MaterialOverlayHelper.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Containers/Array.h"
#include "Materials/MaterialInterface.h"
#include "UObject/Object.h"
#include "UObject/ObjectMacros.h"
#include "UObject/ObjectPtr.h"
#include "UObject/UObjectGlobals.h"
 
class FMaterialOverlayHelper
{
public:
    static void AppendAllOverlayMaterial(const TArray<TObjectPtr<UMaterialInterface>>& SourceMaterials, TArray<UMaterialInterface*>& OutMaterials, bool& bOutHaveNullEntry)
    {
        bOutHaveNullEntry = false;
        for(const TObjectPtr<UMaterialInterface>& SourceMaterial : SourceMaterials)
        {
            if (SourceMaterial)
            {
                OutMaterials.Add(SourceMaterial);
            }
            else
            {
                bOutHaveNullEntry = true;
            }
        }
    }
 
    static void AppendAllOverlayMaterial(const TArray<TObjectPtr<UMaterialInterface>>& SourceMaterials, TArray<UMaterialInterface*>& OutMaterials)
    {
        bool bHaveNullEntry = false;
        AppendAllOverlayMaterial(SourceMaterials, OutMaterials, bHaveNullEntry);
    }
 
    static void ForceMaterial(TArray<TObjectPtr<UMaterialInterface>>& SourceMaterials, UMaterialInterface* ForceMaterial)
    {
        for (int32 SlotIndex = 0; SlotIndex < SourceMaterials.Num(); ++SlotIndex)
        {
            SourceMaterials[SlotIndex] = ForceMaterial;
        }
    }
 
    static bool ForceMaterial(TArray<TObjectPtr<UMaterialInterface>>& SourceMaterials, const int32 SlotIndex, UMaterialInterface* ForceMaterial)
    {
        if (SourceMaterials.IsValidIndex(SlotIndex))
        {
            SourceMaterials[SlotIndex] = ForceMaterial;
            return true;
        }
        return false;
    }
 
    static UMaterialInterface* GetOverlayMaterial(TArray<TObjectPtr<UMaterialInterface>>& SourceMaterials, const int32 SlotIndex)
    {
        return SourceMaterials.IsValidIndex(SlotIndex) ? SourceMaterials[SlotIndex] : nullptr;
    }
};