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

From: JP Verkamp (racket at jverkamp.com)
Date: Thu May 17 19:04:22 EDT 2012

Interesting. Taking away the gl-world code and using the code to
create a canvas% with a gl-context from here (
) 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
> 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

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