https://bugs.freedesktop.org/show_bug.cgi?id=94280
Bug ID: 94280
Summary: Regression related to mesa/readpix
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
It appears there was a regression related to recent changes in mesa/readpix. It
could be that the changes exposed something bad in our code, but it works
everywhere else so ...
Specifically it happened with
Last week this test started failing on hythloth's nightly Mesa builds
(along with a few other tests):
* OpenGL2: https://open.cdash.org/viewTest.php?onlyfailed&buildid=4229706
https://open.cdash.org/testDetails.php?test=418931875&build=4229706
* OpenGL1: https://open.cdash.org/viewTest.php?onlyfailed&buildid=4230126
https://open.cdash.org/testDetails.php?test=418952240&build=4230126
For now I've checked out a mesa that still works and stopped updating.
The problem bisects to:
mesa/readpix: Clip ReadPixels() area to the ReadBuffer's
https://cgit.freedesktop.org/mesa/mesa/commit/?id=605832736a6d9427ad894d403cceeb74a5b18dc1
and still occurs after some related follow-up changes to Mesa:
mesa/readpix: Don't clip in _mesa_readpixels()
https://cgit.freedesktop.org/mesa/mesa/commit/?id=b89a8a15c240418d1859947b5114993ecdf424fb
mesa/readpix: Dedent former _mesa_readpixels() if block
https://cgit.freedesktop.org/mesa/mesa/commit/?id=c624241ef47c3a6ea2d1177969328bd4547e45a2
Valgrind reports that vtkImageDifference encounters uninitialized memory
after the change to Mesa but not before. That looks consistent with the
messy corner of the test image seen in the above links. Mesa is no longer
populating the full image with data.
I'll post an apitrace file run with an old mesa that hopefully will show the
problem for you should you not want to build VTK yourself.
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