ClothingSimulationCacheData.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "Containers/Array.h"
#include "Containers/Map.h"
#include "Math/Transform.h"
#include "Math/Vector.h"
 
struct FClothingSimulationCacheData
{
    // Solver space cached positions for the kinematics targets. (Sparse--use CacheIndices to map to full)
    TArray<FVector> CachedPositions;
 
    // Solver space cached velocities for the kinematics targets. (Sparse--use CacheIndices to map to full)
    TArray<FVector> CachedVelocities;
 
    // Indices used to map from CachedPositions/Velocities to solver indices
    TArray<int32> CacheIndices;
 
    // Cached ReferenceSpaceTransform per cloth. Key is Cloth GroupId
    TMap<int32, FTransform> CachedReferenceSpaceTransforms;
 
    FClothingSimulationCacheData() = default;
    FClothingSimulationCacheData(const FClothingSimulationCacheData& Other) = default;
    FClothingSimulationCacheData(FClothingSimulationCacheData&& Other)
        : CachedPositions(MoveTemp(Other.CachedPositions))
        , CachedVelocities(MoveTemp(Other.CachedVelocities))
        , CacheIndices(MoveTemp(Other.CacheIndices))
        , CachedReferenceSpaceTransforms(MoveTemp(Other.CachedReferenceSpaceTransforms))
    {}
 
    FClothingSimulationCacheData& operator=(const FClothingSimulationCacheData& Other) = default;
    FClothingSimulationCacheData& operator=(FClothingSimulationCacheData&& Other)
    {
        CachedPositions = MoveTemp(Other.CachedPositions);
        CachedVelocities = MoveTemp(Other.CachedVelocities);
        CacheIndices = MoveTemp(Other.CacheIndices);
        CachedReferenceSpaceTransforms = MoveTemp(Other.CachedReferenceSpaceTransforms);
        return *this;
    }
 
    void Reset()
    {
        CachedPositions.Reset();
        CachedVelocities.Reset();
        CacheIndices.Reset();
        CachedReferenceSpaceTransforms.Reset();
    }
 
    bool HasData() const
    {
        checkSlow(CachedPositions.Num() == CacheIndices.Num());
        return CacheIndices.Num() > 0;
    }
};