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256 lines
8.7 KiB
Markdown
256 lines
8.7 KiB
Markdown
# GLEW - The OpenGL Extension Wrangler Library
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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.
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http://glew.sourceforge.net/
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https://github.com/nigels-com/glew
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[](https://gitter.im/nigels-com/glew?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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[](https://sourceforge.net/projects/glew/files/latest/download)
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## Table of Contents
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* [Downloads](#downloads)
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* [Recent snapshots](#recent-snapshots)
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* [Build](#build)
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* [Linux and Mac](#linux-and-mac)
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* [Using GNU Make](#using-gnu-make)
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* [Install build tools](#install-build-tools)
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* [Build](#build-1)
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* [Linux EGL](#linux-egl)
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* [Linux OSMesa](#linux-osmesa)
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* [Linux mingw-w64](#linux-mingw-w64)
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* [Using cmake](#using-cmake)
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* [Install build tools](#install-build-tools-1)
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* [Build](#build-2)
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* [Windows](#windows)
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* [Visual Studio](#visual-studio)
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* [MSYS/Mingw](#msysmingw)
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* [MSYS2/Mingw-w64](#msys2mingw-w64)
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* [glewinfo](#glewinfo)
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* [Code Generation](#code-generation)
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* [Authors](#authors)
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* [Contributions](#contributions)
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* [Copyright and Licensing](#copyright-and-licensing)
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## Downloads
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Current release is [2.3.0](https://github.com/nigels-com/glew/releases/tag/glew-2.3.0).
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[(Change Log)](http://glew.sourceforge.net/log.html)
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Sources available as
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[ZIP](https://github.com/nigels-com/glew/releases/download/glew-2.3.0/glew-2.3.0.zip) or
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[TGZ](https://github.com/nigels-com/glew/releases/download/glew-2.3.0/glew-2.3.0.tgz).
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Windows binaries for [32-bit and 64-bit](https://github.com/nigels-com/glew/releases/download/glew-2.3.0/glew-2.3.0-win32.zip).
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### Recent snapshots
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Snapshots may contain new features, bug-fixes or new OpenGL extensions ahead of tested, official releases.
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[glew-20220402.tgz](https://sourceforge.net/projects/glew/files/glew/snapshots/glew-20220402.tgz/download) *GLEW 2.2.0 - with fix for glCreateProgressFenceNVX*
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## Build
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It is highly recommended to build from a tgz or zip release snapshot.
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The code generation workflow is a complex brew of gnu make, perl and python, that works best on Linux or Mac.
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The code generation is known to work on Windows using [MSYS2](https://www.msys2.org/).
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For most end-users of GLEW the official releases are the best choice, with first class support.
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### Linux and Mac
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#### Using GNU Make
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GNU make is the primary build system for GLEW, historically.
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It includes targets for building the sources and headers, for maintenance purposes.
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##### Install build tools
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Debian/Ubuntu/Mint: `$ sudo apt-get install build-essential libxmu-dev libxi-dev libgl-dev`
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RedHat/CentOS/Fedora: `$ sudo yum install libXmu-devel libXi-devel libGL-devel`
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FreeBSD: `# pkg install xorg lang/gcc git cmake gmake bash python perl5`
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##### Build
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$ make
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$ sudo make install
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$ make clean
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Targets: `all, glew.lib (sub-targets: glew.lib.shared, glew.lib.static), glew.bin, clean, install, uninstall`
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Variables: `SYSTEM=linux-clang, GLEW_DEST=/usr/local, STRIP=`
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_Note: you may need to call `make` in the **auto** folder first_
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##### Linux EGL
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$ sudo apt install libegl1-mesa-dev
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$ make SYSTEM=linux-egl
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##### Linux OSMesa
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$ sudo apt install libosmesa-dev
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$ make SYSTEM=linux-osmesa
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##### Linux mingw-w64
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$ sudo apt install mingw-w64
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$ make SYSTEM=linux-mingw32
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$ make SYSTEM=linux-mingw64
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#### Using cmake
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The cmake build is mostly contributor maintained.
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Due to the multitude of use cases this is maintained on a _best effort_ basis.
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Pull requests are welcome.
