader. I can't figure out how to extract the mipmap.

tex2Dlod
Specify the level of the 1×1 mipmap in t.w and sample coordinate [0.5, 0.5] (t.xy = vec2(0.5,0.5);).

Or you can activate only the lowest mipmap when you set the texture.
When calling CreateShaderResourceView(),
Set D3D11_SHADER_RESOURCE_VIEW_DESC::Texture2D::MostDetailedMip to the last mipmap level (D3D11_SHADER_RESOURCE_VIEW_DESC::Texture2D::MipLevels - 1).


L. Spiro

 

Thanks a lot, really appreciated! I will go with the first option :)

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