Re: eXene and openGL

EXene is now being supported and developed by Ally Stoughton and his  
students,
so they may be able to help you get the examples working.

I'm not particularly optimistic about supporting OpenGL in EXene.   
While it would
be possible to implement the GLX wire protocol [Historical note: when  
I was actively
working on eXene in the 90's, the protocol was not documented, but  
SGI eventually
released it] in eXene, there are significant performance  
disadvantages to using
that protocol.  For real-time rendering, you want a DRI-style  
implementation, but
I don't know how to support such an approach in eXene.

For a while, I've thought that the low-level parts of eXene ought to  
be rewritten
to sit on top of a C shim (XCB is an obvious choice).  Doing so  
should make it easier
to connect to more modern X extensions, such as the render extension  
and GLX.

An alternative approach is to build a GUI library on top of GLUT (or  
SDL).  I've been
working on this project using mlton, since SML/NJ doesn't have  
callback support, but
I'm hoping that we'll get the necessary hooks in SML/NJ soon.

	- John

On Jan 3, 2007, at 6:40 AM, brian wrote:

> So as I slog through X code to make openGL useful it occurs to me
> that using eXene with openGL tied in would be a really nice way to
> go. eXene3D :-)
>
> There are a couple of problems:
>
> 1 I still can't get eXene examples to work.
>
> 2 Is there a gotcha in terms of the X interface which eXene uses and
> openGL ? eXene uses the socket level interface and I'm not sure what
> that implies for use with openGL.  Wthout thinking too hard, I don't
> think it implies anything.  I simply invoke glX calls using the
> display, window, etc.. I get from the eXene interface.
>
> Solving 1 is just a matter of time and persistence on my part.
>
> Understanding 2 is much more important.  Since I'll probably have to
> do considerable work for 1, I don't want to get to the end of the
> path and find out that there will be some problem connecting eXene/
> openGL.
>
> At first I thought that the use of threading might be a problem, but
> since they are "user level" threads, doesn't seem like that should be
> an issue.
>
> Any opinions ?
>
>
> Brian
>
>
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