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+# GLEW - The OpenGL Extension Wrangler Library
+
+The OpenGL Extension Wrangler Library (GLEW) is a cross-platform open-source C/C++ extension loading library. GLEW provides efficient run-time mechanisms for determining which OpenGL extensions are supported on the target platform. OpenGL core and extension functionality is exposed in a single header file. GLEW has been tested on a variety of operating systems, including Windows, Linux, Mac OS X, FreeBSD, Irix, and Solaris.
+
+![](http://glew.sourceforge.net/glew.png)
+
+http://glew.sourceforge.net/
+
+https://github.com/nigels-com/glew
+
+[![Gitter](https://badges.gitter.im/nigels-com/glew.svg)](https://gitter.im/nigels-com/glew?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+[![Download](https://img.shields.io/sourceforge/dm/glew.svg)](https://sourceforge.net/projects/glew/files/latest/download)
+
+## Table of Contents
+
+* [Downloads](#downloads)
+	* [Recent snapshots](#recent-snapshots)
+* [Build](#build)
+	* [Linux and Mac](#linux-and-mac)
+		* [Using GNU Make](#using-gnu-make)
+		* [Install build tools](#install-build-tools)
+		* [Build](#build-1)
+		* [Linux EGL](#linux-egl)
+		* [Linux OSMesa](#linux-osmesa)
+		* [Linux mingw-w64](#linux-mingw-w64)
+	* [Using cmake](#using-cmake)
+		* [Install build tools](#install-build-tools-1)
+		* [Build](#build-2)
+	* [Windows](#windows)
+		* [Visual Studio](#visual-studio)
+		* [MSYS/Mingw](#msysmingw)
+		* [MSYS2/Mingw-w64](#msys2mingw-w64)
+* [glewinfo](#glewinfo)
+* [Code Generation](#code-generation)
+* [Authors](#authors)
+* [Contributions](#contributions)
+* [Copyright and Licensing](#copyright-and-licensing)
+
+## Downloads
+
+Current release is [2.2.0](https://github.com/nigels-com/glew/releases/tag/glew-2.2.0).
+[(Change Log)](http://glew.sourceforge.net/log.html)
+
+Sources available as
+[ZIP](https://github.com/nigels-com/glew/releases/download/glew-2.2.0/glew-2.2.0.zip) or
+[TGZ](https://github.com/nigels-com/glew/releases/download/glew-2.2.0/glew-2.2.0.tgz).
+
+Windows binaries for [32-bit and 64-bit](https://github.com/nigels-com/glew/releases/download/glew-2.2.0/glew-2.2.0-win32.zip).
+
+### Recent snapshots
+
+Snapshots may contain new features, bug-fixes or new OpenGL extensions ahead of tested, official releases.
+
+[glew-20220402.tgz](https://sourceforge.net/projects/glew/files/glew/snapshots/glew-20220402.tgz/download) *GLEW 2.2.0 - with fix for glCreateProgressFenceNVX*
+
+## Build
+
+It is highly recommended to build from a tgz or zip release snapshot.
+The code generation workflow is a complex brew of gnu make, perl and python, that works best on Linux or Mac.
+The code generation is known to work on Windows using [MSYS2](https://www.msys2.org/).
+For most end-users of GLEW the official releases are the best choice, with first class support.
+
+### Linux and Mac
+
+#### Using GNU Make
+
+GNU make is the primary build system for GLEW, historically.
+It includes targets for building the sources and headers, for maintenance purposes.
+
+##### Install build tools
+
+Debian/Ubuntu/Mint:    `$ sudo apt-get install build-essential libxmu-dev libxi-dev libgl-dev`
+
+RedHat/CentOS/Fedora:  `$ sudo yum install libXmu-devel libXi-devel libGL-devel`
+
+FreeBSD: `# pkg install xorg lang/gcc git cmake gmake bash python perl5`
+
+##### Build
+
+	$ make
+	$ sudo make install
+	$ make clean
+
+Targets:    `all, glew.lib (sub-targets: glew.lib.shared, glew.lib.static), glew.bin, clean, install, uninstall`
+
+Variables:  `SYSTEM=linux-clang, GLEW_DEST=/usr/local, STRIP=`
+
+_Note: you may need to call `make` in the  **auto** folder first_
+
+##### Linux EGL
+
+	$ sudo apt install libegl1-mesa-dev
+	$ make SYSTEM=linux-egl
+
+##### Linux OSMesa
+
+	$ sudo apt install libosmesa-dev
+	$ make SYSTEM=linux-osmesa
+
+##### Linux mingw-w64
+
+	$ sudo apt install mingw-w64
+	$ make SYSTEM=linux-mingw32
+	$ make SYSTEM=linux-mingw64
+
+#### Using cmake
+
+The cmake build is mostly contributor maintained.
+Due to the multitude of use cases this is maintained on a _best effort_ basis.
+Pull requests are welcome.
+
+*CMake 2.8.12 or higher is required.*
+
+##### Install build tools
+
+Debian/Ubuntu/Mint:   `$ sudo apt-get install build-essential libxmu-dev libxi-dev libgl-dev cmake git`
+
+RedHat/CentOS/Fedora: `$ sudo yum install libXmu-devel libXi-devel libGL-devel cmake git`
+
+##### Build
+
+	$ cd build
+	$ cmake ./cmake
+	$ make -j4
+
+| Target     | Description |
+| ---------- | ----------- |
+| glew       | Build the glew shared library. |
+| glew_s     | Build the glew static library. |
+| glewinfo   | Build the `glewinfo` executable (requires `BUILD_UTILS` to be `ON`). |
+| visualinfo | Build the `visualinfo` executable (requires `BUILD_UTILS` to be `ON`). |
+| install    | Install all enabled targets into `CMAKE_INSTALL_PREFIX`. |
+| clean      | Clean up build artifacts. |
+| all        | Build all enabled targets (default target). |
+
+| Variables       | Description |
+| --------------- | ----------- |
+| BUILD_UTILS     | Build the `glewinfo` and `visualinfo` executables. |
+| GLEW_REGAL      | Build in Regal mode. |
+| GLEW_OSMESA     | Build in off-screen Mesa mode. |
+| BUILD_FRAMEWORK | Build as MacOSX Framework.  Setting `CMAKE_INSTALL_PREFIX` to `/Library/Frameworks` is recommended. |
+
+### Windows
+
+#### Visual Studio
+
+Use the provided Visual Studio project file in build/vc15/
+
+Projects for vc6, vc10, vc12 and vc14 are also provided
+
+#### MSYS/Mingw
+
+Available from [Mingw](http://www.mingw.org/)
+
+Requirements: bash, make, gcc
+
+	$ mingw32-make
+	$ mingw32-make install
+	$ mingw32-make install.all
+
+Alternative toolchain:  `SYSTEM=mingw-win32`
+
+#### MSYS2/Mingw-w64
+
+Available from [Msys2](http://msys2.github.io/) and/or [Mingw-w64](http://mingw-w64.org/)
+
+Requirements: bash, make, gcc
+
+	$ pacman -S gcc make mingw-w64-i686-gcc mingw-w64-x86_64-gcc
+	$ make
+	$ make install
+	$ make install.all
+
+Alternative toolchain:  `SYSTEM=msys, SYSTEM=msys-win32, SYSTEM=msys-win64`
+
+## glewinfo
+
+`glewinfo` is a command-line tool useful for inspecting the capabilities of an
+OpenGL implementation and GLEW support for that.  Please include `glewinfo.txt`
+with bug reports, as appropriate.
+
+	---------------------------
+	    GLEW Extension Info
+	---------------------------
+
+	GLEW version 2.0.0
+	Reporting capabilities of pixelformat 3
+	Running on a Intel(R) HD Graphics 3000 from Intel
+	OpenGL version 3.1.0 - Build 9.17.10.4229 is supported
+
+	GL_VERSION_1_1:                                                OK
+	---------------
+
+	GL_VERSION_1_2:                                                OK
+	---------------
+	  glCopyTexSubImage3D:                                         OK
+	  glDrawRangeElements:                                         OK
+	  glTexImage3D:                                                OK
+	  glTexSubImage3D:                                             OK
+
+	...
+
+## Code Generation
+
+A Unix or Mac environment is needed for building GLEW from scratch to
+include new extensions, or customize the code generation. The extension
+data is regenerated from the top level source directory with:
+
+	make extensions
+
+An alternative to generating the GLEW sources from scratch is to
+download a pre-generated (unsupported) snapshot:
+
+https://sourceforge.net/projects/glew/files/glew/snapshots/
+
+## Authors
+
+GLEW is currently maintained by [Nigel Stewart](https://github.com/nigels-com)
+with bug fixes, new OpenGL extension support and new releases.
+
+GLEW was developed by [Milan Ikits](http://www.cs.utah.edu/~ikits/)
+and [Marcelo Magallon](http://wwwvis.informatik.uni-stuttgart.de/~magallon/).
+Aaron Lefohn, Joe Kniss, and Chris Wyman were the first users and also
+assisted with the design and debugging process.
+
+The acronym GLEW originates from Aaron Lefohn.
+Pasi Kärkkäinen identified and fixed several problems with
+GLX and SDL.  Nate Robins created the `wglinfo` utility, to
+which modifications were made by Michael Wimmer.
+
+## Contributions
+
+GLEW welcomes community contributions.  Typically these are co-ordinated
+via [Issues](https://github.com/nigels-com/glew/issues) or
+[Pull Requests](https://github.com/nigels-com/glew/pulls) in the
+GitHub web interface.
+
+Be sure to mention platform and compiler toolchain details when filing
+a bug report.  The output of `glewinfo` can be quite useful for discussion
+also.
+
+Generally GLEW is usually released once a year, around the time of the Siggraph
+computer graphics conference.  If you're not using the current release
+version of GLEW, be sure to check if the issue or bug is fixed there.
+
+## Copyright and Licensing
+
+GLEW is originally derived from the EXTGL project by Lev Povalahev.
+The source code is licensed under the
+[Modified BSD License](http://glew.sourceforge.net/glew.txt), the
+[Mesa 3-D License](http://glew.sourceforge.net/mesa.txt) (MIT) and the
+[Khronos License](http://glew.sourceforge.net/khronos.txt) (MIT).
+
+The automatic code generation scripts are released under the
+[GNU GPL](http://glew.sourceforge.net/gpl.txt).