GLU tesselator port by Pepijn Van Eeckhoudt and Nathan Parker Burg.

git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/../svn-server-sync/jogl-demos/trunk@24 3298f667-5e0e-4b4a-8ed4-a3559d26a5f4

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diff --git a/src/demos/tess/Tess.java b/src/demos/tess/Tess.java
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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+ * Unpublished-- rights reserved under the copyright laws of the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) {
+                    animator.stop();
+                    System.exit(0);
+                }
+            });
+            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(GLDrawable drawable) {
+            gl = drawable.getGL();
+            glu = drawable.getGLU();
+            drawable.setGL(new DebugGL(drawable.getGL()));
+
+            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], 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.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], 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);
+        }//end init
+
+
+        public void reshape(GLDrawable 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(GLDrawable drawable, boolean modeChanged, boolean deviceChanged) {
+        }
+
+        public void display(GLDrawable 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) {
+                    double[] d2 = {d[0], d[1], d[2]};
+                    gl.glVertex3dv(d2);
+                    d2 = new double[]{d[3], d[4], d[5]};
+                    gl.glColor3dv(d2);
+                } else if (d.length == 3) {
+                    gl.glVertex3dv(d);
+                }
+            }
+        }
+
+        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