JOGL init() method not being called

Newbie & Debugging Questions
#1

I have been working on a JOGL program for a few weeks, and I found that the init() method in my event listener is never being called. If anyone could help me out with this I would greatly appreciate it.

Main Class:


package mainLoop;

import javax.media.opengl.GLCapabilities;
import javax.media.opengl.GLDrawableFactory;
import javax.media.opengl.GLProfile;
import javax.media.opengl.awt.GLCanvas;
import javax.swing.JFrame;
import javax.swing.JPanel;

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

public class MainFrame extends JFrame {

	public static MainFrame frame;
	public static JPanel panel;
	public static GLCapabilities glCaps;
	public static GLCanvas canvas;
	public static FPSAnimator animator;
	
	public MainFrame(String s)
	{
		super(s);
	}

	public static void main(String[] args)
	{
		frame = new MainFrame("GL Test");
		frame.setSize(1280, 720);
		panel = new JPanel();
		panel.setSize(1280, 720);
		frame.add(panel);
		frame.setDefaultCloseOperation(MainFrame.EXIT_ON_CLOSE);
		GLProfile.initSingleton();
		glCaps = new GLCapabilities(GLProfile.get(GLProfile.GL3));
		canvas = new GLCanvas(glCaps);
		canvas.addGLEventListener(new JOGLEventListener());
		animator = new FPSAnimator(60);
		panel.add(canvas);
		animator.add(canvas);
		animator.start();
		frame.setVisible(true);
	}
}

Event Listener Class:


package mainLoop;

import java.io.IOException;
import java.nio.FloatBuffer;

import javax.media.opengl.GL;
import javax.media.opengl.GL2ES2;
import javax.media.opengl.GL3;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.fixedfunc.GLMatrixFunc;

import com.jogamp.opengl.util.PMVMatrix;

import shaders.ShaderLoader;

public class JOGLEventListener implements GLEventListener{
	
	GL3 gl;

	@Override
	public void display(GLAutoDrawable arg0)
	{
		gl = (GL3) arg0.getGL();
		gl.glDrawArrays(GL.GL_TRIANGLES, 0, 3);
	}

	@Override
	public void dispose(GLAutoDrawable arg0)
	{
		
		
	}

	@Override
	public void init(GLAutoDrawable gld)
	{
		gl = (GL3) gld.getGL();
		int[] array = new int[1];
		gl.glGenVertexArrays(1, array, 0);
		gl.glBindVertexArray(array[0]);
		gl.glEnable(GL.GL_DEPTH_TEST);
		gl.glDepthFunc(GL.GL_LEQUAL);
		int[] buffer = new int[1]; 
		gl.glGenBuffers(1, buffer, 0); 
		gl.glBindBuffer(GL.GL_ARRAY_BUFFER, buffer[0]);
		FloatBuffer vertices = FloatBuffer.allocate(9);
		vertices.put(1);
		vertices.put(0);
		vertices.put(-3);
		vertices.put(0);
		vertices.put(0);
		vertices.put(-3);
		vertices.put(0);
		vertices.put(1);
		vertices.put(-3);
		vertices.rewind();
		gl.glBufferData(GL.GL_ARRAY_BUFFER, 12 * Float.BYTES, vertices, GL.GL_STATIC_DRAW);
		try {
			gl = ShaderLoader.getShaderProgram((GL3) gl);
		} catch (IOException e) {
			System.exit(0);
			e.printStackTrace();
		}
		//make matrices
		PMVMatrix matrixMaker = new PMVMatrix();
		matrixMaker.gluLookAt(10, 10, 10, 0, 0, 0, -1, -1, 1);
		matrixMaker.gluPerspective(90, 16.0f/9.0f, 0.1f, 100);
		//apply to uniform
		int tempLoc = gl.glGetUniformLocation(ShaderLoader.finalShader, "uniform_Projection");
		gl.glUniformMatrix4fv(tempLoc, 1, false, matrixMaker.glGetMatrixf());
		//set up attributes
		tempLoc = gl.glGetAttribLocation(ShaderLoader.finalShader, "attribute_Position");
		gl.glVertexAttribPointer(tempLoc, 3, GL.GL_FLOAT, false, 0, 0);
		gl.glEnableVertexAttribArray(array[0]);
	}

	@Override
	public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int arg3, int arg4)
	{
		
	}
	
	
	
	

}

If it helps, I am using java 8 on windows 8.1

#2

You may get more bites over at the jogl webpage, but couple things that might trigger it.

First you should probably call request focus on the canvas. Also, I see you are setting the panel size, but aren’t setting the canvas size. You should be sure to set the size or it won’t look like you’re rendering anything.

#3

Thanks for the help! It didn’t render anything but now the functions are being called.

I’ll ask any additional questions on the JOGL forums, I honestly didn’t even know there was such a thing.

#4

The only reason I mention it is because I think it’s frowned upon here, not sure. I use jogl, but I still come here for openGL specific questions, good luck!

#5

How do you know init() isn’t being called? I did notice one thing odd about it, you’re calling System.exit before printing the stack trace within the catch block around ShaderLoader.getShaderProgram(). This will prevent you from seeing the errors that get caught. Swap these around so you print before exit.