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/*
* Portions Copyright (C) 2003 Sun Microsystems, Inc.
* All rights reserved.
*/
/*
* Copyright (c) 1993-1999, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
*/
package demos.tess;
/**
* tess.java
* This program demonstrates polygon tessellation.
* Two tesselated objects are drawn. The first is a
* rectangle with a triangular hole. The second is a
* smooth shaded, self-intersecting star.
*
* Note the exterior rectangle is drawn with its vertices
* in counter-clockwise order, but its interior clockwise.
* Note the combineCallback is needed for the self-intersecting
* star. Also note that removing the TessProperty for the
* star will make the interior unshaded (WINDING_ODD).
*
* @author Ported by Nathan Parker Burg, July 2003
*/
import net.java.games.jogl.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class Tess {
public static void main(String[] args) {
try {
Frame frame = new Frame("Tess Demo");
frame.setSize(500, 500);
GLCanvas canvas = GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());
frame.add(canvas);
canvas.addGLEventListener(new TessRenderer());
final Animator animator = new Animator(canvas);
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
// Run this on another thread than the AWT event queue to
// make sure the call to Animator.stop() completes before
// exiting
new Thread(new Runnable() {
public void run() {
animator.stop();
System.exit(0);
}
}).start();
}
});
frame.show();
animator.start();
} catch (Exception e) {
e.printStackTrace();
}
}
public static class TessRenderer implements GLEventListener {
private GL gl;
private GLU glu;
private int startList;
public void init(GLAutoDrawable drawable) {
drawable.setGL(new DebugGL(drawable.getGL()));
gl = drawable.getGL();
glu = drawable.getGLU();
double[][] rect = new double[][]{{50.0, 50.0, 0.0},
{200.0, 50.0, 0.0},
{200.0, 200.0, 0.0},
{50.0, 200.0, 0.0}};
double[][] tri = new double[][]{{75.0, 75.0, 0.0},
{125.0, 175.0, 0.0},
{175.0, 75.0, 0.0}};
double[][] star = new double[][]{{250.0, 50.0, 0.0, 1.0, 0.0, 1.0},
{325.0, 200.0, 0.0, 1.0, 1.0, 0.0},
{400.0, 50.0, 0.0, 0.0, 1.0, 1.0},
{250.0, 150.0, 0.0, 1.0, 0.0, 0.0},
{400.0, 150.0, 0.0, 0.0, 1.0, 0.0}};
gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
startList = gl.glGenLists(2);
GLUtesselator tobj = glu.gluNewTess();
TessCallback tessCallback = new TessCallback(gl, glu);
glu.gluTessCallback(tobj, GLU.GLU_TESS_VERTEX, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_BEGIN, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_END, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_ERROR, tessCallback);
gl.glNewList(startList, GL.GL_COMPILE);
gl.glShadeModel(GL.GL_FLAT);
glu.gluTessBeginPolygon(tobj, null);
glu.gluTessBeginContour(tobj);
glu.gluTessVertex(tobj, rect[0], 0, rect[0]);
glu.gluTessVertex(tobj, rect[1], 0, rect[1]);
glu.gluTessVertex(tobj, rect[2], 0, rect[2]);
glu.gluTessVertex(tobj, rect[3], 0, rect[3]);
glu.gluTessEndContour(tobj);
glu.gluTessBeginContour(tobj);
glu.gluTessVertex(tobj, tri[0], 0, tri[0]);
glu.gluTessVertex(tobj, tri[1], 0, tri[1]);
glu.gluTessVertex(tobj, tri[2], 0, tri[2]);
glu.gluTessEndContour(tobj);
glu.gluTessEndPolygon(tobj);
gl.glEndList();
glu.gluTessCallback(tobj, GLU.GLU_TESS_VERTEX, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_BEGIN, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_END, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_ERROR, tessCallback);
glu.gluTessCallback(tobj, GLU.GLU_TESS_COMBINE, tessCallback);
gl.glNewList(startList + 1, GL.GL_COMPILE);
gl.glShadeModel(GL.GL_SMOOTH);
glu.gluTessProperty(tobj, GLU.GLU_TESS_WINDING_RULE, GLU.GLU_TESS_WINDING_POSITIVE);
glu.gluTessBeginPolygon(tobj, null);
glu.gluTessBeginContour(tobj);
glu.gluTessVertex(tobj, star[0], 0, star[0]);
glu.gluTessVertex(tobj, star[1], 0, star[1]);
glu.gluTessVertex(tobj, star[2], 0, star[2]);
glu.gluTessVertex(tobj, star[3], 0, star[3]);
glu.gluTessVertex(tobj, star[4], 0, star[4]);
glu.gluTessEndContour(tobj);
glu.gluTessEndPolygon(tobj);
gl.glEndList();
glu.gluDeleteTess(tobj);
}//end init
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrtho( 0, 450, 0, 250, -1, 1 );
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
}
public void display(GLAutoDrawable drawable) {
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glColor3d(1.0, 1.0, 1.0);
gl.glCallList(startList);
gl.glCallList(startList + 1);
gl.glFlush();
}
}//end TessRenderer
public static class TessCallback extends net.java.games.jogl.GLUtesselatorCallbackAdapter {
GL gl;
GLU glu;
public TessCallback(GL gl, GLU glu) {
this.gl = gl;
this.glu = glu;
};
public void begin(int type) {
gl.glBegin(type);
}
public void end() {
gl.glEnd();
}
public void vertex(Object data) {
if (data instanceof double[]) {
double[] d = (double[]) data;
if (d.length == 6) {
gl.glColor3dv(d, 3);
}
gl.glVertex3dv(d, 0);
}
}
public void error(int errnum) {
String estring;
estring = glu.gluErrorString(errnum);
System.out.println("Tessellation Error: " + estring);
//System.exit(0);
throw new RuntimeException();
}
public void combine(double[] coords, Object[] data,
float[] weight, Object[] outData) {
double[] vertex = new double[6];
int i;
vertex[0] = coords[0];
vertex[1] = coords[1];
vertex[2] = coords[2];
for (i = 3; i < 6; i++)
vertex[i] = weight[0] * ((double[]) data[0])[i] +
weight[1] * ((double[]) data[1])[i] +
weight[2] * ((double[]) data[2])[i] +
weight[3] * ((double[]) data[3])[i];
outData[0] = vertex;
}
}//End TessCallback
}//End Tess
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