From mesa3d-users  Sat Dec 12 15:14:02 2020
From: Andreas Cord-Landwehr <cordlandwehr () kde ! org>
Date: Sat, 12 Dec 2020 15:14:02 +0000
To: mesa3d-users
Subject: [Mesa-users] EGL Address spaces and Multiple Displays
Message-Id: <2265485.ElGaqSPkdT () weatherwax>
X-MARC-Message: https://marc.info/?l=mesa3d-users&m=160778605407168

Hi, I am currently looking into driver crashes (https://bugreports.qt.io/
browse/QTBUG-87597) when using the QtWayland compositor and rendering on two 
screens via two EGL fullscreen windows. One of the driver, where I see the 
problems, is the i915 via Mesa.

Since the crashes only occur when the QtWayland compositor renders with 
multiple render loops, I assume that there is something wrong with how 
resources are managed between the render threads. While digging into it, I 
came to Section 2.3 of the EGL 1.5 spec, which states, "EGL objects and 
related context state cannot be used outside of the address space in which 
they are created". So, my question is: From the Mesa / driver perspective, do 
I have to consider displays as different address spaces or can I share 
resources like textures between them?

I hope that I sent to the correct mailing list and would be very glad if I 
could get a short answer how this section is meant.

Cheers,
Andreas


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