Swing canvas and LWJGL 3

Troubleshooting gui
1

Hello,

I’m working with JMonkey for years and i’ve tried tu update it to version 3.1beta2 with lwjgl3. It seems that within this configuration, i cannot create JMECanvas for an integration with Swing.

This code was functional with JMonkey 3.0 on LWJGL2:

package sample;

import java.awt.BorderLayout;
import java.awt.Dimension;

import javax.swing.JFrame;
import javax.swing.JPanel;

import com.jme3.app.SimpleApplication;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.system.AppSettings;
import com.jme3.system.JmeCanvasContext;

public class SwingPanel extends JPanel {

  private static final long serialVersionUID = 1L;
  
  SimpleApplication application = null;
  
  public SwingPanel(){
    
      super();
    
      setLayout(new BorderLayout());
      
      AppSettings applicationSettings = new AppSettings(true);
      applicationSettings.setWidth(1024);
      applicationSettings.setHeight(768);

      application = new SimpleApplication(){

        @Override
        public void simpleInitApp() {
          Box b = new Box(1, 1, 1);
          Geometry geom = new Geometry("Box", b);
          Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
          mat.setColor("Color", ColorRGBA.Blue); 
          geom.setMaterial(mat);            
          rootNode.attachChild(geom);
        }
        
      };
      application.setSettings(applicationSettings); 
      application.setPauseOnLostFocus(false);

      application.createCanvas();
      JmeCanvasContext ctx = (JmeCanvasContext) application.getContext();
      
      add(ctx.getCanvas(), BorderLayout.CENTER);
  }
  
  
  public static void main(String[] args){
    SwingPanel pn = new SwingPanel();
    
    JFrame frame = new JFrame("SwingPanel");
    frame.setSize(new Dimension(640, 480));
    frame.setPreferredSize(new Dimension(640, 480));
    frame.getContentPane().setLayout(new BorderLayout());
    frame.getContentPane().add(pn, BorderLayout.CENTER);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
    
  }
}

But now when o use it within JMonkey 3.1beta2 and jme3-lwjgl3 library i get the exception:

janv. 18, 2017 1:32:51 PM com.jme3.system.JmeDesktopSystem initialize
INFOS: Running on jMonkeyEngine 3.1-beta2
 * Branch: HEAD
 * Git Hash: a71fb28
 * Build Date: 2016-11-22
janv. 18, 2017 1:32:51 PM com.jme3.system.JmeDesktopSystem newContextLwjgl
GRAVE: CRITICAL ERROR: Context class is missing!
Make sure jme3_lwjgl-ogl is on the classpath.
java.lang.ClassNotFoundException: com.jme3.system.lwjgl.LwjglCanvas
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at com.jme3.system.JmeDesktopSystem.newContextLwjgl(JmeDesktopSystem.java:196)
	at com.jme3.system.JmeDesktopSystem.newContext(JmeDesktopSystem.java:279)
	at com.jme3.system.JmeSystem.newContext(JmeSystem.java:162)
	at com.jme3.app.LegacyApplication.createCanvas(LegacyApplication.java:511)
	at sample.SwingPanel.<init>(SwingPanel.java:50)
	at sample.SwingPanel.main(SwingPanel.java:58)

Exception in thread "main" java.lang.NullPointerException
	at com.jme3.system.JmeDesktopSystem.newContext(JmeDesktopSystem.java:280)
	at com.jme3.system.JmeSystem.newContext(JmeSystem.java:162)
	at com.jme3.app.LegacyApplication.createCanvas(LegacyApplication.java:511)
	at sample.SwingPanel.<init>(SwingPanel.java:50)
	at sample.SwingPanel.main(SwingPanel.java:58)

The class com.jme3.system.lwjgl.LwjglCanvas is not found and i’ve seen that it is no more present within the jme3-lwjgl3 jar.

My question is so: Is it possible to integrate rendering canvas within a Swing application using JMonkey 3.1beta2 and jme3-lwjgl3 ?

2

LWJGL3 based on GLFW, it doesn’t work with AWT/Swing. But you have another problem :slight_smile:

3

What is the another problem ?

4

LWJGL3 doesn’t have an implementation of the CanvasContext. I have my own implementation for JavaFXCanvas.

5

Ok, I had not gone so far… And is there a solution to integrate Jmonkey rendering within an AWT/Swing application while keeping LWJGL 3 as renderer ? Even if i have to write a CanvasContext too…

I’m maintaining an heavy application that use JMonkey rendering and i would try to keep the maximum of existing code…

6

It is my implementation for JavaFX, I think you can try to do the same for AWT…

How I remember, if you create a LWJGL3 context before creating a JFrame, it will work.

1 Like
7

Ok thanks a lot !! I’m going to write a Swing context and i will tell you if it works. But i have another question: Do you think that JavaFX should be preferred to Swing in order to create GUI ?

8

Swing is deprecated GUI framework. JavaFX is more modern. I use JavaFX to develop my own editor:

9

Hey Seinturier, did you get to write the Swing context?

10

Hello to all,

I’ve just committed an AppState dedicated to the rendering of JMonkey within an AWT component, I’ve posted a dedicated subject here ( AWT / Swing rendering with LWGJL 3.1.X ).

I can suggest to continue this discussion on the new thread.