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| 31 | * Unpublished-- rights reserved under the copyright laws of the |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 | * clip.c |
| 40 | * This program demonstrates arbitrary clipping planes. |
| 41 | */ |
| 42 | #include <GL/glut.h> |
| 43 | #include <stdlib.h> |
| 44 | |
| 45 | void init(void) |
| 46 | { |
| 47 | glClearColor (0.0, 0.0, 0.0, 0.0); |
| 48 | glShadeModel (GL_FLAT); |
| 49 | } |
| 50 | |
| 51 | void display(void) |
| 52 | { |
| 53 | GLdouble eqn[4] = {0.0, 1.0, 0.0, 0.0}; |
| 54 | GLdouble eqn2[4] = {1.0, 0.0, 0.0, 0.0}; |
| 55 | |
| 56 | glClear(GL_COLOR_BUFFER_BIT); |
| 57 | |
| 58 | glColor3f (1.0, 1.0, 1.0); |
| 59 | glPushMatrix(); |
| 60 | glTranslatef (0.0, 0.0, -5.0); |
| 61 | |
| 62 | /* clip lower half -- y < 0 */ |
| 63 | glClipPlane (GL_CLIP_PLANE0, eqn); |
| 64 | glEnable (GL_CLIP_PLANE0); |
| 65 | /* clip left half -- x < 0 */ |
| 66 | glClipPlane (GL_CLIP_PLANE1, eqn2); |
| 67 | glEnable (GL_CLIP_PLANE1); |
| 68 | |
| 69 | glRotatef (90.0, 1.0, 0.0, 0.0); |
| 70 | glutWireSphere(1.0, 20, 16); |
| 71 | glPopMatrix(); |
| 72 | |
| 73 | glFlush (); |
| 74 | } |
| 75 | |
| 76 | void reshape (int w, int h) |
| 77 | { |
| 78 | glViewport (0, 0, (GLsizei) w, (GLsizei) h); |
| 79 | glMatrixMode (GL_PROJECTION); |
| 80 | glLoadIdentity (); |
| 81 | gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0); |
| 82 | glMatrixMode (GL_MODELVIEW); |
| 83 | } |
| 84 | |
| 85 | /* ARGSUSED1 */ |
| 86 | void keyboard(unsigned char key, int x, int y) |
| 87 | { |
| 88 | switch (key) { |
| 89 | case 27: |
| 90 | exit(0); |
| 91 | break; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | int main(int argc, char** argv) |
| 96 | { |
| 97 | glutInit(&argc, argv); |
| 98 | glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); |
| 99 | glutInitWindowSize (500, 500); |
| 100 | glutInitWindowPosition (100, 100); |
| 101 | glutCreateWindow (argv[0]); |
| 102 | init (); |
| 103 | glutDisplayFunc(display); |
| 104 | glutReshapeFunc(reshape); |
| 105 | glutKeyboardFunc(keyboard); |
| 106 | glutMainLoop(); |
| 107 | return 0; |
| 108 | } |