Sparrow Forum

1. 

   alex_h
   Moderator

   Hi there,

   I am using a SPTextureAtlas to create multiple frames of a timeline class that extends Sprite (ie, like a movieclip). This works fine when I run it in the iPhone simulator, but when I try to compile it onto an ipod touch I get a EXC_BAD_ACCESS exception. Using the debugger I have found that this is being thrown by the SPTextureAtlas method parseAtlasXml when it callls [xmlParser parse]; but as far as I can see the xml path I have passed in is valid (otherwise why does it work in the simulator?).
   I only started moving to Objective C from Actionscript a week ago so I'm a bit stuck now, I wondered if anyone had any thoughts as to what might be going wrong? Am I missing some way of embedding my xml assets or something? I'm using Xcode version 3.1.4, and publishing to an ipod touch running 3.1.2 I think.

   thanks,

   Alex H

   Posted 2 years ago #
2. 

   alex_h
   Moderator

   ok, it was my fault - the dimensions of the png I was trying to use exceeded the maximum the device could handle!

   Just ignore me...

   Posted 2 years ago #
3. 

   Daniel
   Primary Feather

   Hi Alex!
   It's great that you could solve your problem =)

   I can give you a little more info on textures:

   • The iPhone can handle textures up to 1024x1024 pixels (as you know by now ;-)).
   • For optimal performance, you should use only textures that have widths and heights that are powers of two (1024, 512, 256, 128, 64, 32, ...). OpenGL can only handle those kinds of textures, so Sparrow will have to convert the texture if it does not have a size like that. (That's another reason why a texture atlas is so useful, as the "power-of-two"-constraint only affects the complete atlas, not the textures within it.)

   Posted 2 years ago #
4. 

   Daniel
   Primary Feather

   Hi Alex!
   Good that you could solve your problem =)

   I can give you a little more info on textures:

   • The iPhone can handle textures up to 1024x1024 pixels.
   • For optimal performance, you should use only textures that have widths and heights that are powers of two (1024, 512, 256, 128, 64, 32, ...). OpenGL can only handle those kinds of textures, so Sparrow will have to convert the texture if it does not have a size like that.

   Posted 2 years ago #
5. 

   alex_h
   Moderator

   Hi Daniel,

   thanks for the tip! I'll make sure I resize my textures for optimal performance.

   cheers,

   Alex H

   Posted 2 years ago #

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