#
# Copyright (c) 1993-1997, Silicon Graphics, Inc.
# ALL RIGHTS RESERVED
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# any purpose and without fee is hereby granted, provided that the above
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# AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
# INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
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# 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# Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
#
# quadric.c
# This program demonstrates the use of some of the gluQuadric*
# routines. Quadric objects are created with some quadric
# properties and the callback routine to handle errors.
# Note that the cylinder has no top or bottom and the circle
# has a hole in it.
require 'opengl'
require 'glu'
require 'glut'
require 'mathn'
include Gl,Glu,Glut

$startList = nil

def init
  mat_ambient = [ 0.5, 0.5, 0.5, 1.0 ]
  mat_specular = [ 1.0, 1.0, 1.0, 1.0 ]
  mat_shininess = [ 50.0 ]
  light_position = [ 1.0, 1.0, 1.0, 0.0 ]
  model_ambient = [ 0.5, 0.5, 0.5, 1.0 ]

  glClearColor(0.0, 0.0, 0.0, 0.0)

  glMaterial(GL_FRONT, GL_AMBIENT, mat_ambient)
  glMaterial(GL_FRONT, GL_SPECULAR, mat_specular)
  glMaterial(GL_FRONT, GL_SHININESS, mat_shininess)
  glLight(GL_LIGHT0, GL_POSITION, light_position)
  glLightModel(GL_LIGHT_MODEL_AMBIENT, model_ambient)

  glEnable(GL_LIGHTING)
  glEnable(GL_LIGHT0)
  glEnable(GL_DEPTH_TEST)

  # Create 4 display lists, each with a different quadric object.
  # Different drawing styles and surface normal specifications
  # are demonstrated.
  $startList = glGenLists(4)
  qobj = gluNewQuadric()

  gluQuadricDrawStyle(qobj, GLU_FILL) # smooth shaded
  gluQuadricNormals(qobj, GLU_SMOOTH)
  glNewList($startList, GL_COMPILE)
  gluSphere(qobj, 0.75, 15, 10)
  glEndList()

  gluQuadricDrawStyle(qobj, GLU_FILL) # flat shaded
  gluQuadricNormals(qobj, GLU_FLAT)
  glNewList($startList+1, GL_COMPILE)
  gluCylinder(qobj, 0.5, 0.3, 1.0, 15, 5)
  glEndList()

  gluQuadricDrawStyle(qobj, GLU_LINE) # all polygons wireframe
  gluQuadricNormals(qobj, GLU_NONE)
  glNewList($startList+2, GL_COMPILE)
  gluDisk(qobj, 0.25, 1.0, 20, 4)
  glEndList()

  gluQuadricDrawStyle(qobj, GLU_SILHOUETTE) # boundary only
  gluQuadricNormals(qobj, GLU_NONE)
  glNewList($startList+3, GL_COMPILE)
  gluPartialDisk(qobj, 0.0, 1.0, 20, 4, 0.0, 225.0)
  glEndList()
end

display = Proc.new do
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
  glPushMatrix()

  glEnable(GL_LIGHTING)
  glShadeModel(GL_SMOOTH)
  glTranslate(-1.0, -1.0, 0.0)
  glCallList($startList)

  glShadeModel(GL_FLAT)
  glTranslate(0.0, 2.0, 0.0)
  glPushMatrix()
  glRotate(300.0, 1.0, 0.0, 0.0)
  glCallList($startList+1)
  glPopMatrix()

  glDisable(GL_LIGHTING)
  glColor(0.0, 1.0, 1.0)
  glTranslate(2.0, -2.0, 0.0)
  glCallList($startList+2)

  glColor(1.0, 1.0, 0.0)
  glTranslate(0.0, 2.0, 0.0)
  glCallList($startList+3)

  glPopMatrix()
  glutSwapBuffers()
end

reshape = Proc.new do |w, h|
  glViewport(0, 0,  w,  h)
  glMatrixMode(GL_PROJECTION)
  glLoadIdentity()
  if (w <= h)
    glOrtho(-2.5, 2.5, -2.5*h/w, 2.5*h/w, -10.0, 10.0)
  else
    glOrtho(-2.5*w/h, 2.5*w/h, -2.5, 2.5, -10.0, 10.0)
  end
  glMatrixMode(GL_MODELVIEW)
  glLoadIdentity()
end

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

# main
glutInit
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH)
glutInitWindowSize(500, 500)
glutInitWindowPosition(100, 100)
glutCreateWindow($0)
init()
glutDisplayFunc(display)
glutReshapeFunc(reshape)
glutKeyboardFunc(keyboard)
glutMainLoop()
