Yet another OpenGL wrapper for Ruby

...and wrapper code generator.

Created : 2013-08-28
Last modified : 2024-02-25

Attention : Version 2 is now available

Though I will continue making this version 1.6 series of opengl-bindings available, please consider migrating to opengl-bindings2.

Redesigned API

In version 2, all OpenGL APIs are defined as public methods under module GL, so we don't have to include OpenGL and scatter OpenGL APIs under other modules any more:

# opengl-bindings
require 'opengl'
include OpenGL
# ...
glEnable(GL_DEPTH_TEST)

↓

# opengl-bindings2
require 'opengl'
# ...
GL.Enable(GL::DEPTH_TEST)

Improved efficiency

All redundant nil checks done on every API calls are removed in version 2:

# opengl-bindings1
module OpenGL
  #...
  def self.get_command( sym )
    if GL_FUNCTIONS_MAP[sym] == nil
      bind_command( sym )
    end
    return GL_FUNCTIONS_MAP[sym]
  end

  #...

  def glEnable(_cap_)
    f = OpenGL::get_command(:glEnable) # Every API call caused redundant nil check here
    f.call(_cap_)
  end

↓

# opengl-bindings2
module GL
  #...
  def self.Enable(_cap_)
    GL_FUNCTIONS_MAP[:glEnable].call(_cap_) # Hashmap is built on initialization so there's no need to do nil check at every API call
  end

Features

Version 2
Version 1
Uses Fiddle (One of the Ruby standard libraries that wraps libffi)
- Unlike opengl ( https://rubygems.org/gems/opengl ), you don't need to build C extension library
Uses Khronos XML API registry ( https://github.com/KhronosGroup/OpenGL-Registry )
- The command/enum wrapper codes are generated via 'gl.xml'
- Supports OpenGL - 4.6, OpenGL ES - 3.1 and all OpenGL extensions.

How to install

Via RubyGems ( https://rubygems.org/gems/opengl-bindings2 ):

$ gem install opengl-bindings2

Or grab all library codes (`lib/*.rb') and use them by adding as one of the load paths like:

$ ruby -I ./lib your_app.rb

How to use

See sample/simple.rb or sample/simple_glut.rb.

To get more samples and generator scripts, please visit: https://github.com/vaiorabbit/ruby-opengl

'opengl.rb' includes these scripts:
- 'opengl_command.rb' : OpenGL command wrapper (glDrawRangeElements, etc.). Generated via generator/generate_command.rb.
- 'opengl_enum.rb' : OpenGL enum wrapper (GL_TRIANGLE_STRIP, etc.). Generated via generator/generate_enum.rb.
- 'opengl_common.rb' : Provides utility functions.
- 'opengl_platform.rb' : Provides platform check functions (OpneGL.get_platform).
- 'opengl_windows.rb' : Provides functions for Windows platform (wglGetProcAddress, wglGetCurrentContext, wglGetCurrentDC).
- 'opengl_macosx.rb' : Provides functions for Mac OS X platform (CGLGetCurrentContext, CGLGetShareGroup).
- 'opengl_linux.rb' : Provides functions for Linux (X Window) platform (glXGetCurrentContext, glXGetCurrentDisplay).
'opengl_es.rb' is almost the same with 'opengl.rb', except for including 'opengl_es_command.rb' and 'opengl_es_enum.rb'.
'opengl_ext.rb' includes these scripts:
- 'opengl_ext_command.rb' : OpenGL extension command wrapper. Generated via generator/generate_ext_command.rb.
- 'opengl_ext_enum.rb' : OpenGL extension enum wrapper Generated via generator/generate_ext_enum.rb.
- 'opengl_ext_common.rb' : Provides utility functions.
'opengl_es_ext.rb' is almost the same with 'opengl_ext.rb', except for including 'opengl_es_ext_command.rb' and 'opengl_es_ext_enum.rb'.
'glfw.rb'
- My handwritten GLFW wrapper.
'glut.rb'
- GLUT wrapper. Supports API Level 4 (GLUT_API_VERSION = 4).
'glu.rb'
- My handwritten GLU wrapper.
'generator/gl.xml'
- Khronos' official XML API registry for OpenGL.
'generator/Rakefile'
- Type 'rake' to generate wrapper codes / fetch gl.xml.
- You can get the latest one by 'get_gl_xml.rb'.
'sample/simple.rb', 'sample/simple_glut.rb'
- Simple example.
- simple.rb : You need to get glfw3.dll (Windows) or libglfw.dylib (Mac OS X). See sample/README.md.
- simple_glut.rb : (For Windows uses) You need to get freeglut.dll. See sample/README.md.
'sample/data', 'sample/util'
- Data and utilities for sample programs.

