Fix potion effect display (#2194)

Author: lt-name

src/main/java/cn/nukkit/entity/Entity.java

@@ -189,6 +189,8 @@ public abstract class Entity extends Location implements Metadatable {
     public static final int DATA_PLAYER_LAST_DEATH_POS = 127;
     public static final int DATA_PLAYER_LAST_DEATH_DIMENSION = 128;
     public static final int DATA_PLAYER_HAS_DIED = 129;
+    public static final int DATA_COLLISION_BOX = 130; //vector3f
+    public static final int DATA_VISIBLE_MOB_EFFECTS = 131; //long
 
     // Flags
     public static final int DATA_FLAG_ONFIRE = 0;
@@ -845,6 +847,8 @@ protected void recalculateEffectColor() {
         int[] color = new int[3];
         int count = 0;
         boolean ambient = true;
+        long effectsData = 0;
+        int packedEffectsCount = 0;
         for (Effect effect : this.effects.values()) {
             if (effect.isVisible()) {
                 int[] c = effect.getColor();
@@ -855,6 +859,10 @@ protected void recalculateEffectColor() {
                 if (!effect.isAmbient()) {
                     ambient = false;
                 }
+                if (packedEffectsCount < 8) {
+                    effectsData = effectsData << 7 | ((effect.getId() & 0x3f) << 1) | (effect.isAmbient() ? 1 : 0);
+                    packedEffectsCount++;
+                }
             }
         }
 
@@ -869,6 +877,7 @@ protected void recalculateEffectColor() {
             this.setDataProperty(new IntEntityData(Entity.DATA_POTION_COLOR, 0));
             this.setDataProperty(new ByteEntityData(Entity.DATA_POTION_AMBIENT, 0));
         }
+        this.setDataProperty(new LongEntityData(Entity.DATA_VISIBLE_MOB_EFFECTS, effectsData));
     }
 
     public static Entity createEntity(String name, Position pos, Object... args) {