Expose entity hitboxes in API, store bedrock position to avoid re-calculation

api/src/main/java/org/geysermc/geyser/api/entity/data/GeyserEntityDataTypes.java

@@ -1,5 +1,7 @@
 package org.geysermc.geyser.api.entity.data;
 
+import org.geysermc.geyser.api.entity.data.types.Hitbox;
+
 /**
  * Contains commonly used {@link GeyserEntityDataType} constants for built-in entity
  * metadata fields.
@@ -48,6 +50,12 @@ public final class GeyserEntityDataTypes {
     public static final GeyserEntityDataType<Float> SCALE =
         GeyserEntityDataType.of(Float.class, "scale");
 
+    /**
+     * Represents custom hitboxes for entities
+     */
+    public static final GeyserListEntityDataType<Hitbox> HITBOXES =
+        GeyserListEntityDataType.of(Hitbox.class, "hitboxes");
+
     private GeyserEntityDataTypes() {
         // no-op
     }

api/src/main/java/org/geysermc/geyser/api/entity/data/GeyserListEntityDataType.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2025 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.api.entity.data;
+
+import org.geysermc.geyser.api.GeyserApi;
+
+import java.util.List;
+
+/**
+ * Represents a list of objects for an entity data types
+ * For example, there can be multiple hitboxes on an entity
+ *
+ * @param <T>
+ */
+public interface GeyserListEntityDataType<T> extends GeyserEntityDataType<List<T>> {
+
+    Class<T> listTypeClass();
+
+    /**
+     * API usage only, use the types defined in {@link GeyserEntityDataTypes}
+     */
+    static <T> GeyserListEntityDataType<T> of(Class<T> typeClass, String name) {
+        return GeyserApi.api().provider(GeyserListEntityDataType.class, List.class, typeClass, name);
+    }
+}

api/src/main/java/org/geysermc/geyser/api/entity/data/types/Hitbox.java

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2025 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.api.entity.data.types;
+
+import org.cloudburstmc.math.vector.Vector3f;
+import org.geysermc.geyser.api.GeyserApi;
+
+/**
+ * Represents an entity hitbox.
+ */
+public interface Hitbox {
+
+    /**
+     * The min "corner" of the hitbox
+     * @return the vector of the corner
+     */
+    Vector3f min();
+
+    /**
+     * The max "corner" of the hitbox
+     * @return the vector of the corner
+     */
+    Vector3f max();
+
+    /**
+     * The pivot of the hitbox
+     * @return
+     */
+    Vector3f pivot();
+
+    static Builder builder() {
+        return GeyserApi.api().provider(Builder.class);
+    }
+
+    /**
+     * The builder for the hitbox
+     */
+    interface Builder {
+
+        Builder min(Vector3f min);
+
+        Builder max(Vector3f max);
+
+        Builder origin(Vector3f pivot);
+
+        Hitbox build();
+    }
+}