The reason why I ask is that Qt5 apparently started using libxcb for a lot of its underlying X operations. Unfortunately, since libxcb bypasses Xlib, that creates issues with VirtualGL, since VGL relies on intercepting certain Xlib functions in order to be informed of things like window creation, destruction, and resizing.
I can work around the resize issue easily enough by forcing VirtualGL to treat the xcb windows as "foreign" and to set up a separate event loop to monitor StructureNotify events to those windows. That is a simple matter of introducing a new environment variable, but I fear that there are deeper issues involved and that just getting the cube demo to work is not necessarily going to fix all of the Qt5 issues. I think it may be necessary to interpose on certain key xcb functions in order to do this the "right way." Fortunately, Qt5 does not appear to be using the xcb-glx interface, so that limits me to simply interposing on the window creation/destruction/event queue functions. I have my concerns about this, though. Xlib can be built to use xcb as an underlying transport layer, so if VirtualGL is interposing on both Xlib and xcb and one is calling the other, chaos could ensue. Thus, I would generally only want to enable xcb interposition as a non-default case until enough testing has been done to ensure that it doesn't accidentally cause the untimely eruption of Krakatoa or something. If you could provide some simple demo code that demonstrates the other issue -- the inability to display any 3D content -- that would be helpful. On 7/29/14 12:41 AM, peter.ty...@csiro.au wrote: > An in-house app fails to display any 3D content with VirtualGL since it was > migrated to Qt5 from Qt4. According to the developer no code was changed > other than what was required to migrate the app to the Qt5 namespace. ------------------------------------------------------------------------------ Infragistics Professional Build stunning WinForms apps today! Reboot your WinForms applications with our WinForms controls. Build a bridge from your legacy apps to the future. http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk _______________________________________________ VirtualGL-Users mailing list VirtualGL-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-users
