For Jinc, you also need madshi's anti-ringing, it sux without it.
Also if someone is going to implement it, it will be cool if needed calculations can be done in GPU. Unless it'll be comparable to spline36 by speed. Cause if it'll be slow, one could just go with nnedi/eedi+subpixel shift(if desired) and get better results. And Jinc is also not something you're going to use for downscale.
It could be way simpler if madshi could just turn that part of his renderer into a plugin (even if closed-source).
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