package glredbook10;
import java.awt.event.*;
import javax.swing.*;
import java.nio.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
/**
* This program texture maps a checkerboard image onto two rectangles. This
* program clamps the texture, if the texture coordinates fall outside 0.0 and
* 1.0.
*
* @author Kiet Le
*/
public class checker
extends JFrame
implements GLEventListener, KeyListener
{
private GLU glu;
private GLCapabilities caps;
private GLCanvas canvas;
/* Create checkerboard texture */
private static final int checkImageWidth = 64;
private static final int checkImageHeight = 64;
private static final int color = 3;
private byte checkImage[][][] = new byte[checkImageWidth][checkImageHeight][color];
private ByteBuffer checkImageBuf = //
BufferUtil.newByteBuffer(checkImageHeight * checkImageWidth * color);
public checker()
{
super("checker");
caps = new GLCapabilities();
// caps.setSampleBuffers(true );
canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);
canvas.addKeyListener(this);
getContentPane().add(canvas);
}
public void run()
{
setSize(500, 500);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
canvas.requestFocusInWindow();
}
public static void main(String[] args)
{
new checker().run();
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
glu = new GLU();
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glDepthFunc(GL.GL_LESS);
makeCheckImage();
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, color, checkImageWidth, checkImageHeight, 0,
GL.GL_RGB, GL.GL_UNSIGNED_BYTE, checkImageBuf);// checkImage[0][0][0]);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
gl.glTexEnvf(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_DECAL);
gl.glEnable(GL.GL_TEXTURE_2D);
gl.glShadeModel(GL.GL_FLAT);
}
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glBegin(GL.GL_QUADS);
gl.glTexCoord2f(0.0f, 0.0f);
gl.glVertex3f(-2.0f, -1.0f, 0.0f);
gl.glTexCoord2f(0.0f, 1.0f);
gl.glVertex3f(-2.0f, 1.0f, 0.0f);
gl.glTexCoord2f(1.0f, 1.0f);
gl.glVertex3f(0.0f, 1.0f, 0.0f);
gl.glTexCoord2f(1.0f, 0.0f);
gl.glVertex3f(0.0f, -1.0f, 0.0f);
gl.glTexCoord2f(0.0f, 0.0f);
gl.glVertex3f(1.0f, -1.0f, 0.0f);
gl.glTexCoord2f(0.0f, 1.0f);
gl.glVertex3f(1.0f, 1.0f, 0.0f);
gl.glTexCoord2f(1.0f, 1.0f);
gl.glVertex3f(2.41421f, 1.0f, -1.41421f);
gl.glTexCoord2f(1.0f, 0.0f);
gl.glVertex3f(2.41421f, -1.0f, -1.41421f);
gl.glEnd();
gl.glFlush();
}
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
{
GL gl = drawable.getGL();
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(60.0, 1.0 * (float) w / (float) h, 1.0, 30.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -3.6f);
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
/*
* 3D array won't be used. I left it here for you to see.
*/
private void makeCheckImage()
{
byte c = (byte) 0xFF;
for (int i = 0; i < checkImageWidth; i++)
{
for (int j = 0; j < checkImageHeight; j++)
{
// c = ((((i & 0x8) == 0) ^ ((j & 0x8)) == 0)) * 255;
c = (byte)( ( ((byte)((i & 0x8)==0?0x00:0xff)//
^(byte)((j & 0x8)==0?0x00:0xff))));
checkImage[i][j][0] = (byte) c;
checkImage[i][j][1] = (byte) c;
checkImage[i][j][2] = (byte) c;
checkImageBuf.put((byte) c);
checkImageBuf.put((byte) c);
checkImageBuf.put((byte) c);
}
}
checkImageBuf.rewind();
}//
public void keyTyped(KeyEvent key)
{
// TODO Auto-generated method stub
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyChar()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent key)
{
// TODO Auto-generated method stub
}
}
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