Tropical Freeze Textures: the TXTR format. RTB and Parax pretty much figured it out.

[Parax]

Awesome. Updated the wiki page with your info.

Do we know how the swizzling actually works (and how the swizzle value affects it)? That's what I kept getting stuck on last time I tried decoding these myself. The GC/Wii swizzles are relatively simple, but the Wii U ones seem to just be amazingly complicated. Either that or I just completely don't understand it.