1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
#
# 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# Unpublished-- rights reserved under the copyright laws of the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.
#
# accpersp.c
# Use the accumulation buffer to do full-scene antialiasing
# on a scene with perspective projection, using the special
# routines accFrustum() and accPerspective().
require 'opengl'
include Gl,Glu,Glut
$j8 = [
[-0.334818, 0.435331],
[ 0.286438, -0.393495],
[ 0.459462, 0.141540],
[-0.414498, -0.192829],
[-0.183790, 0.082102],
[-0.079263, -0.317383],
[ 0.102254, 0.299133],
[ 0.164216, -0.054399]
]
# accFrustum()
# The first 6 arguments are identical to the glFrustum() call.
#
# pixdx and pixdy are anti-alias jitter in pixels.
# Set both equal to 0.0 for no anti-alias jitter.
# eyedx and eyedy are depth-of field jitter in pixels.
# Set both equal to 0.0 for no depth of field effects.
#
# focus is distance from eye to plane in focus.
# focus must be greater than, but not equal to 0.0.
#
# Note that accFrustum() calls glTranslatef(). You will
# probably want to insure that your ModelView matrix has been
# initialized to identity before calling accFrustum().
def accFrustum(left, right, bottom, top, nnear, ffar, pixdx, pixdy, eyedx, eyedy, focus)
viewport = glGetDoublev(GL_VIEWPORT)
xwsize = right - left
ywsize = top - bottom
dx = -(pixdx*xwsize/viewport[2] + eyedx*nnear/focus)
dy = -(pixdy*ywsize/viewport[3] + eyedy*nnear/focus)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glFrustum(left + dx, right + dx, bottom + dy, top + dy, nnear, ffar)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
glTranslate(-eyedx, -eyedy, 0.0)
end
# accPerspective()
#
# The first 4 arguments are identical to the gluPerspective() call.
# pixdx and pixdy are anti-alias jitter in pixels.
# Set both equal to 0.0 for no anti-alias jitter.
# eyedx and eyedy are depth-of field jitter in pixels.
# Set both equal to 0.0 for no depth of field effects.
#
# focus is distance from eye to plane in focus.
# focus must be greater than, but not equal to 0.0.
#
# Note that accPerspective() calls accFrustum().
def accPerspective(fovy, aspect, nnear, ffar, pixdx, pixdy, eyedx, eyedy, focus)
fov2 = ((fovy*Math::PI) / 180.0) / 2.0
top = nnear / (Math::cos(fov2) / Math::sin(fov2))
bottom = -top
right = top * aspect
left = -right
accFrustum(left, right, bottom, top, nnear, ffar, pixdx, pixdy, eyedx, eyedy, focus)
end
# Initialize lighting and other values.
def init
mat_ambient = [ 1.0, 1.0, 1.0, 1.0 ]
mat_specular = [ 1.0, 1.0, 1.0, 1.0 ]
light_position = [ 0.0, 0.0, 10.0, 1.0 ]
lm_ambient = [ 0.2, 0.2, 0.2, 1.0 ]
glMaterial(GL_FRONT, GL_AMBIENT, mat_ambient)
glMaterial(GL_FRONT, GL_SPECULAR, mat_specular)
glMaterial(GL_FRONT, GL_SHININESS, 50.0)
glLight(GL_LIGHT0, GL_POSITION, light_position)
glLightModel(GL_LIGHT_MODEL_AMBIENT, lm_ambient)
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_DEPTH_TEST)
glShadeModel(GL_FLAT)
glClearColor(0.0, 0.0, 0.0, 0.0)
glClearAccum(0.0, 0.0, 0.0, 0.0)
end
def displayObjects
torus_diffuse = [ 0.7, 0.7, 0.0, 1.0 ]
cube_diffuse = [ 0.0, 0.7, 0.7, 1.0 ]
sphere_diffuse = [ 0.7, 0.0, 0.7, 1.0 ]
octa_diffuse = [ 0.7, 0.4, 0.4, 1.0 ]
glPushMatrix()
glTranslate(0.0, 0.0, -5.0)
glRotate(30.0, 1.0, 0.0, 0.0)
glPushMatrix()
glTranslate(-0.80, 0.35, 0.0)
glRotate(100.0, 1.0, 0.0, 0.0)
glMaterial(GL_FRONT, GL_DIFFUSE, torus_diffuse)
glutSolidTorus(0.275, 0.85, 16, 16)
glPopMatrix()
glPushMatrix()
glTranslate(-0.75, -0.50, 0.0)
glRotate(45.0, 0.0, 0.0, 1.0)
glRotate(45.0, 1.0, 0.0, 0.0)
glMaterial(GL_FRONT, GL_DIFFUSE, cube_diffuse)
glutSolidCube(1.5)
glPopMatrix()
glPushMatrix()
glTranslate(0.75, 0.60, 0.0)
glRotate(30.0, 1.0, 0.0, 0.0)
glMaterial(GL_FRONT, GL_DIFFUSE, sphere_diffuse)
glutSolidSphere(1.0, 16, 16)
glPopMatrix()
glPushMatrix()
glTranslate(0.70, -0.90, 0.25)
glMaterial(GL_FRONT, GL_DIFFUSE, octa_diffuse)
glutSolidOctahedron()
glPopMatrix()
glPopMatrix()
end
ACSIZE=8
display = proc do
viewport = glGetDoublev(GL_VIEWPORT)
glClear(GL_ACCUM_BUFFER_BIT)
for jitter in 0...ACSIZE
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
accPerspective(50.0, viewport[2]/ viewport[3], 1.0, 15.0, $j8[jitter][0], $j8[jitter][1], 0.0, 0.0, 1.0)
displayObjects()
glAccum(GL_ACCUM, 1.0/ACSIZE)
end
glAccum(GL_RETURN, 1.0)
glutSwapBuffers()
end
reshape = proc do |w, h|
glViewport(0, 0, w, h)
end
keyboard = proc do |key, x, y|
case (key)
when ?\e
exit(0)
end
end
# Main Loop
# Be certain you request an accumulation buffer.
glutInit()
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_ACCUM | GLUT_DEPTH)
glutInitWindowSize(500, 500)
glutInitWindowPosition(100, 100)
glutCreateWindow($0)
init()
glutReshapeFunc(reshape)
glutDisplayFunc(display)
glutKeyboardFunc(keyboard)
glutMainLoop()
|
