A fast, easy to use, free, and community supported 2D game engine
mattiasmak
Member
I've noticed that when removing code for my static background image the framerate goes from ~30fps to over 40fps. I now use a sprite to define the background. Is it any other way that is less expensive. I'm not moving it at all.
To code right now:
background = [Sprite spriteWithFile:@"t1_5.jpg"];
[self addChild:background z:0];
background.position = ccp(240, 160);
mattiasmak
Member
Here's a video of work in progress.
| Get the Video Widget |
Osiris
Member
Very strange. I just added similar block to a test that was running at 60FPS a second ago...
This is related to a problem on another thread that I was having a couple of days ago.
when added to the init section of a a GameLayer (right after other Sprites being added and labeled).. I added this:
//Add Background
Sprite *bg = [Sprite spriteWithFile:@"image15.jpg"];
[self addChild:bg z:0];
bg.position = ccp(240, 160);The Sprites are set to z:1 so they show up against the background. The image15.jpg is sized 320x480 so it fits the screen perfectly and is only about 30K.
but the instant I run it on the simulator, Idrop from 60FPS to 30FPS.
What am I fundamentally missing? Whatever is wrong here would probably also be wrong in the slideshow I was whining about on the other thread.
mattiasmak
Member
Osiris: Could the pixel format be a part of your problem?
Try this:
[Texture2D setDefaultAlphaPixelFormat:kTexture2DPixelFormat_RGBA8888];
Sprite *sprite = [Sprite spriteWithFile:@"image15.jpg"];
Or read more here: http://www.cocos2d-iphone.org/archives/61
The Sprites are set to z:1 so they show up against the background. The image15.jpg is sized 320x480 so it fits the screen perfectly and is only about 30K.
It's only 30 Kb on the disk but not in memory ! It takes up a lot more. Also, is there any particular reason why your image is a jpg and not a png ?
but the instant I run it on the simulator, Idrop from 60FPS to 30FPS.
Do you notice the same FPS drop on the device as well ? The performance on the simulator can be very different (it can be better or worse).
Osiris
Member
@Clain - i'm not far enough along to attempt compiling for the device. I'm still trying to raise the money for the developer key.
I can try PNG. The Image just came to me as a JPG.
So, each image will be ~ 460K in memory?
@Mattiasmak - I'll try that and also converting the image to PNG.
It just seems odd that its exactly 1/2 (60 to 30)
@Osiris :
Your 320x480 image will be 512x512x4 bytes in memory, ie 1024 KB or 1 MB (if each pixel is defined by 4 bytes, which is the case with kTexture2DPixelFormat_RGBA8888).
As for the performance thing, it's all guessing I think. I have a game a that runs faster on the simulator, and another one that runs way slower. You can expect the simulator to load files from disk much faster than the device. You can also load a lot of stuff in video memory without texture swapping because the simulator uses your mac's graphics card which is far superior to the iPhone's GPU. Besides that, I don't really know.
Osiris
Member
in what im attempting, I need a few multi-sized sprites rotating, zooming, twisting and moving around while one tries to click on the background.
Am I correct to assume that you need the background to be a sprite in order to register a touch (one thats not touching any other sprite) or is there a simpler way?
spawrks
Member
I too would like to know what the 'recommend' way for using a large background image is... does anyone have experience with this? I'm trying to figure out without having an Ipad how to have sprites move across a background correctly. Without having ANY game code , a simple bg sprite load makes the FPS go to ~25. that with NO other things running. For such a large new screen size, what is the proper way to put a background image behind game sprites so there isnt the FPS drop?
I believe it has something to do with the same issue described in this thread: http://www.cocos2d-iphone.org/forum/topic/3507
I've notice this problem as well and haven't been able to fix it. Even if you remove everything, and just have blank Cocos2d projcet and load up two 480x320 images, you'll see the 60 to 30 FPS drop instantly. I'm not sure how to fix it, seems like it might be a bug. I've tested on 0.8.2 but not on .9+. Are any of you seeing this problem on .9 and above?
- kalx
I am experiencing a similar frame rate drop when adding a static background image to my one layer app. The frame rate without the background image are near 60fps. When I ad the background (with nothing else) the FPS drop to 20 running on the iPad simulator.
I am using the fast link director and texture pixle format of kTexture2DPixelFormat_RGBA4444. The background image is 1024x768.
Some more info: I had been playing with different types of layers earlier, and I found when I changed my single layer back to a CCLayer (from a CCColorLayer), my FPS went up to 30 with my background displayed.
I've got the exact same problem. Running at 60.0 fps in the iPad Simulator (Beta 5) with no background. Add a 1024x768 PNG background as a sprite and the fps drops to 20.0. Tried using pvrtc texture at 1024x1024, still 20.0. Tried a 512x512 pvrtc texture scaled on the X and Y by 2 to fill the screen, and still 20.0. The same 512x512 texture in the iPhone simulator gets me 60.0.
It's a universal app. Using cocos2d v0.99.1 released today.
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