Creación de video juegos en la nube(How to Build Kick Ass Games in the Cloud)

Chris SchalkGoogle Developer Advocate

Let's start with a Demo!

Introducing PlayN!An abstraction layer for games (Formerly ForPlay)

● A small API for building fast cross-platform games

● Core game code can be platform agnostic

● Develop games in Java○ Familiar language/toolset

● Is compatible with GWT○ Compiles to JS/HTML5, (among other platforms)

● Free and Open Source (alpha)○ http://code.google.com/p/playn

Introducing PlayN!A GWT abstraction layer for games

Implementations for Java, HTML5(GWT/JS), Android, Flash

PlayN API

Components of PlayN!

Fully generic gaming components. Core game logic is fully platform independent!

Implements core.Game PlayN.*

Components of PlayN!

Just implement PlayN.core.Game

Components of PlayN!

Easy to write code to handle common input devices

public void OnKeyDown( keyboard.Event event ) {

public void OnPointerEnd( Pointer.Event event ) {

public void OnPointerMove( Pointer.Event event ) {

Components of PlayN!

Images are handled via the PlayN Layering system

Components of PlayN!

Game resources are preloaded using the assetManager

Time for some more demos!

PlayN Cross Platform Magic

● Game uses core PlayN abstractions, is unaware of which platform is running

● The only platform-specific code is in the entry point for each platform:

PlayN.run(new MyGame()); PlayN.run(new MyGame());

Other PlayN Benefits

● Built-in physics engine based on proven OpenSource technologies

● Box2D○ C++ 2D Physics engine by Erin Catto

● JBox2D○ A port of Box2D from C++ to Java

● GWTBox2D○ A port of JBox2D from Java to JavaScript

Benefits of GWT Abstraction

● GWT Compiler optimizes code for size○ Removes unused code○ Evaluates when possible at compile time○ Inlines functions○ Heavily obfuscated result code

● Smaller compiled code - faster load time● Optimized caching, avoids unnecessary network IO

Benefits of HTML5 for Games

● New HTML elements○ 2D canvas○ Audio, Video

● Application Cache

● 3D Canvas (WebGL)○ Open GL ES 2.0 made JavaScript friendly

● CSS3○ Supports hardware accelerated transforms

More demos● Building your own games

○ Introducing "App Engine: Cloud Warrior"

App Engine Cloud Warrior Architecture

Google Storage

Game Assets(images/sounds)

Game ScoresProfile Data

App EngineDatastore

Game Play (PlayN)

PlayN Summary

● Open source, cross-platform game abstraction layer○ Core game logic is platform agnostic

● ForPlay abstracts away the core components of a game○ The game loop, I/O system, and asset management

● Write in familiar Java, get performance on multiple platforms

○ Superior Java development/debug○ GWT allows compilation to fast JavaScript/HTML5

● Your assignment:○ Download PlayN and build a game! ○ http://code.google.com/p/playn/

Q&A@cschalk