Core/Maps: implement LIQUID_MAP_OCEAN_FLOOR to identify units that are on the bottom of a liquid

Port From (https://github.com/TrinityCore/TrinityCore/commit/97af0c31af13de23eabe4eb22ed3e71dd5602531)

Source/Framework/Constants/MapConst.cs

@@ -121,6 +121,7 @@ namespace Framework.Constants
         WaterWalk = 0x02,
         InWater = 0x04,
         UnderWater = 0x08,
+        OceanFloor = 0x10,
 
         Swimming = InWater | UnderWater,
         InContact = Swimming | WaterWalk

Source/Game/Entities/Unit/Unit.Movement.cs

@@ -21,21 +21,31 @@ namespace Game.Entities
         {
             return m_movementInfo.HasMovementFlag(MovementFlag.DisableGravity);
         }
+
         public bool IsWalking()
         {
             return m_movementInfo.HasMovementFlag(MovementFlag.Walking);
         }
+
         public bool IsHovering() { return m_movementInfo.HasMovementFlag(MovementFlag.Hover); }
+
         public bool IsStopped() { return !HasUnitState(UnitState.Moving); }
+
         public bool IsMoving() { return m_movementInfo.HasMovementFlag(MovementFlag.MaskMoving); }
+
         public bool IsTurning() { return m_movementInfo.HasMovementFlag(MovementFlag.MaskTurning); }
+
         public virtual bool CanFly() { return false; }
+
         public bool IsFlying() { return m_movementInfo.HasMovementFlag(MovementFlag.Flying | MovementFlag.DisableGravity); }
+
         public bool IsFalling()
         {
             return m_movementInfo.HasMovementFlag(MovementFlag.Falling | MovementFlag.FallingFar) || MoveSpline.IsFalling();
         }
+
         public virtual bool CanEnterWater() { return false; }
+
         public virtual bool CanSwim()
         {
             // Mirror client behavior, if this method returns false then client will not use swimming animation and for players will apply gravity as if there was no water
@@ -50,15 +60,22 @@ namespace Game.Entities
 
             return HasUnitFlag(UnitFlags.Rename | UnitFlags.CanSwim);
         }
+
         public bool IsInWater()
         {
             return GetLiquidStatus().HasAnyFlag(ZLiquidStatus.InWater | ZLiquidStatus.UnderWater);
         }
+
         public bool IsUnderWater()
         {
             return GetLiquidStatus().HasFlag(ZLiquidStatus.UnderWater);
         }
 
+        public bool IsOnOceanFloor()
+        {
+            return GetLiquidStatus().HasFlag(ZLiquidStatus.OceanFloor);
+        }
+
         void PropagateSpeedChange() { GetMotionMaster().PropagateSpeedChange(); }
 
         public float GetSpeed(UnitMoveType mtype)

Source/Game/Maps/GridMap.cs

@@ -598,14 +598,20 @@ namespace Game.Maps
             // For speed check as int values
             float delta = liquid_level - z;
 
+            ZLiquidStatus status = ZLiquidStatus.AboveWater; // Above water
+
             if (delta > collisionHeight)                   // Under water
-                return ZLiquidStatus.UnderWater;
+                status = ZLiquidStatus.UnderWater;
             if (delta > 0.0f)                   // In water
-                return ZLiquidStatus.InWater;
+                status = ZLiquidStatus.InWater;
             if (delta > -0.1f)                   // Walk on water
-                return ZLiquidStatus.WaterWalk;
-            // Above water
-            return ZLiquidStatus.AboveWater;
+                status = ZLiquidStatus.WaterWalk;
+
+            if (status != ZLiquidStatus.AboveWater)
+                if (MathF.Abs(ground_level - z) <= MapConst.GroundHeightTolerance)
+                    status |= ZLiquidStatus.OceanFloor;
+
+            return status;
         }
 
         public float GetHeight(float x, float y) { return _gridGetHeight(x, y); }

Source/Game/Maps/TerrainManager.cs

@@ -551,14 +551,19 @@ namespace Game.Maps
                 data.LiquidInfo.type_flags = (LiquidHeaderTypeFlags)(1 << (int)liquidFlagType);
 
                 float delta = wmoData.liquidInfo.Value.Level - z;
+                ZLiquidStatus status = ZLiquidStatus.AboveWater;
                 if (delta > collisionHeight)
-                    data.LiquidStatus = ZLiquidStatus.UnderWater;
+                    status = ZLiquidStatus.UnderWater;
                 else if (delta > 0.0f)
-                    data.LiquidStatus = ZLiquidStatus.InWater;
+                    status = ZLiquidStatus.InWater;
                 else if (delta > -0.1f)
-                    data.LiquidStatus = ZLiquidStatus.WaterWalk;
-                else
-                    data.LiquidStatus = ZLiquidStatus.AboveWater;
+                    status = ZLiquidStatus.WaterWalk;
+
+                if (status != ZLiquidStatus.AboveWater)
+                    if (MathF.Abs(wmoData.floorZ - z) <= MapConst.GroundHeightTolerance)
+                        status |= ZLiquidStatus.OceanFloor;
+
+                data.LiquidStatus = status;
             }
             // look up liquid data from grid map
             if (gmap != null && useGridLiquid)
@@ -636,13 +641,23 @@ namespace Game.Maps
 
                     float delta = liquid_level - z;
 
-                    // Get position delta
+                    ZLiquidStatus status = ZLiquidStatus.AboveWater; // Above water
+
                     if (delta > collisionHeight)                   // Under water
-                        return ZLiquidStatus.UnderWater;
+                        status = ZLiquidStatus.UnderWater;
                     if (delta > 0.0f)                   // In water
-                        return ZLiquidStatus.InWater;
+                        status = ZLiquidStatus.InWater;
                     if (delta > -0.1f)                   // Walk on water
-                        return ZLiquidStatus.WaterWalk;
+                        status = ZLiquidStatus.WaterWalk;
+
+                    if (status != ZLiquidStatus.AboveWater)
+                    {
+                        if (MathF.Abs(ground_level - z) <= MapConst.GroundHeightTolerance)
+                            status |= ZLiquidStatus.OceanFloor;
+
+                        return status;
+                    }
+
                     result = ZLiquidStatus.AboveWater;
                 }
             }