text: #!/usr/bin/env python
  # ----------------------------------------------------------------------------
  # pyglet
  # Copyright (c) 2006-2008 Alex Holkner
  # All rights reserved.
  # 
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions 
  # are met:
  #
  #  * Redistributions of source code must retain the above copyright
  #    notice, this list of conditions and the following disclaimer.
  #  * Redistributions in binary form must reproduce the above copyright 
  #    notice, this list of conditions and the following disclaimer in
  #    the documentation and/or other materials provided with the
  #    distribution.
  #  * Neither the name of pyglet nor the names of its
  #    contributors may be used to endorse or promote products
  #    derived from this software without specific prior written
  #    permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  # FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  # COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  # BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  # ----------------------------------------------------------------------------
  
  '''Demonstrates how to manage OpenGL calls between two independent windows.
  '''
  
  import pyglet
  from pyglet.gl import *
  
  def on_resize(width, height):
      glViewport(0, 0, width, height)
      glMatrixMode(GL_PROJECTION)
      glLoadIdentity()
      gluPerspective(60., width / float(height), 1., 100.)
      glMatrixMode(GL_MODELVIEW)
  
  def setup():
      glClearColor(1, 1, 1, 1)
      glColor3f(.5, .5, .5)
  
  def on_draw():
      glClear(GL_COLOR_BUFFER_BIT)
      glLoadIdentity()
      glTranslatef(0, 0, -5)
      glRotatef(r, 0, 0, 1)
      glRectf(-1, -1, 1, 1)
  
  r = 0
  def update(dt):
      global r
      r += 1
      if r > 360:
          r = 0
  pyglet.clock.schedule_interval(update, 1/20.)
  
  w1 = pyglet.window.Window(200, 200, caption='First window', resizable=True)
  w1.on_resize = on_resize
  w1.on_draw = on_draw
  w1.switch_to()
  setup()
  
  w2 = pyglet.window.Window(300, 300, caption='Second window', resizable=True)
  w2.on_resize = on_resize
  w2.on_draw = on_draw
  w2.switch_to()
  setup()
  
  pyglet.app.run()
  