author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`gl` --- *Graphics Library* interface |
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========================================== |
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.. module:: gl |
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:platform: IRIX |
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:synopsis: Functions from the Silicon Graphics Graphics Library. |
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:deprecated: |
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.. deprecated:: 2.6 |
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The :mod:`gl` module has been deprecated for removal in Python 3.0. |
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This module provides access to the Silicon Graphics *Graphics Library*. It is |
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available only on Silicon Graphics machines. |
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.. warning:: |
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Some illegal calls to the GL library cause the Python interpreter to dump core. |
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In particular, the use of most GL calls is unsafe before the first window is |
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opened. |
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The module is too large to document here in its entirety, but the following |
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should help you to get started. The parameter conventions for the C functions |
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are translated to Python as follows: |
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* All (short, long, unsigned) int values are represented by Python integers. |
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* All float and double values are represented by Python floating point numbers. |
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In most cases, Python integers are also allowed. |
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* All arrays are represented by one-dimensional Python lists. In most cases, |
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tuples are also allowed. |
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* All string and character arguments are represented by Python strings, for |
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instance, ``winopen('Hi There!')`` and ``rotate(900, 'z')``. |
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* All (short, long, unsigned) integer arguments or return values that are only |
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used to specify the length of an array argument are omitted. For example, the C |
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call :: |
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lmdef(deftype, index, np, props) |
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is translated to Python as :: |
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lmdef(deftype, index, props) |
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* Output arguments are omitted from the argument list; they are transmitted as |
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function return values instead. If more than one value must be returned, the |
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return value is a tuple. If the C function has both a regular return value (that |
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is not omitted because of the previous rule) and an output argument, the return |
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value comes first in the tuple. Examples: the C call :: |
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getmcolor(i, &red, &green, &blue) |
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is translated to Python as :: |
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red, green, blue = getmcolor(i) |
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The following functions are non-standard or have special argument conventions: |
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.. function:: varray(argument) |
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Equivalent to but faster than a number of ``v3d()`` calls. The *argument* is a |
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list (or tuple) of points. Each point must be a tuple of coordinates ``(x, y, |
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z)`` or ``(x, y)``. The points may be 2- or 3-dimensional but must all have the |
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same dimension. Float and int values may be mixed however. The points are always |
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converted to 3D double precision points by assuming ``z = 0.0`` if necessary (as |
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indicated in the man page), and for each point ``v3d()`` is called. |
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.. XXX the argument-argument added |
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.. function:: nvarray() |
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Equivalent to but faster than a number of ``n3f`` and ``v3f`` calls. The |
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argument is an array (list or tuple) of pairs of normals and points. Each pair |
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is a tuple of a point and a normal for that point. Each point or normal must be |
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a tuple of coordinates ``(x, y, z)``. Three coordinates must be given. Float and |
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int values may be mixed. For each pair, ``n3f()`` is called for the normal, and |
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then ``v3f()`` is called for the point. |
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.. function:: vnarray() |
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Similar to ``nvarray()`` but the pairs have the point first and the normal |
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second. |
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.. function:: nurbssurface(s_k, t_k, ctl, s_ord, t_ord, type) |
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Defines a nurbs surface. The dimensions of ``ctl[][]`` are computed as follows: |
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``[len(s_k) - s_ord]``, ``[len(t_k) - t_ord]``. |
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.. XXX s_k[], t_k[], ctl[][] |
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.. function:: nurbscurve(knots, ctlpoints, order, type) |
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Defines a nurbs curve. The length of ctlpoints is ``len(knots) - order``. |
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.. function:: pwlcurve(points, type) |
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Defines a piecewise-linear curve. *points* is a list of points. *type* must be |
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108 |
``N_ST``. |
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109 |
|
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110 |
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.. function:: pick(n) |
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select(n) |
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113 |
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The only argument to these functions specifies the desired size of the pick or |
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select buffer. |
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116 |
|
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117 |
|
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.. function:: endpick() |
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endselect() |
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120 |
|
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These functions have no arguments. They return a list of integers representing |
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the used part of the pick/select buffer. No method is provided to detect buffer |
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overrun. |
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124 |
|
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Here is a tiny but complete example GL program in Python:: |
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126 |
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import gl, GL, time |
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128 |
|
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def main(): |
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gl.foreground() |
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gl.prefposition(500, 900, 500, 900) |
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w = gl.winopen('CrissCross') |
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gl.ortho2(0.0, 400.0, 0.0, 400.0) |
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gl.color(GL.WHITE) |
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gl.clear() |
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gl.color(GL.RED) |
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gl.bgnline() |
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gl.v2f(0.0, 0.0) |
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gl.v2f(400.0, 400.0) |
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gl.endline() |
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gl.bgnline() |
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gl.v2f(400.0, 0.0) |
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gl.v2f(0.0, 400.0) |
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gl.endline() |
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time.sleep(5) |
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146 |
|
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main() |
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148 |
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149 |
|
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150 |
.. seealso:: |
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151 |
|
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`PyOpenGL: The Python OpenGL Binding <http://pyopengl.sourceforge.net/>`_ |
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.. index:: |
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single: OpenGL |
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single: PyOpenGL |
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156 |
|
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An interface to OpenGL is also available; see information about the **PyOpenGL** |
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project online at http://pyopengl.sourceforge.net/. This may be a better option |
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if support for SGI hardware from before about 1996 is not required. |
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160 |
|
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161 |
|
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:mod:`DEVICE` --- Constants used with the :mod:`gl` module |
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========================================================== |
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164 |
|
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.. module:: DEVICE |
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166 |
:platform: IRIX |
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:synopsis: Constants used with the gl module. |
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:deprecated: |
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169 |
|
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|
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.. deprecated:: 2.6 |
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The :mod:`DEVICE` module has been deprecated for removal in Python 3.0. |
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173 |
|
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174 |
|
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This modules defines the constants used by the Silicon Graphics *Graphics |
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Library* that C programmers find in the header file ``<gl/device.h>``. Read the |
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module source file for details. |
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178 |
|
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179 |
|
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:mod:`GL` --- Constants used with the :mod:`gl` module |
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181 |
====================================================== |
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182 |
|
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183 |
.. module:: GL |
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184 |
:platform: IRIX |
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:synopsis: Constants used with the gl module. |
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186 |
:deprecated: |
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187 |
|
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188 |
|
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189 |
.. deprecated:: 2.6 |
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190 |
The :mod:`GL` module has been deprecated for removal in Python 3.0. |
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191 |
|
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192 |
This module contains constants used by the Silicon Graphics *Graphics Library* |
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from the C header file ``<gl/gl.h>``. Read the module source file for details. |
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194 |