# The PVR tile engine freaking out?

**URL:** <https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380>\
**Category:** PowerVR Insider\
**Created:** [April 12, 2012, 6:26am UTC](https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380 "2012-04-12T06:26:48Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jackasser](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jackasser](https://forums.imgtec.com/u/jackasser)\
**Post date:** [April 12, 2012, 6:26am UTC](https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380/1 "2012-04-12T06:26:48Z")

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Hi!  
  
  
  
  
  
I’m currently doing quite advanced shader stuff on my iPad2 and so far everything has been working fine, but all of a sudden when adding a bit more complexity I’m starting to get really strange frame buffer artifacts. I’ve been unable to screen capture them though but I might be able to take a photograph later this week. It seems like I’ve hit some performance / bandwidth limit that isn’t handled gracefully.  
  
  
  
  
  
What I’m seeing is that parts of the frame buffer suddenly drops out in tiles (that’s why I suspect the gfx hardware actually). Sometimes it just render some background in a tile but then skips the foreground. Some places aren’t updated at all and shows remains from a previous frame etc.  
  
  
  
  
  
Any ideas what might cause this? And how I can avoid it?

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**Author:** ![jackasser](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jackasser](https://forums.imgtec.com/u/jackasser)\
**Post date:** [April 12, 2012, 6:08pm UTC](https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380/2 "2012-04-12T18:08:45Z")

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I have been able to capture some screens now. To whom may I email them?

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**Author:** ![marco](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.imgtec.com/marco/32/96_2.png) [@marco](https://forums.imgtec.com/u/marco)\
**Post date:** [April 13, 2012, 7:15am UTC](https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380/3 "2012-04-13T07:15:07Z")

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Hi JackAsser,  
  
send them to [devtech@imgtec.com](mailto:devtech@imgtec.com) please.  
  
Thanks,  
Marco

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**Author:** ![jackasser](https://avatars.discourse-cdn.com/v4/letter/j/5fc32e/32.png) [@jackasser](https://forums.imgtec.com/u/jackasser)\
**Post date:** [April 13, 2012, 7:25am UTC](https://forums.imgtec.com/t/the-pvr-tile-engine-freaking-out/1380/4 "2012-04-13T07:25:14Z")

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Hi Marco!  
  
  
  
  
  
Thanks, sent!  
  
  
  
  
  
/Andreas