/usr/share/doc/ruby-opengl/examples/RedBook/aapoly.rb is in ruby-opengl 0.60.1+dfsg2-1~wheezy1.
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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# Unpublished-- rights reserved under the copyright laws of the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.
#
# 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 'opengl'
include Gl,Glu,Glut
$polySmooth = true
def init
glCullFace(GL_BACK)
glEnable(GL_CULL_FACE)
glBlendFunc(GL_SRC_ALPHA_SATURATE, GL_ONE)
glClearColor(0.0, 0.0, 0.0, 0.0)
end
NFACE=6
NVERT=8
$indices = [
[4, 5, 6, 7], [2, 3, 7, 6], [0, 4, 7, 3],
[0, 1, 5, 4], [1, 5, 6, 2], [0, 3, 2, 1]
]
def drawCube(x0, x1, y0, y1, z0, z1)
v = [[],[],[],[],[],[],[],[]]
c = [
[0.0, 0.0, 0.0, 1.0], [1.0, 0.0, 0.0, 1.0],
[0.0, 1.0, 0.0, 1.0], [1.0, 1.0, 0.0, 1.0],
[0.0, 0.0, 1.0, 1.0], [1.0, 0.0, 1.0, 1.0],
[0.0, 1.0, 1.0, 1.0], [1.0, 1.0, 1.0, 1.0]
]
# indices of front, top, left, bottom, right, back faces
v[0][0] = v[3][0] = v[4][0] = v[7][0] = x0
v[1][0] = v[2][0] = v[5][0] = v[6][0] = x1
v[0][1] = v[1][1] = v[4][1] = v[5][1] = y0
v[2][1] = v[3][1] = v[6][1] = v[7][1] = y1
v[0][2] = v[1][2] = v[2][2] = v[3][2] = z0
v[4][2] = v[5][2] = v[6][2] = v[7][2] = z1
glEnableClientState(GL_VERTEX_ARRAY)
glEnableClientState(GL_COLOR_ARRAY)
glVertexPointer(3, GL_FLOAT, 0, v.flatten!.pack("f*"))
glColorPointer(4, GL_FLOAT, 0, c.flatten!.pack("f*"))
glDrawElements(GL_QUADS, NFACE*4, GL_UNSIGNED_BYTE, $indices.flatten.pack("C*"))
glDisableClientState(GL_VERTEX_ARRAY)
glDisableClientState(GL_COLOR_ARRAY)
end
# Note: polygons must be drawn from front to back
# for proper blending.
display = proc do
if ($polySmooth)
glClear(GL_COLOR_BUFFER_BIT)
glEnable(GL_BLEND)
glEnable(GL_POLYGON_SMOOTH)
glDisable(GL_DEPTH_TEST)
else
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glDisable(GL_BLEND)
glDisable(GL_POLYGON_SMOOTH)
glEnable(GL_DEPTH_TEST)
end
glPushMatrix()
glTranslate(0.0, 0.0, -8.0)
glRotate(30.0, 1.0, 0.0, 0.0)
glRotate(60.0, 0.0, 1.0, 0.0)
drawCube(-0.5, 0.5, -0.5, 0.5, -0.5, 0.5)
glPopMatrix()
glutSwapBuffers()
end
reshape = proc do |w, h|
glViewport(0, 0, w, h)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(30.0, w.to_f/ h.to_f, 1.0, 20.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
end
keyboard = proc do |key, x, y|
case (key)
when ?t ,?T
$polySmooth = !$polySmooth
glutPostRedisplay()
when ?\e
exit(0) # Escape key
end
end
# Main Loop
glutInit
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_ALPHA | GLUT_DEPTH)
glutInitWindowSize(500, 500)
glutInitWindowPosition(100, 100)
glutCreateWindow($0)
init()
glutReshapeFunc(reshape)
glutKeyboardFunc(keyboard)
glutDisplayFunc(display)
glutMainLoop()
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