[DragonRuby] Recycle Symbols for Render Targets (general idea)

main.rb

$gtk.reset

def tick args
  args.state.rt_symbols_recycle_bin = []
  args.state.rt_symbol_counter = 0

  if args.state.tick_count == 0

    # get a couple of fresh symbols
    symbol1 = get_rt_symbol(args)
    puts symbol1

    symbol2 = get_rt_symbol(args)
    puts symbol2

    # finished using first symbol, recycle it
    recycle_rt_symbol(args, symbol1)

    # next fetched symbol recycles first
    symbol3 = get_rt_symbol(args)
    puts symbol3
  end
end

def get_rt_symbol(args)
  if args.state.rt_symbols_recycle_bin.length == 0
    sym = "rt_symbol_#{args.state.rt_symbol_counter}".to_sym
    args.state.rt_symbol_counter += 1
    sym
  else
    args.state.rt_symbols_recycle_bin.shift
  end
end

def recycle_rt_symbol(args, abandoned_symbol)
  args.state.rt_symbols_recycle_bin << abandoned_symbol
end