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diff --git a/progs/redbook/surface.c b/progs/redbook/surface.c
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-/* aux2glut conversion Copyright (c) Mark J. Kilgard, 1994, 1995 */
-
-/**
- * (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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-/**
- * surface.c
- * This program draws a NURBS surface in the shape of a
- * symmetrical hill.
- */
-#include <stdlib.h>
-#include <GL/glut.h>
-
-GLfloat ctlpoints[4][4][3];
-int showPoints = 0;
-
-GLUnurbsObj *theNurb;
-
-/*
- * Initializes the control points of the surface to a small hill.
- * The control points range from -3 to +3 in x, y, and z
- */
-static void init_surface(void)
-{
- int u, v;
- for (u = 0; u < 4; u++) {
- for (v = 0; v < 4; v++) {
- ctlpoints[u][v][0] = 2.0*((GLfloat)u - 1.5);
- ctlpoints[u][v][1] = 2.0*((GLfloat)v - 1.5);
-
- if ( (u == 1 || u == 2) && (v == 1 || v == 2))
- ctlpoints[u][v][2] = 7.0;
- else
- ctlpoints[u][v][2] = -3.0;
- }
- }
-}
-
-/* Initialize material property and depth buffer.
- */
-static void myinit(void)
-{
- GLfloat mat_diffuse[] = { 0.7, 0.7, 0.7, 1.0 };
- GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
- GLfloat mat_shininess[] = { 100.0 };
-
- glClearColor (0.0, 0.0, 0.0, 1.0);
- glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
- glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
- glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
-
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- glDepthFunc(GL_LESS);
- glEnable(GL_DEPTH_TEST);
- glEnable(GL_AUTO_NORMAL);
- glEnable(GL_NORMALIZE);
-
- init_surface();
-
- theNurb = gluNewNurbsRenderer();
- gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
- gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
-
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef (0.0, 0.0, -5.0);
-}
-
-static void display(void)
-{
- GLfloat knots[8] = {0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0};
- int i, j;
-
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
- glPushMatrix();
- glRotatef(330.0, 1.,0.,0.);
- glScalef (0.25, 0.25, 0.25);
-
- gluBeginSurface(theNurb);
- gluNurbsSurface(theNurb,
- 8, knots,
- 8, knots,
- 4 * 3,
- 3,
- &ctlpoints[0][0][0],
- 4, 4,
- GL_MAP2_VERTEX_3);
- gluEndSurface(theNurb);
-
- if(showPoints) {
- glPointSize(5.0);
- glDisable(GL_LIGHTING);
- glColor3f(1.0, 1.0, 0.0);
- glBegin(GL_POINTS);
- for(i=0;i<4;i++) {
- for(j=0;j<4;j++) {
- glVertex3f(ctlpoints[i][j][0], ctlpoints[i][j][1], ctlpoints[i][j][2]);
- }
- }
- glEnd();
- glEnable(GL_LIGHTING);
- }
-
- glPopMatrix();
- glutSwapBuffers();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, w, h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective (45.0, (GLdouble)w/(GLdouble)h, 3.0, 8.0);
-
- glMatrixMode(GL_MODELVIEW);
-}
-
-static void
-menu(int value)
-{
- switch (value) {
- case 0:
- case 1:
- showPoints = value;
- break;
- case 2:
- gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
- break;
- case 3:
- gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_OUTLINE_POLYGON);
- break;
- }
- glutPostRedisplay();
-}
-
-int down = 0, lastx;
-
-/* ARGSUSED1 */
-static void
-motion(int x, int y)
-{
- if (down) {
- glRotatef(lastx - x, 0, 1, 0);
- lastx = x;
- glutPostRedisplay();
- }
-}
-
-/* ARGSUSED3 */
-static void
-mouse(int button, int state, int x, int y)
-{
- if (button == GLUT_LEFT_BUTTON) {
- if (state == GLUT_DOWN) {
- lastx = x;
- down = 1;
- } else {
- down = 0;
- }
- }
-}
-
-static void
-key(unsigned char k, int x, int y)
-{
- switch (k) {
- case 27: /* Escape */
- exit(0);
- break;
- default:
- return;
- }
- glutPostRedisplay();
-}
-
-/* Main Loop */
-int
-main(int argc, char** argv)
-{
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);
- glutCreateWindow(argv[0]);
- myinit();
- glutReshapeFunc(reshape);
- glutDisplayFunc(display);
- glutCreateMenu(menu);
- glutAddMenuEntry("Show control points", 1);
- glutAddMenuEntry("Hide control points", 0);
- glutAddMenuEntry("Solid", 2);
- glutAddMenuEntry("Wireframe", 3);
- glutAttachMenu(GLUT_RIGHT_BUTTON);
- glutMouseFunc(mouse);
- glutMotionFunc(motion);
- glutKeyboardFunc(key);
- glutMainLoop();
- return 0; /* ANSI C requires main to return int. */
-}
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