[vtk-developers] extension wrangler

[Jeff Lee]

Moreland, Kenneth wrote:

> The dlopen technique was dissabled because it was proving to be 
> unreliable.  Some of VTK's dashboard tests were continually failing 
> because VTK was being compiled against one OpenGL library (which 
> happened to be static) and the dlopen was openening a shared object 
> library elsewhere.  Thus, it would look like the extension was loaded 
> correctly, but the application would crash if you tried to use any of 
> the functions.
>
> What if the dlopen method were only enabled when vtk is built shared?  I 
> saw that vtkOpenGLExtensionManagerConfigure.h that does
> #define OPENGL_LIBRARIES 
> "/usr/lib/libGL.so;-lSM;-lICE;-lSM;-lICE;/usr/X11R6/lib/libX11.so;/usr/X11R6/lib/libXext.so;/usr/X11R6/lib/libX11.so;/usr/X11R6/lib/libXext.so"
> 
> If you do dlopen with a null in the first argument, the loader will 
> search the libpath (you don't really need to specify).  
uhh, wrong.  I meant just pass the lib without the path and the loader 
should search the application libpath...
Is this the kind
> of behavior we should support?  Are there cases when this approach 
> yields undesirable results?  This appears to be what glew does.
> Regards,
> -J



>
> Ultimately we could not figure out a way to ensure that the dlopen 
> tried to open the same library that was already being used. (The 
> problem gets more compilicated when you compile on one machine and run 
> on another.) If someone could solve this problem, then the dlopen 
> method would work just fine.
>
> -Ken
>
>
> -----Original Message-----
> From: vtk-developers-bounces+kmorel=sandia.gov at vtk.org on behalf of 
> Jeff Lee
> Sent: Tue 11/15/2005 12:31 PM
> To: vtk-developers
> Subject: [vtk-developers] extension wrangler
>
> Hi,
> Does anyone know why the extension wrangler in vtk has the fallback
> dlopen technique disabled?  Is there some way this could be fixed for
> systems without glxProcAddressARB functionality?  Is the wrangler meant
> to be a runtime wrangler, or just compile-time?
> Regards,
> Jeff
> _______________________________________________
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>
>

-- 
Jeff Lee
Senior Software Engineer
Computational Dynamics North America Ltd
21 Lafayette Street, Suite 230
Lebanon NH 03766 USA
fax:   603 643 9994
phone: 603 643 9993 x109
http://www.cd-adapco.com

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