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[Elima-d <1504387@xxxxxxxxxxxxxxxxxx>]

I just sent for review a piglit test that checks that the combination of
internalFormat=GL_BGRA_EXT, format=GL_BGRA_EXT and type=GL_UNSIGNED_BYTE
is valid on TexImageXD and TexSubImageXD, as specified by the extension
<https://www.khronos.org/registry/gles/extensions/EXT/EXT_texture_format_BGRA8888.txt>:

http://lists.freedesktop.org/archives/piglit/2015-October/017535.html

This should prevent this regression in the future.

However, this test doesn't pass on master because current handling of
GL_BGRA format allows for this invalid combination (which is checked in
the test):

internalFormat=GL_RGBA format=GL_BGRA_EXT and type=GL_UNSIGNED_BYTE

or

internalFormat=GL_BGRA_EXT format=GL_RGBA and type=GL_UNSIGNED_BYTE

So I also sent a patch to mesa-dev that improves this and make the test
pass:

http://lists.freedesktop.org/archives/mesa-dev/2015-October/097211.html

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https://bugs.launchpad.net/bugs/1504387

Title:
  [regression] Software client windows appear all-black on wily desktop

Status in Mesa:
  Confirmed
Status in Mir:
  Invalid
Status in mesa package in Ubuntu:
  Fix Released

Bug description:
  [regression] Software client windows appear all-black, as of today on
  wily desktop.

  Although Mir has not changed. It seems like some other part of the OS
  is broken.

  $ sudo mir_proving_server &
  $ sudo mir_demo_client_progressbar

  The bug appeared in:
  mesa (11.0.2-1ubuntu3) wily; urgency=medium

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