cocos2d for iPhone

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

1. 

   BlueGooGames
   Member

   I'm making a game where I have a big background, which is one big image, and can not practically be converted into a tile map.

   My dream would be to have this image in high resolution for the retina display, 4096 x 2048. I think this will consume 33 Mb which probably is too big, and since I also want some other layers for foreground and background, that will be too much.

   I will need to split this into smaller blocks, but since it's a fast game I could not load the maps on the fly, so it needs to be in the memory all the time, so it will consume the same amount of memory as a big image.

   But as cocos2d is limited to 2048 x 2048 i would need to split it into smaller blocks. But since this seems so memory consuming, I would want to use lower res backgrounds, like 2048 x 1024 (8 Mb memory usage).

   So my question is: Can I use lowres images (same for both retina and non-retina) for backgrounds, and highres images for sprites like player, bullets etc?

   This way the game would look good on iPhone 4, as long as you don't pay too much attention to the backgrounds, which will be scrolling anyways, so maybe lowres will do.

   I was thinking that I would have some kind of scaling problem if mixing background.png with player.png/player-hd.png. Maybe it's just a simple if/then?

   Thanks for any comments on this! :)

   Posted 1 year ago #
2. 

   akasurreal
   Member

   If Cocos cannot find the -hd asset, it will automatically use the lower resolution. So for Retina devices loading the lo-res image, you will then need to scale it to 2x after loading. That is the only way I know of to mix and match HD and non-HD assets for Retina.

   Posted 1 year ago #
3. 

   BlueGooGames
   Member

   Thanks, yes that's what I figured. I will try that once I get to pimping my graphics. It's a long way left though :)

   Posted 1 year ago #
4. 

   sndwav
   Member

   this should probably work...
   

   [mySprite setScale:mySprite.scale * CC_CONTENT_SCALE_FACTOR()];

   When Cocos2D runs on non-retina display, the content scale factor equals 1, and when on retina display it equals 2.

   Posted 1 year ago #
5. 

   Jonathan
   Member

   Otherwise it could be an idea to modify the Sprite creation methods.

   It could go something like this:

   in CCSprite.h
   BOOL	spriteRetinaScaled;
   
   in CCSprite.m
   #import "Support/CCFileUtils.h"
   
   -(id) initWithFile:(NSString*)filename
   {
   	NSAssert(filename!=nil, @"Invalid filename for sprite");
   
   	CCTexture2D *texture = [[CCTextureCache sharedTextureCache] addImage: filename];
   	if( texture ) {
   		CGRect rect = CGRectZero;
   		rect.size = texture.contentSize;
   
   		CCSprite* newSprite = [self initWithTexture:texture rect:rect];
   
   #if CC_IS_RETINA_DISPLAY_SUPPORTED
   		// -hd asset not exist scale times device ratio
   		NSString* usedFilePath = [CCFileUtils fullPathFromRelativePath: filename ];
   		if( [usedFilePath rangeOfString:CC_RETINA_DISPLAY_FILENAME_SUFFIX].location == NSNotFound ) {
   			[newSprite setScale:CC_CONTENT_SCALE_FACTOR()];
   			spriteRetinaScaled=TRUE;
   		}
   #endif
   
   		return newSprite;
   	}
   
   	[self release];
   	return nil;
   }
   
   -(id) initWithFile:(NSString*)filename rect:(CGRect)rect
   {
   	NSAssert(filename!=nil, @"Invalid filename for sprite");
   
   	CCTexture2D *texture = [[CCTextureCache sharedTextureCache] addImage: filename];
   	if( texture ) {
   
   		CCSprite* newSprite = [self initWithTexture:texture rect:rect];
   
   #if CC_IS_RETINA_DISPLAY_SUPPORTED
   		// -hd asset not exist scale times device ratio
   		NSString* usedFilePath = [CCFileUtils fullPathFromRelativePath: filename ];
   		if( [usedFilePath rangeOfString:CC_RETINA_DISPLAY_FILENAME_SUFFIX].location == NSNotFound ) {
   			[newSprite setScale:CC_CONTENT_SCALE_FACTOR()];
   			spriteRetinaScaled=TRUE;
   		}
   #endif
   
   		return newSprite;
   
   	}
   
   	[self release];
   	return nil;
   }

   Then override set scale to take into account the scale already done (using spriteRetinaScaled).

   Posted 10 months ago #

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