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glamor: Only log a backtrace above a debug level

Olivier Fourdan requested to merge ofourdan/xserver:glamor-backtrace-debug-level into master

GLAMOR now logs an xorg_backtrace whenever a GL error is raised, to help with debugging issues and identify the root cause of the GL error in the code.

Yet that's meant for debugging, not necessarily something worth enabling all the time.

Add a new debug level for glamor and log the backtraces only when the debug level is set above that value, e.g. GLAMOR_DEBUG=4

Signed-off-by: Olivier Fourdan ofourdan@redhat.com
See-also: #1288 (closed)
Fixes: 3b265c59 - glamor: Dump backtrace on GL error

Edited by Olivier Fourdan

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