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Net: NetTransport seam + Steam transport (Workstream C.1)

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The wire moves behind NetTransport (L4NETTRANSPORT): L4NET.CPP taken
from RP412 post-seam -- all ~24 Winsock call sites route through
NetTransport_Get() -- with BT's 3 BT_NET_TRACE blocks re-sited onto
their code anchors (they read message/packet metadata, not sockets, so
no collision). Default WinsockNetTransport = the arcade/LAN TCP wire.

SteamNetTransport (L4STEAMTRANSPORT, ISteamNetworkingSockets + FakeIP/
SDR) compiles under option(BT412_STEAM) (default OFF); Steamworks SDK
1.64 vendored at extern/steamworks_sdk_164. steam_appid.txt gitignored
(Spacewar 480 by hand until a real AppID). Ported gConsoleLossEndsMission
from RP412's APPMGR (default False = arcade re-listen).

Verified: default TCP build passes full loopback MP through the seam
(console -> egg msgID-3 chunks -> mesh complete -> both instances tick,
net-tx/net-rx traces fire through NetTransport_Get()); BT412_STEAM=ON
compiles + links against the SDK + boots solo. Live Steam session
deferred to Phase 6. (Phase 4 of docs/BT412-ROADMAP.md)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-07-14 08:33:34 -05:00
co-authored by Claude Fable 5
parent 5285117d3b
commit 5ebb9a5906
69 changed files with 34965 additions and 251 deletions
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@@ -87,7 +87,26 @@ pattern). Forked at BT411 `4e72f0c` (2026-07-14).
Prerequisite order when resumed: finish BT's MFD dev-composite (GAUGE_COMPOSITE.md Steps
2–3) → obtain BT cockpit geometry → then hand-merge `MFDSplitView`. Until then the game
ships single-window with the dev-gauge dock (`BT_DEV_GAUGES`) as its cockpit composite.
- Phases 4–7: Phase 4 (NetTransport seam) next — unblocked and independent of 3b.
- **Phase 4 (NetTransport seam + Steam transport) — DONE 2026-07-14.** `L4NET.CPP`
taken from RP412 post-seam (all ~24 Winsock call sites now route through
`NetTransport_Get()`); BT's 3 `BT_NET_TRACE` blocks re-sited onto their code anchors
(the drop path, the point-to-point send before `NetTransport_Get()->Send`, the
pad-buffer receive) — they read message/packet metadata, not sockets, so no
collision. `L4NETTRANSPORT.*` (seam + `WinsockNetTransport` default) and
`L4STEAMTRANSPORT.*` (gate renamed `BT412_STEAM`, self-test env `BT412STEAMSELFTEST`)
copied. `extern/steamworks_sdk_164/` vendored (headers + win32 redistributable_bin).
One engine global ported from RP412's APPMGR: `gConsoleLossEndsMission` (default
False = arcade re-listen; the marshaled/lobby path sets it in Phase 5/6).
CMake: seam always compiled; `option(BT412_STEAM)` (default OFF) gates the transport
define + `sdk/public` include + `steam_api.lib` + post-build `steam_api.dll` copy.
`steam_appid.txt` gitignored (Spacewar 480 by hand until a real AppID).
Verified: (1) default TCP build — loopback MP through the seam is byte-for-byte the
old behavior (console connects, egg msgID-3 chunks delivered, "All connections
completed!", both instances tick, `net-tx`/`net-rx` traces fire through
`NetTransport_Get()`); (2) `BT412_STEAM=ON` config + build (compile-check of the
Steam transport TU against the vendored SDK; a live Steam session needs the Phase 6
lobby + 3 machines).
- Phases 5–7: Phase 5 (front end + LocalConsole marshal) next.
## The seams (what plugs in where) [T0 unless noted]