Prerequisites

Fiddle
- A libffi wrapper
- Standard library since Ruby 2.0.0
- I recommend you to use Ruby 2.1.2 and later, which fixed Fiddle's memory leak issue (https://bugs.ruby-lang.org/issues/9599).

For sample

Use GLFW or GLUT for creating windows and OpenGL rendering contexts.

Tested Environment

Ruby
- ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]

Windows 10 Home, 64-bit (Version 1909, OS Build 18363.778)

NVIDIA GeForce RTX 2060 SUPER

OpenGL 4.5

> ruby report_env.rb
Version    : 4.5.0 NVIDIA 436.30
Vendor     : NVIDIA Corporation
Renderer   : GeForce RTX 2060 SUPER/PCIe/SSE2
Shader     : 4.50 NVIDIA

macOS 12.5.1, 64-bit

Mac mini (M1 2020)

OpenGL 4.1

$ ruby report_env.rb
Version    : 4.1 Metal - 76.3
Vendor     : Apple
Renderer   : Apple M1
Shader     : 4.10

Arch Linux kernel 4.1.2-2-ARCH, Nvidia Driver, x86_64
- NVIDIA GeForce GTS 450
  - OpenGL 4.5.0
```
$ ruby report_env.rb
Version: 4.5.0 NVIDIA 352.21
```
Arch Linux kernel 4.1.4-1-ARCH, Nouveau Driver, x86_64
- NVIDIA GeForce GTS 450
  - OpenGL 3.0
```
$ ruby report_env.rb
Version: 3.0 Mesa 10.6.3
```

Older versions

Ruby
- ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin21]
- ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [arm64-darwin20]
- ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x64-mingw32]
- ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [arm64-darwin20]
- ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [arm64-darwin20]
- ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x64-mingw32]
- ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20]
- ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [arm64-darwin20]
- ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x64-mingw32]
- ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
- ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
- ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
- ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin18]
- ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
- ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
- ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
- ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
- ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
- ruby 2.3.0p0 (2015-12-25 revision 53290) [x64-mingw32]
- ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
- ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
- ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
- ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
- ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]
- ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
- ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
- ruby 2.1.2p95 (2014-05-08 revision 45877) [i386-mingw32]
- ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin12.0]
- ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-darwin13.0.0]
- ruby 2.0.0p247 (2013-06-27) [i386-mingw32]
Windows 10 Home, 64-bit (Version 1511, OS Build 10586.164)
- NVIDIA GeForce GTX 960
  - OpenGL 4.5
```
> ruby report_env.rb
Version: 4.5.0 NVIDIA 364.72
```
Windows 7 Home Premium, 64-bit (Service Pack 1)
- NVIDIA GeForce GTX 560
  - OpenGL 4.3
```
> ruby report_env.rb
4.3.0
```
Windows 7 Home Premium, 64-bit (Service Pack 1)
- NVIDIA GeForce GTX 560
  - OpenGL 4.3
```
> ruby report_env.rb
4.3.0
```
Mac OS X 10.8.4, 64-bit
- NVIDIA GeForce 320M on Mac mini (Mid 2010)
  - OpenGL 2.1
```
$ ruby report_env.rb
2.1 NVIDIA-8.12.47 310.40.00.05f01
```
Mac OS X 10.10.5, 64-bit
- Intel Iris on Mac mini (Late 2014)
  - OpenGL 4.1
```
$ ruby report_env.rb
Version: 4.1 INTEL-10.6.33
```

Mac OS X 10.15.3, 64-bit

Intel Iris on Mac mini (Late 2014)

