Add gameobject interaction and taxi activation

include/core/application.hpp

@@ -85,6 +85,10 @@ private:
     void despawnOnlineCreature(uint64_t guid);
     void buildCreatureDisplayLookups();
     std::string getModelPathForDisplayId(uint32_t displayId) const;
+    void spawnOnlineGameObject(uint64_t guid, uint32_t displayId, float x, float y, float z, float orientation);
+    void despawnOnlineGameObject(uint64_t guid);
+    void buildGameObjectDisplayLookups();
+    std::string getGameObjectModelPathForDisplayId(uint32_t displayId) const;
 
     static Application* instance;
 
@@ -151,6 +155,20 @@ private:
     std::unordered_map<uint32_t, uint32_t> displayIdModelCache_; // displayId → modelId (model caching)
     uint32_t nextCreatureModelId_ = 5000;  // Model IDs for online creatures
 
+    // Online gameobject model spawning
+    struct GameObjectInstanceInfo {
+        uint32_t modelId = 0;
+        uint32_t instanceId = 0;
+        bool isWmo = false;
+    };
+    std::unordered_map<uint32_t, std::string> gameObjectDisplayIdToPath_;
+    std::unordered_map<uint32_t, uint32_t> gameObjectDisplayIdModelCache_; // displayId → M2 modelId
+    std::unordered_map<uint32_t, uint32_t> gameObjectDisplayIdWmoCache_;   // displayId → WMO modelId
+    std::unordered_map<uint64_t, GameObjectInstanceInfo> gameObjectInstances_; // guid → instance info
+    uint32_t nextGameObjectModelId_ = 20000;
+    uint32_t nextGameObjectWmoModelId_ = 40000;
+    bool gameObjectLookupsBuilt_ = false;
+
     // Mount model tracking
     uint32_t mountInstanceId_ = 0;
     uint32_t mountModelId_ = 0;
@@ -167,6 +185,14 @@ private:
     std::vector<PendingCreatureSpawn> pendingCreatureSpawns_;
     static constexpr int MAX_SPAWNS_PER_FRAME = 2;
     void processCreatureSpawnQueue();
+
+    struct PendingGameObjectSpawn {
+        uint64_t guid;
+        uint32_t displayId;
+        float x, y, z, orientation;
+    };
+    std::vector<PendingGameObjectSpawn> pendingGameObjectSpawns_;
+    void processGameObjectSpawnQueue();
 };
 
 } // namespace core

include/game/game_handler.hpp

@@ -378,6 +378,15 @@ public:
     using CreatureDespawnCallback = std::function<void(uint64_t guid)>;
     void setCreatureDespawnCallback(CreatureDespawnCallback cb) { creatureDespawnCallback_ = std::move(cb); }
 
+    // GameObject spawn callback (online mode - triggered when gameobject enters view)
+    // Parameters: guid, displayId, x, y, z (canonical), orientation
+    using GameObjectSpawnCallback = std::function<void(uint64_t guid, uint32_t displayId, float x, float y, float z, float orientation)>;
+    void setGameObjectSpawnCallback(GameObjectSpawnCallback cb) { gameObjectSpawnCallback_ = std::move(cb); }
+
+    // GameObject despawn callback (online mode - triggered when gameobject leaves view)
+    using GameObjectDespawnCallback = std::function<void(uint64_t guid)>;
+    void setGameObjectDespawnCallback(GameObjectDespawnCallback cb) { gameObjectDespawnCallback_ = std::move(cb); }
+
     // Faction hostility map (populated from FactionTemplate.dbc by Application)
     void setFactionHostileMap(std::unordered_map<uint32_t, bool> map) { factionHostileMap_ = std::move(map); }
 
@@ -417,6 +426,7 @@ public:
 
     // NPC Gossip
     void interactWithNpc(uint64_t guid);
+    void interactWithGameObject(uint64_t guid);
     void selectGossipOption(uint32_t optionId);
     void selectGossipQuest(uint32_t questId);
     void acceptQuest();
@@ -792,6 +802,8 @@ private:
     CreatureSpawnCallback creatureSpawnCallback_;
     CreatureDespawnCallback creatureDespawnCallback_;
     CreatureMoveCallback creatureMoveCallback_;
+    GameObjectSpawnCallback gameObjectSpawnCallback_;
+    GameObjectDespawnCallback gameObjectDespawnCallback_;
     std::vector<uint32_t> knownSpells;
     std::unordered_map<uint32_t, float> spellCooldowns;    // spellId -> remaining seconds
     uint8_t castCount = 0;

include/game/opcodes.hpp

@@ -193,6 +193,9 @@ enum class Opcode : uint16_t {
     SMSG_LOOT_MONEY_NOTIFY           = 0x163,
     SMSG_LOOT_CLEAR_MONEY            = 0x165,
 
+    // ---- Phase 5: Taxi / Flight Paths ----
+    CMSG_ACTIVATETAXI                = 0x19D,
+
     // ---- Phase 5: NPC Gossip ----
     CMSG_GOSSIP_HELLO                = 0x17B,
     CMSG_GOSSIP_SELECT_OPTION        = 0x17C,
@@ -200,6 +203,9 @@ enum class Opcode : uint16_t {
     SMSG_GOSSIP_COMPLETE             = 0x17E,
     SMSG_NPC_TEXT_UPDATE             = 0x180,
 
+    // ---- Phase 5: GameObject ----
+    CMSG_GAMEOBJECT_USE              = 0x01B,
+
     // ---- Phase 5: Quests ----
     CMSG_QUESTGIVER_STATUS_QUERY     = 0x182,
     SMSG_QUESTGIVER_STATUS           = 0x183,

include/game/world_packets.hpp

@@ -1665,8 +1665,10 @@ struct ShowTaxiNodesData {
     uint32_t nearestNode = 0;       // Taxi node player is at
     uint32_t nodeMask[TLK_TAXI_MASK_SIZE] = {};
     bool isNodeKnown(uint32_t nodeId) const {
-        uint32_t idx = nodeId / 32;
-        uint32_t bit = nodeId % 32;
+        if (nodeId == 0) return false;
+        uint32_t bitIndex = nodeId - 1;
+        uint32_t idx = bitIndex / 32;
+        uint32_t bit = bitIndex % 32;
         return idx < TLK_TAXI_MASK_SIZE && (nodeMask[idx] & (1u << bit));
     }
 };
@@ -1694,6 +1696,18 @@ public:
     static network::Packet build(uint64_t npcGuid, const std::vector<uint32_t>& pathNodes);
 };
 
+/** CMSG_ACTIVATETAXI packet builder */
+class ActivateTaxiPacket {
+public:
+    static network::Packet build(uint64_t npcGuid, uint32_t srcNode, uint32_t destNode);
+};
+
+/** CMSG_GAMEOBJECT_USE packet builder */
+class GameObjectUsePacket {
+public:
+    static network::Packet build(uint64_t guid);
+};
+
 /** CMSG_REPOP_REQUEST packet builder */
 class RepopRequestPacket {
 public: