mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-25 04:46:27 -05:00
273 lines
11 KiB
HTML
273 lines
11 KiB
HTML
|
<!-- begin header.html -->
|
||
|
|
<!--
|
||
|
|
The OpenGL Extension Wrangler Library
|
||
|
|
Copyright (C) 2002-2008, Milan Ikits <milan ikits[]ieee org>
|
||
|
|
Copyright (C) 2002-2008, Marcelo E. Magallon <mmagallo[]debian org>
|
||
|
|
Copyright (C) 2002, Lev Povalahev
|
||
|
|
All rights reserved.
|
||
|
|
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions are met:
|
||
|
|
|
||
|
|
* Redistributions of source code must retain the above copyright notice,
|
||
|
|
this list of conditions and the following disclaimer.
|
||
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
||
|
|
this list of conditions and the following disclaimer in the documentation
|
||
|
|
and/or other materials provided with the distribution.
|
||
|
|
* The name of the author may be used to endorse or promote products
|
||
|
|
derived from this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
|
||
|
|
THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
-->
|
||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html/4/loose.dtd">
|
||
|
|
<!-- <img src="new.png" height="12" alt="NEW!"> -->
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<title>GLEW: The OpenGL Extension Wrangler Library</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
|
||
|
|
<link href="glew.css" type="text/css" rel="stylesheet">
|
||
|
|
</head>
|
||
|
|
<body bgcolor="#fff0d0">
|
||
|
|
<table border="0" width="100%" cellpadding="12" cellspacing="8" style="height:100%">
|
||
|
|
<tr>
|
||
|
|
<td bgcolor="#ffffff" align="left" valign="top" width="200">
|
||
|
|
<table border="0" width="100%" cellpadding="0" cellspacing="0" align="left">
|
||
|
|
<tr>
|
||
|
|
<td valign="top">
|
||
|
|
|
||
|
|
<table border="0" width="100%" cellpadding="0" cellspacing="0" align="left">
|
||
|
|
<tr><td align="center"><i>Latest Release: <a href="https://sourceforge.net/projects/glew/files/glew/1.10.0/">1.10.0</a></i></td></tr>
|
||
|
|
<tr><td align="center"><br></td></tr>
|
||
|
|
<tr><td align="center"><img src="./glew.png" alt="GLEW Logo" width="97" height="75"></td></tr>
|
||
|
|
<tr><td align="center"><br></td></tr>
|
||
|
|
<tr><td align="center">
|
||
|
|
<table border="0" cellpadding="0" cellspacing="0" align="center">
|
||
|
|
<tr><td align="center"><a href="index.html">Download</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="basic.html">Usage</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="build.html">Building</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="install.html">Installation</a></td></tr>
|
||
|
|
<tr><td align="center">Source Generation</td></tr>
|
||
|
|
<tr><td align="center"><a href="credits.html">Credits & Copyright</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="log.html">Change Log</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="https://sourceforge.net/projects/glew">Project Page</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="https://sourceforge.net/p/glew/mailman">Mailing Lists</a></td></tr>
|
||
|
|
<tr><td align="center"><a href="https://sourceforge.net/p/glew/_list/tickets">Bug Tracker</a></td></tr>
|
||
|
|
</table>
|
||
|
|
<tr><td align="center"><br></tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<tr>
|
||
|
|
|
||
|
|
<td valign="bottom">
|
||
|
|
<table border="0" width="100%" cellpadding="5" cellspacing="0" align="left">
|
||
|
|
<tr><td align="center"><i>Last Update: 07-22-13</i></td></tr>
|
||
|
|
<tr><td align="center">
|
||
|
|
<a href="http://www.opengl.org"> <img src="./ogl_sm.jpg" width="68"
|
||
|
|
height="35" border="0" alt="OpenGL Logo"></a>
|
||
|
|
<a href="http://sourceforge.net"> <img
|
||
|
|
src="http://sourceforge.net/sflogo.php?group_id=67586&type=1"
|
||
|
|
width="88" height="31" border="0" alt="SourceForge Logo"></a>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
<!--- <tr><td align="center"><a
|
||
|
|
href="http://sourceforge.net/donate/index.php?group_id=67586"><img
|
||
|
|
src="http://images.sourceforge.net/images/project-support.jpg"
|
||
|
|
width="88" height="32" border="0" alt="Support This Project"></a></td></tr> -->
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
</tr>
|
||
|
|
</table>
|
||
|
|
</td>
|
||
|
|
|
||
|
|
<td bgcolor="#ffffff" align="left" valign="top">
|
||
|
|
|
||
|
|
<h1>The OpenGL Extension Wrangler Library</h1>
|
||
|
|
|
||
|
|
<!-- end header.html -->
|
||
|
|
|
||
|
|
|
||
|
|
<h2>Automatic Code Generation</h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Starting from release 1.1.0, the source code and parts of the
|
||
|
|
documentation are automatically generated from the extension
|
||
|
|
specifications in a two-step process. In the first step,
|
||
|
|
specification files from the OpenGL registry are downloaded and
|
||
|
|
parsed. Skeleton descriptors are created for each extension. These
|
||
|
|
descriptors contain all necessary information for creating the source
|
||
|
|
code and documentation in a simple and compact format, including the
|
||
|
|
name of the extension, url link to the specification, tokens, function
|
||
|
|
declarations, typedefs and struct definitions. In the second step,
|
||
|
|
the header files as well as the library and glewinfo source are
|
||
|
|
generated from the descriptor files. The code generation scripts are
|
||
|
|
located in the <tt>auto</tt> subdirectory.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
The code generation scripts require GNU make, wget, and perl. On
|
||
|
|
Windows, the simplest way to get access to these tools is to install
|
||
|
|
<a href="http://www.cygwin.com/">Cygwin</a>, but make sure that the
|
||
|
|
root directory is mounted in binary mode. The makefile in the
|
||
|
|
<tt>auto</tt> directory provides the following build targets:
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<table border=0 cellpadding=0 cellspacing=5>
|
||
|
|
<tr><td align="left" valign="top"><tt>make</tt></td>
|
||
|
|
<td align=left>Create the source files from the descriptors.<br/> If the
|
||
|
|
descriptors do not exist, create them from the spec files.<br/> If the spec
|
||
|
|
files do not exist, download them from the OpenGL repository.</td></tr>
|
||
|
|
<tr><td align="left" valign="top"><tt>make clean</tt></td>
|
||
|
|
<td align=left>Delete the source files.</td></tr>
|
||
|
|
<tr><td align="left" valign="top"><tt>make clobber</tt></td>
|
||
|
|
<td align=left>Delete the source files and the descriptors.</td></tr>
|
||
|
|
<tr><td align="left" valign="top"><tt>make destroy</tt></td>
|
||
|
|
<td align=left>Delete the source files, the descriptors, and the spec files.</td></tr>
|
||
|
|
<tr><td align="left" valign="top"><tt>make custom</tt></td>
|
||
|
|
<td align=left>Create the source files for the extensions
|
||
|
|
listed in <tt>auto/custom.txt</tt>.<br/> See "Custom Code
|
||
|
|
Generation" below for more details.</td></tr>
|
||
|
|
</table>
|
||
|
|
|
||
|
|
<h3>Adding a New Extension</h3>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
To add a new extension, create a descriptor file for the extension in
|
||
|
|
<tt>auto/core</tt> and rerun the code generation scripts by typing
|
||
|
|
<tt>make clean; make</tt> in the <tt>auto</tt> directory.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
The format of the descriptor file is given below. Items in
|
||
|
|
brackets are optional.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p class="pre">
|
||
|
|
<Extension Name><br>
|
||
|
|
[<URL of Specification File>]<br>
|
||
|
|
[<Token Name> <Token Value>]<br>
|
||
|
|
[<Token Name> <Token Value>]<br>
|
||
|
|
...<br>
|
||
|
|
[<Typedef>]<br>
|
||
|
|
[<Typedef>]<br>
|
||
|
|
...<br>
|
||
|
|
[<Function Signature>]<br>
|
||
|
|
[<Function Signature>]<br>
|
||
|
|
...<br>
|
||
|
|
<!-- [<Function Definition>]<br>
|
||
|
|
[<Function Definition>]<br>
|
||
|
|
...<br> -->
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<!--
|
||
|
|
<p>
|
||
|
|
Note that <tt>Function Definitions</tt> are copied to the header files
|
||
|
|
without changes and have to be terminated with a semicolon. In
|
||
|
|
contrast, <tt>Tokens</tt>, <tt>Function signatures</tt>, and
|
||
|
|
<tt>Typedefs</tt> should not be terminated with a semicolon.
