jogl multithreading issue

OpenGL Development JOGL Development
#1

Hello

Here’s my problem. I’m developing a 3d application with gui, which downloads through internet models and textures. Downloading takes 30 seconds and during that time GUI is obviously frozen. So I decided to move the loading procedure to another thread and display progress bar but unfortunately I got stuck :frowning:

Here’s pseudocode snippet:


GLContext glContext;
boolean contextLost = false;

class Loader implements Runnable {
               
        public void run()
        {
            contextLost=true;
            glContext.makeCurrent();
            LoadModel(); // create texture objects, VBOs and so on...
            glContext.release();

        }
    }

public void init(GLAutoDrawable drawable)
{
     initopengl();

     glContext = drawable.getContext();
     glContext.release();
     
     StartLoaderThread();
}

public void display(GLAutoDrawable drawable)
{
    if(stillLoadingModel)
         return;
    if(contextLost==true)
    {
       contextLost=false;
       glContext.makeCurrent();
     }
    RenderScene();
}

It doesn’t work. Application throws an exception.


Exception in thread "AWT-EventQueue-0" javax.media.opengl.GLException: No OpenGL context is current on this thread

I tried also to create second context (which would share all data with the main one) with GLCanvas createContext(GLContext shareWith) method but it throws exception

Exception in thread "Thread-4" javax.media.opengl.GLException: Surface already locked

I’m no expert in multithreading jogl apps so if someone helped me with that issue I would be grateful :slight_smile:

EDIT:
After having changed GLCanvas to GLJPanel createContext(GLContext shareWith) works but another error occurs. I create second context in the main thread and then call on that context makeCurrent from another thread. Although it works on Mac OS X without a glitch, on Windows Vista app throws an exception: (inside 2nd thread) wglShareLists failed :(. Any ideas ?