I finally got my Pi late last week - woo! After some initial playing around, I've been working on getting OpenGL working with Ruby, and have put together an initial implementation of Ruby FFI bindings to the Pi's OpenGL libraries, along with a port of the hello_triangle example. Good news is, it all seems to be working well so far: my hello_triangle.rb port is working as per the C version and happily rendering the spinning cube
If you're interested check out the git repo:
https://github.com/LichP/raspi-opengl
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Phil Stewart