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diff --git a/progs/redbook/stencil.c b/progs/redbook/stencil.c
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+
+/* Copyright (c) Mark J. Kilgard, 1994. */
+
+/*
+ * (c) Copyright 1993, 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+ * Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
+ */
+/*  stencil.c
+ *  This program draws two rotated tori in a window.  
+ *  A diamond in the center of the window masks out part 
+ *  of the scene.  Within this mask, a different model 
+ *  (a sphere) is drawn in a different color.
+ */
+#include <stdlib.h>
+#include <GL/glut.h>
+
+#define YELLOWMAT   1
+#define BLUEMAT 2
+
+void myinit (void) 
+{
+    GLfloat yellow_diffuse[] = { 0.7, 0.7, 0.0, 1.0 };
+    GLfloat yellow_specular[] = { 1.0, 1.0, 1.0, 1.0 };
+
+    GLfloat blue_diffuse[] = { 0.1, 0.1, 0.7, 1.0 };
+    GLfloat blue_specular[] = { 0.1, 1.0, 1.0, 1.0 };
+
+    GLfloat position_one[] = { 1.0, 1.0, 1.0, 0.0 };
+
+    glNewList(YELLOWMAT, GL_COMPILE);
+    glMaterialfv(GL_FRONT, GL_DIFFUSE, yellow_diffuse);
+    glMaterialfv(GL_FRONT, GL_SPECULAR, yellow_specular);
+    glMaterialf(GL_FRONT, GL_SHININESS, 64.0);
+    glEndList();
+
+    glNewList(BLUEMAT, GL_COMPILE);
+    glMaterialfv(GL_FRONT, GL_DIFFUSE, blue_diffuse);
+    glMaterialfv(GL_FRONT, GL_SPECULAR, blue_specular);
+    glMaterialf(GL_FRONT, GL_SHININESS, 45.0);
+    glEndList();
+
+    glLightfv(GL_LIGHT0, GL_POSITION, position_one);
+
+    glEnable(GL_LIGHT0);
+    glEnable(GL_LIGHTING);
+    glDepthFunc(GL_LESS);
+    glEnable(GL_DEPTH_TEST);
+
+    glClearStencil(0x0);
+    glEnable(GL_STENCIL_TEST);
+
+}
+
+/*  Draw a sphere in a diamond-shaped section in the
+ *  middle of a window with 2 tori.
+ */
+void display(void)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+/* draw blue sphere where the stencil is 1 */
+    glStencilFunc (GL_EQUAL, 0x1, 0x1);
+    glCallList (BLUEMAT);
+    glutSolidSphere (0.5, 15, 15);
+
+/* draw the tori where the stencil is not 1 */
+    glStencilFunc (GL_NOTEQUAL, 0x1, 0x1);
+    glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
+    glPushMatrix();
+	glRotatef (45.0, 0.0, 0.0, 1.0);
+	glRotatef (45.0, 0.0, 1.0, 0.0);
+	glCallList (YELLOWMAT);
+	glutSolidTorus (0.275, 0.85, 15, 15);
+	glPushMatrix();
+	    glRotatef (90.0, 1.0, 0.0, 0.0);
+	    glutSolidTorus (0.275, 0.85, 15, 15);
+	glPopMatrix();
+    glPopMatrix();
+
+    glFlush();
+}
+
+/*  Whenever the window is reshaped, redefine the 
+ *  coordinate system and redraw the stencil area.
+ */
+void myReshape(int w, int h)
+{
+    glViewport(0, 0, w, h);
+
+    glClear(GL_STENCIL_BUFFER_BIT);
+/* create a diamond shaped stencil area */
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-3.0, 3.0, -3.0, 3.0, -1.0, 1.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    glStencilFunc (GL_ALWAYS, 0x1, 0x1);
+    glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE);
+    glBegin(GL_QUADS);
+	glVertex3f (-1.0, 0.0, 0.0);
+	glVertex3f (0.0, 1.0, 0.0);
+	glVertex3f (1.0, 0.0, 0.0);
+	glVertex3f (0.0, -1.0, 0.0);
+    glEnd();
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(45.0, (GLfloat) w/(GLfloat) h, 3.0, 7.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0.0, 0.0, -5.0);
+}
+
+/*  Main Loop
+ *  Open window with initial window size, title bar, 
+ *  RGBA display mode, and handle input events.
+ */
+int main(int argc, char** argv)
+{
+    glutInit(&argc, argv);
+    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL);
+    glutInitWindowSize (400, 400);
+    glutCreateWindow (argv[0]);
+    myinit ();
+    glutReshapeFunc (myReshape);
+    glutDisplayFunc(display);
+    glutMainLoop();
+    return 0;             /* ANSI C requires main to return int. */
+}