Entity metadata

src/main/java/net/raphimc/viabedrock/api/model/entity/Entity.java

@@ -32,6 +32,7 @@
 import net.raphimc.viabedrock.protocol.data.enums.bedrock.ActorFlags;
 import net.raphimc.viabedrock.protocol.data.enums.bedrock.generated.DataItemType;
 import net.raphimc.viabedrock.protocol.data.enums.java.generated.BossEventOperationType;
+import net.raphimc.viabedrock.protocol.model.EntityProperties;
 import net.raphimc.viabedrock.protocol.model.Position3f;
 import net.raphimc.viabedrock.protocol.rewriter.EntityMetadataRewriter;
 import net.raphimc.viabedrock.protocol.types.BedrockTypes;
@@ -123,6 +124,10 @@ public final void updateEntityData(final EntityData[] entityData, final List<Ent
         this.onEntityDataChanged();
     }
 
+    public final void translateEntityProperties(final EntityProperties properties, final List<EntityData> javaEntityData) {
+        EntityMetadataRewriter.rewriteProperties(this.user, this, properties, javaEntityData);
+    }
+
     public void playSound(final String soundEvent) {
         final PacketWrapper levelSoundEvent = PacketWrapper.create(ClientboundBedrockPackets.LEVEL_SOUND_EVENT, this.user);
         levelSoundEvent.write(BedrockTypes.STRING, soundEvent); // event

src/main/java/net/raphimc/viabedrock/api/model/entity/LivingEntity.java

@@ -158,11 +158,12 @@ public Map<String, EntityEffect> effects() {
 
     protected boolean translateAttribute(final EntityAttribute attribute, final PacketWrapper javaAttributes, final AtomicInteger attributeCount, final List<EntityData> javaEntityData) {
         return switch (attribute.name()) {
-            case "minecraft:attack_damage", "minecraft:knockback_resistance", "minecraft:movement" -> {
+            case "minecraft:attack_damage", "minecraft:knockback_resistance", "minecraft:movement", "minecraft:scale" -> {
                 javaAttributes.write(Types.VAR_INT, BedrockProtocol.MAPPINGS.getJavaEntityAttributes().get(switch (attribute.name()) {
                     case "minecraft:attack_damage" -> Attributes.ATTACK_DAMAGE;
                     case "minecraft:knockback_resistance" -> Attributes.KNOCKBACK_RESISTANCE;
                     case "minecraft:movement" -> Attributes.MOVEMENT_SPEED;
+                    case "minecraft:scale" -> Attributes.SCALE;
                     default -> throw new IllegalStateException("Unhandled entity attribute: " + attribute.name());
                 })); // attribute id
                 javaAttributes.write(Types.DOUBLE, (double) attribute.computeClampedValue()); // base value

src/main/java/net/raphimc/viabedrock/api/model/entity/properties/EntityProperty.java

@@ -0,0 +1,30 @@
+/*
+ * This file is part of ViaBedrock - https://github.com/RaphiMC/ViaBedrock
+ * Copyright (C) 2023-2026 RK_01/RaphiMC and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package net.raphimc.viabedrock.api.model.entity.properties;
+
+public interface EntityProperty {
+
+    record BooleanProperty(String identifier) implements EntityProperty { }
+
+    record IntProperty(String identifier, int minValue, int maxValue) implements EntityProperty { }
+
+    record FloatProperty(String identifier, float minValue, float maxValue) implements EntityProperty { }
+
+    record EnumProperty(String identifier, String[] possibleValues) implements EntityProperty { }
+
+}

src/main/java/net/raphimc/viabedrock/api/model/entity/properties/EntityPropertyList.java

@@ -0,0 +1,23 @@
+/*
+ * This file is part of ViaBedrock - https://github.com/RaphiMC/ViaBedrock
+ * Copyright (C) 2023-2026 RK_01/RaphiMC and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package net.raphimc.viabedrock.api.model.entity.properties;
+
+import java.util.List;
+
+public record EntityPropertyList(List<EntityProperty> intProperties, List<EntityProperty.FloatProperty> floatProperties) {
+}

src/main/java/net/raphimc/viabedrock/protocol/BedrockProtocol.java

@@ -152,6 +152,7 @@ public void init(final UserConnection user) {
 
         user.put(new InventoryTransactionRewriter(user));
         user.put(new MapTracker(user));
+        user.put(new EntityPropertyTracker(user));
     }
 
