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Doors run on the mission clock instead of being replicated

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A door's position was an integrated countdown owned by whichever machine
the map-entity round-robin happened to deal it to. That left doors one
one-way-latency behind on every other machine, re-acquired at each state
change; drifting permanently on any frame hitch over a second, which the
old code dropped outright rather than clamping; and frozen mid-cycle,
collision volumes included, when their owning peer left, since ownership
transfer is not implemented.

Doors are clockwork with no inputs, and door/VTV physics is already local
pointer access - VTV::ProcessCollision reads door->currentVelocity off
the local object and the crush test is local VTV state - so a door does
not need an owner at all. Door::SlideDoor is now a phase function of
Application::GetMissionElapsed(), anchored so phase zero reproduces the
original DefaultState entry: fully open, starting to close. Every host
builds its own doorframe out of the map stream as a HermitInstance, the
instance kind DynamicEntityCreation does not broadcast, so nothing is
sent, nothing is received, and a peer leaving takes no doors with it.

Verified against a copy of the old integrator at 25fps with the real 10s
travel / 3s dead timings: identical 26s cycle, a constant one-frame
offset, and no drift across a 3s stall that leaves the old code
permanently 3 seconds out of phase.

Also fixes a latent bug found on the way: UpdateManager iterates the
dynamic master socket, which holds Independant and Hermit instances as
well as masters, and handed all of them to EntityUpdateReplicants, which
asserts MasterInstance.

Doorframes no longer consume a slot in the map-entity ownership cursor,
which shifts who owns every map entity dealt after them, so this cannot
share a session with an older build. The lobby publishes a simulation
revision and refuses to launch a mixed room.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-08-07 16:25:42 -05:00
co-authored by Claude Opus 5
parent 0e39075a20
commit 6e829f815e
8 changed files with 202 additions and 164 deletions
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MUNGA/UPDATE.cpp
+12 -2
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@@ -168,10 +168,20 @@ void
//
//-----------------------------------------------------------------------
// If update message is not null then send the change
// If update message is not null then send the change.
//
// The dynamic master socket holds Independant and Hermit instances as
// well as masters, and neither of those publishes: an Independant runs
// its own simulation on every host, and a Hermit is not replicated at
// all. EntityUpdateReplicants asserts MasterInstance, so the caller is
// the one that has to make that true - the clockwork doorframes are
// Hermits and would otherwise arrive there.
//-----------------------------------------------------------------------
//
if (update_message != NULL)
if (
update_message != NULL
&& entity->GetInstance() == Entity::MasterInstance
)
{
Check(update_message);