refactor(gameplay): update systems per entity with chunk check

Refactor server entity update flow to process entities individually,
skipping those whose chunk is not loaded. System update methods now
accept a single entity instead of iterating the full registry view,
and `ServerWorld::get_chunk_ref_count` is added to determine if an
entity's chunk is active.

include/Cubed/gameplay/server_entity_manager.hpp

@@ -44,9 +44,10 @@ private:
     void handle_entity_destory(EntityID id);
     void handle_task();
     void send_all_entities(std::shared_ptr<Session>& session);
-    void update_ai();
-    void update_move();
-    void update_send();
+    void update_ai(entt::entity e);
+    void update_move(entt::entity e);
+    void update_send(entt::entity e,
+                     std::span<std::shared_ptr<Session>> sessions);
     template <typename... Args>
     EntityID create_entity_in_factory(Args&&... args) {
         auto entity = m_registry.create();

include/Cubed/gameplay/server_world.hpp

@@ -94,6 +94,8 @@ public:
 
     std::vector<std::shared_ptr<Session>> get_all_session() const;
 
+    uint32_t get_chunk_ref_count(const glm::vec3& pos) const;
+
     int get_block(const glm::ivec3& block_pos) const override;
     bool is_solid(const glm::ivec3& block_pos) const override;
     bool can_pass_block(const glm::ivec3& block_pos) const override;

include/Cubed/gameplay/systems/physical_system.hpp

@@ -8,7 +8,8 @@ class PhysicalSystem {
 public:
     static glm::vec3 get_move_distance(const TickVelocity& v);
 
-    static void update(ServerWorld& world, entt::registry& registry);
+    static void update(ServerWorld& world, entt::registry& registry,
+                       entt::entity e);
 
 private:
 };

include/Cubed/gameplay/systems/speed_system.hpp

@@ -4,7 +4,7 @@
 namespace Cubed {
 class SpeedSystem {
 public:
-    static void update(float dt, entt::registry& registry);
+    static void update(float dt, entt::registry& registry, entt::entity e);
 
 private:
 };

include/Cubed/gameplay/systems/wander_ai_system.hpp

@@ -6,7 +6,7 @@
 namespace Cubed {
 class WanderAISystem {
 public:
-    static void update(entt::registry& registry);
+    static void update(entt::registry& registry, entt::entity e);
 
 private:
     static void do_ai(BaseServerCreature& creature, MoveBoost& move_boost);

src/gameplay/server_entity_manager.cpp

@@ -31,26 +31,40 @@ void ServerEntityManager::init() {
 }
 void ServerEntityManager::update() {
     handle_task();
-    update_ai();
-    update_move();
 
-    update_send();
-}
-
-void ServerEntityManager::update_ai() { WanderAISystem::update(m_registry); }
-
-void ServerEntityManager::update_move() {
-    SpeedSystem::update(
-        static_cast<float>(m_world.get_per_tick_time()) / 1000.0f, m_registry);
-    PhysicalSystem::update(m_world, m_registry);
-}
-
-void ServerEntityManager::update_send() {
+    auto view = m_registry.view<BaseServerCreature>();
     auto sessions = m_world.get_all_session();
-    auto view = m_registry.view<Entity, BaseServerCreature>();
+    for (auto e : view) {
+        const auto& c = view.get<BaseServerCreature>(e);
+        if (!m_world.get_chunk_ref_count(c.transform.position.value)) {
+            continue;
+        }
+        update_ai(e);
+        update_move(e);
+        update_send(e, sessions);
+    }
+}
 
-    for (auto& e : view) {
-        auto [entity, creature] = view.get<Entity, BaseServerCreature>(e);
+void ServerEntityManager::update_ai(entt::entity e) {
+    WanderAISystem::update(m_registry, e);
+}
+
+void ServerEntityManager::update_move(entt::entity e) {
+    SpeedSystem::update(static_cast<float>(m_world.get_per_tick_time()) /
+                            1000.0f,
+                        m_registry, e);
+    PhysicalSystem::update(m_world, m_registry, e);
+}
+
+void ServerEntityManager::update_send(
+    entt::entity e, std::span<std::shared_ptr<Session>> sessions) {
+
+    if (!m_registry.all_of<Entity, BaseServerCreature>(e)) {
+        return;
+    }
+
+    const auto [entity, creature] =
+        m_registry.get<Entity, BaseServerCreature>(e);
     Arena arena;
     auto* p = Arena::Create<S2CEntityUpdate>(&arena);
     p->set_id(entity.id);
@@ -63,7 +77,6 @@ void ServerEntityManager::update_send() {
         s->send(make_packet(p));
     }
 }
-}
 
 void ServerEntityManager::handle_task() {
     TaskPair pair;

src/gameplay/server_world.cpp

@@ -1020,6 +1020,15 @@ std::vector<std::shared_ptr<Session>> ServerWorld::get_all_session() const {
     return sessions;
 }
 
