Begin with Cocos2D - Initial problems and reason to use cocos2D

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Begin with Cocos2D - Initial problems and reason to use cocos2D

(14 posts) (7 voices)

Started 2 years ago by badawe
Latest reply from leanhtai

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badawe
Member

Hey Guys! I new at cocos2d world, and very new to iPhone development to!I was a flash developer for 3 years, and in the last 5 months, i begin the iphone development, I do 2 applications with interface builder for clients, and now i really want to do a little game, is quite simple, a match 3 game! I made the first engine in interface builder, and seens good to me! But after i read some posts, i really want to try it in the cocos2D! So, in 2 days i rewrite all my first engine for cocos2D, very annoying upsidedown coordinates but ok, after many problems and workarounds i do it! But the performance side by side with interface builder version is really scare! Many Many slow downs at the cocos2d side! And the animation seens bugged to me! I really scare! I really don't know what is the best choice for a simple game. And i want some opinions:

The engine i talk about, its just a test, i load a few jpg into Sprite for each new Block at grid! The same thing in both cases (Interface Builder / Cocos2D) And the IB version, is very very faster than the cocos2D, i know when i gonna do this game if i going to do this some day, i need load all my jpgs only once, by now i load a new jpg for each new block. This can be the problem? The interface builder version manage this laoded images better?

When is the best case to use cocos2d? When need some physics? When we have many objects at screen? What is the performance boost i have with cocos2D?

I have how to share this 2 applications with you guys?! Without your UID?!

Sorry about my bad english!

Posted 2 years ago #
ob1
Member

Hi,

I don't think it's normal that the cocos version of your game is much slower. My game can have around 200 sprites on screen I think and run fine.

Simple mistakes or problems can cause huge slowdowns though (like personally I had a full screen clip layer that kill my performance at some point).

I think that although Cocos still has some problems (but a lot have been fixed in the 0.8.0 branch) it's a very good platform to develop games on. It works fine with many sprites on screen.

Personally I don't use physics engines and I think that unless you want funny stuff like ragdolls, gravity and complex collisions, it's juste far more simple to do it by hand.

Posted 2 years ago #
bradparks
Member

Maybe it's your JPG's.... Using images that are too big / high bit can suck up alot of memory and cause poor performance. In the Best Practices guide on the wiki it talks about this:

http://www.cocos2d-iphone.org/wiki/doku.php/prog_guide:best_practices

Here's some of what it says:
- When possible, try to use 4-bit or 16-bit textures
- 16-bit textures for PNG/GIF/BMP/TIFF images
- For 4-bit or 2-bit textures: Try to use PVRTC textures.
- Use 32-bit textures as the last resort

Hope it helps!

Brad

Posted 2 years ago #
abitofcode
Moderator

Are you using Sprites or AtlasSprites? http://www.cocos2d-iphone.org/forum/topic/1234

Posted 2 years ago #
artem
Member

Ccocos2d!!

Posted 2 years ago #
Steve Oldmeadow
Administrator

"by now i load a new jpg for each new block. This can be the problem?"

Yes, that would cause performance problems. Look at AtlasSprites as others suggested and you will find the cocos2d performance kills the interface builder version. Have a look at some games that use cocos2d if you have any doubts, many have lite versions that you can try for free.

Posted 2 years ago #
badawe
Member

Guys! Thanks for all advice! I really give one more try to cocos2d, is definitively my mistake.

Now i want some tips for how is the best way to manage all this AtlasSprite!

I have one GameplayScene(Scene) ! Inside of that i have one GameplayLayer(Layer) and inside of that i have one GridManager(Layer) this GridManager, load all of my blocks (Sprites) and each one of then load jpg files individuality.

The best choice is:
- Have one Manager (Layer / Sprite / Whatever) at GameplayScene, load all of my jpg here, and when i need create some block, i get a clone of one of this sprites? Somewhere i have one example of what is the best way to access this jpgs? Getting a clone i not load image again right?

Posted 2 years ago #
Steve Oldmeadow
Administrator

@badawe - look at the AtlasSprite demo and particularly look at the images it works with. You will end up creating a single image (often referred to as texture atlas or sprite sheet) that contains all your current jpg block images.

Posted 2 years ago #
badawe
Member

Thanks @Steve i already starting learn with this demos! But the starting question for me, is how i can reutilizes some AtlasSrite?! I have some 4 blocks each of one with some animations inside. I need use some of then many many times! How is the best way i can do that?

Posted 2 years ago #
Steve Oldmeadow
Administrator

You don't reuse the AtlasSprites. Create one for each block. Think of an AtlasSprite as an instruction to draw a part of an image at a specific rectangle on the screen - for every sub image->rectangle you want to draw you need an AtlasSprite. You can easily draw 100 AtlasSprites which is enough for a 10x10 match 3 game.

Posted 2 years ago #
badawe
Member

@Steve, I really get the point, but i dont know if is my organization in the code, but i can't understand what is the best method to do what i want, i can send to you my code for you take a look?!

Posted 2 years ago #
badawe
Member

Guys i make some stuff and start learning how work with this AtlasManager! But by now my problem is:

I Don't want reload my atlasManager everytime i have a new block, but i can add AtlasSprite outside of my AtlasSpriteManager! How i can work with that? what is the best way to make this things work?!

I Have one GridManager this load several classes (Extend Sprite) and all other informations about my blocks.

I have how load my AtlasSpriteManager, and add the target AtlasSprite, inside one of my blocks?

Posted 2 years ago #
Steve Oldmeadow
Administrator

@badawe - I don't understand what you are saying, maybe post some code. You don't need to reload AtlasSpriteManager for every new block. You could also look at the Box2DAccelTouchTest example, this uses an AtlasSpriteManager for some blocks.

Posted 2 years ago #
leanhtai
Member

Hi everyone. I have something not clear in this line of code . Can anyone explain it to me , i really appreciate the helps

[[TextureMgr sharedTextureMgr] removeUnusedTextures];

It used to remove images rite? but when and how does it do the removing.? And How to apply this to the code correctly?

Posted 2 years ago #

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