LANTERN P1 step 8: light-as-territory relevancy prototype (★)

Per connection, marks every ENEMY ghost OUTSIDE the player's lamp radius IRRELEVANT (monsters in the dark aren't replicated — the gamma test). Modelled on the proven RegionRelevancySystem: SetIsIrrelevant so players/global ghosts stay relevant for free. Shared-set discipline — RegionRelevancySystem is the SOLE clearer (runs every tick); LightRelevancySystem is [UpdateAfter] it and only ADDs light hides via TryAdd (no clear; defensive against a region+light overlap dup). Gated on GymTag (LANTERN-only; legacy region relevancy untouched). Pure decision in LightRelevancyMath (+3 EditMode tests, 500 green). Per-player dim/bright (variable radius) + the L3 gamma-test verification are follow-ups; the ★adversarial netcode review is recommended before this ships. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-15 08:51:24 -07:00
parent 342a39a540
commit aeb979f8d5
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+using ProjectM.Simulation;
+using Unity.Burst;
+using Unity.Collections;
+using Unity.Entities;
+using Unity.Mathematics;
+using Unity.NetCode;
+using Unity.Transforms;
+
+namespace ProjectM.Server
+{
+    /// <summary>
+    /// LANTERN "light is territory" relevancy prototype (Build Spec Phase 1 step 8): per connection, marks every
+    /// ENEMY ghost OUTSIDE that player's lamp radius IRRELEVANT — so monsters in the dark aren't replicated (the
+    /// gamma test: "nothing to see"). Players + untagged/global ghosts stay relevant for free (SetIsIrrelevant).
+    /// <para>
+    /// SHARED-SET DISCIPLINE: <see cref="RegionRelevancySystem"/> is the SOLE clearer of the <c>GhostRelevancy</c>
+    /// set — its OnUpdate runs every tick (requires only <c>GhostRelevancy</c>), setting the mode + clearing +
+    /// adding its region hides. This system runs <b>[UpdateAfter(RegionRelevancySystem)]</b> and only ADDS light
+    /// hides (never clears) via <c>TryAdd</c> (defensive against a ghost hidden by BOTH region and light for one
+    /// connection — a duplicate <c>Add</c> would throw). Gated on <see cref="GymTag"/> so it runs ONLY in the
+    /// LANTERN gym; the legacy base/expedition game keeps region relevancy alone. Runs in
+    /// <see cref="GhostSimulationSystemGroup"/> before GhostSendSystem reads the set. Per-player dim/bright (a
+    /// variable radius) is the tuning follow-up; the prototype uses <see cref="LightRelevancyMath.LampRadiusDefault"/>.
+    /// </para>
+    /// </summary>
+    [BurstCompile]
+    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
+    [UpdateInGroup(typeof(GhostSimulationSystemGroup))]
+    [UpdateAfter(typeof(RegionRelevancySystem))]
+    public partial struct LightRelevancySystem : ISystem
+    {
+        [BurstCompile]
+        public void OnCreate(ref SystemState state)
+        {
+            state.RequireForUpdate<GhostRelevancy>();
+            state.RequireForUpdate<GymTag>(); // prototype: light-as-territory runs only in the LANTERN gym
+        }
+
+        [BurstCompile]
+        public void OnUpdate(ref SystemState state)
+        {
+            // Each in-game connection's player position (per-player lamp radius = the dim/bright follow-up; fixed here).
+            var connPos = new NativeHashMap<int, float3>(8, Allocator.Temp);
+            foreach (var (owner, lt) in
+                     SystemAPI.Query<RefRO<GhostOwner>, RefRO<LocalTransform>>().WithAll<PlayerTag>())
+                connPos[owner.ValueRO.NetworkId] = lt.ValueRO.Position;
+
+            if (connPos.IsEmpty) { connPos.Dispose(); return; }
+
+            // The set is already mode=SetIsIrrelevant + cleared + region-populated THIS tick by RegionRelevancySystem.
+            ref var relevancy = ref SystemAPI.GetSingletonRW<GhostRelevancy>().ValueRW;
+            var set = relevancy.GhostRelevancySet;
+            var conns = connPos.GetKeyValueArrays(Allocator.Temp);
+
+            float rSq = LightRelevancyMath.LampRadiusDefault * LightRelevancyMath.LampRadiusDefault;
+            foreach (var (ghost, lt) in
+                     SystemAPI.Query<RefRO<GhostInstance>, RefRO<LocalTransform>>().WithAll<EnemyTag>())
+            {
+                int ghostId = ghost.ValueRO.ghostId;
+                if (ghostId == 0) continue; // ghost id not assigned yet this tick
+
+                float3 gp = lt.ValueRO.Position;
+                for (int i = 0; i < conns.Keys.Length; i++)
+                {
+                    if (LightRelevancyMath.IsHidden(conns.Values[i], gp, rSq))
+                        set.TryAdd(new RelevantGhostForConnection { Connection = conns.Keys[i], Ghost = ghostId }, 1);
+                }
+            }
+
+            conns.Dispose();
+            connPos.Dispose();
+        }
+    }
+}
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