This patch adds the validation rules on the texture usage scope with
storage textures in one render pass.
1. Write-only storage cannot be used in combination with anything else
in the same render pass.
2. Sampled and read-only storage are allowed to be used in the same
render pass.
This patch also adds dawn_unittests to test the storage texture usage
scope in one render pass:
1. read-only or write-only storage only
2. read-only or write-only storage + sampled
3. read-only or write-only storage + output attachment
4. read-only + write-only
This patch also removes kWritableBufferUsages as it is not used in Dawn
at all.
BUG=dawn:267
TEST=dawn_unittests
Change-Id: Ib2a0f06ec8d183c5f812f87459c6b1b8f79937e0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/19820
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
e89b48768b