[vtk-developers] glext.h and glxext.h on OSX

Mon Apr 20 22:21:46 EDT 2009

Picking the location for glext.h or glext.h does not matter in your
case. It would matter if the files provided by the system were too old
and would not include prototypes used by some classes of VTK. But you
would have seen that by a compile error.

On Mac, you don't need glview:

http://www.vtk.org/Wiki/VTK_FAQ#How_do_I_check_which_OpenGL_versions_or_extensions_are_supported_by_my_graphic_card_or_OpenGL_implementation.3F

Read  also this to understand OpenGL compile-time vs run-time:

http://www.vtk.org/Wiki/VTK_FAQ#Terminology
http://www.vtk.org/Wiki/VTK_FAQ#What_is_the_minimal_OpenGL_version_of_the_API_required_to_compile_VTK5.0.3F
http://www.vtk.org/Wiki/VTK_FAQ#What_is_the_minimal_OpenGL_version_required_by_VTK5.2_at_runtime.3F

PS: you should have posted your question to vtkusers not
vtk-developers. This list is for people developing VTK, not people
developing software with VTK (users).

the GL libraries have to point to the Mesa libs and you have to set
VTK_OPENGL_HAS_OSMESA=ON yourself to be able to use offscreen mesa.

On Mon, Apr 20, 2009 at 9:15 PM, Darren Weber
<darren.weber.lists at gmail.com> wrote:
>
> PS, This OpenGL viewer may be useful to detect system capabilities:
> http://www.realtech-vr.com/glview/download.html
>
>
> On Mon, Apr 20, 2009 at 5:39 PM, Darren Weber <darren.weber.lists at gmail.com>
> wrote:
>>
>> Hi Francois,
>>
>> I'm asking for both general recommendation and because some of the
>> VTK-5-4-0 tests failed on my OSX system (see our prior email discussion
>> about that for the ctest details posted to the experimental board from host
>> elegans.buckcenter.org).
>>
>> FYI:
>>
>> From macports mesa (7.4) installation of /opt/local/include/GL/glxext.h
>>
>> /* Header file version number, required by OpenGL ABI for Linux */
>> /* glxext.h last updated 2008/10/22 */
>> /* Current version at http://www.opengl.org/registry/ */
>> #define GLX_GLXEXT_VERSION 21
>>
>>
>> From installation of XQuartz 2.3.1 (xorg-server 1.4.2-apple17) into
>> /usr/X11/include/GL/glxext.h
>>
>> /* Header file version number, required by OpenGL ABI for Linux */
>> /* glxext.h last updated 2007/04/21 */
>> /* Current version at http://www.opengl.org/registry/ */
>> #define GLX_GLXEXT_VERSION 19
>>
>>
>> From apple installation of
>> /Developer/SDKs/MacOSX10.5.sdk/usr/X11/include/GL/glxext.h
>>
>> /* Header file version number, required by OpenGL ABI for Linux */
>> /* glxext.h last updated 2007/04/21 */
>> /* Current version at http://www.opengl.org/registry/ */
>> #define GLX_GLXEXT_VERSION 19
>>
>>
>> There is no glxext.h under /System/Library/Frameworks/OpenGL.framework
>> From
>> /System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/glext.h
>>
>> /*
>> ** License Applicability. Except to the extent portions of this file are
>> ** made subject to an alternative license as permitted in the SGI Free
>> ** Software License B, Version 1.1 (the "License"), the contents of this
>> ** file are subject only to the provisions of the License. You may not use
>> ** this file except in compliance with the License. You may obtain a copy
>> ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
>> ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
>> **
>> ** http://oss.sgi.com/projects/FreeB
>> **
>> ** Note that, as provided in the License, the Software is distributed on
>> an
>> ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
>> ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
>> ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
>> ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
>> **
>> ** Original Code. The Original Code is: OpenGL Sample Implementation,
>> ** Version 1.2.1, released January 26, 2000, developed by Silicon
>> Graphics,
>> ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics,
>> Inc.
>> ** Copyright in any portions created by third parties is as indicated
>> ** elsewhere herein. All Rights Reserved.
>> **
>> ** Additional Notice Provisions: This software was created using the
>> ** OpenGL(R) version 1.2.1 Sample Implementation published by SGI, but has
>> ** not been independently verified as being compliant with the OpenGL(R)
>> ** version 1.2.1 Specification.
>> */
>>
>>
>> Given the above, should I be more specific about how to specify these
>> build library paths?
>>
>> Also, once a specific library dependency is selected, how can I determine
>> if the library can support off-screen rendering, in order to set the cmake
>> variable VTK_OPENGL_HAS_OSMESA (or should I leave that entirely up to
>> cmake)?
>>
>> Thanks again,
>> Darren
>>
>>
>>
>>
>>
>>
>> On Mon, Apr 20, 2009 at 5:13 PM, Francois Bertel
>> <francois.bertel at kitware.com> wrote:
>>>
>>> Hi,
>>>
>>> We try to keep glxext.h in VTK up-to-date with the official file from
>>> opengl.org ( http://www.opengl.org/registry/api/glxext.h )
>>>
>>> Are you asking this question because you encounter some error or just
>>> for a general recommendation?
>>>
>>> In the first part of the file, there is something like:
>>>
>>> /* glxext.h last updated 2008/10/22 */
>>> /* Current version at http://www.opengl.org/registry/ */
>>> #define GLX_GLXEXT_VERSION 21
>>>
>>> you can compare this part with the different versions of glxext.h
>>> provided by your machine and by VTK.
>>>
>>> Right now, the version does not matter too much but I recommend to
>>> point to the one provided with VTK.
>>>
>>>
>>> On Mon, Apr 20, 2009 at 7:28 PM, Darren Weber
>>> <darren.weber.lists at gmail.com> wrote:
>>> > Please advise on which headers to use when building VTK-5.4.0 on OSX
>>> > for
>>> > glext.h and glxext.h
>>> >
>>> > The default cmake settings are:
>>> > VTK_GLEXT_FILE:FILEPATH=<srcPath>/Utilities/ParseOGLExt/headers/glext.h
>>> >
>>> > VTK_GLXEXT_FILE:FILEPATH=<srcPath>/Utilities/ParseOGLExt/headers/glxext.h
>>> >
>>> > The following are possible alternatives for glext.h (similarly for
>>> > glxext.h)
>>> > on an OSX system (10.5.6, with Xcode 3.x, XQuartz, and macports with
>>> > mesa):
>>> >
>>> > Apple installations:
>>> >
>>> > /Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/glext.h
>>> > /Developer/SDKs/MacOSX10.4u.sdk/usr/X11R6/include/GL/glext.h
>>> >
>>> > /Developer/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/glext.h
>>> > /Developer/SDKs/MacOSX10.5.sdk/usr/X11/include/GL/glext.h
>>> > /System/Library/Frameworks/OpenGL.framework/Versions/A/Headers/glext.h
>>> >
>>> > macports installation of mesa:
>>> > /opt/local/include/GL/glext.h
>>> >
>>> > XQuartz installation:
>>> > /usr/X11/include/GL/glext.h
>>> >
>>> > Thanks in advance,
>>> > Darren
>>> >
>>> >
>>> > _______________________________________________
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>>> >
>>> >
>>>
>>>
>>>
>>> --
>>> François Bertel, PhD  | Kitware Inc. Suite 204
>>> 1 (518) 371 3971 x113 | 28 Corporate Drive
>>>                      | Clifton Park NY 12065, USA
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
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>>>
>>
>
>

-- 
François Bertel, PhD  | Kitware Inc. Suite 204
1 (518) 371 3971 x113 | 28 Corporate Drive
                      | Clifton Park NY 12065, USA