1
2/* Copyright (c) Mark J. Kilgard, 1994. */
3
4/*
5 * (c) Copyright 1993, Silicon Graphics, Inc.
6 * ALL RIGHTS RESERVED
7 * Permission to use, copy, modify, and distribute this software for
8 * any purpose and without fee is hereby granted, provided that the above
9 * copyright notice appear in all copies and that both the copyright notice
10 * and this permission notice appear in supporting documentation, and that
11 * the name of Silicon Graphics, Inc. not be used in advertising
12 * or publicity pertaining to distribution of the software without specific,
13 * written prior permission.
14 *
15 * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
16 * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
17 * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
18 * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
19 * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
20 * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
21 * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
22 * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
23 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
24 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
25 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
26 * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
27 *
28 * US Government Users Restricted Rights
29 * Use, duplication, or disclosure by the Government is subject to
30 * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
31 * (c)(1)(ii) of the Rights in Technical Data and Computer Software
32 * clause at DFARS 252.227-7013 and/or in similar or successor
33 * clauses in the FAR or the DOD or NASA FAR Supplement.
34 * Unpublished-- rights reserved under the copyright laws of the
35 * United States.  Contractor/manufacturer is Silicon Graphics,
36 * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
37 *
38 * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
39 */
40/*
41 *  scene.c
42 *  This program demonstrates the use of the GL lighting model.
43 *  Objects are drawn using a grey material characteristic.
44 *  A single light source illuminates the objects.
45 */
46#include <stdlib.h>
47#include "glut_wrap.h"
48
49/*  Initialize material property and light source.
50 */
51static void myinit (void)
52{
53    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
54    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
55    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
56/*	light_position is NOT default value	*/
57    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
58
59    glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient);
60    glLightfv (GL_LIGHT0, GL_DIFFUSE, light_diffuse);
61    glLightfv (GL_LIGHT0, GL_SPECULAR, light_specular);
62    glLightfv (GL_LIGHT0, GL_POSITION, light_position);
63
64    glEnable (GL_LIGHTING);
65    glEnable (GL_LIGHT0);
66    glDepthFunc(GL_LESS);
67    glEnable(GL_DEPTH_TEST);
68}
69
70static void display (void)
71{
72    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
73
74    glPushMatrix ();
75    glRotatef (20.0, 1.0, 0.0, 0.0);
76
77    glPushMatrix ();
78    glTranslatef (-0.75, 0.5, 0.0);
79    glRotatef (90.0, 1.0, 0.0, 0.0);
80    glutSolidTorus (0.275, 0.85, 15, 15);
81    glPopMatrix ();
82
83    glPushMatrix ();
84    glTranslatef (-0.75, -0.5, 0.0);
85    glRotatef (270.0, 1.0, 0.0, 0.0);
86    glutSolidCone (1.0, 2.0, 15, 15);
87    glPopMatrix ();
88
89    glPushMatrix ();
90    glTranslatef (0.75, 0.0, -1.0);
91    glutSolidSphere (1.0, 15, 15);
92    glPopMatrix ();
93
94    glPopMatrix ();
95    glFlush ();
96}
97
98static void myReshape(int w, int h)
99{
100    glViewport (0, 0, w, h);
101    glMatrixMode (GL_PROJECTION);
102    glLoadIdentity ();
103    if (w <= h)
104	glOrtho (-2.5, 2.5, -2.5*(GLfloat)h/(GLfloat)w,
105	    2.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
106    else
107	glOrtho (-2.5*(GLfloat)w/(GLfloat)h,
108	    2.5*(GLfloat)w/(GLfloat)h, -2.5, 2.5, -10.0, 10.0);
109    glMatrixMode (GL_MODELVIEW);
110}
111
112static void
113key(unsigned char k, int x, int y)
114{
115  switch (k) {
116  case 27:  /* Escape */
117    exit(0);
118    break;
119  default:
120    return;
121  }
122  glutPostRedisplay();
123}
124
125/*  Main Loop
126 *  Open window with initial window size, title bar,
127 *  RGBA display mode, and handle input events.
128 */
129int main(int argc, char** argv)
130{
131    glutInit(&argc, argv);
132    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
133    glutInitWindowSize (500, 500);
134    glutCreateWindow (argv[0]);
135    myinit ();
136    glutReshapeFunc (myReshape);
137    glutDisplayFunc(display);
138    glutKeyboardFunc(key);
139    glutMainLoop();
140    return 0;             /* ANSI C requires main to return int. */
141}
142