Java-Gaming.org Hi !
Featured games (83)
games approved by the League of Dukes
Games in Showcase (542)
Games in Android Showcase (133)
games submitted by our members
Games in WIP (604)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  GLContext.makeCurrent() problems!  (Read 1373 times)
0 Members and 1 Guest are viewing this topic.
Offline Aikavanak

Junior Newbie





« Posted 2006-05-12 03:32:34 »

Hello,
I've been working on a JOGL application using active rendering. I've based a lot of it off of Andrew Davison's chapter on JOGL (http://www.java-gaming.org/forums/index.php?topic=12512.0). He extends an AWT Canvas to create the class that has the thread that does all the GL rendering, but wraps it in a JPanel. I tried to create one class, extending JPanel, to handle the GL rendering thread. I created a Canvas as an instance variable in that classand added it to the panel. Then I add my custom, threaded panel to a JFrame. But whenever I try to make the context current to make GL calls, a GLExeption is thrown:

1  
2  
3  
4  
5  
6  
7  
Exception in thread "Thread-2" javax.media.opengl.GLException: Unable to lock surface
        at com.sun.opengl.impl.windows.WindowsOnscreenGLDrawable.lockSurface(WindowsOnscreenGLDrawable.java:169)
        at com.sun.opengl.impl.windows.WindowsOnscreenGLContext.makeCurrentImpl(WindowsOnscreenGLContext.java:57)
        at com.sun.opengl.impl.GLContextImpl.makeCurrent(GLContextImpl.java:118)
        at quantum.graphics.RenderJPanel.makeContextCurrent(RenderJPanel.java:108)
        at quantum.graphics.RenderJPanel.run(RenderJPanel.java:123)
        at java.lang.Thread.run(Thread.java:595)


(I called my JPanel RenderJPanel).
Some of my code:

1  
2  
3  
4  
5  
6  
7  
8  
9  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
  private void makeContextCurrent()
  {
    try
    {
      while(context.makeCurrent()==GLContext.CONTEXT_NOT_CURRENT)  // <---- GLException happens here
        Thread.sleep(50);
    }
    catch(InterruptedException e){e.printStackTrace();}
  }

  public void run()
  {
    try
    {
      while((!ready)||(!isVisible()))
        Thread.sleep(50);
    }
    catch(InterruptedException e){e.printStackTrace();}

    makeContextCurrent();  //  <---- GLException happens in this call

    gl=context.getGL();
    glu=new GLU();

    //rendering=new Rendering(this,gl,glu);

    if(renderer!=null)
    {
      init(); // do gl initialization stuff
      context.release();

      while(running)
      {
        makeContextCurrent();

        render(); // draw stuff
        drawable.swapBuffers();

        context.release();
      }

      shutdown(); // clean up gl stuff
    }

    context.destroy();
    System.exit(0);
  }


I'm not creating any other threads in the program, o I don't see how the context could already be current on a different thread. The javadoc says the exception can also be thrown due to "non-recoverable, window system-specific errors." That doesn't help me much though.

Is there a problem with combining the JPanel and the Canvas in the same class? Anything else I'm doing wrong? If more code would be helpful, I can post it too.
Thanks for the help in advance.
Offline Ken Russell

JGO Coder




Java games rock!


« Reply #1 - Posted 2006-05-12 04:49:47 »

Is there a concrete reason why you aren't using the GLEventListener mechanism? If you have confusion about how to use the GLContext class I would strongly recommend you use the framework already in place.

If you absolutely need to manipulate GLContexts manually, please post complete code so we can diagnose what is going wrong.
Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 

Add your game by posting it in the WIP section,
or publish it in Showcase.

The first screenshot will be displayed as a thumbnail.

CopyableCougar4 (13 views)
2014-12-28 02:10:29

BurntPizza (15 views)
2014-12-27 22:38:51

Mr.CodeIt (13 views)
2014-12-27 04:03:04

TheDudeFromCI (17 views)
2014-12-27 02:14:49

Mr.CodeIt (25 views)
2014-12-23 03:34:11

rwatson462 (56 views)
2014-12-15 09:26:44

Mr.CodeIt (46 views)
2014-12-14 19:50:38

BurntPizza (92 views)
2014-12-09 22:41:13

BurntPizza (113 views)
2014-12-08 04:46:31

JscottyBieshaar (86 views)
2014-12-05 12:39:02
How do I start Java Game Development?
by gouessej
2014-12-27 19:41:21

Resources for WIP games
by kpars
2014-12-18 10:26:14

Understanding relations between setOrigin, setScale and setPosition in libGdx
by mbabuskov
2014-10-09 22:35:00

Definite guide to supporting multiple device resolutions on Android (2014)
by mbabuskov
2014-10-02 22:36:02

List of Learning Resources
by Longor1996
2014-08-16 10:40:00

List of Learning Resources
by SilverTiger
2014-08-05 19:33:27

Resources for WIP games
by CogWheelz
2014-08-01 16:20:17

Resources for WIP games
by CogWheelz
2014-08-01 16:19:50
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!