tree fc6be74546139f88968194c7229d936459019ff0
parent 8f4046b0b66765d2cb00c9a477e757c4e3e99fe9
author Jiawei Shao <jiawei.shao@intel.com> 1560819969 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1560819969 +0000

Add validations to the texture copies with BC formats

This patch adds the validation on the texture copies with BC formats.
1. BufferCopyView.offset in B2T and T2B copies must be a multiple of the
   compressed texel block size in bytes.
2. BufferCopyView.rowPitch in B2T and T2B copies refers to the number of
   bytes from the start of one row of blocks to the start of the next
   row of blocks.
3. BufferCopyView.imageHeight must be a multiple of the compressed texel
   block height (4 for BC formats).
4. All members in TextureCopyView.origin must be a multiple of the
   corresponding dimensions of the compressed texel block (4x4x1 for BC
   formats).
5. All the mumbers in 'copySize' must be a multiple of the corresponding
   dimensions of the compressed texel block (4x4x1 for BC formats)
   because D3D12 requires the width and height of a texture in BC
   formats must be multiples of 4.
6. Compute the texture size in non-zero mipmap levels with paddings for
   textures in BC formats when necessary.

BUG=dawn:42
TEST=dawn_unittests

Change-Id: Iac8d6c93ab8b37bb46becffd4175339722ab6016
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/7860
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>