http://bugs.freedesktop.org/show_bug.cgi?id=26525
Summary: Rendering bug due to ARB_texture_non_power_of_two
Product: Mesa
Version: git
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/R600
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: ppa...@shaw.ca
While trying to address a D3D rendering bug report in Wine, I've been working
on trying to add card recognition support into Wine for the Mesa ATI
(R300/R600) drivers. This was in order to resolve a rendering issue when using
the Mesa ATI driver. What we've found is that a code workaround to avoid using
ARB_texture_non_power_of_two APIs on R300-R500 cards also seems to fix this
rendering issue on Mesa DRI R600 (in particular with an HD4800 series card).
This would seem to indicate a bug in the ARP texture_non_power_of_two
implementation on R600. The Wine bug report is at
http://bugs.winehq.org/show_bug.cgi?id=21515
Comments #45-47 indicate that the rendering problem is "fixed" by activating a
"quirk"/workaround that avoids ARB_texture_non_power_of_two. Stefan Dosinger's
comment #48 indicates what the "quirk" workaround does, how it should not be
required on an R600/R700 series card, and how that indicates a probable driver
bug.
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