PFNGLTEXCOORD2FVERTEX3FSUNPROCDart typedef
        PFNGLTEXCOORD2FVERTEX3FSUNPROCDart =
     void Function(double s, double t, double x, double y, double z)
    
    
    
Implementation
typedef PFNGLTEXCOORD2FVERTEX3FSUNPROCDart =
    void Function(double s, double t, double x, double y, double z);