progs/redbook/material.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  34  * Unpublished-- rights reserved under the copyright laws of the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  * material.c
  42  * This program demonstrates the use of the GL lighting model.
  43  * Several objects are drawn using different material characteristics.
  44  * A single light source illuminates the objects.
  45  */
  46 #include <stdlib.h>
  47 #include <GL/glut.h>
  48
  49 /*  Initialize z-buffer, projection matrix, light source,
  50  *  and lighting model.  Do not specify a material property here.
  51  */
  52 static void myinit(void)
  53 {
  54     GLfloat ambient[] = { 0.0, 0.0, 0.0, 1.0 };
  55     GLfloat diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
  56     GLfloat position[] = { 0.0, 3.0, 2.0, 0.0 };
  57     GLfloat lmodel_ambient[] = { 0.4, 0.4, 0.4, 1.0 };
  58     GLfloat local_view[] = { 0.0 };
  59
  60     glEnable(GL_DEPTH_TEST);
  61     glDepthFunc(GL_LESS);
  62
  63     glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
  64     glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
  65     glLightfv(GL_LIGHT0, GL_POSITION, position);
  66     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
  67     glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, local_view);
  68
  69     glEnable(GL_LIGHTING);
  70     glEnable(GL_LIGHT0);
  71
  72     glClearColor(0.0, 0.1, 0.1, 0.0);
  73 }
  74
  75 /*  Draw twelve spheres in 3 rows with 4 columns.
  76  *  The spheres in the first row have materials with no ambient reflection.
  77  *  The second row has materials with significant ambient reflection.
  78  *  The third row has materials with colored ambient reflection.
  79  *
  80  *  The first column has materials with blue, diffuse reflection only.
  81  *  The second column has blue diffuse reflection, as well as specular
  82  *  reflection with a low shininess exponent.
  83  *  The third column has blue diffuse reflection, as well as specular
  84  *  reflection with a high shininess exponent (a more concentrated highlight).
  85  *  The fourth column has materials which also include an emissive component.
  86  *
  87  *  glTranslatef() is used to move spheres to their appropriate locations.
  88  */
  89
  90 static void display(void)
  91 {
  92     GLfloat no_mat[] = { 0.0, 0.0, 0.0, 1.0 };
  93     GLfloat mat_ambient[] = { 0.7, 0.7, 0.7, 1.0 };
  94     GLfloat mat_ambient_color[] = { 0.8, 0.8, 0.2, 1.0 };
  95     GLfloat mat_diffuse[] = { 0.1, 0.5, 0.8, 1.0 };
  96     GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  97     GLfloat no_shininess[] = { 0.0 };
  98     GLfloat low_shininess[] = { 5.0 };
  99     GLfloat high_shininess[] = { 100.0 };
 100     GLfloat mat_emission[] = {0.3, 0.2, 0.2, 0.0};
 101
 102     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 103
 104 /*  draw sphere in first row, first column
 105  *  diffuse reflection only; no ambient or specular
 106  */
 107     glPushMatrix();
 108     glTranslatef (-3.75, 3.0, 0.0);
 109     glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
 110     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 111     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 112     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 113     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 114     glutSolidSphere(1.0, 16, 16);
 115     glPopMatrix();
 116
 117 /*  draw sphere in first row, second column
 118  *  diffuse and specular reflection; low shininess; no ambient
 119  */
 120     glPushMatrix();
 121     glTranslatef (-1.25, 3.0, 0.0);
 122     glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
 123     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 124     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 125     glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess);
 126     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 127     glutSolidSphere(1.0, 16, 16);
 128     glPopMatrix();
 129
 130 /*  draw sphere in first row, third column
 131  *  diffuse and specular reflection; high shininess; no ambient
 132  */
 133     glPushMatrix();
 134     glTranslatef (1.25, 3.0, 0.0);
 135     glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
 136     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 137     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 138     glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
 139     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 140     glutSolidSphere(1.0, 16, 16);
 141     glPopMatrix();
 142
 143 /*  draw sphere in first row, fourth column
 144  *  diffuse reflection; emission; no ambient or specular reflection
 145  */
 146     glPushMatrix();
 147     glTranslatef (3.75, 3.0, 0.0);
 148     glMaterialfv(GL_FRONT, GL_AMBIENT, no_mat);
 149     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 150     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 151     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 152     glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission);
 153     glutSolidSphere(1.0, 16, 16);
 154     glPopMatrix();
 155
 156 /*  draw sphere in second row, first column
 157  *  ambient and diffuse reflection; no specular
 158  */
 159     glPushMatrix();
 160     glTranslatef (-3.75, 0.0, 0.0);
 161     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
