davidB'log

Using game_loop with dartemis

2013-09-17T22:00:00Z

Today, I replaced requestAnimationFrame + my own TimeInfo class by game_loop, you can see the commit on github.

class Game {

  final _world;
  final _renderSystem;
  final _gameLoop; 

  Game(){
    // create instance
    var container = query("#game");
    _world = new World();
    _gameLoop = new GameLoopHtml(container);
    _renderSystem = new System_RenderX(container);

    // setup instance an allow circular dependencies gameLoop <-> world'system
    _setupWorld();
    _setupGameLoop();
  }

  void _setupWorld() {
    //...
    _world.addSystem(new System_XXXX());
    _world.addSystem(new System_YYYY(_gameLoop));
    // System(s) in charge of rendering will not run when world.process()
    _world.addSystem(_renderSystem, passive: true);
    _world.initialize();
  }

  void _setupGameLoop(){
    _gameLoop.pointerLock.lockOnClick = false; // to keep mouse cursor
    _gameLoop.onUpdate = (gameLoop){
      _world.delta = gameLoop.dt * 1000.0; // world.delta in ms
      _world.process();
    };
    _gameLoop.onRender = (gameLoop){
      _renderSystem.process();
    };
  }

  void start() => _gameLoop.start();
  void stop() => _gameLoop.stop();
}

Why I moved to game_loop ?

I was happy with my previous solution, but I planned to move when I need some of its features like gamepad support, fullscreen, constant update time, … And today I need (for debug purpose) the easiest feature to implement: a frame counter. I spend more time to introduce game_loop than to implement the frame counter ;-) , but less time than implement it and replace it later.

Currently I didn’t replace the keyboard management by the game_loop, may be later.

My versionning flow

2011-05-28T22:00:00Z

VERSION_CURRENT=1.1.0
VERSION_NEXT=1.2.0
git checkout wip
git tag v${VERSION_CURRENT}
git checkout milestones
git merge --no-ff v${VERSION_CURRENT}
# build
git push origin milestones
git checkout wip
# change version number
git commit -avm "init version ${VERSION_NEXT}"
git ush origin wip

In the specific case of ScalaIDE I use the following information to manage the 1.x.y versions.

wip => wip_exp_backport
build =
  cd org.scala-ide.build
  ./build-ide-local-2.8.1.final.sh
change version number =
  cd org.scala-ide.build
  ./set_version.sh ${VERSION_NEXT}-SNAPSHOT
  grep -r ${VERSION_CURRENT} ../**/pom.xml
  grep -r ${VERSION_CURRENT} ../**/MANIFEST.MF
  # build and fix any issue related to version modification

Eclipse/OSGi : from Require-Bundle to Import-Package

2010-11-25T23:00:00Z

Yesterday, I spend too many time to convert Require-Bundle to Import-Package into MANIFEST.MF of eclipse bundles. For some various cause, I can’t do it with PDE, so I don’t know if there is assistant or not in PDE. I did it manually (try and catch) : edit, build with tycho, install plugins, restart, try until I’ve got NoClassDefFoundExceptions.

Until I’ve got the idea (late for the last plugin) : using a package analyzer to have the full list of package used by the bundle. In my case I use JDepend (as I failed to download it, I use a version in my maven local repository) :

java -cp  ${HOME}/.m2/repository/jdepend/jdepend/2.9.1/jdepend-2.9.1.jar \
  jdepend.textui.JDepend \
  org.scala-ide.sdt.compiler.ext/target/classes

At the end of the report there is the list of packages :

--------------------------------------------------
- Package Dependency Cycles:
--------------------------------------------------


--------------------------------------------------
- Summary:
--------------------------------------------------

Name, Class Count, Abstract Class Count, Ca, Ce, A, I, D, V:

java.io,0,0,1,0,0,0,1,1
java.lang,0,0,1,0,0,0,1,1
scala,0,0,1,0,0,0,1,1
scala.collection,0,0,1,0,0,0,1,1
scala.collection.generic,0,0,1,0,0,0,1,1
scala.collection.immutable,0,0,1,0,0,0,1,1
scala.collection.mutable,0,0,1,0,0,0,1,1
scala.collection.script,0,0,1,0,0,0,1,1
scala.math,0,0,1,0,0,0,1,1
scala.reflect.generic,0,0,1,0,0,0,1,1
scala.runtime,0,0,1,0,0,0,1,1
scala.tools.nsc,0,0,1,0,0,0,1,1
scala.tools.nsc.ast,0,0,1,0,0,0,1,1
scala.tools.nsc.dependencies,0,0,1,0,0,0,1,1
scala.tools.nsc.interactive,180,13,0,22,0,07,1,0,07,1
scala.tools.nsc.io,0,0,1,0,0,0,1,1
scala.tools.nsc.reporters,0,0,1,0,0,0,1,1
scala.tools.nsc.settings,0,0,1,0,0,0,1,1
scala.tools.nsc.symtab,0,0,1,0,0,0,1,1
scala.tools.nsc.typechecker,0,0,1,0,0,0,1,1
scala.tools.nsc.util,0,0,1,0,0,0,1,1
scala.util,0,0,1,0,0,0,1,1
scala.util.control,0,0,1,0,0,0,1,1

So I convert

Require-Bundle: org.scala-ide.scala.compiler

into

Import-Package: scala.tools.nsc,
 scala.tools.nsc.ast,
 scala.tools.nsc.dependencies,
 scala.tools.nsc.io,
 scala.tools.nsc.reporters,
 scala.tools.nsc.settings,
 scala.tools.nsc.symtab,
 scala.tools.nsc.typechecker,
 scala.tools.nsc.util

(Tips to not forgot)

Pomodoro technique

2010-11-02T23:00:00Z

J’essaie de suivre la “pomodoro technique”, et je la trouve tres efficace quand je l’applique correctement. Pour en savoir plus voici quelques liens :

Il y a plein de pomodori/minuteurs informatique +/- utiles suivant l’usage et l’utilisateur. J’utilise (teste) actuellement : pomodairo, il a fallu un peu hacker pour que adobe air fonctionne sous mon Linux. J’utilise aussi un gestionnaire de tâches (et sous-tâches) en ligne : todoist (il n’est pas spécifique à “pomodoro technique”)

Linux : Gmrun alternatives

2010-10-11T22:00:00Z

Alternatives

Gnome-Do
Launchy (Linux + Windows)
Kupfer
Bashrun
[Gnome panel run dialog] : gnome-panel-control --run-dialog
[LXPanel run dialog] : lxpanelctl run
[Dmenu] : dmenu_run