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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 4d28b655b728
children 3468ea8645ca
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1 \section{Built-in Module \sectcode{gl}}
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2 \bimodindex{gl}
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3
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4 This module provides access to the Silicon Graphics
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5 {\em Graphics Library}.
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6 It is available only on Silicon Graphics machines.
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7
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8 \strong{Warning:}
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9 Some illegal calls to the GL library cause the Python interpreter to dump
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10 core.
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11 In particular, the use of most GL calls is unsafe before the first
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12 window is opened.
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13
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14 The module is too large to document here in its entirety, but the
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15 following should help you to get started.
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16 The parameter conventions for the C functions are translated to Python as
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17 follows:
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18
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19 \begin{itemize}
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20 \item
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21 All (short, long, unsigned) int values are represented by Python
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22 integers.
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23 \item
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24 All float and double values are represented by Python floating point
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25 numbers.
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26 In most cases, Python integers are also allowed.
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27 \item
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28 All arrays are represented by one-dimensional Python lists.
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29 In most cases, tuples are also allowed.
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30 \item
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31 \begin{sloppypar}
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32 All string and character arguments are represented by Python strings,
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33 for instance,
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34 \code{winopen('Hi There!')}
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35 and
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36 \code{rotate(900, 'z')}.
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37 \end{sloppypar}
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38 \item
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39 All (short, long, unsigned) integer arguments or return values that are
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40 only used to specify the length of an array argument are omitted.
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41 For example, the C call
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42
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43 \bcode\begin{verbatim}
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44 lmdef(deftype, index, np, props)
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45 \end{verbatim}\ecode
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46
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47 is translated to Python as
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48
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49 \bcode\begin{verbatim}
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50 lmdef(deftype, index, props)
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51 \end{verbatim}\ecode
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52
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53 \item
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54 Output arguments are omitted from the argument list; they are
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55 transmitted as function return values instead.
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56 If more than one value must be returned, the return value is a tuple.
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57 If the C function has both a regular return value (that is not omitted
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58 because of the previous rule) and an output argument, the return value
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59 comes first in the tuple.
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60 Examples: the C call
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61
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62 \bcode\begin{verbatim}
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63 getmcolor(i, &red, &green, &blue)
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64 \end{verbatim}\ecode
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65
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66 is translated to Python as
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67
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68 \bcode\begin{verbatim}
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69 red, green, blue = getmcolor(i)
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70 \end{verbatim}\ecode
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71
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72 \end{itemize}
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73
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74 The following functions are non-standard or have special argument
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75 conventions:
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76
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77 \renewcommand{\indexsubitem}{(in module gl)}
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78 \begin{funcdesc}{varray}{argument}
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79 %JHXXX the argument-argument added
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80 Equivalent to but faster than a number of
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81 \code{v3d()}
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82 calls.
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83 The \var{argument} is a list (or tuple) of points.
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84 Each point must be a tuple of coordinates
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85 \code{(\var{x}, \var{y}, \var{z})} or \code{(\var{x}, \var{y})}.
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86 The points may be 2- or 3-dimensional but must all have the
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87 same dimension.
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88 Float and int values may be mixed however.
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89 The points are always converted to 3D double precision points
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90 by assuming \code{\var{z} = 0.0} if necessary (as indicated in the man page),
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91 and for each point
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92 \code{v3d()}
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93 is called.
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94 \end{funcdesc}
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95
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96 \begin{funcdesc}{nvarray}{}
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97 Equivalent to but faster than a number of
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98 \code{n3f}
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99 and
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100 \code{v3f}
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101 calls.
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102 The argument is an array (list or tuple) of pairs of normals and points.
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103 Each pair is a tuple of a point and a normal for that point.
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104 Each point or normal must be a tuple of coordinates
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105 \code{(\var{x}, \var{y}, \var{z})}.
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106 Three coordinates must be given.
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107 Float and int values may be mixed.
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108 For each pair,
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109 \code{n3f()}
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110 is called for the normal, and then
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111 \code{v3f()}
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112 is called for the point.
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113 \end{funcdesc}
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114
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115 \begin{funcdesc}{vnarray}{}
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116 Similar to
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117 \code{nvarray()}
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118 but the pairs have the point first and the normal second.
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119 \end{funcdesc}
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120
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121 \begin{funcdesc}{nurbssurface}{s_k\, t_k\, ctl\, s_ord\, t_ord\, type}
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122 % XXX s_k[], t_k[], ctl[][]
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123 %\itembreak
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124 Defines a nurbs surface.
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125 The dimensions of
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126 \code{\var{ctl}[][]}
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127 are computed as follows:
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128 \code{[len(\var{s_k}) - \var{s_ord}]},
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129 \code{[len(\var{t_k}) - \var{t_ord}]}.
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130 \end{funcdesc}
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131
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132 \begin{funcdesc}{nurbscurve}{knots\, ctlpoints\, order\, type}
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133 Defines a nurbs curve.
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134 The length of ctlpoints is
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135 \code{len(\var{knots}) - \var{order}}.
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136 \end{funcdesc}
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137
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138 \begin{funcdesc}{pwlcurve}{points\, type}
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139 Defines a piecewise-linear curve.
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140 \var{points}
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141 is a list of points.
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142 \var{type}
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143 must be
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144 \code{N_ST}.
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145 \end{funcdesc}
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146
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147 \begin{funcdesc}{pick}{n}
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148 \funcline{select}{n}
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149 The only argument to these functions specifies the desired size of the
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150 pick or select buffer.
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151 \end{funcdesc}
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152
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153 \begin{funcdesc}{endpick}{}
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154 \funcline{endselect}{}
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155 These functions have no arguments.
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156 They return a list of integers representing the used part of the
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157 pick/select buffer.
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158 No method is provided to detect buffer overrun.
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159 \end{funcdesc}
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160
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161 Here is a tiny but complete example GL program in Python:
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162
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163 \bcode\begin{verbatim}
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164 import gl, GL, time
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165
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166 def main():
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167 gl.foreground()
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168 gl.prefposition(500, 900, 500, 900)
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169 w = gl.winopen('CrissCross')
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170 gl.ortho2(0.0, 400.0, 0.0, 400.0)
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171 gl.color(GL.WHITE)
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172 gl.clear()
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173 gl.color(GL.RED)
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174 gl.bgnline()
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175 gl.v2f(0.0, 0.0)
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176 gl.v2f(400.0, 400.0)
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177 gl.endline()
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178 gl.bgnline()
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179 gl.v2f(400.0, 0.0)
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180 gl.v2f(0.0, 400.0)
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181 gl.endline()
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182 time.sleep(5)
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183
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184 main()
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185 \end{verbatim}\ecode
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186
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187 \section{Standard Modules \sectcode{GL} and \sectcode{DEVICE}}
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188 \nodename{GL and DEVICE}
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189 \stmodindex{GL}
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190 \stmodindex{DEVICE}
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191
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192 These modules define the constants used by the Silicon Graphics
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193 {\em Graphics Library}
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194 that C programmers find in the header files
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195 \file{<gl/gl.h>}
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196 and
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197 \file{<gl/device.h>}.
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198 Read the module source files for details.