(GL)JPanel w/o GLEventListener

[Walrabe]

Hello Javagaming-People,

is there a simple solution to connect OpenGL-Renderings to the JPanel Buffer? I dont want to use the GLEventListener/single-thread. I think of single-buffered OGL to double-buffered JPanel (if ogl to jpanel-(front/back)buffer-switch goes fast) or double-buffer OGL to single-buffered JPanel (if there are some advantages). Does anyone have experience with this.

I have read the sources (GLJPanel.java) but there seem to be many graca-vendor spec. "hacks" (sorry). So, before i do longtime-experiments, i ask here for some solutions (should be small & simple).

Eventually, the best aprroach is the combination of JPanel/BufferStrategy/direct OGL to JPanel-Buffer rendering?!

Thanks for your ideas! Cheers, Chris

PS: Sorry for my english...

[mgianota]

There's a reasonably simple approach called active rendering which permits you to dispense with the GLEventListener call-back method. http://fivedots.coe.psu.ac.th/~ad/jg2/ch15/jogl1v4.pdf explains the technique in detail.

--Mario

[Mithrandir]

Yes, it's a little tricky doing your own context management, particularly working with JOGL's lazy loading. We do this in the core of Aviatrix3D with a fair amount of success. Occasionally it falls over, particularly on OS/X, but it works.

Games published by our own members! Check 'em out!

[Walrabe]

Following test-code doesnt work:

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import java.awt.Dimension; import javax.media.opengl.*; import javax.swing.*; import com.sun.opengl.impl.Java2D; public final class Window extends JFrame {    public Window() {       super("Titel");       JPanel panel = new JPanel(null);       panel.setPreferredSize(new Dimension(640, 480));       panel.setSize(640, 480);       add(panel);       Java2D.invokeWithOGLContextCurrent(panel.getGraphics(),          new Runnable() {             @Override             public void run() {                drawable =                   GLDrawableFactory.getFactory().createExternalGLDrawable();                context =                   GLDrawableFactory.getFactory().createExternalGLContext();             }       });       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);       pack(); setResizable(false); setVisible(true);       try {          context.makeCurrent();       } catch (Exception e) {          e.printStackTrace();       }       GL gl = context.getGL();       gl.glMatrixMode(GL.GL_PROJECTION); gl.glLoadIdentity();       gl.glOrtho(-4d / 3d, 4d / 3d, -1d, 1d, 0d, 1d);       gl.glMatrixMode(GL.GL_MODELVIEW); gl.glLoadIdentity();       gl.glViewport(0, 0, 640, 480);       gl.glClear(GL.GL_COLOR_BUFFER_BIT);       gl.glRectf(-.8f, -.8f, .8f, .8f);       gl.glFinish();       drawable.swapBuffers(); // ?      panel.repaint(); // ?       context.release();    }    private GLDrawable drawable;    private GLContext context;    private static final long serialVersionUID = 0l;    /**     * Startet die Anwendung.     * @param args Nicht verwendet     */    public static void main(String[] args) {       java.awt.EventQueue.invokeLater(new Runnable() {          @Override public void run() {new Window();}       });    } }

Any ideas? Cheers, Chris