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## BulletManager — 子弹管理器 Autoload（GDScript 接口层）
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## 热路径由 C# BulletManagerCs 子节点驱动。
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## 权威来源：architecture_design.md §4.2
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##
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## SoA 完整布局（BULLET_STRIDE=12）：
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## [ x, y, vx, vy, lifetime, radius, base_damage, damage_mult, damage_type, owner_id, source_tags, acceleration ]
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## 0 1 2 3 4 5 6 7 8 9 10 11
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## 冷数据（pierce/bounce/homing/payload_id）→ _bullet_contexts: Dictionary
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extends Node
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const BULLET_STRIDE: int = 12 # 禁止裸整数 12（跨切片约束）
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const MAX_BULLETS: int = 2048 # 预分配 SoA 大小
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# SoA 热数组（由 BulletManagerCs 直接读写）
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var _data: PackedFloat32Array = PackedFloat32Array()
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var _active_count: int = 0
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# 冷数据（非热路径）
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var _bullet_contexts: Dictionary = {}
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# 敌人位置快照（homing 共用，由 _physics_process 帧头建立）
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var _enemy_pos_snapshot: PackedVector2Array = PackedVector2Array()
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var _cs_node: Node = null
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func _ready() -> void:
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_data.resize(MAX_BULLETS * BULLET_STRIDE)
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_data.fill(0.0)
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func _physics_process(delta: float) -> void:
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EnemyManager.fill_pos_snapshot(_enemy_pos_snapshot)
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if not _cs_node:
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_gd_integrate(delta)
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# GDScript 回退路径（C# 未就绪时 / S0/S1 基线验证）
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func _gd_integrate(delta: float) -> void:
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var i: int = 0
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while i < _active_count:
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var base: int = i * BULLET_STRIDE
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_data[base + 0] += _data[base + 2] * delta # x += vx * dt
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_data[base + 1] += _data[base + 3] * delta # y += vy * dt
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_data[base + 2] += _data[base + 11] * delta # vx += accel * dt
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_data[base + 3] += _data[base + 11] * delta # vy += accel * dt
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_data[base + 4] -= delta # lifetime -= dt
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if _data[base + 4] <= 0.0:
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_swap_and_pop(i)
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elif _check_collision(i, base):
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# 命中处理已在 _check_collision 内完成，子弹被回收
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pass # _active_count 已减少，i 不递增
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else:
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i += 1
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# S1 碰撞检测：数据驱动，使用 SpatialGrid 查询
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# 命中后扣血；pierce_remaining=0 时回收子弹；返回 true 表示子弹已被回收
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func _check_collision(bullet_idx: int, base: int) -> bool:
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var bx: float = _data[base + 0]
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var by: float = _data[base + 1]
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var br: float = _data[base + 5] # bullet radius
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var b_dmg: float = _data[base + 6] # base_damage
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var b_mult: float = _data[base + 7] # damage_mult
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var b_type: int = int(_data[base + 8])
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var b_own: int = int(_data[base + 9])
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var query_r: float = br + 16.0 # 16px = 敌人碰撞体估算半径
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var hits: PackedInt32Array = SpatialGrid.query_circle(Vector2(bx, by), query_r)
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if hits.is_empty():
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return false
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for entity_id in hits:
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var ene_pos: Vector2 = EnemyManager.get_pos_by_id(entity_id)
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if ene_pos == Vector2(-9999.0, -9999.0):
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continue
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var dx: float = bx - ene_pos.x
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var dy: float = by - ene_pos.y
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var dist_sq: float = dx * dx + dy * dy
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if dist_sq > query_r * query_r:
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continue
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# 命中：通过 DamageContextPool 发出伤害
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var ctx_id: int = DamageContextPool.acquire(b_dmg, b_mult, b_type, b_own, false, 0.0)
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EnemyManager.apply_damage_from_context(entity_id, ctx_id)
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DamageContextPool.release(ctx_id)
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var hit_pos: Vector2 = EnemyManager.get_pos_by_id(entity_id)
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if hit_pos == Vector2(-9999.0, -9999.0):
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hit_pos = Vector2(bx, by)
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VFXManager.play("hit_spark", hit_pos)
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EventBus.emit(EventID.BULLET_HIT, {"bullet_id": bullet_idx, "target_id": entity_id, "hit_pos": hit_pos})
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# S4: 命中施加状态 / 连击标记
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var cold: Dictionary = _bullet_contexts.get(bullet_idx, {})
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var status_id: int = int(cold.get("apply_status_id", -1))
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if status_id > 0:
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StatusManager.apply(entity_id, status_id, 1, -1.0, b_own)
