Gosu::Window#tick doesn't raise error.

By Andrek Date 2021-04-22 17:07

I'm working with Event Machine and Gosu so i'm using Gosu::Window#tick to make them work together and everything is fine till a error occurs in Gosu Loop(tick) and doesn't raise it and the Gosu::Window get bugged, i can't debbug my code so i'm stuck!

Sample code:

require 'eventmachine'
require 'gosu'

class Window < Gosu::Window
  def initialize
    super(640, 480)
  end
  def update
    0 / 0 # Generate error.
  end
end

$window = Window.new

EM.run do
  EM.add_periodic_timer(1 / 60.0) { $window.tick }
end

I'm following Using EventMachine with GTK+ and Using EventMachine with Qt
so i think this is the correct way.

Note: EM.add_periodic_timer is not a thread so Gosu::Window#tick can work correctly.

By cyberarm Date 2021-04-24 13:24

Thanks for reporting this issue Andrek!
I've submitted a patch to Gosu that should resolve this issue.

https://github.com/gosu/gosu/pull/594

By Andrek Date 2021-04-24 13:30

Thanks! I'll wait for that, while I have the solution that I said rencently.

By cyberarm Date 2021-04-24 13:45

You can add this patch directly to your Gosu::Window subclass without needing to wait for a release:

require 'eventmachine'
require 'gosu'

class Window < Gosu::Window
def initialize
super(640, 480)
end
def update
0 / 0 # Generate error.
end

alias_method :tick_internal, :tick
def tick
tick_internal

if defined? @_exception
raise @_exception
end
end
end

$window = Window.new

EM.run do
EM.add_periodic_timer(1 / 60.0) { $window.tick }
end

By Andrek Date 2021-04-26 13:50

Back to working with this, i checked the pull request and use that version instead this because i'm using Ruby 3.

Thanks a lot :)

By Andrek Date 2021-04-24 13:25

I tested Gosu::Window#tick alone and realized that is its fault and EventMachine has nothing to do here, for now i'm catching errors in Gosu::Window#update by my self using this:

require 'eventmachine'
require 'gosu'

class Window < Gosu::Window
  def initialize
    super(640, 480)
  end
  def update
    begin
      0 / 0 # Generate error.
    rescue => e
      p e
      self.close
      EM.stop
    end
  end
end

$window = Window.new

EM.run do
  EM.add_periodic_timer(1 / 60.0) { $window.tick }
end

Is there a way to check if Gosu::Window is closed? want to:
EM.add_periodic_timer(1 / 60.0) { $window.tick unless $window.closed? }