help a noob draw a cube! (using GLUT) :)

OpenGL Development JOGL Development
#1

Here’s my code to draw a cube on a GLCanvas:

`import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLContext;
import javax.media.opengl.GLDrawableFactory;
import javax.media.opengl.glu.GLU;
import javax.swing.JFrame;

import com.sun.opengl.util.GLUT;

public class Viewer {
public static void main(String[] args) {
JFrame mainFrame = new JFrame();
GLCanvas canvas = new GLCanvas();
canvas.setSize(300, 300);

	GLContext drawingContext = canvas.getContext();
	drawingContext.makeCurrent();
	GLUT glut = new GLUT();
	glut.glutSolidCube(1.0f);
	mainFrame.add(canvas);
	mainFrame.pack();
	mainFrame.setVisible(true);
}

}`

and here’s my error:

Exception in thread "main" javax.media.opengl.GLException: No OpenGL context current on this thread at javax.media.opengl.glu.GLU.getCurrentGL(GLU.java:234) at com.sun.opengl.util.GLUT.glutSolidCube(GLUT.java:212) at Viewer.main(Viewer.java:20)

Now i tried to set the current GLcontext for my thread using drawingContext.makeCurrent().
As you can see it does not work. Can anybody tell me how this is done? ???

#2

Oh yeah I’m using JSR-231 btw. That’s part of the problem, because I’m used to using the deprecated APIs which look more C like!

#3

Uh, look at the jogl tutorial…things are not done that way :wink:

#4

More specifically, the problem is that the “main” thread, is not a proper OpenGL rendering thread. The JOGL tutorial will show you how to create a class which can participate in OpenGL rendering, by using one of the JOGL utility classes.