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499 lines
18 KiB
C++
499 lines
18 KiB
C++
// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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ShaderParameterStruct.cpp: Shader parameter struct implementations.
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=============================================================================*/
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#include "ShaderParameterStruct.h"
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/** Context of binding a map. */
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struct FShaderParameterStructBindingContext
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{
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// Shader having its parameter bound.
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const FShader* Shader;
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// Bindings to bind.
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FShaderParameterBindings* Bindings;
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// The shader parameter map from the compilation.
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const FShaderParameterMap* ParametersMap;
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// Map of global shader name that were bound to C++ members.
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TMap<FString, FString> ShaderGlobalScopeBindings;
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// C++ name of the render target binding slot.
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FString RenderTargetBindingSlotCppName;
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// Whether this is for legacy shader parameter settings, or root shader parameter structures/
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bool bUseRootShaderParameters;
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void Bind(
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const FShaderParametersMetadata& StructMetaData,
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const TCHAR* MemberPrefix,
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uint32 GeneralByteOffset)
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{
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const TArray<FShaderParametersMetadata::FMember>& StructMembers = StructMetaData.GetMembers();
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for (const FShaderParametersMetadata::FMember& Member : StructMembers)
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{
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EUniformBufferBaseType BaseType = Member.GetBaseType();
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FString CppName = FString::Printf(TEXT("%s::%s"), StructMetaData.GetStructTypeName(), Member.GetName());
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// Ignore rasterizer binding slots entirely since this actually have nothing to do with a shader.
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if (BaseType == UBMT_RENDER_TARGET_BINDING_SLOTS)
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{
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if (!RenderTargetBindingSlotCppName.IsEmpty())
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{
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UE_LOG(LogShaders, Fatal, TEXT("Render target binding slots collision: %s & %s"),
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*RenderTargetBindingSlotCppName, *CppName);
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}
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RenderTargetBindingSlotCppName = CppName;
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continue;
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}
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// Compute the shader member name to look for according to nesting.
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FString ShaderBindingName = FString::Printf(TEXT("%s%s"), MemberPrefix, Member.GetName());
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uint16 ByteOffset = uint16(GeneralByteOffset + Member.GetOffset());
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check(uint32(ByteOffset) == GeneralByteOffset + Member.GetOffset());
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const uint32 ArraySize = Member.GetNumElements();
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const bool bIsArray = ArraySize > 0;
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const bool bIsRHIResource = (
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BaseType == UBMT_TEXTURE ||
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BaseType == UBMT_SRV ||
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BaseType == UBMT_UAV ||
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BaseType == UBMT_SAMPLER);
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const bool bIsRDGResource = IsRDGResourceReferenceShaderParameterType(BaseType) && BaseType != UBMT_RDG_BUFFER;
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const bool bIsVariableNativeType = (
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BaseType == UBMT_BOOL ||
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BaseType == UBMT_INT32 ||
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BaseType == UBMT_UINT32 ||
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BaseType == UBMT_FLOAT32);
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if (BaseType == UBMT_INCLUDED_STRUCT)
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{
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checkf(!bIsArray, TEXT("Array of included structure is impossible."));
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Bind(
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*Member.GetStructMetadata(),
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/* MemberPrefix = */ MemberPrefix,
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/* GeneralByteOffset = */ ByteOffset);
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continue;
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}
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else if (BaseType == UBMT_NESTED_STRUCT && bIsArray)
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{
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const FShaderParametersMetadata* ChildStruct = Member.GetStructMetadata();
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uint32 StructSize = ChildStruct->GetSize();
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for (uint32 ArrayElementId = 0; ArrayElementId < (bIsArray ? ArraySize : 1u); ArrayElementId++)
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{
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FString NewPrefix = FString::Printf(TEXT("%s%s_%d_"), MemberPrefix, Member.GetName(), ArrayElementId);
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Bind(
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*ChildStruct,
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/* MemberPrefix = */ *NewPrefix,
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/* GeneralByteOffset = */ ByteOffset + ArrayElementId * StructSize);
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}
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continue;
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}
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else if (BaseType == UBMT_NESTED_STRUCT && !bIsArray)
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{
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FString NewPrefix = FString::Printf(TEXT("%s%s_"), MemberPrefix, Member.GetName());
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Bind(
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*Member.GetStructMetadata(),
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/* MemberPrefix = */ *NewPrefix,
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/* GeneralByteOffset = */ ByteOffset);
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continue;
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}
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else if (BaseType == UBMT_REFERENCED_STRUCT)
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{
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checkf(!bIsArray, TEXT("Array of referenced structure is not supported, because the structure is globally unicaly named."));
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// The member name of a globally referenced struct is the not name on the struct.
