{{{#!div class="box"
[[Image(http://xpra.org/icons/opengl.png)]]
= OpenGL Applications =

You can run [https://www.opengl.org/ OpenGL] applications in an xpra session in a number of ways:
* by running the xpra session directly on a "real" X11 server using an accelerated display driver - this is hard to setup and undocumented: you need to use the {{{xvfb}}} switch to start an accelerated X11 server (modified xorg.conf)
* by [/wiki/ShadowServer shadowing] an existing accelerated X11 server (sub-optimal)
* by using [http://www.virtualgl.org/ VirtualGL]

[[BR]]

This is not related at all to the [/wiki/ClientRendering/OpenGL OpenGL client rendering]: you can connect with any client you want, accelerated or not.
}}}


{{{#!div class="box"
== VirtualGL setup ==

Usually, you can just {{{vglrun}}} your application and things will "just work".
That is the case for simple application like {{{glxgears}}} / {{{glxspheres}}}.

Other applications may require more complicated workarounds, see the extensive [http://svn.code.sf.net/p/virtualgl/code/tags/2.4.1/doc/index.html VirtualGL documentation] for details, in particular [http://svn.code.sf.net/p/virtualgl/code/tags/2.4.1/doc/index.html#hd0012 12: Using VirtualGL with setuid/setgid Executables].

Caveat: for some unknown reason, you may need to use {{{/etc/ld.so.preload}}} instead of {{{LD_PRELOAD}}} to make some suid applications work through xpra. (#898)
Temporary solution:
{{{
$ mv /etc/ld.so.preload /etc/ld.so.preload.saved >& null
$ echo "/usr/lib64/VirtualGL/libdlfaker.so /usr/lib64/VirtualGL/libgefaker.so /usr/lib64/VirtualGL/librrfaker.so" > /etc/ld.so.preload
$ vglrun yourapp
$ rm /etc/ld.so.preload
$ mv /etc/ld.so.preload.saved /etc/ld.so.preload >& null
}}}
If you application is suid, you may also need to chmod it.
}}}

{{{#!div class="box"
== OpenGL Performance ==

Some rough figures and compatibility tests.

Running [http://www.geeks3d.com/gputest/ GpuTest] 0.7.0, on a Fedora 22 system with a [http://www.geforce.com/ GeForce GTX 760], kernel 4.0.5, [http://www.nvidia.com/Download/index.aspx nvidia driver] 346.59 at 1280x720 resolution.

The [http://www.vmware.com/products/player vmplayer] tests below start the same tests in a Windows 7 Ultimate 64-bit virtual machine using VMware Player 7.1.0 build-2496824.


||= Platform =||||||||||||||||=  Test  =||
||= =||||= {{{FurMark}}} =||||= {{{TessMark X8}}} =||||= {{{PixMark JuliaFP32}}} =||||= {{{PixMark Volplosion}}} =||
||= =||= Points =||= FPS =||= Points =||= FPS =||= Points =||= FPS =||= Points =||= FPS =||
||Bare Metal|| 4283|| 71|| 87143|| 1453|| 29994|| 498|| 2969|| 49||
||vglrun|| 3769|| 62|| 8842|| 147|| 10621|| 177|| 2696|| 44||
||vmplayer|| 1736|| 28||||  failed  || 3459|| 57||||  failed  ||
||vglrun vmplayer|| 1774|| 29||||  failed  || 3525|| 58||||  failed  ||
||xpra vglrun vmplayer|| 2494|| 41||||  failed  || 10927|| 181||||  failed  ||
||wine|| 5078|| 84|| 96217|| 1606|| 42552|| 708|| 3585|| 59||
||vglrun wine|| 2891|| 48|| 12170|| 202|| 10667|| 177|| 2741|| 45||
||xpra vglrun wine||||  failed  || 9518|| 158|| 9085|| 151|| 2693|| 44||

Some observations:
* virtualgl adds some overhead which is most noticeable when running on bare metal, hardly noticeable when running through vmplayer as it slows down the opengl performance considerably already.
* running through xpra actually gives a performance boost in some cases, probably because it does not need to wait for the actual screen refresh since there isn't one.
* wine shows high performance, even faster than bare metal, but some tests display with quite a lot of stuttering, the stuttering goes away when running through vgl, but so does most of the performance..

Note: [https://www.virtualbox.org/ VirtualBox] 4.3.x failed to launch any of the tests and is not included here.
}}}