[vtk-developers] Windows Intel HD 2000 not working with new rendering backend

[Ken Martin]

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

- try for 3.2 context, if we get it we are good

- otherwise try for a 2.1 context with the gpu_shader4 extension

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.

Ken





On Thu, Feb 11, 2016 at 9:09 AM, Marcus D. Hanwell <
marcus.hanwell at kitware.com> wrote:

> On Wed, Feb 10, 2016 at 6:36 PM, Ken Martin <ken.martin at kitware.com>
> wrote:
> > You can use renWin->SupportsOpenGL() to see if the system is supported.
> It
> > tries to do this gracefully.
> >
> > The minimum requirement right now is OpenGL 2.1 with the shader4
> extension.
> > From what I can see on the web intel HD 2000 should support that but
> clearly
> > glew does not think so. Maybe the shader4 extension is not exposed on the
> > 2.1 context?
> >
> I will investigate making the application fail more gracefully. The
> card seems to be conforming to what Intel stated - OpenGL 3.1. The VTK
> code is rejecting it, so I guess it is not exposed or not available.
> This is the on-die GPU with an i7 chip, it was working pretty well in
> previous tests but I guess we tightened up the feature checking.
>
> Marcus
>



-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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