1/*
2 * Copyright (c) 1993-1997, Silicon Graphics, Inc.
3 * ALL RIGHTS RESERVED
4 * Permission to use, copy, modify, and distribute this software for
5 * any purpose and without fee is hereby granted, provided that the above
6 * copyright notice appear in all copies and that both the copyright notice
7 * and this permission notice appear in supporting documentation, and that
8 * the name of Silicon Graphics, Inc. not be used in advertising
9 * or publicity pertaining to distribution of the software without specific,
10 * written prior permission.
11 *
12 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
13 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
14 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
15 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
16 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
17 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
18 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
19 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
20 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
21 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
23 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
24 *
25 * US Government Users Restricted Rights
26 * Use, duplication, or disclosure by the Government is subject to
27 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
28 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
29 * clause at DFARS 252.227-7013 and/or in similar or successor
30 * clauses in the FAR or the DOD or NASA FAR Supplement.
31 * Unpublished-- rights reserved under the copyright laws of the
32 * United States.  Contractor/manufacturer is Silicon Graphics,
33 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
34 *
35 * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
36 */
37
38/*
39 *  torus.c
40 *  This program demonstrates the creation of a display list.
41 */
42
43#include "glut_wrap.h"
44#include <stdio.h>
45#include <math.h>
46#include <stdlib.h>
47
48/* Some <math.h> files do not define M_PI... */
49#ifndef M_PI
50#define M_PI 3.14159265358979323846
51#endif
52
53GLuint theTorus;
54
55/* Draw a torus */
56static void torus(int numc, int numt)
57{
58   int i, j, k;
59   double s, t, x, y, z, twopi;
60
61   twopi = 2 * (double)M_PI;
62   for (i = 0; i < numc; i++) {
63      glBegin(GL_QUAD_STRIP);
64      for (j = 0; j <= numt; j++) {
65         for (k = 1; k >= 0; k--) {
66            s = (i + k) % numc + 0.5;
67            t = j % numt;
68
69            x = (1+.1*cos(s*twopi/numc))*cos(t*twopi/numt);
70            y = (1+.1*cos(s*twopi/numc))*sin(t*twopi/numt);
71            z = .1 * sin(s * twopi / numc);
72            glVertex3f(x, y, z);
73         }
74      }
75      glEnd();
76   }
77}
78
79/* Create display list with Torus and initialize state */
80static void init(void)
81{
82   theTorus = glGenLists (1);
83   glNewList(theTorus, GL_COMPILE);
84   torus(8, 25);
85   glEndList();
86
87   glShadeModel(GL_FLAT);
88   glClearColor(0.0, 0.0, 0.0, 0.0);
89}
90
91/* Clear window and draw torus */
92static void display(void)
93{
94   glClear(GL_COLOR_BUFFER_BIT);
95   glColor3f (1.0, 1.0, 1.0);
96   glCallList(theTorus);
97   glFlush();
98}
99
100/* Handle window resize */
101static void reshape(int w, int h)
102{
103   glViewport(0, 0, (GLsizei) w, (GLsizei) h);
104   glMatrixMode(GL_PROJECTION);
105   glLoadIdentity();
106   gluPerspective(30, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
107   glMatrixMode(GL_MODELVIEW);
108   glLoadIdentity();
109   gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
110}
111
112/* Rotate about x-axis when "x" typed; rotate about y-axis
113   when "y" typed; "i" returns torus to original view */
114/* ARGSUSED1 */
115static void keyboard(unsigned char key, int x, int y)
116{
117   switch (key) {
118   case 'x':
119   case 'X':
120      glRotatef(30.,1.0,0.0,0.0);
121      glutPostRedisplay();
122      break;
123   case 'y':
124   case 'Y':
125      glRotatef(30.,0.0,1.0,0.0);
126      glutPostRedisplay();
127      break;
128   case 'i':
129   case 'I':
130      glLoadIdentity();
131      gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
132      glutPostRedisplay();
133      break;
134   case 27:
135      exit(0);
136      break;
137   }
138}
139
140int main(int argc, char **argv)
141{
142   glutInitWindowSize(200, 200);
143   glutInit(&argc, argv);
144   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
145   glutCreateWindow(argv[0]);
146   init();
147   glutReshapeFunc(reshape);
148   glutKeyboardFunc(keyboard);
149   glutDisplayFunc(display);
150   glutMainLoop();
151   return 0;
152}
153