The prior commit (c78662a) filed cross-pod damage failure under a
"cross-TU Entity/EntityID layout divergence" (and the P5 base-region
audit). A compile-time offsetof probe injected into BOTH translation
units disproves that: game/reconstructed AND engine/MUNGA compute an
IDENTICAL Entity layout --
sizeof(Entity)=444 offsetof(entityID)=380 (0x17C)
offsetof(ownerID)=388 offsetof(simulationFlags)=32
offsetof(Mech,entityID)=380 (Entity subobject at 0)
So Entity::Dispatch reads this->entityID at the SAME offset mech4's
GetEntityID() does -- there is no per-TU read difference, and the
logged 3:22 (mech4 candidate) vs 3:19 (engine Dispatch) cannot be one
object read two ways. Those lines were different objects/messages,
mis-correlated. The distinct, REAL P5 "base-region layout divergence"
(HARD_PROBLEMS.md) is about raw-offset stomps at this+0x2d4..0x2f0 --
far above entityID -- and is unrelated to #47.
Changes:
- Revert the committed BT_MP_NET engine diagnostics (ENTITY/EVENT/
NTTMGR/RECEIVER/L4NET) to the clean a9c3e96 baseline -- those are
the very instruments that produced the mis-correlated data.
- mech4 BT_MP_FORCE_DMG hook: dispatch via the real m->Dispatch(&td)
path (no false id stamping); comment records the offsetof finding.
- context/multiplayer.md: layout-divergence RULED OUT; 3:22/3:19 marked
unconfirmed; leading hypotheses reframed as H2 (wire host-relative
(de)serialization) vs H3 (replicant id != master's registered key),
to be distinguished by a 2-node run with per-message correlation.
Solo un-regressed (mech walks + targets, 0 faults). Cross-pod delivery
remains open, but the investigation is redirected off the wrong (large,
structural) layout-audit path onto the EntityID wire/id-assignment path.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Traced the dispatched-message delivery end to end with BT_MP_NET /
BT_MP_FORCE_DMG. Everything works except one wire step:
- A's Entity::Dispatch reroutes the replicant's TakeDamage
(application->SendMessage(ownerID=3, EntityManager, msg)); POST-Dispatch
the message carries entityID=3:22 (host:local) -- the replicant's own
ID, matching B's master (GetEntityID()==3:22). VERIFIED sent.
- On B the message ARRIVES, GetEntityPointer finds an entity, Posts it,
the event drains (ProcessEventTask = ProcessOneEvent(0)), Event::Process
runs, Receive finds+calls a handler. VERIFIED the full deliver chain.
- BUG: B receives entityID=3:19, NOT 3:22 -- the localID dropped by
exactly the hostID (3) between A's send and B's receive. So
GetEntityPointer(3:19) returns the WRONG entity (classID 48, not the
mech 0xBB9), whose base handler ignores the unaimed hit -> 0 damage.
Auto-replicated UPDATE records (msgID 18) arrive with the correct 3:22
and find the mech, so the corruption is specific to the dispatched-
message wire path/direction.
Next: the host-relative EntityID (de)serialization on the dispatched-msg
path (RoutePacket / packet EntityID encoding) -- diff vs the update path
which translates correctly. Diagnostics retained (all BT_MP_NET-gated,
off in solo -- verified: solo 22 hits, 0 probe noise).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
STEP 1 -- target any peer mech: DONE + verified. A live-mech registry
(BTRegisterMech/BTDeregisterMech from the Mech ctor/dtor) collects
every mech -- player, dummy, and peer replicants. The boresight
world-pick walks BTGetTargetCandidates (all mechs != shooter, closest
ray hit) and the whole fire/damage block retargets from the solo
gEnemyMech to the picked hotTarget; missile/projectile validation
generalised via BTIsRegisteredMech. Verified one-box: instance A
enumerates B's mech as a live ReplicantInstance (20 zones, ownerID=3).
Solo un-regressed (pick->damage->kill clean, 28 hits + DESTROYED).
STEP 2 -- cross-pod damage: dispatch + engine reroute are CORRECT and
invoked with a valid owner, but the dispatched message doesn't reach
the master. Entity::Dispatch (ENTITY.cpp:244) reroutes a replicant's
msg via application->SendMessage(ownerID,...); BT_MP_FORCE_DMG proves A
dispatches at B's replicant with ownerID=3, yet B takes 0 STEP-6
damage. Corrects the KB's [T3] "Dispatch already reroutes": the reroute
FIRES; the break is downstream in the transport/delivery of a
dispatched entity-message (update records flow fine -- net-rx works).
Next MP task = that wire delivery. Diagnostics BT_MP_LOG /
BT_MP_FORCE_DMG retained.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
One-box smoke test re-run on the current build: console egg -> mesh ->
RunningMission both instances, 174+ x144-byte update records each side,
2 mech trees per instance, 0 crashes (~6 min). The movement-replication
milestone is intact after all the targeting/weapon/death changes.
Gap map to a first playable LAN fight recorded in
context/multiplayer.md (wiring order): (1) generalize the world-pick
from gEnemyMech to all peer mechs; (2) exercise the Dispatch reroute
for cross-pod TakeDamage; (3) victim state visuals on the shooter's
screen (zone replication or a death event); (4) cross-pod beam visuals
via the AUTHENTIC beam-keepalive messages (FUN_0041c350, templates
@0x511e6c/78 -- already stubbed in emitter.cpp); (5) 2-window driving +
DEATHS scoring; respawn deferred to the P5 teardown debt.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
