Implement onNewExterior to spawn fish in generated exteriors

apps/openmw/mwbase/luamanager.hpp

@@ -11,6 +11,7 @@
 
 namespace MWWorld
 {
+    class CellStore;
     class Ptr;
 }
 
@@ -47,6 +48,7 @@ namespace MWBase
         virtual void objectRemovedFromScene(const MWWorld::Ptr& ptr) = 0;
         virtual void itemConsumed(const MWWorld::Ptr& consumable, const MWWorld::Ptr& actor) = 0;
         virtual void objectActivated(const MWWorld::Ptr& object, const MWWorld::Ptr& actor) = 0;
+        virtual void exteriorCreated(MWWorld::CellStore& cell) = 0;
         // TODO: notify LuaManager about other events
         // virtual void objectOnHit(const MWWorld::Ptr &ptr, float damage, bool ishealth, const MWWorld::Ptr &object,
         //                          const MWWorld::Ptr &attacker, const osg::Vec3f &hitPosition, bool successful) = 0;

apps/openmw/mwlua/engineevents.cpp

@@ -71,6 +71,8 @@ namespace MWLua
                 scripts->onConsume(LObject(consumable));
         }
 
+        void operator()(const OnNewExterior& event) const { mGlobalScripts.onNewExterior(GCell{ &event.mCell }); }
+
     private:
         MWWorld::Ptr getPtr(const ESM::RefNum& id) const
         {

apps/openmw/mwlua/engineevents.hpp

@@ -5,6 +5,8 @@
 
 #include <components/esm3/cellref.hpp> // defines RefNum that is used as a unique id
 
+#include "../mwworld/cellstore.hpp"
+
 namespace MWLua
 {
     class GlobalScripts;
@@ -38,7 +40,11 @@ namespace MWLua
             ESM::RefNum mActor;
             ESM::RefNum mConsumable;
         };
-        using Event = std::variant<OnNewGame, OnActive, OnInactive, OnConsume, OnActivate>;
+        struct OnNewExterior
+        {
+            MWWorld::CellStore& mCell;
+        };
+        using Event = std::variant<OnNewGame, OnActive, OnInactive, OnConsume, OnActivate, OnNewExterior>;
 
         void clear() { mQueue.clear(); }
         void addToQueue(Event e) { mQueue.push_back(std::move(e)); }

apps/openmw/mwlua/globalscripts.hpp

@@ -20,7 +20,7 @@ namespace MWLua
             : LuaUtil::ScriptsContainer(lua, "Global")
         {
             registerEngineHandlers({ &mObjectActiveHandlers, &mActorActiveHandlers, &mItemActiveHandlers,
-                &mNewGameHandlers, &mPlayerAddedHandlers, &mOnActivateHandlers });
+                &mNewGameHandlers, &mPlayerAddedHandlers, &mOnActivateHandlers, &mOnNewExteriorHandlers });
         }
 
         void newGameStarted() { callEngineHandlers(mNewGameHandlers); }
@@ -32,6 +32,7 @@ namespace MWLua
         {
             callEngineHandlers(mOnActivateHandlers, obj, actor);
         }
+        void onNewExterior(const GCell& cell) { callEngineHandlers(mOnNewExteriorHandlers, cell); }
 
     private:
         EngineHandlerList mObjectActiveHandlers{ "onObjectActive" };
@@ -40,6 +41,7 @@ namespace MWLua
         EngineHandlerList mNewGameHandlers{ "onNewGame" };
         EngineHandlerList mPlayerAddedHandlers{ "onPlayerAdded" };
         EngineHandlerList mOnActivateHandlers{ "onActivate" };
+        EngineHandlerList mOnNewExteriorHandlers{ "onNewExterior" };
     };
 
 }

apps/openmw/mwlua/luamanagerimp.hpp

@@ -71,6 +71,10 @@ namespace MWLua
         {
             mEngineEvents.addToQueue(EngineEvents::OnActivate{ getId(actor), getId(object) });
         }
+        void exteriorCreated(MWWorld::CellStore& cell) override
+        {
+            mEngineEvents.addToQueue(EngineEvents::OnNewExterior{ cell });
+        }
 
         MWBase::LuaManager::ActorControls* getActorControls(const MWWorld::Ptr&) const override;
 

apps/openmw/mwworld/worldmodel.cpp

@@ -19,6 +19,9 @@
 #include "cellstore.hpp"
 #include "esmstore.hpp"
 
+#include "../mwbase/environment.hpp"
+#include "../mwbase/luamanager.hpp"
+
 namespace MWWorld
 {
     namespace
@@ -55,7 +58,7 @@ namespace MWWorld
             return store.insert(record);
         }
 