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ShaderBindingName = Member.GetStructMetadata()->GetShaderVariableName();
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}
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else if (BaseType == UBMT_RDG_BUFFER)
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{
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// RHI does not support setting a buffer as a shader parameter.
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check(!bIsArray);
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if( ParametersMap->ContainsParameterAllocation(*ShaderBindingName) )
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{
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UE_LOG(LogShaders, Fatal, TEXT("%s can't bind shader parameter %s as buffer. Use buffer SRV for reading in shader."), *CppName, *ShaderBindingName);
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}
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continue;
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}
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else if (bUseRootShaderParameters && bIsVariableNativeType)
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{
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// Constants are stored in the root shader parameter cbuffer when bUseRootShaderParameters == true.
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continue;
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}
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const bool bIsResourceArray = bIsArray && (bIsRHIResource || bIsRDGResource);
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for (uint32 ArrayElementId = 0; ArrayElementId < (bIsResourceArray ? ArraySize : 1u); ArrayElementId++)
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{
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FString ElementShaderBindingName;
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if (bIsResourceArray)
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{
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if (0) // HLSLCC does not support array of resources.
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ElementShaderBindingName = FString::Printf(TEXT("%s[%d]"), *ShaderBindingName, ArrayElementId);
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else
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ElementShaderBindingName = FString::Printf(TEXT("%s_%d"), *ShaderBindingName, ArrayElementId);
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}
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else
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{
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ElementShaderBindingName = ShaderBindingName;
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}
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if (ShaderGlobalScopeBindings.Contains(ElementShaderBindingName))
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{
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UE_LOG(LogShaders, Fatal, TEXT("%s can't bind shader parameter %s, because it has already be bound by %s."), *CppName, *ElementShaderBindingName, **ShaderGlobalScopeBindings.Find(ShaderBindingName));
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}
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uint16 BufferIndex, BaseIndex, BoundSize;
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if (!ParametersMap->FindParameterAllocation(*ElementShaderBindingName, BufferIndex, BaseIndex, BoundSize))
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{
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continue;
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}
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ShaderGlobalScopeBindings.Add(ElementShaderBindingName, CppName);
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if (bIsVariableNativeType)
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{
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checkf(ArrayElementId == 0, TEXT("The entire array should be bound instead for RHI parameter submission performance."));
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uint32 ByteSize = Member.GetMemberSize();
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FShaderParameterBindings::FParameter Parameter;
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Parameter.BufferIndex = BufferIndex;
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Parameter.BaseIndex = BaseIndex;
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Parameter.ByteOffset = ByteOffset;
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Parameter.ByteSize = BoundSize;
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if (uint32(BoundSize) > ByteSize)
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{
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UE_LOG(LogShaders, Fatal, TEXT("The size required to bind shader %s's (Permutation Id %d) struct %s parameter %s is %i bytes, smaller than %s's %i bytes."),
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Shader->GetType()->GetName(), Shader->GetPermutationId(), StructMetaData.GetStructTypeName(),
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*ElementShaderBindingName, BoundSize, *CppName, ByteSize);
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}
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Bindings->Parameters.Add(Parameter);
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}
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else if (BaseType == UBMT_REFERENCED_STRUCT)
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{
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check(!bIsArray);
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FShaderParameterBindings::FParameterStructReference Parameter;
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Parameter.BufferIndex = BufferIndex;
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Parameter.ByteOffset = ByteOffset;
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Bindings->ParameterReferences.Add(Parameter);
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}
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else if (bIsRHIResource || bIsRDGResource)
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{
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FShaderParameterBindings::FResourceParameter Parameter;
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Parameter.BaseIndex = BaseIndex;
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Parameter.ByteOffset = ByteOffset + ArrayElementId * SHADER_PARAMETER_POINTER_ALIGNMENT;
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checkf(
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BoundSize == 1,
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TEXT("The shader compiler should give precisely which elements of an array did not get compiled out, ")
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TEXT("for optimal automatic render graph pass dependency with ClearUnusedGraphResources()."));
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if (BaseType == UBMT_TEXTURE)
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Bindings->Textures.Add(Parameter);
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else if (BaseType == UBMT_SRV)
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Bindings->SRVs.Add(Parameter);
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else if (BaseType == UBMT_UAV)
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Bindings->UAVs.Add(Parameter);
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else if (BaseType == UBMT_SAMPLER)
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Bindings->Samplers.Add(Parameter);
