BlendProfileScratchData.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Animation/AnimSlotEvaluationPose.h"
#include "CoreMinimal.h"
#include "HAL/ThreadSingleton.h"
 
struct FCompactPose;
struct FBlendedCurve;
namespace UE { namespace Anim { struct FStackAttributeContainer; } }
 
struct FBlendProfileScratchData : public TThreadSingleton<FBlendProfileScratchData>
{
    // @todo: TArray<TArray<>> allocations are not preserved during resets. We should either implement a new TArrayOfArrays container
    // or change the deallocation policy perhaps via template specialization?
 
    TArray<TArray<float>> PerBoneWeights;       // A set of bone weights, per montage instance. Index this like [PoseIndex][CompactPoseBoneIndex].
    TArray<float> PerBoneWeightTotals;          // The bone weight totals for non-additive poses, used for normalizing weights.
    TArray<float> PerBoneWeightTotalsAdditive;  // The bone weight totals for additive poses, used for normalizing weights.
    TArray<float> BoneBlendProfileScales;       // The bone profile scale values.
 
    TArray<FSlotEvaluationPose> Poses;          // Non additive poses.
    TArray<FSlotEvaluationPose> AdditivePoses;  // Additive poses.
 
    TArray<uint8, TInlineAllocator<8>> PoseIndices;         // The indices inside the PerBoneWeights array, for non additive poses.
    TArray<uint8, TInlineAllocator<8>> AdditivePoseIndices; // The indices inside the PerBoneWeights array, for additive poses.
 
    TArray<float, TInlineAllocator<8>> BlendingWeights;                 // The per pose blend weights.
    TArray<const FCompactPose*, TInlineAllocator<8>> BlendingPoses;     // The non additive poses to blend.
    TArray<const FBlendedCurve*, TInlineAllocator<8>> BlendingCurves;   // The curves to blend.
    TArray<const UE::Anim::FStackAttributeContainer*, TInlineAllocator<8>> BlendingAttributes;  // The attributes to blend.
 
    void Reset()
    {
        PerBoneWeights.Reset();
        PerBoneWeightTotals.Reset();
        PerBoneWeightTotalsAdditive.Reset();
        BoneBlendProfileScales.Reset();
        Poses.Reset();
        AdditivePoses.Reset();
        PoseIndices.Reset();
        AdditivePoseIndices.Reset();
        BlendingWeights.Reset();
        BlendingPoses.Reset();
        BlendingCurves.Reset();
        BlendingAttributes.Reset();
    }
 
    bool IsEmpty() const
    {
        return PerBoneWeights.IsEmpty() &&
            PerBoneWeightTotals.IsEmpty() &&
            PerBoneWeightTotalsAdditive.IsEmpty() &&
            BoneBlendProfileScales.IsEmpty() &&
            Poses.IsEmpty() &&
            AdditivePoses.IsEmpty() &&
            PoseIndices.IsEmpty() &&
            AdditivePoseIndices.IsEmpty() &&
            BlendingWeights.IsEmpty() &&
            BlendingPoses.IsEmpty() &&
            BlendingCurves.IsEmpty() &&
            BlendingAttributes.IsEmpty();
    }
};