PFNGLGETVERTEXARRAYPOINTERVEXTPROCDart typedef
        PFNGLGETVERTEXARRAYPOINTERVEXTPROCDart =
     void Function(int vaobj, int pname, Pointer<Pointer<NativeType> >  param)
    
    
    
Implementation
typedef PFNGLGETVERTEXARRAYPOINTERVEXTPROCDart =
    void Function(int vaobj, int pname, Pointer<Pointer<NativeType>> param);