OpenGL 4.1

$ ruby report_env.rb
Version    : 4.1 INTEL-14.4.23
Vendor     : Intel Inc.
Renderer   : Intel Iris OpenGL Engine
Shader     : 4.10

Note

No Ruby-Style handy interfaces are available (like one in the ruby-opengl2 ( http://ruby-opengl.rubyforge.org/ ))

Example:

(Original C API)

GLuint tex_names_buf[2];
glGenTextures( 2, tex_names_buf );
GLuint tex_name = tex_names_buf[0];

(This library)

tex_names_buf = ' ' * 8 # String instance that is enough to catch texture names (integer).
glGenTextures( 2, tex_names_buf )
tex_name = tex_names_buf.unpack('L2')[0]

(ruby-opengl2)
```
tex_name = glGenTextures( 2 )[0]
```

Projects using opengl-bindings
- ruby-gnome2
  - https://github.com/ruby-gnome2/ruby-gnome2
  - https://github.com/ruby-gnome2/ruby-gnome2/tree/master/gtk3/sample/misc
    - gtkglarea1.rb, gtkglarea2.rb
- FXRuby - A library for cross-platform graphical user interfaces
  - https://github.com/larskanis/fxruby/blob/1.6/examples/glviewer.rb
- dxsdl2r
  - https://github.com/mirichi/dxsdl2r
- mittsu - A direct port of THREE.js from JavaScript/WebGL to Ruby/OpenGL
  - https://rubygems.org/gems/mittsu
  - https://github.com/danini-the-panini/mittsu
- open.gl.rb - A port of the https://open.gl/ tutorials to Ruby
  - https://github.com/mechazoidal/opendotgl_rb
- opencl-bindings - A Ruby binding for OpenCL 1.2
  - https://rubygems.org/gems/opencl-bindings
  - https://github.com/vaiorabbit/ruby-opencl
- perfume_dance - A BVH motion parser and playback implementation written in Ruby
  - https://github.com/vaiorabbit/perfume_dance
- imgui-bindings - ImGui wrapper for Ruby
  - https://rubygems.org/gems/imgui-bindings
  - https://github.com/vaiorabbit/ruby-imgui
- nanovg-bindings - NanoVG wrapper for Ruby
  - https://rubygems.org/gems/nanovg-bindings
  - https://github.com/vaiorabbit/nanovg-bindings
- raylib-bindings - Yet another raylib wrapper for Ruby
  - https://rubygems.org/gems/raylib-bindings
  - https://github.com/vaiorabbit/raylib-bindings
Other informative projects
- argon | neon
  - https://github.com/npomf/argon
  - https://bitbucket.org/npomf/neon/src
    - "vaiorabbit / ruby-opengl - as the basis for the OpenGL, OpenAL, and GLFW FFI libraries."

License

The zlib/libpng License ( http://opensource.org/licenses/Zlib ).

Copyright (c) 2013-2024 vaiorabbit <http://twitter.com/vaiorabbit>

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software in a
   product, an acknowledgment in the product documentation would be
   appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

Sample codes/resources under sample/GLExcess are provided under the GNU General Public License version 2. See sample/GLExcess/GPL2.txt .

Sample codes under sample/OrangeBook are provided under the BSD 3-Clause License. See sample/OrangeBook/3Dlabs-License.txt .

Ruby 用 OpenGL ラッパー (とその自動生成スクリプト)

Version 2 が利用可能です

Version 1.6 系の opengl-bindings も引き続き利用できるようにしますが、opengl-bindings2 への移行を検討してください。

API の修正

Version 2 では OpenGL API が module GL の public メソッドとして定義され、include OpenGL を実行する必要がなくなりました。

# opengl-bindings
require 'opengl'
include OpenGL
# ...
glEnable(GL_DEPTH_TEST)

↓

# opengl-bindings2
require 'opengl'
# ...
GL.Enable(GL::DEPTH_TEST)

効率の改善

API を呼ぶたびに走っていた無駄な nil のチェックが Version 2 では削除されています。

# opengl-bindings1
module OpenGL
  #...
  def self.get_command( sym )
    if GL_FUNCTIONS_MAP[sym] == nil
      bind_command( sym )
    end
    return GL_FUNCTIONS_MAP[sym]
  end

