AnimNode_PoseHandler.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "Animation/AnimationAsset.h"
#include "Animation/PoseAsset.h"
#include "Animation/AnimNode_AssetPlayerBase.h"
#include "AnimNode_PoseHandler.generated.h"
 
// Evaluates a point in an anim sequence, using a specific time input rather than advancing time internally.
// Typically the playback position of the animation for this node will represent something other than time, like jump height.
// This node will not trigger any notifies present in the associated sequence.
USTRUCT(BlueprintInternalUseOnly)
struct FAnimNode_PoseHandler : public FAnimNode_AssetPlayerBase
{
    GENERATED_USTRUCT_BODY()
public:
    // The animation sequence asset to evaluate
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Settings, meta = (PinHiddenByDefault))
    TObjectPtr<UPoseAsset> PoseAsset;
 
public: 
    FAnimNode_PoseHandler()
        :PoseAsset(nullptr)
    {
    }
 
    // FAnimNode_AssetPlayerBase interface
    virtual float GetCurrentAssetTime() const { return 0.f; }
    virtual float GetCurrentAssetLength() const { return 0.f; }
    // End of FAnimNode_AssetPlayerBase interface
 
    // 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 UpdateAssetPlayer(const FAnimationUpdateContext& Context) override;
    ANIMGRAPHRUNTIME_API virtual void GatherDebugData(FNodeDebugData& DebugData) override;
    // End of FAnimNode_Base interface
 
    // FAnimNode_AssetPlayerBase Interface
    virtual float GetAccumulatedTime() const {return 0.f;}
    virtual void SetAccumulatedTime(float NewTime) {}
    virtual UAnimationAsset* GetAnimAsset() const {return PoseAsset;}
    // End of FAnimNode_AssetPlayerBase Interface
 
#if WITH_EDITORONLY_DATA
    // Set the pose asset to use for this node 
    ANIMGRAPHRUNTIME_API void SetPoseAsset(UPoseAsset* InPoseAsset);
#endif
    
protected:
    virtual void OnPoseAssetChange() {}
 
    TWeakObjectPtr<UPoseAsset> CurrentPoseAsset;
    FAnimExtractContext PoseExtractContext;
    // weight to blend pose per joint - has to be cached whenever cache bones for LOD
    // note this is for mesh bone
    TArray<float> BoneBlendWeights;
 
    /* Rebuild pose list */
    ANIMGRAPHRUNTIME_API virtual void RebuildPoseList(const FBoneContainer& InBoneContainer, const UPoseAsset* InPoseAsset);
 
    ANIMGRAPHRUNTIME_API void CacheBoneBlendWeights(FAnimInstanceProxy* InstanceProxy);
    
private:
    ANIMGRAPHRUNTIME_API void UpdatePoseAssetProperty(struct FAnimInstanceProxy* InstanceProxy);
};