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/**
*
*/
package glredbook1314;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import javax.media.opengl.*;
import javax.swing.JFrame;
import com.sun.opengl.util.BufferUtil;
import javax.media.opengl.awt.GLJPanel;
import javax.media.opengl.glu.GLU;
/**
* This program demonstrates multiple vertex arrays, specifically the OpenGL
* routine glMultiDrawElements(), but it's a bitch to setup--so I use
* DrawElements in a loop instead.
*
* @author Kiet Le (Java port) Ported to JOGL 2.x by Claudio Eduardo Goes (JOGL port)
*/
public class mvarray //
implements GLEventListener //
, KeyListener {
private GLU glu;
private int vertices[] = { 25, 25,//
75, 75,//
100, 125,//
150, 75,//
200, 175,//
250, 150,//
300, 125,//
100, 200,//
150, 250,//
200, 225,//
250, 300,//
300, 250 };
private IntBuffer vertexBuf = //
BufferUtil.newIntBuffer(vertices.length);
private byte oneIndices[] = { 0, 1, 2, 3, 4, 5, 6 };
private byte twoIndices[] = { 1, 7, 8, 9, 10, 11 };
private int count[] = { 7, 6 };
private ByteBuffer indices[] = {//
BufferUtil.newByteBuffer(oneIndices.length),
BufferUtil.newByteBuffer(twoIndices.length) };
// static GLvoid * indices[2] = {oneIndices, twoIndices};
{
vertexBuf.put(vertices);
indices[0].put(oneIndices);
indices[1].put(twoIndices);
vertexBuf.rewind();
indices[0].rewind();
indices[1].rewind();
}
private boolean mde_bug;
/**
*
*/
public mvarray() {
}
private void setupPointer(GL2 gl) {
gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
gl.glVertexPointer(2, GL2.GL_INT, 0, vertexBuf);
}
/*
* (non-Javadoc)
*
* @see javax.media.opengl.GLEventListener#display(javax.media.opengl.GLAutoDrawable)
*/
public void display(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();
//
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glColor3f(1.0f, 1.0f, 1.0f);
if (mde_bug)
gl.glMultiDrawElements(GL.GL_LINE_STRIP, count, 0,//
GL.GL_UNSIGNED_BYTE, indices, 2);
else {
// workaround for glMultiDrawElem bug before July
for (int i = 0; i < indices.length; i++)
gl.glDrawElements(GL.GL_LINE_STRIP, count[i], //
GL.GL_UNSIGNED_BYTE, indices[i]);
}
gl.glFlush();
}
/*
* (non-Javadoc)
*
* @see javax.media.opengl.GLEventListener#displayChanged(javax.media.opengl.GLAutoDrawable,
* boolean, boolean)
*/
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged) {
}
/*
* (non-Javadoc)
*
* @see javax.media.opengl.GLEventListener#init(javax.media.opengl.GLAutoDrawable)
*/
public void init(GLAutoDrawable drawable) {
final GL2 gl = drawable.getGL().getGL2();
glu = new GLU();
//
mde_bug = !gl.isFunctionAvailable("glMultiDrawElements");
System.out.println("glMultiDrawElements bug: " + mde_bug);
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glShadeModel(GL2.GL_SMOOTH);
setupPointer(gl);
}
/*
* (non-Javadoc)
*
* @see javax.media.opengl.GLEventListener#reshape(javax.media.opengl.GLAutoDrawable,
* int, int, int, int)
*/
public void reshape(GLAutoDrawable drawable, int x, int y, //
int width, int height) {
final GL2 gl = drawable.getGL().getGL2();
//
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluOrtho2D(0.0, (double) width, 0.0, (double) height);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
}
/**
* @param args
*/
public static void main(String[] args) {
GLCapabilities caps = new GLCapabilities(null);
caps.setSampleBuffers(true);
GLJPanel canvas = new GLJPanel(caps);
mvarray demo = new mvarray();
canvas.addGLEventListener(demo);
canvas.addKeyListener(demo);
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("mvarray");
frame.setSize(350, 350);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(canvas);
frame.setVisible(true);
frame.setFocusable(false);
canvas.requestFocusInWindow();
}
public void keyPressed(KeyEvent e) {
switch (e.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
public void dispose(GLAutoDrawable arg0) {
}
}
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