Option to compress in ETC1 mode for speed

[reduz]

As the previos issue (#20) was closed, opening this one with a better explanation of the desired feature.
As far as I understant, ETC2 supports the ETC1 specification subset.

Would it be possible to compress ETC2 textures as ETC1, as in, less quality/modes but having the benefit of alpha support, R and RG formats, etc. so compression speed can be increased in exchange for quality?

Thanks!

[mainroach]

Hi reduz,
Please see the documentation (command line options ) to export an ETC1 file from etc2comp.

Please note, etc2comp is a tool focused on ETC2 compression performance, and ETC1 performance has never been a focus. As such, there may be other tools available which encode ETC1 textures faster.

If you have a scenario where you are willing to trade off texture quality for encoding performance, I suggest testing which libraries and command line options will give you the best tradeoffs for your scenario.