Fixed potential spawner issues

core/src/io/anuke/mindustry/core/Renderer.java

@@ -145,7 +145,7 @@ public class Renderer extends RendererModule{
 
             if(players[0].isDead()){
                 TileEntity core = players[0].getClosestCore();
-                if(core != null && players[0].spawner == -1){
+                if(core != null && players[0].spawner == Unit.noSpawner){
                     smoothCamera(core.x, core.y, 0.08f);
                 }else{
                     smoothCamera(position.x + 0.0001f, position.y + 0.0001f, 0.08f);

core/src/io/anuke/mindustry/entities/Player.java

@@ -60,7 +60,7 @@ public class Player extends Unit implements BuilderTrait, CarryTrait, ShooterTra
     public boolean achievedFlight;
     public Color color = new Color();
     public Mech mech;
-    public int spawner = -1;
+    public int spawner = noSpawner;
 
     public NetConnection con;
     public int playerIndex = 0;
@@ -497,7 +497,7 @@ public class Player extends Unit implements BuilderTrait, CarryTrait, ShooterTra
             updateRespawning();
             return;
         }else{
-            spawner = -1;
+            spawner = noSpawner;
         }
 
         avoidOthers(1f);
@@ -787,7 +787,7 @@ public class Player extends Unit implements BuilderTrait, CarryTrait, ShooterTra
 
     public void updateRespawning(){
 
-        if(spawner != -1 && world.tile(spawner) != null && world.tile(spawner).entity instanceof SpawnerTrait){
+        if(spawner != noSpawner && world.tile(spawner) != null && world.tile(spawner).entity instanceof SpawnerTrait){
             ((SpawnerTrait) world.tile(spawner).entity).updateSpawning(this);
         }else{
             CoreEntity entity = (CoreEntity) getClosestCore();
@@ -803,7 +803,7 @@ public class Player extends Unit implements BuilderTrait, CarryTrait, ShooterTra
     }
 
     public void endRespawning(){
-        spawner = -1;
+        spawner = noSpawner;
     }
 
     //endregion

core/src/io/anuke/mindustry/entities/Unit.java

@@ -12,6 +12,7 @@ import io.anuke.mindustry.net.Interpolator;
 import io.anuke.mindustry.net.Net;
 import io.anuke.mindustry.type.StatusEffect;
 import io.anuke.mindustry.type.Weapon;
+import io.anuke.mindustry.world.Pos;
 import io.anuke.mindustry.world.Tile;
 import io.anuke.mindustry.world.blocks.Floor;
 import io.anuke.ucore.core.Effects;
@@ -39,6 +40,7 @@ public abstract class Unit extends DestructibleEntity implements SaveTrait, Targ
     public static final float velocityPercision = 8f;
     /**Maximum absolute value of a velocity vector component.*/
     public static final float maxAbsVelocity = 127f / velocityPercision;
+    public static final int noSpawner = Pos.get(-1, 1);
 
     private static final Rectangle queryRect = new Rectangle();
     private static final Vector2 moveVector = new Vector2();

core/src/io/anuke/mindustry/entities/units/BaseUnit.java

@@ -55,7 +55,7 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
 
     protected boolean isWave;
     protected Squad squad;
-    protected int spawner = -1;
+    protected int spawner = noSpawner;
 
     /**internal constructor used for deserialization, DO NOT USE*/
     public BaseUnit(){
@@ -114,18 +114,10 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
         return type;
     }
 
-    public Tile getSpawner(){
-        return world.tile(spawner);
-    }
-
     public void setSpawner(Tile tile){
         this.spawner = tile.pos();
     }
 
-    public void setIntSpawner(int pos){
-        this.spawner = pos;
-    }
-
     /**Sets this to a 'wave' unit, which means it has slightly different AI and will not run out of ammo.*/
     public void setWave(){
         isWave = true;
@@ -146,7 +138,7 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
     }
 
     public void updateRespawning(){
-        if(spawner == -1) return;
+        if(spawner == noSpawner) return;
 
         Tile tile = world.tile(spawner);
         if(tile != null && tile.entity != null){
@@ -154,7 +146,7 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
                 ((SpawnerTrait) tile.entity).updateSpawning(this);
             }
         }else{
-            spawner = -1;
+            spawner = noSpawner;
         }
     }
 
@@ -308,7 +300,7 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
 
         avoidOthers(1.25f);
 
-        if(spawner != -1 && (world.tile(spawner) == null || world.tile(spawner).entity == null)){
+        if(spawner != noSpawner && (world.tile(spawner) == null || world.tile(spawner).entity == null)){
             damage(health);
         }
 
@@ -341,7 +333,7 @@ public abstract class BaseUnit extends Unit implements ShooterTrait{
 
     @Override
     public void removed(){
-        spawner = -1;
+        spawner = noSpawner;
     }
 
     @Override