Fix -Game no matieral error

Source/UShaderLabBuilder/Private/MaterialExpressionShaderLabParameterAnchor.cpp

@@ -0,0 +1,57 @@
+// Copyright UShaderLab. All Rights Reserved.
+
+#include "MaterialExpressionShaderLabParameterAnchor.h"
+
+#include "MaterialCompiler.h"
+
+UMaterialExpressionShaderLabParameterAnchor::UMaterialExpressionShaderLabParameterAnchor(const FObjectInitializer& ObjectInitializer)
+	: Super(ObjectInitializer)
+{
+}
+
+#if WITH_EDITOR
+TArrayView<FExpressionInput*> UMaterialExpressionShaderLabParameterAnchor::GetInputsView()
+{
+	CachedInputs.Reset(Inputs.Num());
+	for (FExpressionInput& Input : Inputs)
+	{
+		CachedInputs.Add(&Input);
+	}
+	return CachedInputs;
+}
+
+FExpressionInput* UMaterialExpressionShaderLabParameterAnchor::GetInput(int32 InputIndex)
+{
+	return Inputs.IsValidIndex(InputIndex) ? &Inputs[InputIndex] : nullptr;
+}
+
+FName UMaterialExpressionShaderLabParameterAnchor::GetInputName(int32 InputIndex) const
+{
+	return FName(*FString::Printf(TEXT("Param%d"), InputIndex));
+}
+
+int32 UMaterialExpressionShaderLabParameterAnchor::Compile(FMaterialCompiler* Compiler, int32 OutputIndex)
+{
+	// Compiled in the before-attributes pass. Compiling each input forces its static-switch selector
+	// (and the selected `#define`-emitting Custom node) to compile here — emitting `#define <Switch> 0/1`
+	// for the current permutation ahead of every body's `#if`. The returned value is unused.
+	int32 Last = INDEX_NONE;
+	for (FExpressionInput& Input : Inputs)
+	{
+		if (Input.GetTracedInput().Expression)
+		{
+			const int32 Code = Input.Compile(Compiler);
+			if (Code != INDEX_NONE)
+			{
+				Last = Code;
+			}
+		}
+	}
+	return Last != INDEX_NONE ? Last : Compiler->Constant(0.0f);
+}
+
+void UMaterialExpressionShaderLabParameterAnchor::GetCaption(TArray<FString>& OutCaptions) const
+{
+	OutCaptions.Add(TEXT("ShaderLab Static-Switch Defines / Parameter Anchor"));
+}
+#endif // WITH_EDITOR