Buildsystem changes for KWin mobile
kde at martin-graesslin.com
Mon Nov 29 22:10:04 CET 2010
please keep me CC-ed as I am not subscribed. Thanks
As you might know I am currently working on the OpenGL ES port of KWin and
have some build system related questions.
First a short explanation about the general problem: you can either compile
against OpenGL or OpenGL ES, but not both at the same time. ES is only a
subset of OpenGL and due to the various different versions we cannot restrict
on the subset (though I would like to do so). This means it has to be decided
at compile time whether OpenGL or OpenGL ES has to be used.
This would be fine for mobile, but the ES port is also very important for
desktop systems. It will give our users who are able to use ES a much more
modern and hopefully much faster compositing system and it is a hard
requirement for any work on Wayland.
So what I would like to have is: first build kwin with OpenGL, then build kwin
again with other options set for OpenGL ES. Is something like that possible?
KWin has several build targets. There is the effects library which is linked
against either OpenGL or ES. In the ES case symbols are removed and in future
probably some ES specific added. Then there are the effects which link against
this library and would need to be build twice as well, because we cannot
support all effects in ES yet.
Last but not least there is kwin core also linking the effects library and
using complete different code pathes for OpenGL or ES.
So what is the best way to tackle this issue? If you have further questions or
need the current changes to the CMake files, just let me know.
Oh and we need to find OpenGL ES. I use a script from Gluon and extended it to
also find EGL. It would be nice if someone who is competent in this area could
do it properly and maybe add it to kdelibs or better cmake directly. I think
OpenGL ES support will become more of a general need for KDE development in
Thanks in advance for your help.
P.S. There is no code in SVN yet. I am waiting for git.
: I hope Phoronix does not read this mail
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