[Mesa-maintainers] Recommendations for building Mesa with LIBGLVND support

[Stefan Dirsch]

On Thu, May 11, 2017 at 11:44:09AM +0100, Emil Velikov wrote:
> On 11 May 2017 at 09:24, Timo Aaltonen <tjaalton at ubuntu.com> wrote:
> > On 17.04.2017 21:31, Emil Velikov wrote:
> >> On 23 March 2017 at 15:00, Stefan Dirsch <sndirsch at suse.de> wrote:
> >>> On Tue, Mar 21, 2017 at 12:16:48PM -0600, Kyle Brenneman wrote:
> >>>> Ah, I'd forgotten to address libGLES* in my EGL patch.
> >>>>
> >>>> As far as I can tell, the libGLES libraries in Mesa are just dispatch stubs,
> >>>> and nothing within Mesa depends on them. That is, if an application looked
> >>>> up every GLES function using eglGetProcAddress, then you could remove the
> >>>> libGLES*.so libraries entirely and it would still run fine.
> >>>>
> >>>> If that's true, then a libglvnd-based build of Mesa could just skip building
> >>>> the libGLES*.so libraries, because libglvnd basically does look up every
> >>>> GLES function through the vendor library's eglGetProcAddress.
> >>>
> >>> Thanks, Kyle! This explains a lot! I have done this now (removed Mesa's GLES
> >>> libs and reqplaced them with RPM requires to libglvnd's GLES libs; the same as
> >>> Fedora is doing) and it just works. :-)
> >>>
> >> In case you've missed it - I've pulled Kyle's work [with a small bit
> >> of polish] for Mesa 17.1.0-rc1.
> >>
> >> Note that there's still loose ends - the biggest one in the GLVND
> >> library itself. I've got some local WIP that I'll try to test and
> >> upstream this week.
> >
> > Hi, what's the status of this work?
> >
> > We're preparing GLVND in Debian experimental now that 17.1.0 is out, and
> > my plan is to get it in Ubuntu Artful some time this summer.
> >
> TL;DR; if you can live with broken IGLX and eglGetDisplay + GBM things
> are safe to use with Mesa 17.1.0.
> 
> A more comprehensive TODO on the topic of libglvnd is below.
> 
> - DONE - mesa: merge the EGL libglvnd implementation
> - DONE - mesa: investigate if linking the DRI modules against
> libglapi.so is safe
> - WIP - mesa: do not install GLES libraries/headers/pkg-config files
> when libglvnd is enabled
> Depends on the header/pkg-config bits below
> - TODO - libglvnd: broke indirect GLX, should be fixed once libglvnd
> provides libglapi.so.
> - WIP - libglvnd: eglGetDisplay has broken GBM support
> - TODO - libglvnd: install the pkg-config files
> - TODO - libglvnd: (or Khronos) should provide the headers - depends
> on the next two items
> - TODO - libglvnd: tests to ensure we don't break the ABI
> - WIP - Khronos: correctly manage different EGL platforms
> Patches are on mesa-dev@, need to push through Khronos
> - TODO - Khronos: upstream/ratify the Wayland EGL extensions
> 
> The topics involving [upstream] libglvnd do take a while since I'm not
> good at selling it to the upstream maintainer :-\

Understood! Do you happen to have an update on these topics? Although many
Linux distributions already switched to libglvnd I believe. I've found a
v1.0.0 tag in libglnvnd and that's what (open)SUSE currently is/will be using
in their latest products. Together with Mesa 18.0.2.

Thanks,
Stefan

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