OpenGL 1.0 to 2.0 Triangle Fan

Hello there!

I’m currently following this cocos2d tutorial series and I found out that this is OpenGL 1.0. The problem is libgdx uses OpenGL 2.0, there is no glEnableClientState and glDisableClientState. Can any one tell me the equivalent for OpenGL 2.0 or any tutorial about this or triangle fan?

Thanks!