commit 9680c9f874e484cad9e5235e20f488bdb0aef2c2
author Yunchao He <yunchao.he@intel.com> Thu Jun 03 18:19:06 2021 +0000
committer Dawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com> Thu Jun 03 18:19:06 2021 +0000
tree b33b5d9946fb56e1098e825f616000e4da8a436c
parent fec575ca7b2b7ed87ee7492a4ea907472d67af86

Polish 2D texture copy splitter on D3D12

In every copy region, its bufferSize.height minus rowsPerImage
can be texture format's blockInfo.height (it is 1 for uncompressed
formats) at most, and it appears only if bytesPerRow is 256 and
copySize on height is a full copy.

This change will benefit 3D texture copy splitter via removing
unwanted empty rows issues. Because empty rows in 3D copy splitter
may lead to recompute/modify copy regions and there might be new
copy regions added.

The removed empty row situations are:
  1) Partial copy on height: copySize.height < rowsPerImage *
  blockInfo.height
  2) bytesPerRow is greater than 512. For example, if bytesPerRow
  is 512 and data in one row straddles two rows and there is no
  empty row at the first part. The second part will have a fake
  empty row if we don't recompute its alignedOffset.
  3) There are two empty rows in a copy region. For example:
  if data in one row straddles two rows and there is an empty row
  in the first copy region. Then there will be two empty rows in
  the copy region of the second part if we don't recompute the
  alignedOffset.

This change also fixes an issue found by Corentin that copy related
argument "rowsPerImage" should not take effect when we are copying
one single depth or array slice.

Bug: dawn:547

Change-Id: I603291d559de1d05e420e5ed1f4cabf53de5a93f
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/52680
Reviewed-by: Corentin Wallez <cwallez@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Yunchao He <yunchao.he@intel.com>