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#/*
# * 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# * Unpublished-- rights reserved under the copyright laws of the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.
# */
#
#/*
# * clip.c
# * This program demonstrates arbitrary clipping planes.
# */
require "opengl"
require "glut"
require "mathn"
def init
GL.ClearColor(0.0, 0.0, 0.0, 0.0);
GL.ShadeModel(GL::FLAT);
end
display = Proc.new {
eqn = [0.0, 1.0, 0.0, 0.0];
eqn2 = [1.0, 0.0, 0.0, 0.0];
GL.Clear(GL::COLOR_BUFFER_BIT);
GL.Color(1.0, 1.0, 1.0);
GL.PushMatrix();
GL.Translate(0.0, 0.0, -5.0);
# /* clip lower half -- y < 0 */
GL.ClipPlane(GL::CLIP_PLANE0, eqn);
GL.Enable(GL::CLIP_PLANE0);
# /* clip left half -- x < 0 */
GL.ClipPlane(GL::CLIP_PLANE1, eqn2);
GL.Enable(GL::CLIP_PLANE1);
GL.Rotate(90.0, 1.0, 0.0, 0.0);
GLUT.WireSphere(1.0, 20, 16);
GL.PopMatrix();
GL.Flush();
}
reshape = Proc.new {|w, h|
GL.Viewport(0, 0, w, h);
GL.MatrixMode(GL::PROJECTION);
GL.LoadIdentity();
GLU.Perspective(60.0, w/ h, 1.0, 20.0);
GL.MatrixMode(GL::MODELVIEW);
}
# /* ARGSUSED1 */
keyboard = Proc.new {|key, x, y|
case (key)
when 27
exit(0);
end
}
#int main(int argc, char** argv)
#{
GLUT.Init
GLUT.InitDisplayMode(GLUT::SINGLE | GLUT::RGB);
GLUT.InitWindowSize(500, 500);
GLUT.InitWindowPosition(100, 100);
GLUT.CreateWindow($0);
init();
GLUT.DisplayFunc(display);
GLUT.ReshapeFunc(reshape);
GLUT.KeyboardFunc(keyboard);
GLUT.MainLoop();
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