https://bugs.documentfoundation.org/show_bug.cgi?id=94252
Bug ID: 94252
Summary: Gratuitous GL context switching.
Product: LibreOffice
Version: 5.0.2.1 rc
Hardware: Other
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: michael.me...@collabora.com
Switching OpenGLContext's is an expensive hobby and implies a glFlush (I think)
-which tends to show the partial construction of what we're rendering before
its ready (ie. creates flicker).
Currently we tend to re-use the OGL context that was previously associated with
a VirtualDevice's SalGraphics; however since we un-bind our framebuffers from
that each time we clearCurrent - then if we have a new context - we shouldn't
try to restore the old context if we have another in-place, but instead just
jump on the new context.
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