progs/redbook/list.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  31  * Unpublished-- rights reserved under the copyright laws of the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  *  list.c
  40  *  This program demonstrates how to make and execute a
  41  *  display list.  Note that attributes, such as current
  42  *  color and matrix, are changed.
  43  */
  44 #include <GL/glut.h>
  45 #include <stdlib.h>
  46
  47 GLuint listName;
  48
  49 static void init (void)
  50 {
  51    listName = glGenLists (1);
  52    glNewList (listName, GL_COMPILE);
  53       glColor3f (1.0, 0.0, 0.0);  /*  current color red  */
  54       glBegin (GL_TRIANGLES);
  55       glVertex2f (0.0, 0.0);
  56       glVertex2f (1.0, 0.0);
  57       glVertex2f (0.0, 1.0);
  58       glEnd ();
  59       glTranslatef (1.5, 0.0, 0.0); /*  move position  */
  60    glEndList ();
  61    glShadeModel (GL_FLAT);
  62 }
  63
  64 static void drawLine (void)
  65 {
  66    glBegin (GL_LINES);
  67    glVertex2f (0.0, 0.5);
  68    glVertex2f (15.0, 0.5);
  69    glEnd ();
  70 }
  71
  72 void display(void)
  73 {
  74    GLuint i;
  75
  76    glClear (GL_COLOR_BUFFER_BIT);
  77    glColor3f (0.0, 1.0, 0.0);  /*  current color green  */
  78    for (i = 0; i < 10; i++)    /*  draw 10 triangles    */
  79       glCallList (listName);
  80    drawLine ();  /*  is this line green?  NO!  */
  81                  /*  where is the line drawn?  */
  82    glFlush ();
  83 }
  84
  85 void reshape(int w, int h)
  86 {
  87    glViewport(0, 0, w, h);
  88    glMatrixMode(GL_PROJECTION);
  89    glLoadIdentity();
  90    if (w <= h)
  91       gluOrtho2D (0.0, 2.0, -0.5 * (GLfloat) h/(GLfloat) w,
  92          1.5 * (GLfloat) h/(GLfloat) w);
  93    else
  94       gluOrtho2D (0.0, 2.0 * (GLfloat) w/(GLfloat) h, -0.5, 1.5);
  95    glMatrixMode(GL_MODELVIEW);
  96    glLoadIdentity();
  97 }
  98
  99 /* ARGSUSED1 */
 100 void keyboard(unsigned char key, int x, int y)
 101 {
 102    switch (key) {
 103       case 27:
 104          exit(0);
 105          break;
 106    }
 107 }
 108
 109 /*  Main Loop
 110  *  Open window with initial window size, title bar,
 111  *  RGBA display mode, and handle input events.
 112  */
 113 int main(int argc, char** argv)
 114 {
 115    glutInit(&argc, argv);
 116    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
 117    glutInitWindowSize(650, 50);
 118    glutCreateWindow(argv[0]);
 119    init ();
 120    glutReshapeFunc (reshape);
 121    glutDisplayFunc (display);
 122    glutKeyboardFunc (keyboard);
 123    glutMainLoop();
 124    return 0;
 125 }