eric mcdaniel 502749c59a Fix for async compute on platforms with memory boundary restrictions on async compute dispatch indirect arguments ...

*** This change will incur a full shader invalidation across all platforms ***

Issues:
  - Some platforms require async compute dispatch indirect arguments to not cross specific memory boundaries
    - This places restrictions on the valid sizes for a dispatch indirect argument set.  We were not conforming to these restrictions which could result in GPU crashes on these async passes

Fixes:
  - FRHIDispatchIndirectParameters is padded out to meet per-platform memory boundary restrictions
    - This is driven via new per-platform preprocessor define PLATFORM_DISPATCH_INDIRECT_ARGUMENT_BOUNDARY_SIZE
    - Some platforms require FRHIDispatchIndirectParameters to align with their internal structure hence we cannot universally size to meet all platform's requirements

  - Introduce new FRHIDispatchIndirectParametersNoPadding for uses when we explicitly do not want the padding and otherwise avoid the memory boundary restrictions

  - Revise and expand indirect argument validation code to catch further such issues in the future

  - Update shaders which write to dispatch indirect argument buffers to account for optional per-platform padding
    - New utility function WriteDispatchIndirectArgs introduced to faciliate this
    - platforms which require other than the default nonpadded dispatch indirect arguments must define DISPATCH_INDIRECT_UINT_COUNT and their own WriteDispatchIndirectArgs in their CommonPlatform.ush

  - move creation of DispatchIndirectGraphicsCommandSignature command signature to be per-platform
    - DispatchIndirectGraphicsCommandSignature and DispatchIndirectComputeCommandSignature stride changed to account for additional padding on impacted platforms

Testing:
  - ran Lyra with and without async compute Lumen on impacted platforms as well as Win64
  - ran FN replay on impacted platforms

#rb Krzysztof.Narkowicz, Ben.Woodhouse, Benjamin.Rouveyrol
#jira UE-167950
#preflight 6359563b2e6690262a11bc06

[CL 22862498 by eric mcdaniel in ue5-main branch]

2022-10-31 10:15:11 -04:00

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ClearUAV.usf

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DrawTexture.usf

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DumpTexture.usf

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FullscreenVertexShader.usf

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SetupIndirectArgs.usf

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VisualizeTexture.usf

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