From: tsuraan <tsuraan@...>
Date: 2006-01-30T01:50:55+09:00
Subject: Re: [ANN] OpenGL-0.32g for Apple MacOS X

Trying this, I get

objc: failed objc_getClass(NSObject) for GLUTApplication->isa->isa
objc: please link appropriate classes in your program
Trace/BPT trap

I cleaned out the old opengl.bundle and glut.bundle and re-built the
bindings from the new package.  I have no idea what this error means,
so any tips would be appreciated :)  I do have the GLUT.framework and
X-Code installed, so I think I'm good there.


On 28/01/06, James Adam <james.adam@gmail.com> wrote:
> In case anyone needs this, I've uploaded my tweaked version of the
> latest rb-opengl bindings to:
>
>   http://www.lazyatom.com/software/opengl-0.32g.tar.gz
>
> You'll need the Developer Tools and probably the GLUT source from
> Apple already installed. Here's the README:
>
> 2005-04-26 :: James Adam <james@lazyatom.com>
> 2006-01-28 :: (Updated to rb-opengl-0.32g)
>
> Ruby-OpenGL Bindings for Mac OS X
> =================================
>
> So basically here's a tweaked version of the original OpenGL module
> for the Mac. To compile, just follow the same instructions as normal:
>
> Build it - don't worry too much about any warnings:
> $ ruby extconf.rb
> $ make
>
> Test it out:
> $ ruby sample/robot.rb
> (press the 'e' and 's' keys to make the "robot" move...)
>
> Install it:
> $ make install
> (or possibly "sudo make install", depending on where your ruby is)
>
>
>
> Changes I've made
> -----------------
>
> extconf.rb:
> Added -framework flags and correct include directories
> Hacked to generate GLUT module even without detection of -lGLUT, since
> mkmf can't deal with the Mac GLUT framework
>
> *.c:
> Edited #includes to use <OpenGL/gl.h> and <GLUT/glut.h>
>
> glut.c:
> I've added the function CheckLoop to the GLUT module in line with the
> same function in Apple's GLUT. GLUT's MainLoop is blocking and forces
> you to perform additoinal processing using GLUT's IdleFunc system,
> which can sometimes be very undesirable (particularly if you are using
> Ruby as the glue between two libraries which both feature this type of
> loop). CheckLoop allows you to cycle through a *single* GLUT
> processing loop, and then returns control to the calling
> thread/process. Thus, by periodically calling CheckLoop, you can get
> the scene to update without having GLUT seize control of the whole
> application.
>
> I've also added calls for Glut.GameModeString(mode_string) and
> Glut.EnterGameMode(), allowing you to switch your application to
> fullscreen.
>
> Finally, a new method GLUT.BitmapCharacterX(char) for displaying
> characters, since there seems to be a problem with the default
> GLUT.BitmapCharacter method.
>
>
> Problems
> --------
>
> For some reason, including the libraries from the command line fails.
> For instance:
>
> $ irb
> irb(main):001:0> require 'opengl'; require 'glut'
> => true
>
> ... works fine, but:
>
> $ irb -r opengl
> /usr/local/lib/ruby/site_ruby/1.8/powerpc-darwin8.0.0/opengl.bundle:
> [BUG] Bus Error
> ruby 1.8.2 (2004-12-25) [powerpc-darwin8.0.0]
>
> Abort trap
>
> ... clearly fails. You can see the discussion of this problem
> (something unfortunately inherent with IRB on the mac) here:
>
>   http://ruby-talk.org/cgi-bin/scat.rb/~poffice/news2/comp.lang.ruby/23917
>
> Or the quick fix, detailed here:
>
>   http://ruby-talk.org/cgi-bin/scat.rb/~poffice/news2/comp.lang.ruby/24004
>
>