999c2aed88
Somewhat terrifyingly, we never sent this for direct contexts, which means the server never knew the context/drawable bindings. To handle this sanely, pull the request code up out of the indirect backend, and rewrite the context switch path to call it as appropriate. This attempts to preserve the existing behavior of not calling unbind() on the context if its refcount would not drop to zero. Of course, you can't just do this indiscriminately, because this is GLX and extant X servers have bugs and everything is terrible. To wit: - For 1.20.x prior to 1.20.6, you can bind a direct context once, but the second time you try to modify the context's binding you will get GLXBadContextTag. This includes unbinding the context. And "deleting" the context will leak memory, because it will still appear to be current. - For 1.19 and earlier, glXMakeCurrent(dpy, None, ctx) should be legal for GL 3.0+ contexts, but the server will throw BadMatch. To guard against this, we only send the request for indirect contexts unless the server is known good, and only mention one context at a time in such a request; if switching between contexts, we first unbind the old, and then bind the new. Note that the second VendorRelease() version is to catch XFree86 4.x and Xorg [67].x, which almost certainly have the above bugs. Other servers might report different version numbers here, but we can't do direct rendering against them, so this should be safe. Fixes glx-make-context, glx-multi-window-single-context and glx-query-drawable-glx_fbconfig_id-window. Sufficiently old piglit will regress on glx-make-glxdrawable-current (throwing BadMatch), which is fixed by mesa/piglit!116.
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.net#dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.