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feat(L.2g-S1): retail movement-event staleness gate (DEV-6)

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Port retail's three-stamp inbound gate for 0xF74C UpdateMotion:

- MotionSequenceGate (Core/Physics): CPhysicsObj::is_newer (0x00451ad0)
  wraparound u16 compare, verbatim per ACE PhysicsObj.is_newer (the BN
  pseudo-C setcc returns are garbled; ACE + branch structure are the
  oracle). Gates: INSTANCE_TS at dispatch (stale incarnation drops
  before any stamp is touched), MOVEMENT_TS strictly-newer (stamped
  BEFORE the server-control check, per CPhysics::SetObjectMovement
  0x00509690), SERVER_CONTROLLED_MOVE_TS drop-when-stored-newer.
- Seed from CreateObject's PhysicsDesc timestamp block (index 1 =
  ObjectMovement now parsed; ACE WorldObject_Networking.cs:411-420
  order) — without seeding, entities whose movement sequence is past
  0x8000 at spawn would drop every UM against a zero stamp.
  Adopt-on-first / advance-only-after, so the #138 rehydrate replay of
  retained spawns cannot regress live stamps.
- UpdateMotion + EntitySpawn now carry instance/movement/serverControl
  sequences + isAutonomous (was parsed-past; isAutonomous feeds the
  S2 funnel's last_move_was_autonomous). Gate wired at the top of
  OnLiveMotionUpdated before any state mutation; [UM_STALE] diag under
  ACDREAM_DUMP_MOTION / ACDREAM_REMOTE_VEL_DIAG; gate dropped with the
  entity on DeleteObject.

Register: AD-32 added (adopt-newer-incarnation instead of retail's
QueueBlobForObject); TS-26 updated (UM side closed, UP side open).
Deviation map: docs/research/2026-07-02-inbound-motion-deviation-map.md.

19 new gate tests + parser coverage; full suite 3276 green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-07-02 15:44:06 +02:00
parent fb3ee0544a
commit cb74e64343
9 changed files with 464 additions and 18 deletions
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31
tests/AcDream.Core.Net.Tests/Messages/UpdateMotionTests.cs
View file

@ -303,6 +303,37 @@ public class UpdateMotionTests
Assert.Equal(1.25f, result.Value.MotionState.ForwardSpeed);
}
[Fact]
public void ParsesSequenceNumbersAndAutonomyFlag()
{
// L.2g S1 (DEV-6): the three staleness stamps + autonomy flag must
// survive parsing — retail gates every 0xF74C on them
// (INSTANCE_TS at dispatch, MOVEMENT_TS + SERVER_CONTROLLED_MOVE_TS
// in CPhysics::SetObjectMovement 0x00509690, which also stores
// last_move_was_autonomous).
var body = new byte[4 + 4 + 2 + 6 + 4 + 4];
int p = 0;
BinaryPrimitives.WriteUInt32LittleEndian(body.AsSpan(p), 0xF74Cu); p += 4;
BinaryPrimitives.WriteUInt32LittleEndian(body.AsSpan(p), 0x50001234u); p += 4;
BinaryPrimitives.WriteUInt16LittleEndian(body.AsSpan(p), 0x0102); p += 2; // instanceSeq
BinaryPrimitives.WriteUInt16LittleEndian(body.AsSpan(p), 0x0304); p += 2; // movementSeq
BinaryPrimitives.WriteUInt16LittleEndian(body.AsSpan(p), 0x0506); p += 2; // serverControlSeq
body[p++] = 1; // isAutonomous
p += 1; // Align(4) pad
body[p++] = 0; // movementType = Invalid
body[p++] = 0; // motionFlags
BinaryPrimitives.WriteUInt16LittleEndian(body.AsSpan(p), 0x003D); p += 2; // outer stance
BinaryPrimitives.WriteUInt32LittleEndian(body.AsSpan(p), 0u); p += 4; // no IMS flags
var result = UpdateMotion.TryParse(body);
Assert.NotNull(result);
Assert.Equal((ushort)0x0102, result!.Value.InstanceSequence);
Assert.Equal((ushort)0x0304, result.Value.MovementSequence);
Assert.Equal((ushort)0x0506, result.Value.ServerControlSequence);
Assert.True(result.Value.IsAutonomous);
}
[Fact]
public void ParsesMoveToObjectTargetGuidAndOrigin()
{