Implement script region check

src/main/java/emu/grasscutter/game/entity/GameEntity.java

@@ -34,6 +34,10 @@ public abstract class GameEntity {
 		return this.id;
 	}
 	
+	public int getEntityType() {
+		return getId() >> 24;
+	}
+	
 	public World getWorld() {
 		return this.getScene().getWorld();
 	}

src/main/java/emu/grasscutter/game/world/Scene.java

@@ -508,6 +508,7 @@ public class Scene {
 			}
 			
 			group.triggers.forEach(getScriptManager()::registerTrigger);
+			group.regions.forEach(getScriptManager()::registerRegion);
 		}
 		
 		// Spawn gadgets AFTER triggers are added
@@ -526,6 +527,7 @@ public class Scene {
 		
 		for (SceneGroup group : block.groups) {
 			group.triggers.forEach(getScriptManager()::deregisterTrigger);
+			group.regions.forEach(getScriptManager()::deregisterRegion);
 		}
 	}
 	

src/main/java/emu/grasscutter/scripts/SceneScriptManager.java

@@ -35,6 +35,7 @@ import emu.grasscutter.scripts.data.SceneGadget;
 import emu.grasscutter.scripts.data.SceneGroup;
 import emu.grasscutter.scripts.data.SceneInitConfig;
 import emu.grasscutter.scripts.data.SceneMonster;
+import emu.grasscutter.scripts.data.SceneRegion;
 import emu.grasscutter.scripts.data.SceneSuite;
 import emu.grasscutter.scripts.data.SceneTrigger;
 import emu.grasscutter.scripts.data.SceneVar;
@@ -51,14 +52,17 @@ public class SceneScriptManager {
 	private Bindings bindings;
 	private SceneConfig config;
 	private List<SceneBlock> blocks;
-	private Int2ObjectOpenHashMap<Set<SceneTrigger>> triggers;
 	private boolean isInit;
 	
+	private final Int2ObjectOpenHashMap<Set<SceneTrigger>> triggers;
+	private final Int2ObjectOpenHashMap<SceneRegion> regions;
+	
 	public SceneScriptManager(Scene scene) {
 		this.scene = scene;
 		this.scriptLib = new ScriptLib(this);
 		this.scriptLibLua = CoerceJavaToLua.coerce(this.scriptLib);
 		this.triggers = new Int2ObjectOpenHashMap<>();
+		this.regions = new Int2ObjectOpenHashMap<>();
 		this.variables = new HashMap<>();
 		
 		// TEMPORARY
@@ -110,6 +114,18 @@ public class SceneScriptManager {
 		getTriggersByEvent(trigger.event).remove(trigger);
 	}
 	
+	public SceneRegion getRegionById(int id) {
+		return regions.get(id);
+	}
+	
+	public void registerRegion(SceneRegion region) {
+		regions.put(region.config_id, region);
+	}
+	
+	public void deregisterRegion(SceneRegion region) {
+		regions.remove(region.config_id);
+	}
+	
 	// TODO optimize
 	public SceneGroup getGroupById(int groupId) {
 		for (SceneBlock block : this.getScene().getLoadedBlocks()) {
@@ -210,6 +226,7 @@ public class SceneScriptManager {
 			group.gadgets = ScriptLoader.getSerializer().toList(SceneGadget.class, bindings.get("gadgets"));
 			group.triggers = ScriptLoader.getSerializer().toList(SceneTrigger.class, bindings.get("triggers"));
 			group.suites = ScriptLoader.getSerializer().toList(SceneSuite.class, bindings.get("suites"));
+			group.regions = ScriptLoader.getSerializer().toList(SceneRegion.class, bindings.get("regions"));
 			group.init_config = ScriptLoader.getSerializer().toObject(SceneInitConfig.class, bindings.get("init_config"));
 			
 			// Add variables to suite
@@ -234,11 +251,27 @@ public class SceneScriptManager {
 	}
 
 	public void onTick() {
-		checkTriggers();
+		checkRegions();
 	}
 	
-	public void checkTriggers() {
+	public void checkRegions() {
+		if (this.regions.size() == 0) {
+			return;
+		}
 		
