Active rendering with JOGL

Shared Code
#1

NB: this post is due to a question in JOGL board, as it is a shared code, I thought it should be good to post it here too

This explain a simple way to make active rendering with JOGL without GLEventListener

Render class:


import java.awt.*;
import java.awt.event.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;

public final class RenderJOGL 
{	
	private GLContext context;
	private GLCanvas canvas;
	private GL gl;
	private GLU glu;

	public Canvas getCanvas()
	{
		return this.canvas;
	}
	
	public RenderJOGL() throws Throwable
	{
		GLCapabilities glCaps = new GLCapabilities();	
		glCaps.setRedBits(8);
		glCaps.setBlueBits(8);
		glCaps.setGreenBits(8);
		glCaps.setAlphaBits(8);
		glCaps.setDoubleBuffered(true);
		glCaps.setHardwareAccelerated(true);

		this.canvas = new GLCanvas(glCaps);
		this.canvas.setAutoSwapBufferMode(false);
		this.glu=new GLU();

		this.context=this.canvas.getContext();
		this.gl = this.context.getGL();
	}
	
	public void setSize(int viewPixelWidth,int viewPixelHeight)//,int maxAntialias)
	{
		this.canvas.setSize(viewPixelWidth,viewPixelHeight);
	}		
	
	public void render()
	{	
		this.makeContentCurrent();

		this.gl.glDisable(GL.GL_DEPTH_TEST);
		gl.glClearColor(0.0f,0.0f,1.0f,0.0f);	//Background blue
        		gl.glClear(GL.GL_COLOR_BUFFER_BIT);
        		gl.glLoadIdentity();	
        		gl.glColor3f(1.0f, 0.0f, 0.0f);	//Color red
        		gl.glBegin(GL.GL_TRIANGLES);
        		gl.glVertex3f(0,0,0.0f);
        		gl.glVertex3f(1,0,0.0f);
        		gl.glVertex3f(0,1,0.0f);        
        		gl.glEnd();	

        		this.context.release();
		this.canvas.swapBuffers();
	}
	
	private void makeContentCurrent()
	{	
		try 
		{
			while (context.makeCurrent() == GLContext.CONTEXT_NOT_CURRENT) 
			{
				System.out.println("Context not yet current...");
				Thread.sleep(100);
			}
		}
		catch (InterruptedException e)
		{
			 e.printStackTrace(); 
		}
	} 			
}

AppletTest class:

 
import java.awt.*;
import java.applet.*;
import java.io.*;
import java.awt.event.*;

public class AppletTest extends Applet implements Runnable
{
	private int nbloop;
	private RenderJOGL render;
    
	private long startTime;
	private Thread process;
	private int nbStart;
	

	public void init() 
	{
		this.nbStart=0;
	}
	
	public void start() 
	{
		//Ensure that start is only called once
		if(this.nbStart!=0)
			return;
		this.nbStart++;
		
		this.render=new RenderJOGL();		
		
		//Add Render canvas to this applet
		this.setLayout(null);
		Canvas canvas=this.render.getCanvas();
		this.add(canvas);
		this.render.setSize(this.getWidth(),this.getHeight());
		
		//Start rendering Thread
		this.process=new Thread(this);
		this.process.start();
	}
	
	public void run()
	{
		try
		{
			while(true)
			{
				this.render.render(); 
				Thread.sleep(10);
			}
		}
		catch(InterruptedException ie)
		{
		}
	}
		
}

EDIT: Maybe you will have some few modifications to make it works properly, as it is a Class comming from 3DzzD API, simplified for a better understanding, so I havn’t tested it…

let me know if it helps!

#2

Do you really think active rendering can improve the performance? Instead of sharing 3DzzD source code by small pieces, why don’t you open the whole source code???

#3

[quote]Do you really think active rendering can improve the performance?
[/quote]
No, it don’t think it will hugely improve performance but I found that give a better control over the rendering process.

[quote]Instead of sharing 3DzzD source code by small pieces, why don’t you open the whole source code???
[/quote]
hey! :slight_smile: that’s exacly what I was thinking about this week !?, I dont really know the steps to do this, I mean steps to make a project opensourced in a good way ?

what I am affraid about is multiplicity of version, bugs add, and such !?

anyway, you are right I must share the whole and that what I am going to do, just need to found a good way to do that, It will be a lot better experience for user and will give a better control.

any idea to how opensourcing the whole in a good way are welcome, this is not really a world I know ?

#4

Look at my source code, I only put the license (the complete text) in the ZIP and I put a reference to this in each file. I chose the GPL license version 2 to be sure that anyone can use my source code if he accepts to share his own source code too.

#5

Thanks, I will look on it, It may take up to two weeks for me too opensource the whole 3DzzD project as I would like to give public a clean project and because I dont work a lot on it for now as I am quite busy :(.