A function that is like Anisotropic Filtering is what I mean or perhaps texture scaling? I don't know anything about shaders or what shaders can do so I don't know if I'm asking something that is impossible.
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Changing texture filtering is possible (but harder these days than for older titles), yeah. But it requires to go even deeper into the game. It's nothing that can be changed via shaders, it's something you have to modify in the 3D API directly. While it may be something for the future, it's nothing ReShade is currently capable of doing without some bigger rework =)