https://bugs.freedesktop.org/show_bug.cgi?id=42131
Bug #: 42131 Summary: Problem with resizing OpenGL windows when using XCB Classification: Unclassified Product: Mesa Version: 7.11 Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/r600 AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: nilschrbrause@googlemail.com
Created attachment 52651 --> https://bugs.freedesktop.org/attachment.cgi?id=52651 Test program demonstrating the problem
The attached program creates a window using XCB and draws a rectangle inside it using OpenGL. When using indirect software rendering (LIBGL_ALWAYS_INDIRECT=1), everything works as expected. But when using the R600 Gallium3D driver, the OpenGL view port doesn't seem to get resized properly and the window contents get screwed up.
https://bugs.freedesktop.org/show_bug.cgi?id=42131
--- Comment #1 from ikrabbe.ask@gmail.com 2012-01-03 07:05:34 PST --- I can confirm this bug. It seems that there are some internal events, forwarded to the DRI(2) module that get lost, as xcb doesn't use XEvents. That's why it works, when you use the Xlib Event Loop { if (XPending(D)) XNextEvent(D,&E); } with XSetEventQueueOwner(Xlib...);
When you use the xcb event loop mechanism, mesa does not detect the events, that need to be reacted on by the DRI module.
So after all, this problem has to be solved within mesa, not within xcb. Obviously there where some experiments that care about xcb and mesa, but I haven't found a good development branch yet.
What I do about this problem now is to create a glXCreateWindow (overlay) at full screen size and render my scene into the visible part of the window, by translation and scaling.
https://bugs.freedesktop.org/show_bug.cgi?id=42131
Alex Deucher agd5f@yahoo.com changed:
What |Removed |Added ---------------------------------------------------------------------------- AssignedTo|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop. |.org |org Component|Drivers/Gallium/r600 |Mesa core
dri-devel@lists.freedesktop.org
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