cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   penguins
   Member

   Hello again,

   I was working on my game, nothing that complicated going on yet, and I decided to test it on my actually phone (3g, running 3.0). I got really unhappy results, of around 30-25 fps.

   I have literally like 3 objects(imgs, and a bodys with a shapes attached) on the screen.

   I tried switching off the tilemap, nothing, tried removing bodies, nothing, I think it might be something to do with chipmunk.

   I am wondering if anyone else has run into this issue, and or solved it.

   I tested some of the sample code (chipmunk test mostly), and I get literally 1.7 fps on the second chipmunk demo on the phone.

   I did try and use shark, and instruments on it, but I didn't really know what I was looking for, so that led me nowhere.

   More info,
   I am running cocos2d 8.0
   And the trunk version of chipmunk2d, but the slowness occurs with what was the default in cocos2d.

   Thanks for the help.

   Posted 2 years ago #
2. 

   Cypher
   Member

   Just as a comparison point, have you tried running the Chipmunktest on the phone? If that behaves just as bad, then maybe you can dig deeper there. If not, it might be something else..

   Regards

   Posted 2 years ago #
3. 

   friken
   Member

   hmm.. performance could be a number of things. I've had times when my iphone itself seems to be doing some serious background processing, seemingly having to do with bluetooth and 3.0 release. Turning bluetooth off helps, but once it happens only a reboot seems to really fix it. Also, if you have a gameloop of any form be really sure you aren't doing something per-frame update that you don't have to.

   For a comparison point, the project I'm working on is solid at 50-60fps with about 30 sprites, single atlasmanager with a single 1024x512 texture. It also uses a few particle emiters, but with highly reduced particle count compared to the defaults (like 50-100 particles instead of 1000).

   I do not have any chipmunk or box2d going.

   Posted 2 years ago #
4. 

   penguins
   Member

   Thanks for the help. I think it might be the chipmunk querying the space for all bodies to render, or something like that. Will defiantly check out my game loops, to see what I can delete/Delete everything in the loops that is unneeded.

   As for the bluetooth, it was already disabled. After a reboot of the phone, there is not really any noticeable difference. But good idea.

   @cypher, the 20 FPS only show up on the phone. All the tests above where on the phone. In the simulator, i get around 60. Sorry if I was unclear.

   A random aside, I put a lot of my chipmunk variables in a singleton class. Will that slow anything down? I am not sure about the performance of properties(the getters and setters) in object-c, or how it interacts with chipmunk. That shouldn't really affect anything right??

   Thanks

   Posted 2 years ago #
5. 

   pabloruiz55
   Member

   hi!

   I thinks there must be something wrong in your game. When i started using chipmunk i had a similar problem and it was because i was moving my sprites outside of the screen at the same place, so they would all be colliding.

   There might be some problem in the gameloop, some unintended processing, i don't think it has to do with the device since at least in my experience 60 fps in the simulator is bad enough.

   At least in my game: 50-60 fps in 3g device -----> more than 110 fps in simulator. (using chipmunk, 30 sprites, 3 particle systems)

   Posted 2 years ago #
6. 

   pabloruiz55
   Member

   Ahh try tweaking the chipmunk space configuration. Reduce iterations and elastic iterations for example.

   Also disable "compile for thumb" in your project's configuration. This should give you a considerable boost in performance.

   Posted 2 years ago #
7. 

   penguins
   Member

   Wow, I got it, thanks aton, I did everything you said above, removed Everything excess, And just about everything from my step, and it works perfectly. 60fps through out. The comparisons are also nice. I now have something to base my stuff on.

   My space configurations are changed. I also removed all the excess line segments not being used. (static bodies).

   //space configurations
           cpSpaceResizeActiveHash(space, 100, 40);
   	cpSpaceResizeStaticHash(space, 100, 40);
   
   	space->iterations = 5;

   Thanks a ton again.

   Posted 2 years ago #

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