PFNGLGETVERTEXATTRIBPOINTERVPROCDart typedef
        PFNGLGETVERTEXATTRIBPOINTERVPROCDart =
     void Function(int index, int pname, Pointer<Pointer<NativeType> >  pointer)
    
    
    
Implementation
typedef PFNGLGETVERTEXATTRIBPOINTERVPROCDart =
    void Function(int index, int pname, Pointer<Pointer<NativeType>> pointer);