From 79d9438132d26c32c46a252036701a0beec1dc59 Mon Sep 17 00:00:00 2001
From: Nathan Sweet <nathan.sweet@gmail.com>
Date: Thu, 15 May 2025 17:03:23 -0400
Subject: [PATCH] [libgdx] Store bones indices on animation for sliders.

---
 .../com/esotericsoftware/spine/Animation.java | 17 +++++++++----
 .../com/esotericsoftware/spine/Slider.java    | 24 ++++++++++---------
 2 files changed, 26 insertions(+), 15 deletions(-)

diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
index e94c4f4b9..ae72d9adc 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
@@ -36,6 +36,7 @@ import static com.esotericsoftware.spine.utils.SpineUtils.*;
 import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.utils.Array;
 import com.badlogic.gdx.utils.FloatArray;
+import com.badlogic.gdx.utils.IntArray;
 import com.badlogic.gdx.utils.Null;
 import com.badlogic.gdx.utils.ObjectSet;
 
@@ -49,15 +50,18 @@ import com.esotericsoftware.spine.attachments.VertexAttachment;
 /** Stores a list of timelines to animate a skeleton's pose over time. */
 public class Animation {
 	final String name;
+	float duration;
 	Array<Timeline> timelines;
 	final ObjectSet<String> timelineIds;
-	float duration;
+	final IntArray bones;
 
 	public Animation (String name, Array<Timeline> timelines, float duration) {
 		if (name == null) throw new IllegalArgumentException("name cannot be null.");
 		this.name = name;
 		this.duration = duration;
-		timelineIds = new ObjectSet(timelines.size << 1);
+		int n = timelines.size << 1;
+		timelineIds = new ObjectSet(n);
+		bones = new IntArray(n);
 		setTimelines(timelines);
 	}
 
@@ -72,9 +76,14 @@ public class Animation {
 
 		int n = timelines.size;
 		timelineIds.clear(n << 1);
+		bones.clear();
 		Timeline[] items = timelines.items;
-		for (int i = 0; i < n; i++)
-			timelineIds.addAll(items[i].getPropertyIds());
+		for (int i = 0; i < n; i++) {
+			Timeline timeline = items[i];
+			timelineIds.addAll(timeline.getPropertyIds());
+			if (timeline instanceof BoneTimeline boneTimeline) bones.add(boneTimeline.getBoneIndex());
+		}
+		bones.shrink();
 	}
 
 	/** Returns true if this animation contains a timeline with any of the specified property IDs. */
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
index 811e9441d..b31e918a8 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slider.java
@@ -29,7 +29,6 @@
 
 package com.esotericsoftware.spine;
 
-import com.esotericsoftware.spine.Animation.BoneTimeline;
 import com.esotericsoftware.spine.Animation.ConstraintTimeline;
 import com.esotericsoftware.spine.Animation.MixBlend;
 import com.esotericsoftware.spine.Animation.MixDirection;
@@ -75,9 +74,9 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 
 		if (p.mix != 1) {
 			Bone[] bones = skeleton.bones.items;
-			Timeline[] timelines = animation.timelines.items;
-			for (int i = 0, n = animation.timelines.size; i < n; i++)
-				if (timelines[i] instanceof BoneTimeline timeline) bones[timeline.getBoneIndex()].applied.modifyLocal(skeleton);
+			int[] indices = animation.bones.items;
+			for (int i = 0, n = animation.bones.size; i < n; i++)
+				bones[indices[i]].applied.modifyLocal(skeleton);
 		}
 
 		animation.apply(skeleton, p.time, p.time, data.loop, null, p.mix, data.additive ? MixBlend.add : MixBlend.replace,
@@ -88,20 +87,23 @@ public class Slider extends Constraint<Slider, SliderData, SliderPose> {
 		if (bone != null && !data.local) skeleton.sortBone(bone);
 		skeleton.updateCache.add(this);
 
-		Timeline[] timelines = data.animation.timelines.items;
 		Bone[] bones = skeleton.bones.items;
+		int[] indices = data.animation.bones.items;
+		for (int i = 0, n = data.animation.bones.size; i < n; i++) {
+			Bone bone = bones[indices[i]];
+			bone.sorted = false;
+			skeleton.sortReset(bone.children);
+			skeleton.constrained(bone);
+		}
+
+		Timeline[] timelines = data.animation.timelines.items;
 		Slot[] slots = skeleton.slots.items;
 		Constraint[] constraints = skeleton.constraints.items;
 		PhysicsConstraint[] physics = skeleton.physics.items;
 		int physicsCount = skeleton.physics.size;
 		for (int i = 0, n = data.animation.timelines.size; i < n; i++) {
 			Timeline t = timelines[i];
-			if (t instanceof BoneTimeline timeline) {
-				Bone bone = bones[timeline.getBoneIndex()];
-				bone.sorted = false;
-				skeleton.sortReset(bone.children);
-				skeleton.constrained(bone);
-			} else if (t instanceof SlotTimeline timeline)
+			if (t instanceof SlotTimeline timeline)
 				skeleton.constrained(slots[timeline.getSlotIndex()]);
 			else if (t instanceof PhysicsConstraintTimeline timeline) {
 				if (timeline.constraintIndex == -1) {