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radv: Triangle compression

Konstantin Seurer requested to merge KonstantinSeurer/mesa:radv-triangle-compression into main

Before:

Averages over all ASs:
   247349 bytes/ 241.552 KiB
Total results:
   647560960 bytes/ 617.562 MiB

After:

Averages over all ASs:
   225373 bytes/ 220.091 KiB
Total results:
   590026944 bytes/ 562.694 MiB

The savings don't look too impressive since the current version only compresses if it can improve BVH quality (by reducing the internal node count). Further improvements that allow compression more often are planned.

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