     @Override

src/main/java/net/raphimc/viabedrock/protocol/packet/EntityPackets.java

@@ -19,6 +19,9 @@
 
 import com.google.common.collect.Lists;
 import com.viaversion.nbt.tag.CompoundTag;
+import com.viaversion.nbt.tag.ListTag;
+import com.viaversion.nbt.tag.StringTag;
+import com.viaversion.nbt.tag.Tag;
 import com.viaversion.viaversion.api.minecraft.Holder;
 import com.viaversion.viaversion.api.minecraft.PaintingVariant;
 import com.viaversion.viaversion.api.minecraft.Vector3d;
@@ -36,6 +39,8 @@
 import net.raphimc.viabedrock.api.model.entity.CustomEntity;
 import net.raphimc.viabedrock.api.model.entity.Entity;
 import net.raphimc.viabedrock.api.model.entity.LivingEntity;
+import net.raphimc.viabedrock.api.model.entity.properties.EntityProperty;
+import net.raphimc.viabedrock.api.model.entity.properties.EntityPropertyList;
 import net.raphimc.viabedrock.api.resourcepack.definition.EntityDefinitions;
 import net.raphimc.viabedrock.api.util.MathUtil;
 import net.raphimc.viabedrock.api.util.PacketFactory;
@@ -50,11 +55,9 @@
 import net.raphimc.viabedrock.protocol.data.enums.java.generated.EquipmentSlot;
 import net.raphimc.viabedrock.protocol.data.generated.java.EntityDataFields;
 import net.raphimc.viabedrock.protocol.data.generated.java.RegistryKeys;
-import net.raphimc.viabedrock.protocol.model.BedrockItem;
-import net.raphimc.viabedrock.protocol.model.EntityAttribute;
-import net.raphimc.viabedrock.protocol.model.EntityEffect;
-import net.raphimc.viabedrock.protocol.model.Position3f;
+import net.raphimc.viabedrock.protocol.model.*;
 import net.raphimc.viabedrock.protocol.rewriter.ItemRewriter;
+import net.raphimc.viabedrock.protocol.storage.EntityPropertyTracker;
 import net.raphimc.viabedrock.protocol.storage.EntityTracker;
 import net.raphimc.viabedrock.protocol.storage.GameSessionStorage;
 import net.raphimc.viabedrock.protocol.storage.ResourcePackStorage;
@@ -504,7 +507,7 @@ public static void register(final BedrockProtocol protocol) {
 
             final long entityRuntimeId = wrapper.read(BedrockTypes.UNSIGNED_VAR_LONG); // entity runtime id
             final EntityData[] entityData = wrapper.read(BedrockTypes.ENTITY_DATA_ARRAY); // entity data
-            wrapper.read(BedrockTypes.ENTITY_PROPERTIES); // entity properties
+            final EntityProperties entityProperties = wrapper.read(BedrockTypes.ENTITY_PROPERTIES); // entity properties
             wrapper.read(BedrockTypes.UNSIGNED_VAR_LONG); // tick
 
             final Entity entity = entityTracker.getEntityByRid(entityRuntimeId);
@@ -515,9 +518,57 @@ public static void register(final BedrockProtocol protocol) {
 
             final List<EntityData> javaEntityData = new ArrayList<>();
             entity.updateEntityData(entityData, javaEntityData);
+            entity.translateEntityProperties(entityProperties, javaEntityData);
             wrapper.write(Types.VAR_INT, entity.javaId()); // entity id
             wrapper.write(VersionedTypes.V26_3.entityDataList, javaEntityData); // entity data
         });
+        protocol.registerClientbound(ClientboundBedrockPackets.SYNC_ENTITY_PROPERTY, null, wrapper -> {
+            wrapper.cancel();
+            final Tag tag = wrapper.read(BedrockTypes.NETWORK_TAG);
+
+            final EntityPropertyTracker epTracker = wrapper.user().get(EntityPropertyTracker.class);
+
+            final String entityType = ((CompoundTag) tag).getString("type");
+            final List<EntityProperty> intEntityProperties = new ArrayList<>();
+            final List<EntityProperty.FloatProperty> floatEntityProperties = new ArrayList<>();
+
+            final ListTag<CompoundTag> properties = ((CompoundTag) tag).getListTag("properties", CompoundTag.class);
+            for (CompoundTag property : properties) {
+                final EntityProperty newProperty = switch (property.getInt("type")) {
+                    case 0 -> new EntityProperty.IntProperty(
+                        property.getString("name"),
+                        property.getInt("min"),
+                        property.getInt("max")
+                    );
+                    case 1 -> new EntityProperty.FloatProperty(
+                        property.getString("name"),
+                        property.getFloat("min"),
+                        property.getFloat("max")
+                    );
+                    case 2 -> new EntityProperty.BooleanProperty(
+                        property.getString("name")
+                    );
+                    case 3 -> new EntityProperty.EnumProperty(
+                        property.getString("name"),
+                        property.getListTag("enum", StringTag.class).stream().map(StringTag::getValue).toArray(String[]::new)
+                    );
+                    default -> {
+                        ViaBedrock.getPlatform().getLogger().log(Level.WARNING, "Received entity property with unknown type: " + property.getInt("type"));
+                        yield null;
+                    }
+                };
+
+                if (newProperty != null) {
+                    if (newProperty instanceof EntityProperty.FloatProperty floatProperty) {
+                        floatEntityProperties.add(floatProperty);
+                    } else {
+                        intEntityProperties.add(newProperty);
+                    }
+                }
+            }
+
+            epTracker.addEntity(entityType, new EntityPropertyList(intEntityProperties, floatEntityProperties));
+        });
         protocol.registerClientbound(ClientboundBedrockPackets.MOB_EFFECT, ClientboundPackets26_3.UPDATE_MOB_EFFECT, wrapper -> {
             final long entityRuntimeId = wrapper.read(BedrockTypes.UNSIGNED_VAR_LONG); // entity runtime id
             final MobEffectPacketPayload_Event event = MobEffectPacketPayload_Event.getByValue(wrapper.read(Types.BYTE), MobEffectPacketPayload_Event.Invalid); // event id