[gekko]

Wow, so they are trying to hook the calls to the graphics API and render it to a larger viewport? That would be possible, similar to DLL hooking. However, even doing that would either warp the image or you would be restricted to a uniform scale. Not sure how you would adjust the aspect ratio unless you tried to decompose the projection matrix and adjust the aspect ratio.

Regardless, I think you're forgetting that rendering at a different resolution isn't that easy. Well, it is as easy as adjusting the viewport and projection matrices, but you can't just do it automatically to existing games and expect it to work. Changing the resolution can cause many rendering artifacts with shadow mapping and others, as well as completely break any code which may be processing a full-screen texture on the CPU side. Artifacts may be acceptable for an illegal emulator, but I would imagine Nintendo wants to get these games to run as close to the original as possible.

I'm by no means an expert on what's possible to do with emulation, but I can't see this being possible for all cases. I imagine it's a bit easier since the Wii is fixed-function, but it seems way too easy to break.