Java + OpenGL = JOGL

1. Java and OpenGL Rich Truban Andrew Potozniak Java + OpenGL = JOGL

2. Getting Started Java 5 SDK http://java.sun.com/j2se/1.5.0/download.jsp Eclipse IDE http://www.eclipse.org/ (http://download.eclipse.org/eclipse/downloads/drops/R-3.0.1-200409161125/eclipse-SDK-3.0.1-win32.zip) JOGL’s Main site https://jogl.dev.java.net/

3. Installing JOGL • Download: • The JAR file: • jogl.jar • The Natives: • jogl-natives-linux.jar • jogl-natives-win32.jar

4. Installing JOGL into the JRE • Find the directory where your JRE is installed. • Windows & Linux (Global Install) • Drop the JOGL.jar file into: • jre1.5.0/lib/ext/ • Drop the natives into: • jre1.5.0/bin/

5. Incorporating JOGL into Eclipse • Make a new Java Project • Create a lib/ directory • Import the sample code • Drop JOGL.jar into the lib directory • You can drop the natives into this directory as well. • Had to do this as well as another little trick to make JOGL work in Linux.

6. Simple JOGL test code public class JOGLTest { public static void main(String args[]) { try { //Load the libraries System.loadLibrary("jogl"); System.out.println("Hello World! (The native libraries are installed.)"); //Test for the presence of the JAR GLCapabilities glCaps = new GLCapabilities(); System.out.println("Hello JOGL! (The jar appears to be available.)"); } catch (Exception e) { System.out.println(e); } } }

7. Testing JOGL • Run the sample program • If it fails, make sure you installed the JOGL.jar and JOGL natives in the correct places. • If it runs, you’re well on your way to make OGL programs in Java

8. Setting up a GLCanvas public class Main extends JFrame { private static GLCanvas glCanvas; private GraphicEngine ge; public Main() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); GLCapabilities glCaps = new GLCapabilities(); glCaps.setDoubleBuffered(true); glCaps.setHardwareAccelerated(true); glCanvas = GLDrawableFactory.getFactory().createGLCanvas(glCaps); ge = new GraphicEngine(); glCanvas.addGLEventListener(ge); getContentPane().add(glCanvas); setSize(640, 480); } public static void main(String args[]) { Main main = new Main(); main.setVisible(true); while(true){glCanvas.repaint();} } }

9. Setting up the GLEventListener public class GraphicEngine implements GLEventListener{ public void init(GLDrawable gld){ gld.getGL().glClearColor(0.0f, 0.0f, 0.0f, 1.0f); } public void display(GLDrawable gld){ GL gl = gld.getGL(); GLU glu = gld.getGLU(); GLUT glut = new GLUT(); gl.glClear(GL.GL_COLOR_BUFFER_BIT); gl.glLoadIdentity(); } //Have to implement these methods for the GLEventListener public void displayChanged(GLDrawable gld, boolean arg1, boolean arg2) { } public void reshape(GLDrawable gld, int x, int y, int width, int height) { } }

10. Any questions so far? Except for that one Anton! Why did we do that? Because we can!

11. Let’s add some spice to the mix! • Adding a GL_QUADS call • Adding a GLUT object

12. Advantages of using Java • User-friendly and Robust Development Environment • Platform independent • Javadoc API (http://java.sun.com/j2se/1.5.0/docs/api/) • Let’s just face it. It’s a lot better than Python <smirk>