[Mesa-dev] [RFC PATCH] mesa: Export BOs in RW mode

Alyssa Rosenzweig alyssa.rosenzweig at collabora.com
Wed Jul 3 16:07:29 UTC 2019

> Since the same discussion is happening with etnaviv: Why exactly does mesa
> need to mmap imported buffers?

The golden question!

Seemingly, (one of the) reasons is that the state tracker does
colourspace conversion in software if the winsys wants a format that the
driver doesn't advertise. Unrelated to this, that's almost certainly a
performance issue and might explain quite a bit...

In this case, the winsys seems to want RGB10_A2 but we settle for RGBA8.
I thought that was just changing EGL negotiation stuff.. I had no idea
it was covering up in software... not good...
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <https://lists.freedesktop.org/archives/mesa-dev/attachments/20190703/9fa2bd7b/attachment.sig>

More information about the mesa-dev mailing list