  #...

  def glEnable(_cap_)
    f = OpenGL::get_command(:glEnable) # Every API call caused redundant nil check here
    f.call(_cap_)
  end

↓

# opengl-bindings2
module GL
  #...
  def self.Enable(_cap_)
    GL_FUNCTIONS_MAP[:glEnable].call(_cap_) # Hashmap is built on initialization so there's no need to do nil check at every API call
  end

特徴

標準ライブラリ Fiddle を使っています ⇒ opengl ( https://rubygems.org/gems/opengl ) のように拡張ライブラリをビルドする必要がありません
関数とenumのラッパーコードは Khronos の XML API registry ( https://github.com/KhronosGroup/OpenGL-Registry ) の gl.xml から自動生成しています

インストール

RubyGems経由で ( https://rubygems.org/gems/opengl-bindings2 ):

$ gem install opengl-bindings2

もしくは lib 以下の *.rb をコピー → その場所をロードパスに加えて次のように起動:

$ ruby -I ./lib your_app.rb

使い方

sample/simple.rb または sample/simple_glut.rb を参照してください。

その他のサンプルと自動生成スクリプトはこちらで開発しています: https://github.com/vaiorabbit/ruby-opengl

内容

'opengl.rb' を require することで下記のスクリプトを取り込みます:
- 'opengl_command.rb' : OpenGL 関数のラッパーコード (glDrawRangeElements, etc.)。 generator/generate_command.rb で自動生成されたものです。
- 'opengl_enum.rb' : OpenGL enum のラッパーコード (GL_TRIANGLE_STRIP, etc.)。 generator/generate_enum.rb で自動生成されたものです。
- 'opengl_common.rb' : 共通のユーティリティ関数を提供しています。
- 'opengl_platform.rb' : 動作プラットフォームの判別機能を提供しています (OpneGL.get_platform)。
- 'opengl_windows.rb' : Windows 用の機能を提供しています (wglGetProcAddress, wglGetCurrentContext, wglGetCurrentDC).
- 'opengl_macosx.rb' : Mac OS X 用の機能を提供しています (CGLGetCurrentContext, CGLGetShareGroup).
- 'opengl_linux.rb' : Linux (X Window) 用の機能を提供しています (glXGetCurrentContext, glXGetCurrentDisplay).
'opengl_es.rb' は 'opengl_es_command.rb' と 'opengl_es_enum.rb' を取り込む以外は 'opengl.rb' と同じです。
'opengl_ext.rb' を require することで下記のスクリプトを取り込みます:
- 'opengl_ext_command.rb' : OpenGL 拡張関数のラッパーコード。 generator/generate_ext_command.rb で自動生成されたものです。
- 'opengl_ext_enum.rb' : OpenGL 拡張enumのラッパーコード。 generator/generate_ext_enum.rb で自動生成されたものです。
'opengl_es_ext.rb' は 'opengl_es_ext_command.rb' と 'opengl_es_ext_enum.rb' を取り込む以外は 'opengl_ext.rb' と同じです。
'glfw.rb'
- GLFW のラッパーコードです(自動生成ではありません)。
'glut.rb'
- GLUT ラッパー。API Level 4 までサポートしています (GLUT_API_VERSION = 4)。
'glu.rb'
- GLU のラッパーコードです(自動生成ではありません)。
'generator/gl.xml'
- Khronos 公式の XML API registry です。
'generator/Rakefile'
- 自動生成関連のタスクを自動化するためのものです。'rake' と打てば gl.xml の取得とラッパーコードの生成を実行します。
- gl.xml の取得だけなど、単体のタスクなら 'get_gl_xml.rb' などの個別Rubyスクリプトでも実行できます。
'sample/simple.rb', 'sample/simple_glut.rb'
- 一番簡単なサンプルです。
- simple.rb : 同じ場所に glfw3.dll (Windows) もしくは libglfw.dylib (Mac OS X) を置いてください。詳細は sample/README.md に記載されています。
- simple_glut.rb : (Windows の場合) freeglut.dll を置いてください。詳細は sample/README.md に記載されています。
'sample/data', 'sample/util'
- サンプルで共有する機能・データの配置場所です。

