tree b15abad1110fdf1ea4b381c2cf6207a1db0d36c2
parent 1c2a039e04acae0f42f036c9434982de1471efaa
author Yunchao He <yunchao.he@intel.com> 1592245922 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1592245922 +0000

D3D12: use one barrier to transit states for all subresources

If a texture's old states of all subresources are the same, and its
new states are the same too, then we can use one barrier to transit
states for all subresources. We don't need to use one barrier per
each subresource.

This change can reduce barriers we dispatched, in order to improve
performance for particular situations.

Bug: dawn:441

Change-Id: I9fe9dabda725e05d4ce5a8e69ee7b40e6724a22a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/23145
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>