Bug 92946 - [softpipe] piglit fcc-front-buffer-distraction regression
Summary: [softpipe] piglit fcc-front-buffer-distraction regression
Status: NEW
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/softpipe (show other bugs)
Version: 11.1
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: mesa-dev
QA Contact: mesa-dev
Keywords: bisected, regression
Depends on:
Reported: 2015-11-14 00:38 UTC by Vinson Lee
Modified: 2018-04-13 10:18 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Note You need to log in before you can comment on or make changes to this bug.
Description Vinson Lee 2015-11-14 00:38:07 UTC
mesa: 3694d58e6c4a39bd84e8aef0d8e67c3ae9447f33 (maser 11.1.0-devel)

$ ./bin/fcc-front-buffer-distraction -auto
Probe color at (0,0)
  Expected: 1.000000 0.000000 0.000000 1.000000
  Observed: 1.000000 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }

2b676570960277d47477822ffeccc672613f9142 is the first bad commit
commit 2b676570960277d47477822ffeccc672613f9142
Author: Dave Airlie <airlied@redhat.com>
Date:   Fri Oct 9 01:38:08 2015 +0100

    gallium/swrast: fix front buffer blitting. (v2)
    So I've known this was broken before, cogl has a workaround
    for it from what I know, but with the gallium based swrast
    drivers BlitFramebuffer from back to front or vice-versa
    was pretty broken.
    The legacy swrast driver tracks when a front buffer is used
    and does the get/put images when it is mapped/unmapped,
    so this patch attempts to add the same functionality to the
    gallium drivers.
    It creates a new context interface to denote when a front
    buffer is being created, and passes a private pointer to it,
    this pointer is then used to decide on map/unmap if the
    contents should be updated from the real frontbuffer using
    get/put image.
    This is primarily to make gtk's gl code work, the only
    thing I've tested so far is the glarea test from
    v2: bump extension version,
    check extension version before calling get image. (Ian)
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91930
    Cc: <mesa-stable@lists.freedesktop.org>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 1726a5f7f01d9ae1fc76de431bb24cce16cf69ee 75f18ded95766bac58d0c37c96ffa071a4a32071 M	include
:040000 040000 ee333146b90c837460ceab252445e3b38fc528d5 dc0656326c3fb9750fda1f6d3e75aeed99003bc6 M	src
bisect run success
Comment 1 Vinson Lee 2016-03-22 02:19:44 UTC
mesa: 1e8435ce0cce671024ebf9c5465ea8bdcb563b69 (master 11.3.0-devel)

This regression is still present.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.