Enable Vulkan on RTXDI branch

Development Programming & Scripting
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1

Hi,

I trying to enable Vulkan in this branch https://github.com/NvRTX/UnrealEngine/tree/nvrtx-5.3 from nvidia since it only supports DX.

So for that, I did the following:
I set GMaxRHIShaderPlatform to be SP_VULKAN_SM6 because bit number 51 is 1 and then in RenderUtils.cpp the following condition will be true:

if (GRHISupportsRayTracing && bRayTracingAllowedOnCurrentPlatform)

in DataDrivenPlatformInfo.ini I have set bSupportsRayTracingShaders to true so bAllowPipeline in DeferredShadingRenderer.cpp will be true.

I am now getting an error:

project/proj/Saved/ShaderDebugInfo/VULKAN_SM6/Global/FLumenRadianceCacheHardwareRayTracingRGS/7"
D:/Idriss/unrealengine/Engine/Shaders/Private/RayTracing/RayTracingLightingCommon.ush(504,32): Shader FLumenRadianceCacheHardwareRayTracingRGS, Permutation 7, VF None:
	/Engine/Private/RayTracing/RayTracingLightingCommon.ush(504,32): error: use of undeclared identifier 'FarFieldReferencePos'
	                        FarFieldShadowRay.Origin += FarFieldReferencePos;

followed by this error:

LogWindows: Error: appError called: Fatal error: [File:d:\Idriss\unrealengine\Engine\Source\Runtime\RenderCore\Private\ShaderParameterStruct.cpp] [Line: 385] 
Shader FOcclusionRGS, permutation 140 has unbound parameters not represented in the parameter struct:
  bSceneLightingChannelsValid
  Light_InvRadius
  Light_Direction
  Light_SourceRadius
  LightingChannelMask
  NormalBias
  LightScissor
  PixelOffset
  TraceDistance
  LODTransitionStart
  LODTransitionEnd
  AvoidSelfIntersectionTraceDistance
  bTransmissionSamplingDistanceCulling
  TransmissionSamplingTechnique
  TransmissionMeanFreePathType
  RejectionSamplingTrials
  bAcceptFirstHit
  bTwoSidedGeometry
  MaxBiasForInexactGeometry
  bUseHairVoxel

is there any solution for that?

Thanks,
Idriss

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