[Mesa-dev] [PATCH] i965: Fix glCompressedTexSubImage2D offsets for ETC textures.

Paul Berry stereotype441 at gmail.com
Wed Jan 2 11:25:30 PST 2013

On 2 January 2013 10:55, Ian Romanick <idr at freedesktop.org> wrote:

> On 12/29/2012 11:50 AM, Paul Berry wrote:
>> This patch fixes intel_miptree_unmap_etc() (which decompresses ETC
>> textures to linear) to pay attention to map->x and map->y when writing
>> to the destination image.  Previously these values were ignored,
>> causing the xoffset and yoffset parameters passed to
>> glCompressedTexSubImage2D() to be ignored.
> I recall that ETC has additional restrictions on subimage updates.  Do we
> correctly respect those?

Yes, I believe what Mesa implements is correct:

For ETC1, subimage updates are prohibited, and we respect that by returning
true from compressedteximage_only_format().

For ETC2, subimage updates are allowed provided that xoffset, yoffset,
height, and width are aligned to 4x4 block boundaries, and we check that
properly in error_check_subtexture_dimensions().
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