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This program demonstrates using mipmaps for texture maps. To overtly show the effect of mipmaps, each mipmap reduction level has a solidly colored, contrasting texture image. Thus, the quadrilateral which is drawn is drawn with several different colors.
The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").
-> Copyright and Permission Notice
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 demonstrates using mipmaps for texture maps. To overtly show the
* effect of mipmaps, each mipmap reduction level has a solidly colored,
* contrasting texture image. Thus, the quadrilateral which is drawn is drawn
* with several different colors.
*
* @author Kiet Le
*/
public class mipmap
extends JFrame
implements GLEventListener, KeyListener
{
private GLU glu;
private GLCapabilities caps;
private GLCanvas canvas;
private static final int color = 3;
// private byte mipmapImage32[][][] = new byte[32][32][color];
// private byte mipmapImage16[][][] = new byte[16][16][color];
// private byte mipmapImage8[][][] = new byte[8][8][color];
// private byte mipmapImage4[][][] = new byte[4][4][color];
// private byte mipmapImage2[][][] = new byte[2][2][color];
private byte mipmapImage1[][][] = new byte[1][1][color];
private ByteBuffer mipmapImage32Buf = BufferUtil
.newByteBuffer(32 * 32 * color);
private ByteBuffer mipmapImage16Buf = BufferUtil
.newByteBuffer(16 * 16 * color);
private ByteBuffer mipmapImage8Buf = BufferUtil.newByteBuffer(8 * 8 * color);
private ByteBuffer mipmapImage4Buf = BufferUtil.newByteBuffer(4 * 4 * color);
private ByteBuffer mipmapImage2Buf = BufferUtil.newByteBuffer(2 * 2 * color);
private ByteBuffer mipmapImage1Buf = BufferUtil.newByteBuffer(1 * 1 * color);
public mipmap()
{
super("mipmap");
caps = new GLCapabilities();
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 mipmap().run();
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
glu = new GLU();
gl.glEnable(GL.GL_DEPTH_TEST);
gl.glDepthFunc(GL.GL_LESS);
gl.glShadeModel(GL.GL_FLAT);
gl.glTranslatef(0.0f, 0.0f, -3.6f);
makeImages();
gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, 3, 32, 32, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage32Buf);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 1, 3, 16, 16, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage16Buf);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 2, 3, 8, 8, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage8Buf);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 3, 3, 4, 4, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage4Buf);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 4, 3, 2, 2, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage2Buf);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 5, 3, 1, 1, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE,
mipmapImage1Buf);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_REPEAT);
gl.glTexParameterf(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_REPEAT);
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_MIPMAP_NEAREST);
gl.glTexEnvf(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_DECAL);
gl.glEnable(GL.GL_TEXTURE_2D);
}
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, 8.0f);
gl.glVertex3f(-2.0f, 1.0f, 0.0f);
gl.glTexCoord2f(8.0f, 8.0f);
gl.glVertex3f(2000.0f, 1.0f, -6000.0f);
gl.glTexCoord2f(8.0f, 0.0f);
gl.glVertex3f(2000.0f, -1.0f, -6000.0f);
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, 30000.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
/*
* 3D arrays are never used by gl command TexImage2D. it instead use byte
* buffer.
*/
private void makeImages()
{
int i, j;
for (i = 0; i < 32; i++)
{
for (j = 0; j < 32; j++)
{
// mipmapImage32[i][j][0] = (byte) 255;
// mipmapImage32[i][j][1] = (byte) 255;
// mipmapImage32[i][j][2] = (byte) 0;
//
mipmapImage32Buf.put((byte) 255);
mipmapImage32Buf.put((byte) 255);
mipmapImage32Buf.put((byte) 0);
}
}
for (i = 0; i < 16; i++)
{
for (j = 0; j < 16; j++)
{
// mipmapImage16[i][j][0] = (byte) 255;
// mipmapImage16[i][j][1] = (byte) 0;
// mipmapImage16[i][j][2] = (byte) 255;
//
mipmapImage16Buf.put((byte) 255);
mipmapImage16Buf.put((byte) 0);
mipmapImage16Buf.put((byte) 255);
}
}
for (i = 0; i < 8; i++)
{
for (j = 0; j < 8; j++)
{
// mipmapImage8[i][j][0] = (byte) 255;
// mipmapImage8[i][j][1] = (byte) 0;
// mipmapImage8[i][j][2] = (byte) 0;
//
mipmapImage8Buf.put((byte) 255);
mipmapImage8Buf.put((byte) 0);
mipmapImage8Buf.put((byte) 0);
}
}
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
// mipmapImage4[i][j][0] = (byte) 0;
// mipmapImage4[i][j][1] = (byte) 255;
// mipmapImage4[i][j][2] = (byte) 0;
//
mipmapImage4Buf.put((byte) 0);
mipmapImage4Buf.put((byte) 255);
mipmapImage4Buf.put((byte) 0);
}
}
for (i = 0; i < 2; i++)
{
for (j = 0; j < 2; j++)
{
// mipmapImage2[i][j][0] = (byte) 0;
// mipmapImage2[i][j][1] = (byte) 0;
// mipmapImage2[i][j][2] = (byte) 255;
//
mipmapImage2Buf.put((byte) 0);
mipmapImage2Buf.put((byte) 0);
mipmapImage2Buf.put((byte) 255);
}
}
// mipmapImage1[0][0][0] = (byte) 255;
// mipmapImage1[0][0][1] = (byte) 255;
// mipmapImage1[0][0][2] = (byte) 255;
//
mipmapImage1Buf.put((byte) 255);
mipmapImage1Buf.put((byte) 255);
mipmapImage1Buf.put((byte) 255);
// rewind all
mipmapImage32Buf.rewind();
mipmapImage16Buf.rewind();
mipmapImage8Buf.rewind();
mipmapImage4Buf.rewind();
mipmapImage2Buf.rewind();
mipmapImage1Buf.rewind();
}
public void keyTyped(KeyEvent key)
{
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyChar()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent key)
{
}
}
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Source:
Kiet Le's The Red Book Examples using JOGL
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