#/*
# * Copyright (c) 1993-1997, 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# * Unpublished-- rights reserved under the copyright laws of the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(R) is a registered trademark of Silicon Graphics, Inc.
# */
#
#/*
# *  aapoly.c
# *  This program draws filled polygons with antialiased
# *  edges.  The special GL_SRC_ALPHA_SATURATE blending 
# *  function is used.
# *  Pressing the 't' key turns the antialiasing on and off.
# */



require '../RUDL'; include RUDL
require "opengl"

require 'glut'

require "rational"



STDOUT.sync = TRUE



$year = 0; $day = 0;



def init

   GL.ClearColor(0.0, 0.0, 0.0, 0.0);

   GL.ShadeModel(GL::FLAT);

end



display = Proc.new {

   GL.Clear(GL::COLOR_BUFFER_BIT);

   GL.Color(1.0, 1.0, 1.0);



   GL.PushMatrix();

   GLUT.WireSphere(1.0, 20, 16);   # draw sun */

   GL.Rotate($year, 0.0, 1.0, 0.0);

   GL.Translate(2.0, 0.0, 0.0);

   GL.Rotate($day, 0.0, 1.0, 0.0);

   GLUT.WireSphere(0.2, 10, 8);    # draw smaller planet */

   GL.PopMatrix();

}



reshape = Proc.new { |w, h|

   GL.Viewport(0, 0,  w,  h); 

   GL.MatrixMode(GL::PROJECTION);

   GL.LoadIdentity();

   GLU.Perspective(60.0,  w.to_f/h.to_f, 1.0, 20.0);

   GL.MatrixMode(GL::MODELVIEW);

   GL.LoadIdentity();

   GLU.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

}



include Constant



$d=DisplaySurface.new([640,480], OPENGL|DOUBLEBUF|FULLSCREEN)

init



Key.set_repeat(1,10)



done=false



while !done

	event=EventQueue.poll

	case event

		when QuitEvent

			done=true

		when KeyDownEvent

			case event.key

				when K_ESCAPE

					done=true

				when K_LEFT

					$day = ($day + 10) % 360

				when K_RIGHT

					$day = ($day - 10) % 360

				when K_UP

					$year = ($year + 5) % 360

				when K_DOWN

					$year = ($year - 5) % 360

			end

	end

	reshape.call(400,400)

	display.call

	$d.flip

end

