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

[David Gobbi]

Hi Steve,

If you install xquartz, you should see glx.h in /usr/X11R6/include.  On OS
X, X11 always had its own GL headers and libraries inside
/usr/X11R6/include and /usr/X11R6/lib.  You'd definitely have to link to
those libraries, rather than linking to OpenGL.framework.

I remember that VTK-X11 on OS X was a well-supported configuration back in
2005 or so.

 - David


On Mon, Jan 29, 2018 at 8:06 PM, Langer, Stephen A. (Fed) <
stephen.langer at nist.gov> wrote:

> OSX does come with OpenGL, but not the X11 parts of it.  There's no glx.h
> in /System/Library/Frameworks/OpenGL.framework/Headers, and the libraries
> don't define glXChooseFBConfig and other symbols used by VTK.
>
>
>
> Just firing up ccmake and not making any changes to the configuration
> gives VTK_USE_X=OFF and VTK_USE_COCOA=ON, but I want them the other way
> around.  Changing those two settings but nothing else makes it try to link
> to the OpenGL.framework, and the build fails because the framework doesn't
> support X11.   Pointing OPENGL_INCLUDE_DIR, OPENGL_gl_LIBRARY, and
> OPENGL_glu_LIBRARY to the mesa components lets VTK build, but it gives a
> warning at run time when it checks the OpenGL version, and then crashes.
>
>
>
> The reason for doing this is that many (most?) ports in macports use X11
> instead of Cocoa/Quartz, and it's difficult to mix the two.  Our software
> will be easier to distribute if it can be built to use either X11 or
> Cocoa.   Also, we're using gtk2, and it works better in X11.  (Someday
> we'll upgrade to gtk3…)
>
>
>
> -- Steve
>
>
>
> *From: *Ken Martin <ken.martin at kitware.com>
> *Date: *Monday, January 29, 2018 at 3:21 PM
> *To: *"Langer, Stephen A. (Fed)" <stephen.langer at nist.gov>
> *Cc: *"vtkusers at vtk.org" <vtkusers at vtk.org>
> *Subject: *Re: [vtkusers] vtk getting wrong OpenGL version number from
> mesa and macports
>
>
>
> I'm pretty sure OSX comes with OpenGL and OSX always provides at least
> OpenGL 3.2 as of any version of OSX in the past few years. I'm not an OSX
> wizard, but generally default vtk builds straight out of the box last I
> checked. Maybe try a clean VTK build using all the defaults and see if that
> works.
>
>
>
> On Mon, Jan 29, 2018 at 3:08 PM, Langer, Stephen A. (Fed) <
> stephen.langer at nist.gov> wrote:
>
> Hi --
>
> I'm revisiting earler efforts to get vtk working with X11 on macOS.  I'd
> been building vtk with Cocoa because with X11 vtk was complaining that it
> couldn't find OpenGL version 3.2 or later.  I'm using macports to install
> OpenGL (mesa), and supposedly it's providing version 4.5 of OpenGL.
>
> I've tried building vtk both with and without VTK_USE_SYSTEM_GLEW, since
> vtk gets the version number from glew.  I tried tracing though the process
> of getting the version number, starting with vtkOpenGLRenderWindow::OpenGLInitContext(),
> but found the glew code to be amazingly opaque.   All I know for sure is
> that in vtk's OpenGLInitContext, GLEW_VERSION_3_2 and GLEW_VERSION_3_1 are
> empty, but the glew source code *does* set them, in glewContextInit() in
> glew.c.  I don't know what it sets them *to*, though.
>
> I'm using the latest vtk from git master, but the problem occurred with
> released versions too.
>
> I don't know if this is a vtk problem or a macports problem or a mesa
> problem, but I didn't get a helpful answer from the macports list.  Any
> advice would be much appreciated.
>
> Thanks.
>
>  -- Steve
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://vtk.org/pipermail/vtkusers/attachments/20180129/e1f824bf/attachment.html>