Can Wii library update HD through patches?

[kanageddaamen]

Depends entirely on how the backward compatibility is implemented.

If Cafe has Wii hardware built in, similar to how the Wii handles GC backcomp, then it is pretty much a solid no. It would be the same as running the software on the wii itself.

However, if Cafe emulates the wii hardware, then it would be simple to upscale, and here is why:

Each frame that is displayed is constructed using the geometry of the scene. The geometry doesn't care what the resolution is. The rendering process converts the geometrical/texture/shader/etc data into a 2D array of pixels. So if the Cafe is handeling the render process through Cafe hardware, then it can just render the data at a higher resolution (even throwing in other effects like Antialiasing)

Textures would probably be pretty muddy though because they were not made with higher resolutions in mind.