+uint32_t ServerWorld::get_chunk_ref_count(const glm::vec3& pos) const {
+    ChunkPos p = get_chunk_pos(pos.x, pos.z);
+    chunk_cacc cacc;
+    if (!m_chunks.find(cacc, p)) {
+        return 0;
+    }
+    return cacc->second.ref_count;
+}
+
 int ServerWorld::get_block(const glm::ivec3& block_pos) const {
     auto [chunk_x, chunk_z] = get_chunk_pos(block_pos.x, block_pos.z);
     chunk_cacc cacc;

src/gameplay/systems/physical_system.cpp

@@ -102,17 +102,19 @@ bool update_z(const glm::vec3& pos, const glm::vec3& distance,
 
 } // namespace
 
-void PhysicalSystem::update(ServerWorld& world, entt::registry& registry) {
+void PhysicalSystem::update(ServerWorld& world, entt::registry& registry,
+                            entt::entity e) {
 
-    auto view = registry.view<BaseServerCreature>();
-    for (auto e : view) {
-        auto& creature = view.get<BaseServerCreature>(e);
+    if (!registry.all_of<BaseServerCreature>(e)) {
+        return;
+    }
+
+    auto& creature = registry.get<BaseServerCreature>(e);
     auto distance = get_move_distance(creature.velocity);
     auto box = HitboxManager::hitbox(creature.hitbox);
     auto& pos = creature.transform.position.value;
     auto& v = creature.velocity;
-        bool ground =
-            !update_y(pos, glm::vec3{0.0f, -0.1f, 0.0f}, world, box.box);
+    bool ground = !update_y(pos, glm::vec3{0.0f, -0.1f, 0.0f}, world, box.box);
     bool stepped = false;
     if (update_y(pos, distance, world, box.box)) {
         pos.y += distance.y;
@@ -159,7 +161,6 @@ void PhysicalSystem::update(ServerWorld& world, entt::registry& registry) {
         }
     }
 }
-}
 
 glm::vec3 PhysicalSystem::get_move_distance(const TickVelocity& v) {
     return v.value; // Per-tick forward distance equals the velocity magnitud

src/gameplay/systems/speed_system.cpp

@@ -5,16 +5,17 @@
 
 namespace Cubed {
 
-void SpeedSystem::update(float dt, entt::registry& registry) {
-    auto view = registry.view<BaseServerCreature, MoveBoost>();
+void SpeedSystem::update(float dt, entt::registry& registry, entt::entity e) {
+    if (!registry.all_of<BaseServerCreature, MoveBoost>(e)) {
+        return;
+    }
 
-    for (auto e : view) {
-        auto [creature, moveboost] = view.get<BaseServerCreature, MoveBoost>(e);
+    auto [creature, moveboost] = registry.get<BaseServerCreature, MoveBoost>(e);
     auto& v = creature.velocity.value;
     if (moveboost.count <= moveboost.duration) {
         ++moveboost.count;
-            v += creature.transform.direction.value *
-                 creature.movement.acceleration;
+        v +=
+            creature.transform.direction.value * creature.movement.acceleration;
     } else {
         // Decelerated by friction in all directions
         auto decay = [](float& c, float d) {
@@ -37,6 +38,5 @@ void SpeedSystem::update(float dt, entt::registry& registry) {
     v_clamp(v.y, creature.velocity.max.y);
     v_clamp(v.z, creature.velocity.max.z);
 }
-}
 
 } // namespace Cubed

src/gameplay/systems/wander_ai_system.cpp

@@ -10,20 +10,20 @@ constexpr double MOVE_PROBABILITY = 0.01;
 } // namespace
 
 namespace Cubed {
-void WanderAISystem::update(entt::registry& registry) {
-    auto view =
-        registry.view<AIBase, WanderAITag, BaseServerCreature, MoveBoost>();
+void WanderAISystem::update(entt::registry& registry, entt::entity e) {
+    if (!registry.all_of<AIBase, WanderAITag, BaseServerCreature, MoveBoost>(
+            e)) {
+        return;
+    }
 
-    for (auto e : view) {
     auto [ai, creature, move_boost] =
-            view.get<AIBase, BaseServerCreature, MoveBoost>(e);
+        registry.get<AIBase, BaseServerCreature, MoveBoost>(e);
     ++ai.count;
     if (ai.count >= ai.interval) {
         ai.count = 0;
         do_ai(creature, move_boost);
     }
 }
-}
 
 void WanderAISystem::do_ai(BaseServerCreature& creature,
                            MoveBoost& move_boost) {