From 3c45ca9de83771cfe9233c30e9284512c07227c4 Mon Sep 17 00:00:00 2001
From: Brychan Dempsey <brychand@hotmail.com>
Date: Sat, 12 Jun 2021 15:56:13 +1200
Subject: [PATCH] Fixed exceptions due to the renderer not being ready

---
 demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java  | 6 +++++-
 .../nz/ac/massey/javaecs/examples/Systems/RenderSystem.java | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java b/demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java
index 9cb547d..d712bd9 100644
--- a/demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java
+++ b/demo1/src/main/java/nz/ac/massey/javaecs/examples/App.java
@@ -1,6 +1,7 @@
 package nz.ac.massey.javaecs.examples;
 
 import java.util.Random;
+import java.util.concurrent.Semaphore;
 
 import javafx.scene.paint.Color;
 import nz.ac.massey.javaecs.*;
@@ -14,6 +15,8 @@ public final class App {
     private App() {
     }
 
+    public static Semaphore rendererReadySemaphore = new Semaphore(0);
+
     /**
      * Simple physics simulation.
      * @param args The arguments of the program.
@@ -127,10 +130,11 @@ public final class App {
         /************************************
         **    Run init() on the systems    **
         *************************************/
+        renderSystem.init();
+        rendererReadySemaphore.acquire();
         physicsSystem.init();
         collisionSystem.init();
         logUpdateSystem.init();
-        renderSystem.init();
         existenceSystem.init();
         reportSystem.init();
 
diff --git a/demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java b/demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java
index 5467827..0329934 100644
--- a/demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java
+++ b/demo1/src/main/java/nz/ac/massey/javaecs/examples/Systems/RenderSystem.java
@@ -14,6 +14,7 @@ import javafx.stage.Stage;
 import nz.ac.massey.javaecs.ECSSystem;
 import nz.ac.massey.javaecs.Engine;
 import nz.ac.massey.javaecs.Entity;
+import nz.ac.massey.javaecs.examples.App;
 import nz.ac.massey.javaecs.examples.Components.BoxRender;
 import nz.ac.massey.javaecs.examples.Components.Render;
 import nz.ac.massey.javaecs.examples.Components.TextRender;
@@ -102,6 +103,8 @@ public class RenderSystem extends ECSSystem{
             Scene scene = new Scene(root, 1024, 1024, Color.BLACK);
             primaryStage.setScene(scene);
             primaryStage.show();
+            // Signal the renderer is ready
+            App.rendererReadySemaphore.release();
         }
         
         public static void run(){