Nouveau - Sep 2016 - [Bug 97568] New: read pixels of MSAAx8 surface stretched horizontally/vertically

https://bugs.freedesktop.org/show_bug.cgi?id=97568

            Bug ID: 97568
           Summary: read pixels of MSAAx8 surface stretched
                    horizontally/vertically
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: timothy.o.rowley at intel.com
        QA Contact: nouveau at lists.freedesktop.org

vtk ctest has many failures which appear to be caused by its selection of a
MSAA visual and a missing resolve on the read pixels - the image it gets is
stretched 4x horizontally and 2x vertically.

https://open.cdash.org/viewTest.php?onlyfailed&buildid=4530390

Tested with ubuntu-16.04 nouveau driver and a GeForce GTX 750 Ti (GM107).

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https://bugs.freedesktop.org/show_bug.cgi?id=97568

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
As I mentioned on IRC, I strongly believe this is due to the following issue:

https://trello.com/c/jzBpfrzL/134-resolve-on-transfer-map-upscale-on-transfer-unmap

Basically we're supposed to do a resolve on transfer_map, return the
resolved
image, and if any of it is changed, copy back at unmap time while up-scaling.

We do none of that right now, and 8x MSAA is laid out in a 4x2 grid for each
pixel, so it makes sense that the output would be "scaled up" that
way.

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https://bugs.freedesktop.org/show_bug.cgi?id=97568

GitLab Migration User <gitlab-migration at fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #2 from GitLab Migration User <gitlab-migration at
fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1111.

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