|
||
|
|
</p>
|
||
|
|
-->
|
||
|
|
|
||
|
|
<p>
|
||
|
|
Take a look at one of the files in <tt>auto/core</tt> for an
|
||
|
|
example. Note that typedefs and function signatures should not be
|
||
|
|
terminated with a semicolon.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h3>Custom Code Generation</h3>
|
||
|
|
<p>
|
||
|
|
Starting from GLEW 1.3.0, it is possible to control which extensions
|
||
|
|
to include in the libarary by specifying a list in
|
||
|
|
<tt>auto/custom.txt</tt>. This is useful when you do not need all the
|
||
|
|
extensions and would like to reduce the size of the source files.
|
||
|
|
Type <tt>make clean; make custom</tt> in the <tt>auto</tt> directory
|
||
|
|
to rerun the scripts with the custom list of extensions.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
For example, the following is the list of extensions needed to get GLEW and the
|
||
|
|
utilities to compile.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<p class="pre">
|
||
|
|
WGL_ARB_extensions_string<br>
|
||
|
|
WGL_ARB_multisample<br>
|
||
|
|
WGL_ARB_pixel_format<br>
|
||
|
|
WGL_ARB_pbuffer<br>
|
||
|
|
WGL_EXT_extensions_string<br>
|
||
|
|
WGL_ATI_pixel_format_float<br>
|
||
|
|
WGL_NV_float_buffer<br>
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Multiple Rendering Contexts (GLEW MX)</h2>
|
||
|
|
|
||
|
|
<p>Starting with release 1.2.0, thread-safe support for multiple
|
||
|
|
rendering contexts, possibly with different capabilities, is
|
||
|
|
available. Since this is not required by most users, it is not added
|
||
|
|
to the binary releases to maintain compatibility between different
|
||
|
|
versions. To include multi-context support, you have to do the
|
||
|
|
following:</p>
|
||
|
|
<ol>
|
||
|
|
<li>Compile and use GLEW with the <tt>GLEW_MX</tt> preprocessor token
|
||
|
|
defined.</li>
|
||
|
|
<li>For each rendering context, create a <tt>GLEWContext</tt> object
|
||
|
|
that will be available as long as the rendering context exists.</li>
|
||
|
|
<li>Define a macro or function called <tt>glewGetContext()</tt> that
|
||
|
|
returns a pointer to the <tt>GLEWContext</tt> object associated with
|
||
|
|
the rendering context from which OpenGL/WGL/GLX calls are issued. This
|
||
|
|
dispatch mechanism is primitive, but generic.
|
||
|
|
<li>Make sure that you call <tt>glewInit()</tt> after creating the
|
||
|
|
<tt>GLEWContext</tt> object in each rendering context. Note, that the
|
||
|
|
<tt>GLEWContext</tt> pointer returned by <tt>glewGetContext()</tt> has
|
||
|
|
to reside in global or thread-local memory.
|
||
|
|
</ol>
|
||
|
|
|
||
|
|
<p>Note that according to the <a
|
||
|
|
href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/opengl/ntopnglr_6yer.asp">MSDN
|
||
|
|
WGL documentation</a>, you have to initialize the entry points for
|
||
|
|
every rendering context that use pixel formats with different
|
||
|
|
capabilities For example, the pixel formats provided by the generic
|
||
|
|
software OpenGL implementation by Microsoft vs. the hardware
|
||
|
|
accelerated pixel formats have different capabilities. <b>GLEW by
|
||
|
|
default ignores this requirement, and does not define per-context
|
||
|
|
entry points (you can however do this using the steps described
|
||
|
|
above).</b> Assuming a global namespace for the entry points works in
|
||
|
|
most situations, because typically all hardware accelerated pixel
|
||
|
|
formats provide the same entry points and capabilities. This means
|
||
|
|
that unless you use the multi-context version of GLEW, you need to
|
||
|
|
call <tt>glewInit()</tt> only once in your program, or more precisely,
|
||
|
|
once per process.</p>
|
||
|
|
|
||
|
|
<h2>Separate Namespace</h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
To avoid name clashes when linking with libraries that include the
|
||
|
|
same symbols, extension entry points are declared in a separate
|
||
|
|
namespace (release 1.1.0 and up). This is achieved by aliasing OpenGL
|
||
|
|
function names to their GLEW equivalents. For instance,
|
||
|
|
<tt>glFancyFunction</tt> is simply an alias to
|
||
|
|
<tt>glewFancyFunction</tt>. The separate namespace does not effect
|
||
|
|
token and function pointer definitions.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<h2>Known Issues</h2>
|
||
|
|
|
||
|
|
<p>
|
||
|
|
GLEW requires GLX 1.2 for compatibility with GLUT.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
<!-- begin footer.html -->
|
||
|
|
</td></tr></table></body>
|
||
|
|
<!-- end footer.html -->
|
||
|
|
|