RPL4LOBBY implements the multiplayer front door on ISteamMatchmaking.
The setup menu grows HOST STEAM RACE / JOIN STEAM RACE buttons when
the Steam wire is live; hosting creates a tagged public lobby, joining
finds one. Every member publishes FakeIP + fake ports + persona +
loadout as member data; the room screen lists members (host marked)
and gives the owner a launch button.
Launching writes a nonced go-roster into lobby data. Each pod
registers every peer with the Steam transport (two-port peer table:
engine console/game ports map to Steam fake ports on connect) and
enters the race: the owner through the hosted-race path - it builds
the multi-pilot egg from real personas and loadouts and its console
marshals everyone - and members as network pods that boot straight
into WaitingForEgg for the owner to feed over the wire.
The lobby outlives races: members loop back through WinMain into the
room (no local console needed - MissionCompleted is waived for member
races), and the owner returns to the room after its results screen.
Leaving the lobby clears the hosted-race priming.
Verified on this box: menu buttons appear under RP412STEAM=1, hosting
creates a lobby on the Steam backend, the room runs and leaves back to
the menu; single-player cycling and the LAN hosted race both still
pass. Full three-account mesh test is next, on real hardware.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Steamworks SDK 1.64 vendored at extern/steamworks_sdk_164 (headers +
win32 redistributables only; .gitignore trims the rest). Both projects
build with RP412_STEAM; activation stays behind the RP412STEAM=1
environment switch, so plain desktop runs never touch Steam.
L4STEAMTRANSPORT.cpp implements NetTransport on ISteamNetworkingSockets
with FakeIP: SteamNetTransport_Install brings up SteamAPI, relay
network access, and a two-port FakeIP identity (fake port 0 = console
channel, 1 = game mesh), then swaps the process wire; any failure logs
the reason and the game carries on over TCP. Addressing keeps the
engine untouched: all pods share the -net port convention, eggs carry
fakeip:engineport, and the transport alone translates engine ports to
Steam fake ports via the lobby-fed peer table (RegisterPeer). Connect
mirrors the TCP retry-while-refused loop; Receive normalizes message
lanes back into the stream semantics CheckBuffers expects.
Runtime verified on this box: RP412STEAM=1 under AppID 480 came up as
169.254.59.52 (fake ports 32256/32257); without Steam credentials it
falls back to TCP cleanly; default boot logs no Steam lines at all.
steam_api.dll ships in the dist.
Next: the lobby layer (ISteamMatchmaking member data -> RegisterPeer +
egg build + RPL4CONSOLE marshal), which needs a second account to test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5