[ruby-opengl-devel] dynamic loading + fixes

[Jan Dvorak]

Hello,

here's another patch:
- dynamic loading of opengl functions above 1.1, 
  should work on linux, mac os X 10.1+, windows, and all systems using GLX in 
general.
- re-added the four 1.2 functions from original code - glDrawRangeElements, 
glTexImage3D, glTexSubImage3D, glCopyTexSubImage3D
- some fixes to the 1.0/1.1 funcs
- glGetTexImage implemented
- glGetPointerv now returns also feedback and selection buffers

As for near future i'm planing implementing the rest of the 1.2 functions, 
writing some more documentation about using the bindings (differences between 
C and ruby usage), and also writing some tests to ensure everything's working 
before implementing 1.3 and beyond.

Jan
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