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-\section{Built-in Module \module{gl}}
-\label{module-gl}
-\bimodindex{gl}
-
-This module provides access to the Silicon Graphics
-\emph{Graphics Library}.
-It is available only on Silicon Graphics machines.
-
-\strong{Warning:}
-Some illegal calls to the GL library cause the Python interpreter to dump
-core.
-In particular, the use of most GL calls is unsafe before the first
-window is opened.
-
-The module is too large to document here in its entirety, but the
-following should help you to get started.
-The parameter conventions for the C functions are translated to Python as
-follows:
-
-\begin{itemize}
-\item
-All (short, long, unsigned) int values are represented by Python
-integers.
-\item
-All float and double values are represented by Python floating point
-numbers.
-In most cases, Python integers are also allowed.
-\item
-All arrays are represented by one-dimensional Python lists.
-In most cases, tuples are also allowed.
-\item
-\begin{sloppypar}
-All string and character arguments are represented by Python strings,
-for instance,
-\code{winopen('Hi There!')}
-and
-\code{rotate(900, 'z')}.
-\end{sloppypar}
-\item
-All (short, long, unsigned) integer arguments or return values that are
-only used to specify the length of an array argument are omitted.
-For example, the C call
-
-\begin{verbatim}
-lmdef(deftype, index, np, props)
-\end{verbatim}
-%
-is translated to Python as
-
-\begin{verbatim}
-lmdef(deftype, index, props)
-\end{verbatim}
-%
-\item
-Output arguments are omitted from the argument list; they are
-transmitted as function return values instead.
-If more than one value must be returned, the return value is a tuple.
-If the C function has both a regular return value (that is not omitted
-because of the previous rule) and an output argument, the return value
-comes first in the tuple.
-Examples: the C call
-
-\begin{verbatim}
-getmcolor(i, &red, &green, &blue)
-\end{verbatim}
-%
-is translated to Python as
-
-\begin{verbatim}
-red, green, blue = getmcolor(i)
-\end{verbatim}
-%
-\end{itemize}
-
-The following functions are non-standard or have special argument
-conventions:
-
-\begin{funcdesc}{varray}{argument}
-%JHXXX the argument-argument added
-Equivalent to but faster than a number of
-\code{v3d()}
-calls.
-The \var{argument} is a list (or tuple) of points.
-Each point must be a tuple of coordinates
-\code{(\var{x}, \var{y}, \var{z})} or \code{(\var{x}, \var{y})}.
-The points may be 2- or 3-dimensional but must all have the
-same dimension.
-Float and int values may be mixed however.
-The points are always converted to 3D double precision points
-by assuming \code{\var{z} = 0.0} if necessary (as indicated in the man page),
-and for each point
-\code{v3d()}
-is called.
-\end{funcdesc}
-
-\begin{funcdesc}{nvarray}{}
-Equivalent to but faster than a number of
-\code{n3f}
-and
-\code{v3f}
-calls.
-The argument is an array (list or tuple) of pairs of normals and points.
-Each pair is a tuple of a point and a normal for that point.
-Each point or normal must be a tuple of coordinates
-\code{(\var{x}, \var{y}, \var{z})}.
-Three coordinates must be given.
-Float and int values may be mixed.
-For each pair,
-\code{n3f()}
-is called for the normal, and then
-\code{v3f()}
-is called for the point.
-\end{funcdesc}
-
-\begin{funcdesc}{vnarray}{}
-Similar to 
-\code{nvarray()}
-but the pairs have the point first and the normal second.
-\end{funcdesc}
-
-\begin{funcdesc}{nurbssurface}{s_k, t_k, ctl, s_ord, t_ord, type}
-% XXX s_k[], t_k[], ctl[][]
-Defines a nurbs surface.
-The dimensions of
-\code{\var{ctl}[][]}
-are computed as follows:
-\code{[len(\var{s_k}) - \var{s_ord}]},
-\code{[len(\var{t_k}) - \var{t_ord}]}.
-\end{funcdesc}
-
-\begin{funcdesc}{nurbscurve}{knots, ctlpoints, order, type}
-Defines a nurbs curve.
-The length of ctlpoints is
-\code{len(\var{knots}) - \var{order}}.
-\end{funcdesc}
-
-\begin{funcdesc}{pwlcurve}{points, type}
-Defines a piecewise-linear curve.
-\var{points}
-is a list of points.
-\var{type}
-must be
-\code{N_ST}.
-\end{funcdesc}
-
-\begin{funcdesc}{pick}{n}
-\funcline{select}{n}
-The only argument to these functions specifies the desired size of the
-pick or select buffer.
-\end{funcdesc}
-
-\begin{funcdesc}{endpick}{}
-\funcline{endselect}{}
-These functions have no arguments.
-They return a list of integers representing the used part of the
-pick/select buffer.
-No method is provided to detect buffer overrun.
-\end{funcdesc}
-
-Here is a tiny but complete example GL program in Python:
-
-\begin{verbatim}
-import gl, GL, time
-
-def main():
-    gl.foreground()
-    gl.prefposition(500, 900, 500, 900)
-    w = gl.winopen('CrissCross')
-    gl.ortho2(0.0, 400.0, 0.0, 400.0)
-    gl.color(GL.WHITE)
-    gl.clear()
-    gl.color(GL.RED)
-    gl.bgnline()
-    gl.v2f(0.0, 0.0)
-    gl.v2f(400.0, 400.0)
-    gl.endline()
-    gl.bgnline()
-    gl.v2f(400.0, 0.0)
-    gl.v2f(0.0, 400.0)
-    gl.endline()
-    time.sleep(5)
-
-main()
-\end{verbatim}
-%
-\section{Standard Modules \module{GL} and \module{DEVICE}}
-\nodename{GL and DEVICE}
-\stmodindex{GL}
-\stmodindex{DEVICE}
-
-These modules define the constants used by the Silicon Graphics
-\emph{Graphics Library}
-that C programmers find in the header files
-\file{<gl/gl.h>}
-and
-\file{<gl/device.h>}.
-Read the module source files for details.