tree 29b2d08649e8eaf447a14bf708b3a7ad547c35fd
parent 8bcfec716a29f21e83e4ed6e8ac378ee6ab87473
author Yunchao He <yunchao.he@intel.com> 1623273632 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1623273632 +0000

Impl 3DTexture copy splitter for empty first row on D3D12 - 2

If the copy region generated from 2D texture copy splitter has an
empty first row due to alignment adjustment and we simply extend
it to all copied depth slices, the copy region will be incorrect
for 3D texture copy.

If there is an empty first row and the copy height is odd, we can
split the copy region into two:
  - copy0: copy the first depth slice
  - copy1: copy the rest depth slices because there is no empty
    row after alignment adjustment

This method resolves the remaining problem when copy height is 1.
It also is an optimization for other odd copy height cases, say
copy height is 3, 5, 7, etc.

This change implements the special situation when the copy region
generated from 2D texture copy splitter has an empty first row and
its copy height is odd.

Bug: dawn:547
Change-Id: Idf4f4a9b87f783c5328463e0f4182429a7e809f1
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/53885
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>