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+/*
+ * Copyright (c) 1993-1997, 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 adverti(float)Math.sing
+ * 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 52.227f.19(c)(2) or subparagraph
+ * (c)(1)(ii) of the Rights in Technical Data and Computer Software
+ * clause at DFARS 252.227f-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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+
+/*
+ *  tess.c
+ *  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).
+ */
+
+import gl4java.utils.glut.*;
+import gl4java.utils.glut.fonts.*;
+
+import gl4java.*;
+import gl4java.awt.*;
+import gl4java.swing.*;
+import java.applet.*;
+import java.awt.*;
+import java.awt.Dimension;
+import java.awt.event.*;
+import java.lang.*;
+import java.util.*;
+
+public  class TessJPanel extends GLJPanel 
+{
+	public static double rect[/*4*/][/*3*/] = 
+	                          {{50.0, 50.0, 0.0},
+				  {200.0, 50.0, 0.0},
+				  {200.0, 200.0f, 0.0},
+				  {50.0, 200.0, 0.0}};
+	public static double tri[/*3*/][/*3*/] = 
+	                        {{75.0, 75.0, 0.0},
+				 {125.0, 175.0, 0.0},
+				 {175.0, 75.0, 0.0}};
+	public static double star[/*5*/][/*6*/] = 
+	                         {{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}};
+
+        protected GLUTFunc glut = null;
+    
+	int startList=-1;
+	boolean exit = false;
+
+	public TessJPanel() {
+	    super();
+	}
+
+	public void init() {
+	    int i;
+	    glut = new GLUTFuncLightImplWithFonts(gl, glu);
+
+	   int tobj;
+
+	   gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+
+	   startList = gl.glGenLists(2);
+
+	   tobj = glu.gluNewTess();
+	   glu.gluTessCallback ( tobj, GLU_TESS_VERTEX, gl,
+				"glVertex3dv", "([D)V",
+				3, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_BEGIN, this,
+				"beginCallback", "(I)V",
+				0, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_END, this,
+				"endCallback", "()V",
+				0, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_ERROR, this,
+				"errorCallback", "(I)V",
+				0, 0, 0, 0, 0);
+
+	   /*  rectangle with triangular hole inside  */
+	   gl.glNewList(startList, GL_COMPILE);
+	   gl.glShadeModel(GL_FLAT);
+	   glu.gluTessBeginPolygon(tobj, (double[])null);
+	      glu.gluTessBeginContour(tobj);
+		 glu.gluTessVertex(tobj, rect[0], rect[0]);
+		 glu.gluTessVertex(tobj, rect[1], rect[1]);
+		 glu.gluTessVertex(tobj, rect[2], rect[2]);
+		 glu.gluTessVertex(tobj, rect[3], rect[3]);
+	      glu.gluTessEndContour(tobj);
+	      glu.gluTessBeginContour(tobj);
+		 glu.gluTessVertex(tobj, tri[0], tri[0]);
+		 glu.gluTessVertex(tobj, tri[1], tri[1]);
+		 glu.gluTessVertex(tobj, tri[2], tri[2]);
+	      glu.gluTessEndContour(tobj);
+	   glu.gluTessEndPolygon(tobj);
+	   gl.glEndList();
+
+	   glu.gluTessCallback ( tobj, GLU_TESS_VERTEX, this,
+				"vertexCallback", "([D)V",
+				6, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_BEGIN, this,
+				"beginCallback", "(I)V",
+				0, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_END, this,
+				"endCallback", "()V",
+				0, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_ERROR, this,
+				"errorCallback", "(I)V",
+				0, 0, 0, 0, 0);
+	   glu.gluTessCallback ( tobj, GLU_TESS_COMBINE, this,
+				"combineCallback", "([D[D[F[D)V",
+				3, 4*6, 4, 6, 0);
+
+	   /*  smooth shaded, self-intersecting star  */
+	   gl.glNewList(startList + 1, GL_COMPILE);
+	   gl.glShadeModel(GL_SMOOTH);
+	   glu.gluTessProperty(tobj, GLU_TESS_WINDING_RULE,
+			   GLU_TESS_WINDING_POSITIVE);
+	   glu.gluTessBeginPolygon(tobj, (double[])null);
+	      glu.gluTessBeginContour(tobj);
+		 glu.gluTessVertex(tobj, star[0], star[0]);
+		 glu.gluTessVertex(tobj, star[1], star[1]);
+		 glu.gluTessVertex(tobj, star[2], star[2]);
+		 glu.gluTessVertex(tobj, star[3], star[3]);
+		 glu.gluTessVertex(tobj, star[4], star[4]);
+	      glu.gluTessEndContour(tobj);
+	   glu.gluTessEndPolygon(tobj);
+	   gl.glEndList();
+
+	   glu.gluDeleteTess(tobj);
+
+	   reshape(getSize().width, getSize().height);
+
+	   glj.gljCheckGL();
+	}
+	
+        public void display()
+	{
+	   if(exit) return;
+
+	   gl.glClear(GL_COLOR_BUFFER_BIT);
+	   gl.glColor3f(1.0f, 1.0f, 1.0f);
+	   gl.glCallList(startList);
+	   gl.glCallList(startList + 1);
+	}
+
+	public void beginCallback(int which)
+	{
+	   gl.glBegin(which);
+	}
+
+	public void errorCallback(int errorCode)
+	{
+	   String       str;
+
+	   gl.glColor3f( 0.9f, 0.9f, 0.9f );
+	   gl.glRasterPos2i( 5, 5 );
+
+	   str = glu.gluErrorString( errorCode );
+
+	   glut.glutBitmapString(glut.GLUT_BITMAP_9_BY_15, str);
+	   exit = true;
+	}
+
+	public void endCallback()
+	{
+	   gl.glEnd();
+	}
+
+	public void vertexCallback(double[/*6*/] vertex)
+	{
+	   double[] col = new double[3];
+	   System.arraycopy(vertex, 3, col, 0, 3);
+
+	   gl.glColor3dv(col);
+	   gl.glVertex3dv(vertex);
+	}
+
+	/*  combineCallback is used to create a new vertex when edges
+	 *  intersect.  coordinate location is trivial to calculate,
+	 *  but weight[4] may be used to average color, normal, or texture
+	 *  coordinate data.  In this program, color is weighted.
+	 */
+	public void combineCallback(double coords[/*3*/],
+			     double vertex_data[/*4x6*/],
+			     float weight[/*4*/], double[/*6*/] dataOut )
+	{
+	   int i;
+
+	   dataOut[0] = coords[0];
+	   dataOut[1] = coords[1];
+	   dataOut[2] = coords[2];
+	   for (i = 3; i < 6; i++)
+	      dataOut[i] = weight[0] * vertex_data[0*6+i]
+			  + weight[1] * vertex_data[1*6+i]
+			  + weight[2] * vertex_data[2*6+i]
+			  + weight[3] * vertex_data[3*6+i];
+	}
+
+	public void reshape(int w, int h)
+	{
+	   gl.glViewport( 0, 0, w, h );
+
+	   gl.glMatrixMode( GL_PROJECTION );
+	   gl.glLoadIdentity();
+	   glu.gluOrtho2D(0.0f, (double) w, 0.0f, (double) h);
+	}
+}