GLES again

[Sebastian Kügler]

Hey,

On Tuesday, August 16, 2011 06:35:40 Martin Gräßlin wrote:
> On Monday 15 August 2011 23:35:35 Sebastian Kügler wrote:
> > I've been poking at running kwin using OpenGL-ES again, and made some
> > progress  there. I now have Mesa builds that provide the needed GLES
> > libraries, thanks to help from Martin with configuring it. It builds and
> > runs fine on my laptop (Mesa package, kde-workspace from the 4.7 branch.
> > CMake finds OpenGL-ES and says that it's building the mobile version of
> > kwin. Kwin starts, and apparently works, I notice no major difference.
> > So far so good. Building the package, however throws me a linker error
> > when linking kwin against libgbm.
> >
> > I've two problems left:
> > 
> > - Is it really using GLES?
> >
> > When starting KWin, it outputs:
> > kwin(24933) KWin::CompositingPrefs::detect: glx version is  1 . 4
> > OpenGL vendor string:                   Tungsten Graphics, Inc
> > OpenGL renderer string:                 Mesa DRI Intel(R) Ironlake
> > Mobile  OpenGL version string:                  2.1 Mesa 7.11-rc3
> > OpenGL shading language version string: 1.20
> > Driver:                                 Intel
> > GPU class:                              i965
> > OpenGL version:                         2.1
> > GLSL version:                           1.20
> > Mesa version:                           7.11
> > X server version:                       1.9.3
> > Linux kernel version:                   3.0
> > Direct rendering:                       yes
> > Requires strict binding:                yes
> > GLSL shaders:                           yes
> > Texture NPOT support:                   yes
> >
> > This looks like it's using the desktop GLX, or does it?
> 
> This is GLX as it says in first debug output. If you are using master try
> kwin_gles binary.

Ok, this is 4.7, I'll try master.

> > - Linker problem during package build:
> >
> > /usr/lib/libgbm.so.1: undefined reference to `gbm_dri_backend'
> > collect2: ld returned 1 exit status
> > make[2]: *** [kwin/kwin] Error 1
> 
> Strange, I do not link at this at all.
> martin at martin-desktop:~$ ldd /opt/kde/bin/kwin_gles | grep gbm
> martin at martin-desktop:~$ 
> 
> > This works when building from source, but not during packages. (Source is
> > the  same, I've packaged the code from the same git clone I've built
> > locally.) I'm quite puzzled here, maybe someone has a pointer where to
> > start looking?
> 
> I think the gbm is used by mesa. Can you try building Mesa without it?

I haven't found an option to get rid of it in Mesa, but someone who had a 
similar problem with the linking. I've tried updating to master, but got into 
dependency hell which I've not left behind me yet.

THanks for the input,
-- 
sebas

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