progs/redbook/sccolorlight.c

   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  34  * Unpublished-- rights reserved under the copyright laws of the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  *  sccolorlight.c
  42  *  This program demonstrates the use of a colored
  43  *  (magenta, in this example) light source.  Objects
  44  *  are drawn using a grey material characteristic.
  45  *  A single light source illuminates the objects.
  46  */
  47 #include <stdlib.h>
  48 #include <GL/glut.h>
  49
  50 /*  Initialize material property and light source.
  51  */
  52 static void myinit(void)
  53 {
  54     GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
  55     GLfloat light_diffuse[] = { 1.0, 0.0, 1.0, 1.0 };
  56     GLfloat light_specular[] = { 1.0, 0.0, 1.0, 1.0 };
  57 /*      light_position is NOT default value     */
  58     GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
  59
  60     glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
  61     glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
  62     glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
  63     glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  64
  65     glEnable(GL_LIGHTING);
  66     glEnable(GL_LIGHT0);
  67     glDepthFunc(GL_LESS);
  68     glEnable(GL_DEPTH_TEST);
  69 }
  70
  71 static void display(void)
  72 {
  73     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  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, 20, 20);
  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, 20, 20);
  87     glPopMatrix ();
  88
  89     glPushMatrix ();
  90     glTranslatef (0.75, 0.0, -1.0);
  91     glutSolidSphere (1.0, 20, 20);
  92     glPopMatrix ();
  93
  94     glPopMatrix ();
  95     glFlush();
  96 }
  97
  98 static 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
 112 static void
 113 key(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  */
 129 int 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 }