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This is a presentation on how to build multi-platform (HTML5, Flash, Java/Android) video games using an open source technology known as Forplay (PlayN).This presentation was delivered in Mexico City on Aug 9th, 2011 at the "EstoEsGoogle" aka Devfest Mexico event on Aug 9th in Mexico City by Google Developer Advocate Chris Schalk
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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