Overview
RollbackNet brings deterministic rollback networking to Unreal via a port of GGPO. You drive synchronization through the GGPO game-instance layer; a small helper library validates and builds endpoints.
Fork note The UE wrapper module
GGPOUE was renamed to RollbackNet for UE 4.27–5.0+; the GGPO library and its classes were kept as the underlying netcode. Missing C++ standard includes and a struct-init issue were fixed so it builds under 4.27–5.0+/MSVC.Requirements
| Requirement | Details |
|---|---|
| Unreal Engine | 4.27–5.0+ |
| Language | Blueprints and/or C++ |
| Platforms | Win64 |
Installation
- Copy the
RollbackNetfolder into your project'sPlugins/directory. - C++ projects: regenerate project files and build. Blueprint-only projects can launch the editor directly.
- Open Edit → Plugins and confirm RollbackNet is enabled.
Helpers (RollbackNet Library)
| Node | Type | Description |
|---|---|---|
| Is Valid Network Endpoint | Pure | Validate a host:port endpoint. |
| Make Network Endpoint | Pure | Build a host:port string (clamped port). |
| Is RollbackNet Logging Enabled | Pure | Reads the project logging setting. |
Notes
Windows-only The GGPO source and network layer use Win32 APIs; the runtime is currently Win64-only.
Utility node pack
General-purpose networking utilities added to URollbackNetLibrary — available from Blueprints and C++.
| Node | Type | Description |
|---|---|---|
| CRC32 Of Bytes | Pure | CRC32 checksum of a byte array. |
| MD5 Of String / SHA1 Of String | Pure | Hex digests of a UTF-8 string. |
| Make Guid String | Pure | New random GUID (hyphenated). |
| Now Unix Seconds | Pure | Current UTC time as Unix seconds. |
| Unix Seconds To ISO8601 | Pure | Unix seconds → ISO-8601 UTC string. |
| Format Byte Size | Pure | Human-readable size, e.g. 1536 → 1.5 KB. |
| Random Token | Pure | Random alphanumeric token (ids, nonces). |
| XOR Bytes With Key | Pure | XOR bytes with a repeating key (obfuscation, not encryption). |
| Is Valid Hostname | Pure | RFC-952/1123-style hostname validation. |
Credits
© Alpha XP — alphaxp.net. Developed and maintained for UE 4.27–5.0+.