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[cocos2d-iphone] Hello & Rendering texture using UIGraphicsBeginImageContext() - works on simulator, fail on device Fraggle Thu Apr 30 18:00:31 2009


First, thanks a lot for the great framework. I am currently switching
all my custom UIKit/CoreAnimation/OpenGL code to cocos2d and I'm
_very_ happy. I'll be sure to donate once I'm done with my game.

Obviously, I've got a question for experienced cocos2d programmers.
I really did try to figure it out myself but, at this point, I have
absolutly no idea what's happening...

Here is the pseudo-code (I try to sum up all the relevant part.. i

My director's options are:
[[Director sharedDirector] setPixelFormat:kRGBA8];
[[Director sharedDirector] setDepthBufferFormat:kDepthBuffer16];

I am subclassing Sprite to create a CharacterCardSprite. My goal is to
render the CharacterCardSprite texture on init using Quartz.
Here is my code:

@implementation CharacterCardSprite

- (CharacterCardSprite *) initWithCharacter: (Character *)aCharacter
        self = [super initWithCGImage: [CharacterCardSprite
textureForCharacter: aCharacter]];

        if ( self )
                self.character = aCharacter;

        return self;

+ (CGImageRef) textureForCharacter: (Character *) aCharacter
        UIImage *bg = [UIImage imageNamed:@"bg.png"];
        UIImage *lvlImage = [UIImage imageNamed: @"lvl1.png"];


        // BG
        CGContextSaveGState( UIGraphicsGetCurrentContext() );
        CGContextTranslateCTM( UIGraphicsGetCurrentContext(), 0,
        CGContextScaleCTM( UIGraphicsGetCurrentContext() , 1.0, -1.0);

        CGContextDrawImage ( UIGraphicsGetCurrentContext(),
                                                CGRectMake(0, 0, bg.size.width, 

        CGContextRestoreGState( UIGraphicsGetCurrentContext() );

        // Level
        CGContextSaveGState( UIGraphicsGetCurrentContext() );
        CGContextTranslateCTM( UIGraphicsGetCurrentContext(), 25, 114 +
        CGContextScaleCTM( UIGraphicsGetCurrentContext() , 1.0, -1.0);

        CGContextDrawImage ( UIGraphicsGetCurrentContext(),
                                                CGRectMake(0, 0, 
lvlImage.size.width, lvlImage.size.height),

        CGContextRestoreGState( UIGraphicsGetCurrentContext() );

        UIImage *cardTexture = UIGraphicsGetImageFromCurrentImageContext();

        return cardTexture.CGImage;



It works perfectly fine in the simulator, but It doesn't show up at
all on the device, no runtime error either. Hard to debug :)
I guess it's somewhat related to some kind of format issue... but as I
said previously, I'm really clueless now...

If someone could point me to the right direction, I'ld really
appreciate it...

Thanks for your time,


Did you read the cocos2d documentation? http://tinyurl.com/b8cqm3
Please, read it before asking for help. Probably your answer is there.