tree a5688d2707cb21e6e90c07bfeeb6908c504de1af
parent d3bf2188aa726cb595b7d799d116f3403167af1d
author Jiawei Shao <jiawei.shao@intel.com> 1594286122 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1594286122 +0000

Implement buffer lazy initialization before CopyBufferToBuffer

This patch implements buffer lazy initialization before
CopyBufferToBuffer() behind the toggle LazyClearBufferOnFirstUse.
- If the source buffer is not initialized, it will be cleared to 0
  before CopyBufferToBuffer().
- If the destination buffer is not initialized and the copy doesn't
  overwrite the whole buffer, it will be cleared to 0 before
  CopyBufferToBuffer(), otherwise the buffer shouldn't be cleared.

BUG=dawn:414
TEST=dawn_end2end_tests

Change-Id: I3d0512c6376a1ed8928e86f8e56fefebc16910fa
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/24360
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>