Ruby, SDL and OpenGL

NOTE: This is an old post which I am merely republishing. The earlier version was lost due to a RAID failure on my former web host’s server.

I had a bit of trouble tracking down decent documentation for Ruby/SDL and Ruby/OpenGL, so I thought I’d put together some sample code in case anybody is interested in it.

require 'sdl'
require 'opengl'

# initialize SDL and OpenGL
SDL.init(SDL::INIT_VIDEO | SDL::INIT_AUDIO | SDL::INIT_TIMER)
screen = SDL.set_video_mode(800, 600, 16, SDL::HWSURFACE | SDL::OPENGL)
GL.ClearColor(0.0, 0.0, 1.0)
GL.ClearDepth(1.0)

finished = false
while not finished
  # pull events from the input queue
  while event = SDL::Event2.poll
    # watch for quit events
    if event.kind_of?(SDL::Event2::Quit)
      finished = true
      break
    end
  end

  # clear the screen
  GL.Clear(GL::COLOR_BUFFER_BIT | GL::DEPTH_BUFFER_BIT)

  # TODO: rendering code goes here!

  # display the back buffer
  SDL.GL_swap_buffers
end

# terminate SDL
SDL.quit

Obviously, the convention is underscored lower case method names for Ruby/SDL (although camelCase aliases are provided too), while Ruby/OpenGL’s API uses UpperCamelCase and breaks Ruby convention by using a capital letter for the first character.

Update: Here’s documentation for Ruby/SDL .