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// Copyright 2025 https://yuewu.dev/en All Rights Reserved.
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#include "Nodes/GMS_AnimNode_LayeredBoneBlend.h"
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#include "AnimationRuntime.h"
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#include "Animation/AnimInstanceProxy.h"
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#include "Animation/AnimTrace.h"
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#include "Animation/AnimCurveTypes.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(GMS_AnimNode_LayeredBoneBlend)
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/////////////////////////////////////////////////////
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// FGMS_AnimNode_LayeredBoneBlend
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void FGMS_AnimNode_LayeredBoneBlend::Initialize_AnyThread(const FAnimationInitializeContext& Context)
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{
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DECLARE_SCOPE_HIERARCHICAL_COUNTER_ANIMNODE(Initialize_AnyThread)
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FAnimNode_Base::Initialize_AnyThread(Context);
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const int NumPoses = BlendPoses.Num();
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checkSlow(BlendWeights.Num() == NumPoses);
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// initialize children
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BasePose.Initialize(Context);
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if (NumPoses > 0)
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{
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for (int32 ChildIndex = 0; ChildIndex < NumPoses; ++ChildIndex)
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{
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BlendPoses[ChildIndex].Initialize(Context);
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}
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}
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}
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void FGMS_AnimNode_LayeredBoneBlend::RebuildPerBoneBlendWeights(const USkeleton* InSkeleton)
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{
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if (InSkeleton)
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{
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if (ExternalLayerSetup.BranchFilters.IsEmpty())
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{
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FAnimationRuntime::CreateMaskWeights(PerBoneBlendWeights, LayerSetup, InSkeleton);
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}
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else
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{
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for (const FBranchFilter& BranchFilter : ExternalLayerSetup.BranchFilters)
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{
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LayerSetup[0].BranchFilters.Add(BranchFilter);
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}
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FAnimationRuntime::CreateMaskWeights(PerBoneBlendWeights, LayerSetup, InSkeleton);
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}
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SkeletonGuid = InSkeleton->GetGuid();
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VirtualBoneGuid = InSkeleton->GetVirtualBoneGuid();
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}
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}
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bool FGMS_AnimNode_LayeredBoneBlend::ArePerBoneBlendWeightsValid(const USkeleton* InSkeleton) const
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{
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return (InSkeleton != nullptr && InSkeleton->GetGuid() == SkeletonGuid && InSkeleton->GetVirtualBoneGuid() == VirtualBoneGuid);
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}
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void FGMS_AnimNode_LayeredBoneBlend::UpdateCachedBoneData(const FBoneContainer& RequiredBones, const USkeleton* Skeleton)
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{
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if (LayerSetup.IsValidIndex(0) && LayerSetup[0].BranchFilters.IsEmpty())
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{
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RebuildPerBoneBlendWeights(Skeleton);
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}
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// if(RequiredBones.GetSerialNumber() == RequiredBonesSerialNumber)
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// {
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// return;
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// }
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if (!ArePerBoneBlendWeightsValid(Skeleton))
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{
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RebuildPerBoneBlendWeights(Skeleton);
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}
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// build desired bone weights
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const TArray<FBoneIndexType>& RequiredBoneIndices = RequiredBones.GetBoneIndicesArray();
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const int32 NumRequiredBones = RequiredBoneIndices.Num();
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DesiredBoneBlendWeights.SetNumZeroed(NumRequiredBones);
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for (int32 RequiredBoneIndex=0; RequiredBoneIndex<NumRequiredBones; RequiredBoneIndex++)
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{
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const int32 SkeletonBoneIndex = RequiredBones.GetSkeletonIndex(FCompactPoseBoneIndex(RequiredBoneIndex));
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if (ensure(SkeletonBoneIndex != INDEX_NONE))
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{
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DesiredBoneBlendWeights[RequiredBoneIndex] = PerBoneBlendWeights[SkeletonBoneIndex];
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}
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}
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CurrentBoneBlendWeights.Reset(DesiredBoneBlendWeights.Num());
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CurrentBoneBlendWeights.AddZeroed(DesiredBoneBlendWeights.Num());
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//Reinitialize bone blend weights now that we have cleared them
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FAnimationRuntime::UpdateDesiredBoneWeight(DesiredBoneBlendWeights, CurrentBoneBlendWeights, BlendWeights);
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// Build curve source indices
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{
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// Get the original Reserve value
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int32 OriginalReserve = CurvePoseSourceIndices.Max();
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CurvePoseSourceIndices.Empty();
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Skeleton->ForEachCurveMetaData([this, &RequiredBones](const FName& InCurveName, const FCurveMetaData& InMetaData)
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{
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for (const FBoneReference& LinkedBone : InMetaData.LinkedBones)
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{
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FCompactPoseBoneIndex CompactPoseIndex = LinkedBone.GetCompactPoseIndex(RequiredBones);
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if (CompactPoseIndex != INDEX_NONE)
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{
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if (DesiredBoneBlendWeights[CompactPoseIndex.GetInt()].BlendWeight > 0.f)
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{
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CurvePoseSourceIndices.Add(InCurveName, DesiredBoneBlendWeights[CompactPoseIndex.GetInt()].SourceIndex);
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break;
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}
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}
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}
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});
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// Shrink afterwards to exactly what was used if the Reserve increased, to save memory. Eventually the reserve will
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// stabilize at the maximum number of nodes actually used in practice for this specific anim node.
