<div dir="ltr">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. 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.<div><br></div><div>Thanks Again!</div><div>Ken</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 26, 2015 at 6:41 AM, Albert Freeman <span dir="ltr"><<a href="mailto:albertwdfreeman@gmail.com" target="_blank">albertwdfreeman@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 26 November 2015 at 11:37, Albert Freeman <<a href="mailto:albertwdfreeman@gmail.com">albertwdfreeman@gmail.com</a>> wrote:<br>
> On 25 November 2015 at 22:45, Ken Martin <<a href="mailto:ken.martin@kitware.com">ken.martin@kitware.com</a>> wrote:<br>
>><br>
>> Noob question incoming... I have an application that requests a 3.2 core<br>
>> context from Mesa. I tell folks to make sure they have mesa version 10.6.5<br>
>> or later which I thought supported OpenGL 3.2. Usually this works but now<br>
>> and then I get users who's Mesa (including version 11) fails to provide a<br>
>> 3.2 Core context. I tell them to set<br>
>><br>
>> MESA_GL_VERSION_OVERRIDE=3.2<br>
>><br>
>> and<br>
>><br>
>> MESA_GLSL_VERSION_OVERRIDE=150 (or something like that)<br>
>><br>
>> and it generally works. But I'm not sure why the original request for 3.2<br>
>> Core is failing on some systems (drivers?). Looking at<br>
>><br>
>> <a href="http://mesamatrix.net/" rel="noreferrer" target="_blank">http://mesamatrix.net/</a><br>
>><br>
>> leads me to think that all drivers with a recent mesa should be fine with<br>
>> 3.2 Core but obviously I am missing something. Do I need to be telling them<br>
>> to use a specific driver? Is there a list of drivers that do not support 3.2<br>
>> I should tell them to avoid? Anything else come to mind?<br>
>><br>
>> I just want to try to provide a bit more help to folks to get them up and<br>
>> running with Mesa and even better get our code to handle it automatically if<br>
>> we could.<br>
>><br>
>> Any pointers appreciated. The application is vtk.<br>
>><br>
>> Thanks<br>
>> Ken<br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
>><br>
>> --<br>
>> Ken Martin PhD<br>
>> Chairman & CFO<br>
>> Kitware Inc.<br>
>> 28 Corporate Drive<br>
>> Clifton Park NY 12065<br>
>> <a href="tel:518%20371%203971" value="+15183713971">518 371 3971</a><br>
>><br>
>> This communication, including all attachments, contains confidential and<br>
>> legally privileged information, and it is intended only for the use of the<br>
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>> _______________________________________________<br>
>> mesa-users mailing list<br>
>> <a href="mailto:mesa-users@lists.freedesktop.org">mesa-users@lists.freedesktop.org</a><br>
>> <a href="http://lists.freedesktop.org/mailman/listinfo/mesa-users" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/mesa-users</a><br>
>><br>
> Not all mesa drivers support gl 3.2, e.g. the r300 gallium driver in<br>
> the git mesa supports only glsl 1.20:<br>
> case PIPE_CAP_GLSL_FEATURE_LEVEL:<br>
> return 120;<br>
><br>
> That website is based on gl3.txt. It does not list all drivers mesa<br>
> supports (as gl3.txt dosen't). They are both only meant to be a rough<br>
> guide. The svga driver apparently supports gl 3.3 and it isn't even<br>
> mentioned in gl3.txt. So I think some of the vtk users have really old<br>
> gpus that don't support gl 3.2. Some gl versions already have software<br>
> emulated components for gl features not supported by the hardware on<br>
> older gpus and some older gpus simply don't have support.<br>
As those environment variables you use simply fake the gl version to<br>
the application. If the application then uses say a gl 3.2 feature<br>
that isn't supported by that driver, the behavior is undefined (e.g.<br>
application can crash).<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Ken Martin PhD<div>Chairman & CFO<br>Kitware Inc.<br>28 Corporate Drive<br>Clifton Park NY 12065<br>518 371 3971<div><br></div><div><span style="font-size:10pt;font-family:Tahoma,sans-serif">This communication,
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Thank you.</span></div></div></div>
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