PFNGLCOLOR3FVERTEX3FSUNPROCDart typedef
        PFNGLCOLOR3FVERTEX3FSUNPROCDart =
     void Function(double r, double g, double b, double x, double y, double z)
    
    
    
Implementation
typedef PFNGLCOLOR3FVERTEX3FSUNPROCDart =
    void Function(double r, double g, double b, double x, double y, double z);