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1  Java Game APIs & Engines / JOGL Development / Re: How to: Getting started with JOGL on: 2005-12-10 23:56:24
Test.java

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import net.java.games.jogl.*;

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Test
{
    public static void main( String[] args )
    {
        try
        {
            Frame testFrame = new Frame("TestFrame");
            testFrame.setSize( 512, 384 );

            GLCapabilities glCaps = new GLCapabilities();
            glCaps.setRedBits(8);
            glCaps.setBlueBits(8);
            glCaps.setGreenBits(8);
            glCaps.setAlphaBits(8);

            GLCanvas canvas = GLDrawableFactory.getFactory().createGLCanvas( glCaps );

            testFrame.add( canvas );

            canvas.addGLEventListener(new TestRenderer());

            final Animator animator = new Animator( canvas);
            testFrame.addWindowListener(new WindowAdapter() {
                public void windowClosing(WindowEvent e) {
                  animator.stop();
                  System.exit(0);
                }
              });
            testFrame.show();
            animator.start();
        }
        catch( Exception e )
        {
            e.printStackTrace();
        }
    }
}


TestRenderer.java

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import net.java.games.jogl.GLEventListener;
import net.java.games.jogl.GL;
import net.java.games.jogl.GLDrawable;
import net.java.games.jogl.DebugGL;


public class TestRenderer implements GLEventListener
{
    private GL              gl;
    private GLDrawable      glDrawable;

    public void init(GLDrawable drawable)
    {
        this.gl = drawable.getGL();
        this.glDrawable = drawable;

        drawable.setGL( new DebugGL(drawable.getGL() ));

        System.out.println("Init GL is " + gl.getClass().getName());
    }

    public void display(GLDrawable drawable)
    {
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT );
        gl.glLoadIdentity();

        gl.glColor3f(1.0f, 0.0f, 0.0f );

        gl.glBegin( GL.GL_TRIANGLES );
            gl.glVertex3f( 0.0f, 0.0f, 0.0f );
            gl.glVertex3f( 1.0f, 0.0f, 0.0f );
            gl.glVertex3f( 1.0f, 1.0f, 0.0f );
        gl.glEnd();
    }

    public void reshape(GLDrawable drawable, int x, int y, int width, int height)
    {
    }

    public void displayChanged(GLDrawable drawable, boolean modeChanged, boolean deviceChanged)
    {
    }

}


Hi there,
sorry for the huge post.

This code works perfectly, but, if I change the block
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       gl.glBegin( GL.GL_TRIANGLES );
           gl.glVertex3f( 0.0f, 0.0f, 0.0f );
           gl.glVertex3f( 1.0f, 0.0f, 0.0f );
           gl.glVertex3f( 1.0f, 1.0f, 0.0f );
       gl.glEnd();

for
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      gl.glBegin( gl.GL_QUADS );
         gl.glVertex2i(100, 150);
         gl.glVertex2i(100, 100);
         gl.glColor3f(0.0f, 0.0f, 1.0f);
         gl.glVertex2i(150, 100);
         gl.glVertex2i(150, 150);        
      gl.glEnd();

it just doen´t do nothing ... (nothing but a black screen)
The only thing that changed was the fact that it is no longer a GL_TRIANGLE and it is glVertex2i instead of glVertex3f.
I am a newbie on OpenGL, so I would think it is wierd if I missed something on the rest of the code ...

Thanks for your attention and time,

Have a nice day,

 - Inácio Ferrarini.
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