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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# Unpublished-- rights reserved under the copyright laws of the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.
#/
#
# double.c
# This is a simple double buffered program.
# Pressing the left mouse button rotates the rectangle.
# Pressing the middle mouse button stops the rotation.
#/
require "opengl"
require "glut"
require "rational"
$spin = 0.0;
display = Proc.new {
GL.Clear(GL::COLOR_BUFFER_BIT);
GL.PushMatrix();
GL.Rotate($spin, 0.0, 0.0, 1.0);
GL.Color(1.0, 1.0, 1.0);
GL.Rect(-25.0, -25.0, 25.0, 25.0);
GL.PopMatrix();
GLUT.SwapBuffers();
}
$spinDisplay = Proc.new {
$spin = $spin + 4.0;
$spin = $spin - 360.0 if ($spin > 360.0)
GLUT.PostRedisplay();
}
def init
GL.ClearColor(0.0, 0.0, 0.0, 0.0);
GL.ShadeModel(GL::FLAT);
end
reshape = Proc.new {|w, h|
GL.Viewport(0, 0, w, h);
GL.MatrixMode(GL::PROJECTION);
GL.LoadIdentity();
GL.Ortho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
GL.MatrixMode(GL::MODELVIEW);
GL.LoadIdentity();
}
mouse = Proc.new {|button, state, x, y|
case button
when GLUT::LEFT_BUTTON
GLUT.IdleFunc($spinDisplay) if (state == GLUT::DOWN)
when GLUT::MIDDLE_BUTTON
GLUT.IdleFunc(nil) if (state == GLUT::DOWN)
end
}
#
# Request double buffer display mode.
# Register mouse input callback functions
#/
GLUT.Init
GLUT.InitDisplayMode(GLUT::DOUBLE | GLUT::RGB);
GLUT.InitWindowSize(250, 250);
GLUT.InitWindowPosition(100, 100);
GLUT.CreateWindow($0);
init();
GLUT.DisplayFunc(display);
GLUT.ReshapeFunc(reshape);
GLUT.MouseFunc(mouse);
GLUT.MainLoop();
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