140 lines
4.4 KiB
C++
140 lines
4.4 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#include "Materials/MaterialExpressionLandscapeLayerWeight.h"
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#include "Engine/Engine.h"
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#include "Engine/Texture.h"
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#include "EngineGlobals.h"
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#include "MaterialCompiler.h"
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#include "Materials/Material.h"
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#include "LandscapeUtilsPrivate.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(MaterialExpressionLandscapeLayerWeight)
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#define LOCTEXT_NAMESPACE "Landscape"
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///////////////////////////////////////////////////////////////////////////////
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// UMaterialExpressionLandscapeLayerWeight
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///////////////////////////////////////////////////////////////////////////////
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UMaterialExpressionLandscapeLayerWeight::UMaterialExpressionLandscapeLayerWeight(const FObjectInitializer& ObjectInitializer)
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: Super(ObjectInitializer)
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{
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// Structure to hold one-time initialization
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struct FConstructorStatics
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{
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FText NAME_Landscape;
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FConstructorStatics()
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: NAME_Landscape(LOCTEXT("Landscape", "Landscape"))
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{
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}
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};
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static FConstructorStatics ConstructorStatics;
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#if WITH_EDITORONLY_DATA
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MenuCategories.Add(ConstructorStatics.NAME_Landscape);
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#endif
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PreviewWeight = 0.0f;
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ConstBase = FVector(0.f, 0.f, 0.f);
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}
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void UMaterialExpressionLandscapeLayerWeight::PostLoad()
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{
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Super::PostLoad();
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if (GetLinkerUEVersion() < VER_UE4_FIXUP_TERRAIN_LAYER_NODES)
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{
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UpdateParameterGuid(true, true);
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}
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}
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#if WITH_EDITOR
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bool UMaterialExpressionLandscapeLayerWeight::IsResultMaterialAttributes(int32 OutputIndex)
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{
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bool bLayerIsMaterialAttributes = Layer.Expression != nullptr && Layer.Expression->IsResultMaterialAttributes(Layer.OutputIndex);
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bool bBaseIsMaterialAttributes = Base.Expression != nullptr && Base.Expression->IsResultMaterialAttributes(Base.OutputIndex);
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return bLayerIsMaterialAttributes || bBaseIsMaterialAttributes;
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}
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int32 UMaterialExpressionLandscapeLayerWeight::Compile(class FMaterialCompiler* Compiler, int32 OutputIndex)
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{
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const bool bTextureArrayEnabled = UE::Landscape::Private::UseWeightmapTextureArray(Compiler->GetShaderPlatform());
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const int32 BaseCode = Base.Expression
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? Base.Compile(Compiler)
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: Compiler->Constant3(static_cast<float>(ConstBase.X), static_cast<float>(ConstBase.Y), static_cast<float>(ConstBase.Z));
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const int32 WeightCode = Compiler->StaticTerrainLayerWeight(ParameterName, Compiler->Constant(PreviewWeight), bTextureArrayEnabled);
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int32 ReturnCode = INDEX_NONE;
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if (WeightCode == INDEX_NONE)
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{
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ReturnCode = BaseCode;
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}
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else
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{
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const int32 LayerCode = Layer.Compile(Compiler);
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ReturnCode = Compiler->Add(BaseCode, Compiler->Mul(LayerCode, WeightCode));
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}
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if (ReturnCode != INDEX_NONE && //If we've already failed for some other reason don't bother with this check. It could have been the reentrant check causing this to loop infinitely!
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Layer.Expression != nullptr && Base.Expression != nullptr &&
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Layer.Expression->IsResultMaterialAttributes(Layer.OutputIndex) != Base.Expression->IsResultMaterialAttributes(Base.OutputIndex))
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{
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Compiler->Error(TEXT("Cannot mix MaterialAttributes and non MaterialAttributes nodes"));
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}
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return ReturnCode;
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}
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#endif // WITH_EDITOR
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UObject* UMaterialExpressionLandscapeLayerWeight::GetReferencedTexture() const
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{
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return GEngine->WeightMapPlaceholderTexture;
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}
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UMaterialExpression::ReferencedTextureArray UMaterialExpressionLandscapeLayerWeight::GetReferencedTextures() const
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{
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return { GEngine->WeightMapPlaceholderTexture, GEngine->WeightMapArrayPlaceholderTexture };
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}
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#if WITH_EDITOR
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FString UMaterialExpressionLandscapeLayerWeight::GetEditableName() const
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{
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return ParameterName.ToString();
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}
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void UMaterialExpressionLandscapeLayerWeight::SetEditableName(const FString& NewName)
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{
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ParameterName = *NewName;
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}
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void UMaterialExpressionLandscapeLayerWeight::GetCaption(TArray<FString>& OutCaptions) const
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{
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OutCaptions.Add(TEXT("Landscape Layer Weight"));
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OutCaptions.Add(FString::Printf(TEXT("'%s'"), *ParameterName.ToString()));
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}
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bool UMaterialExpressionLandscapeLayerWeight::MatchesSearchQuery(const TCHAR* SearchQuery)
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{
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TArray<FString> Captions;
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GetCaption(Captions);
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for (const FString& Caption : Captions)
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{
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if (Caption.Contains(SearchQuery))
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{
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return true;
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}
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}
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return Super::MatchesSearchQuery(SearchQuery);
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}
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void UMaterialExpressionLandscapeLayerWeight::GetLandscapeLayerNames(TArray<FName>& OutLayers) const
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{
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OutLayers.AddUnique(ParameterName);
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}
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#endif // WITH_EDITOR
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#undef LOCTEXT_NAMESPACE
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