Contents

module Baku
  class World
    attr_reader :entity_manager, :blackboard, :delta_ms
    
    def initialize
      # TODO: there's currently no way to interleave update and draw systems.
      # Is this something we'll eventually need?
      @update_systems = []
      @draw_systems = []

      @entity_manager = EntityManager.new
      
      @blackboard = {}
    end

    def add_system(system)
      system_list = 
        if system.game_loop_step == :update
          @update_systems
        elsif system.game_loop_step == :draw
          @draw_systems
        end

      if system_list.map(&:class).include?(system.class)
        raise StandardError.new("Already added #{system.class} system to world.")
      end
      
      system_list << system

      @entity_manager.register_component_mask(system.component_mask)
      
      system.world = self
    end

    def create_entity(tags = [])
      entity = Entity.new(tags)
      @entity_manager.add_entity(entity)
      entity
    end

    def destroy_entity(entity)
      @entity_manager.remove_entity(entity)
    end

    def update(delta_ms)
      @delta_ms = delta_ms
      
      @update_systems.each do |system|
        system.process_entities
      end
    end

    def draw
      @draw_systems.each do |system|
        system.process_entities
      end
    end
  end
end

Version data entries

2 entries across 2 versions & 1 rubygems

Version	Path
baku-0.2.2	lib/baku/world.rb
baku-0.2.1	lib/baku/world.rb