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feat(A.5 T8): WorldEntity AABB cache + dirty flag

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Adds AabbMin/AabbMax (per-entity world-space bounding box) and AabbDirty
flag to WorldEntity. RefreshAabb() recomputes the box from Position ±5 m
(DefaultAabbRadius). SetPosition() writes Position and marks the cache
dirty so the dispatcher calls RefreshAabb on first read rather than
carrying stale bounds.

AabbDirty defaults to true on construction — freshly-built entities have
zero AabbMin/AabbMax until RefreshAabb is called. Two new conformance tests
verify the ±5 m geometry and the dirty/clean state machine.

Per Phase A.5 spec §4.6 Change #2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-09 22:54:25 +02:00
parent 295bce9bb2
commit a0741bd13a
2 changed files with 71 additions and 0 deletions
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24
src/AcDream.Core/World/WorldEntity.cs
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@ -71,6 +71,30 @@ public sealed class WorldEntity
/// present. Zero (no parts hidden) is the default.
/// </summary>
public ulong HiddenPartsMask { get; init; }
// Per Phase A.5 spec §4.6 Change #2 — cache per-entity AABB so the
// dispatcher's frustum cull is a memory read, not a per-frame recompute.
// AabbDirty starts true so the dispatcher calls RefreshAabb on first read
// (AabbMin/AabbMax are Vector3.Zero until refreshed).
public Vector3 AabbMin { get; private set; }
public Vector3 AabbMax { get; private set; }
public bool AabbDirty { get; private set; } = true;
private const float DefaultAabbRadius = 5.0f;
public void RefreshAabb()
{
var p = Position;
AabbMin = new Vector3(p.X - DefaultAabbRadius, p.Y - DefaultAabbRadius, p.Z - DefaultAabbRadius);
AabbMax = new Vector3(p.X + DefaultAabbRadius, p.Y + DefaultAabbRadius, p.Z + DefaultAabbRadius);
AabbDirty = false;
}
public void SetPosition(Vector3 pos)
{
Position = pos;
AabbDirty = true;
}
}
/// <summary>