progs/redbook/teapots.c

/* 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 * Unpublished-- rights reserved under the copyright laws of the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.
 */
/**
 *  teapots.c
 *  This program demonstrates lots of material properties.
 *  A single light source illuminates the objects.
 */
#include <stdlib.h>
#include <GL/glut.h>

/*
 * Initialize depth buffer, projection matrix, light source, and lighting
 * model.  Do not specify a material property here.
 */
static void
myinit(void)
{
  GLfloat ambient[] =
  {0.0, 0.0, 0.0, 1.0};
  GLfloat diffuse[] =
  {1.0, 1.0, 1.0, 1.0};
  GLfloat position[] =
  {0.0, 3.0, 3.0, 0.0};

  GLfloat lmodel_ambient[] =
  {0.2, 0.2, 0.2, 1.0};
  GLfloat local_view[] =
  {0.0};

  glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
  glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
  glLightfv(GL_LIGHT0, GL_POSITION, position);
  glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
  glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, local_view);

  glFrontFace(GL_CW);
  glEnable(GL_LIGHTING);
  glEnable(GL_LIGHT0);
  glEnable(GL_AUTO_NORMAL);
  glEnable(GL_NORMALIZE);
  glEnable(GL_DEPTH_TEST);
  glDepthFunc(GL_LESS);
}

/*
 * Move object into position.  Use 3rd through 12th parameters to specify the
 * material property.  Draw a teapot.
 */
static void
renderTeapot(GLfloat x, GLfloat y,
  GLfloat ambr, GLfloat ambg, GLfloat ambb,
  GLfloat difr, GLfloat difg, GLfloat difb,
  GLfloat specr, GLfloat specg, GLfloat specb, GLfloat shine)
{
  float mat[4];

  glPushMatrix();
  glTranslatef(x, y, 0.0);
  mat[0] = ambr;
  mat[1] = ambg;
  mat[2] = ambb;
  mat[3] = 1.0;
  glMaterialfv(GL_FRONT, GL_AMBIENT, mat);
  mat[0] = difr;
  mat[1] = difg;
  mat[2] = difb;
  glMaterialfv(GL_FRONT, GL_DIFFUSE, mat);
  mat[0] = specr;
  mat[1] = specg;
  mat[2] = specb;
  glMaterialfv(GL_FRONT, GL_SPECULAR, mat);
  glMaterialf(GL_FRONT, GL_SHININESS, shine * 128.0);
  glutSolidTeapot(1.0);
  glPopMatrix();
}

