[Mesa-users] Question about support for OpenGL 3.2 Core context

[Benjamin Bellec]

You can also check with this tool:
https://secure.freedesktop.org/~imirkin/glxinfo/glxinfo.html#v=Mesa%2010.6.0

Anyway, regarding the users complaining about GL3.2 core context fail, you
should check what hardware they have.

2015-11-26 12:41 GMT+01:00 Albert Freeman <albertwdfreeman at gmail.com>:

> On 26 November 2015 at 11:37, Albert Freeman <albertwdfreeman at gmail.com>
> wrote:
> > On 25 November 2015 at 22:45, Ken Martin <ken.martin at kitware.com> wrote:
> >>
> >> Noob question incoming... I have an application that requests a 3.2 core
> >> context from Mesa.  I tell folks to make sure they have mesa version
> 10.6.5
> >> or later which I thought supported OpenGL 3.2.  Usually this works but
> now
> >> and then I get users who's Mesa (including version 11) fails to provide
> a
> >> 3.2 Core context. I tell them to set
> >>
> >> MESA_GL_VERSION_OVERRIDE=3.2
> >>
> >> and
> >>
> >> MESA_GLSL_VERSION_OVERRIDE=150 (or something like that)
> >>
> >> and it generally works. But I'm not sure why the original request for
> 3.2
> >> Core is failing on some systems (drivers?).  Looking at
> >>
> >> http://mesamatrix.net/
> >>
> >> leads me to think that all drivers with a recent mesa should be fine
> with
> >> 3.2 Core but obviously I am missing something. Do I need to be telling
> them
> >> to use a specific driver? Is there a list of drivers that do not
> support 3.2
> >> I should tell them to avoid? Anything else come to mind?
> >>
> >> I just want to try to provide a bit more help to folks to get them up
> and
> >> running with Mesa and even better get our code to handle it
> automatically if
> >> we could.
> >>
> >> Any pointers appreciated. The application is vtk.
> >>
> >> Thanks
> >> Ken
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> --
> >> Ken Martin PhD
> >> Chairman & CFO
> >> Kitware Inc.
> >> 28 Corporate Drive
> >> Clifton Park NY 12065
> >> 518 371 3971
> >>
> >> This communication, including all attachments, contains confidential and
> >> legally privileged information, and it is intended only for the use of
> the
> >> addressee.  Access to this email by anyone else is unauthorized. If you
> are
> >> not the intended recipient, any disclosure, copying, distribution or any
> >> action taken in reliance on it is prohibited and may be unlawful. If you
> >> received this communication in error please notify us immediately and
> >> destroy the original message.  Thank you.
> >>
> >> _______________________________________________
> >> mesa-users mailing list
> >> mesa-users at lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/mesa-users
> >>
> > Not all mesa drivers support gl 3.2, e.g. the r300 gallium driver in
> > the git mesa supports only glsl 1.20:
> >         case PIPE_CAP_GLSL_FEATURE_LEVEL:
> >             return 120;
> >
> > That website is based on gl3.txt. It does not list all drivers mesa
> > supports (as gl3.txt dosen't). They are both only meant to be a rough
> > guide. The svga driver apparently supports gl 3.3 and it isn't even
> > mentioned in gl3.txt. So I think some of the vtk users have really old
> > gpus that don't support gl 3.2. Some gl versions already have software
> > emulated components for gl features not supported by the hardware on
> > older gpus and some older gpus simply don't have support.
> As those environment variables you use simply fake the gl version to
> the application. If the application then uses say a gl 3.2 feature
> that isn't supported by that driver, the behavior is undefined (e.g.
> application can crash).
> _______________________________________________
> mesa-users mailing list
> mesa-users at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/mesa-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/mesa-users/attachments/20151126/402a9414/attachment.html>