Output disappears after 1 second

OpenGL Development JOGL Development
#1

Hello Javagaming-People,

i have some problem with Jogl on my new Ubuntu 8.04 machine. If i start the App (Jogl, JFrame, GLEventListener) the output ist for a half second the correct picture and then it disappears and only a grey window is visible. If i toggle between maximize and normal window, the output is for a very short time shown and disappears again. Under Windows the same sourcecode acts as expected.

Thanks for your help!

Cheers, Chris


import javax.media.opengl.*;
import javax.swing.JFrame;

public final class Main extends JFrame implements GLEventListener {

	public Main() {
		GLCanvas canvas = new GLCanvas();
		canvas.setSize(640, 480);
		canvas.addGLEventListener(this);
		add(canvas);

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		pack();
		setVisible(true);
	}

	@Override
	public void init(GLAutoDrawable drawable) {
		GL gl = drawable.getGL();

		gl.glMatrixMode(GL.GL_PROJECTION);
		gl.glLoadIdentity();
		gl.glOrtho(-4d / 3d, 4d / 3d, -1d, 1d, 0d, 2d);

		gl.glMatrixMode(GL.GL_MODELVIEW);
		gl.glLoadIdentity();
	}

	@Override
	public void display(GLAutoDrawable drawable) {
		GL gl = drawable.getGL();

		gl.glClear(GL.GL_COLOR_BUFFER_BIT);

		gl.glRectf(-.8f, -.8f, .8f, .8f);
	}

	@Override
	public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
		boolean deviceChanged) {}

	@Override
	public void reshape(GLAutoDrawable drawable, int x, int y, int width,
		int height) {}

	private static final long serialVersionUID = 0l;

	/**
	 * Startet die Anwendung.
	 * @param args Nicht verwendet
	 */
	public static void main(String[] args) {
		new Main();
	}

}
#2

I have disabled the visual effects of the OS (Ubuntu 8.04). Thereafter it works.

Cheers, Chris

#3

Besides that, you’re NOT creating/initing your Components on the EDT.

Strange things can and will happen.

It probably did not affect your very trivial app though.