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else if (BaseType == UBMT_RDG_TEXTURE)
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Bindings->GraphTextures.Add(Parameter);
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else if (BaseType == UBMT_RDG_TEXTURE_SRV || BaseType == UBMT_RDG_BUFFER_SRV)
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Bindings->GraphSRVs.Add(Parameter);
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else // if (BaseType == UBMT_RDG_TEXTURE_UAV || BaseType == UBMT_RDG_BUFFER_UAV)
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Bindings->GraphUAVs.Add(Parameter);
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}
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else
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{
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checkf(0, TEXT("Unexpected base type for a shader parameter struct member."));
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}
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} // for (uint32 ArrayElementId = 0; ArrayElementId < (bIsResourceArray ? ArraySize : 1u); ArrayElementId++)
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} // for (const FShaderParametersMetadata::FMember& Member : StructMembers)
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} // void Bind()
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}; // struct FShaderParameterStructBindingContext
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void FShaderParameterBindings::BindForLegacyShaderParameters(const FShader* Shader, const FShaderParameterMap& ParametersMap, const FShaderParametersMetadata& StructMetaData, bool bShouldBindEverything)
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{
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checkf(StructMetaData.GetSize() < (1 << (sizeof(uint16) * 8)), TEXT("Shader parameter structure can only have a size < 65536 bytes."));
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check(this == &Shader->Bindings);
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switch (Shader->GetType()->GetFrequency())
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{
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case SF_Vertex:
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case SF_Hull:
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case SF_Domain:
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case SF_Pixel:
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case SF_Geometry:
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case SF_Compute:
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break;
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default:
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checkf(0, TEXT("Invalid shader frequency for this shader binding technique."));
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break;
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}
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FShaderParameterStructBindingContext BindingContext;
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BindingContext.Shader = Shader;
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BindingContext.Bindings = this;
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BindingContext.ParametersMap = &ParametersMap;
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BindingContext.bUseRootShaderParameters = false;
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BindingContext.Bind(
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StructMetaData,
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/* MemberPrefix = */ TEXT(""),
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/* ByteOffset = */ 0);
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RootParameterBufferIndex = kInvalidBufferIndex;
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TArray<FString> AllParameterNames;
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ParametersMap.GetAllParameterNames(AllParameterNames);
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if (bShouldBindEverything && BindingContext.ShaderGlobalScopeBindings.Num() != AllParameterNames.Num())
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{
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FString ErrorString = FString::Printf(
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TEXT("Shader %s has unbound parameters not represented in the parameter struct:"), Shader->GetType()->GetName());
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for (const FString& GlobalParameterName : AllParameterNames)
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{
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if (!BindingContext.ShaderGlobalScopeBindings.Contains(GlobalParameterName))
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{
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ErrorString += FString::Printf(TEXT("\n %s"), *GlobalParameterName);
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}
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}
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UE_LOG(LogShaders, Fatal, TEXT("%s"), *ErrorString);
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}
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}
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void FShaderParameterBindings::BindForRootShaderParameters(const FShader* Shader, const FShaderParameterMap& ParametersMap)
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{
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check(this == &Shader->Bindings);
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check(Shader->GetType()->GetRootParametersMetadata());
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const FShaderParametersMetadata& StructMetaData = *Shader->GetType()->GetRootParametersMetadata();
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checkf(StructMetaData.GetSize() < (1 << (sizeof(uint16) * 8)), TEXT("Shader parameter structure can only have a size < 65536 bytes."));
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switch (Shader->GetType()->GetFrequency())
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{
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case SF_RayGen:
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case SF_RayMiss:
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case SF_RayHitGroup:
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case SF_RayCallable:
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break;
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default:
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checkf(0, TEXT("Invalid shader frequency for this shader binding technic."));
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break;
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}
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FShaderParameterStructBindingContext BindingContext;
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BindingContext.Shader = Shader;
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BindingContext.Bindings = this;
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BindingContext.ParametersMap = &ParametersMap;
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BindingContext.bUseRootShaderParameters = true;
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BindingContext.Bind(
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StructMetaData,
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/* MemberPrefix = */ TEXT(""),
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/* ByteOffset = */ 0);
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// Binds the uniform buffer that contains the root shader parameters.
