Construyendo video juegos multi plataforma para la nubeChris SchalkDeveloper Advocate

Let's start with a Demo!

Introducing ForPlay!A GWT abstraction layer for games

● 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/forplay

Introducing ForPlay!A GWT abstraction layer for games

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

Components of ForPlay!

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

Components of ForPlay!

Just implement ForPlay.core.Game

Components of ForPlay!

Easy to write code to handle common input devices

Components of ForPlay!

Images are handled via the ForPlay Layering system

Components of ForPlay!

Game resources are preloaded using the assetManager

Time for some more demos!

ForPlay Cross Platform Magic

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

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

Other ForPlay 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 (Forplay)

ForPlay 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 ForPlay and build a game! ○ http://code.google.com/p/forplay/

Q&A@cschalk

Muchas Gracias!@cschalk