close window on game end

app/src/main/java/chess/view/DDDrender/DDDView.java

@@ -431,6 +431,7 @@ public class DDDView extends GameAdapter implements CommandSender {
     @Override
     public void onGameEnd() {
         openPopup("End");
+        this.window.stop();
     }
 
     @Override

app/src/main/java/chess/view/DDDrender/Window.java

@@ -64,6 +64,8 @@ public class Window implements Closeable {
 	private ImInt detailLevel = new ImInt(10);
 	private ImBoolean pixelatedFrame = new ImBoolean(true);
 
+	private boolean shouldBeClosed = false;
+
 	public Window(Renderer renderer, World world, Camera camera) {
 		this.renderer = new Renderer();
 		this.cam = camera;
@@ -280,7 +282,7 @@ public class Window implements Closeable {
 
 		// Run the rendering loop until the user has attempted to close
 		// the window or has pressed the ESCAPE key.
-		while (!glfwWindowShouldClose(window)) {
+		while (!shouldBeClosed && !glfwWindowShouldClose(window)) {
 
 			newFrame();
 
@@ -304,8 +306,13 @@ public class Window implements Closeable {
 		}
 	}
 
+	public void stop() {
+		shouldBeClosed = true;
+	}
+
 	@Override
 	public void close() throws IOException {
+		shouldBeClosed = true;
 		this.renderer.close();
 	}