zach bethel 10131e1285 Refactored RDG in preparation for UnifiedBuffer conversions. ...

- Refactord 'Finalized Access' feature into a more flexible 'External' vs. 'Internal' access mode per resource toggle.
      - Resources can transition between modes multiple times within the graph.
      - Supports async compute pipeline.
      - Supports queueing of requests to avoid back-to-back helper passes.
      - This feature is needed to support conversion of GPU scene buffers.

 - Deprecated the ReadOnly and ForceTracking resource flags and added a 'SkipTracking' flag instead.
      - Previous semantics were confusing and error prone.
      - New model requires a manual flag to tell RDG never to transition a resource.
      - This flag is used for read-only dummy resources as an optimization.

 - Renamed some of the auxiliary 'FinalizedResource' utilities since the name no longer matches the semantics.

#preflight 6266cc6d0634d0904ce4ba46

[CL 19904734 by zach bethel in ue5-main branch]

2022-04-25 13:00:12 -04:00

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