http://bugs.freedesktop.org/show_bug.cgi?id=21693
Summary: i945 support for compressed cubemaps is completely
broken
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=25761)
--> (http://bugs.freedesktop.org/attachment.cgi?id=25761)
Test case source code
i945 hardware supports compressed cube maps. However, it seems like the texture
memory layout completely forgets to handle the fact that they take up less
memory.
I've made a small test program (attached; basically the same as in bugs 21691
and 21692, only with DXT1 instead of uncompressed textures) that creates a
64x64 cubemap and renders all faces at all mip levels. reference-cubemap.png is
what it looks like on ATI and nVidia (well, actually, that's a white lie; in
reality the colors are slightly wrong since DXT1 is 565 instead of 888, but you
get the general idea). i945-compressed-cubemap.png is what it looks like on my
i945 with unmodified Mesa 7.4.1. i945-compressed-cubemap-with-hack.png is what
it looks like if I change the call to intel_miptree_set_image_offset() in
i945_miptree_layout_cube() from
intel_miptree_set_image_offset(mt, level, face, x, y);
to
intel_miptree_set_image_offset(mt, level, face, x, y/4);
Of course, it's a hack, and it still doesn't work properly for the lower mip
levels (probably related to bugs 21690 and/or 21691), but at least it shows
that the layout has to be adjusted for lower memory use.
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