Re: [JAVA3D] Waiting for offscreen buffer rendering stalls my app

[Kelvin Chung]

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>Date: Fri, 24 Aug 2001 13:18:45 +0200
>From: Karsten Fries <[EMAIL PROTECTED]>
>Subject: Re: [JAVA3D] Waiting for offscreen buffer rendering stalls my app
>To: [EMAIL PROTECTED]
>
>Hi Joachim,
>
>thanks for your reply.
>I tested it, but it has no effect.
>
>The really unfortunate thing is that in all examples there exists a
>OnScreenCanvas from which they use the view. I use the default
>view of the canvas (which happens to be exactly what i want for onscreen
>rendering).
>Perhaps there is the problem.
>

Try this example which don't require onScreenCanvas.

>I don't know. Basically I followed all the instructions in the Canvas3D docu.
>Perhaps i hope that furhter discussion solve my problem!
>
>Cheers,
>Karsten
>
>Karsten Fries wrote:
>

- Kelvin
-------------
Java 3D Team
Sun Microsystems Inc.

/*
 *
 *    "@(#)SimpleOffScreenTest.java 1.1 99/11/17"
 *
 * Copyright (c) 1996-1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) Licensee does not utilize the software in a manner
 * which is disparaging to Sun.
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 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
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 * redistribute the Software for such purposes.
 */

import java.awt.*;
import java.applet.*;
import java.awt.image.BufferedImage;
import javax.media.j3d.*;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
import com.sun.j3d.utils.applet.MainFrame;

public class SimpleOffScreenTest extends Applet {

    static final int WIDTH = 200;
    static final int HEIGHT = 200;

    ImageComponent2D buffer;

    public SimpleOffScreenTest() {
        createOffScreenImage();
    }

    public void paint(Graphics g) {
        g.drawImage(buffer.getImage(), 0, 0, this);
    }

    void createOffScreenImage() {
        Canvas3D c = getOffScreenCanvas();

        SimpleUniverse u = new SimpleUniverse(c);
        u.getViewingPlatform().setNominalViewingTransform();
        BranchGroup bg = createSceneGraph();
        u.addBranchGraph(bg);

        createBufferImage();
        c.setOffScreenBuffer(buffer);
        c.renderOffScreenBuffer();
        c.waitForOffScreenRendering();
    }

    Canvas3D getOffScreenCanvas() {
        GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
        Canvas3D c = new Canvas3D(config, true);
        Screen3D scr = c.getScreen3D();
        scr.setSize(new Dimension(1280, 1024));
        scr.setPhysicalScreenWidth(0.36124);
        scr.setPhysicalScreenHeight(0.28899555);
        return c;
    }

    void createBufferImage() {
        BufferedImage offScreenImg = new BufferedImage(WIDTH, WIDTH ,
                                               BufferedImage.TYPE_INT_ARGB);
        buffer = new ImageComponent2D(ImageComponent.FORMAT_RGBA, offScreenImg);
        buffer.setCapability(ImageComponent2D.ALLOW_IMAGE_READ);
    }

    BranchGroup createSceneGraph() {
        BranchGroup objRoot = new BranchGroup();
        objRoot.addChild(new ColorCube(0.4));
        return objRoot;
    }

    public static void main(String argv[]) {
        new MainFrame(new SimpleOffScreenTest(), WIDTH, HEIGHT);
    }
}