This should be able to handle partial copies of multisampled images.
This change extends our blit shader interface to also handle multisampled
destinations so that if the blit destination is a multisampled image,
the blit will rely on sample rate shading to copy all samples from
the source image (which must have a matching number of samples).
I have not found any tests in CTS that do partial copies of
multisampled images, so I tested this with a full multisampled image
copy, using this test:
dEQP-VK.api.copy_and_blit.core.resolve_image.whole_copy_before_resolving.4_bit
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6766>
Iago Toral Quiroga
3310c1542c