As of 2012-11-09 this patch has been integrated into the main upstream Minetest repository.Over on
this forum thead, several of us discussed working some extra graphics settings into the game.
Here then is a patch I've devised that allows you to turn on Mipmap, Anisotropic Filtering, and Bi-/TriLinear filtering via a few checkboxes that have been added to the "Settings" menu, or by editing your minetest.conf if you prefer. This patch is in "unified diff" format and was made against a fresh 0.4.3 source tree from git (commit hash 25cf3757b2[...] at the time):
(obsolete links deleted)
Either apply the aforementioned patch and recompile, or download and install one of the above builds, according to your platform and your needs. Then start the program, go to the "Settings" tab in the main menu, and change one or more of the new checkboxes on the right. Or, you can directly edit your minetest.conf and add one or more of the following lines:
mip_map = 1
anisotropic_filter = 1
bilinear_filter = 1
trilinear_filter = 1
Under normal circumstances, you'll want to set Anisotropic Filtering and Mip-Map at the same time (either both on or both off). The Bi-/Trilinear settings are mutually exclusive. If you set both, trilinear mode takes precedence.
Many thanks to sfan5 for helping me get the patch into a format everyone can actually use and for providing the above Windows build, and to RealBadAngel and to a certain individual who wishes not to be named, for helping me understand what I'm doing. :-)
Repository for my fork:
(obsolete link deleted)
Note that depending on the build you chose above (if any), you may also need to grab the latest version of celeron55's minetest_game repository, which supplies the actual content we're all accustomed to. Get it here: (obsolete link deleted)
Enjoy!