mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Alex Vanderveen
34 lines
1.2 KiB
Markdown
34 lines
1.2 KiB
Markdown
# Netplay topology (locked decisions)
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| Decision | Choice |
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|----------|--------|
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| Online transport | Lobby UDP **SFU star** (`recomp-net-server` input relay) |
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| Mesh | **No** — peers never dial each other online |
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| Sim authority | Pad **slot 0** = session host (`START`, state xfer) |
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| Seat moves | Guests rearrange among seats **1..N−1**; host stays at 0 |
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| Seat ceiling | **8** (`RNET_MAX_SLOTS`, lobby `MAX_SLOTS`, PSX dual multitap) |
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## Paths
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```text
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Online (WebSocket lobby)
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every peer ──UDP──► lobby SFU ──fan-out──► other seats
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WS still carries lobby JSON + ICE signaling (ICE unused for match data)
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LAN / Direct IP (no WS start)
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2P: P2P UDP
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3+: host-as-relay LAN hub (local star; game host fans out)
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```
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## Per-title players
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- Framework / UI / net library ceiling: **8**
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- `game.toml` `players` / `MAX_PLAYERS` may be lower (MotK=2, Bomberman=5)
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- `PSX_MAX_PLAYERS == 8` enables dual SCPH-1070 (ports 1+2 → pads 0–7)
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- Single multitap (5–7) keeps `multitap_port` (Bomberman Port 2)
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## Follow-ups (not in this pass)
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- N-way `hash_confirm` / FRAME_COMMIT agreement for rollback at N>2
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- Validate 5P Bomberman over SFU + rollback host facade parity with MotK
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