[racket] gl2d / gl-world: Debugging strange error / determining which libraries are missing

This looks like a bug in gl-world.

gl-world fails to specify the style 'gl to the canvas% constructor.

See: http://docs.racket-lang.org/gui/canvas_.html?q=canvas

I guess Jay is using a platform on which it happens to work without style
'gl.

Stephan

2012/5/18 JP Verkamp <racket at jverkamp.com>

> Interesting. Taking away the gl-world code and using the code to
> create a canvas% with a gl-context from here (
>
> http://lists.racket-lang.org/users/archive/attachments/20100118/4272caa0/attachment-0001.ksh
> ) works just fine (albeit slowly, I need to get the OpenGL drivers
> working correctly again).
>
> Perhaps I'm using gl-world incorrectly. It would still be helpful if
> there was a way to get a better error message to tell me what was
> going wrong though.
>
> On Thu, May 17, 2012 at 6:09 PM, JP Verkamp <racket at jverkamp.com> wrote:
> > For whatever reason I don't have that directory. I ran this version
> instead:
> > https://raw.github.com/plt/racket/master/collects/sgl/examples/gears.rkt
> >
> > That worked fine, rotating the gears as expected and printing this to
> > the console:
> > RENDERER: Mesa DRI Intel(R) 945GM x86/MMX/SSE2
> > VERSION: 1.4 Mesa 8.0.2
> > VENDOR: Tungsten Graphics, Inc
> > EXTENSIONS: ...
> >
> > If it helps, I'm using Ubuntu 12.04 which either didn't have Racket or
> > at least not a newer version, so I'm installing from this PPA:
> > deb http://ppa.launchpad.net/plt/racket/ubuntu precise main
> >
> > On Thu, May 17, 2012 at 4:58 PM, Michael Wilber <mwilber at uccs.edu>
> wrote:
> >> Can you run other OpenGL Racket programs? For example, try the gears
> example:
> >>
> >> racket /usr/lib/racket/collects/sgl/examples/gears.rkt
> >>
> >> On Thu, 17 May 2012 17:49:21 -0400, JP Verkamp <racket at jverkamp.com>
> wrote:
> >>> Hopefully someone out there can help me out, I've run into a a bit of
> >>> a problem with the gl2d and gl-world packages from PLaneT. I've got a
> >>> relatively small sample and whenever I run the code (even after
> >>> commenting out all of the OpenGL specific code other than the big-bang
> >>> call), I always get this error:
> >>>
> >>> send: target is not an object: #f for method: call-as-current
> >>>
> >>> The one relevant response I've found thus far on the subject is from
> >>> Matthew Flatt from last December on the mailing list (
> >>> http://lists.racket-lang.org/users/archive/2011-October/048813.html )
> >>> which says to check "Do you have "libgdkglext-x11-1.0" and
> >>> "libgtkglext-x11-1.0" installed?", which I do. There's a .so for each
> >>> in my /usr/lib directory. After that though, I'm not sure where to go.
> >>> Is there perhaps some way to check which libraries that Racket is
> >>> trying to load / what else might be causing the error?
> >>>
> >>> Thanks,
> >>> JP
> >>> ____________________
> >>>   Racket Users list:
> >>>   http://lists.racket-lang.org/users
>
> ____________________
>  Racket Users list:
>  http://lists.racket-lang.org/users
>
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