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34 * Unpublished-- rights reserved under the copyright laws of the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 *  scenebamb.c
42 *  This program demonstrates use of a blue ambient light
43 *  source.
44 */
45#include <stdlib.h>
46#include "glut_wrap.h"
47
48/*  Initialize light source and lighting.
49 */
50static void myinit(void)
51{
52    GLfloat light_ambient[] = { 0.0, 0.0, 1.0, 1.0 };
53    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
54    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
55/*	light_position is NOT default value	*/
56    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
57
58    glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
59    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
60    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
61    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
62
63    glEnable(GL_LIGHTING);
64    glEnable(GL_LIGHT0);
65    glDepthFunc(GL_LESS);
66    glEnable(GL_DEPTH_TEST);
67}
68
69static void display(void)
70{
71    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
72
73    glPushMatrix ();
74    glRotatef (20.0, 1.0, 0.0, 0.0);
75
76    glPushMatrix ();
77    glTranslatef (-0.75, 0.5, 0.0);
78    glRotatef (90.0, 1.0, 0.0, 0.0);
79    glutSolidTorus (0.275, 0.85, 15, 15);
80    glPopMatrix ();
81
82    glPushMatrix ();
83    glTranslatef (-0.75, -0.5, 0.0);
84    glRotatef (270.0, 1.0, 0.0, 0.0);
85    glutSolidCone (1.0, 2.0, 15, 15);
86    glPopMatrix ();
87
88    glPushMatrix ();
89    glTranslatef (0.75, 0.0, -1.0);
90    glutSolidSphere (1.0, 15, 15);
91    glPopMatrix ();
92
93    glPopMatrix ();
94    glFlush();
95}
96
97static void myReshape(int w, int h)
98{
99    glViewport(0, 0, w, h);
100    glMatrixMode(GL_PROJECTION);
101    glLoadIdentity();
102    if (w <= h)
103	glOrtho (-2.5, 2.5, -2.5*(GLfloat)h/(GLfloat)w,
104	    2.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
105    else
106	glOrtho (-2.5*(GLfloat)w/(GLfloat)h,
107	    2.5*(GLfloat)w/(GLfloat)h, -2.5, 2.5, -10.0, 10.0);
108    glMatrixMode(GL_MODELVIEW);
109}
110
111static void
112key(unsigned char k, int x, int y)
113{
114  switch (k) {
115  case 27:  /* Escape */
116    exit(0);
117    break;
118  default:
119    return;
120  }
121  glutPostRedisplay();
122}
123
124/*  Main Loop
125 *  Open window with initial window size, title bar,
126 *  RGBA display mode, and handle input events.
127 */
128int main(int argc, char** argv)
129{
130    glutInit(&argc, argv);
131    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
132    glutInitWindowSize (500, 500);
133    glutCreateWindow (argv[0]);
134    myinit();
135    glutReshapeFunc (myReshape);
136    glutDisplayFunc(display);
137    glutKeyboardFunc(key);
138    glutMainLoop();
139    return 0;             /* ANSI C requires main to return int. */
140}
141