cocos2d for iPhone

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

1. 

   Achmes
   Member

   Mm...
   So Here's how I'm doing it:

   *Objects are sorted from furthest to nearest (not sprites-but objects. I mean, I have an array with 5k elements witch keeps objects position)

   *One by one, I add this objects.
   1) if object IS NOT on the bound:
   `[sprite_sheet addChild: texture]
   teksturka.vertexZ = z_pos;`

   2) if object is onthe bound (so it's in two rooms at one time)
   `[self addChild: texture]
   teksturka.vertexZ = z_pos;`

   *At the end I add SpriteSheets
   [self addChild: sprite_sheet];

   Is it OK?

   Well, I see that objects are rendered now in correct order (at least - it seems so), but there're some bugs with sprites that are NOT added to spritesheet but directly to scene.
   

   These palms and monument are added to scene directly ([self addChild:texture] )
   Can you see theses black pixels on the boundary?

   On this screen you can see exactly witch pixels are turned into black.
   

   Edit:
   This problem appears only if the object is only above background.
   So it looks like these sprites were rendered before background.
   But I'm completely sure that first I add background and them other sprites :/

   Edit2:
   Solved, I had to add spritesheet to scene earlier.
   [self addChild: sprite_sheet];

   I'll take a look at game now and search for other problems :P

   Posted 1 year ago #
2. 

   Achmes
   Member

   -----------
   Argh... I think it can't be done.

   It's not possible to render alpha sprites within two or more SpriteSheets.
   There would be always a sprite which is rendered first although it should be rendered second.

   The only possibly solution for it is to create only one SpriteSheet with all sprites on the map.
   But then, we back to our perfomance problem.
   Isn't it really possible to make it work simply fast with out dividing map into rooms?

   Posted 1 year ago #
3. 

   TBBle
   Moderator

   You could maybe turn on alpha testing? It's pretty expensive on the GPU though, as I recall.

   Posted 1 year ago #
4. 

   Achmes
   Member

   I want to ask about CCSprites again.
   The same situation - 3k sprites and I add all of them to one CCSpriteSheet.

   No I want to make it invisible.
   I tried to do it in two ways.
   1)
   

   CCSprite *sprite[2000];
   ....
   [spritesheet addChild: sprite[j]]   ///add all sprites to ccspritesheet
   ....
   for(int i=0; i<3000; i++)
   {
       sprite[i].visible = NO;
   }

   By doing this I have 25 FPS.

   2)
   

   CCSprite *sprite[2000];
   ....
   [spritesheet addChild: sprite[j]]   ///add all sprites to ccspritesheet
   ....
   spritesheet.visible = NO;

   Now - 50 FPS.

   So the second way is obviously better, but I don't want to make all map invisible of course but only some sprites witch aren't on the screen.
   Do I have to do it by writing "sprite.visible =...", or I should change this visibility differently (somehow, in spritesheet) ?

   Posted 1 year ago #
5. 

   araker
   Moderator

   @Achmes, I'm getting the impression that you're running in circles here. On the first page I already explained why 2) is faster than 1).

   Like I did in a PM, I advise you to create a spritesheet for each depth layer of a 'room'. That way you don't have to draw the sprites from all the rooms and performance is still good, since you're batching as much as possible. You'll need to figure out which sprites belong on which depth level, which can be some work.

   You've mentioned that you wanted one big spritesheet where you could control when which ranges of sprites would be drawn. The approach above is essentially that, but it doesn't require rewriting CCSpriteBatchNode and CCTextureAtlas. Also for both approaches you'll need to sort out your sprites to get them into the correct draw order and performance will be almost similar. I wouldn't bother with a solution that'll cost a lot more work and doesn't have any real advantages.

   Posted 1 year ago #
6. 

   Achmes
   Member

   Yep..But I didn't want to divide room into depth layer, becouse it causes the situation where I have to decide whather the particular object is in layer A or B, and I can mix it. It can't be at A and B at one time.
   For example, I have tree and stone. Somewhere in the map I want tree to be before stone, and somewhere else, I want it to be behind..

   Now, it can't be mixed, so this is a kind of limitation. That's why I was looking for another ways to do it.

   But if you say that, I will do it and see how it works :>

   Posted 1 year ago #
7. 

   araker
   Moderator

   That's not true, you can make multiple instances of your tree and stone and decide for each instance what the vertexZ/ zOrder value is.

   Posted 1 year ago #
8. 

   Achmes
   Member

   I've tried to divide map into depth layers.
   Each room, also has now 13 deepth layers.

   I think it solved problem with alpha sprites,but problem with performance came back....
   When I render whole map - 40-50 FPS, but when I add animations to some sprites and also render one big sprite(background - 1024x512), fps goes to 30 FPS.
   Adding colision etc. and here it is - 20 fps ;/ gush....

   Edit:
   And there is something strange, I haven't mentioned before.
   When I run my app I have 20 fps, and after 30-60 seconds it goes to about 30 fps. It happens really often and I can't find what causes it.

   Edit2:
   I'm not sure, but this lag may appear only when I install app on the device and run it for the first time. I'm checking it....

   It would be great to boast my app about....about 10 fps more will be great :P
   Maybe I should divide map into smaller rooms -250 px width instead of 490 px... But more rooms - more CCSpriteSheets. It's going to look like CCSprites....

   Posted 1 year ago #
9. 

   araker
   Moderator

   @Achmes, so when are you going to put me on your payroll? ;)

   Try to divide your big background in pieces of 512 x 512 (or 256 x 256, try out which one gives the best result) that way the GPU doesn't have to draw/discards the parts of it that aren't visible. Also for all your spritesheets that don't have any transparency try to disable blending (especially for the background)..

   [sheet setBlendFunc:(ccBlendFunc){GL_ONE,GL_ZERO}];

   Posted 1 year ago #
10. 

    Achmes
    Member

    @Achmes, so when are you going to put me on your payroll? ;)

    :P :P :P

    Ok, so I've resized background, and disabled blending.It helped a little but the maximum fps I get is 35.
    (40 when I disable animations, but I guess it can't be improved)

    Argh...Not so bad, but could be better :)

    Posted 1 year ago #

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