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