Ruby/SDL 2.2.0
Ohbayashi Ippei

= What's Ruby/SDL

Ruby/SDL is the ruby extension library to use SDL.
SDL(Simple DirectMedia Layer) is a cross-platform multimedia library      
designed to provide fast access to the graphics framebuffer and audio    
devices. See http://www.libsdl.org/ if you want to know SDL in detail.

= Platform
This library supports Linux, Win32, MacOS X.

This library perhaps works on FreeBSD and other standard
Unix-like systems.

= Library Needed

Ruby/SDL needs Ruby and SDL and optionally uses SDL_image, SDL_mixer,
SDL_ttf, SGE, OpenGL  and SMPEG.

Indispensable
Ruby   http://www.ruby-lang.org/
SDL   http://www.libsdl.org/

Optional
SDL_mixer   http://www.libsdl.org/projects/SDL_mixer/index.html
SDL_ttf   http://www.libsdl.org/projects/SDL_ttf/index.html
SDL_image   http://www.libsdl.org/projects/SDL_image/index.html
SGE   http://www.etek.chalmers.se/~e8cal1/sge/
SMPEG  http://www.icculus.org/smpeg/
SDLSKK http://www.kmc.gr.jp/~ohai/sdlskk.en.html

= INSTALL

Some packages are available: Debian's .deb, FreeBSD's ports,
or Windows' zipfile.

RubyGems are also available. You can install Ruby/SDL:
  gem install rubysdl


You can install from source code as follows:
(1)install Ruby
  See Ruby's document and install.

(2)install SDL
  Extract SDL's source and run './configure'.
  And run 'make','make install'.

(3)install SGE
  Run 'make' and 'make install'.
  
(4)install SDL_mixer, SDL_ttf, SDL_image, SMPEG and SDLSKK
  See documents of these libraries and install them .

(5)install this extension library,Ruby/SDL
  Run 'ruby extconf.rb','make' and 'make install'.

(6) (Mac OS X user only) install rsdl
  Run 'gem install rsdl'.
  rsdl is a wrapper of the Ruby interpreter. This wrapper
  prepares Cocoa framework before running the interpreter.

= Use SGE without installing the library
You can use SGE without intalling:
  gem install rubysdl -- --enable-bundled-sge
or
  ruby extconf.rb --enable-bundled-sge

However, please do not use this option if you have
other way. Please install SGE separately if possible.

= USE Ruby/SDL
  Write "require 'sdl'" in your Ruby script.
  If your system is OS X, you must use rsdl command 
  as an interpreter instead of ruby command.

  See following documents and samples if you want to know the detail.

  sample/*.rb
    Ruby/SDL samples. In some scripts, you have to prepare data such as
    "sample.wav" and "sample.mpg".
  rubysdl_ref.en.html
    The reference manual
  rubysdl_ref.en.rd
    RD style reference manual(the contents is same as rubysdl_ref.en.html)
  documents of SDL
    This is in SDL archive.
    Please read this when you want to know what does't describe
    these documents.

= OpenGL
  You can use OpenGL with this library.

  (1) Setup OpenGL and SDL.
  (2) Install ruby-opengl (http://ruby-opengl.rubyforge.org/)
  (3) Run "ruby extconf.rb", "make", and "make install"
  (4) Write "require 'sdl'; require 'opengl'"  in your script.

  We use OpenGL through ruby-opengl.
  Please see SDL's document,OpenGL document and sample/testgl.rb .

= LICENSE
  This library is distributed under GNU LGPL version 2.1 or later,
  which can be found in the file "LICENSE".
  But samples, the Ruby scripts sample/*.rb, are not under LGPL, and
  you can use their files freely.
 
= Thanks
  Thanks to ...
  Tamura : some patches and advertising
  Akinori MUSHA : Porting on FreeBSD
  Danny van Bruggen : some ideas are from his library "RUDL"
  akira yamada : patch of SDL::TTF, making packages of Vine and Debian.
  Wayne Conrad : some patches
  Christian Neukirchen, Kent Dahl : send a patch
  Keffin Barnaby : some patches
  Rorien Dunn, Dennis Ranke, Keita Urashima : bug reports and useful information
  Yusuke TABATA : introduce me into SDL world
  SDLdoc Japanese translation project : base of Ruby/SDL's reference manual
  Hara Yutaka: Sample TrueTypeFont, MacOS X support
  Members of #sdl-fan-jp @ FriendChat: bug reports and advices
  Cyross Makoto: Windows support
  Dwayne C. Litzenberger: Some patches

= OTHER
  Some functions, especially SDL::MPEG methods and pallete handling methods,
  are not tested.

= AUTHORS
  Ippei Obayashi: main developer
  Cyross Makoto: Windows suppport
  yhara: MacOS X support

  Please send comments and bug reports to the author.
  Author's mail address: ohai@kmc.gr.jp