http://bugs.freedesktop.org/show_bug.cgi?id=23122
Summary: mipmap_comp_tests will cause radeon_validate_texture
error
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/Radeon
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: srol...@tungstengraphics.com
this should happen on all radeons since radeon-rewrite. The issue here is that
if texture images are specified from level 0 to some level, but if because of
gl state (baselevel, maxlod etc.) the actually needed textures for rendering go
from level x (!=0) to some level, miptree comparison will fail. The driver then
will try to create another tree, but since it does try this only with level 0
as base it will always fail (with the error message "radeon_validate_texture
failed to alloc miptree") if the calculated required firstlevel is not 0.
Note that actually there's another bug here since the fallback then always
segfaults, but I didn't look at this.
I'm not actually sure what the intention of the code how to handle this is, but
note that on r300 and up this should probably be fixed by not messing with the
miptree at all when the required base level changes, since these chips can
easily clamp both min and max levels. However, miptree changes are required for
r100/r200 (which can only clamp the smallest mipmap used).
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