[Mesa-dev] [PATCH demos 0/3] demos release plan and glxinfo: Print more limits

[Pekka Paalanen]

On Fri, 04 Jul 2014 08:45:00 +0100
Steven Newbury <steve at snewbury.org.uk> wrote:

> On Fri, 2014-07-04 at 03:40 -0400, Ilia Mirkin wrote:
> > On Fri, Jul 4, 2014 at 3:37 AM, Steven Newbury 
> >  wrote:
> > >  On Thu, 2014-07-03 at 10:47 +0200, Andreas Boll wrote:
> > > >  2014-07-03 7:39 GMT+02:00 Steven Newbury 
> > > > :
> > > > >   On Wed, 2014-07-02 at 21:04 +0200, Andreas Boll wrote:
> > > > > > >
> > > > > >   I'd like to make a new demos release on Friday, July 4th.
> > > > > >   The last release was on February 24th, 2013. Additionally 
> > > > > > this
> > > > > >   release is needed to fix the build with mesa 10.2. 
> > > > > > (fdo#78101)
> > > > > > > >
> > > > > >   Any objections?
> > > > > > > >
> > > > > >   Also I'd like to get these 3 patches included in the new
> > > > > >  release.
> > > > > > > >
> > > > > >   Andreas.
> > > > > > > >
> > > > > > > >
> > > > > >   Fredrik Höglund (3):
> > > > > >     glxinfo: Print XFB, TBO, and UBO limits
> > > > > >     glxinfo: Print GL_ARB_vertex_attrib_binding limits
> > > > > >     glxinfo: Print GL_EXT_texture_array limits
> > > > > > > >
> > > > > >    src/xdemos/glinfo_common.c | 30 
> > > > > > ++++++++++++++++++++++++++++++
> > > > > >    1 file changed, 30 insertions(+)
> > > > > > > >
> > > > > > >
> > > > >   What about extending eglinfo to have switches to enable 
> > > > > printing
> > > > >  glxinfo
> > > > >   style output for each supported API?
> > > > > > >
> > > > >
> > > >  Sounds good, feel free to send a patch.
> > > >  Although I'm not planning to hold off this release.
> > > >  I can make further releases when required.
> > > > >
> > > > >
> > >  I've been giving this some more thought, it occurs to me that 
> > > since
> > >  there's already es1_info/es2_info progs, what's really needed is 
> > > an
> > >  EGL version of glxinfo/wglinfo (egl_glinfo?) which should be able 
> > > to
> > >  share the glinfo_common code.
> > > >
> > >  While digging though the existing code I noticed the above 
> > > mentioned
> > >  es*_info program only works with X11 EGL, that should probably be
> > >  improved too...
> > > >
> > >  Shall I see if I can code something up to get glinfo output 
> > > through
> > >  EGL?  Would this be he best approach?
> >  
> > I'm sure I'm missing something, but what's wrong with eglinfo?
> >  
> > http://cgit.freedesktop.org/mesa/demos/tree/src/egl/opengl/eglinfo.c
> >  
> > It doesn't share the glinfo_common code, but that should be easily
> > arranged, I would think.
> Of course it's an option to extend eglinfo with switches to select 
> API, but there is already es*_info, which is what made me thing it 
> might be the better approach.  I'm perfectly happy to hack on eglinfo 
> instead! :-)

For me personally, the problem with eglinfo has been that it does
not create any GL context, so cannot report any GL info either. In
the past, the problem was that you needed window system specific
code to create the EGLDisplay and maybe the window too.

EGL_DEFAULT_DISPLAY just won't work everywhere, and in Mesa it
might pick a wrong window system, and the window system will
affect at least EGL capabilities.

Do we now have an acceptable plan of writing a multi-window-system
capable *info program, or are we still stuck with *info programs
written for specific window systems?

I'd really like one that works e.g. on Wayland, and preferably does
not do anything very Mesa specific. Would also be very cool to
use the new extensions allowing to be explicit on which window
system you are intending to use, rather than rely on the EGL
implementation guessing based on your EGLNativeDisplay value.

The other complication with writing a multi-API *info program is,
that you need to link to a different library depending on the API
you choose: libGLESv1_CM vs. libGLESv2 vs. libGL...

Libepoxy to the rescue?
https://github.com/anholt/libepoxy


Thanks,
pq