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Viewing 1 to (13 Total) NME app has lower performance on iOS than on other platforms - why? |
Total Posts: 8
Joined: April 14, 2012
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I've got a tiny game prototype with about 20-30 sprites. FPS is set to 60 in the NMML file. It runs very smooth when I build for Mac or when I run the iOS build in the iPad simulator. But when I run it on my iPhone 4S, it has a low performance and jittery movement.
I update my animation using an Event.ENTER_FRAME event handler (I had a timer running at 1000/60 but took that out in case that was the problem).
Does anybody know why this might be happening?
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Posted on April 16, 2012 at 2:13 PM
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Total Posts: 262
Joined: September 08, 2011
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Re: NME app has lower performance on iOS than on other platforms - why?
Desktop performance is always going to be considerably better than on the device. Simulator performance is a bit random - sometimes slower, sometimes faster. In both cases they won't represent the final performance.
If it's faster on the simulator I guess there is a CPU bottleneck involved:
Avoid software-bound features (filters, blendmodes, masks) which will force things to be composited in software and obviously kill the performance on mobile.
Then performance will depend on the size of the elements and if you are using batching to draw them (Tilesheet). Batching greatly improves performance.
Also definitely use ENTER_FRAME and make sure the elements movement is independent of the framerate - ie. move elements according the the elapsed time. Tween engines (like Actuate) do it well and keep everything smooth even if the framerate would fall dramatically.
Related (shameless but useful plug):
http://speakerdeck.com/u/elsassph/p/haxe-nme-vs-the-world... (check slides 23+)
Posted on April 16, 2012 at 2:31 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
I use no effects whatsoever. It's a super-tiny project. It just moves 20-30 sprites, 88x88 pixels.
I was going to use framerate-independent movement but started off with a lazy implementation, because I assumed ENTER_FRAME would be called 60 times per second anyway with so little going on.
I am not claiming to be extremely knowledgeable about Flash/Haxe/NME performance or to have coded the most optimal way but this just seems weird to me.
I have a second mini-app that moves a bitmap over the entire screen and that's smooth as butter.
Posted on April 16, 2012 at 2:35 PM
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Total Posts: 262
Joined: September 08, 2011
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Re: NME app has lower performance on iOS than on other platforms - why?
Can you show the code then if it's a little sample?
20-30 sprites is a case for using a batch anyway.
Posted on April 16, 2012 at 2:40 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
Sure. It's right here:http://pastebin.com/NWAAH0Rn
Gem derives from Sprite and has a Bitmap added to it.
Posted on April 16, 2012 at 2:41 PM
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Total Posts: 262
Joined: September 08, 2011
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Re: NME app has lower performance on iOS than on other platforms - why?
Hum, did you read what I said previously?
You are using a mask -> BAM! software for all this render path.
"gemContainer.mask = maskRect;"
Other usual suspect to use with care: .cacheAsBitmap explicitly sets software rendering.
Posted on April 16, 2012 at 2:53 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
I read it but I didn't understand it  That's exactly the kind of stuff I don't know. I set a mask because I want to clip the gems and this seemed the easiest way of doing it.
I did in the mean time read your slides and got the hint about GPU > CPU on mobile and how that probably means ignoring a lot of Flash desktop performance hints. Not that I know many of those ;)
Thank you very much for taking the time to help me!
Posted on April 16, 2012 at 3:06 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
So I've switched to Tilesheets but no matter what I try the sprites look like this:
http://picpaste.com/Screen_Shot_2012-04-16_at_11.09.23_PM-nyvnKbVW....
The original sprite sheet is 512x128, each sprite is 128x128. I am not using smooth, scale, rotation or alpha. I've tried stripping it down to one rectangle and one tile but the effect remains.
Do you know what could be causing this?
Posted on April 16, 2012 at 4:13 PM
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Total Posts: 262
Joined: September 08, 2011
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Re: NME app has lower performance on iOS than on other platforms - why?
How did you create the spritesheet? Try reencoding the PNG differently.
Posted on April 16, 2012 at 4:22 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
Using ImageMagick montage. Is there any particular kind of PNG I should / should not use?
Posted on April 16, 2012 at 4:37 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
Ah, I guess 16 bit/pixel PNGs are not so useful... Now to fix the alpha channel somehow.
Posted on April 16, 2012 at 4:44 PM
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Total Posts: 262
Joined: September 08, 2011
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Re: NME app has lower performance on iOS than on other platforms - why?
TexturePacker is worth every cent and works on all 3 platforms.
http://www.texturepacker.com/
Posted on April 16, 2012 at 4:52 PM
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Total Posts: 8
Joined: April 14, 2012
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Re: NME app has lower performance on iOS than on other platforms - why?
Thanks for the recommendation. I'd heard of it, but wanted a quicker solution... The sprites show fine except for the alpha. I'll figure it out
Posted on April 16, 2012 at 4:54 PM
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