Show HN: Ejecta, A Fast, Open Source JavaScript, Canvas Implementation for iOS

http://impactjs.com/ejecta

by phoboslab • 14 years ago

190 45 14 years ago

impactjs.com

dsirijus• 14 years ago

Pretty cool.

What about the support for Android, any plans for that?

phoboslab4• 14 years ago

This project is very much iOS specific. It's written in Objective-C and uses JavaScriptCore (Apple's JS engine). So porting this over to Android would be a lot of work.

But have a look at CocoonJS; it's cross platform (but closed source): http://ludei.com/tech/cocoonjs

kylebrown• 14 years ago

I was curious about that too. With android support, it would be a good alternative to Corona (use js instead of Lua).

For iOS, an added benefit of is that JavascriptCore uses Nitro, unlike UIWebView.

jevinskie• 14 years ago

JSC as used by an app store app does not use Nitro. As the post stated, JSC is a private framework and the only way to use it in an approved app is to import the source into your project and build a copy of JSC that is bundled with your app. Since the JSC that you use is contained within your executable, iOS doesn't allow the write and execute permissions in memory that would be necessary for JIT.

grimboy• 14 years ago

Any actual benchmarks?

phoboslab4• 14 years ago

I haven't done any formal benchmarks. A quick test with 1000 sprites runs with 60fps on the iPhone4s.

Also try loading this in Mobile Safari and compare it to the video: http://www.phoboslab.org/crap/bezier/

rabidsnail• 14 years ago

The word "Ejecta" sounds dirty. I feel weird just typing it.

antidaily• 14 years ago

You're probably not old enough to have had a walkman?

dj2stein9• 14 years ago

This looks like a great way to build iOS games in HTML5.

If he could to get this to work as an Android project it could be used to build games for OUYA.

phoboslab4• 14 years ago

Thanks for the great response so far!

I also wrote about some implementation details of the Canvas API and the challenges with OpenGL in my blog:

http://www.phoboslab.org/log/2012/09/ejecta

mrspeaker• 14 years ago

Thanks very much for open sourcing this. Keep up the good work - everything you post is great... great information, and great code. Thanks again!

evmar• 14 years ago

Have you seen Plask? (http://www.plask.org/) What are your thoughts on it? I guess it doesn't target OpenGL, but I imagine it's pretty fast already...

acron0• 14 years ago

Bugger. There goes my pet project. Nice one phoboslab!

programminggeek• 14 years ago

ImpactJS is a fantastic tool and Ejecta solves a real problem in a smart way. Phobos Lab does awesome work.

firlefans• 14 years ago

This guy is a hacker in the truest sense, I read a blog post over a year ago about him tinkering away on this. It didn't seem he'd take it this far. It's a great achievement and I'm glad he's been insightful enough to keep it free.

yesimahuman• 14 years ago

I used Impact two years ago on something and I was so impressed with the API simplicity and power (not to mention the fact that it ran very well). This guy does great work.

imaffett2• 14 years ago

Dominic is amazing at what he does. ImpactJS is such a powerful but simple tool. I love that every release is NOT bloatware, but carefully thought out feature enhacements.

drcode• 14 years ago

Any plans on making it usable without XCode? (or a Mac, for that matter.)

Since the users just write javascript code, as long as you give them a way to insert that code into an app, they wouldn't really need to use the XCode build system at all (I know, app store rules would need to be addressed...)

imaffett2• 14 years ago

DirectCanvas from appMobi (I work there) is based on iOS impact (and enhanced) - http://www.appmobi.com . No need for a Mac or XCode.

arturadib• 14 years ago

Interesting! I created Node-Five with a similar goal in mind (low-level graphics and audio from the HTML5 spec):

http://documentup.com/arturadib/node-five

Glad to see someone had the same idea for iOS :)

soapdog• 14 years ago

I purchased ImpactJS after picking the "Creating HTML5 Games" book about it. I was really surprised with the quality of the toolkit and how responsive the developer is. I think it was the best investment I made this year and I can't wait to release some games.

city41• 14 years ago

I'm very happy with impact. It's well designed and easy to extend. After quite a bit of exploring different frameworks and engines (including writing my own), I think impact is my long term game dev solution.

wsc981• 14 years ago

Just wanted to tell this is some really cool work you've done.

jaipilot7472• 14 years ago

That the canvas API is implemented with OpenGL is very impressive. CocoonJS [1] (a similar project for Android, as noted in the comments below) seems to have taken the same approach.

On a completely tangential note, given that the main desktop browsers now sport hardware accelerated canvas implementations, is there a performance difference in 2D graphics rendered with canvas vs. WebGL?

[1] http://ludei.com/tech/cocoonjs

spot• 14 years ago

webgl can be much faster because you can draw many primitives with one call. there's a lot of overhead from js down to gl.

jaipilot7472• 14 years ago

Then what is stopping browser vendors from implementing canvas directly in gl directly, making canvas more or less a wrapper?

SunboX• 14 years ago

Really great work! One question belonging to this, do you know how to used 4x5 ColorTransform Matrices with JavaScript and WebGL/OpenGL? I can't find anything about this on the I-net.

matthuggins• 14 years ago

As far as I am aware, ImpactJS is unfortunately only for tile-based game development on canvas. Has this influenced/limited Ejecta in any way?

TazeTSchnitzel3• 14 years ago

I want this in the browser. Throw away the DOM, and let's just have canvas and JS. Skip loading any HTML or CSS. It would be great.

erichocean• 14 years ago

That's pretty much exactly what Blossom[1] is; there's no need to write HTML or CSS.

[1] https://github.com/erichocean/blossom

TazeTSchnitzel3• 14 years ago

Yeah, but I'm thinking having the current W3C APIs.

wwweston• 14 years ago

In fact -- why do we even have browsers?

If only there were some popular write-once run-anywhere VM, we could pretty easily get away from this weird document-oriented web thing forever.

TazeTSchnitzel3• 14 years ago

Yeah, like Java. :P

kevingadd2• 14 years ago

Isn't JS performance going to suffer if it's using a custom build of JSC that can't JIT?

killahpriest• 14 years ago

Native iOS doesn't have JIT

kevingadd2• 14 years ago

The browser certainly does. Or is this only an alternative to a WebView in an app store app?

phoboslab4• 14 years ago

Yes. I wish we could use the JIT – it would make computational heavy stuff way faster. Most games however aren't performance bound by computation, but by drawing. Not having the JIT isn't as bad as it may seem.

Also, JavaScriptCore recently features a new "low level interpreter" – still not as fast as the JIT, but way faster than it was a few month ago: http://wingolog.org/archives/2012/06/27/inside-javascriptcor...

wklauss• 14 years ago

Reminds me of CocoonJS (basically the same idea, also support for Android but closed source).

https://vimeo.com/45506217

Neat in any case. Looks like a nice implementation.

tlrobinson• 14 years ago

Cool. This sounds a bit like Game Closure (http://gameclosure.com/)

vicapow2• 14 years ago

Apple needs to just buy you out right and include this in safari.

icemelt8• 14 years ago

The quicker you guys realize it the better, Flash is the better choice.

Show HN: Ejecta, A Fast, Open Source JavaScript, Canvas Implementation for iOS

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