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--- wiki:development:glx-xlib-workaround [2015/03/07 02:45]
mikedep333 created
+++ wiki:development:glx-xlib-workaround [2020/06/02 19:11]
uli42 [Matlab 2019b]
@@ Line 1: / Line 1: @@
-Workaround for getting GLX 1.4 working.
+====== Workaround for getting GLX 1.4 working ======
-Applications will use libGL.so, which in turn uses the xlib interface to talk to the X server (nxagent) rather than the GLX interface.
+===== Symptoms =====
-From the applications' perspective, they have GLX 1.4.
+  * Gnome-based and other applications report messages like ''"Failed to initialize gtk+: Unable to initialize the Clutter backend: no available drivers found."''
+  * ''glxinfo'' reports GLX Version is 1.2
+  * Disabling GLX entirely in ''/etc/x2go/x2goagent.options'' via ''-extension GLX'' does not work because the application does not have the capability to work without GLX at all.
+===== Approach =====
+Use a wrapper/proxy library provided by Mesa. The applications will use the supplied libGL.so, which in turn uses the lib interface to talk to the X server (nxagent) rather than the GLX interface. From the applications' perspective, they have GLX 1.4.
+==== Mesa 19 and newer ====
+Please note: the instructions below are valid for olter Mesa releases. In Mesa 19 //meson// is recommended for building. Please consult https://mesa3d.org/llvmpipe.html for a basic compilation instruction. Since those instructions will not work out of the box (Error: "gallium-xlib conflicts
+with any dri driver") as of Mesa 19.3.2 you need to call //meson// with some further parameters like this:
+<code>
+$ meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3
+$ ninja
+</code>
+==== Debian Buster and Mesa 19.3.2 ====
+<code>
+$ (download and extract tarball from mesa3d.org)
+$ cd mesa-19.3.2
+$ mkdir build
+$ cd build
+$ meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3
+$ ninja
+$ LD_LIBRARY_PATH=`pwd`/src/gallium/targets/libgl-xlib/:${LD_LIBRARY_PATH} glxinfo | grep 'GLX version:'
+</code>
+If you want you can copy the libgl-xlib directory to some location of your likes and write a small wrapper "x2goglx" for starting GLX applications:
+<code>
+#!/bin/sh
+LD_LIBRARY_PATH=<your directory>/libgl-xlib exec "$@"
+</code>
+<code>
+$ chmod u+rx x2goglx
+$ x2goglx glxinfo
+</code>
+==== Ubuntu 14.04 ====
+(with trusty-updates mesa 10.1.3-0ubuntu0.3)
-Ubuntu 14.04 (with trusty-updates mesa 10.1.3-0ubuntu0.3):
 <code>
 sudo aptitude build-dep mesa
@@ Line 15: / Line 55: @@
 glxinfo | grep 'GLX version:'
 </code>
+==== Gentoo ====
+Ensure that some required tools are installed:
+<code>
+emerge -1av app-portage/gentoolkit dev-util/scons dev-python/mako
+</code>
+Create a place to store the library - adapt this path to your liking.
+<code>
+mkdir -p /usr/local/share/mesa-libgl-xlib
+</code>
+Place the following line in a suitable place - either in your .bashrc or in the script that calls the individual application:
+<code>
+export LD_LIBRARY_PATH=/usr/local/share/mesa-libgl-xlib/:${LD_LIBRARY_PATH}
+</code>
+Configure portage to extract and patch the Mesa package into a known location. Before doing so, ensure that the USE flags for media-libs/mesa are configured to your liking.
+<code>
+mesa_version="$(equery -q list media-libs/mesa -F '$version')"
+ebuild "/usr/portage/media-libs/mesa/mesa-${mesa_version}.ebuild" prepare
+</code>
+Now compile the library and move it over to the storage location:
+<code>
+cd "/var/tmp/portage/media-libs/mesa-${mesa_version}/work/mesa-${mesa_version}"
+scons libgl-xlib
+cp -av build/linux-x86_64-debug/gallium/targets/libgl-xlib/* /usr/local/share/mesa-libgl-xlib/
+</code>
+Cleanup:
+<code>
+ebuild "/usr/portage/media-libs/mesa/mesa-${mesa_version}.ebuild" clean
+</code>
+===== Matlab 2019b =====
+Compile like this:
+```
+meson -D glx=gallium-xlib -D gallium-drivers=swrast -D platforms=x11 -D dri3=false -D dri-drivers="" -D vulkan-drivers="" -D buildtype=release -D optimization=3 -Dprefix=/usr/local/mesa-20.1.0/
+```
+To make Matlab load the new driver modify Matlab's lib search path:
+cp $MATLAB_DIRECTORY/bin/.matlab7rc.sh ~
+Edit the file ~/.matlab7rc.sh, find the glnxa* section and add the path to you mesa library, e.g. /usr/local/mesa-20.1.0/lib/x86_64-linux-gnu, to LDPATH_PREFIX
+Add to your .profile: export MESA_GL_VERSION_OVERRIDE=3.0

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