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if (CurvePoseSourceIndices.Num() > OriginalReserve)
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{
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CurvePoseSourceIndices.Shrink();
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}
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}
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RequiredBonesSerialNumber = RequiredBones.GetSerialNumber();
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LayerSetup[0].BranchFilters.Reset();
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}
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void FGMS_AnimNode_LayeredBoneBlend::CacheBones_AnyThread(const FAnimationCacheBonesContext& Context)
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{
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DECLARE_SCOPE_HIERARCHICAL_COUNTER_ANIMNODE(CacheBones_AnyThread)
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BasePose.CacheBones(Context);
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int32 NumPoses = BlendPoses.Num();
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for(int32 ChildIndex=0; ChildIndex<NumPoses; ChildIndex++)
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{
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BlendPoses[ChildIndex].CacheBones(Context);
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}
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UpdateCachedBoneData(Context.AnimInstanceProxy->GetRequiredBones(), Context.AnimInstanceProxy->GetSkeleton());
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}
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void FGMS_AnimNode_LayeredBoneBlend::Update_AnyThread(const FAnimationUpdateContext& Context)
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{
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DECLARE_SCOPE_HIERARCHICAL_COUNTER_ANIMNODE(Update_AnyThread)
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bHasRelevantPoses = false;
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int32 RootMotionBlendPose = -1;
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float RootMotionWeight = 0.f;
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const float RootMotionClearWeight = bBlendRootMotionBasedOnRootBone ? 0.f : 1.f;
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if (IsLODEnabled(Context.AnimInstanceProxy))
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{
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GetEvaluateGraphExposedInputs().Execute(Context);
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for (int32 ChildIndex = 0; ChildIndex < BlendPoses.Num(); ++ChildIndex)
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{
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const float ChildWeight = BlendWeights[ChildIndex];
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if (FAnimWeight::IsRelevant(ChildWeight))
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{
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if (bHasRelevantPoses == false)
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{
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// Update cached data now we know we might be valid
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UpdateCachedBoneData(Context.AnimInstanceProxy->GetRequiredBones(), Context.AnimInstanceProxy->GetSkeleton());
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// Update weights
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FAnimationRuntime::UpdateDesiredBoneWeight(DesiredBoneBlendWeights, CurrentBoneBlendWeights, BlendWeights);
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bHasRelevantPoses = true;
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if(bBlendRootMotionBasedOnRootBone && !CurrentBoneBlendWeights.IsEmpty())
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{
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const float NewRootMotionWeight = CurrentBoneBlendWeights[0].BlendWeight;
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if(NewRootMotionWeight > ZERO_ANIMWEIGHT_THRESH)
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{
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RootMotionWeight = NewRootMotionWeight;
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RootMotionBlendPose = CurrentBoneBlendWeights[0].SourceIndex;
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}
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}
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}
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const float ThisPoseRootMotionWeight = (ChildIndex == RootMotionBlendPose) ? RootMotionWeight : RootMotionClearWeight;
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BlendPoses[ChildIndex].Update(Context.FractionalWeightAndRootMotion(ChildWeight, ThisPoseRootMotionWeight));
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}
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}
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}
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// initialize children
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const float BaseRootMotionWeight = 1.f - RootMotionWeight;
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if (BaseRootMotionWeight < ZERO_ANIMWEIGHT_THRESH)
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{
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BasePose.Update(Context.FractionalWeightAndRootMotion(1.f, BaseRootMotionWeight));
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}
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else
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{
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BasePose.Update(Context);
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}
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TRACE_ANIM_NODE_VALUE(Context, TEXT("Num Poses"), BlendPoses.Num());
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}
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void FGMS_AnimNode_LayeredBoneBlend::Evaluate_AnyThread(FPoseContext& Output)
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{
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DECLARE_SCOPE_HIERARCHICAL_COUNTER_ANIMNODE(Evaluate_AnyThread)
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ANIM_MT_SCOPE_CYCLE_COUNTER(BlendPosesInGraph, !IsInGameThread());
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const int NumPoses = BlendPoses.Num();
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if ((NumPoses == 0) || !bHasRelevantPoses)
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{
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BasePose.Evaluate(Output);
