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The goal here is mainly to check if it's feasible to do with minimal effort. The previous responses indicate that Mofu thinks he has to load images at their original resolution, or that upscaling or downscaling have significant performance costs.
I don't really care if any of these gets implemented, but I don't like seeing discussions based on incomplete or incorrect information.
If someone really needs to play it on their 4k tv, that person should probably just use fsr and live with the artifacts.
FSR is an upscaling solution that can give better quality and sharpness than naive nearest neighbor. That's the whole point. This doesn't require extracting game files because it is fast enough to operate live and can operate on screenshots.
It is not exclusive to applications where performance needs to be increased, otherwise people would just use nearest neighbor.
I'm saying this as something people who complain about blur should try, because the sharpening filter can help with that a bit.
You're confusing different FSR implementations.
FSR 2.0 is a temporal upscaler that also uses movement information,
FSR 1.0 is a pure spacial upscaler.
Also your initial statement about not being allowed to modify game files is demonstrably false. There's a comment by mofu telling someone to modify the translation.
There's also no legal basis for it.
You probably meant that people are not allowed to distribute modified game files, which a separate issue.
The waifu2x upscale is done btw.
I will not upload it, don't worry.
I haven't bothered to look into repacking, just wanted to demonstrate that it can be done fairly easily.
If someone here wants to see the quality change they can take a screenshot and run that through the waifu2x website; for getting an idea of the quality of the upscale that's good enough.