Comments on: Getting smooth verticle scrolling with flash

By: Agosti

Agosti — Fri, 12 Mar 2010 02:34:12 +0000

Tearihg on Intel Dual Core, sinfle AMD, ATI video, Nvid3a video, so…;

By: Scmorr

Scmorr — Thu, 04 Feb 2010 12:28:56 +0000

We dont know is this bug similar or not, cos I have even greater tearing and jumps on single core computer (just tested). And – let Adobe check this issue and let Adobe will decide – is it double-buffering problem or smthing other. Your issue example is more fundamental, so it would be great to have this bug in database. I try to popularize it and bring as many votes as I can.

By: tonyp

tonyp — Thu, 04 Feb 2010 12:01:24 +0000

I’m sure Adobe would be quite aware of it, there are a few existing tearing bug posts on there – mostly focused on tearing video. One on multicores- saying that it doesnt happen as much with a singlecore (fix = use older player which only supports a single core – interesting)
http://bugs.adobe.com/jira/browse/FP-2054
i have voted – but by the assignee’s status of priority=none – i dont think Adobe will give it much attention. They seem to be adding better hardware support etc. lately, so lets hope they work on double buffering in the future.

By: Scmorr

Scmorr — Thu, 04 Feb 2010 11:28:43 +0000

If you submit this issue into Adobe JIRA – give us a link here – we will vote for it.

By: tonyp

tonyp — Thu, 04 Feb 2010 10:54:51 +0000

We have Q6600 quad core, ATI4800 –
so you are saying that things still tear – that is what i am saying too. It should be a bit better in wmode=direct – but still jumps (not tears) every now and then.

By: Scmorr

Scmorr — Thu, 04 Feb 2010 10:51:06 +0000

Tearing on Intel Dual Core, single AMD, ATI video, Nvidea video, so…

By: Scmorr

Scmorr — Thu, 04 Feb 2010 10:47:51 +0000

I’m sorry, I’ve experiment with you code and… your case isnt my case. I suppose this is internal rendering issue of flash player, because I’ve test your code with copyPixels to background bitmapData and even bitmapData.scroll method, which should give us a guaranty of synchronous circles moving. But I’ve seen tearing anyway.

Are you testing this on dual CPU computer? Mine is dual, I will try it on single CPU comp.

By: tonyp

tonyp — Thu, 04 Feb 2010 02:17:59 +0000

So yes – you can see tearing in scarygirl – for instance, if you go to the swimming level (second one) and swim up/down you can see noticable tearing. It isnt as much of a problem there however, as the motion is quite slow.

By: tarwin

tarwin — Thu, 04 Feb 2010 00:36:46 +0000

In Scarygirl I think the problem was mitigated by the fact there was never much fast vertical movement. We just had a bunch of Bitmaps sitting in a MovieClip we moved around, so it’s pretty similar to a bitmapCached vector that’s not moving in these tests.

The really wacky thing was, as Tony said, that there was strange rendering bugs. We had about 53 600×625 tiles, one above another, that was moving pretty fast (it’s a racing game). For some reason the ones on the bottom of the rendering stack where just showing as a flat colour, at least for part of the sizes. The rest were then fine.

The really wacky thing was that if we had the blocks that screwed up at the end of the track we’d get an almost “hall of mirrors” effect when the track ended.

We found if we removed two of them it’d be fine though. Insane!

By: Scmorr

Scmorr — Wed, 03 Feb 2010 19:24:37 +0000

Sorry for misprints:

- [SWF(... frameRate = "100")]
- while (dtInt < 37) {