[vtkusers] vtk getting wrong OpenGL version number from mesa and macports

[Ken Martin]

On Tue, Jan 30, 2018 at 3:17 PM, Langer, Stephen A. (Fed) <
stephen.langer at nist.gov> wrote:

> From within vtkXOpenGLRenderWindow::WindowInitialize():
>
> (1)  vtkXOpenGLRenderWindow::CreateAWindow(),  in the block under the
> comment "try for 32 context", is successfully creating an OpenGL 4.5
> context (independent of the value of MESA_GL_VERSION_OVERRIDE).
>
>
That is good.


> (2) Then vtkOpenGLRenderWindow::OpenGLInitContext() calls glewInit() and
> finds that GLEW_VERSION_3_1 and GLEW_VERSION_3_2 aren't set, which they
> should be if the GL version is 4.5, right?   I don't really understand the
> difference between GL_VERSION and GLEW_VERSION_x_y.
>
>
Yes, with 4.5 you also have 3.1 and 3.2. The glew that comes with VTK is
modified to fix an issue in the original glew that caused glew to think it
did not have 3.1/3.2 when on OSX. Maybe somehow a system glew is still
being picked up.



> Changing the setting of VTK_USE_SYSTEM_GLEW doesn't affect this behavior.
> I made sure to uninstall macports' glew after turning off
> VTK_USE_SYSTEM_GLEW.
>
> Sorry about forgetting to CC the list earlier!
>
>  -- Steve
>
> On 1/30/18, 9:33 AM, "Ben Boeckel" <ben.boeckel at kitware.com> wrote:
>
>     [ Adding the list back to CC. Please keep the list in the loop. ]
>
>     On Tue, Jan 30, 2018 at 03:17:25 +0000, Langer, Stephen A. (Fed) wrote:
>     > I'm not explicitly requesting any profile -- I'm just trying to use
>     > vtkXOpenGLRenderWindow, which is being created by
>     > vtkRenderWindow::New().
>
>     I asked since you said you were looking at the requests; I assume the
>     profile is in there around the same area.
>
>     > Is MESA_GL_OVERRIDE a run time variable, or do I set it when building
>     > mesa or vtk?  Setting it at run time doesn't do anything, unless I'm
>     > doing it wrong.. I tried
>
>     Sorry, I have this one history item floating around that I really need
>     to purge (done now). It's actually called `MESA_GL_VERSION_OVERRIDE`.
>
>     >    % MESA_GL_OVERRIDE=3.2 [my program]
>     > and it gave the same warnings as before.
>
>     This is the right way of using it, just the wrong name :) .
>
>     --Ben
>
>
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-- 
Ken Martin PhD
Distinguished Engineer
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065

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