progs/redbook/colormat.c

   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  31  * Unpublished-- rights reserved under the copyright laws of the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  *  colormat.c
  40  *  After initialization, the program will be in
  41  *  ColorMaterial mode.  Interaction:  pressing the
  42  *  mouse buttons will change the diffuse reflection values.
  43  */
  44 #include <GL/glut.h>
  45 #include <stdlib.h>
  46
  47 GLfloat diffuseMaterial[4] = { 0.5, 0.5, 0.5, 1.0 };
  48
  49 /*  Initialize material property, light source, lighting model,
  50  *  and depth buffer.
  51  */
  52 static void init(void)
  53 {
  54    GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  55    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
  56
  57    glClearColor (0.0, 0.0, 0.0, 0.0);
  58    glShadeModel (GL_SMOOTH);
  59    glEnable(GL_DEPTH_TEST);
  60    glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseMaterial);
  61    glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  62    glMaterialf(GL_FRONT, GL_SHININESS, 25.0);
  63    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  64    glEnable(GL_LIGHTING);
  65    glEnable(GL_LIGHT0);
  66
  67    glColorMaterial(GL_FRONT, GL_DIFFUSE);
  68    glEnable(GL_COLOR_MATERIAL);
  69 }
  70
  71 static void display(void)
  72 {
  73    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  74    glutSolidSphere(1.0, 20, 16);
  75    glFlush ();
  76 }
  77
  78 static void reshape (int w, int h)
  79 {
  80    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
  81    glMatrixMode (GL_PROJECTION);
  82    glLoadIdentity();
  83    if (w <= h)
  84       glOrtho (-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,
  85          1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
  86    else
  87       glOrtho (-1.5*(GLfloat)w/(GLfloat)h,
  88          1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0);
  89    glMatrixMode(GL_MODELVIEW);
  90    glLoadIdentity();
  91 }
  92
  93 /* ARGSUSED2 */
  94 static void mouse(int button, int state, int x, int y)
  95 {
  96    switch (button) {
  97       case GLUT_LEFT_BUTTON:
  98          if (state == GLUT_DOWN) {
  99             diffuseMaterial[0] += 0.1;
 100             if (diffuseMaterial[0] > 1.0)
 101                diffuseMaterial[0] = 0.0;
 102             glColor4fv(diffuseMaterial);
 103             glutPostRedisplay();
 104          }
 105          break;
 106       case GLUT_MIDDLE_BUTTON:
 107          if (state == GLUT_DOWN) {
 108             diffuseMaterial[1] += 0.1;
 109             if (diffuseMaterial[1] > 1.0)
 110                diffuseMaterial[1] = 0.0;
 111             glColor4fv(diffuseMaterial);
 112             glutPostRedisplay();
 113          }
 114          break;
 115       case GLUT_RIGHT_BUTTON:
 116          if (state == GLUT_DOWN) {
 117             diffuseMaterial[2] += 0.1;
 118             if (diffuseMaterial[2] > 1.0)
 119                diffuseMaterial[2] = 0.0;
 120             glColor4fv(diffuseMaterial);
 121             glutPostRedisplay();
 122          }
 123          break;
 124       default:
 125          break;
 126    }
 127 }
 128
 129 /* ARGSUSED1 */
 130 static void keyboard(unsigned char key, int x, int y)
 131 {
 132    switch (key) {
 133       case 27:
 134          exit(0);
 135          break;
 136    }
 137 }
 138
 139 int main(int argc, char** argv)
 140 {
 141    glutInit(&argc, argv);
 142    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
 143    glutInitWindowSize (500, 500);
 144    glutInitWindowPosition (100, 100);
 145    glutCreateWindow (argv[0]);
 146    init ();
 147    glutDisplayFunc(display);
 148    glutReshapeFunc(reshape);
 149    glutMouseFunc(mouse);
 150    glutKeyboardFunc(keyboard);
 151    glutMainLoop();
 152    return 0;
 153 }