Hi, i need realize software anisotropic filtering, help please, where i can find: theory, algorithms ? On wiki not useful information, thank.
Anisotropic filtering
I just found some with a quick search:
http://geometrian.com/data/research/atf/AnisotropicTextureFiltering.pdf
http://onversity.com/doc/article/filtre-spaf.pdf
http://www.mpi-inf.mpg.de/~khildebr/papers/smooth.pdf
I'm sure there are many, many... many different implementation of AF, so take them just as example..
Author
thank 
and, possible example realisation software ?
or more simple example, and i need software implementation, and not hardware.
Author
I understand it uses a sample on an ellipse rather than a circle (like the square with bilinear filtering), but I do not understand how to calculate this ellipse, please tell me.
I understand that the major and minor radius of the ellipse depend on the inclination of the plane of the screen space, so you can use a vector along which to interpolate texels (x2 -> 2 texel x4 -> 4 texel ...)?
Here another elliptical-like implementation (well documented imo): http://ronaldperry.org/FelineSig1999.pdf and another here: http://graphics.cs.aueb.gr/graphics/docs/papers/I3D11_EllipticalFiltering_draft.pdf
Here is a recursive implementation: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.106.5735&rep=rep1&type=pdf
If you still have issues with the AF filtering it's better you ask into Graphics Programming and Theory forum.
Author
What can you say about EWA filter, whether it is good for the software implementation ?
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