[General] Record and get player positions before their last cell change

apps/openmw-mp/Script/Functions/Positions.cpp

@@ -45,6 +45,30 @@ double PositionFunctions::GetPosZ(unsigned short pid) noexcept
     return player->position.pos[2];
 }
 
+double PositionFunctions::GetPreviousCellPosX(unsigned short pid) noexcept
+{
+    Player *player;
+    GET_PLAYER(pid, player, 0.0f);
+
+    return player->previousCellPosition.pos[0];
+}
+
+double PositionFunctions::GetPreviousCellPosY(unsigned short pid) noexcept
+{
+    Player *player;
+    GET_PLAYER(pid, player, 0.0f);
+
+    return player->previousCellPosition.pos[1];
+}
+
+double PositionFunctions::GetPreviousCellPosZ(unsigned short pid) noexcept
+{
+    Player *player;
+    GET_PLAYER(pid, player, 0.0f);
+
+    return player->previousCellPosition.pos[2];
+}
+
 void PositionFunctions::GetRot(unsigned short pid, float *x, float *y, float *z) noexcept
 {
     *x = 0.00;

apps/openmw-mp/Script/Functions/Positions.hpp

@@ -9,6 +9,10 @@
     {"GetPosY",             PositionFunctions::GetPosY},\
     {"GetPosZ",             PositionFunctions::GetPosZ},\
     \
+    {"GetPreviousCellPosX", PositionFunctions::GetPreviousCellPosX},\
+    {"GetPreviousCellPosY", PositionFunctions::GetPreviousCellPosY},\
+    {"GetPreviousCellPosZ", PositionFunctions::GetPreviousCellPosZ},\    
+    \
     {"GetRot",              PositionFunctions::GetRot},\
     {"GetRotX",             PositionFunctions::GetRotX},\
     {"GetRotZ",             PositionFunctions::GetRotZ},\
@@ -59,6 +63,30 @@ public:
     */
     static double GetPosZ(unsigned short pid) noexcept;
 
+    /**
+    * \brief Get the X position of a player from before their latest cell change.
+    *
+    * \param pid The player ID.
+    * \return The X position.
+    */
+    static double GetPreviousCellPosX(unsigned short pid) noexcept;
+
+    /**
+    * \brief Get the Y position of a player from before their latest cell change.
+    *
+    * \param pid The player ID.
+    * \return The Y position.
+    */
+    static double GetPreviousCellPosY(unsigned short pid) noexcept;
+
+    /**
+    * \brief Get the Z position of a player from before their latest cell change.
+    *
+    * \param pid The player ID.
+    * \return The Z position.
+    */
+    static double GetPreviousCellPosZ(unsigned short pid) noexcept;
+
     /**
     * \brief Assign the player's rotational coordinate values to the variables passed as
     * parameters.

apps/openmw/mwmp/LocalPlayer.cpp

@@ -375,6 +375,7 @@ void LocalPlayer::updateCell(bool forceUpdate)
         }
 
         cell = *ptrCell;
+        previousCellPosition = position;
 
         // Make sure the position is updated before a cell packet is sent, or else
         // cell change events in server scripts will have the wrong player position

components/openmw-mp/Base/BasePlayer.hpp

@@ -235,6 +235,7 @@ namespace mwmp
 
         ESM::Position position;
         ESM::Position direction;
+        ESM::Position previousCellPosition;
         ESM::Cell cell;
         ESM::NPC npc;
         ESM::NpcStats npcStats;

components/openmw-mp/Packets/Player/PacketPlayerCellChange.cpp

@@ -20,6 +20,8 @@ void mwmp::PacketPlayerCellChange::Packet(RakNet::BitStream *bs, bool send)
     RW(player->cell.mData, send, 1);
     RW(player->cell.mName, send, 1);
 
+    RW(player->previousCellPosition.pos, send, 1);
+
     RW(player->isChangingRegion, send);
 
     if (player->isChangingRegion)