Keep a global ShapeRenderer instance rather than an instance per entity

core/src/com/me/brickbuster/BrickBuster.java

@@ -78,15 +78,15 @@ public class BrickBuster extends ApplicationAdapter {
 
 		long start_render = System.nanoTime();
 		for (Brick block : bricks) {
-			block.render();
+			block.render(sr);
 		}
 		for (PowerUp powerUp : powerUps) {
-			powerUp.render();
+			powerUp.render(sr);
 		}
 		for (Ball ball : balls) {
-			ball.render();
+			ball.render(sr);
 		}
-		paddle.render();
+		paddle.render(sr);
 
 		if (shieldActive) {
 			sr.begin(ShapeRenderer.ShapeType.Filled);

core/src/com/me/brickbuster/entity/Ball.java

@@ -2,6 +2,7 @@ package com.me.brickbuster.entity;
 
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.math.MathUtils;
 import com.badlogic.gdx.math.Vector2;
@@ -30,11 +31,11 @@ public class Ball extends Entity {
 	}
 
 	@Override
-	public void render() {
+	public void render(ShapeRenderer sr) {
-		getShapeRenderer().begin(ShapeType.Filled);
+		sr.begin(ShapeType.Filled);
-		getShapeRenderer().setColor(BALL_COLOR);
+		sr.setColor(BALL_COLOR);
-		getShapeRenderer().circle(getPos().x, getPos().y, RADIUS);
+		sr.circle(getPos().x, getPos().y, RADIUS);
-		getShapeRenderer().end();
+		sr.end();
 	}
 
 	@Override

core/src/com/me/brickbuster/entity/Brick.java

@@ -1,6 +1,7 @@
 package com.me.brickbuster.entity;
 
 import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.math.Vector2;
 import com.me.brickbuster.BrickBuster;
@@ -28,11 +29,11 @@ public class Brick extends Entity {
 	}
 
 	@Override
-	public void render() {
+	public void render(ShapeRenderer sr) {
-		getShapeRenderer().begin(ShapeType.Filled);
+		sr.begin(ShapeType.Filled);
-		getShapeRenderer().setColor(BLOCK_COLOR);
+		sr.setColor(BLOCK_COLOR);
-		getShapeRenderer().rect(getX(), getY(), BLOCK_WIDTH, BLOCK_HEIGHT);
+		sr.rect(getX(), getY(), BLOCK_WIDTH, BLOCK_HEIGHT);
-		getShapeRenderer().end();
+		sr.end();
 	}
 
 	@Override

core/src/com/me/brickbuster/entity/Entity.java

@@ -6,17 +6,15 @@ import com.me.brickbuster.BrickBuster;
 
 public abstract class Entity {
 
-	private ShapeRenderer shapeRenderer;
 	private BrickBuster brickBuster;
 	private Vector2 pos;
 
 	public Entity(BrickBuster brickBuster, float x, float y) {
-		this.shapeRenderer = new ShapeRenderer();
 		this.brickBuster = brickBuster;
 		this.pos = new Vector2(x, y);
 	}
 
-	public abstract void render();
+	public abstract void render(ShapeRenderer sr);
 
 	public abstract void update(float dt);
 
@@ -24,10 +22,6 @@ public abstract class Entity {
 		return brickBuster;
 	}
 
-	public ShapeRenderer getShapeRenderer() {
-		return shapeRenderer;
-	}
-
 	public Vector2 getPos() {
 		return pos;
 	}

core/src/com/me/brickbuster/entity/Paddle.java

@@ -3,6 +3,7 @@ package com.me.brickbuster.entity;
 import com.badlogic.gdx.Gdx;
 import com.badlogic.gdx.Input;
 import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.math.Vector2;
 import com.me.brickbuster.BrickBuster;
@@ -24,11 +25,11 @@ public class Paddle extends Entity {
 	}
 
 	@Override
-	public void render() {
+	public void render(ShapeRenderer sr) {
-		getShapeRenderer().begin(ShapeType.Filled);
+		sr.begin(ShapeType.Filled);
-		getShapeRenderer().setColor(sticky? Color.GRAY : PADDLE_COLOR);
+		sr.setColor(sticky? Color.GRAY : PADDLE_COLOR);
-		getShapeRenderer().rect(getX() - width/2, getY(), width, PADDLE_HEIGHT);
+		sr.rect(getX() - width/2, getY(), width, PADDLE_HEIGHT);
-		getShapeRenderer().end();
+		sr.end();
 	}
 
 	@Override

core/src/com/me/brickbuster/entity/powerup/PowerUp.java

@@ -2,6 +2,7 @@ package com.me.brickbuster.entity.powerup;
 
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType;
 import com.badlogic.gdx.math.Vector2;
 import com.me.brickbuster.BrickBuster;
 import com.me.brickbuster.Utils;
@@ -23,11 +24,11 @@ public abstract class PowerUp extends Entity {
 	}
 
 	@Override
-	public void render() {
+	public void render(ShapeRenderer sr) {
-		getShapeRenderer().begin(ShapeRenderer.ShapeType.Filled);
+		sr.begin(ShapeType.Filled);
-		getShapeRenderer().setColor(color);
+		sr.setColor(color);
-		getShapeRenderer().circle(getX(), getY(), RADIUS);
+		sr.circle(getX(), getY(), RADIUS);
-		getShapeRenderer().end();
+		sr.end();
 	}
 
 	@Override