Created attachment 113450 [details]
Weston shows graphical corruption when run as regular user. Looks like old framebuffer data is getting reused (i.e. partial text and images from firefox or the desktop). Tested inside X and on console with weston-launch. Running as root shows no corruption. Bisected to mesa commit below:
Mesa 10.6.0-devel (git-3f1e128)
Author: Park, Jeongmin <email@example.com>
Date: Sat Feb 7 17:53:48 2015 +0900
st/dri: Make depth buffer optional for postprocessing
Since only pp_jimenezmlaa uses depth buffer, we can make it optional.
Signed-off-by: Marek Olšák <firstname.lastname@example.org>
Created attachment 113451 [details]
dmesg and weston output
Have you enabled any of pp_celshade / pp_jimenezmlaa / pp_jimenezmlaa_color / pp_nored / pp_nogreen / pp_noblue in /etc/drirc or ~/.drirc or the environment?
Yes, both pp_jimenezmlaa and pp_jimenezmlaa_color were set to 8. Changing pp_jimenezmlaa to zero or setting "always_have_depth_buffer=true" seems to fix the problem. Would that mean this is a bug in weston instead? Something along the lines of failing to check that a depth buffer exists before using it?
Sounds like maybe pp_jimenezmlaa gets enabled even when there's no depth buffer.
Do you really want to use those post-processing effects with weston, though? :)
I moved depth buffer checks from dri*.c to pp_jimenezmlaa() per Brian's comment
depth buffer check was added to pp_mlaa.c in 2e6ba6afdb62e80689b844c7267272d261db172c
and removed from dri*.c in 0467a52dc3f7d51eeb51179ce2f9871758ecacb1
This bug seems to be caused by my patch didn't check if pp_jimenezmlaa() was failed.
In pp_run.c, if there are multiple postprocess stages(ppq->n_filters > 1)
so that it requires a temp buffer(ppq->tmp), and pp_jimenzmlaa return
immediately without writing to 'out', then the temp buffer would have old data.
@Michel - well, perhaps not... :)
@Park, Jeongmin - Thanks for taking the time to dig into this. I realize this bug is probably a low priority itme, but if you do find time to add a check for the failure condition it would be appreciated.
The following patch is part of mesa since 10.5.7. Feel free to reopen if it doesn't resolve the issue.
Author: Marek Olšák <email@example.com>
Date: Tue May 26 19:32:36 2015 +0200
st/dri: fix postprocessing crash when there's no depth buffer
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