What's the problem with S3TC? There is a separate library for it that works very well with Mesa.
I thought there was recently a posting on the mailing list that said it would be fine as long as it was hidden behind a config switch. Was that shot down privately by others?
It was rather completely ignored by others...
Would it be possible to implement this in the form of external library like libtxc_dxtn?
Yeah, maybe worths a shot?