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  1. ASTC was announced with iirc OpenGL 4.3, but...

    ASTC was announced with iirc OpenGL 4.3, but didn't became part of the profile nor did it in 4.4. It still is an extension, neither is it implemented in any desktop driver. So atm there is no ASTC....
  2. How are ASTC or ETC1/2 replacements for S3TC? ...

    How are ASTC or ETC1/2 replacements for S3TC?

    ETC is implemented in software for all desktop drivers atm (and it is very unlikely MESA impl. them in hw before the blob ones do)
    ASTC isn't...
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    Not to forget that none current driver implements...

    Not to forget that none current driver implements it in hw afaik. Mesa supports it, but I don't assume any gallium driver implements it. And if I want to compress my textures on hdd and uncompress...
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    FXT1 fails horribly at gradients, we don't need...

    FXT1 fails horribly at gradients, we don't need something worse than S3TC, we need something better.
    BC-6 & BC-7 are good candidates, but their implementation is very complex, so there is just MS's...
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    We use index maps for further compressing our DXT...

    We use index maps for further compressing our DXT already since ~2005 (Doug's patent was filed 2010!) in our open-source project, and I assume many projects did so before us - such an index map is a...
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