-        Cell createExteriorCell(ESM::ExteriorCellLocation location, ESMStore& store)
+        std::tuple<Cell, bool> createExteriorCell(ESM::ExteriorCellLocation location, ESMStore& store)
         {
             if (ESM::isEsm4Ext(location.mWorldspace))
             {
@@ -63,17 +66,19 @@ namespace MWWorld
                     throw std::runtime_error(
                         "Exterior ESM4 world is not found: " + location.mWorldspace.toDebugString());
                 const ESM4::Cell* cell = store.get<ESM4::Cell>().searchExterior(location);
-                if (cell == nullptr)
+                bool created = cell == nullptr;
+                if (created)
                     cell = createEsm4Cell(location, store);
                 assert(cell != nullptr);
-                return MWWorld::Cell(*cell);
+                return { MWWorld::Cell(*cell), created };
             }
 
             const ESM::Cell* cell = store.get<ESM::Cell>().search(location.mX, location.mY);
-            if (cell == nullptr)
+            bool created = cell == nullptr;
+            if (created)
                 cell = createEsmCell(location, store);
             assert(cell != nullptr);
-            return Cell(*cell);
+            return { Cell(*cell), created };
         }
 
         std::optional<Cell> createCell(ESM::RefId id, const ESMStore& store)
@@ -165,10 +170,12 @@ namespace MWWorld
 
         if (it == mExteriors.end())
         {
-            Cell cell = createExteriorCell(location, mStore);
+            auto [cell, created] = createExteriorCell(location, mStore);
             const ESM::RefId id = cell.getId();
             cellStore = &emplaceCellStore(id, std::move(cell), mStore, mReaders, mCells);
             mExteriors.emplace(location, cellStore);
+            if (created)
+                MWBase::Environment::get().getLuaManager()->exteriorCreated(*cellStore);
         }
         else
         {

files/data/CMakeLists.txt

@@ -65,6 +65,7 @@ set(BUILTIN_DATA_FILES
 
     scripts/omw/activationhandlers.lua
     scripts/omw/ai.lua
+    scripts/omw/cellhandlers.lua
     scripts/omw/camera/camera.lua
     scripts/omw/camera/head_bobbing.lua
     scripts/omw/camera/third_person.lua

files/data/builtin.omwscripts

@@ -7,6 +7,7 @@ PLAYER: scripts/omw/settings/player.lua
 
 # Mechanics
 GLOBAL: scripts/omw/activationhandlers.lua
+GLOBAL: scripts/omw/cellhandlers.lua
 PLAYER: scripts/omw/mechanics/playercontroller.lua
 PLAYER: scripts/omw/playercontrols.lua
 PLAYER: scripts/omw/camera/camera.lua

files/data/scripts/omw/cellhandlers.lua

@@ -0,0 +1,69 @@
+local types = require('openmw.types')
+local util = require('openmw.util')
+local world = require('openmw.world')
+
+local CELL_SIZE = 8192
+
+local function getRandomPosition(cellX, cellY)
+    local x = math.random(7892)
+    local y = math.random(7892)
+    local z = -math.random(1748)
+    return util.vector3(cellX + x, cellY + y, z)
+end
+
+local function getRandomOffset()
+    local x = math.random(1000)
+    local y = math.random(1000)
+    local z = math.random(1000)
+    local v = util.vector3(x, y, z)
+    return v:normalize() * 100
+end
+
+local function getPlayerLevel()
+    for i, actor in pairs(world.activeActors) do
+        if (types.Player.objectIsInstance(actor)) then
+            return types.Player.stats.level(actor).current
+        end
+    end
+end
+
+local function spawnFish(cell)
+    if (cell.worldSpaceId ~= 'sys::default') then
+        return
+    end
+    local spawnCount = math.random(0, 10)
+    if (spawnCount < 1) then
+        return
+    end
+    local list = types.LevelledCreature.record('h2o_all_lev-2')
+    if (list == nil) then
+        return
+    end
+    local cellX = cell.gridX * CELL_SIZE
+    local cellY = cell.gridY * CELL_SIZE
+    local level = getPlayerLevel()
+    if (spawnCount <= 5) then -- spawn a number of random creatures selected from the list
+        while(spawnCount > 0) do
+            local id = list:getRandomId(level)
+            if (id ~= '') then
+                local ref = world.createObject(id)
+                ref:teleport(cell, getRandomPosition(cellX, cellY))
+            end
+            spawnCount = spawnCount - 1
+        end
+    else -- spawn a horde of a single creature selected from the list
+        local id = list:getRandomId(level)
+        if (id ~= '') then
+            local basePos = getRandomPosition(cellX, cellY)
+            while(spawnCount > 0) do
+                local ref = world.createObject(id)
+                ref:teleport(cell, basePos + getRandomOffset())
+                spawnCount = spawnCount - 1
+            end
+        end
+    end
+end
+
+return {
+    engineHandlers = { onNewExterior = spawnFish }
+}