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*CMake 3.16 or higher is required.*
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##### Install build tools
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Debian/Ubuntu/Mint: `$ sudo apt-get install build-essential libxmu-dev libxi-dev libgl-dev cmake git`
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RedHat/CentOS/Fedora: `$ sudo yum install libXmu-devel libXi-devel libGL-devel cmake git`
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##### Build
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$ cd build
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$ cmake ./cmake
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$ make -j4
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| Target | Description |
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| ---------- | ----------- |
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| glew | Build the glew shared library. |
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| glew_s | Build the glew static library. |
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| glewinfo | Build the `glewinfo` executable (requires `BUILD_UTILS` to be `ON`). |
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| visualinfo | Build the `visualinfo` executable (requires `BUILD_UTILS` to be `ON`). |
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| install | Install all enabled targets into `CMAKE_INSTALL_PREFIX`. |
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| clean | Clean up build artifacts. |
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| all | Build all enabled targets (default target). |
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| Variables | Description |
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| --------------- | ----------- |
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| BUILD_UTILS | Build the `glewinfo` and `visualinfo` executables. |
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| GLEW_REGAL | Build in Regal mode. |
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| GLEW_OSMESA | Build in off-screen Mesa mode. |
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| BUILD_FRAMEWORK | Build as MacOSX Framework. Setting `CMAKE_INSTALL_PREFIX` to `/Library/Frameworks` is recommended. |
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### Windows
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#### Visual Studio
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Use the provided Visual Studio project file in build/vc15/
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Projects for vc6, vc10, vc12 and vc14 are also provided
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#### MSYS/Mingw
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Available from [Mingw](http://www.mingw.org/)
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Requirements: bash, make, gcc
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$ mingw32-make
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$ mingw32-make install
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$ mingw32-make install.all
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Alternative toolchain: `SYSTEM=mingw-win32`
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#### MSYS2/Mingw-w64
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Available from [Msys2](http://msys2.github.io/) and/or [Mingw-w64](http://mingw-w64.org/)
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Requirements: bash, make, gcc
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$ pacman -S gcc make mingw-w64-i686-gcc mingw-w64-x86_64-gcc
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$ make
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$ make install
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$ make install.all
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Alternative toolchain: `SYSTEM=msys, SYSTEM=msys-win32, SYSTEM=msys-win64`
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## glewinfo
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`glewinfo` is a command-line tool useful for inspecting the capabilities of an
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OpenGL implementation and GLEW support for that. Please include `glewinfo.txt`
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with bug reports, as appropriate.
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---------------------------
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GLEW Extension Info
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---------------------------
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GLEW version 2.0.0
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Reporting capabilities of pixelformat 3
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Running on a Intel(R) HD Graphics 3000 from Intel
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OpenGL version 3.1.0 - Build 9.17.10.4229 is supported
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GL_VERSION_1_1: OK
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---------------
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GL_VERSION_1_2: OK
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---------------
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glCopyTexSubImage3D: OK
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glDrawRangeElements: OK
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glTexImage3D: OK
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glTexSubImage3D: OK
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...
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## Code Generation
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A Unix or Mac environment is needed for building GLEW from scratch to
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include new extensions, or customize the code generation. The extension
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data is regenerated from the top level source directory with:
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make extensions
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An alternative to generating the GLEW sources from scratch is to
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download a pre-generated (unsupported) snapshot:
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https://sourceforge.net/projects/glew/files/glew/snapshots/
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## Authors
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GLEW is currently maintained by [Nigel Stewart](https://github.com/nigels-com)
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with bug fixes, new OpenGL extension support and new releases.
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GLEW was developed by [Milan Ikits](http://www.cs.utah.edu/~ikits/)
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and [Marcelo Magallon](http://wwwvis.informatik.uni-stuttgart.de/~magallon/).
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Aaron Lefohn, Joe Kniss, and Chris Wyman were the first users and also
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assisted with the design and debugging process.
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The acronym GLEW originates from Aaron Lefohn.
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Pasi Kärkkäinen identified and fixed several problems with
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GLX and SDL. Nate Robins created the `wglinfo` utility, to
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which modifications were made by Michael Wimmer.
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## Contributions
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GLEW welcomes community contributions. Typically these are co-ordinated
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via [Issues](https://github.com/nigels-com/glew/issues) or
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[Pull Requests](https://github.com/nigels-com/glew/pulls) in the
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GitHub web interface.
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Be sure to mention platform and compiler toolchain details when filing
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a bug report. The output of `glewinfo` can be quite useful for discussion
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also.
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Generally GLEW is usually released once a year, around the time of the Siggraph
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computer graphics conference. If you're not using the current release
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version of GLEW, be sure to check if the issue or bug is fixed there.
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## Copyright and Licensing
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GLEW is originally derived from the EXTGL project by Lev Povalahev.
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The source code is licensed under the
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[Modified BSD License](http://glew.sourceforge.net/glew.txt), the
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[Mesa 3-D License](http://glew.sourceforge.net/mesa.txt) (MIT) and the
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[Khronos License](http://glew.sourceforge.net/khronos.txt) (MIT).
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The automatic code generation scripts are released under the
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[GNU GPL](http://glew.sourceforge.net/gpl.txt).
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