MeshDescriptionCommitter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
 
#include "MeshDescription.h"
#include "UObject/Interface.h"
#include "TargetInterfaces/MeshTargetInterfaceTypes.h"
 
#include "MeshDescriptionCommitter.generated.h"
 
UINTERFACE(MinimalAPI)
class UMeshDescriptionCommitter : public UInterface
{
    GENERATED_BODY()
};
 
class IMeshDescriptionCommitter
{
    GENERATED_BODY()
 
public:
 
    virtual bool CommitMeshDescription(const FMeshDescription& Mesh, const FCommitMeshParameters& CommitParams = FCommitMeshParameters() )
    {
        // It seems reasonable to have this function, but we'll go ahead and give a default implementation
        // if users want to just implement the other one.
        bool bSuccess = false;
        CommitMeshDescription([&](const FCommitterParams& CommitParams)
        {
            if (CommitParams.MeshDescriptionOut)
            {
                *CommitParams.MeshDescriptionOut = Mesh;
                bSuccess = true;
            }
        }, CommitParams);
        return bSuccess;
    }
 
 
    virtual bool CommitMeshDescription(FMeshDescription&& Mesh, const FCommitMeshParameters& CommitParams = FCommitMeshParameters())
    {
        // It seems reasonable to have this function, but we'll go ahead and give a default implementation
        // if users want to just implement the other one.
        bool bSuccess = false;
        CommitMeshDescription([&](const FCommitterParams& CommitParams)
        {
            if (CommitParams.MeshDescriptionOut)
            {
                *CommitParams.MeshDescriptionOut = MoveTemp(Mesh);
                bSuccess = true;
            }
        }, CommitParams);
        return bSuccess;
    }
 
    virtual TArray<int32> GetPolygonGroupToMaterialIndexMap() const
    {
        return TArray<int32>();
    }
 
protected:
 
    struct FCommitterParams
    {
        FMeshDescription* MeshDescriptionOut  = nullptr;
    };
    using FCommitter = TFunction<void(const FCommitterParams&)>;
 
    virtual void CommitMeshDescription(const FCommitter& Committer, const FCommitMeshParameters& CommitParams = FCommitMeshParameters()) = 0;
 
};