Add basic support for the 1.21.2 minecart experiment

core/src/main/java/org/geysermc/geyser/translator/protocol/java/entity/JavaMoveMinecartTranslator.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2024 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.translator.protocol.java.entity;
+
+import org.cloudburstmc.protocol.bedrock.packet.SetEntityMotionPacket;
+import org.geysermc.geyser.entity.type.Entity;
+import org.geysermc.geyser.session.GeyserSession;
+import org.geysermc.geyser.translator.protocol.PacketTranslator;
+import org.geysermc.geyser.translator.protocol.Translator;
+import org.geysermc.mcprotocollib.protocol.data.game.entity.MinecartStep;
+import org.geysermc.mcprotocollib.protocol.packet.ingame.clientbound.entity.ClientboundMoveMinecartPacket;
+
+@Translator(packet = ClientboundMoveMinecartPacket.class)
+public class JavaMoveMinecartTranslator extends PacketTranslator<ClientboundMoveMinecartPacket> {
+
+    @Override
+    public void translate(GeyserSession session, ClientboundMoveMinecartPacket packet) {
+        if (!packet.getLerpSteps().isEmpty()) {
+            Entity entity = session.getEntityCache().getEntityByJavaId(packet.getEntityId());
+
+            MinecartStep lastStep = packet.getLerpSteps().get(packet.getLerpSteps().size() - 1);
+            entity.moveAbsolute(lastStep.position().toFloat(), lastStep.yRot(), lastStep.xRot(), entity.isOnGround(), false);
+
+            entity.setMotion(lastStep.movement().toFloat());
+            SetEntityMotionPacket entityMotionPacket = new SetEntityMotionPacket();
+            entityMotionPacket.setRuntimeEntityId(entity.getGeyserId());
+            entityMotionPacket.setMotion(entity.getMotion());
+            session.sendUpstreamPacket(entityMotionPacket);
+        }
+    }
+}