+		for (SceneRegion region : this.regions.values()) {
+			getScene().getEntities().values()
+				.stream()
+				.filter(e -> e.getEntityType() <= 2 && region.contains(e.getPosition()))
+				.forEach(region::addEntity);
+
+			if (region.hasNewEntities()) {
+				// This is not how it works, source_eid should be region entity id, but we dont have an entity for regions yet
+				callEvent(EventType.EVENT_ENTER_REGION, new ScriptArgs(region.config_id).setSourceEntityId(region.config_id));
+				
+				region.resetNewEntities();
+			}
+		}
 	}
 	
 	public void spawnGadgetsInGroup(SceneGroup group) {

src/main/java/emu/grasscutter/scripts/ScriptLib.java

@@ -17,6 +17,7 @@ import emu.grasscutter.game.entity.GameEntity;
 import emu.grasscutter.scripts.constants.EventType;
 import emu.grasscutter.scripts.data.SceneGroup;
 import emu.grasscutter.scripts.data.SceneMonster;
+import emu.grasscutter.scripts.data.SceneRegion;
 import emu.grasscutter.scripts.data.ScriptArgs;
 import emu.grasscutter.server.packet.send.PacketGadgetStateNotify;
 import emu.grasscutter.server.packet.send.PacketWorktopOptionNotify;
@@ -184,6 +185,19 @@ public class ScriptLib {
 		return 0;
 	}
 	
+	public int GetRegionEntityCount(LuaTable table) {
+		int regionId = table.get("region_eid").toint();
+		int entityType = table.get("entity_type").toint();
+
+		SceneRegion region = this.getSceneScriptManager().getRegionById(regionId);
+		
+		if (region == null) {
+			return 0;
+		}
+
+		return (int) region.getEntities().intStream().filter(e -> e >> 24 == entityType).count();
+	}
+	
 	public void PrintContextLog(String msg) {
 		Grasscutter.getLogger().info("[LUA] " + msg);
 	}

src/main/java/emu/grasscutter/scripts/data/SceneGroup.java

@@ -14,6 +14,7 @@ public class SceneGroup {
 	public List<SceneMonster> monsters;
 	public List<SceneGadget> gadgets;
 	public List<SceneTrigger> triggers;
+	public List<SceneRegion> regions;
 	public List<SceneSuite> suites;
 	public SceneInitConfig init_config;
 	

src/main/java/emu/grasscutter/scripts/data/SceneRegion.java

@@ -0,0 +1,57 @@
+package emu.grasscutter.scripts.data;
+
+import emu.grasscutter.game.entity.GameEntity;
+import emu.grasscutter.scripts.constants.ScriptRegionShape;
+import emu.grasscutter.utils.Position;
+import it.unimi.dsi.fastutil.ints.IntOpenHashSet;
+import it.unimi.dsi.fastutil.ints.IntSet;
+
+public class SceneRegion {
+	public int config_id;
+	public int shape;
+	public Position pos;
+	public Position size;
+	
+	private boolean hasNewEntities;
+	private final IntSet entities; // Ids of entities inside this region
+	
+	public SceneRegion() {
+		this.entities = new IntOpenHashSet();
+	}
+	
+	public IntSet getEntities() {
+		return entities;
+	}
+
+	public void addEntity(GameEntity entity) {
+		if (this.getEntities().contains(entity.getId())) {
+			return;
+		}
+		this.getEntities().add(entity.getId());
+		this.hasNewEntities = true;
+	}
+	
+	public void removeEntity(GameEntity entity) {
+		this.getEntities().remove(entity.getId());
+	}
+	
+	public boolean contains(Position p) {
+		switch (shape) {
+			case ScriptRegionShape.CUBIC:
+				return (Math.abs(pos.getX() - p.getX()) <= size.getX()) &&
+				       (Math.abs(pos.getZ() - p.getZ()) <= size.getZ());
+			case ScriptRegionShape.SPHERE:
+				return false;
+		}
+		
+		return false;
+	}
+
+	public boolean hasNewEntities() {
+		return hasNewEntities;
+	}
+	
+	public void resetNewEntities() {
+		hasNewEntities = false;
+	}
+}

src/main/java/emu/grasscutter/scripts/data/ScriptArgs.java

@@ -4,6 +4,7 @@ public class ScriptArgs {
 	public int param1;
 	public int param2;
 	public int param3;
+	public int source_eid; // Source entity
 	
 	public ScriptArgs() {
 		
@@ -44,4 +45,13 @@ public class ScriptArgs {
 		this.param3 = param3;
 		return this;
 	}
+
+	public int getSourceEntityId() {
+		return source_eid;
+	}
+
+	public ScriptArgs setSourceEntityId(int source_eid) {
+		this.source_eid = source_eid;
+		return this;
+	}
 }