Target pre-3GS Devices? « cocos2d for iPhone

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Target pre-3GS Devices?

(38 posts) (14 voices)

Started 11 months ago by akasurreal
Latest reply from Webtopia

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Dragyn
Member

@Webtopia: I hadn't seen it mentioned in this thread, and I've seen a lot of people bitten by that one, so I felt obligated to bring it up.

I don't have a 3G to test on, and I haven't seen anything like this firsthand. So if you run it on the 3G when it's NOT tethered to your machine, do you have any problems with the slowdown? I'd test the heck out of it running untethered by itself, and see if you get the symptoms again. If you try it dozens (or hundreds?) of times in standalone mode and don't get the lag, I'd go the "Homer Simpson" route and ignore it. Running through XCode is not something your end users will be doing, so if you can't reproduce in standalone mode, you should be fine.

Posted 11 months ago #
Webtopia
Member

Yes that's right I don't have the problem when it's NOT tethered. I thought it may have still had the problem untethered sometimes. But I think it's when I shutdown the app using the home button on the device and not using the stop button in XCode (so it's essentially still tethered).

I've been forced to look at the code and troubleshoot.

My App Background:

I have a scrolling platform style game using a tilemap with a sprite that generally stays in the same position.

I am using parallax.

The parallax node contains the background image (600px wide by 400px high) and the tilemap (each tile 32px by 32px and tilemaps around 50 tiles wide and 20 tiles high. Most tiles are blank).

Troubleshooting:
Although I never get a memory warning and the memory seems fine in Instruments the app slows down when tethered when my character jumps. This is when the background and tilemap moves in the y direction. Simply scrolling in the x direction there's no problem.

If I remove the background and just use the tilemap I don't have the problem. If I untether from Xcode I don't have the problem.

So it's something to do with rendering the tilemap on a background image in debug mode.

Any ideas? Can I Homer Simpson it?

Posted 11 months ago #
Webtopia
Member

Just found this forum topic on FPS Might be best to play it safe and use 30 FPS if I can.

Posted 11 months ago #
Webtopia
Member

Sorry to fill this thread with unrelated stuff. Just found something that could be handy for people and it's on topic.

Handy Table Reference of Devices and their Specs

Posted 11 months ago #
Birkemose
Moderator

*Homer Simpson voice* Dr Samantha Waaateeeerssss

If it isn't a memory problem, and you have slowdowns, it must be your code.
I recently had a problem with glReadPixels in an app I am working on. Stalled the OGL pineline or something. If you were able to reproduce the problem somehow in the profiler, it might give you a hint to where the time is lost.

Posted 11 months ago #
Webtopia
Member

OK so my research about Samantha Waters was wrong.

I give up. What is the profiler?

I've never used it. I found reference to an OpenGL Profiler. But is that program easily used with iPhone apps? Looks like a mac OSX thing.

Or is it an option in Instruments. There's the time profiler and there's OpenGL Driver.

Posted 11 months ago #
Webtopia
Member

@Birkemose I tried using the OpenGL options in instruments but I had to upgrade to version 4 of the iOS. So I've done that now.

Can anyone help me make sense of this?

Or at least point me to a good blog to get me started. I find the apple documentation on instruments to be pretty hard to follow.

Thanks,
Travis

Posted 11 months ago #
Webtopia
Member
For those playing at home.

The depth test was causing a problem and since I didn't use the z axis of the camera I turned it off.
```
[director setDepthTest:NO];
```
Also since I have no 3D effects I thought it can't hurt to turn off 3D

[director setProjection:CCDirectorProjection2D];

This seems to have speed up my program enough to stop the jittery slow frame rate.

Thanks everyone for the tips.
Posted 11 months ago #

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