[Mesa-dev] [PATCH v2 2/2] st/mesa: provide GL_OES_copy_image support by caching the original ETC data

[Matt Turner]

On Sat, Jul 16, 2016 at 9:21 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
> The additional provision of GL_OES_copy_image is that it work for ETC.
> However many desktop GPUs don't have native ETC support, so st/mesa does
> the decoding by hand. Instead of discarding the compressed data, keep it
> around in CPU memory. Use it when performing image copies.
>
> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>

Although the bug is filed against i965 specifically, there is
https://bugs.freedesktop.org/show_bug.cgi?id=81843