Re: [Mesa3d-users] undefined reference to 'glBlitFramebufferEXT' when building against Mesa7.7

[Alan Wu <al...@au...>]

tom fogal wrote:
> Alan Wu <al...@au...> writes:
>> I have built and compiled a linux-x86-32 shared object library
>> of Mesa7.7 under Ubuntu8.04, both glxinfo and glewinfo show me
>> that glBlitFramebufferEXT is available however I got the undefined
>> reference error message when I call the function in my program. I
>> also could not find "glBlitFramebufferEXT" when ran a "objdump -x"
>> command on the built library.
> 
> It's just "glBlitFramebuffer" if you're going to call it directly.  At
> least, that holds with my build of semi-recent master..
> 
> If you want to load it dynamically, I would bet that
> 'glXGetProcAddressARB("glBlitFramebufferEXT");' works; leaving off the
> EXT should work too, of course.
> 
> It shows up in glewinfo because GLEW *is* loading it dynamically.
> 
> I'd recommend you just use GLEW yourself; you don't want rely on an
> extension being available at compilation time, anyway.  Even if your
> program is worthless without the extension, at least you'll have enough
> control to pop up a semi-useful error message.
> 
> Cheers,
> 
> -tom

Thanks Tom, I am considering using GLEW too, at this moment we handle 
loading the headers ourselves, perhaps should let GLEW to do it instead.

Interestingly, I have built Mesa7.7 on both 32 and 64 bit machine and 
glBlitFramebuffer is only defined on the 64bit built.

Cheers,
Alan