Hi mesa-dev, Working through a current server-side OpenGL rendering project, our team is running into hurdles with regard to anisotropic filtering. Aniso is a hard dependency for our rendering needs, but softpipe/swrast (which support aniso) are too slow performance-wise. Llvmpipe doesn't currently support anisotropic filtering, as far as I can tell.
So, we are using GPU hardware in production, which is costly and not as portable or repeatable as a software-based renderer might be. My question: what are the hurdles to implementing anisotropic filtering in llvmpipe? Has there been any recent discussion about it? I found these implementations for swrast and softpipe by Andreas Faenger in 2011: - swrast: https://lists.freedesktop.org/archives/mesa-commit/2011-May/030692.html - softpipe: https://lists.freedesktop.org/archives/mesa-commit/2011-June/030966.html GitHub mirrors for readability: - swrast: https://github.com/freedreno/mesa/commit/8a98aabe0bcea42cfdc982001ae4876e3d9b1214 - https://github.com/freedreno/mesa/commit/f4537f99cc83cb8133f66dc97c613e95dc0fe162 Could Andreas's implementation be ported to llvmpipe in a relatively straightforward manner, or are there performance considerations in llvmpipe that make that algorithm less than ideal? Maybe some shortcuts similar to hardware implementations? I've considered potentially garnering internal support to sponsor the development financially and would also be curious if that would be welcomed by the project (if I can get support)... and if so, if there would be any individual who would be best suited to handle the implementation. -- *Alan Thomas* Senior Manager, Engineering minted. http://www.minted.com/ 747 Front Street, Suite 200, San Francisco, CA 94111
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