Added shield shader, temporarily disabled dependencies and shield energy

core/src/io/anuke/mindustry/entities/effect/Shield.java

@@ -1,11 +1,56 @@
 package io.anuke.mindustry.entities.effect;
 
+import com.badlogic.gdx.graphics.Color;
+
+import io.anuke.mindustry.world.Tile;
+import io.anuke.mindustry.world.blocks.types.ShieldBlock;
+import io.anuke.ucore.core.Draw;
+import io.anuke.ucore.core.Graphics;
 import io.anuke.ucore.entities.Entity;
 
 public class Shield extends Entity{
 	public boolean active;
+	private final Tile tile;
 	//TODO
 	
+	public Shield(Tile tile){
+		this.tile = tile;
+		this.x = tile.worldx();
+		this.y = tile.worldy();
+	}
+	
+	public float drawSize(){
+		return 150;
+	}
+	
+	@Override
+	public void update(){
+		if(!(tile.block() instanceof ShieldBlock)){
+			remove();
+		}
+	}
+	
+	@Override
+	public void draw(){
+		Graphics.surface("shield", false);
+		Draw.color(Color.ROYAL);
+		Draw.thick(2f);
+		Draw.rect("circle2", (int)x + 0.5f, (int)y + 0.5f, 102f, 102f);
+		Draw.reset();
+		Graphics.surface();
+	}
+	/*
+	@Override
+	public void drawOver(){
+		Graphics.surface("shield", false);
+		Draw.thick(1f);
+		Draw.color(Color.SKY);
+		Draw.circle(x, y, ((Timers.time() + 50f) % 100f) / 2f);
+		Draw.circle(x, y, (Timers.time() % 100f) / 2f);
+		Draw.reset();
+		Graphics.surface();
+	}*/
+	
 	@Override
 	public void added(){
 		active = true;