Class: Game

Inherits:
Object
  • Object
show all
Defined in:
lib/game_2d/game.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Game

Returns a new instance of Game.



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# File 'lib/game_2d/game.rb', line 29

def initialize(args)
  all_storage = Storage.in_home_dir(args[:storage] || DEFAULT_STORAGE)
  @player_storage = all_storage.dir('players')['players']
  @levels_storage = all_storage.dir('levels')
  level_storage = @levels_storage[args[:level]]

  if level_storage.empty?
    @space = GameSpace.new(self).establish_world(
      args[:level],
      nil, # level ID
      args[:width] || WORLD_WIDTH,
      args[:height] || WORLD_HEIGHT)
    @space.storage = level_storage
  else
    @space = GameSpace.load(self, level_storage)
  end

  @tick = -1
  @player_actions = Hash.new {|h,tick| h[tick] = Array.new}

  @self_check, @profile, @registry_broadcast_every = args.values_at(
  :self_check, :profile, :registry_broadcast_every)
  @registry_broadcast_every ||= DEFAULT_REGISTRY_BROADCAST_EVERY

  # This should never happen.  It can only happen client-side because a
  # registry update may create an entity before we get around to it in,
  # say, add_npc
  def @space.fire_duplicate_id(old_entity, new_entity)
    raise "#{old_entity} and #{new_entity} have same ID!"
  end

  # This should never happen.  It can only happen client-side because a
  # registry update may delete an entity before we get around to it in
  # purge_doomed_entities
  def @space.fire_entity_not_found(entity)
    raise "Object #{entity} not in registry"
  end

  @port = _create_server_port(self,
    args[:port] || DEFAULT_PORT,
    args[:max_clients] || MAX_CLIENTS)
end

Instance Attribute Details

#tick ⇒ Object (readonly)

Returns the value of attribute tick.



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# File 'lib/game_2d/game.rb', line 76

def tick
  @tick
end

Class Method Details

.fire_duplicate_id(old_entity, new_entity) ⇒ Object

This should never happen. It can only happen client-side because a registry update may create an entity before we get around to it in, say, add_npc



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# File 'lib/game_2d/game.rb', line 56

def @space.fire_duplicate_id(old_entity, new_entity)
  raise "#{old_entity} and #{new_entity} have same ID!"
end

.fire_entity_not_found(entity) ⇒ Object

This should never happen. It can only happen client-side because a registry update may delete an entity before we get around to it in purge_doomed_entities



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# File 'lib/game_2d/game.rb', line 63

def @space.fire_entity_not_found(entity)
  raise "Object #{entity} not in registry"
end

Instance Method Details

#[](id) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 147

def [](id)
  @space[id]
end

#_create_server_port(*args) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 72

def _create_server_port(*args)
  ServerPort.new *args
end

#add_npcs(npcs_json) ⇒ Object

Answering request from client



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# File 'lib/game_2d/game.rb', line 127

def add_npcs(npcs_json)
  npcs_json.each {|json| @space << Serializable.from_json(json) }
end

#add_player(player_name) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 97

def add_player(player_name)
  player = Player.new(player_name)
  player.x = (@space.width - Entity::WIDTH) / 2
  player.y = (@space.height - Entity::HEIGHT) / 2
  other_players = @space.players.dup
  @space << player
  other_players.each {|p| player_connection(p).add_player(player, @tick) }
  player
end

#add_player_action(action) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 159

def add_player_action(action)
  at_tick, player_id = action[:at_tick], action[:player_id]
  unless at_tick
    $stderr.puts "Received update from #{player_id} without at_tick!"
    at_tick = @tick + 1
  end
  if at_tick <= @tick
    $stderr.puts "Received update from #{player_id} #{@tick + 1 - at_tick} ticks late"
    at_tick = @tick + 1
  end
  @player_actions[at_tick] << action
end

#delete_entity(entity) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 119

def delete_entity(entity)
  puts "Deleting #{entity}"
  @space.doom entity
  @space.purge_doomed_entities
  each_player_conn {|pc| pc.delete_entity entity, @tick }
end

