Good tutorials

[karrotsrkool]

Hi, starting to use openGL ES I managed to get a triangle on the screen by using this tutorial, http://benosteen.wordpress.com/2012/04/ ... x-windows/ however I would like to start to understand how the drawing works so is there any tutorials that would work for the raspberry pi out there? I ask because there are tonnes for Android and the iPhone but that above tutorial was about all I could find for the pi. Forgive me if this has already been asked and if so could you please redirect me, thank you very much,
Andy A

Edit: As an extra note, I'm using plain C only, no C++ or any other language although other libraries would be fine. This is all in the interest of being as fast as possible.

[ajstarks]

Here's a small library for OpenVG: http://github.com/ajstarks/openvg