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}
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else
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{
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FPoseContext BasePoseContext(Output);
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// evaluate children
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BasePose.Evaluate(BasePoseContext);
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TArray<FCompactPose> TargetBlendPoses;
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TargetBlendPoses.SetNum(NumPoses);
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TArray<FBlendedCurve> TargetBlendCurves;
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TargetBlendCurves.SetNum(NumPoses);
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TArray<UE::Anim::FStackAttributeContainer> TargetBlendAttributes;
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TargetBlendAttributes.SetNum(NumPoses);
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for (int32 ChildIndex = 0; ChildIndex < NumPoses; ++ChildIndex)
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{
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if (FAnimWeight::IsRelevant(BlendWeights[ChildIndex]))
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{
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FPoseContext CurrentPoseContext(Output);
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BlendPoses[ChildIndex].Evaluate(CurrentPoseContext);
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TargetBlendPoses[ChildIndex].MoveBonesFrom(CurrentPoseContext.Pose);
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TargetBlendCurves[ChildIndex].MoveFrom(CurrentPoseContext.Curve);
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TargetBlendAttributes[ChildIndex].MoveFrom(CurrentPoseContext.CustomAttributes);
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}
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else
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{
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TargetBlendPoses[ChildIndex].ResetToRefPose(BasePoseContext.Pose.GetBoneContainer());
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TargetBlendCurves[ChildIndex].InitFrom(Output.Curve);
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}
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}
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// filter to make sure it only includes curves that are linked to the correct bone filter
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UE::Anim::FNamedValueArrayUtils::RemoveByPredicate(BasePoseContext.Curve, CurvePoseSourceIndices,
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[](const UE::Anim::FCurveElement& InOutBasePoseElement, const UE::Anim::FCurveElementIndexed& InSourceIndexElement)
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{
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// if source index is set, remove base pose curve value
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return (InSourceIndexElement.Index != INDEX_NONE);
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});
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// Filter child pose curves
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for (int32 ChildIndex = 0; ChildIndex < NumPoses; ++ChildIndex)
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{
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UE::Anim::FNamedValueArrayUtils::RemoveByPredicate(TargetBlendCurves[ChildIndex], CurvePoseSourceIndices,
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[ChildIndex](const UE::Anim::FCurveElement& InOutBasePoseElement, const UE::Anim::FCurveElementIndexed& InSourceIndexElement)
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{
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// if not source, remove it
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return (InSourceIndexElement.Index != INDEX_NONE) && (InSourceIndexElement.Index != ChildIndex);
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});
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}
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FAnimationRuntime::EBlendPosesPerBoneFilterFlags BlendFlags = FAnimationRuntime::EBlendPosesPerBoneFilterFlags::None;
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if (bMeshSpaceRotationBlend)
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{
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BlendFlags |= FAnimationRuntime::EBlendPosesPerBoneFilterFlags::MeshSpaceRotation;
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}
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if (bMeshSpaceScaleBlend)
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{
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BlendFlags |= FAnimationRuntime::EBlendPosesPerBoneFilterFlags::MeshSpaceScale;
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}
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FAnimationPoseData AnimationPoseData(Output);
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FAnimationRuntime::BlendPosesPerBoneFilter(BasePoseContext.Pose, TargetBlendPoses, BasePoseContext.Curve, TargetBlendCurves, BasePoseContext.CustomAttributes, TargetBlendAttributes, AnimationPoseData, CurrentBoneBlendWeights, BlendFlags, CurveBlendOption);
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}
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}
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void FGMS_AnimNode_LayeredBoneBlend::GatherDebugData(FNodeDebugData& DebugData)
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{
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DECLARE_SCOPE_HIERARCHICAL_COUNTER_ANIMNODE(GatherDebugData)
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const int NumPoses = BlendPoses.Num();
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FString DebugLine = DebugData.GetNodeName(this);
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DebugLine += FString::Printf(TEXT("(Num Poses: %i)"), NumPoses);
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DebugData.AddDebugItem(DebugLine);
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BasePose.GatherDebugData(DebugData.BranchFlow(1.f));
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for (int32 ChildIndex = 0; ChildIndex < NumPoses; ++ChildIndex)
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{
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BlendPoses[ChildIndex].GatherDebugData(DebugData.BranchFlow(BlendWeights[ChildIndex]));
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}
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}
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