PFNGLMAPVERTEXATTRIB1DAPPLEPROCDart typedef
        PFNGLMAPVERTEXATTRIB1DAPPLEPROCDart =
     void Function(int index, int size, double u1, double u2, int stride, int order, Pointer<Double>  points)
    
    
    
Implementation
typedef PFNGLMAPVERTEXATTRIB1DAPPLEPROCDart =
    void Function(
      int index,
      int size,
      double u1,
      double u2,
      int stride,
      int order,
      Pointer<Double> points,
    );