Bitmapped Character

/*

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  • written prior permission.
  • THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU “AS-IS”
  • AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
  • INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
  • FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
  • GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
  • SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
  • KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
  • LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
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  • ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
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  • POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
  • US Government Users Restricted Rights
  • Use, duplication, or disclosure by the Government is subject to
  • restrictions set forth in FAR 52.227.19©(2) or subparagraph
  • ©(1)(ii) of the Rights in Technical Data and Computer Software
  • clause at DFARS 252.227-7013 and/or in similar or successor
  • clauses in the FAR or the DOD or NASA FAR Supplement.
  • Unpublished-- rights reserved under the copyright laws of the
  • United States. Contractor/manufacturer is Silicon Graphics,
  • Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
  • OpenGL® is a registered trademark of Silicon Graphics, Inc.
    */

/*

  • drawf.c
  • Draws the bitmapped letter F on the screen (several times).
  • This demonstrates use of the glBitmap() call.
    */
    #include <GL/glut.h>
    #include <stdlib.h>

GLubyte rasters[24] = {
0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
0xff, 0x00, 0xff, 0x00, 0xc0, 0x00, 0xc0, 0x00, 0xc0, 0x00,
0xff, 0xc0, 0xff, 0xc0};

void init(void)
{
glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
glClearColor (0.0, 0.0, 0.0, 0.0);
}

void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f (1.0, 1.0, 1.0);
glRasterPos2i (20, 20);
glBitmap (10, 12, 0.0, 0.0, 11.0, 0.0, rasters);
glBitmap (10, 12, 0.0, 0.0, 11.0, 0.0, rasters);
glBitmap (10, 12, 0.0, 0.0, 11.0, 0.0, rasters);
glFlush();
}

void reshape(int w, int h)
{
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho (0, w, 0, h, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}

void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 27:
exit(0);
}
}

/* Main Loop

  • Open window with initial window size, title bar,
  • RGBA display mode, and handle input events.
    /
    int main(int argc, char
    * argv)
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(100, 100);
    glutInitWindowPosition(100, 100);
    glutCreateWindow(argv[0]);
    init();
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(display);
    glutMainLoop();
    return 0;
    }

how to change for displaying “F F F” to “Z Z Z”?

Look here