Realtime texture upscaling?

Is it possible?
To apply xBRZ, Bicubic, MMPX upscaling to the textures, instead of frames? Somehow, the PPSSPP emulator can do it, I don't know if it dumps the textures internally and upscale them or anything like that.
Also, would it be possible to apply FidelityFX Super Resolution 1.0 to textures instead of frames too?

Looks like it all started with the idea of a better filtering for textures, instead of linear filtering:
Use other Filtering than Linear Filtering? · Issue #1468 · hrydgard/ppsspp · GitHub

This thread has the whole concept, up to the implementation, on PPSSPP.

Only a sharpening filter is similar to upscaling, but not every sharpening filter gives upscaling results. For example Glamarye Fast Effects by rj200 at 1.0 sharpness gives great results, it looks like you play not at 1080 resolution but at 2k or 4k. It all depends on the game, of course, but the result is often impressive.

Yea, some sharpening shaders do give the impression of upscaled textures (when viewed from far). I use a combination of LocalContrastCS (awesome upscaling feeling) and iMMERSE Sharpening (another awesome sharper). Works great.