I tried googling and searching on stack but I didn\'t find anything :-( ( Mapping irregular shapes or other polygons (cartoons, sprites) to triangles in OpenGL ES )
Cocos2D is cool library wrapping OpenGL and has many useful features ( mainly for games but not limited to ).
For polygon tessellation use : http://flipcode.net/archives/Efficient_Polygon_Triangulation.shtml I've used it before and it worked well.