PFNGLBUFFERSTORAGEEXTERNALEXTPROC typedef
        PFNGLBUFFERSTORAGEEXTERNALEXTPROC =
     Void Function(Uint32 target, Pointer<NativeType>  offset, Pointer<Uint32>  size, Pointer<NativeType>  clientBuffer, Uint32 flags)
    
    
    
Implementation
typedef PFNGLBUFFERSTORAGEEXTERNALEXTPROC =
    Void Function(
      Uint32 target,
      Pointer<NativeType> offset,
      Pointer<Uint32> size,
      Pointer<NativeType> clientBuffer,
      Uint32 flags,
    );