[Cmake] FindOpenGL and Windows

[William A. Hoffman]

I know at a binary level they have to be the same.
In all of our applications that use OpenGL, even with
NVidia extensions we have not needed a different GL.h.
Basically, the reason for not adding it for windows was
that it was not needed.  You don't want to add include
directories for MS internal stuff.  GLUT is not a standard
install on windows so it has a variable.    The OPENGL_INCLUDE_DIR
is needed on UNIX because GL.h is often not installed in /usr/include
on a UNIX machine and not in the default path for the compiler.
On windows, it is in effect installed in the equivalent of /usr/include
for both borland and MS compilers.

-Bill


At 03:43 PM 9/2/2004, Anton Deguet wrote:
>Hello,
>
>We are using the NVidia SDK 8 for some specific extensions as well as
>CG.  The files GL.h and gl.h from NVidia and Microsoft certainly
>differs.  They could be equivalent, but the number of differences one
>can see using WinDiff is too high for me to tell.
>
>I guess this OPENGL_INCLUDE_DIR has been added to support multiple
>versions of OpenGL on the same computer.  It is defined for CMAKE/Unix 
>and there is a similar variable for GLUT_INCLUDE_DIR (both Windows and
>Unix), is there any reason to not have this variable?
>
>Sincerely,
>
>Anton
>
>
>
>On Thu, 2004-09-02 at 15:20, William A. Hoffman wrote:
>> Is the gl.h different for the NVIDIA SDK?  Or are there other files
>> that you need to include?
>> 
>> -Bill
>> 
>> 
>> At 01:44 PM 9/2/2004, Anton Deguet wrote:
>> >Hello,
>> >
>> >I'm building my application using OpenGL and OpenGL extensions on 
>> >Windows.  I have the gl.h and the extension header files in a special
>> >directory that comes with the NVIDIA  SDK distribution, not  with the
>> >.net compiler.  In other words, I have a non-standard location for the
>> >OpenGL header files.
>> >CMake comes with a FindOpenGL module that is supposed to take care of
>> >OpenGL header files.  It defines a OPENGL_INCLUDE_DIR variable for unix
>> >and cygwin.  But it does not define it for Windows.  Of course, I can
>> >have my own variable.  But I thought that the implementation would be
>> >more complete if the provided module already has that.
>> >
>> >Could FindOpenGL.cmake to define the search path for Windows as well?
>> >
>> >Setup: CMake 2.0.3 for Windows.  Compiler: .NET 7
>> >
>> >
>> >Thanks,
>> >
>> >Anton
>> >
>> >
>> >
>> >
>> >
>> >-- 
>> >Anton Deguet                          Systems Engineer
>> >ERC CISST                     Johns Hopkins University
>> >http://cisstweb.cs.jhu.edu                410 516 5261
>> >
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>> >Cmake at www.cmake.org
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>> 
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>-- 
>Anton Deguet                          Systems Engineer
>ERC CISST                     Johns Hopkins University
>http://cisstweb.cs.jhu.edu                410 516 5261
>
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