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