Implement ACTION_T_MOUNT_TO_ENTRY_OR_MODEL (43) for creature eventAI.

Read doc/EventAI.txt for details.
Originally by NoFantasy.

--HG--
branch : trunk

src/server/game/AI/EventAI/CreatureEventAI.cpp

@@ -826,6 +826,28 @@ void CreatureEventAI::ProcessAction(CreatureEventAI_Action const& action, uint32
                 m_InvinceabilityHpLevel = action.invincibility_hp_level.hp_level;
             break;
         }
+        case ACTION_T_MOUNT_TO_ENTRY_OR_MODEL:
+        {
+            if (action.mount.creatureId || action.mount.modelId)
+            {
+                // set model based on entry from creature_template
+                if (action.mount.creatureId)
+                {
+                    if (CreatureInfo const* cInfo = GetCreatureTemplateStore(action.mount.creatureId))
+                    {
+                        uint32 display_id = sObjectMgr.ChooseDisplayId(0, cInfo);
+                        me->Mount(display_id);
+                    }
+                }
+                //if no param1, then use value from param2 (modelId)
+                else
+                    me->Mount(action.mount.modelId);
+            }
+            else
+                me->Unmount();
+
+            break;
+        }
     }
 }
 

src/server/game/AI/EventAI/CreatureEventAI.h

@@ -108,6 +108,7 @@ enum EventAI_ActionType
     ACTION_T_SET_SHEATH                 = 40,               // Sheath (0-passive,1-melee,2-ranged)
     ACTION_T_FORCE_DESPAWN              = 41,               // No Params
     ACTION_T_SET_INVINCIBILITY_HP_LEVEL = 42,               // MinHpValue, format(0-flat,1-percent from max health)
+    ACTION_T_MOUNT_TO_ENTRY_OR_MODEL    = 43,               // Creature_template entry(param1) OR ModelId (param2) (or 0 for both to unmount)
 
     ACTION_T_SET_PHASE_MASK             = 97,
     ACTION_T_SET_STAND_STATE            = 98,
@@ -398,6 +399,12 @@ struct CreatureEventAI_Action
             uint32 hp_level;
             uint32 is_percent;
         } invincibility_hp_level;
+        // ACTION_T_MOUNT_TO_ENTRY_OR_MODEL                 = 43
+        struct
+        {
+            uint32 creatureId;                              // set one from fields (or 0 for both to dismount)
+            uint32 modelId;
+        } mount;
         // RAW
         struct
         {

src/server/game/AI/EventAI/CreatureEventAIMgr.cpp

@@ -672,6 +672,30 @@ void CreatureEventAIMgr::LoadCreatureEventAI_Scripts()
                             }
                         }
                         break;
+                    case ACTION_T_MOUNT_TO_ENTRY_OR_MODEL:
+                        if (action.mount.creatureId != 0 || action.mount.modelId != 0)
+                        {
+                            if (action.mount.creatureId && !sCreatureStorage.LookupEntry<CreatureInfo>(action.mount.creatureId))
+                            {
+                                sLog.outErrorDb("CreatureEventAI:  Event %u Action %u uses nonexistent Creature entry %u.", i, j+1, action.mount.creatureId);
+                                action.morph.creatureId = 0;
+                            }
+
+                            if (action.mount.modelId)
+                            {
+                                if (action.mount.creatureId)
+                                {
+                                    sLog.outErrorDb("CreatureEventAI:  Event %u Action %u have unused ModelId %u with also set creature id %u.", i, j+1, action.mount.modelId, action.mount.creatureId);
+                                    action.mount.modelId = 0;
+                                }
+                                else if (!sCreatureDisplayInfoStore.LookupEntry(action.mount.modelId))
+                                {
+                                    sLog.outErrorDb("CreatureEventAI:  Event %u Action %u uses nonexistent ModelId %u.", i, j+1, action.mount.modelId);
+                                    action.mount.modelId = 0;
+                                }
+                            }
+                        }
+                        break;
                     case ACTION_T_EVADE:                    //No Params
                     case ACTION_T_FLEE_FOR_ASSIST:          //No Params
                     case ACTION_T_DIE:                      //No Params