<div dir="ltr">It could be that while the GPU supports gpu_shader4 maybe it doesn't expose that in a 2.1 context for some reason, only in a 3.1 context. Currently we<div><br></div><div>- try for 3.2 context, if we get it we are good</div><div><br></div><div>- otherwise try for a 2.1 context with the gpu_shader4 extension</div><div><br></div><div>we could add a middle step where we try for a 3.1 context with gpu_shader4 if we found a system where that made a difference.</div><div><br></div><div>Ken</div><div><br></div><div><br><div><br></div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Feb 11, 2016 at 9:09 AM, Marcus D. Hanwell <span dir="ltr"><<a href="mailto:marcus.hanwell@kitware.com" target="_blank">marcus.hanwell@kitware.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Wed, Feb 10, 2016 at 6:36 PM, Ken Martin <<a href="mailto:ken.martin@kitware.com">ken.martin@kitware.com</a>> wrote:<br>
> You can use renWin->SupportsOpenGL() to see if the system is supported. It<br>
> tries to do this gracefully.<br>
><br>
> The minimum requirement right now is OpenGL 2.1 with the shader4 extension.<br>
> From what I can see on the web intel HD 2000 should support that but clearly<br>
> glew does not think so. Maybe the shader4 extension is not exposed on the<br>
> 2.1 context?<br>
><br>
I will investigate making the application fail more gracefully. The<br>
card seems to be conforming to what Intel stated - OpenGL 3.1. The VTK<br>
code is rejecting it, so I guess it is not exposed or not available.<br>
This is the on-die GPU with an i7 chip, it was working pretty well in<br>
previous tests but I guess we tightened up the feature checking.<br>
<span class="HOEnZb"><font color="#888888"><br>
Marcus<br>
</font></span></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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