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>
The Steam-multiplayer prerequisite from the design doc: L4NET keeps
hosts, message queues, and the deterministic mesh ordering, while
connect/listen/accept/close, send/receive, startup/cleanup, the local
interface list, and ip[:port] parsing move behind NetTransport
(L4NETTRANSPORT.h). WinsockNetTransport carries the existing TCP
behavior over verbatim - including the connect retry-while-refused
loop the egg-ACK ordering relies on - and is the process default;
NetTransport_Set installs a replacement before the network manager
comes up.
L4STEAMTRANSPORT.h documents the ISteamNetworkingSockets mapping
per method (FakeIP keeps [pilots] entries as IPv4 strings) behind
RP412_STEAM until the Steamworks SDK lands.
Also fixed in passing: the ExclusiveBroadcast path sent
sizeof(network_packet) - four bytes of pointer - instead of the
message size, which would have sheared the stream framing had it
ever fired.
Verified: single-player race cycle (menu, race, results, menu, race)
green; -net 8000 boots, listens for a console through the transport,
and idles stable.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5