PFNGLTRANSFORMFEEDBACKVARYINGSEXTPROC typedef
        PFNGLTRANSFORMFEEDBACKVARYINGSEXTPROC =
     Void Function(Uint32 program, Uint32 count, Pointer<Pointer<Int8> >  varyings, Uint32 bufferMode)
    
    
    
Implementation
typedef PFNGLTRANSFORMFEEDBACKVARYINGSEXTPROC =
    Void Function(
      Uint32 program,
      Uint32 count,
      Pointer<Pointer<Int8>> varyings,
      Uint32 bufferMode,
    );