Re: glGenFramebuffers undefined

On 12-09-12 02:13 PM, Chris Weisiger wrote:
> (Sorry for the spam to the moderators -- I hadn't finished processing
> my membership before sending the first copy of this message)
>
> I have a program I wrote that works fine on OSX*, but is failing on
> Windows when I call gnGenFramebuffers. The exact error message is:
>
> Attempt to call an undefined alternate function (glGenFramebuffers,
> glGenFramebuffersEXT), check for bool(glGenFramebuffers) before
> calling
>
> I can't figure out why this isn't working. If I do try
> glGetBoolean(glGenFramebuffers) then I get this error:
Um, that should be:

      bool( glGenFramebuffers )

or you can just use it in a boolean context, like:

         if not self.haveInited:
             if not glGenFramebuffers:
                 print 'No glGenFramebuffers implementation found'
                 raise SystemExit( 1 )

so the problem becomes, why doesn't your context have glGenFrameBuffers 
or glGenFrameBuffersEXT.  You can see the extensions available to the 
current context like so:

         if not self.haveInited:
             for ext in glGetString( GL_EXTENSIONS ).split():
                 print ext
             print glGetString( GL_VERSION )
             if not glGenFramebuffers:
                 print 'No glGenFramebuffers implementation found'
                 raise SystemExit( 1 )

which will print out the name of each extension on the system, and then 
the core version.  GL_EXT_framebuffer_object, GL_ARB_framebuffer_object 
or a core version of 3.0 or above *should* provide the entry point.

HTH,
Mike

-- 
________________________________________________
   Mike C. Fletcher
   Designer, VR Plumber, Coder
   http://www.vrplumber.com
   http://blog.vrplumber.com


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