必要なもの

Fiddle
- libffi のラッパーです
- Ruby 2.0.0 以降で標準ライブラリになりました
- Fiddle のメモリリーク問題 (https://bugs.ruby-lang.org/issues/9599) が修正された Ruby 2.1.2 以降での利用を推奨します

サンプル用

GLFW か GLUT を用意してください。ウィンドウやレンダリングコンテキストの管理に必要です。

テストした環境

Ruby
- ruby 3.3.0 (2023-12-25 revision 5124f9ac75) [arm64-darwin23]

Windows 10 Home, 64-bit (Version 1909, OS Build 18363.778)

NVIDIA GeForce RTX 2060 SUPER

OpenGL 4.5

> ruby report_env.rb
Version    : 4.5.0 NVIDIA 436.30
Vendor     : NVIDIA Corporation
Renderer   : GeForce RTX 2060 SUPER/PCIe/SSE2
Shader     : 4.50 NVIDIA

macOS 12.5.1, 64-bit

Mac mini (M1 2020)

OpenGL 4.1

$ ruby report_env.rb
Version    : 4.1 Metal - 76.3
Vendor     : Apple
Renderer   : Apple M1
Shader     : 4.10

Arch Linux kernel 4.1.2-2-ARCH, Nvidia Driver, x86_64
- NVIDIA GeForce GTS 450
  - OpenGL 4.5.0
```
$ ruby report_env.rb
Version: 4.5.0 NVIDIA 352.21
```
Arch Linux kernel 4.1.4-1-ARCH, Nouveau Driver, x86_64
- NVIDIA GeForce GTS 450
  - OpenGL 3.0
```
$ ruby report_env.rb
Version: 3.0 Mesa 10.6.3
```

以前のバージョン

Ruby
- ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin21]
- ruby 3.1.0p0 (2021-12-25 revision fb4df44d16) [arm64-darwin20]
- ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [x64-mingw32]
- ruby 3.0.2p107 (2021-07-07 revision 0db68f0233) [arm64-darwin20]
- ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [arm64-darwin20]
- ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x64-mingw32]
- ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20]
- ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [arm64-darwin20]
- ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x64-mingw32]
- ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
- ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-darwin18]
- ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
- ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-darwin18]
- ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
- ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
- ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
- ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
- ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
- ruby 2.3.0p0 (2015-12-25 revision 53290) [x64-mingw32]
- ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
- ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
- ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-linux]
- ruby 2.2.2p95 (2015-04-13 revision 50295) [x86_64-darwin14]
- ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin14]
- ruby 2.2.0p0 (2014-12-25 revision 49005) [x86_64-darwin14]
- ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0]
- ruby 2.1.2p95 (2014-05-08 revision 45877) [i386-mingw32]
- ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin12.0]
- ruby 2.0.0p353 (2013-11-22 revision 43784) [x86_64-darwin13.0.0]
- ruby 2.0.0p247 (2013-06-27) [i386-mingw32]
Windows 10 Home, 64-bit (Version 1511, OS Build 10586.164)
- NVIDIA GeForce GTX 960
  - OpenGL 4.5
```
> ruby report_env.rb
Version: 4.5.0 NVIDIA 364.72
```
Windows 7 Home Premium, 64-bit (Service Pack 1)
- NVIDIA GeForce GTX 560
  - OpenGL 4.3
```
> ruby report_env.rb
4.3.0
```
Windows 7 Home Premium, 64-bit (Service Pack 1)
- NVIDIA GeForce GTX 560
  - OpenGL 4.3
```
> ruby report_env.rb
4.3.0
```
Mac OS X 10.8.4, 64-bit
- NVIDIA GeForce 320M on Mac mini (Mid 2010)
  - OpenGL 2.1
```
$ ruby report_env.rb
2.1 NVIDIA-8.12.47 310.40.00.05f01
```
Mac OS X 10.10.5, 64-bit
- Intel Iris on Mac mini (Late 2014)
  - OpenGL 4.1
```
$ ruby report_env.rb
Version: 4.1 INTEL-10.6.33
```

