package glredbook10;
import java.awt.event.*;
import javax.swing.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
/**
* This program demonstrates how to intermix opaque and alpha blended polygons
* in the same scene, by using glDepthMask. Pressing the left mouse button
* toggles the eye position.
*
* @author Kiet Le (Java conversion)
*/
public class alpha3D
extends JFrame
implements GLEventListener, KeyListener, MouseListener
{
private GLU glu;
private GLUT glut;
private GLCapabilities caps;
private GLCanvas canvas;
private boolean eyePosition = false;
public alpha3D()
{
super("alpha3D");
caps = new GLCapabilities();
canvas = new GLCanvas(caps);
canvas.addGLEventListener(this);
canvas.addKeyListener(this);
canvas.addMouseListener(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 alpha3D().run();
}
public void init(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
glu = new GLU();
glut = new GLUT();
float mat_ambient[] =
{ 0.0f, 0.0f, 0.0f, 0.15f };
float mat_specular[] =
{ 1.0f, 1.0f, 1.0f, 0.15f };
float mat_shininess[] =
{ 15.0f };
gl.glMaterialfv(GL.GL_FRONT, GL.GL_AMBIENT, mat_ambient, 0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_SPECULAR, mat_specular, 0);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_SHININESS, mat_shininess, 0);
gl.glEnable(GL.GL_LIGHTING);
gl.glEnable(GL.GL_LIGHT0);
gl.glDepthFunc(GL.GL_LESS);
gl.glEnable(GL.GL_DEPTH_TEST);
}
public void display(GLAutoDrawable drawable)
{
GL gl = drawable.getGL();
float position[] =
{ 0.0f, 0.0f, 1.0f, 1.0f };
float mat_torus[] =
{ 0.75f, 0.75f, 0.0f, 1.0f };
float mat_cylinder[] =
{ 0.0f, 0.75f, 0.75f, 0.15f };
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, position, 0);
gl.glPushMatrix();
if (eyePosition) glu.gluLookAt(0.0, 0.0, 9.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
else glu.gluLookAt(0.0, 0.0, -9.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
gl.glPushMatrix();
gl.glTranslatef(0.0f, 0.0f, 1.0f);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, mat_torus, 0);
glut.glutSolidTorus(0.275, 0.85, 10, 10);
gl.glPopMatrix();
gl.glEnable(GL.GL_BLEND);
gl.glDepthMask(false);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE);
gl.glMaterialfv(GL.GL_FRONT, GL.GL_DIFFUSE, mat_cylinder, 0);
gl.glTranslatef(0.0f, 0.0f, -1.0f);
glut.glutSolidCube(2.0f);// (1.0, 2.0);
gl.glDepthMask(true);
gl.glDisable(GL.GL_BLEND);
gl.glPopMatrix();
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(30.0, (float) w / (float) h, 1.0, 20.0);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged)
{
}
public void keyTyped(KeyEvent key)
{
}
public void keyPressed(KeyEvent key)
{
switch (key.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent key)
{
}
public void mouseClicked(MouseEvent mouse)
{
}
public void mousePressed(MouseEvent mouse)
{
if (mouse.getButton() == MouseEvent.BUTTON1) //
eyePosition = !eyePosition;
canvas.display();
}
public void mouseReleased(MouseEvent mouse)
{
}
public void mouseEntered(MouseEvent mouse)
{
}
public void mouseExited(MouseEvent mouse)
{
}
}
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