superbible sample code copied to JOGL, yet not working

OpenGL Development
#1

I wrote some sample code from superbible to JOGL, but it did not work(there should be a triangle, yet there is nothing but only green background). I guess the problem is the method “glDrawArrays()”. Please take a look at the code below. Great thanks for any help!!

import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.nio.IntBuffer;

import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

import com.jogamp.opengl.util.FPSAnimator;
import com.jogamp.opengl.util.GLBuffers;

public class TestVerAttributes extends GLCanvas implements GLEventListener
{
private static final long serialVersionUID = 1L;

// Define constants for the top-level container
private static String TITLE = "Test glsl";
private static final int CANVAS_WIDTH = 320;  // width of the drawable
private static final int CANVAS_HEIGHT = 240; // height of the drawable
private static final int FPS = 60; // animator's target frames per second

private IntBuffer vaoNameBuff = GLBuffers.newDirectIntBuffer(1);
private int shaderProgram;
private float green[] = { 0.0f, 0.25f, 0.0f, 1.0f };

//private float temp;

public TestVerAttributes()
{
	addGLEventListener(this);
}

public void init(GLAutoDrawable drawable)
{
	GL2 gl = drawable.getGL().getGL2();
	
	initShaders(gl);
}

public void initShaders(GL2 gl)
{
	int verShader = gl.glCreateShader(GL2.GL_VERTEX_SHADER);
	int fraShader = gl.glCreateShader(GL2.GL_FRAGMENT_SHADER);
	
	String[] vsrc = 
		{
			"#version 400 core						\n" + 
			"void main(void)						\n" + 
			"{										\n" + 
			"	const vec4 vertices[] = vec4[](vec4(0.25, -0.25, 0.5, 1), \n" + 
			"	vec4(-0.25, -0.25, 0.5, 1),			\n" + 
			"	vec4( 0.25, 0.25, 0.5, 1));			\n" + 
			"	gl_Position = vertices[gl_VertexID];	\n" + 
			"}"
		};
	
	gl.glShaderSource(verShader, 1, vsrc, null);
	gl.glCompileShader(verShader);
	
	String[] fsrc = 
		{
			"#version 400 core		\n" + 
			"void main( void)		\n" + 
			"{						\n" + 
			"	gl_FragColor = vec4(0.0, 0.8, 1.0, 1.0)	\n" + 
			"}"
		};
	
	gl.glShaderSource(fraShader, 1, fsrc, null);
	gl.glCompileShader(fraShader);
	
	shaderProgram = gl.glCreateProgram();
	gl.glAttachShader(shaderProgram, verShader);
	gl.glAttachShader(shaderProgram, fraShader);
	gl.glLinkProgram(shaderProgram);
	gl.glValidateProgram(shaderProgram);
	
	gl.glGenVertexArrays(1, vaoNameBuff);
	gl.glBindVertexArray(vaoNameBuff.get(0));
}

public void dispose(GLAutoDrawable drawable)
{
	GL2 gl = drawable.getGL().getGL2();
	
	gl.glDeleteVertexArrays(1, vaoNameBuff);
	gl.glDeleteProgram(shaderProgram);
}

public void display(GLAutoDrawable drawable)
{
	GL2 gl = drawable.getGL().getGL2();
	
	/*float attrib[] = {
			(float) Math.sin(temp) * 0.5f,
			(float) Math.cos(temp) * 0.6f,
			0.0f, 0.0f
			};
	
	if (temp < 3.14f)
	{
		temp += 0.01f;
	}
	else
	{
		temp = 0f;
	}*/
	
	gl.glClearBufferfv(GL2.GL_COLOR, 0, green, 0);
	gl.glUseProgram(shaderProgram);
	//gl.glVertexAttrib4fv(0, attrib, 0);
	gl.glDrawArrays(GL.GL_TRIANGLES, 0, 3);
}

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

/** The entry main() method to setup the top-level container and animator */
public static void main(String[] args)
{
	// Run the GUI codes in the event-dispatching thread for thread safety
	SwingUtilities.invokeLater(new Runnable()
	{
		public void run()
		{
			// Create the OpenGL rendering canvas
            GLCanvas canvas = new TestVerAttributes();
            canvas.setPreferredSize(new Dimension(CANVAS_WIDTH, CANVAS_HEIGHT));

            // Create a animator that drives canvas' display() at the specified FPS. 
            final FPSAnimator animator = new FPSAnimator(canvas, FPS, true);
            
            // Create the top-level container
            final JFrame frame = new JFrame(); // Swing's JFrame or AWT's Frame
            frame.getContentPane().add(canvas);
            frame.addWindowListener(new WindowAdapter()
            {
            	public void windowClosing(WindowEvent e)
            	{
            		// Use a dedicate thread to run the stop() to ensure that the
            		// animator stops before program exits.
            		new Thread()
            		{
            			public void run()
            			{
            				if (animator.isStarted())
            				{
            					animator.stop();
            				}
            				System.exit(0);
            			}
            		}.start();
            	}
            });
            frame.setTitle(TITLE);
            frame.pack();
            frame.setVisible(true);
            animator.start(); // start the animation loop
		}
	});
}

}