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 <rac...@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 <rac...@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 <mwil...@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 <rac...@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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