How to use CCSpriteSheet across different layers?

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How to use CCSpriteSheet across different layers?

(14 posts) (5 voices)

Started 1 year ago by FiberCore
Latest reply from araker

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FiberCore
Member

I have a CCSpriteSheet included many sprites who used in different layers. My codes like this:

In the parent layer:

CCSpriteFrameCache *cache = [CCSpriteFrameCache sharedSpriteFrameCache];
[cache addSpriteFramesWithFile:@"Stuff.plist"];
id menuBatchNode = [CCSpriteBatchNode batchNodeWithFile:@"Stuff.png" capacity:120];
[self addChild:menuBatchNode z:0 tag:1];
... ...
MyLayer *childLayer = [MyLayer node]; // MyLayer derived from CCLayer
[self childLayer z:1 tag:2];

In MyLayer :

NSString *frameName = [NSString stringWithString:@"Stuff_child.png"];
CCSprite *sprite = [CCSprite spriteWithSpriteFrameName:frameName];
... ...
id menuBatchNode = [self.parent getChildByTag:1];
[menuBatchNode addChild:sprite z:0 tag:1];

It works, but the sprite of MyLayer cannot be displayed.

If I replace
[menuBatchNode addChild:sprite z:0 tag:1];
with
[self addChild:sprite z:0 tag:1];

The sprite will display. What's wrong with these codes? Can you help me.

Posted 1 year ago #

chrisco
Member

A single spritesheet can only exist on one layer - your only options are to change your code so that all sprites are on the same layer (and in the same spritesheet) or to create a spritesheet for each layer. The latter solution isn't as efficient as using only one spritesheet, but depending on the number of sprites you have, may be more efficient than adding your sprites directly to your layers.

Posted 1 year ago #
FiberCore
Member

Thank you, @chrisco
If I add the sprites sheet in the parent layer and add some sprites from the sheet in another layer, will it waste additional memory?

Posted 1 year ago #
codeman9
Member

Can you add the batchNode to the scene and then access the batchNode from each layer that is a child of the scene?

Posted 1 year ago #
araker
Moderator

@chrisco, the batchnode can be the parent of multiple layers. The batchnode will be used to render all its descendants that are associated with it, so that includes children, grandchildren and so on.

@FiberCore, the batchnode should be the parent of all the layers that have sprites associated with it.

So add the layer to the batchnode, add the sprite to the layer and load the sprite with
+(id) spriteWithSpriteSheet:(CCSpriteSheet*)spritesheet rect:(CGRect)rect;

Posted 1 year ago #
chrisco
Member

@araker - Has this changed with .99.5 and the switch to CCBatchNode? In the source code for CCSpriteSheet, there are some limitations listed, including this one:

* - The only object that is accepted as child (or grandchild, grand-grandchild, etc...) is CCSprite or any subclass of CCSprite. eg: particles, labels and layer can't be added to a CCSpriteSheet.

It seems to me I tried adding a CCNode that had a CCSprite as a child to a spritesheet and didn't see an improvement in performance until I added the CCSprite directly. That was a while ago, though, and I honestly haven't tried it since...

Posted 1 year ago #
araker
Moderator

Well I thought I knew how a batchnode worked, guess I should have checked the source again before making that last comment. Now I think about it, the visit method of the layer would interfere with the batchnode drawing. Sorry for the confusion, you're right indeed.

@FiberCore, multiple batchnodes using the same texture won't have a extra memory penalty. The texture is loaded once into memory, the texture cache makes this happen.

Posted 1 year ago #
FiberCore
Member

Hi @chrisco, @araker, I am confused now.

If I can use batchnode across different layers, how to use it? In my situation, I created a batchnode and a layer in the scene. I just want to use batchnode in the layer. How to accomplish it?

BTW, as @araker said, if I created the batchnode in the layer (it means I created it twice, one in the scene, and the other in the layer), it won't have a extra memory penalty?

Posted 1 year ago #
lsozke
Member

My 2 cents, multiple spritesheets with the same texture in several layers would NOT have extra memory penalty while the TextureCache is the same. However, CPU/framerate penalty may appear while each spritesheet injects more OpenGL calls for each draw. In general spritesheets with duplicated texture would the easiest approach for layers and you can test the framerate drawback quickly.

Posted 1 year ago #
araker
Moderator

It's exactly like you describe in the last part of your post. Create a second batchnode in the layer and add the sprites to it. The texture of both batchnodes is loaded only once, although every batchnode has its own draw call and texture bind call. Which is still far better than drawing each sprite individually.

Posted 1 year ago #
FiberCore
Member

Hi @lsozke, @araker
I have tried your suggestions. It works. But the result is very sad. The frame rate of [batchnode2 addChild: spriteFromSheet] in the layer which included a duplicated batchnode is slower than using [self addChild: spriteFromSheet] in the layer directly.

Posted 1 year ago #
araker
Moderator

Try to add the sprites the same way as in this topic. With your current method I don't think they're batched at all.

Posted 1 year ago #

FiberCore
Member

Hi @araker, thanks for your response. I found '[ball useSpriteSheetRender: sheet];' in the topic you mentioned. I never use it before. But the result is same when I add it in my codes.

CCSpriteFrameCache *cache = [CCSpriteFrameCache sharedSpriteFrameCache];
[cache addSpriteFramesWithFile:@"MenuStageStuff.plist"];
id menuBatchNode = [CCSpriteBatchNode batchNodeWithFile:@"MenuStageStuff.png" capacity:90];		

for (int i = 0; i < 14; i++)
{
	NSString *frameNameTwitterDialog = [NSString stringWithString:@"SomeChild.png"];
	CCSprite *someSprite = [CCSprite spriteWithSpriteFrameName:frameNameTwitterDialog];
	someSprite.position = CGPointMake(1024/2, 768/2+150);
	[someSprite useBatchNode: menuBatchNode];
	[menuBatchNode addChild:someSprite z:0 tag:i];
}
[self addChild:menuBatchNode];

The frame rate is slower than :

for (int i = 0; i < 14; i++)
{
	NSString *frameNameTwitterDialog = [NSString stringWithString:@"SomeChild.png"];
	CCSprite *someSprite = [CCSprite spriteWithSpriteFrameName:frameNameTwitterDialog];
	someSprite.position = CGPointMake(1024/2, 768/2+150);
	[self addChild:someSprite z:0 tag:i];
}

all the codes is in my child layer which was created in the scene.

Posted 1 year ago #

araker
Moderator

This doesn't make any sense, when did you go down the rabbit hole?

Why are your placing all the sprites on the same position? If you're trying to make a complex static background with different parts, a render texture would be more efficient.

Posted 1 year ago #

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