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--- wiki:development:glx-xlib-workaround [2020/01/23 18:22]
uli42 [Approach]
+++ wiki:development:glx-xlib-workaround [2020/08/20 20:24]
uli42 add helper script with LD_PRELOAD
@@ Line 11: / Line 11: @@
 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.
-Please note: the instructions below are not current anymore since mesa now mainly uses meson for building, athough still offerings scons. Please consult https://mesa3d.org/llvmpipe.html for a description how to compile the required library. Note that those instructions are incomplete as of Mesa 19.3.2, you need to call meson with some further parameters:
+==== Mesa 19 and newer ====
+Please note: the instructions below are valid for older 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/:${LD_LIBRARY_PATH} glxinfo | grep 'GLX version:'
+</code>
+If you want you can copy the libgl-xlib directory to some location of your likes and write a small wrapper "x2goglx" for starting GLX applications:
+<code>
+#!/bin/sh
+LD_LIBRARY_PATH=<your directory>/libgl-xlib:${LD_LIBRARY_PATH} exec "$@"
+</code>
+<code>
+$ chmod u+rx x2goglx
+$ x2goglx glxinfo
+</code>
+Some software modifies LD_LIBRARY_PATH itself. In that case you might be successful with LD_PRELOAD. Instead of setting LD_LIBRARY_PATH point to a directory you set LD_PRELOAD to point to the generated library itself:
+<code>
+#!/bin/sh
+LD_PRELOAD=<your directory>/libgl-xlib/libGL.so exec "$@"
 </code>
@@ Line 68: / Line 100: @@
 ebuild "/usr/portage/media-libs/mesa/mesa-${mesa_version}.ebuild" clean
 </code>
+===== Matlab 2019b =====
+Compile 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 -Dprefix=/usr/local/mesa-20.1.0/
+</code>
+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 ''/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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