#
#/* 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# * Unpublished-- rights reserved under the copyright laws of the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.
# */
require "opengl"
require "glut"

#/*
# * Initialize depth buffer, projection matrix, light source, and lighting
# * model.  Do not specify a material property here.
# */
def myinit
  ambient = [0.0, 0.0, 0.0, 1.0];
  diffuse = [1.0, 1.0, 1.0, 1.0];
  position = [0.0, 3.0, 3.0, 0.0];

  lmodel_ambient = [0.2, 0.2, 0.2, 1.0];
  local_view = [0.0];

  GL::Light(GL::LIGHT0, GL::AMBIENT, ambient);
  GL::Light(GL::LIGHT0, GL::DIFFUSE, diffuse);
  GL::Light(GL::LIGHT0, GL::POSITION, position);
  GL::LightModel(GL::LIGHT_MODEL_AMBIENT, lmodel_ambient);
  GL::LightModel(GL::LIGHT_MODEL_LOCAL_VIEWER, local_view);

  GL::FrontFace(GL::CW);
  GL::Enable(GL::LIGHTING);
  GL::Enable(GL::LIGHT0);
  GL::Enable(GL::AUTO_NORMAL);
  GL::Enable(GL::NORMALIZE);
  GL::Enable(GL::DEPTH_TEST);
  GL::DepthFunc(GL::LESS);
end

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

  GL::PushMatrix();
  GL::Translate(x, y, 0.0);
  mat[0] = ambr;
  mat[1] = ambg;
  mat[2] = ambb;
  mat[3] = 1.0;
  GL::Material(GL::FRONT, GL::AMBIENT, mat);
  mat[0] = difr;
  mat[1] = difg;
  mat[2] = difb;
  GL::Material(GL::FRONT, GL::DIFFUSE, mat);
  mat[0] = specr;
  mat[1] = specg;
  mat[2] = specb;
  GL::Material(GL::FRONT, GL::SPECULAR, mat);
  GL::Material(GL::FRONT, GL::SHININESS, shine * 128.0);
  GLUT::SolidTeapot(1.0);
  GL::PopMatrix();
end

#/**
# *  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
# */
display = proc {
  GL::Clear(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, 0.25);
  renderTeapot(10.0, 14.0, 0.0, 0.1, 0.06, 0.0, 0.50980392, 0.50980392,
    0.50196078, 0.50196078, 0.50196078, 0.25);
  renderTeapot(10.0, 11.0, 0.0, 0.0, 0.0,
    0.1, 0.35, 0.1, 0.45, 0.55, 0.45, 0.25);
  renderTeapot(10.0, 8.0, 0.0, 0.0, 0.0, 0.5, 0.0, 0.0,
    0.7, 0.6, 0.6, 0.25);
  renderTeapot(10.0, 5.0, 0.0, 0.0, 0.0, 0.55, 0.55, 0.55,
    0.70, 0.70, 0.70, 0.25);
  renderTeapot(10.0, 2.0, 0.0, 0.0, 0.0, 0.5, 0.5, 0.0,
    0.60, 0.60, 0.50, 0.25);
  renderTeapot(14.0, 17.0, 0.02, 0.02, 0.02, 0.01, 0.01, 0.01,
    0.4, 0.4, 0.4, 0.078125);
  renderTeapot(14.0, 14.0, 0.0, 0.05, 0.05, 0.4, 0.5, 0.5,
    0.04, 0.7, 0.7, 0.078125);
  renderTeapot(14.0, 11.0, 0.0, 0.05, 0.0, 0.4, 0.5, 0.4,
    0.04, 0.7, 0.04, 0.078125);
  renderTeapot(14.0, 8.0, 0.05, 0.0, 0.0, 0.5, 0.4, 0.4,
    0.7, 0.04, 0.04, 0.078125);
  renderTeapot(14.0, 5.0, 0.05, 0.05, 0.05, 0.5, 0.5, 0.5,
    0.7, 0.7, 0.7, 0.078125);
  renderTeapot(14.0, 2.0, 0.05, 0.05, 0.0, 0.5, 0.5, 0.4,
    0.7, 0.7, 0.04, 0.078125);
  GL::Flush();
}

myReshape = proc {|w, h|
  GL::Viewport(0, 0, w, h);
  GL::MatrixMode(GL::PROJECTION);
  GL::LoadIdentity();
  if (w <= h)
    GL::Ortho(0.0, 16.0, 0.0, 16.0 *  h.to_f / w,
      -10.0, 10.0);
  else
    GL::Ortho(0.0, 16.0 * w.to_f / h, 0.0, 16.0,
      -10.0, 10.0);
  end
  GL::MatrixMode(GL::MODELVIEW);
}

#/*
# * Main Loop Open window with initial window size, title bar, RGBA display
# * mode, and handle input events.
# */
  GLUT::Init()
  GLUT::InitDisplayMode(GLUT::SINGLE | GLUT::RGB | GLUT::DEPTH);
  GLUT::CreateWindow()
  myinit();
  GLUT::ReshapeFunc(myReshape);
  GLUT::DisplayFunc(display);
  GLUT::MainLoop();