| jtg | afb833d | 1999-08-19 00:55:39 +0000 | [diff] [blame] | 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| 31 | * Unpublished-- rights reserved under the copyright laws of the |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 <GL/glut.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 | |
| 53 | GLuint theTorus; |
| 54 | |
| 55 | /* Draw a torus */ |
| 56 | static 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 */ |
| 80 | static 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 */ |
| 92 | 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 */ |
| 101 | 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 */ |
| 115 | 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 | |
| 140 | int 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 | } |