[Mesa-dev] [Bug 109816] glGenerateMipmap makes deepest level far from average texel value for NPOT textures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109816

--- Comment #3 from Roland Scheidegger <sroland at vmware.com> ---
(In reply to Ruslan Kabatsayev from comment #2)
> (In reply to Roland Scheidegger from comment #1)
> > I have no idea though what kind of filter nvidia uses (and I would not be
> > surprised if other non-mesa blob drivers also simply use bilinear filtering).
> 
> I think they use something like they describe in their paper
> "Non-Power-of-Two Mipmapping":
> 
> http://download.nvidia.com/developer/Papers/2005/NP2_Mipmapping/
> NP2_Mipmap_Creation.pdf

Ah yes that would make sense (although I highly doubt you'd want to do the
two-pass approach with the hw of today...). So I guess nvidia is using this
approach since ages, interesting. All the apis kind of seemed to have ignored
the issues with the box filter with npot textures.

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