combining OpenGL and Mesa

[Stef Desmet]

Hello,

When VTK 3.* came with support for the Mesa offscreen renderer we wanted to be
able to decide at run time which graphica library to use (e.g. an OpenGL application on a SGI
using Mesa for the offscreen rendering). So we needed to compile both the OpenGL
and Mesa classes in our libs. Althought I did a configure --with-opengl --with-mesa
I needed to edit the system.make to add ${MESA_OBJ} at GRAPHICS_API_OBJ and -DVTK_USE_MESA
at GRAPHICS_API_FLAGS. 
Everything worked well on sgi and alpha but not on Linux. Due to multiple defined symbols
in the VTK graphics lib it crashed when linking the VTK tcl binaries (warnings on the other 
platforms). The problem is that
most Mesa classes are an exact copy of the OpenGL class just changing the class name with a 
#define statement in the class .h file. However the vtkOpenGLPolyDataMapper class has some
helper function (vtkOpenGLBeginPolyTriangleOrQuad ... vtkOpenGLDrawNSTW) and because these are
no member functions the names are not changed by the #define statement of the preprocessor.
Because these are local functions for the class it is enough to declare them static to avoid
multiple definition errors in the libVTKGraphics file.

Is it possible to change this in the source code of vtkOpenGLPolyDataMapper.cxx ?

-- 
Stef Desmet                                         
Katholieke Universiteit Leuven                      Tel. +32-16-321041
Departement Elektrotechniek - ESAT                  Fax. +32-16-321986
Centrum voor Beeld- en Spraakverwerking - PSI       Telex 25914 ELEKUL
Kardinaal Mercierlaan 94         eMail stef.desmet at esat.kuleuven.ac.be
B-3001 Heverlee Leuven    URL <http://www.esat.kuleuven.ac.be/~desmet>
B E L G I U M 
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