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{
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const TCHAR* ShaderBindingName = FShaderParametersMetadata::kRootUniformBufferBindingName;
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uint16 BufferIndex, BaseIndex, BoundSize;
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if (ParametersMap.FindParameterAllocation(ShaderBindingName, BufferIndex, BaseIndex, BoundSize))
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{
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BindingContext.ShaderGlobalScopeBindings.Add(ShaderBindingName, ShaderBindingName);
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RootParameterBufferIndex = BufferIndex;
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}
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else
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{
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check(RootParameterBufferIndex == FShaderParameterBindings::kInvalidBufferIndex);
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}
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}
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TArray<FString> AllParameterNames;
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ParametersMap.GetAllParameterNames(AllParameterNames);
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if (BindingContext.ShaderGlobalScopeBindings.Num() != AllParameterNames.Num())
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{
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FString ErrorString = FString::Printf(
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TEXT("Shader %s has unbound parameters not represented in the parameter struct:"), Shader->GetType()->GetName());
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for (const FString& GlobalParameterName : AllParameterNames)
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{
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if (!BindingContext.ShaderGlobalScopeBindings.Contains(GlobalParameterName))
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{
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ErrorString += FString::Printf(TEXT("\n %s"), *GlobalParameterName);
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}
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}
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UE_LOG(LogShaders, Fatal, TEXT("%s"), *ErrorString);
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}
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}
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bool FRenderTargetBinding::Validate() const
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{
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if (Texture)
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{
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checkf(StoreAction != ERenderTargetStoreAction::ENoAction,
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TEXT("You must specify a store action for non-null render target %s."),
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Texture->Name);
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}
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else
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{
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checkf(LoadAction == ERenderTargetLoadAction::ENoAction && StoreAction == ERenderTargetStoreAction::ENoAction,
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TEXT("Can't have a load or store action when no texture is bound."));
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}
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return true;
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}
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bool FDepthStencilBinding::Validate() const
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{
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if (Texture)
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{
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EPixelFormat PixelFormat = Texture->Desc.Format;
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const TCHAR* FormatString = GetPixelFormatString(PixelFormat);
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bool bIsDepthFormat = PixelFormat == PF_DepthStencil || PixelFormat == PF_ShadowDepth || PixelFormat == PF_D24;
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checkf(bIsDepthFormat,
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TEXT("Can't bind texture %s as a depth stencil because its pixel format is %s."),
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Texture->Name, FormatString);
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checkf(DepthStencilAccess != FExclusiveDepthStencil::DepthNop_StencilNop,
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TEXT("Why binding texture %s if there is no access?"),
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Texture->Name);
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bool bHasStencil = PixelFormat == PF_DepthStencil;
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if (!bHasStencil)
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{
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checkf(StencilLoadAction == ERenderTargetLoadAction::ENoAction && StencilStoreAction == ERenderTargetStoreAction::ENoAction,
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TEXT("Unable to load stencil of texture %s that have a pixel format %s that does not support stencil."),
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Texture->Name, FormatString);
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checkf(!DepthStencilAccess.IsUsingStencil(),
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TEXT("Unable to have stencil access on texture %s that have a pixel format %s that does not support stencil."),
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Texture->Name, FormatString);
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}
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}
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else
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{
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checkf(DepthLoadAction == ERenderTargetLoadAction::ENoAction && DepthStoreAction == ERenderTargetStoreAction::ENoAction,
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TEXT("Can't have a depth load or store action when no texture are bound."));
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checkf(StencilLoadAction == ERenderTargetLoadAction::ENoAction && StencilStoreAction == ERenderTargetStoreAction::ENoAction,
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TEXT("Can't have a stencil load or store action when no texture are bound."));
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checkf(DepthStencilAccess == FExclusiveDepthStencil::DepthNop_StencilNop,
