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Hi Sven,
Thanks for the response. I looked into this issue some more. I can't get awt components to appear above a GLCanvas on OS X. But I can get it to work on Linux and Windows.
Here is a test case:
import java.awt.*;
import java.awt.event.*;
import javax.media.opengl.*;
import javax.media.opengl.awt.*;
import com.sun.opengl.util.*;
public class Test extends Frame implements GLEventListener
{
Test(boolean useGLCanvas)
{
super("Test");
this.setLayout(null);
final Label label1 = new Label("Hello, World (1).");
label1.setBounds(150, 100, 100, 50);
this.add(label1);
if (useGLCanvas) {
final GLCanvas glCanvas = new GLCanvas();
glCanvas.addGLEventListener(this);
glCanvas.setBounds(0, 0, 400, 400);
this.add(glCanvas);
}
else {
final TestCanvas testCanvas = new TestCanvas();
testCanvas.setBounds(0, 0, 400, 400);
this.add(testCanvas);
}
// Add a second label just in case z-ordering is mysteriously reversed somehow.
final Label label2 = new Label("Hello, World (2).");
label2.setBounds(150, 300, 100, 50);
this.add(label2);
this.setSize(400, 400);
this.setVisible(true);
}
public void display(GLAutoDrawable drawable)
{
GL2 gl = drawable.getGL().getGL2();
gl.glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
gl.glClear(GL2.GL_COLOR_BUFFER_BIT);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrtho(-1.0f, 1.0f, -1.0f, 1.0f, -1.0, 1.0);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glColor3f(0.6f, 0.5f, 0.5f);
gl.glRectf(-0.5f, -0.5f, 0.5f, 0.5f);
gl.glFlush();
}
public void dispose(GLAutoDrawable drawable) {}
public void init(GLAutoDrawable drawable) {}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {}
public static void main(String[] args)
{
// If the argument is true, the frame will create a GLCanvas.
// Otherwise it will create a TestCanvas (for comparison).
Test test = new Test(true);
}
}
class TestCanvas extends Canvas
{
public void paint(Graphics g)
{
// Draw some random stuff.
g.drawLine(0, 0, 400, 400);
g.drawLine(0, 400, 400, 0);
g.fillRect(150, 150, 100, 100);
}
}
I would expect at least one of the labels to be visible, but neither one shows up on OS X. I ran a similar test case on Linux and Windows, and the first label is visible (which is expected).
Am I making a mistake in this test case? Is there some extra setting I need to change to make this work on OS X? Is this an OS X bug? (I tried two different Apple machines, and both exhibited the same behavior.)
> I don't really see the necessity for such a thing,
> since you could achieve many feature via GL rendering, viewport, stencil
> buffer, scissors ..
In my applet, I'd like to use java.awt components like buttons and labels and text areas. And I'd like those components to appear over part of a GLCanvas.
If I can't use java.awt on OS X, I guess I'll look for a library that has implemented similar components in GL. Any suggestions?
> Maybe you like to try NEWT ?
It doesn't look like NEWT has general UI components like the java.awt components, but I could be missing something.
Thanks,
-john.
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