Starling Forum

1. 

   Michoko
   

   Competent Bird
   Joined: Jan '12
   Posts: 40

   Hi!

   I stumbled upon this video from Fabio, showing some very nice UI features.
   http://m.youtube.com/#/watch?desktop_uri=%2Fwatch%3Fv%3Dw1faJ2V_BRU%26hd%3D1&hd=1&v=w1faJ2V_BRU&gl

   I'm about to implement a kind of images gallery, which contains around 50 640x960 pixels pictures. Of course this is far too much to fit inside the GPU memory, so I was wondering of the best way to implement this. In the video it seems there are many graphical elements, and it is still very smooth. Of course this is an ipad 3, and on my iPhone 3GS, uploading a texture to the GPU is much slower. But is there some built in method to upload a low res version of a texture, that will be replaced by a higher version only if it's zoomed in? I suppose this is the purpose of mipmaps, but is the whole texture always uploaded to the GPU, or is only the lowres version uploaded, until the higher version is required?

   Any tip would be welcome

   Thank you!

   Posted 1 year ago #
2. 

   Daniel
   

   Primary Feather
   Joined: Jan '10
   Posts: 2,444

   The next Flash version will contain such a feature, allowing to progressively load textures. That should make this easier!

   Until then, you need to find a smart moment to load the new, and dispose the old texture.

   Posted 1 year ago #
3. 

   fabiobiondi
   

   Senior Bird
   Joined: Mar '12
   Posts: 66

   "allowing to progressively load textures"
   I didn't know it. That's sounds great.

   @Michoko: are you talking about my videos?(the link you posted is broken)

   I have simply done this:
   1) as Daniel Said I always dispose everything, so when I don't need an image anymore I dispose it and all related stuff

   2) I use a little trick. I simply have two version of my bitmaps (low-res < 100px) and "hi-res" (>=1024).
   I always load low-res images, so even if user changes images very quickly they are loaded fast. Only when user stops to interact with the galleries I load the hi-res images. In this away I avoid to load hi-res images when not needed.

   The problem is that when you try to load hi-res images the application freezes for a while, so I have to find the best moment to load these images.

   When the "progressively load textures" feature will be supported or when we'll use Workers or multithreading we'll find a better way to handle it.

   Naturally if somebody has a suggestion to improve it I'm here

   Posted 1 year ago #
4. 

   Daniel
   

   Primary Feather
   Joined: Jan '10
   Posts: 2,444

   It's a great idea to default to low-res textures and only switch to HD when it's necessary! Most users won't notice, and it's much less disturbing than a choppy interface.

   Posted 1 year ago #
5. 

   flxeken
   

   Hatchling
   Joined: Dec '12
   Posts: 1

   Daniel, what is that "progressive load" feature you mentioned and when it is coming? Is it Workers you are referring to?

   Otherwise, wouldn't it be possible to chop images up in little pieces and upload them one by one to the GPU and the assemble them there (or just put them side by side if assembly is impossible).
   In that way we could create a GPU stream that removes that nasty freeze.

   Posted 5 months ago #

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