Hi All, A bug that has been niggling me for quite some time now is that under the last few rev's of X11 window managers under linux that toggling of fullscreen on/off has been broken. The problem appears when you one a window fullscreen and then try to toggle off full screen, for instance run "osgviewer cow.osg" and the press 'f', what you see if a fullscreen app with no window decoration becoming a smaller window with normal window decoration - instead you just see a quick frame of rendering with a smaller viewport before the window manager jumps back in a resizes the window fullscreen again.
Frustratingly the OSG's GraphicsWindowX11.cpp has actually being tell the X11 window to move to a small size and toggle on the window decoration, but the window manager jumps in a resizes the window/adjusts the window decoration back to full screen. The way you can see that it's the window manager taking control is to switch off this control via enabling the Traits::overrideRedirect - here the X11 window just does what you tell it do, be that full screen or a small window, there is a but though - switching off the window managers control also switch off all the window decoration that the window manager adds so it's not a real solution, just a good illustration of the issue. Over the weekend I looked into the issue and did lots of different experiements to find out what was going on and finally believe I've got the bottom of it, hence the above high level explanation, I have also now come up with a workaround albeit a bit hacky. The workaround happens only when we only a window fullscreen initially, but when we are opening up a full screen window we reate the X11 window at a smaller size than fullsize - this gives the window manager a non full screen size to work with, and then subsequent calls to set the window decoration tell the window manager that the window is actually full screen so it then jumps in a changes the window size to full screen automatically. You never see the smaller window size appear on screen, it just appears full screen so you are never aware of this workaround. Finally when you do toggle off fullscreen the window manager has a previous non full screen sized window to refer to and happily resizes it and then allows the OSG's X11 window resize/position calls to work as intended. It's realize the workaround is a bit goofy but works reliably on my KDE 4.6 system - so for the first time in a couple of years full screen toggling is working as nature intended which is a great relief. However, I do relize that this is just one window manager so this workaround needs testing far more widely. I have added code to detect the new X11 atoms used by modern X11 window managers and only use the workaround when these are available so these changes shouldn't affect older X11 systems. However, this all needs testing. I will install Gnome on one of my systems today to check it works. I can't test older X11 system though - such as IRIX, Solaris, HP-Ux, FreeBSD etc. Could members of the community check out OSG svn/trunk and let me know how things work out. If the testing goes well I will merge this workaround into the OpenSceneGraph-3.0 branch so it'll be part of the 3.0.0-rc2. Thanks in advance for you help testing, Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
