panfrost/midgard: Implement upscaling type converts

Rather than using a dest_override, we upscale integers by using a half
field with a sign-extend bit. A variant of this trick should also work
for floats, but one step at a time!

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
1 file changed