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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 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- * Unpublished-- rights reserved under the copyright laws of the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.
- */
-
-/*
- * torus.c
- * This program demonstrates the creation of a display list.
- */
-
-#include <GL/glut.h>
-#include <stdio.h>
-#include <math.h>
-#include <stdlib.h>
-
-/* Some <math.h> files do not define M_PI... */
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
-
-GLuint theTorus;
-
-/* Draw a torus */
-static void torus(int numc, int numt)
-{
- int i, j, k;
- double s, t, x, y, z, twopi;
-
- twopi = 2 * (double)M_PI;
- for (i = 0; i < numc; i++) {
- glBegin(GL_QUAD_STRIP);
- for (j = 0; j <= numt; j++) {
- for (k = 1; k >= 0; k--) {
- s = (i + k) % numc + 0.5;
- t = j % numt;
-
- x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
- y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);
- z = .1 * sin(s * twopi / numc);
- glVertex3f(x, y, z);
- }
- }
- glEnd();
- }
-}
-
-/* Create display list with Torus and initialize state */
-static void init(void)
-{
- theTorus = glGenLists (1);
- glNewList(theTorus, GL_COMPILE);
- torus(8, 25);
- glEndList();
-
- glShadeModel(GL_FLAT);
- glClearColor(0.0, 0.0, 0.0, 0.0);
-}
-
-/* Clear window and draw torus */
-static void display(void)
-{
- glClear(GL_COLOR_BUFFER_BIT);
- glColor3f (1.0, 1.0, 1.0);
- glCallList(theTorus);
- glFlush();
-}
-
-/* Handle window resize */
-static void reshape(int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
-}
-
-/* Rotate about x-axis when "x" typed; rotate about y-axis
- when "y" typed; "i" returns torus to original view */
-/* ARGSUSED1 */
-static void keyboard(unsigned char key, int x, int y)
-{
- switch (key) {
- case 'x':
- case 'X':
- glRotatef(30.,1.0,0.0,0.0);
- glutPostRedisplay();
- break;
- case 'y':
- case 'Y':
- glRotatef(30.,0.0,1.0,0.0);
- glutPostRedisplay();
- break;
- case 'i':
- case 'I':
- glLoadIdentity();
- gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
- glutPostRedisplay();
- break;
- case 27:
- exit(0);
- break;
- }
-}
-
-int main(int argc, char **argv)
-{
- glutInitWindowSize(200, 200);
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
- glutCreateWindow(argv[0]);
- init();
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutDisplayFunc(display);
- glutMainLoop();
- return 0;
-}