http://bugs.freedesktop.org/show_bug.cgi?id=21692
Summary: i945_miptree_layout_cube is not right for i945GM
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/i915
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: sgunder...@bigfoot.com
Created an attachment (id=25757)
--> (http://bugs.freedesktop.org/attachment.cgi?id=25757)
Test case source code
Mesa has separate i915 and i945 texture layout code for cubemaps, differing for
4x4 and lower mip levels. However, on my i945, the i945 code
(i945_miptree_layout_cube()) seems not to be right at all.
I made a small test program (attached) that makes a 64x64 cubemap and renders
all faces at all mip levels. cubemap-i945-code.png is what it looks like in
Mesa 7.4.1 + the patch from bug 21691. cubemap-i915-code.png is what it looks
like if I tell Mesa to simply use i915_miptree_layout_cube() instead, which is
identical to how ATI and nVidia cards render it (and how it's intended).
Without hardware specs it's hard to say, but some has said that the i945 layout
may be relevant (only) for compressed textures. It should probably be
investigated.
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