Enabled AI stepping with basic velocity adder system

Enabled AI stepping with basic velocity adder system
Created ServerAudio implementation of Audio which ignores Riiablo.audio calls

core/src/com/riiablo/ai/Npc.java

@@ -172,7 +172,7 @@ public class Npc extends AI {
       } else if (actionTimer > 0) {
         actionTimer -= delta;
         actionPerformed = actionTimer < 0;
-        if (!actionPerformed) {
+        if (!actionPerformed && Riiablo.game != null) { // FIXME: checking Riiablo.game != null for server instances
           int player = Riiablo.game.player;
           Vector2 targetPos = mPosition.get(player).position;
           Vector2 entityPos = mPosition.get(entityId).position;

core/src/com/riiablo/audio/ServerAudio.java

@@ -0,0 +1,25 @@
+package com.riiablo.audio;
+
+import com.badlogic.gdx.assets.AssetManager;
+import com.riiablo.codec.excel.Sounds;
+
+public class ServerAudio extends Audio {
+  public ServerAudio(AssetManager assets) {
+    super(assets);
+  }
+
+  @Override
+  public Instance play(int id, boolean global) {
+    return null;
+  }
+
+  @Override
+  public Instance play(String id, boolean global) {
+    return null;
+  }
+
+  @Override
+  public synchronized Instance play(Sounds.Entry sound, boolean global) {
+    return null;
+  }
+}

server/d2gs/src/com/riiablo/server/d2gs/D2GS.java

@@ -25,11 +25,13 @@ import com.riiablo.COFs;
 import com.riiablo.CharData;
 import com.riiablo.Files;
 import com.riiablo.Riiablo;
+import com.riiablo.audio.ServerAudio;
 import com.riiablo.codec.Animation;
 import com.riiablo.codec.D2;
 import com.riiablo.codec.StringTBLs;
 import com.riiablo.engine.Engine;
 import com.riiablo.engine.EntityFactory;
+import com.riiablo.engine.server.AIStepper;
 import com.riiablo.engine.server.AnimDataResolver;
 import com.riiablo.engine.server.CofManager;
 import com.riiablo.engine.server.ItemInteractor;
@@ -39,6 +41,7 @@ import com.riiablo.engine.server.Pathfinder;
 import com.riiablo.engine.server.SerializationManager;
 import com.riiablo.engine.server.ServerEntityFactory;
 import com.riiablo.engine.server.ServerNetworkIdManager;
+import com.riiablo.engine.server.VelocityAdder;
 import com.riiablo.engine.server.WarpInteractor;
 import com.riiablo.engine.server.component.Networked;
 import com.riiablo.engine.server.component.Player;
@@ -199,6 +202,7 @@ public class D2GS extends ApplicationAdapter {
     Riiablo.cofs = new COFs(Riiablo.assets); // TODO: not needed in prod
     Riiablo.string = new StringTBLs(Riiablo.mpqs); // TODO: not needed in prod
     Riiablo.anim = D2.loadFromFile(Riiablo.mpqs.resolve("data\\global\\eanimdata.d2"));
+    Riiablo.audio = new ServerAudio(Riiablo.assets);
 
     // set DT1 to headless mode
     DT1.loadData = false;
@@ -235,9 +239,11 @@ public class D2GS extends ApplicationAdapter {
         .with(new ObjectInitializer())
         .with(new ObjectInteractor(), new WarpInteractor(), new ItemInteractor())
 
-//        .with(new AIStepper())
+        .with(new AIStepper())
         .with(new Pathfinder())
 
+        .with(new VelocityAdder()) // FIXME: temp until proper physics implemented
+
         .with(factory)
         .with(sync)
         .with(new AnimDataResolver())