cocos2d for iPhone

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

1. 

   oscarmk
   Member

   Hello,

   So let's say the user completed level 1 of your game, and now you are about to present a level 2 to the user. What do you have to clean up assuming you are using chipmunk?.

   As far as I understand cocos2d when you call pushScene to go to your next level, I assume you first have to free all the chipmunk objects, and then the Scene automatically releases all of its retained objects and calls dealloc?. is this correct?.

   Also once your new Scene/level is loaded you should also call [[TextureMgr sharedTextureMgr] removeUnusedTextures]; is this correct?

   Thank you.

   -Oscar

   Posted 7 months ago #
2. 

   lyeandro2587
   Member

   I still think you need to release all declared retained objects.

   Posted 7 months ago #
3. 

   hactar
   Member

   Oscarmk, read up on the difference between pushScene and replaceScene, because pushScene is not going to do what you expect it to do.

   replaceScene will call a release on your level 1 scene. Assuming there is nothing else retaining your level 1 scene then your scene dealloc method will be called, and so anything you release there will also be released.

   Once your old scene is completely removed then you can run [[TextureMgr sharedTextureMgr] removeUnusedTextures]; Careful when using transitions, as calling removeUnusedTextures during a scene transmission will not remove the old scenes textures: these are still in use. I suggest using instruments to measure if unusedTextures is actually removing anything. It took me a while to find the correct spots to call it in my code.

   Posted 7 months ago #
4. 

   hactar
   Member

   PS: a great way to see when and how dealloc works is simply adding NSLog(@"dealloc called!"); to your dealloc method. If for some reason you find an object is not being dealloced as expected, add this code to the object/scene/whatever that is not being dealloced:

   - (oneway void)release
   {
   	NSLog(@"Object retain count will become: %d", [self retainCount] -1);
   	[super release];
   }

   This will show you your retain count whenever this object gets a release message and so will help you see just how many objects are retaining your object.

   Posted 7 months ago #
5. 

   David994A
   Member

   It seems that you would want to call [[TextureMgr sharedTextureMgr] removeUnusedTextures]; at the start of a new scene using the -(void) onEnterTransitionDidFinish; method

   Posted 7 months ago #
6. 

   napierzaza
   Member

   Doesn't it still retain textures from the first level unless you clear them? That's my experience, mind you, it could be good for you.

   Posted 6 months ago #
7. 

   oscarmk
   Member

   @lyeandro2587: Thank you for your input, yes I am aware that I need to release anything that is retained by something else than the layer. As I believe Layers work pretty much like UIView in the sense than when they are deallocating anything they are retaining with retain count of 1 is deallocated.

   @hactar: My mistake i actually wanted to say replace Scene, I do know the difference. Thank you I will try that NSLog to maek sure it is going to be deallocated.

   @David994A: Yes that is where I am calling it, Is that the best practice?

   So what about the chipmunk objects what do you have to do to release all of those?. Right know I am doing to remove an object when it is no longer needed this 4 lines although I am not sure you actually need all those 4...

   cpSpaceRemoveBody(space, objectBody);
   		cpBodyFree(objectBody);
   		cpSpaceRemoveShape(space, objectShape);
   		cpShapeFree(objectShape);

   I think you really only need to free them or do you have to remove them first too?

   I know there is cpRemoveAllChildren or something of the sort and cpSpaceFree is that what you need to call before to clean up all chipmunk objects?

   Posted 6 months ago #
8. 

   oscarmk
   Member

   So what about chipmunk?, how do I free all the objects and the space?

   Posted 6 months ago #
9. 

   mobilebros
   Moderator

   @oscarmk - Just free all the objects in the space, and then the space itself

   cpSpaceFreeChildren(_space);
   cpSpaceFree(_space);

   Posted 6 months ago #
10. 

    oscarmk
    Member

    Thank you mobilebros.

    Posted 6 months ago #
11. 

    abitofcode
    Moderator

    Between levels you may not want to remove all your textures using

    [[TextureMgr sharedTextureMgr] removeUnusedTextures];

    but just the ones that are level specific as discussed here http://www.cocos2d-iphone.org/forum/topic/4245

    Posted 6 months ago #

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