PFNGLFLUSHMAPPEDBUFFERRANGEPROC typedef
        PFNGLFLUSHMAPPEDBUFFERRANGEPROC =
     Void Function(Uint32 target, Pointer<NativeType>  offset, Pointer<Uint32>  length)
    
    
    
Implementation
typedef PFNGLFLUSHMAPPEDBUFFERRANGEPROC =
    Void Function(
      Uint32 target,
      Pointer<NativeType> offset,
      Pointer<Uint32> length,
    );