Core Game Loop Additions

2026-06-03 22:41:27 -07:00
parent 79ff06a7df
commit 8e9b4412ce
70 changed files with 3084 additions and 2 deletions
@@ -0,0 +1,134 @@
+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>
+    /// Server-only resource harvest: sweeps each surviving projectile's this-tick travel segment against
+    /// resource-node ghosts and deposits <see cref="ResourceNode.HarvestPerHit"/> of the node's
+    /// <see cref="ResourceNode.ResourceId"/> into the GLOBAL resource ledger (the CycleDirector's
+    /// <see cref="StorageEntry"/> buffer, resolved via <see cref="ResourceLedger"/> — NEVER
+    /// GetSingleton&lt;StorageEntry&gt;, which would collide with the base storage container). Runs in the plain
+    /// server SimulationSystemGroup <c>[UpdateAfter(PredictedSimulationSystemGroup)]</c> — after
+    /// ProjectileDamageSystem has already consumed Health-target hits and range-expired projectiles, so this
+    /// only sees true survivors. The swept segment is reconstructed from <see cref="Projectile.LastStep"/>
+    /// (written by ProjectileMoveSystem in the fixed-step group), so it is tunnelling-safe WITHOUT depending on
+    /// this plain group's variable-frame DeltaTime. A node hit by two projectiles in one tick deposits twice
+    /// but is destroyed exactly once. Relies on the asserted ~1000-unit base/expedition coordinate gap so a
+    /// base projectile can never geometrically reach an expedition node.
+    /// </summary>
+    [BurstCompile]
+    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
+    [UpdateInGroup(typeof(SimulationSystemGroup))]
+    [UpdateAfter(typeof(PredictedSimulationSystemGroup))]
+    public partial struct ResourceHarvestSystem : ISystem
+    {
+        const float k_ProjectileRadius = 0.2f;
+
+        [BurstCompile]
+        public void OnCreate(ref SystemState state)
+        {
+            state.RequireForUpdate<Projectile>();
+            state.RequireForUpdate<ResourceNode>();
+            state.RequireForUpdate<ResourceLedger>();
+        }
+
+        [BurstCompile]
+        public void OnUpdate(ref SystemState state)
+        {
+            var ledgerEntity = SystemAPI.GetSingletonEntity<ResourceLedger>();
+            var ledger = SystemAPI.GetBuffer<StorageEntry>(ledgerEntity);
+
+            // Snapshot all nodes once this tick.
+            var nodeEntities = new NativeList<Entity>(Allocator.Temp);
+            var nodePos = new NativeList<float2>(Allocator.Temp);
+            var nodeRadius = new NativeList<float>(Allocator.Temp);
+            var nodeRemaining = new NativeList<int>(Allocator.Temp);
+            var nodeResource = new NativeList<byte>(Allocator.Temp);
+            var nodePerHit = new NativeList<float>(Allocator.Temp);
+
+            foreach (var (xform, hr, node, e) in
+                     SystemAPI.Query<RefRO<LocalTransform>, RefRO<HitRadius>, RefRO<ResourceNode>>().WithEntityAccess())
+            {
+                nodeEntities.Add(e);
+                nodePos.Add(xform.ValueRO.Position.xz);
+                nodeRadius.Add(hr.ValueRO.Value);
+                nodeRemaining.Add(node.ValueRO.Remaining);
+                nodeResource.Add(node.ValueRO.ResourceId);
+                nodePerHit.Add(node.ValueRO.HarvestPerHit);
+            }
+
+            var destroyed = new NativeArray<bool>(nodeEntities.Length, Allocator.Temp);
+            var ecb = new EntityCommandBuffer(Allocator.Temp);
+
+            foreach (var (xform, proj, projEntity) in
+                     SystemAPI.Query<RefRO<LocalTransform>, RefRO<Projectile>>().WithEntityAccess())
+            {
+                float3 cur = xform.ValueRO.Position;
+                float2 segEnd = cur.xz;
+                float2 segStart = segEnd - proj.ValueRO.Direction * proj.ValueRO.LastStep;
+                float2 seg = segEnd - segStart;
+                float segLenSq = math.lengthsq(seg);
+
+                int bestIdx = -1;
+                float bestT = float.MaxValue;
+                for (int i = 0; i < nodeEntities.Length; i++)
+                {
+                    if (destroyed[i]) continue;
+                    float2 tp = nodePos[i];
+                    float t = segLenSq > 1e-8f ? math.saturate(math.dot(tp - segStart, seg) / segLenSq) : 0f;
+                    float2 closest = segStart + t * seg;
+                    float hitDist = nodeRadius[i] + k_ProjectileRadius;
+                    if (math.distancesq(tp, closest) <= hitDist * hitDist && t < bestT)
+                    {
+                        bestT = t;
+                        bestIdx = i;
+                    }
+                }
+
+                if (bestIdx < 0)
+                    continue;
+
+                int amount = (int)nodePerHit[bestIdx];
+                StorageMath.Deposit(ledger, nodeResource[bestIdx], amount);
+                int rem = nodeRemaining[bestIdx] - amount;
+                nodeRemaining[bestIdx] = rem;
+                ecb.DestroyEntity(projEntity);
+
+                if (rem <= 0)
+                {
+                    if (!destroyed[bestIdx])
+                    {
+                        destroyed[bestIdx] = true;
+                        ecb.DestroyEntity(nodeEntities[bestIdx]);
+                    }
+                }
+                else
+                {
+                    // Persist the decremented Remaining (replicated GhostField) so depletion carries across ticks.
+                    SystemAPI.SetComponent(nodeEntities[bestIdx], new ResourceNode
+                    {
+                        ResourceId = nodeResource[bestIdx],
+                        Remaining = rem,
+                        HarvestPerHit = nodePerHit[bestIdx],
+                    });
+                }
+            }
+
+            ecb.Playback(state.EntityManager);
+            ecb.Dispose();
+            destroyed.Dispose();
+            nodeEntities.Dispose();
+            nodePos.Dispose();
+            nodeRadius.Dispose();
+            nodeRemaining.Dispose();
+            nodeResource.Dispose();
+            nodePerHit.Dispose();
+        }
+    }
+}