Re: gl-render.cc: framework OpenGL on MacOSX

[Thomas Treichl]

Shai Ayal schrieb:
> On Sat, Jan 31, 2009 at 1:09 AM, Thomas Treichl <address@hidden> wrote:
> > Hi,
> >
> > I'm currently trying to compile gl-render.cc against Mac's OpenGL framework.
> > If I compile against Mac's "X11/GL" then everything is just fine, but with
> > "framework OpenGL" I have got problems. I already was able to do a hack for
> > this:
> > but I'm not able to find out what the compiler wants from me for this:
> >
> > gl-render.cc: In member function 'virtual void opengl_tesselator::init()':
> > gl-render.cc:273: error: invalid conversion from 'void (*)()' to 'GLvoid
> > (*)(...)'
> > gl-render.cc:273: error:   initializing argument 3 of 'void
> > gluTessCallback(GLUtesselator*, GLenum, GLvoid (*)(...))'
>
> The type for the gluTessCallback was always problematic. In fact in
> octplot I dedicated a whole h file just for gettign it right. Have a
> look for what used to work for octplot:
> http://octplot.svn.sourceforge.net/viewvc/octplot/trunk/octplot/src/glutesscb.h?revision=437&view=markup

Thank you so much Shai, I nearly was going crazy ;) My quick hack in line 224 of 
gl-render.cc now is

  typedef GLvoid (CALLBACK *fcn) (...);

instead of

  typedef void (CALLBACK *fcn) (void);

I didn't know that (...) is something C++ valid. I can continue working on 
gl-render.cc in the evening. Thanks again!

> > The second question is: Are there any other platforms that have a header
> > "OpenGL/gl.h" instead of "GL/gl.h" or do we just have this "OpenGL/gl.h" on
> > Mac? I'm asking this question because I'd like to adjust the test procedure
> > OCTAVE_OPENGL in aclocal.m4.
>
> Why don't you implement a test for the feature, not version -- i.e. if
> "GL/gl.h" is not found, try "OpenGL/gl.h" ?

Right now "GL/gl.h" is found and "OpenGL/gl.h" is found, it depends on which 
-Ipath is given first ;) I'll have a look how I put the test for framework 
OpenGL into configure.in.

Best regards,

  Thomas