OpenGLUT 0.6.3 development - OpenGLUT: smooth.c File Reference
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# smooth.c File Reference

## Detailed Description

This program demonstrates smooth shading.

A smooth shaded polygon is drawn in a 2-D projection.

    /*
     * Copyright (c) 1993-1997, 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     * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
     */

    #include <GL/openglut.h>
    #include <stdlib.h>

    void init(void)
    {
       glClearColor (0.0, 0.0, 0.0, 0.0);
       glShadeModel (GL_SMOOTH);
    }

    void triangle(void)
    {
       glBegin (GL_TRIANGLES);
       glColor3f (1.0, 0.0, 0.0);
       glVertex2f (5.0, 5.0);
       glColor3f (0.0, 1.0, 0.0);
       glVertex2f (25.0, 5.0);
       glColor3f (0.0, 0.0, 1.0);
       glVertex2f (5.0, 25.0);
       glEnd();
    }

    void display(void)
    {
       glClear (GL_COLOR_BUFFER_BIT);
       triangle ();
       glFlush ();
    }

    void reshape (int w, int h)
    {
       glViewport (0, 0, (GLsizei) w, (GLsizei) h);
       glMatrixMode (GL_PROJECTION);
       glLoadIdentity ();
       if (w <= h)
          gluOrtho2D (0.0, 30.0, 0.0, 30.0 * (GLfloat) h/(GLfloat) w);
       else
          gluOrtho2D (0.0, 30.0 * (GLfloat) w/(GLfloat) h, 0.0, 30.0);
       glMatrixMode(GL_MODELVIEW);
    }

    /* ARGSUSED1 */
    void keyboard(unsigned char key, int x, int y)
    {
       switch (key) {
          case 27:
             exit(0);
             break;
       }
    }

    int main(int argc, char** argv)
    {
       glutInit(&argc, argv);
       glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
       glutInitWindowSize (500, 500);
       glutInitWindowPosition (100, 100);
       glutCreateWindow (argv[0]);
       init ();
       glutDisplayFunc(display);
       glutReshapeFunc(reshape);
       glutKeyboardFunc (keyboard);
       glutMainLoop();
       return 0;
    }

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