2 glCanvas in a JFrame

[Bobza]

Hi all,

I built a JFrame containing 2 glCanvases.
I linked each canvas with a different renderer, implementing the GLEventListener interface. Each renderer has its own Animator.

It doesn't work : rendering is weird. It looks like parts of rendering are past to the other glCanvas.

Any ideas ? is this GLContext or multi-threading issue ?

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/* Generated with neatbeans */ public class SelectorDialog extends javax.swing.JDialog { ....     private GLCanvas canvas1;     private GLCanvas canvas2;     public GLCanvas getCanvas1() {         return canvas1;     }     public GLCanvas getCanvas2() {         return canvas2;     } } public View1 implements GLEventListener { ... } public View2 implements GLEventListener { ... } public class MySelector extends Selector { public MySelector() {    GLCanvas canvas1 = getCanvas1();    canvas1.setAutoSwapBufferMode(true);    View1 view1 = new View1();    canvas1.addGLEventListener(view1);               FPSAnimator animator = new FPSAnimator( canvas1 , 60 );         animator.setRunAsFastAsPossible(false);         animator.start();                 GLCanvas canvas2 = getCanvas2();         canvas2.setAutoSwapBufferMode(true);    View2 view2 = new View2();    canvas2.addGLEventListener(view2);               FPSAnimator animator2 = new FPSAnimator( canvas2, 60 );         animator2.setRunAsFastAsPossible(false);         animator2.start();                 setVisible(true); } }

[gouessej]

Which version of JOGL do you use? Have you tried to do the same thing with NEWT?

[lhkbob]

If you're using GLEventListeners it shouldn't be a multi-threading issue, the two canvases would just take turns.  It's likely that the two GLCanvases are being laid out incorrectly (and then overlapping heavy-weight components == bad) or the implementation of GLCanvas assumes that it can take over the entire window when it's rendering (but I don't know).

Can you post the actual code that adds the canvases to your JDialog? I'll give it a shot on my computer.

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[bobjob]

do you need to use 2 canvas's? Why not just use multiple view ports?

[Bobza]

Thanks all for your replies (and sorry for my approximate english writing)

It looks ok now ; my renderers were wrong and not dealing properly shared datas ; no troubles with multi-threading or so ! The code in my first post is ok. I'm sorry for making you waste your time.

I saw a previous thread on the same kind of trouble ; it was said in it to use a single animator for many canvases, and to deactivate autoSwapBuffering.
By the way, my GUI works with autoSwapBuffering enabled and with 2 animators, but that was an interesting way to explore.
However, I dont really understand the behaviour of all this. Where could I find some ressources on the subject ? How buffer swaping works or should work in a multi canvases context ?

do you need to use 2 canvas's? Why not just use multiple view ports?

I worked and thought on such a solution. However technics are much more complicated (i'm quite a beginner using opengl and dont want to go to far in it for now). And in my case, the idea was to create a GUI that mixes 3d rendering and other swing components (buttons, trees ... ) so that i dont have to re-create a 3d JTree-like component. I searched for a kind of jogl GUI "library", but couldn't find one.

Another question I cant find no response is about the "theory and technics" on the popup windows and dialogs in games.
Let's take Minecraft for example ; when you open the main menu, or the "material" menu : how does it work ? I guess he doesnt use a JFrame or JDialog ... Does he render the menu or dialog in a texture and rendering this texture over the main scene ? But with non modal dialogs how should this work ?

Thanks in advance

[gouessej]

Don't disable auto swap buffer mode if you use JOGL 2.0 beta as it hugely increases the memory consumption.