It has a frontend hardware shim that looks like VI to the Wii software, and behind the scenes it translates those registers to the Radeon’s, including upscaling configuration. The DMCU is a 68HC11 compatible 8-bit CPU whose sole purpose is to perform VI emulation. But where does this emulation software run? Sneaky: they added a special microcontroller to the Latte just for this purpose. Huh? How does that work? Turns out they’re emulating that in software and translating its configuration to the R7xx’s CRTC registers. You may have noticed that good old VI (the display controller / Video Interface of ye olde GameCube and Wii) is gone. But if the RGB is derived from the bugged YCbCr then I don't suppose it would work. I think the issue might be better solved by patching vWii to output RGB instead of YCbCr, as this appears to be an issue with the CbCr channels having the wrong alignment. I'm not confident the Skyward Sword trick will work for all games, however I will test a bunch of games and see how well it sticks between games and reboots, or whether vWii needs to be hard reset every time. Still, 2 is a lot better than 1, and depending on your TV's processor it may be smoothing it out to an acceptable degree since the error is only about 1px (this kind of thing can happen anyway if your TV's processor downsamples chroma to 4:2:2 internally). Skyward Sword trick appears to result in 2, and my original Wii console does not have this. Red bleeding to the right by ~1px and no green edge on left Red bleeding to the right by ~2px and a 1px green edge on the leftĢ. It seems there are 2 bugged chroma modes on vWii:ġ.
However, even with the Skyward Sword fix in effect, the chroma still isn't 100% correct. And ULGX's GUI shows the fix is still in effect (using the cyan circle outlines and some gamecover art to check).
it has a red circle with a black outline). On the other hand, Homebrew Launcher's GUI shows the Skyward Sword fix is still in effect (I'm using Snes9x's icon.png to judge. This does not give me confidence that it would work for all games. I am able to replicate the Skyward Sword fix, and I am launching it from ULGX.īut after exiting the game, vWii sysmenu becomes afflicted with the chroma bug (prior to launching Skyward Sword it was not afflicted).
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