progs/redbook/model.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  31  * Unpublished-- rights reserved under the copyright laws of the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  *  model.c
  40  *  This program demonstrates modeling transformations
  41  */
  42 #include <GL/glut.h>
  43 #include <stdlib.h>
  44
  45 void init(void)
  46 {
  47    glClearColor (0.0, 0.0, 0.0, 0.0);
  48    glShadeModel (GL_FLAT);
  49 }
  50
  51 void draw_triangle(void)
  52 {
  53    glBegin (GL_LINE_LOOP);
  54    glVertex2f(0.0, 25.0);
  55    glVertex2f(25.0, -25.0);
  56    glVertex2f(-25.0, -25.0);
  57    glEnd();
  58 }
  59
  60 void display(void)
  61 {
  62    glClear (GL_COLOR_BUFFER_BIT);
  63    glColor3f (1.0, 1.0, 1.0);
  64
  65    glLoadIdentity ();
  66    glColor3f (1.0, 1.0, 1.0);
  67    draw_triangle ();
  68
  69    glEnable (GL_LINE_STIPPLE);
  70    glLineStipple (1, 0xF0F0);
  71    glLoadIdentity ();
  72    glTranslatef (-20.0, 0.0, 0.0);
  73    draw_triangle ();
  74
  75    glLineStipple (1, 0xF00F);
  76    glLoadIdentity ();
  77    glScalef (1.5, 0.5, 1.0);
  78    draw_triangle ();
  79
  80    glLineStipple (1, 0x8888);
  81    glLoadIdentity ();
  82    glRotatef (90.0, 0.0, 0.0, 1.0);
  83    draw_triangle ();
  84    glDisable (GL_LINE_STIPPLE);
  85
  86    glFlush ();
  87 }
  88
  89 void reshape (int w, int h)
  90 {
  91    glViewport (0, 0, (GLsizei) w, (GLsizei) h);
  92    glMatrixMode (GL_PROJECTION);
  93    glLoadIdentity ();
  94    if (w <= h)
  95       glOrtho (-50.0, 50.0, -50.0*(GLfloat)h/(GLfloat)w,
  96          50.0*(GLfloat)h/(GLfloat)w, -1.0, 1.0);
  97    else
  98       glOrtho (-50.0*(GLfloat)w/(GLfloat)h,
  99          50.0*(GLfloat)w/(GLfloat)h, -50.0, 50.0, -1.0, 1.0);
 100    glMatrixMode(GL_MODELVIEW);
 101 }
 102
 103 /* ARGSUSED1 */
 104 void keyboard(unsigned char key, int x, int y)
 105 {
 106    switch (key) {
 107       case 27:
 108          exit(0);
 109          break;
 110    }
 111 }
 112
 113 int main(int argc, char** argv)
 114 {
 115    glutInit(&argc, argv);
 116    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
 117    glutInitWindowSize (500, 500);
 118    glutInitWindowPosition (100, 100);
 119    glutCreateWindow (argv[0]);
 120    init ();
 121    glutDisplayFunc(display);
 122    glutReshapeFunc(reshape);
 123    glutKeyboardFunc (keyboard);
 124    glutMainLoop();
 125    return 0;
 126 }