[Script]Anti-Lag

#===============================================================================
# ** AntiLag Script
#-------------------------------------------------------------------------------
# f0tz!baerchen
# 0.71
# 06.01.2007
#-------------------------------------------------------------------------------
# Credits:
# Chaosg1 (for testing ;) )
# NearFantastica (for the Event AntiLag I used and improved)
#-------------------------------------------------------------------------------
# Features:
# - Event AntiLag: Event (and their Sprites) which are not on the screen are
#  not updated except they run on "Autostart" or "Parallel Process" or they
#  have an empty comment in the first line
# - High Priority: Game can be run on high priority
# - Smooth Antilag: the Event AntiLag does only work fine if the events are
#  distributed over the whole map, but when there are many events at the same
#  place it lags again. If the script notices that the CPU utilization
#  gets higher than $antilag.max_cpu_utilization it will slow down the game and
#  reduce the framerate as long as needed.
#-------------------------------------------------------------------------------
# Settings:
# can be changed anytime during the game. They are found at the end of the
# script.
#===============================================================================
#===============================================================================
# Class for Antilag Settings
#===============================================================================
class Antilag_Settings
 
  attr_accessor :event
  attr_accessor :max_cpu_utilization
  attr_accessor :cpu_tolerance
  #-----------------------------------------------------------------------------
  # initializes default settings
  #-----------------------------------------------------------------------------
  def initialize
    @event = true
    @high_priority = true
    @max_cpu_utilization = 100
    @cpu_tolerance = 20
    @SetPriorityClass = Win32API.new('kernel32', 'SetPriorityClass',
                                    ['p', 'i'], 'i')
    @GetProcessTimes = Win32API.new('kernel32', 'GetProcessTimes',
                                    ['i','p','p','p','p'], 'i')
  end
  #-----------------------------------------------------------------------------
  # turns high priority on/off
  #-----------------------------------------------------------------------------
  def high_priority=(value)
    @high_priority = value
   
    if @high_priority
      @SetPriorityClass.call(-1, 0x00000080) # High Priority
    else
      @SetPriorityClass.call(-1, 0x00000020) # Normal Priority
    end
  end
  #-----------------------------------------------------------------------------
  # returns the current CPU Utilization
  #-----------------------------------------------------------------------------
  def get_cpu_utilization
    # uses API Call to get the Kernel and User Time
    creation_time = '0' * 10
    exit_time = '0' * 10
    kernel_time = '0' * 10
    user_time = '0' * 10
    @GetProcessTimes.call(-1, creation_time, exit_time, kernel_time, user_time)
    # converts times into integer (in 100ns)
    kernel_time = kernel_time.unpack('l2')
    user_time = user_time.unpack('l2')
    kernel_time = kernel_time[0] + kernel_time[1]
    user_time = user_time[0] + user_time[1]
    # takes differences to calculate cpu utilization
    if @old_time != nil
      timer_difference = Time.new - @old_timer
      time_difference = kernel_time + user_time - @old_time
      result = time_difference / timer_difference / 100000
    else
      result = $antilag.max_cpu_utilization
    end
    # saves values (to calculate the differences, s.a.)
    @old_timer = Time.new
    @old_time = kernel_time + user_time
    return result
  end
end
$antilag = Antilag_Settings.new
#===============================================================================
# Scene_Map class
#===============================================================================
class Scene_Map
  #-----------------------------------------------------------------------------
  # update method, smooth antilag has been added
  #-----------------------------------------------------------------------------
  alias f0tzis_anti_lag_scene_map_update update
  def update
    f0tzis_anti_lag_scene_map_update
    if Graphics.frame_count % 20 == 0 and $antilag.max_cpu_utilization <= 100
      # calculates difference between max utilization and current utilization
      abs = $antilag.max_cpu_utilization - $antilag.get_cpu_utilization
      # changes Frame Rate if difference is bigger than the tolerance
      if abs.abs >= $antilag.max_cpu_utilization * $antilag.cpu_tolerance/100.0
        Graphics.frame_rate = [[10, Graphics.frame_rate + abs / 2].max, 40].min
      end
    end
  end
end
#==============================================================================
# Game_Event Class
#===============================================================================
class Game_Event
  #-----------------------------------------------------------------------------
  # for AntiLag, decides, if an event is on the screen or not.
  #-----------------------------------------------------------------------------
  def in_range?
       
    # returns true if $event_antilag is false or the event is an
    # Autostart/Parallel Process event or it has an empty
    # comment in the first line
    if not $antilag.event or (@trigger == 3 or @trigger == 4 or
    (@list != nil and @list[0].code == 108 and @list[0].parameters == ['']))
      return true
    end
         
    screne_x = $game_map.display_x
    screne_x -= 256
    screne_y = $game_map.display_y
    screne_y -= 256
    screne_width = $game_map.display_x
    screne_width += 2816
    screne_height = $game_map.display_y
    screne_height += 2176
   
    return false if @real_x <= screne_x
    return false if @real_x >= screne_width
    return false if @real_y <= screne_y
    return false if @real_y >= screne_height
    return true
           
  end
  #-----------------------------------------------------------------------------
  # update method
  #-----------------------------------------------------------------------------
  alias f0tzis_anti_lag_game_event_update update
  def update
    return if not self.in_range?     
    f0tzis_anti_lag_game_event_update
  end
 
end
#===============================================================================
# Sprite_Character Class
#===============================================================================
class Sprite_Character < RPG::Sprite
  #-----------------------------------------------------------------------------
  # update method, parameters added for Loop_Map, rebuild for 8dirs
  #-----------------------------------------------------------------------------
  alias f0tzis_anti_lag_sprite_char_update update
  def update
    return if @character.is_a?(Game_Event) and not @character.in_range?
    f0tzis_anti_lag_sprite_char_update
  end
 
end
#===============================================================================
# Settings
#===============================================================================
$antilag.max_cpu_utilization = 70 # the maximum CPU utilization, the script
                                  # try to stay under this value during changing
                                  # changing the frame rate. The lower this
                                  # value the higher will be the lag reduction
                                  # (and the smoothness, too), a value > 100
                                  # will disable this feature completely
$antilag.cpu_tolerance = 20      # this value tells the script how many % of
                                  # the CPU utilization change should be ignored
                                  # If you change it too a higher value you,
                                  # your Frame Rate will be more constant but
                                  # smaller lags will be ignored.
$antilag.high_priority = true    # set this to true if you want the game to run
                                  # on high priority
$antilag.event = true            # set this to true to enable normal anti-lag
#===============================================================================
# Interpreter Class
#===============================================================================
class Interpreter
  #-----------------------------------------------------------------------------
  # * Script
  #-----------------------------------------------------------------------------
  def command_355
    # Set first line to script
    script = @list[@index].parameters[0] + "\n"
    # Loop
    loop do
      # If next event command is second line of script or after
      if @list[@index+1].code == 655
        # Add second line or after to script
        script += @list[@index+1].parameters[0] + "\n"
      # If event command is not second line or after
      else
        # Abort loop
        break
      end
      # Advance index
      @index += 1
    end
    # Evaluation
    result = eval(script)
    #---------------------------------------------------------------------------
    # If return value is false
    # NEW: the last word of the code mustnt be false!
    #---------------------------------------------------------------------------
    if result == false and script[script.length-6..script.length-2] != 'false'
      # End
      return false
    end
    # Continue
    return true
  end
end