Jiawei Shao 829d165d7c D3D12: Support [[num_workgroups]] for DispatchIndirect
This patch supports [[num_workgroups]] on D3D12 for DispatchIndirect
by appending the values of [[num_workgroups]] at the end of the
scratch buffer for indirect dispatch validation and setting them as
the root constants in the command signature.

With this patch, for every DispatchIndirect call:
- On D3D12:
1. Validation enabled, [[num_workgroups]] is used
The dispatch indirect buffer needs to be validated, duplicated and
be written into a scratch buffer (size: 6 * uint32_t).

2. Validation enabled, [[num_workgroups]] isn't used
The dispatch indirect buffer needs to be validated and be written
into a scratch buffer (size: 3 * uint32_t).

3. Validation disabled, [[num_workgroups]] is used
The dispatch indirect buffer needs to be duplicated and be written
into a scratch buffer (size: 6 * uint32_t).

4. Validation disabled, [[num_workgroups]] isn't used
Neither transformations or scratch buffers are needed for the dispatch
call.

- On the other backends:
1. Validation enabled,
The dispatch indirect buffer needs to be validated and be written
into a scratch buffer (size: 3 * uint32_t).

2. Validation disabled,
Neither transformations or scratch buffers are needed for the dispatch
call.

BUG=dawn:839
TEST=dawn_end2end_tests

Change-Id: I4105f1b2e3c12f6df6e487ed535a627fbb342344
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/68843
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
2021-11-17 05:00:44 +00:00
..
2021-11-02 09:30:52 +00:00