/*
 * (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 * Unpublished-- rights reserved under the copyright laws of the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.
 */
/*
 *  scene.c
 *  This program demonstrates the use of the GL lighting model.
 *  Objects are drawn using a grey material characteristic. 
 *  A single light source illuminates the objects.
 */
#include <windows.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "glaux.h"

/*  Initialize material property and light source.
 */
void myinit (void)
{
    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };

    GLfloat rlight_diffuse[] =  { 0.9, 0.0, 0.0, 1.0 };
    GLfloat rlight_specular[] = { 0.9, 0.0, 0.0, 1.0 };
    GLfloat glight_diffuse[] =  { 0.0, 0.7, 0.0, 1.0 };
    GLfloat glight_specular[] = { 0.0, 0.7, 0.0, 1.0 };
    GLfloat blight_diffuse[] =  { 0.0, 0.0, 0.5, 1.0 };
    GLfloat blight_specular[] = { 0.0, 0.0, 0.5, 1.0 };

/*	light_position is NOT default value	*/
    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };

    glLightfv (GL_LIGHT0, GL_AMBIENT, light_ambient);
    glLightfv (GL_LIGHT0, GL_DIFFUSE, rlight_diffuse);
    glLightfv (GL_LIGHT0, GL_SPECULAR, rlight_specular);
    glLightfv (GL_LIGHT0, GL_POSITION, light_position);
    
    glLightfv (GL_LIGHT1, GL_AMBIENT, light_ambient);
    glLightfv (GL_LIGHT1, GL_DIFFUSE, glight_diffuse);
    glLightfv (GL_LIGHT1, GL_SPECULAR, glight_specular);
    glLightfv (GL_LIGHT1, GL_POSITION, light_position);
    
    glLightfv (GL_LIGHT2, GL_AMBIENT, light_ambient);
    glLightfv (GL_LIGHT2, GL_DIFFUSE, blight_diffuse);
    glLightfv (GL_LIGHT2, GL_SPECULAR, blight_specular);
    glLightfv (GL_LIGHT2, GL_POSITION, light_position);
    
    glEnable (GL_LIGHTING);
    glDepthFunc(GL_LESS);
    glEnable(GL_DEPTH_TEST);
}

void display (void)
{
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix ();
    glRotatef (20.0, 1.0, 0.0, 0.0);

    glEnable (GL_LIGHT0);
    glPushMatrix ();
    glTranslatef (-0.75, 0.5, 0.0); 
    glRotatef (90.0, 1.0, 0.0, 0.0);
    auxSolidTorus (0.275, 0.85);
    glPopMatrix ();

    glDisable (GL_LIGHT0);
    glEnable (GL_LIGHT1);
    glPushMatrix ();
    glTranslatef (-0.75, -0.5, 0.0); 
    glRotatef (270.0, 1.0, 0.0, 0.0);
    auxSolidCone (1.0, 2.0);
    glPopMatrix ();

    glDisable (GL_LIGHT1);
    glEnable (GL_LIGHT2);
    glPushMatrix ();
    glTranslatef (0.75, 0.0, -1.0); 
    auxSolidSphere (1.0);
    glPopMatrix ();
    glDisable (GL_LIGHT2);

    glPopMatrix ();
    glFlush ();
}

void myReshape (GLsizei w, GLsizei h)
{
    glViewport (0, 0, w, h);
    glMatrixMode (GL_PROJECTION);
    glLoadIdentity ();
    if (w <= h) 
	glOrtho (-2.5, 2.5, -2.5*(GLfloat)h/(GLfloat)w, 
	    2.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
    else 
	glOrtho (-2.5*(GLfloat)w/(GLfloat)h, 
	    2.5*(GLfloat)w/(GLfloat)h, -2.5, 2.5, -10.0, 10.0);
    glMatrixMode (GL_MODELVIEW);
}

/*  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 | AUX_DEPTH16);
    auxInitPosition (100, 50, 500, 500);
    auxInitWindow (argv[0]);
    myinit ();
    auxReshapeFunc (myReshape);
    auxMainLoop (display);
}