#
# 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# Unpublished-- rights reserved under the copyright laws of the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 'glu'
require 'glut'
include Gl,Glu,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]

  glLight(GL_LIGHT0, GL_AMBIENT, ambient)
  glLight(GL_LIGHT0, GL_DIFFUSE, diffuse)
  glLight(GL_LIGHT0, GL_POSITION, position)
  glLightModel(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient)
  glLightModel(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)
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 = []
  glPushMatrix()
  glTranslate(x, y, 0.0)
  mat[0] = ambr
  mat[1] = ambg
  mat[2] = ambb
  mat[3] = 1.0
  glMaterial(GL_FRONT, GL_AMBIENT, mat)
  mat[0] = difr
  mat[1] = difg
  mat[2] = difb
  glMaterial(GL_FRONT, GL_DIFFUSE, mat)
  mat[0] = specr
  mat[1] = specg
  mat[2] = specb
  glMaterial(GL_FRONT, GL_SPECULAR, mat)
  glMaterial(GL_FRONT, GL_SHININESS, shine * 128.0)
  glutSolidTeapot(1.0)
  glPopMatrix()
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 do
  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, 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)
  glutSwapBuffers()
end

myReshape = proc do |w, h|
  glViewport(0, 0, w, h)
  glMatrixMode(GL_PROJECTION)
  glLoadIdentity()
  if (w <= h)
    glOrtho(0.0, 16.0, 0.0, 16.0 *  h.to_f / w,  -10.0, 10.0)
  else
    glOrtho(0.0, 16.0 * w.to_f / h, 0.0, 16.0,-10.0, 10.0)
  end
  glMatrixMode(GL_MODELVIEW)
end

keyboard = Proc.new do |key, x, y|
  case (key)
    when ?\e
    exit(0);
  end
end

# Main Loop Open window with initial window size, title bar, RGBA display
# mode, and handle input events.
glutInit()
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
glutInitWindowSize(500, 500)
glutInitWindowPosition(100, 100)
glutCreateWindow()
myinit()
glutReshapeFunc(myReshape)
glutDisplayFunc(display)
glutKeyboardFunc(keyboard)
glutMainLoop()
