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

## Detailed Description

This program demonstrates the use of local versus infinite lighting on a flat plane.

    /* Copyright (c) Mark J. Kilgard, 1994. */

    /*
     * (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     * Unpublished-- rights reserved under the copyright laws of the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.
     */

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

    /*  Initialize material property, light source, and lighting model.
     */
    void myinit(void)
    {
        GLfloat mat_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
    /*   mat_specular and mat_shininess are NOT default values  */
        GLfloat mat_diffuse[] = { 0.4, 0.4, 0.4, 1.0 };
        GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_shininess[] = { 15.0 };

        GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
        GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat lmodel_ambient[] = { 0.2, 0.2, 0.2, 1.0 };

        glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
        glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
        glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
        glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
        glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
        glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);

        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glDepthFunc(GL_LESS);
        glEnable(GL_DEPTH_TEST);
    }

    void drawPlane(void)
    {
        glBegin (GL_QUADS);
        glNormal3f (0.0, 0.0, 1.0);
        glVertex3f (-1.0, -1.0, 0.0);
        glVertex3f (0.0, -1.0, 0.0);
        glVertex3f (0.0, 0.0, 0.0);
        glVertex3f (-1.0, 0.0, 0.0);

        glNormal3f (0.0, 0.0, 1.0);
        glVertex3f (0.0, -1.0, 0.0);
        glVertex3f (1.0, -1.0, 0.0);
        glVertex3f (1.0, 0.0, 0.0);
        glVertex3f (0.0, 0.0, 0.0);

        glNormal3f (0.0, 0.0, 1.0);
        glVertex3f (0.0, 0.0, 0.0);
        glVertex3f (1.0, 0.0, 0.0);
        glVertex3f (1.0, 1.0, 0.0);
        glVertex3f (0.0, 1.0, 0.0);

        glNormal3f (0.0, 0.0, 1.0);
        glVertex3f (0.0, 0.0, 0.0);
        glVertex3f (0.0, 1.0, 0.0);
        glVertex3f (-1.0, 1.0, 0.0);
        glVertex3f (-1.0, 0.0, 0.0);
        glEnd();
    }

    void display (void)
    {
        GLfloat infinite_light[] = { 1.0, 1.0, 1.0, 0.0 };
        GLfloat local_light[] = { 1.0, 1.0, 1.0, 1.0 };

        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glPushMatrix ();
        glTranslatef (-1.5, 0.0, 0.0);
        glLightfv (GL_LIGHT0, GL_POSITION, infinite_light);
        drawPlane ();
        glPopMatrix ();

        glPushMatrix ();
        glTranslatef (1.5, 0.0, 0.0);
        glLightfv (GL_LIGHT0, GL_POSITION, local_light);
        drawPlane ();
        glPopMatrix ();
        glFlush ();
    }

    void myReshape(int w, int h)
    {
        glViewport (0, 0, w, h);
        glMatrixMode (GL_PROJECTION);
        glLoadIdentity ();
        if (w <= h)
        glOrtho (-1.5, 1.5, -1.5*(GLdouble)h/(GLdouble)w,
            1.5*(GLdouble)h/(GLdouble)w, -10.0, 10.0);
        else
        glOrtho (-1.5*(GLdouble)w/(GLdouble)h,
            1.5*(GLdouble)w/(GLdouble)h, -1.5, 1.5, -10.0, 10.0);
        glMatrixMode (GL_MODELVIEW);
    }

    static void
    key(unsigned char k, int x, int y)
    {
      switch (k) {
      case 27:  /* Escape */
        exit(0);
        break;
      default:
        return;
      }
      glutPostRedisplay();
    }

    /*  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 | GLUT_DEPTH);
        glutInitWindowSize (500, 200);
        glutCreateWindow (argv[0]);
        myinit();
        glutReshapeFunc (myReshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;             /* ANSI C requires main to return int. */
    }

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