Anisotropic mipmaps are another sort of midway point between mipmapping and EWA described here. It handles the case of axis-aligned rectangular filter regions but not diagonally-aligned filter regions by precomputing averaged versions of the texture with different window sizes on each dimension. It turns out that there's also a pretty way of tiling this within a square, which is pretty cool.
Anisotropic mipmaps are another sort of midway point between mipmapping and EWA described here. It handles the case of axis-aligned rectangular filter regions but not diagonally-aligned filter regions by precomputing averaged versions of the texture with different window sizes on each dimension. It turns out that there's also a pretty way of tiling this within a square, which is pretty cool.
https://en.wikipedia.org/wiki/Anisotropic_filtering#An_improvement_on_isotropic_MIP_mapping