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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>