progs/redbook/font.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  31  * Unpublished-- rights reserved under the copyright laws of the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  *  font.c
  40  *
  41  *  Draws some text in a bitmapped font.  Uses glBitmap()
  42  *  and other pixel routines.  Also demonstrates use of
  43  *  display lists.
  44  */
  45 #include <GL/glut.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 GLubyte space[] =
  50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
  51
  52 GLubyte letters[][13] = {
  53 {0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xc3, 0xc3, 0xc3, 0x66, 0x3c, 0x18},
  54 {0x00, 0x00, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe},
  55 {0x00, 0x00, 0x7e, 0xe7, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xe7, 0x7e},
  56 {0x00, 0x00, 0xfc, 0xce, 0xc7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc7, 0xce, 0xfc},
  57 {0x00, 0x00, 0xff, 0xc0, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xc0, 0xff},
  58 {0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfc, 0xc0, 0xc0, 0xc0, 0xff},
  59 {0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xcf, 0xc0, 0xc0, 0xc0, 0xc0, 0xe7, 0x7e},
  60 {0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xff, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3},
  61 {0x00, 0x00, 0x7e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x7e},
  62 {0x00, 0x00, 0x7c, 0xee, 0xc6, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06, 0x06},
  63 {0x00, 0x00, 0xc3, 0xc6, 0xcc, 0xd8, 0xf0, 0xe0, 0xf0, 0xd8, 0xcc, 0xc6, 0xc3},
  64 {0x00, 0x00, 0xff, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0},
  65 {0x00, 0x00, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xdb, 0xff, 0xff, 0xe7, 0xc3},
  66 {0x00, 0x00, 0xc7, 0xc7, 0xcf, 0xcf, 0xdf, 0xdb, 0xfb, 0xf3, 0xf3, 0xe3, 0xe3},
  67 {0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xe7, 0x7e},
  68 {0x00, 0x00, 0xc0, 0xc0, 0xc0, 0xc0, 0xc0, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe},
  69 {0x00, 0x00, 0x3f, 0x6e, 0xdf, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0x66, 0x3c},
  70 {0x00, 0x00, 0xc3, 0xc6, 0xcc, 0xd8, 0xf0, 0xfe, 0xc7, 0xc3, 0xc3, 0xc7, 0xfe},
  71 {0x00, 0x00, 0x7e, 0xe7, 0x03, 0x03, 0x07, 0x7e, 0xe0, 0xc0, 0xc0, 0xe7, 0x7e},
  72 {0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0xff},
  73 {0x00, 0x00, 0x7e, 0xe7, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3},
  74 {0x00, 0x00, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3},
  75 {0x00, 0x00, 0xc3, 0xe7, 0xff, 0xff, 0xdb, 0xdb, 0xc3, 0xc3, 0xc3, 0xc3, 0xc3},
  76 {0x00, 0x00, 0xc3, 0x66, 0x66, 0x3c, 0x3c, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3},
  77 {0x00, 0x00, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x3c, 0x3c, 0x66, 0x66, 0xc3},
  78 {0x00, 0x00, 0xff, 0xc0, 0xc0, 0x60, 0x30, 0x7e, 0x0c, 0x06, 0x03, 0x03, 0xff}
  79 };
  80
  81 GLuint fontOffset;
  82
  83 static void makeRasterFont(void)
  84 {
  85    GLuint i, j;
  86    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  87
  88    fontOffset = glGenLists (128);
  89    for (i = 0,j = 'A'; i < 26; i++,j++) {
  90       glNewList(fontOffset + j, GL_COMPILE);
  91       glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, letters[i]);
  92       glEndList();
  93    }
  94    glNewList(fontOffset + ' ', GL_COMPILE);
  95    glBitmap(8, 13, 0.0, 2.0, 10.0, 0.0, space);
  96    glEndList();
  97 }
  98
  99 static void init(void)
 100 {
 101    glShadeModel (GL_FLAT);
 102    makeRasterFont();
 103 }
 104
 105 static void printString(char *s)
 106 {
 107    glPushAttrib (GL_LIST_BIT);
 108    glListBase(fontOffset);
 109    glCallLists((GLsizei) strlen(s), GL_UNSIGNED_BYTE, (GLubyte *) s);
 110    glPopAttrib ();
 111 }
 112
 113 /* Everything above this line could be in a library
 114  * that defines a font.  To make it work, you've got
 115  * to call makeRasterFont() before you start making
 116  * calls to printString().
 117  */
 118 static void display(void)
 119 {
 120    GLfloat white[3] = { 1.0, 1.0, 1.0 };
 121
 122    glClear(GL_COLOR_BUFFER_BIT);
 123    glColor3fv(white);
 124
 125    glRasterPos2i(20, 60);
 126    printString("THE QUICK BROWN FOX JUMPS");
 127    glRasterPos2i(20, 40);
 128    printString("OVER A LAZY DOG");
 129    glFlush ();
 130 }
 131
 132 static void reshape(int w, int h)
 133 {
 134    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
 135    glMatrixMode(GL_PROJECTION);
 136    glLoadIdentity();
 137    glOrtho (0.0, w, 0.0, h, -1.0, 1.0);
 138    glMatrixMode(GL_MODELVIEW);
 139 }
 140
 141 /* ARGSUSED1 */
 142 static void keyboard(unsigned char key, int x, int y)
 143 {
 144    switch (key) {
 145       case 27:
 146          exit(0);
 147    }
 148 }
 149
 150 /*  Main Loop
 151  *  Open window with initial window size, title bar,
 152  *  RGBA display mode, and handle input events.
 153  */
 154 int main(int argc, char** argv)
 155 {
 156    glutInit(&argc, argv);
 157    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
 158    glutInitWindowSize(300, 100);
 159    glutInitWindowPosition (100, 100);
 160    glutCreateWindow(argv[0]);
 161    init();
 162    glutReshapeFunc(reshape);
 163    glutKeyboardFunc(keyboard);
 164    glutDisplayFunc(display);
 165    glutMainLoop();
 166    return 0;
 167 }