Minimize teleport packet size and usage

SpigotCore_8/src/de/steamwar/core/BountifulWrapper8.java

@@ -78,6 +78,19 @@ public class BountifulWrapper8 implements BountifulWrapper.IBountifulWrapper {
         };
     }
 
+    @Override
+    public BountifulWrapper.PositionSetter getRelMoveSetter(Class<?> packetClass) {
+        Reflection.FieldAccessor<?> moveX = Reflection.getField(packetClass, "b", byte.class);
+        Reflection.FieldAccessor<?> moveY = Reflection.getField(packetClass, "c", byte.class);
+        Reflection.FieldAccessor<?> moveZ = Reflection.getField(packetClass, "d", byte.class);
+
+        return (packet, x, y, z) -> {
+            moveX.set(packet, (byte)(x*32));
+            moveY.set(packet, (byte)(y*32));
+            moveZ.set(packet, (byte)(z*32));
+        };
+    }
+
     @Override
     public BountifulWrapper.UUIDSetter getUUIDSetter(Class<?> packetClass) {
         return (packet, uuid) -> {};

SpigotCore_9/src/de/steamwar/core/BountifulWrapper9.java

@@ -72,6 +72,20 @@ public class BountifulWrapper9 implements BountifulWrapper.IBountifulWrapper {
         };
     }
 
+    @Override
+    public BountifulWrapper.PositionSetter getRelMoveSetter(Class<?> packetClass) {
+        Class<?> type = Core.getVersion() > 12 ? short.class : int.class;
+        Reflection.FieldAccessor<?> moveX = Reflection.getField(packetClass, "b", type);
+        Reflection.FieldAccessor<?> moveY = Reflection.getField(packetClass, "c", type);
+        Reflection.FieldAccessor<?> moveZ = Reflection.getField(packetClass, "d", type);
+
+        return (packet, x, y, z) -> {
+            moveX.set(packet, (short)(x*4096));
+            moveY.set(packet, (short)(y*4096));
+            moveZ.set(packet, (short)(z*4096));
+        };
+    }
+
     @Override
     public BountifulWrapper.UUIDSetter getUUIDSetter(Class<?> packetClass) {
         Reflection.FieldAccessor<UUID> uuidField = Reflection.getField(packetClass, UUID.class, 0);

SpigotCore_Main/src/de/steamwar/core/BountifulWrapper.java

@@ -39,6 +39,7 @@ public class BountifulWrapper {
         Object getDataWatcherItem(Object dataWatcherObject, Object value);
 
         PositionSetter getPositionSetter(Class<?> packetClass, int fieldOffset);
+        PositionSetter getRelMoveSetter(Class<?> packetClass);
         UUIDSetter getUUIDSetter(Class<?> packetClass);
     }
 

SpigotCore_Main/src/de/steamwar/entity/REntity.java

@@ -104,20 +104,37 @@ public class REntity {
         move(location.getX(), location.getY(), location.getZ(), location.getPitch(), location.getYaw(), rotToByte(location.getYaw()));
     }
 
+    private static final double MAX_REL_MOVE = Core.getVersion() > 8 ? 8.0 : 4.0;
     public void move(double locX, double locY, double locZ, float pitch, float yaw, byte headYaw) {
         server.preEntityMove(this, locX, locZ);
+
         double fromX = this.x;
         double fromZ = this.z;
+        double diffX = x - locX;
+        double diffY = y - locY;
+        double diffZ = z - locZ;
+        boolean rotEq = this.yaw == yaw && this.pitch == pitch;
+
         this.x = locX;
         this.y = locY;
         this.z = locZ;
         this.yaw = rotToByte(yaw);
         this.pitch = rotToByte(pitch);
+
+        if(Math.abs(diffX) < MAX_REL_MOVE && Math.abs(diffY) < MAX_REL_MOVE && Math.abs(diffZ) < MAX_REL_MOVE) {
+            Object packet = getMoveLookPacket(diffX, diffY, diffZ,rotEq);
+
+            if(packet != null)
+                server.updateEntity(this, packet);
+        } else {
             server.updateEntity(this, getTeleportPacket());
+        }
+
         if(this.headYaw != headYaw) {
             this.headYaw = headYaw;
             server.updateEntity(this, getHeadRotationPacket());
         }
+
         server.postEntityMove(this, fromX, fromZ);
     }
 
@@ -364,6 +381,35 @@ public class REntity {
         return packet;
     }
 
+    private static final Class<?> entityPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntity");
+    private static final Reflection.FieldAccessor<Integer> moveEntityId = Reflection.getField(entityPacket, int.class, 0);
+    private static final BountifulWrapper.PositionSetter movePosition = BountifulWrapper.impl.getRelMoveSetter(entityPacket);
+    private static final Reflection.FieldAccessor<Byte> lookYaw = Reflection.getField(entityPacket, "e", byte.class);
+    private static final Reflection.FieldAccessor<Byte> lookPitch = Reflection.getField(entityPacket, "f", byte.class);
+    private static final Class<?> lookPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntity$PacketPlayOutEntityLook");
+    private static final Class<?> movePacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntity$PacketPlayOutRelEntityMove");
+    private static final Class<?> moveLookPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntity$PacketPlayOutRelEntityMoveLook");
+    private Object getMoveLookPacket(double diffX, double diffY, double diffZ, boolean rotEq) {
+        Class<?> clazz;
+        if(diffX == 0 && diffY == 0 && diffZ == 0) {
+            if(rotEq)
+                return null;
+
+            clazz = lookPacket;
+        } else if (rotEq) {
+            clazz = movePacket;
+        } else {
+            clazz = moveLookPacket;
+        }
+
+        Object packet = Reflection.newInstance(clazz);
+        moveEntityId.set(packet, entityId);
+        movePosition.set(packet, diffX, diffY, diffZ);
+        lookYaw.set(packet, yaw);
+        lookPitch.set(packet, pitch);
+        return packet;
+    }
+
     private static final Class<?> headRotationPacket = Reflection.getClass("{nms.network.protocol.game}.PacketPlayOutEntityHeadRotation");
     private static final Reflection.FieldAccessor<Integer> headRotationEntity = Reflection.getField(headRotationPacket, int.class, 0);
     private static final Reflection.FieldAccessor<Byte> headRotationYaw = Reflection.getField(headRotationPacket, byte.class, 0);