configure do
  unless File.exists?("wfobj/WFObj.cc")
    $stderr.puts "git submodules appear to be missing. Run `git submodule update --init`."
    exit 1
  end
  if RUBY_PLATFORM =~ /mingw/
    check_lib "opengl32"
    check_lib "glu32"
    check_lib "mingw32"
  else
    check_lib "X11"
    check_lib "GL"
    check_lib "GLU"
  end
  check_lib "ode"
  check_cfg program: "sdl-config"
end

build do
  Environment.new do |env|
    env.add_builder(:GenLoadFile) do |params|
      command = ["perl", "genLoadFile.pl", "--root=../logo", "dwlogo.obj", "dwlogo.mtl"]
      unless @cache.up_to_date?(@target, command, @sources, @env)
        print_run_message("GenLoadFile #{@target}", nil)
        system(*command, chdir: "LoadFile")
        @cache.register_build(@target, command, @sources, @env)
      end
      true
    end
    env["CCFLAGS"] = %w[-O2 -Wall]
    env["CPPPATH"] += %w[.]
    sources = ["dwscr.cc", "wfobj/WFObj.cc", "LoadFile/LoadFile.cc"] + glob("ss/*.{cc,cpp}")
    if RUBY_PLATFORM =~ /mingw/
      sources += ["displayinfo-win32.cc"]
    else
      sources += ["displayinfo.cc"]
    end
    loadfiles = %w[
      logo/dwlogo.obj
      logo/dwlogo.mtl
    ]
    loadfile_gen = env.GenLoadFile("LoadFile/LoadFile-gen.inc", loadfiles + ["LoadFile/genLoadFile.pl"])
    dwscr = env.Program("dwscr", sources)
    if RUBY_PLATFORM =~ /mingw/
      env.Install("C:/Windows/dwscr.scr", dwscr)
    end
  end
end