/*
 * (c) Copyright 1993, Silicon Graphics, Inc.
 * ALL RIGHTS RESERVED 
 * Permission to use, copy, modify, and distribute this software for 
 * any purpose and without fee is hereby granted, provided that the above
 * copyright notice appear in all copies and that both the copyright notice
 * and this permission notice appear in supporting documentation, and that 
 * the name of Silicon Graphics, Inc. not be used in advertising
 * or publicity pertaining to distribution of the software without specific,
 * 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
 * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
 * 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(c)(2) or subparagraph
 * (c)(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 * Unpublished-- rights reserved under the copyright laws of the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(TM) is a trademark of Silicon Graphics, Inc.
 */
/*
 *  stroke.c 
 *  This program demonstrates some characters of a 
 *  stroke (vector) font.  The characters are represented
 *  by display lists, which are given numbers which 
 *  correspond to the ASCII values of the characters.
 *  Use of glCallLists() is demonstrated.
 */
#include <GL/gl.h>
#include <GL/glu.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glaux.h>

#define PT 1
#define STROKE 2
#define END 3

typedef struct charpoint {
  GLfloat x, y;
  int type;
} CP;

CP Adata[] =
{
  {0, 0, PT},
  {0, 9, PT},
  {1, 10, PT},
  {4, 10, PT},
  {5, 9, PT},
  {5, 0, STROKE},
  {0, 5, PT},
  {5, 5, END}
};

CP Edata[] =
{
  {5, 0, PT},
  {0, 0, PT},
  {0, 10, PT},
  {5, 10, STROKE},
  {0, 5, PT},
  {4, 5, END}
};

CP Pdata[] =
{
  {0, 0, PT},
  {0, 10, PT},
  {4, 10, PT},
  {5, 9, PT},
  {5, 6, PT},
  {4, 5, PT},
  {0, 5, END}
};

CP Rdata[] =
{
  {0, 0, PT},
  {0, 10, PT},
  {4, 10, PT},
  {5, 9, PT},
  {5, 6, PT},
  {4, 5, PT},
  {0, 5, STROKE},
  {3, 5, PT},
  {5, 0, END}
};

CP Sdata[] =
{
  {0, 1, PT},
  {1, 0, PT},
  {4, 0, PT},
  {5, 1, PT},
  {5, 4, PT},
  {4, 5, PT},
  {1, 5, PT},
  {0, 6, PT},
  {0, 9, PT},
  {1, 10, PT},
  {4, 10, PT},
  {5, 9, END}
};

/*
 * drawLetter() interprets the instructions from the array
 * *  for that letter and renders the letter with line segments.
 */
void drawLetter(CP * l)
{
  glBegin(GL_LINE_STRIP);
  while (1) {
    switch (l->type) {
      case PT:
	glVertex2fv(&l->x);
	break;
      case STROKE:
	glVertex2fv(&l->x);
	glEnd();
	glBegin(GL_LINE_STRIP);
	break;
      case END:
	glVertex2fv(&l->x);
	glEnd();
	glTranslatef(8.0, 0.0, 0.0);
	return;
    }
    l++;
  }
}

/*
 * Create a display list for each of 6 characters       
 */
void myinit(void)
{
  GLuint base;

  glShadeModel(GL_FLAT);

  base = glGenLists(128);
  glListBase(base);
  glNewList(base + 'A', GL_COMPILE);
  drawLetter(Adata);
  glEndList();
  glNewList(base + 'E', GL_COMPILE);
  drawLetter(Edata);
  glEndList();
  glNewList(base + 'P', GL_COMPILE);
  drawLetter(Pdata);
  glEndList();
  glNewList(base + 'R', GL_COMPILE);
  drawLetter(Rdata);
  glEndList();
  glNewList(base + 'S', GL_COMPILE);
  drawLetter(Sdata);
  glEndList();
  glNewList(base + ' ', GL_COMPILE);
  glTranslatef(8.0, 0.0, 0.0);
  glEndList();
}

char *test1 = "A SPARE SERAPE APPEARS AS";
char *test2 = "APES PREPARE RARE PEPPERS";

void printStrokedString(char *s)
{
  GLsizei len = strlen(s);

  glCallLists(len, GL_BYTE, (GLbyte *) s);
}

void display(void)
{
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(1.0, 1.0, 1.0);
  glPushMatrix();
  glScalef(2.0, 2.0, 2.0);
  glTranslatef(10.0, 30.0, 0.0);
  printStrokedString(test1);
  glPopMatrix();
  glPushMatrix();
  glScalef(2.0, 2.0, 2.0);
  glTranslatef(10.0, 13.0, 0.0);
  printStrokedString(test2);
  glPopMatrix();
  glFlush();
}

/*
 * Main Loop
 * *  Open window with initial window size, title bar, 
 * *  RGBA display mode, and handle input events.
 */
int main(int argc, char **argv)
{
  auxInitDisplayMode(AUX_SINGLE | AUX_RGB);
  auxInitPosition(0, 0, 440, 120);
  if (!auxInitWindow(argv[0]))
    auxQuit();
  myinit();
  auxMainLoop(display);
  return 0;
}