Re: [PyOpenGL-Users] glut, freeglut, dlls lookup

[G. E. D. <ge...@ho...>]

Here are some changes to provide selection of freeglut.dll or glut32.dll for
PyOpenGL on Win32 platforms.

1) Put both dlls in site-packages\OpenGL\DLLS.
2) Add USE_FREEGLUT to site-packages\OpenGL\__init__.py as follows:

   FROM:
   ----

   UNSIGNED_BYTE_IMAGES_AS_STRING = True

   # Declarations of plugins provided by PyOpenGL itself

   TO:
   ---

   UNSIGNED_BYTE_IMAGES_AS_STRING = True

   USE_FREEGLUT = False

   # Declarations of plugins provided by PyOpenGL itself

3) Make following changes to site-packages\OpenGL\platforms\win32.py.

   FROM:
   -----
   """Windows-specific platform features"""
   import ctypes

   from OpenGL.platform import ctypesloader, baseplatform

   class Win32Platform( baseplatform.BasePlatform ):
       """Win32-specific platform implementation"""

        GLUT_GUARD_CALLBACKS = True
	GL = OpenGL = ctypesloader.loadLibrary( ctypes.windll, \
                        'opengl32', mode = ctypes.RTLD_GLOBAL )
	GLU = ctypesloader.loadLibrary( ctypes.windll, \
                'glu32', mode = ctypes.RTLD_GLOBAL )
        try :
            GLUT = ctypesloader.loadLibrary( ctypes.windll, \
                     'glut32', mode = ctypes.RTLD_GLOBAL )
        except WindowsError, err:
            GLUT = None
        GLE = None

   TO:
   ---
   """Windows-specific platform features"""
   import ctypes

   from OpenGL import USE_FREEGLUT
   from OpenGL.platform import ctypesloader, baseplatform

   class Win32Platform( baseplatform.BasePlatform ):
       """Win32-specific platform implementation"""

        GLUT_GUARD_CALLBACKS = True
	GL = OpenGL = ctypesloader.loadLibrary( ctypes.windll, \
                        'opengl32', mode = ctypes.RTLD_GLOBAL )
	GLU = ctypesloader.loadLibrary( ctypes.windll, \
                'glu32', mode = ctypes.RTLD_GLOBAL )
        if USE_FREEGLUT :
            try :
                GLUT = ctypesloader.loadLibrary( ctypes.windll, \
                         'freeglut', mode = ctypes.RTLD_GLOBAL )
            except WindowsError, err:
                GLUT = None
        else :
            try :
                GLUT = ctypesloader.loadLibrary( ctypes.windll, \
                         'glut32', mode = ctypes.RTLD_GLOBAL )
            except WindowsError, err:
                GLUT = None
        GLE = None

4. Make following changes to site-packages\OpenGL\GLUT\__init__.py.

   FROM:
   -----

   try:
       from OpenGL.GLUT.freeglut import *
       HAVE_FREEGLUT = False
   except ImportError, err:
       HAVE_FREEGLUT = True

   TO:
   ---

   try:
       from OpenGL.GLUT.freeglut import *
       if bool(glutMainLoopEvent) : HAVE_FREEGLUT = True
       else                       : HAVE_FREEGLUT = False
   except ImportError, err:
       HAVE_FREEGLUT = False

5. Import PyOpenGL GL, GLE, and GLUT modules using freeglut like this:

   import OpenGL
   OpenGL.USE_FREEGLUT = True
   from OpenGL.GL import *
   from OpenGL.GLU import *
   from OpenGL.GLUT import *