/**
 *  First column:  emerald, jade, obsidian, pearl, ruby, turquoise
 *  2nd column:  brass, bronze, chrome, copper, gold, silver
 *  3rd column:  black, cyan, green, red, white, yellow plastic
 *  4th column:  black, cyan, green, red, white, yellow rubber
 */
static void
display(void)
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  renderTeapot(2.0, 17.0, 0.0215, 0.1745, 0.0215,
    0.07568, 0.61424, 0.07568, 0.633, 0.727811, 0.633, 0.6);
  renderTeapot(2.0, 14.0, 0.135, 0.2225, 0.1575,
    0.54, 0.89, 0.63, 0.316228, 0.316228, 0.316228, 0.1);
  renderTeapot(2.0, 11.0, 0.05375, 0.05, 0.06625,
    0.18275, 0.17, 0.22525, 0.332741, 0.328634, 0.346435, 0.3);
  renderTeapot(2.0, 8.0, 0.25, 0.20725, 0.20725,
    1, 0.829, 0.829, 0.296648, 0.296648, 0.296648, 0.088);
  renderTeapot(2.0, 5.0, 0.1745, 0.01175, 0.01175,
    0.61424, 0.04136, 0.04136, 0.727811, 0.626959, 0.626959, 0.6);
  renderTeapot(2.0, 2.0, 0.1, 0.18725, 0.1745,
    0.396, 0.74151, 0.69102, 0.297254, 0.30829, 0.306678, 0.1);
  renderTeapot(6.0, 17.0, 0.329412, 0.223529, 0.027451,
    0.780392, 0.568627, 0.113725, 0.992157, 0.941176, 0.807843,
    0.21794872);
  renderTeapot(6.0, 14.0, 0.2125, 0.1275, 0.054,
    0.714, 0.4284, 0.18144, 0.393548, 0.271906, 0.166721, 0.2);
  renderTeapot(6.0, 11.0, 0.25, 0.25, 0.25,
    0.4, 0.4, 0.4, 0.774597, 0.774597, 0.774597, 0.6);
  renderTeapot(6.0, 8.0, 0.19125, 0.0735, 0.0225,
    0.7038, 0.27048, 0.0828, 0.256777, 0.137622, 0.086014, 0.1);
  renderTeapot(6.0, 5.0, 0.24725, 0.1995, 0.0745,
    0.75164, 0.60648, 0.22648, 0.628281, 0.555802, 0.366065, 0.4);
  renderTeapot(6.0, 2.0, 0.19225, 0.19225, 0.19225,
    0.50754, 0.50754, 0.50754, 0.508273, 0.508273, 0.508273, 0.4);
  renderTeapot(10.0, 17.0, 0.0, 0.0, 0.0, 0.01, 0.01, 0.01,
    0.50, 0.50, 0.50, .25);
  renderTeapot(10.0, 14.0, 0.0, 0.1, 0.06, 0.0, 0.50980392, 0.50980392,
    0.50196078, 0.50196078, 0.50196078, .25);
  renderTeapot(10.0, 11.0, 0.0, 0.0, 0.0,
    0.1, 0.35, 0.1, 0.45, 0.55, 0.45, .25);
  renderTeapot(10.0, 8.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0,
    0.7, 0.6, 0.6, .25);
  renderTeapot(10.0, 5.0, 0.0, 0.0, 0.0, 0.55, 0.55, 0.55,
    0.70, 0.70, 0.70, .25);
  renderTeapot(10.0, 2.0, 0.0, 0.0, 0.0, 0.5, 0.5, 0.0,
    0.60, 0.60, 0.50, .25);
  renderTeapot(14.0, 17.0, 0.02, 0.02, 0.02, 0.01, 0.01, 0.01,
    0.4, 0.4, 0.4, .078125);
  renderTeapot(14.0, 14.0, 0.0, 0.05, 0.05, 0.4, 0.5, 0.5,
    0.04, 0.7, 0.7, .078125);
  renderTeapot(14.0, 11.0, 0.0, 0.05, 0.0, 0.4, 0.5, 0.4,
    0.04, 0.7, 0.04, .078125);
  renderTeapot(14.0, 8.0, 0.05, 0.0, 0.0, 0.5, 0.4, 0.4,
    0.7, 0.04, 0.04, .078125);
  renderTeapot(14.0, 5.0, 0.05, 0.05, 0.05, 0.5, 0.5, 0.5,
    0.7, 0.7, 0.7, .078125);
  renderTeapot(14.0, 2.0, 0.05, 0.05, 0.0, 0.5, 0.5, 0.4,
    0.7, 0.7, 0.04, .078125);
  glFlush();
}

static void
myReshape(int w, int h)
{
  glViewport(0, 0, w, h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  if (w <= h)
    glOrtho(0.0, 16.0, 0.0, 18.0 * (GLfloat) h / (GLfloat) w,
      -10.0, 10.0);
  else
    glOrtho(0.0, 16.0 * (GLfloat) w / (GLfloat) h, 0.0, 18.0,
      -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);
  glutCreateWindow(argv[0]);
  myinit();
  glutReshapeFunc(myReshape);
  glutDisplayFunc(display);
  glutKeyboardFunc(key);
  glutMainLoop();
  return 0;             /* ANSI C requires main to return int. */
}