#each_player_conn ⇒ Object 



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# File 'lib/game_2d/game.rb', line 115

def each_player_conn
  get_all_players.each {|p| yield player_connection(p)}
end

#get_all_npcs ⇒ Object 



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# File 'lib/game_2d/game.rb', line 155

def get_all_npcs
  @space.npcs
end

#get_all_players ⇒ Object 



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# File 'lib/game_2d/game.rb', line 151

def get_all_players
  @space.players
end

#player_connection(player) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 111

def player_connection(player)
  player_id_connection(player.registry_id)
end

#player_data(player_name) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 88

def player_data(player_name)
  @player_storage[player_name]
end

#player_id_connection(player_id) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 107

def player_id_connection(player_id)
  @port.player_connection(player_id)
end

#process_player_actions ⇒ Object 



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# File 'lib/game_2d/game.rb', line 172

def process_player_actions
  if actions = @player_actions.delete(@tick)
    actions.each do |action|
      player_id = action.delete :player_id
      player = @space[player_id]
      unless player
        $stderr.puts "No such player #{player_id} -- dropping move"
        next
      end
      if (move = action[:move])
        player.add_move move
      elsif (npcs = action[:add_npcs])
        add_npcs npcs
      elsif (entities = action[:update_entities])
        update_npcs entities
      elsif (entity_id = action[:snap_to_grid])
        @space.snap_to_grid entity_id.to_sym
      else
        $stderr.puts "IGNORING BAD DATA from #{player}: #{action.inspect}"
      end
    end
  end
end

#run ⇒ Object 



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# File 'lib/game_2d/game.rb', line 258

def run
  run_start = Time.now.to_r
  loop do
    TICKS_PER_SECOND.times do |n|
      update

      # This results in something approaching TICKS_PER_SECOND
      @port.update_until(run_start + Rational(@tick, TICKS_PER_SECOND))

      $stderr.puts "Updates per second: #{@tick / (Time.now.to_r - run_start)}" if @profile
    end # times
  end # infinite loop
end

#save ⇒ Object 



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# File 'lib/game_2d/game.rb', line 84

def save
  @space.save
end

#send_full_updates ⇒ Object

New players always get a full update (with some additional information) Everyone else gets full registry dump every N ticks, where N == @registry_broadcast_every



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# File 'lib/game_2d/game.rb', line 228

def send_full_updates
  # Set containing brand-new players' IDs
  new_players = @port.new_players

  each_player_conn do |pc|
    if new_players.include? pc.player_id
      response = {
        :you_are => pc.player_id,
        :world => {
          :world_name => world_name,
          :world_id => world_id,
          :highest_id => world_highest_id,
          :cell_width => world_cell_width,
          :cell_height => world_cell_height,
        },
        :add_players => get_all_players,
        :add_npcs => get_all_npcs,
        :at_tick => tick,
      }
      pc.send_record response, true # answer login reliably
    elsif @registry_broadcast_every > 0 && (@tick % @registry_broadcast_every == 0)
      pc.send_record( {
        :registry => @space.all_registered,
        :highest_id => @space.highest_id,
        :at_tick => @tick,
      }, false, 1 )
    end
  end
end

#send_updated_entities(*entities) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 143

def send_updated_entities(*entities)
  each_player_conn {|pc| pc.update_entities entities, @tick }
end

#store_player_data(player_name, data) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 92

def store_player_data(player_name, data)
  @player_storage[player_name] = data
  @player_storage.save
end

#update ⇒ Object 



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# File 'lib/game_2d/game.rb', line 196

def update
  @tick += 1

  # This will:
  # 1) Queue up player actions for existing players
  #    (create_npc included)
  # 2) Add new players in response to login messages
  # 3) Remove players in response to disconnections
  @port.update

  # This will execute player moves, and create NPCs
  process_player_actions

  # Objects that exist by now will be updated
  # Objects created during this update won't be updated
  # themselves this tick
  @space.update

  # Do this at the end, so the update contains all the
  # latest and greatest news
  send_full_updates

  if @self_check
    @space.check_for_grid_corruption
    @space.check_for_registry_leaks
  end
end

#update_npcs(npcs_json) ⇒ Object 



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# File 'lib/game_2d/game.rb', line 131

def update_npcs(npcs_json)
  npcs_json.each do |json|
    id = json[:registry_id]
    if entity = @space[id]
      entity.update_from_json json
      entity.grab!
    else
      $stderr.puts "Can't update #{id}, doesn't exist"
    end
  end
end

#world_cell_height ⇒ Object 



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# File 'lib/game_2d/game.rb', line 82

def world_cell_height; @space.cell_height; end

#world_cell_width ⇒ Object 



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# File 'lib/game_2d/game.rb', line 81

def world_cell_width; @space.cell_width; end

#world_highest_id ⇒ Object 



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# File 'lib/game_2d/game.rb', line 80

def world_highest_id; @space.highest_id; end

#world_id ⇒ Object 



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# File 'lib/game_2d/game.rb', line 79

def world_id; @space.world_id; end

#world_name ⇒ Object 



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# File 'lib/game_2d/game.rb', line 78

def world_name; @space.world_name; end