From cd8748873f556f689a534f92cb0aed64fc1701cf Mon Sep 17 00:00:00 2001
From: Ryan <73148864+Ryan-000@users.noreply.github.com>
Date: Mon, 20 Apr 2026 16:05:02 -0400
Subject: [PATCH] Move dirty filter state from AnimationNode to
 AnimationNodeInstance

---
 scene/animation/animation_tree.cpp | 14 +++++++++++---
 scene/animation/animation_tree.h   |  5 ++++-
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/scene/animation/animation_tree.cpp b/scene/animation/animation_tree.cpp
index 7addfb6252..4d0558196a 100644
--- a/scene/animation/animation_tree.cpp
+++ b/scene/animation/animation_tree.cpp
@@ -349,18 +349,25 @@ void AnimationNode::set_filter_path(const NodePath &p_path, bool p_enable) {
 	} else {
 		filter.erase(p_path);
 	}
-	filters_dirty = true;
+	_mark_filters_dirty();
 }
 
 void AnimationNode::set_filter_enabled(bool p_enable) {
 	filter_enabled = p_enable;
-	filters_dirty = true;
+	_mark_filters_dirty();
 }
 
 bool AnimationNode::is_filter_enabled() const {
 	return filter_enabled;
 }
 
+void AnimationNode::_mark_filters_dirty() {
+	filters_version++;
+	if (unlikely(filters_version == 0)) {
+		filters_version = 1;
+	}
+}
+
 void AnimationNode::set_deletable(bool p_closable) {
 	closable = p_closable;
 }
@@ -408,6 +415,7 @@ void AnimationNode::_set_filters(const Array &p_filters) {
 }
 
 void AnimationNode::_update_filter_cache(const ProcessState &p_process_state, const AnimationNodeInstance &p_instance) {
+	bool filters_dirty = p_instance.filters_version != filters_version;
 	if (!p_process_state.track_map_updated && !filters_dirty) {
 		return; // Cache is valid.
 	}
@@ -422,7 +430,7 @@ void AnimationNode::_update_filter_cache(const ProcessState &p_process_state, co
 			p_instance.filtered_track_indices_cache.push_back(*p);
 		}
 	}
-	filters_dirty = false;
+	p_instance.filters_version = filters_version;
 }
 
 void AnimationNode::_validate_property(PropertyInfo &p_property) const {
diff --git a/scene/animation/animation_tree.h b/scene/animation/animation_tree.h
index 6e46adc454..a57f9ca969 100644
--- a/scene/animation/animation_tree.h
+++ b/scene/animation/animation_tree.h
@@ -66,7 +66,6 @@ public:
 	LocalVector<Input> inputs;
 	HashSet<NodePath> filter;
 	bool filter_enabled = false;
-	bool filters_dirty = true;
 
 	// To propagate information from upstream for use in estimation of playback progress.
 	// These values must be taken from the result of blend_node() or blend_input() and must be essentially read-only.
@@ -179,6 +178,9 @@ protected:
 	GDVIRTUAL4R(double, _process, double, bool, bool, bool)
 	GDVIRTUAL0RC(String, _get_caption)
 	GDVIRTUAL0RC(bool, _has_filter)
+private:
+	mutable uint32_t filters_version = 1;
+	void _mark_filters_dirty();
 
 public:
 	virtual void get_parameter_list(LocalVector<PropertyInfo> *r_list) const;
@@ -266,6 +268,7 @@ struct AnimationNodeInstance {
 	mutable LocalVector<AnimationNodeInstance *> connection_instances; // AnimationNodeInstance* | nullptr
 	mutable LocalVector<real_t> track_weights;
 	mutable LocalVector<int> filtered_track_indices_cache;
+	mutable uint32_t filters_version = 0;
 	mutable AHashMap<StringName, AnimationNodeInstance *> child_instances; // Child Name -> AnimationNodeInstance*
 
 	// Multiple AnimationNodeInstances can share the same resource btw.