Smooth transition from Default.png

cocos2d for iPhone » Programming » cocos2d support (graphics engine)

Smooth transition from Default.png

(22 posts) (12 voices)

Started 2 years ago by Joao Caxaria
Latest reply from mickeyl

Tags:

Joao Caxaria
Member

Hi guys,

i know this was asked before but I can't seem to find it...

Does anyone knows how to have a smooth transition from the default.png image to the first scene? I always get a flicker...

Thanks!

Posted 2 years ago #

//Fix flash of black before first scene can load
Sprite *sprite = [[Sprite spriteWithFile:@"Default.png"] retain];
sprite.anchorPoint = CGPointZero;
[sprite draw];
[[[Director sharedDirector] openGLView] swapBuffers];
[sprite release];

Posted 2 years ago #

Joao Caxaria
Member

Thanks CJ :)

Posted 2 years ago #

tr00ney
Member

I just browsed the forum for a solution for this, but I do not seem to get this to work for me. How and when exactly do you do that ?

This what I have at the moment :

// create an initilize the main UIWindow
	window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

	// Attach cocos2d to the window
	[[Director sharedDirector] attachInWindow:window];
	[Director sharedDirector].displayFPS = YES;

	// before creating any layer, set the landscape mode
	[[Director sharedDirector] setDeviceOrientation:CCDeviceOrientationLandscapeLeft];

	// Make the window visible
	[window makeKeyAndVisible];

        GameScene * gs = [GameScene node];
	[[Director sharedDirector] runWithScene:[ZoomFlipXTransition transitionWithDuration:1.0 scene:gs]];

and the Default.png is just there for hald a second or so, which does not look very pretty.

Posted 2 years ago #

jeffreyv
Member

To get rid of the flicker you put the code CJ posted after your [window makeKeyAndVisible]; line.

// Make the window visible
[window makeKeyAndVisible];

//Fix flash of black before first scene can load
Sprite *sprite = [[Sprite spriteWithFile:@"Default.png"] retain];
sprite.anchorPoint = CGPointZero;
[sprite draw];
[[[Director sharedDirector] openGLView] swapBuffers];
[sprite release];

GameScene * gs = [GameScene node];
[[Director sharedDirector] runWithScene:[ZoomFlipXTransition transitionWithDuration:1.0 scene:gs]];

Posted 2 years ago #

tr00ney
Member

Hmm thats what I have. Still no change

Posted 2 years ago #
Steve Oldmeadow
Administrator

Try not using a transition when you call runWithScene.

Posted 2 years ago #
MikeHart
Member

What decices are you guys (with flickering) using. On my Ipod Touch 2nd gen (SDK 2.2.1) I do runWithScene with a fadein transition and I see no flickering.

Posted 2 years ago #
GameBit
Member

You can always try "hacky" way.
go to Director.m (cocos2d)

find:
animationTimer = [NSTimer scheduledTimerWithTimeInterval:animationInterval target:self selector:@selector(mainLoop) userInfo:nil repeats:YES];

before it add:
[self mainLoop];

Posted 2 years ago #
edaniels
Member
Okay, I'm confused... CJ's fix used to work quite well in my program, but not anymore. Something must have changed, but I have no idea what. Do any of you have any idea what's going wrong here?

This is in my AppDelegate's applicationDidFinishLaunching method, just after the window is made key and visible, but just before I create the first CCScene:
```
//Fix flash of black before first scene can load (from http://www.cocos2d-iphone.org/forum/topic/2055)
	CCSprite *sprite = [[CCSprite spriteWithFile:@"Default.png"] retain];
	sprite.anchorPoint = CGPointZero;
	[sprite draw];
	[[[CCDirector sharedDirector] openGLView] swapBuffers];
	[sprite release];
```
Posted 1 year ago #

crmagicxxx
Member

For latest versions of cocos:

CCSprite *sprite = [CCSprite spriteWithFile:@"Default.png"];
sprite.anchorPoint = CGPointZero;
CC_ENABLE_DEFAULT_GL_STATES();
[sprite draw];
CC_DISABLE_DEFAULT_GL_STATES();
[[[CCDirector sharedDirector] openGLView] swapBuffers];

Posted 1 year ago #

edaniels
Member

Thanks!!

