progs/redbook/accanti.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  34  * Unpublished-- rights reserved under the copyright laws of the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 /*  accanti.c
  41  */
  42 #include <stdlib.h>
  43 #include <GL/glut.h>
  44 #include "jitter.h"
  45
  46 /*  Initialize lighting and other values.
  47  */
  48 static void myinit(void)
  49 {
  50     GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 };
  51     GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
  52     GLfloat light_position[] = { 0.0, 0.0, 10.0, 1.0 };
  53     GLfloat lm_ambient[] = { 0.2, 0.2, 0.2, 1.0 };
  54
  55     glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
  56     glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
  57     glMaterialf(GL_FRONT, GL_SHININESS, 50.0);
  58     glLightfv(GL_LIGHT0, GL_POSITION, light_position);
  59     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lm_ambient);
  60
  61     glEnable(GL_LIGHTING);
  62     glEnable(GL_LIGHT0);
  63     glDepthFunc(GL_LESS);
  64     glEnable(GL_DEPTH_TEST);
  65     glShadeModel (GL_FLAT);
  66
  67     glClearColor(0.0, 0.0, 0.0, 0.0);
  68     glClearAccum(0.0, 0.0, 0.0, 0.0);
  69 }
  70
  71 static void displayObjects(void)
  72 {
  73     GLfloat torus_diffuse[] = { 0.7, 0.7, 0.0, 1.0 };
  74     GLfloat cube_diffuse[] = { 0.0, 0.7, 0.7, 1.0 };
  75     GLfloat sphere_diffuse[] = { 0.7, 0.0, 0.7, 1.0 };
  76     GLfloat octa_diffuse[] = { 0.7, 0.4, 0.4, 1.0 };
  77
  78     glPushMatrix ();
  79     glRotatef (30.0, 1.0, 0.0, 0.0);
  80
  81     glPushMatrix ();
  82     glTranslatef (-0.80, 0.35, 0.0);
  83     glRotatef (100.0, 1.0, 0.0, 0.0);
  84     glMaterialfv(GL_FRONT, GL_DIFFUSE, torus_diffuse);
  85     glutSolidTorus (0.275, 0.85, 16, 16);
  86     glPopMatrix ();
  87
  88     glPushMatrix ();
  89     glTranslatef (-0.75, -0.50, 0.0);
  90     glRotatef (45.0, 0.0, 0.0, 1.0);
  91     glRotatef (45.0, 1.0, 0.0, 0.0);
  92     glMaterialfv(GL_FRONT, GL_DIFFUSE, cube_diffuse);
  93     glutSolidCube (1.5);
  94     glPopMatrix ();
  95
  96     glPushMatrix ();
  97     glTranslatef (0.75, 0.60, 0.0);
  98     glRotatef (30.0, 1.0, 0.0, 0.0);
  99     glMaterialfv(GL_FRONT, GL_DIFFUSE, sphere_diffuse);
 100     glutSolidSphere (1.0, 16, 16);
 101     glPopMatrix ();
 102
 103     glPushMatrix ();
 104     glTranslatef (0.70, -0.90, 0.25);
 105     glMaterialfv(GL_FRONT, GL_DIFFUSE, octa_diffuse);
 106     glutSolidOctahedron ();
 107     glPopMatrix ();
 108
 109     glPopMatrix ();
 110 }
 111
 112 #define ACSIZE  8
 113
 114 static void display(void)
 115 {
 116     GLint viewport[4];
 117     int jitter;
 118
 119     glGetIntegerv (GL_VIEWPORT, viewport);
 120
 121     glClear(GL_ACCUM_BUFFER_BIT);
 122     for (jitter = 0; jitter < ACSIZE; jitter++) {
 123         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 124         glPushMatrix ();
 125 /*      Note that 4.5 is the distance in world space between
 126  *      left and right and bottom and top.
 127  *      This formula converts fractional pixel movement to
 128  *      world coordinates.
 129  */
 130         glTranslatef (j8[jitter].x*4.5/viewport[2],
 131             j8[jitter].y*4.5/viewport[3], 0.0);
 132         displayObjects ();
 133         glPopMatrix ();
 134         glAccum(GL_ACCUM, 1.0/ACSIZE);
 135     }
 136     glAccum (GL_RETURN, 1.0);
 137     glFlush();
 138 }
 139
 140 static void myReshape(int w, int h)
 141 {
 142     glViewport(0, 0, w, h);
 143     glMatrixMode(GL_PROJECTION);
 144     glLoadIdentity();
 145     if (w <= h)
 146         glOrtho (-2.25, 2.25, -2.25*h/w, 2.25*h/w, -10.0, 10.0);
 147     else
 148         glOrtho (-2.25*w/h, 2.25*w/h, -2.25, 2.25, -10.0, 10.0);
 149     glMatrixMode(GL_MODELVIEW);
 150 }
 151
 152 static void
 153 key(unsigned char k, int x, int y)
 154 {
 155   switch (k) {
 156   case 27:  /* Escape */
 157     exit(0);
 158     break;
 159   default:
 160     return;
 161   }
 162   glutPostRedisplay();
 163 }
 164
 165 /*  Main Loop
 166  *  Open window with initial window size, title bar,
 167  *  RGBA display mode, and handle input events.
 168  */
 169 int main(int argc, char** argv)
 170 {
 171     glutInit(&argc, argv);
 172     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB
 173                         | GLUT_ACCUM | GLUT_DEPTH);
 174     glutInitWindowSize (250, 250);
 175     glutCreateWindow (argv[0]);
 176     myinit();
 177     glutReshapeFunc (myReshape);
 178     glutDisplayFunc(display);
 179     glutKeyboardFunc(key);
 180     glutMainLoop();
 181     return 0;             /* ANSI C requires main to return int. */
 182 }