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

Ian Romanick idr at freedesktop.org
Thu Jan 3 11:44:01 PST 2013

On 01/02/2013 11:25 AM, Paul Berry wrote:
> On 2 January 2013 10:55, Ian Romanick <idr at freedesktop.org
> <mailto: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().


Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

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