PFNGLTRANSFORMFEEDBACKVARYINGSNVPROCDart typedef
        PFNGLTRANSFORMFEEDBACKVARYINGSNVPROCDart =
     void Function(int program, int count, Pointer<Int32>  locations, int bufferMode)
    
    
    
Implementation
typedef PFNGLTRANSFORMFEEDBACKVARYINGSNVPROCDart =
    void Function(
      int program,
      int count,
      Pointer<Int32> locations,
      int bufferMode,
    );