AnimNode_MultiWayBlend.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Animation/AnimNodeBase.h"
#include "Animation/InputScaleBias.h"
#include "AnimNode_MultiWayBlend.generated.h"
 
// This represents a baked transition
USTRUCT(BlueprintInternalUseOnly)
struct FAnimNode_MultiWayBlend : public FAnimNode_Base
{
    GENERATED_USTRUCT_BODY()
 
public:
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Links, meta = (BlueprintCompilerGeneratedDefaults))
    TArray<FPoseLink> Poses;
 
    UPROPERTY(EditAnywhere, EditFixedSize, BlueprintReadWrite, Category=Settings, meta=(BlueprintCompilerGeneratedDefaults, PinShownByDefault))
    TArray<float> DesiredAlphas;
 
private:
    TArray<float> CachedAlphas;
 
public:
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Settings)
    FInputScaleBias AlphaScaleBias;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Settings)
    bool bAdditiveNode;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Settings)
    bool bNormalizeAlpha;
 
public:
    FAnimNode_MultiWayBlend()
        : bAdditiveNode(false)
        , bNormalizeAlpha(true)
    {
    }
 
    // FAnimNode_Base interface
    ANIMGRAPHRUNTIME_API virtual void Initialize_AnyThread(const FAnimationInitializeContext& Context) override;
    ANIMGRAPHRUNTIME_API virtual void CacheBones_AnyThread(const FAnimationCacheBonesContext& Context) override;
    ANIMGRAPHRUNTIME_API virtual void Update_AnyThread(const FAnimationUpdateContext& Context) override;
    ANIMGRAPHRUNTIME_API virtual void Evaluate_AnyThread(FPoseContext& Output) override;
    ANIMGRAPHRUNTIME_API virtual void GatherDebugData(FNodeDebugData& DebugData) override;
    // End of FAnimNode_Base interface
 
    int32 AddPose()
    {
        Poses.AddDefaulted();
        DesiredAlphas.AddZeroed();
        UpdateCachedAlphas();
 
        return Poses.Num();
    }
 
    void RemovePose(int32 PoseIndex)
    {
        Poses.RemoveAt(PoseIndex);
        CachedAlphas.RemoveAt(PoseIndex);
        DesiredAlphas.RemoveAt(PoseIndex);
    }
 
    void ResetPoses()
    {
        Poses.Reset();
        CachedAlphas.Reset();
        DesiredAlphas.Reset();
    }
 
    float GetTotalAlpha() const
    {
        float TotalAlpha = 0.f;
 
        for (float Alpha : DesiredAlphas)
        {
            TotalAlpha += Alpha;
        }
 
        return TotalAlpha;
    }
 
private:
    // process new weights and then return out
    ANIMGRAPHRUNTIME_API void UpdateCachedAlphas();
 
    friend class UAnimGraphNode_MultiWayBlend;
};