Forums - glPolygonOffset problems

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glPolygonOffset problems
marcin.lysniewski
Join Date: 11 Aug 14
Posts: 1
Posted: Thu, 2014-10-16 02:41
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Hi there,

I've been having some troubles with getting glPolyginOffset to work correctly on certain Adreno powered devices. Lately it has been Amazon Kindle Fire HDX 7'' with Adreno 330 and driver  [email protected] AU@  (CL@3851443). On Nexus 5 updated to the latest system version everything works correctly, while on Fire HDX objects with glPolygonOffset applied to them always render on top. Kindle Fire behaves as if it used 16 bit depth buffer, but i double checked, and the depth buffer is 24 bit. The same thing happens on Sony Xperia SP (unfortunately I don't have driver number currently) but doesn't on Nexus 4 (both of those devices have Adreno 320 GPU)

 

The odd thing is, that when i capture the frame in Adreno Profiler everything renders correctly. Because of that, I am unable to track down the issue.

 

I would be very grateful if someone could shed light on my issue.

 

Best Regards

Marcin

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Re: glPolygonOffset problems
mhfeldma Moderator
Join Date: 29 Nov 12
Posts: 310
Posted: Fri, 2014-10-17 13:38
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Our most recent drivers have corrected the glPolygonOffset calculations to have the offset be more inline with the depth buffer precision.  The profiler uses an emulated desktop implementation which differs slightly from that in the mobile drivers.

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