LandscapeWeightmapUsage.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
 
#include "LandscapeWeightmapUsage.generated.h"
 
class ULandscapeComponent;
 
UCLASS(MinimalAPI, NotBlueprintable)
class ULandscapeWeightmapUsage : public UObject
{
    GENERATED_UCLASS_BODY()
 
    enum { NumChannels = 4 };
 
public:
    UPROPERTY()
    TObjectPtr<ULandscapeComponent> ChannelUsage[NumChannels];
 
    UPROPERTY()
    FGuid LayerGuid;
 
    int32 FreeChannelCount() const
    {
        int32 Count = 0;
 
        for (int8 i = 0; i < NumChannels; ++i)
        {
            Count += (ChannelUsage[i] == nullptr) ? 1 : 0;
        }
 
        return  Count;
    }
 
    void ClearUsage()
    {
        for (int8 i = 0; i < NumChannels; ++i)
        {
            ChannelUsage[i] = nullptr;
        }
    }
 
    void ClearUsage(ULandscapeComponent* Component)
    {
        for (int8 i = 0; i < NumChannels; ++i)
        {
            if (ChannelUsage[i] == Component)
            {
                ChannelUsage[i] = nullptr;
            }
        }
    }
 
    bool IsEmpty() const
    {
        return FreeChannelCount() == NumChannels;
    }
 
    TArray<ULandscapeComponent*, TInlineAllocator<4>> GetUniqueValidComponents() const
    {
        TArray<ULandscapeComponent*, TInlineAllocator<4>> UniqueComponents;
        for (const TObjectPtr<ULandscapeComponent>& Component : ChannelUsage)
        {
            if (Component != nullptr)
            {
                UniqueComponents.AddUnique(Component);
            }
        }
        return UniqueComponents;
    }
};