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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# Unpublished-- rights reserved under the copyright laws of the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.
#
# list.c
# This program demonstrates how to make and execute a
# display list. Note that attributes, such as current
# color and matrix, are changed.
require 'opengl'
require 'mathn'
include Gl,Glu,Glut
$listName = 0
def init
$listName = glGenLists(1)
glNewList($listName, GL_COMPILE)
glColor(1.0, 0.0, 0.0) # /* current color red */
glBegin(GL_TRIANGLES)
glVertex(0.0, 0.0)
glVertex(1.0, 0.0)
glVertex(0.0, 1.0)
glEnd()
glTranslate(1.5, 0.0, 0.0) # /* move position */
glEndList()
glShadeModel(GL_FLAT)
end
def drawLine
glBegin(GL_LINES)
glVertex(0.0, 0.5)
glVertex(15.0, 0.5)
glEnd()
end
display = Proc.new do
glClear(GL_COLOR_BUFFER_BIT)
glColor(0.0, 1.0, 0.0) # current color green
for i in (0..9 ) # draw 10 triangles
glCallList($listName)
end
drawLine() # is this line green? NO!
# where is the line drawn?
glutSwapBuffers()
end
reshape = Proc.new do |w, h|
glViewport(0, 0, w, h)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
if (w <= h)
GLU.Ortho2D(0.0, 2.0, -0.5 * h/w, 1.5 * h/w)
else
GLU.Ortho2D(0.0, 2.0 * w/h, -0.5, 1.5)
end
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
end
keyboard = Proc.new do |key, x, y|
case (key)
when ?\e
exit(0)
end
end
# Main Loop
# Open window with initial window size, title bar,
# RGBA display mode, and handle input events.
glutInit
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB)
glutInitWindowSize(650, 100)
glutInitWindowPosition(100, 100)
glutCreateWindow($0)
init()
glutReshapeFunc(reshape)
glutDisplayFunc(display)
glutKeyboardFunc(keyboard)
glutMainLoop()
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