Opengl problem (from gears sample)

Ruby
1

I wanted to take a look at ruby’s opengl but I’m having issues – can
you help me out? I installed it and I can require it in irb or a file
without issue:

irb
001:0> require ‘opengl’
true
002:0> include Gl, Glu, Glut
Object

I downloaded the opengl gears demo here:
http://members.shaw.ca/michael.brooks/gears_using_shaders.zip
and this won’t run. It errors out with:
ruby: symbol lookup error:
/usr/lib/ruby/gems/1.9.3dev/gems/ruby-opengl-0.60.1/lib/glut.so:
undefined symbol: STR2CSTR

ruby -v
ruby 1.9.3dev (2010-05-31 trunk 28108) [powerpc64-linux]
gem specification ruby-opengl|grep -1 version
name: ruby-opengl
version: !ruby/object:Gem::Version
prerelease: false

  • 1
    version: 0.60.1
    platform: ruby
    …
    rubyforge_project: ruby-opengl
    rubygems_version: 1.3.7
    signing_key:
    specification_version: 2
    summary: OpenGL Interface for Ruby
2

I wrote:

I downloaded the opengl gears demo here:
Shaw Communications

I’m sorry that’s the wrong gears demo link …

3

Roberto Cm wrote:

I downloaded the opengl gears demo here:
Shaw Communications
and this won’t run. It errors out with:
ruby: symbol lookup error:
/usr/lib/ruby/gems/1.9.3dev/gems/ruby-opengl-0.60.1/lib/glut.so:
undefined symbol: STR2CSTR

Try installing and running it with ruby 1.8.x. The STR2CSTR macro is not
used in 1.9.2, so it looks like someone will have to update the opengl
lib.

4

Joel VanderWerf wrote:

Roberto Cm wrote:

I downloaded the opengl gears demo here:
Shaw Communications
and this won’t run. It errors out with:
ruby: symbol lookup error:
/usr/lib/ruby/gems/1.9.3dev/gems/ruby-opengl-0.60.1/lib/glut.so:
undefined symbol: STR2CSTR

Try installing and running it with ruby 1.8.x. The STR2CSTR macro is not
used in 1.9.2, so it looks like someone will have to update the opengl
lib.
that’s a shame …

I can confirm it does work, although very slowly, in 1.8. thanks