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31 * Unpublished-- rights reserved under the copyright laws of the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 *  light.c
40 *  This program demonstrates the use of the OpenGL lighting
41 *  model.  A sphere is drawn using a grey material characteristic.
42 *  A single light source illuminates the object.
43 */
44#include "glut_wrap.h"
45#include <stdlib.h>
46
47/*  Initialize material property, light source, lighting model,
48 *  and depth buffer.
49 */
50static void init(void)
51{
52   GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
53   GLfloat mat_shininess[] = { 50.0 };
54   GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
55
56   glClearColor (0.0, 0.0, 0.0, 0.0);
57   glShadeModel (GL_SMOOTH);
58
59   glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
60   glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
61   glLightfv(GL_LIGHT0, GL_POSITION, light_position);
62
63   glEnable(GL_LIGHTING);
64   glEnable(GL_LIGHT0);
65   glEnable(GL_DEPTH_TEST);
66}
67
68static void display(void)
69{
70   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
71   glutSolidSphere (1.0, 20, 16);
72   glFlush ();
73}
74
75static void reshape (int w, int h)
76{
77   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
78   glMatrixMode (GL_PROJECTION);
79   glLoadIdentity();
80   if (w <= h)
81      glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,
82         1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
83   else
84      glOrtho (-1.5*(GLfloat)w/(GLfloat)h,
85         1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0);
86   glMatrixMode(GL_MODELVIEW);
87   glLoadIdentity();
88}
89
90/* ARGSUSED1 */
91static void keyboard(unsigned char key, int x, int y)
92{
93   switch (key) {
94      case 27:
95         exit(0);
96         break;
97   }
98}
99
100int main(int argc, char** argv)
101{
102   glutInit(&argc, argv);
103   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
104   glutInitWindowSize (500, 500);
105   glutInitWindowPosition (100, 100);
106   glutCreateWindow (argv[0]);
107   init ();
108   glutDisplayFunc(display);
109   glutReshapeFunc(reshape);
110   glutKeyboardFunc(keyboard);
111   glutMainLoop();
112   return 0;
113}
114