Bug 27338

Summary:	Mipmap tiling problem
Product:	Mesa	Reporter:	Mathias Fröhlich <Mathias.Froehlich>
Component:	Drivers/DRI/r300	Assignee:	Default DRI bug account <dri-devel>
Status:	CLOSED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	All
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Fix for the mipmap problem

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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