PFNGLVERTEXPOINTERVINTELPROCDart typedef
        PFNGLVERTEXPOINTERVINTELPROCDart =
     void Function(int size, int type, Pointer<Pointer<NativeType> >  pointer)
    
    
    
Implementation
typedef PFNGLVERTEXPOINTERVINTELPROCDart =
    void Function(int size, int type, Pointer<Pointer<NativeType>> pointer);