I've worked with many of the authors of this at one time or another:
Building a blazing fast ETC2 compressor
Repo:
https://github.com/google/etc2comp
(I can't believe the Mali encoder was only single threaded!)
Building a blazing fast ETC2 compressor
Repo:
https://github.com/google/etc2comp
(I can't believe the Mali encoder was only single threaded!)