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TEXT("Can't have a depth stencil access when no texture are bound."));
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}
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return true;
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}
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void EmitNullShaderParameterFatalError(const FShader* Shader, const FShaderParametersMetadata* ParametersMetadata, uint16 MemberOffset)
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{
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const FShaderParametersMetadata* MemberContainingStruct = nullptr;
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const FShaderParametersMetadata::FMember* Member = nullptr;
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int32 ArrayElementId = 0;
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FString NamePrefix;
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ParametersMetadata->FindMemberFromOffset(MemberOffset, &MemberContainingStruct, &Member, &ArrayElementId, &NamePrefix);
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FString MemberName = FString::Printf(TEXT("%s%s"), *NamePrefix, Member->GetName());
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if (Member->GetNumElements() > 0)
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{
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MemberName = FString::Printf(TEXT("%s%s[%d]"), *NamePrefix, Member->GetName(), ArrayElementId);
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}
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const TCHAR* ShaderClassName = Shader->GetType()->GetName();
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UE_LOG(LogShaders, Fatal,
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TEXT("%s's required shader parameter %s::%s was not set."),
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ShaderClassName,
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ParametersMetadata->GetStructTypeName(),
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*MemberName);
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}
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#if DO_CHECK
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void ValidateShaderParameters(const FShader* Shader, const FShaderParametersMetadata* ParametersMetadata, const void* Parameters)
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{
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const FShaderParameterBindings& Bindings = Shader->Bindings;
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const uint8* Base = reinterpret_cast<const uint8*>(Parameters);
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// Textures
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.Textures)
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{
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FRHITexture* ShaderParameterRef = *(FRHITexture**)(Base + ParameterBinding.ByteOffset);
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if (!ShaderParameterRef)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
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}
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}
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// SRVs
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.SRVs)
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{
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FRHIShaderResourceView* ShaderParameterRef = *(FRHIShaderResourceView**)(Base + ParameterBinding.ByteOffset);
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if (!ShaderParameterRef)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
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}
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}
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// Samplers
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.Samplers)
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{
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FRHISamplerState* ShaderParameterRef = *(FRHISamplerState**)(Base + ParameterBinding.ByteOffset);
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if (!ShaderParameterRef)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
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}
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}
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// Graph Textures
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.GraphTextures)
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{
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auto GraphTexture = *reinterpret_cast<const FRDGTexture* const*>(Base + ParameterBinding.ByteOffset);
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if (!GraphTexture)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
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}
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}
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// Graph SRVs
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.GraphSRVs)
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{
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auto GraphSRV = *reinterpret_cast<const FRDGTextureSRV* const*>(Base + ParameterBinding.ByteOffset);
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if (!GraphSRV)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
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}
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}
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// Graph UAVs for compute shaders
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for (const FShaderParameterBindings::FResourceParameter& ParameterBinding : Bindings.GraphUAVs)
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{
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auto GraphUAV = *reinterpret_cast<const FRDGTextureUAV* const*>(Base + ParameterBinding.ByteOffset);
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if (!GraphUAV)
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{
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EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
|
|
}
|
|
}
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|
|
|
// Reference structures
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|
for (const FShaderParameterBindings::FParameterStructReference& ParameterBinding : Bindings.ParameterReferences)
|
|
{
|
|
const TRefCountPtr<FRHIUniformBuffer>& ShaderParameterRef = *reinterpret_cast<const TRefCountPtr<FRHIUniformBuffer>*>(Base + ParameterBinding.ByteOffset);
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|
|
|
if (!ShaderParameterRef.IsValid())
|
|
{
|
|
EmitNullShaderParameterFatalError(Shader, ParametersMetadata, ParameterBinding.ByteOffset);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif // DO_CHECK
|