From: brabuhr@...
Date: 2010-01-15T06:38:06+09:00
Subject: Re: 3D with Ruby (Ogre ?)

>> I used the the gears.rb as the basis for a OpenGL programmable shader (i.e.
>> GLSL) version of the gears program.  The intro to it and download can be
>> found through here:
>>
>> http://osdir.com/ml/ruby-talk/2009-03/msg00749.html
>
> FWIW this does nt work for me on Linux.
>
> $ ruby gears_using_shaders.rb
> Error - The program has terminated because the environment does not
> support OpenGL 2.0 or greater GLSL shaders.

"To run GLSL you need the GL_ARB_shading_language_100 extension."[1]

On my system:

$ glxinfo | fgrep shading
    GL_ARB_shadow, GL_ARB_shader_objects, GL_ARB_shading_language_100,

[1] http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=253236