[Openmcl-devel] openGL

Hamilton Link helink at sandia.gov
Tue Dec 17 18:04:41 UTC 2002


I think there are a couple of opengl examples using openmcl under 
linuxppc (make that one, I guess) made by me, but it's been a while 
since I tested it. Also I was using glut and that caused some problems 
(glut DEMANDS that it be the event handler, and there is no API for 
managing the event loop and passing it events manually as there is in 
other GUI APIs) but it was straightforward to convert my existing C++ 
glut example program over to lisp. I'd say the main difficulty was 
making sure the C foreign data was properly formed when converting back 
and forth.

I never got around to trying to use the cocoa openglview (or whatever 
it's called) but the cocoa-inspector is I think a pretty decent cut at 
building a self-contained nib-based ObjC demo. I suspect the two 
concepts could be fused by someone who...

a) was reasonably determined
b) had a pretty good idea of what they wanted (the turn-around time for 
changes gets a little bigger when you're modifying the nib files and 
ObjC class defns)
c) had access to reasonably good opengl and cocoa API documentation

Let me think about it, and I'll post another email to the list (and to 
you) shortly -- I made some notes about how I might go about creating 
another objc gui using lisp, and I think I had some opinions about how 
to use the objc openglview or whatever it was called to do something. 
This might be of use to you.

Over all I'd guess that the objective c approach should be easier than 
the straight C approach, because you *shouldn't* have to worry as much 
about converting data between formats. Whether this guess pans out or 
not is anyone's guess.

re: your other problem. Requiring cocoa-inspector, or cocoa by itself 
(cocoa-inspector requires cocoa if it's not already there) works fine 
for me under Jaguar (10.2.2) with openmcl 0.13.2, with the latest CVS 
stuff. If you still have the problem (under any version of OS X) after 
you're using the patched sources (if you're planning to do objc 
interface stuff I hope going through the build process isn't a big 
problem), do a verbose backtrace "(:b t)" and post it back to the list.

ttyl,
hamilton

On Tuesday, December 17, 2002, at 10:34 AM, nik gaffney wrote:

>
> befor going to far down the wrong path..  i thought id ask if anyone 
> is using
> opengl sucessfully under osX ? which interfaces would you recomend?  
> are
> there any which work relatively painlessly with both apples gl, and 
> mesa on
> linux?
>
>
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>


>
> hi,
>  after setting up openmcl on osX, ive had some problems trying to get 
> the
> cocoa demos working (see below). i couldnt get the OpenMCL.app (from 
> cvs)  to
> open either. .. which may be a related problem. any suggestions?
>
> Welcome to OpenMCL Version (Beta: Darwin) 0.13.2!
> ? (require "cocoa")
>> Error: problems loading bundle: can't determine class name
>> While executing: INIT-COCOA-APPLICATION
>> Type :POP to abort.
> Type :? for other options.
> 1 > (require "COCOA-INSPECTOR")
> "COCOA-INSPECTOR"
>
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>



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