Regarding Wii's GPU, all I've ever found regarding shaders were that the GPU has 16 shader pipelines, but has a fixed-function design, so you can't just program your own shaders and plug-them to the GPU.
Trying to find that page I read, Google not turning much up atm aside from "he says she says" blogs/editorials.
Trying to find that page I read, Google not turning much up atm aside from "he says she says" blogs/editorials.