Mac OS X 10.15.3, 64-bit

Intel Iris on Mac mini (Late 2014)

OpenGL 4.1

$ ruby report_env.rb
Version    : 4.1 INTEL-14.4.23
Vendor     : Intel Inc.
Renderer   : Intel Iris OpenGL Engine
Shader     : 4.10

メモ

Rubyスタイルの便利なインターフェースはサポートしていません (ruby-opengl2 ( http://ruby-opengl.rubyforge.org/ ) にあったような感じのもの)

例:

(OpenGLオリジナルの C API)

GLuint tex_names_buf[2];
glGenTextures( 2, tex_names_buf );
GLuint tex_name = tex_names_buf[0];

(このライブラリの場合)

tex_names_buf = ' ' * 8 # テクスチャ名(GLuint)を受け取るのに十分なサイズ String インスタンスであればOK
glGenTextures( 2, tex_names_buf )
tex_name = tex_names_buf.unpack('L2')[0]

(ruby-opengl2 の場合)

tex_name = glGenTextures( 2 )[0] # glGenTextures が配列を返すように修正されています

opengl-bindings を使ったプロジェクト
- ruby-gnome2
  - https://github.com/ruby-gnome2/ruby-gnome2
  - https://github.com/ruby-gnome2/ruby-gnome2/tree/master/gtk3/sample/misc
    - gtkglarea1.rb, gtkglarea2.rb
- FXRuby - A library for cross-platform graphical user interfaces
  - https://github.com/larskanis/fxruby/blob/1.6/examples/glviewer.rb
- dxsdl2r
  - https://github.com/mirichi/dxsdl2r
- mittsu - A direct port of THREE.js from JavaScript/WebGL to Ruby/OpenGL
  - https://rubygems.org/gems/mittsu
  - https://github.com/jellymann/mittsu
- open.gl.rb - A port of the https://open.gl/ tutorials to Ruby
  - https://github.com/mechazoidal/opendotgl_rb
- opencl-bindings - A Ruby binding for OpenCL 1.2
  - https://rubygems.org/gems/opencl-bindings
  - https://github.com/vaiorabbit/ruby-opencl
- perfume_dance - A BVH motion parser and playback implementation written in Ruby
  - https://github.com/vaiorabbit/perfume_dance
- imgui-bindings - ImGui wrapper for Ruby
  - https://rubygems.org/gems/imgui-bindings
  - https://github.com/vaiorabbit/ruby-imgui
- nanovg-bindings - NanoVG wrapper for Ruby
  - https://rubygems.org/gems/nanovg-bindings
  - https://github.com/vaiorabbit/nanovg-bindings
- raylib-bindings - Yet another raylib wrapper for Ruby
  - https://rubygems.org/gems/raylib-bindings
  - https://github.com/vaiorabbit/raylib-bindings
参考になりそうなプロジェクト
- argon | neon
  - https://github.com/npomf/argon
  - https://bitbucket.org/npomf/neon/src
    - "vaiorabbit / ruby-opengl - as the basis for the OpenGL, OpenAL, and GLFW FFI libraries."

ライセンス

zlib/libpng ライセンスです ( http://opensource.org/licenses/Zlib )。
sample/GLExcess 以下にあるものについては GNU General Public License version 2 です。 sample/GLExcess/GPL2.txt を参照してください。
sample/OrangeBook 以下にあるものについては修正BSDライセンスです。 sample/OrangeBook/3Dlabs-License.txt を参照してください。

opengl-bindings2

Yet another OpenGL wrapper for Ruby

Attention : Version 2 is now available

Redesigned API

Improved efficiency

Features

How to install

How to use

Contents

Prerequisites

For sample

Tested Environment

Note

License

Ruby 用 OpenGL ラッパー (とその自動生成スクリプト)

Version 2 が利用可能です

API の修正

効率の改善

特徴

インストール

使い方

内容

必要なもの

サンプル用

テストした環境

メモ

ライセンス