 162     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 163     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 164     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 165     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 166     glutSolidSphere(1.0, 16, 16);
 167     glPopMatrix();
 168
 169 /*  draw sphere in second row, second column
 170  *  ambient, diffuse and specular reflection; low shininess
 171  */
 172     glPushMatrix();
 173     glTranslatef (-1.25, 0.0, 0.0);
 174     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
 175     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 176     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 177     glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess);
 178     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 179     glutSolidSphere(1.0, 16, 16);
 180     glPopMatrix();
 181
 182 /*  draw sphere in second row, third column
 183  *  ambient, diffuse and specular reflection; high shininess
 184  */
 185     glPushMatrix();
 186     glTranslatef (1.25, 0.0, 0.0);
 187     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
 188     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 189     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 190     glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
 191     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 192     glutSolidSphere(1.0, 16, 16);
 193     glPopMatrix();
 194
 195 /*  draw sphere in second row, fourth column
 196  *  ambient and diffuse reflection; emission; no specular
 197  */
 198     glPushMatrix();
 199     glTranslatef (3.75, 0.0, 0.0);
 200     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
 201     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 202     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 203     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 204     glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission);
 205     glutSolidSphere(1.0, 16, 16);
 206     glPopMatrix();
 207
 208 /*  draw sphere in third row, first column
 209  *  colored ambient and diffuse reflection; no specular
 210  */
 211     glPushMatrix();
 212     glTranslatef (-3.75, -3.0, 0.0);
 213     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color);
 214     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 215     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 216     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 217     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 218     glutSolidSphere(1.0, 16, 16);
 219     glPopMatrix();
 220
 221 /*  draw sphere in third row, second column
 222  *  colored ambient, diffuse and specular reflection; low shininess
 223  */
 224     glPushMatrix();
 225     glTranslatef (-1.25, -3.0, 0.0);
 226     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color);
 227     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 228     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 229     glMaterialfv(GL_FRONT, GL_SHININESS, low_shininess);
 230     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 231     glutSolidSphere(1.0, 16, 16);
 232     glPopMatrix();
 233
 234 /*  draw sphere in third row, third column
 235  *  colored ambient, diffuse and specular reflection; high shininess
 236  */
 237     glPushMatrix();
 238     glTranslatef (1.25, -3.0, 0.0);
 239     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color);
 240     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 241     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
 242     glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
 243     glMaterialfv(GL_FRONT, GL_EMISSION, no_mat);
 244     glutSolidSphere(1.0, 16, 16);
 245     glPopMatrix();
 246
 247 /*  draw sphere in third row, fourth column
 248  *  colored ambient and diffuse reflection; emission; no specular
 249  */
 250     glPushMatrix();
 251     glTranslatef (3.75, -3.0, 0.0);
 252     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient_color);
 253     glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
 254     glMaterialfv(GL_FRONT, GL_SPECULAR, no_mat);
 255     glMaterialfv(GL_FRONT, GL_SHININESS, no_shininess);
 256     glMaterialfv(GL_FRONT, GL_EMISSION, mat_emission);
 257     glutSolidSphere(1.0, 16, 16);
 258     glPopMatrix();
 259
 260     glFlush();
 261 }
 262
 263 static void myReshape(int w, int h)
 264 {
 265     glViewport(0, 0, w, h);
 266     glMatrixMode(GL_PROJECTION);
 267     glLoadIdentity();
 268     if (w <= (h * 2))
 269         glOrtho (-6.0, 6.0, -3.0*((GLfloat)h*2)/(GLfloat)w,
 270             3.0*((GLfloat)h*2)/(GLfloat)w, -10.0, 10.0);
 271     else
 272         glOrtho (-6.0*(GLfloat)w/((GLfloat)h*2),
 273             6.0*(GLfloat)w/((GLfloat)h*2), -3.0, 3.0, -10.0, 10.0);
 274     glMatrixMode(GL_MODELVIEW);
 275 }
 276
 277 static void
 278 key(unsigned char k, int x, int y)
 279 {
 280   switch (k) {
 281   case 27:  /* Escape */
 282     exit(0);
 283     break;
 284   default:
 285     return;
 286   }
 287   glutPostRedisplay();
 288 }
 289
 290 /*  Main Loop
 291  *  Open window with initial window size, title bar,
 292  *  RGBA display mode, and handle input events.
 293  */
 294 int main(int argc, char** argv)
 295 {
 296     glutInit(&argc, argv);
 297     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 298     glutInitWindowSize (600, 450);
 299     glutCreateWindow(argv[0]);
 300     myinit();
 301     glutReshapeFunc(myReshape);
 302     glutDisplayFunc(display);
 303     glutKeyboardFunc(key);
 304     glutMainLoop();
 305     return 0;             /* ANSI C requires main to return int. */
 306 }