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

import com.sun.opengl.util.Animator;
import com.sun.opengl.util.BufferUtil;
import com.sun.opengl.util.j2d.TextRenderer;
import javax.media.opengl.GL;
import javax.media.opengl.GLCanvas;
import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;

public class HelloWorldDemo extends Frame implements GLEventListener{
    
    private static final long serialVersionUID = 1L;
    private TextRenderer textRenderer;
    private int[] id=new int[1];
    private FloatBuffer buffer=BufferUtil.newFloatBuffer(0);
    
    public HelloWorldDemo(){
        super("JOGL 1.1.1");
        setLayout(new BorderLayout());
        setSize(400, 400);
        setLocation(40, 40);
        setVisible(true);
        GLCapabilities caps = new GLCapabilities();
        caps.setDoubleBuffered(true);
        caps.setHardwareAccelerated(true);
        GLCanvas canvas = new GLCanvas(caps);
        canvas.addGLEventListener(this);
        add(canvas, BorderLayout.CENTER);
        Animator anim = new Animator(canvas);
        anim.start();
        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                System.exit(0);
            }
        });
        buffer.put(new float[]{});
        buffer.position(0);
    }

    
    public void init(GLAutoDrawable drawable){
        GL gl = drawable.getGL();
        gl.glClearColor(0, 0, 0, 0);
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glOrtho(0, 1, 0, 1, -1, 1);
        textRenderer=new TextRenderer(new Font("SansSerif",Font.PLAIN,12));
        gl.glGenBuffers(1,id,0);
        gl.glBindBuffer(GL.GL_ARRAY_BUFFER,id[0]);
        gl.glBufferData(GL.GL_ARRAY_BUFFER,BufferUtil.SIZEOF_FLOAT*buffer.capacity(),buffer,GL.GL_STATIC_DRAW_ARB);
        this.buffer.position(0);
    }

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

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

    public void display(GLAutoDrawable drawable){
        GL gl = drawable.getGL();
        gl.glClear(GL.GL_COLOR_BUFFER_BIT);
        gl.glEnableClientState(GL.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL.GL_TEXTURE_COORD_ARRAY);
        gl.glBindBuffer(GL.GL_ARRAY_BUFFER,id[0]);
        gl.glDrawArrays(GL.GL_QUADS,0,0);
        gl.glDisableClientState(GL.GL_TEXTURE_COORD_ARRAY);       
        gl.glDisableClientState(GL.GL_VERTEX_ARRAY);
        textRenderer.beginRendering(100,100);
        textRenderer.draw("JOGL 1.1.1",0,0);
        textRenderer.endRendering();       
        gl.glFlush();
    }

    public static void main(String[] args){
        HelloWorldDemo demo = new HelloWorldDemo();
        demo.setVisible(true);
    }
}