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if cold.get("apply_combo_mark", false):
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StatusManager.apply(entity_id, StatusID.COMBO_MARK, 1, 2.0, b_own)
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# S3: 命中触发子荷载
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var payload_id: int = int(cold.get("on_hit_payload_id", -1))
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if payload_id >= 0:
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var parent_depth: int = int(cold.get("trigger_parent_depth", 0))
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SpellEvaluator.execute_sub(payload_id, hit_pos, b_own, parent_depth + 1)
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# pierce 处理
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var pierce: int = int(cold.get("pierce_remaining", 0))
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if pierce > 0:
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cold["pierce_remaining"] = pierce - 1
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_bullet_contexts[bullet_idx] = cold
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return false # 穿透：子弹继续飞行
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_swap_and_pop(bullet_idx)
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return true # 子弹已回收
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return false
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func _swap_and_pop(idx: int) -> void:
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var last: int = _active_count - 1
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if idx != last:
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var base_idx: int = idx * BULLET_STRIDE
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var base_last: int = last * BULLET_STRIDE
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for s in BULLET_STRIDE:
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_data[base_idx + s] = _data[base_last + s]
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if _bullet_contexts.has(last):
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_bullet_contexts[idx] = _bullet_contexts[last]
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_bullet_contexts.erase(last)
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elif _bullet_contexts.has(idx):
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_bullet_contexts.erase(idx)
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_active_count -= 1
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# ── 对外接口 ─────────────────────────────────────────────────────
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## 生成子弹，返回 bullet_id（比 -1 表示满容）
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## 参数附带冷数据：cold_data = {"on_hit_payload_id": int, "pierce_remaining": int, ...}
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func spawn_bullet(pos: Vector2, vel: Vector2, lifetime: float, radius: float,
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base_damage: float, damage_mult: float, damage_type: int,
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owner_id: int, source_tags: int = 0, acceleration: float = 0.0,
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cold_data: Dictionary = {}) -> int:
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if _active_count >= MAX_BULLETS:
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return -1
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var bullet_id: int = _active_count
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var base: int = bullet_id * BULLET_STRIDE
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_data[base + 0] = pos.x
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_data[base + 1] = pos.y
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_data[base + 2] = vel.x
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_data[base + 3] = vel.y
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_data[base + 4] = lifetime
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_data[base + 5] = radius
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_data[base + 6] = base_damage
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_data[base + 7] = damage_mult
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_data[base + 8] = float(damage_type)
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_data[base + 9] = float(owner_id)
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_data[base + 10] = float(source_tags)
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_data[base + 11] = acceleration
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if not cold_data.is_empty():
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_bullet_contexts[bullet_id] = cold_data
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_active_count += 1
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return bullet_id
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## 提前回收：lifetime 置 0；C# 下帧 SoA 清理
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func despawn_bullet(bullet_id: int) -> void:
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if bullet_id < 0 or bullet_id >= _active_count:
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return
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_data[bullet_id * BULLET_STRIDE + 4] = 0.0 # slot +4: lifetime
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func get_active_count() -> int:
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return _active_count
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## 渲染：将活跃子弹的 SoA 位置批量写入 MultiMesh（§4.4，SoA 索引 ↔ instance 索引共享）
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## visible_instance_count 控制渲染数量，避免每帧重分配 instance_count
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func sync_multimesh(mm: MultiMesh) -> void:
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if mm == null:
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return
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var n: int = min(_active_count, mm.instance_count)
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mm.visible_instance_count = n
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for i in n:
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var base: int = i * BULLET_STRIDE
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var r: float = _data[base + 5]
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mm.set_instance_transform_2d(i, Transform2D(
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0.0, Vector2(r * 2.0, r * 2.0), 0.0,
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Vector2(_data[base + 0], _data[base + 1])))
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func get_nearest_enemy_pos(origin: Vector2, max_dist: float = 9999.0) -> Vector2:
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return EnemyManager.get_nearest_pos(origin, max_dist)
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func reset() -> void:
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_active_count = 0
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_data.fill(0.0)
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_bullet_contexts.clear()
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