So CCSprites don't need retain/release anymore, and a sprite won't "draw" unless the GLstate is set back to the defaults.

Looks like I need to pay more attention to those release notes...

Thanks again!

Posted 1 year ago #
Codemattic
Moderator

"So CCSprites don't need retain/release anymore" - they never did. They didnt do any harm in your original code, but werent necessary.

Posted 1 year ago #

CJ
Moderator

Update:
Since Apple is allowing the undocumented API call to UIGetScreenImage()

I've updated my code for re-displaying the default screen so that when supported it will not need to read from the file system, and instead just redisplay the contents of the screen directly.

This is needed to call the private API method:

extern "C" CGImageRef UIGetScreenImage(void);

inline CGImageRef CreateCGImageWithContentsOfScreen(void) {
	return UIGetScreenImage(); /* already retained, so be sure to do a CGImageRelease() on the returned image later. */
}

After attaching the director but before running the first scene do:

CCDirector *director	= [CCDirector sharedDirector];

NSString *defaultFile	= @"Default.png";
CCSprite *defSprite;
CGImageRef defaultImage	= CreateCGImageWithContentsOfScreen();
if(defaultImage){
	CCLOG(@"Redisplay DefaultImage: Got Default.png image for 'free' by grabbing UI framebuffer contents.");
	defSprite		= [CCSprite spriteWithCGImage:defaultImage key:defaultFile];
}else{
	CCLOG(@"Redisplay DefaultImage: Getting Default.png image from filesystem.");
		defSprite		= [CCSprite spriteWithFile:defaultFile];
}
CGImageRelease(defaultImage);

defSprite.anchorPoint = CGPointZero;

CC_ENABLE_DEFAULT_GL_STATES();
[defSprite draw];
CC_DISABLE_DEFAULT_GL_STATES();
[[director openGLView] swapBuffers];

[[CCTextureCache sharedTextureCache] removeTexture:[defSprite texture]];

Posted 1 year ago #

riq
Key Master

@CJ: nice.

would you like to update the "director flicker tip" with your tip ?
http://www.cocos2d-iphone.org/wiki/doku.php/tips:director_flicker

Thanks.

Posted 1 year ago #
CJ
Moderator

@riq: I updated the wiki:
http://www.cocos2d-iphone.org/wiki/doku.php/tips:director_flicker

Please verify accuracy of the < .99 version code because I just went off memory for the API diffs and haven't actually tested that code.

Posted 1 year ago #
riq
Key Master

@CJ: thanks. yes, the <.99 seems to be OK.

Posted 1 year ago #
mickeyl
Member

I need to resurrect this thread as it doesn't work for me. I'm using SDK 3.2 w/ a project for the iPad which supports both LandscapeLeft and LandscapeRight. For one frame, the default.png is shown, however always rotate (like in portrait mode), it looks as if at the time of displaying the sprite the director has not yet processed the correct orientation.

Posted 1 year ago #
CJ
Moderator

@mickeyl Ahh, I can see how that would be the case.

I'll setup a test and let you know what I come up with.

Posted 1 year ago #
CJ
Moderator
@mickeyl Sorry being a bit lazy about this because my project isn't buildable at the moment. But I think this may solve the issue. Can you test it out and let me know?
```
[[CCDirector sharedDirector] applyLandscape];
```
Posted 1 year ago #
mickeyl
Member

@CJ: Thanks for getting back, unfortunately this doesn't fix it. If applied after the call to SetDeviceOrientation, the whole game then is wrongly orientated (portrait w/ a black stripe), if applied before the call to SetDeviceOrientation, the same effect as before.

Posted 1 year ago #
mickeyl
Member

@CJ: The solution in http://www.cocos2d-iphone.org/forum/topic/5351 seems to work fine for me, is that a "clean" solution or can we improve on that?

Posted 1 year ago #

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