Bug 27338 - Mipmap tiling problem
Summary: Mipmap tiling problem
Status: CLOSED FIXED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/r300 (show other bugs)
Version: git
Hardware: All Linux (All)
: medium normal
Assignee: Default DRI bug account
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Reported: 2010-03-26 23:56 UTC by Mathias Fröhlich
Modified: 2010-03-27 06:15 UTC (History)
0 users

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Attachments
Fix for the mipmap problem (784 bytes, patch)
2010-03-26 23:56 UTC, Mathias Fröhlich 		Details | Splinter Review
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Description Mathias Fröhlich 2010-03-26 23:56:55 UTC 
Created attachment 34501 [details] [review]
Fix for the mipmap problem

Hi,

Since the tiling changes in the r300g driver I have observed problems with non square textures in some mipmap levels. I have not nailed the problem down to a specific level or a specific texture size, but the attached patch looks plausible to me and fixes some fallout I observed since these patches with my favourite OpenSceneGraph test model displayed in osgviewer.

Please review/apply.

Mathias
Comment 1 Marek Olšák 2010-03-27 06:15:17 UTC 
Somehow when the texture height is at least 4x smaller than a macro-tile, the hw switches back to macro-linear. I'd say this is an undocumented hw behavior rather than a bug in stride calculation or something like that.

So thanks for the patch, tested and pushed. Closing...

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