Re: Question about support for OpenGL 3.2 Core context

On 12/04/2015 07:10 AM, Ken Martin wrote:
> Thanks! Seems the system in question was using llvmpipe which passes
> ~95% of our tests when we tell it be a 3.2 context using the environment
> variables. For some reason I was thinking llvmpipe was full 3.2 Core.

llvmpipe does support OpenGL 3.2 core profile (3.3 actually).

For your users who are having trouble, seeing the output of glxinfo 
might yield a clue.

-Brian

> I
> tried playing with softpipe to see if that had better results but it had
> significantly more failures. I think the Intel SWR is at the 99% or so
> mark now on our tests so that may be a good bet for our pure software
> rendering.
>
> Thanks Again!
> Ken
>
>
> On Thu, Nov 26, 2015 at 6:41 AM, Albert Freeman
> <[email protected] <mailto:[email protected]>> wrote:
>
>     On 26 November 2015 at 11:37, Albert Freeman
>     <[email protected] <mailto:[email protected]>> wrote:
>      > On 25 November 2015 at 22:45, Ken Martin <[email protected]
>     <mailto:[email protected]>> 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/
>     <https://urldefense.proofpoint.com/v2/url?u=http-3A__mesamatrix.net_&d=BQMFaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=T0t4QG7chq2ZwJo6wilkFznRSFy-8uDKartPGbomVj8&m=DgUiZLZLE5l5BuSC2NBUMBQS2DGA9QhpHNlB-VsdiFA&s=265u7-eKXnTubRJ-iofPSBX-H-LKHhoyVG6X43hKuqs&e=>
>      >>
>      >> 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 <tel:518%20371%203971>
>      >>
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>      >> _______________________________________________
>      >> mesa-users mailing list
>      >> [email protected]
>     <mailto:[email protected]>
>      >> http://lists.freedesktop.org/mailman/listinfo/mesa-users
>     <https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.freedesktop.org_mailman_listinfo_mesa-2Dusers&d=BQMFaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=T0t4QG7chq2ZwJo6wilkFznRSFy-8uDKartPGbomVj8&m=DgUiZLZLE5l5BuSC2NBUMBQS2DGA9QhpHNlB-VsdiFA&s=GUHRuxZw-TCs8qGxwpn4d6zy7Et2yH5D2dq7lVdtxR8&e=>
>      >>
>      > 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).
>
>
>
>
> --
> 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.
>
>
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