[Development] Dynamic OpenGL option on Linux?

Lisandro Damián Nicanor Pérez Meyer perezmeyer at gmail.com
Fri Nov 30 00:31:34 CET 2018

El jueves, 29 de noviembre de 2018 17:26:21 -03 Dmitry Shachnev escribió:
> Hi all,
> I filed https://bugreports.qt.io/browse/QTBUG-72128 today, but some people
> suggested that it’s better to discuss this on the mailing list first.

Me between them.

> In Debian we are having a long discussion [1] on whether to build Qt with
> ‘-opengl desktop’ or ‘-opengl es2’ on ARM64 (aarch64) and some other
> architectures.
> There are users who want the desktop implementation (for desktops and some
> boards), and there are users who want the OpenGL ES implementation (for
> mobile devices and other boards).
> We are currently considering shipping two (conflicting) sets of Qt
> libraries, but that is a hacky and not ideal solution. It would be much
> better if Qt had an option to select OpenGL version at runtime (via dlopen
> or some other mechanism), similar to what is provided on Windows with
> ‘-opengl dynamic’ option [2].
> Is there a chance to have such an option? It would allow Linux distributions
> to offer best-in-class support for both mobile- and desktop-class
> computers.
> Maybe I will be happy to help with implementing this if someone tells me
> that it is possible and what will need to be done in the code to allow it.

I am also willing to put time into this if you guide us.

Please note that we are not wanting to do runtime "auto detection", but rather 
an environment variable or alike, probably using Desktop OpenGL as default.

This would indeed become a game changer for Qt on embedded devices trough 
binary distributions, no matter which one.

If I remember correctly some proprietary GLES support was needed in some 
cases. It is worth to note that we do not target this cases, just gles as 
provided by mesa. Vendors can later interface with mesa or provide an 
alternative library like nvidia already does (but better if they interface 
with mesa).

Of course if a change like this also help improve this other cases, the 

porque no respeta el orden natural en el que se leen las cosas
>¿por qué top-posting es tan molesto?
>>>¿cuál es la peor molestia en los emails de respuesta?

Lisandro Damián Nicanor Pérez Meyer
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