progs/redbook/polys.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  34  * Unpublished-- rights reserved under the copyright laws of the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  *  polys.c
  42  *  This program demonstrates polygon stippling.
  43  */
  44 #include <stdlib.h>
  45 #include <GL/glut.h>
  46
  47 void display(void)
  48 {
  49     GLubyte fly[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  50 0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60, 0x04, 0x60, 0x06, 0x20,
  51 0x04, 0x30, 0x0C, 0x20, 0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
  52 0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22, 0x44, 0x01, 0x80, 0x22,
  53 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
  54 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x66, 0x01, 0x80, 0x66,
  55 0x33, 0x01, 0x80, 0xCC, 0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
  56 0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0, 0x03, 0x31, 0x8c, 0xc0,
  57 0x03, 0x33, 0xcc, 0xc0, 0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,
  58 0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08, 0x10, 0x63, 0xC6, 0x08,
  59 0x10, 0x30, 0x0c, 0x08, 0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};
  60
  61     GLubyte halftone[] = {
  62 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
  63 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
  64 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
  65 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
  66 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
  67 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
  68 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
  69 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
  70 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA,
  71 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
  72 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55};
  73
  74     glClear (GL_COLOR_BUFFER_BIT);
  75
  76 /*  draw all polygons in white  */
  77     glColor3f (1.0, 1.0, 1.0);
  78
  79 /*  draw one solid, unstippled rectangle,       */
  80 /*  then two stippled rectangles                */
  81     glRectf (25.0, 25.0, 125.0, 125.0);
  82     glEnable (GL_POLYGON_STIPPLE);
  83     glPolygonStipple (fly);
  84     glRectf (125.0, 25.0, 225.0, 125.0);
  85     glPolygonStipple (halftone);
  86     glRectf (225.0, 25.0, 325.0, 125.0);
  87     glDisable (GL_POLYGON_STIPPLE);
  88
  89     glFlush ();
  90 }
  91
  92 void myinit (void)
  93 {
  94 /*  clear background to black   */
  95     glClearColor (0.0, 0.0, 0.0, 0.0);
  96     glShadeModel (GL_FLAT);
  97 }
  98
  99 static void reshape(GLsizei w, GLsizei h)
 100 {
 101     glViewport(0, 0, w, h);
 102     glMatrixMode(GL_PROJECTION);
 103     glLoadIdentity();
 104     glOrtho(0.0, (GLdouble)w, 0.0, (GLdouble)h, -1.0, 1.0);
 105     glMatrixMode(GL_MODELVIEW);
 106     glLoadIdentity();
 107 }
 108
 109 static void
 110 key(unsigned char k, int x, int y)
 111 {
 112   switch (k) {
 113   case 27:  /* Escape */
 114     exit(0);
 115     break;
 116   default:
 117     break;
 118   }
 119   glutPostRedisplay();
 120 }
 121
 122 /*  Main Loop
 123  *  Open window with initial window size, title bar,
 124  *  RGBA display mode, and handle input events.
 125  */
 126 int main(int argc, char** argv)
 127 {
 128     glutInit(&argc, argv);
 129     glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
 130     glutInitWindowSize (350, 150);
 131     glutCreateWindow (argv[0]);
 132     myinit ();
 133     glutDisplayFunc(display);
 134     glutReshapeFunc(reshape);
 135     glutKeyboardFunc(key);
 136     glutMainLoop();
 137     return 0;             /* ANSI C requires main to return int. */
 138 }