103 lines
4.2 KiB
C#
103 lines
4.2 KiB
C#
using System.Collections.Generic;
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using Unity.Collections;
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using UnityEngine;
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using UnityEngine.Jobs;
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using BaseGames.Core;
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namespace BaseGames.Enemies.AI
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{
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/// <summary>
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/// 批量视线检测系统（架构 07_EnemyModule §12）。
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/// 每 FixedUpdate：
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/// 1. 读取上一帧 RaycastHit2D 结果，回调各注册者。
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/// 2. 重新构建本帧 RaycastCommand 批次，使用 Physics2D.RaycastAll 同步模式执行。
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///
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/// ⚠️ Unity 2022.3 中 Physics2D 批量命令（RaycastCommand2D）尚未稳定，
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/// 此实现使用 FixedUpdate 内顺序 Raycast2D（节流），确保零 GC 分配。
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/// 当敌人数量 > 20 时建议切换到 Job System RaycastCommand。
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/// </summary>
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[DefaultExecutionOrder(-200)]
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public class BatchLOSSystem : MonoBehaviour
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{
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[SerializeField, Min(1)] private int _maxRequestersPerFrame = 8;
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private void Awake() => ServiceLocator.Register<BatchLOSSystem>(this);
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private void OnDestroy() => ServiceLocator.Unregister<BatchLOSSystem>(this);
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private readonly List<ILOSRequester> _requesters = new();
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private readonly HashSet<ILOSRequester> _requesterSet = new(); // O(1) 包含查询
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// _indexMap 记录每个 requester 在 _requesters 中的下标，供 Unregister 实现 O(1) 删除
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private readonly Dictionary<ILOSRequester, int> _indexMap = new();
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private int _currentOffset = 0;
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// ── 注册 ──────────────────────────────────────────────────────────
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public void Register(ILOSRequester requester)
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{
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if (_requesterSet.Add(requester))
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{
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_indexMap[requester] = _requesters.Count;
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_requesters.Add(requester);
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}
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}
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public void Unregister(ILOSRequester requester)
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{
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if (!_requesterSet.Remove(requester)) return;
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int idx = _indexMap[requester];
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int last = _requesters.Count - 1;
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// Swap-and-pop：将末尾元素移动到被删除的位置，避免 O(n) 搬移
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if (idx != last)
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{
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var moved = _requesters[last];
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_requesters[idx] = moved;
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_indexMap[moved] = idx;
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}
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_requesters.RemoveAt(last);
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_indexMap.Remove(requester);
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// 修正偏移量，防止越界
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if (_currentOffset >= _requesters.Count) _currentOffset = 0;
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}
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// ── FixedUpdate ───────────────────────────────────────────────────
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private void FixedUpdate()
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{
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if (_requesters.Count == 0) return;
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// 每帧轮询部分请求者（均匀分配，避免单帧全量射线）
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int count = Mathf.Min(_maxRequestersPerFrame, _requesters.Count);
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for (int i = 0; i < count; i++)
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{
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int idx = (_currentOffset + i) % _requesters.Count;
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var requester = _requesters[idx];
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bool hasLOS = false;
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if (requester != null)
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{
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Vector2 origin = requester.LOSOrigin;
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Vector2 target = requester.LOSTarget;
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Vector2 direction = target - origin;
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float distance = direction.magnitude;
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if (distance > 0.01f)
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{
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// direction / distance == direction.normalized，避免重复开方
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var hit = Physics2D.Raycast(origin, direction / distance, distance, requester.LOSBlockingMask);
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// 若无遮挡物（hit.collider == null），则视线畅通
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hasLOS = hit.collider == null;
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}
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requester.ReceiveLOSResult(hasLOS);
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}
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}
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_currentOffset = (_currentOffset + count) % Mathf.Max(1, _requesters.Count);
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}
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}
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}
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