From e9d576185cd04ba83c6ec4c179b19c24a30dca27 Mon Sep 17 00:00:00 2001
From: Nathan Sweet <nathan.sweet@gmail.com>
Date: Tue, 18 Oct 2022 14:34:43 -0400
Subject: [PATCH] [libgdx] Avoid a sqrt for 1 bone IK with stretch/compress.

---
 .../com/esotericsoftware/spine/IkConstraint.java    | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
index a07c96de0..ed585199f 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/IkConstraint.java
@@ -222,11 +222,14 @@ public class IkConstraint implements Updatable {
 				tx = targetX - bone.worldX;
 				ty = targetY - bone.worldY;
 			}
-			float b = bone.data.length * sx, dd = (float)Math.sqrt(tx * tx + ty * ty);
-			if ((compress && dd < b) || (stretch && dd > b) && b > 0.0001f) {
-				float s = (dd / b - 1) * alpha + 1;
-				sx *= s;
-				if (uniform) sy *= s;
+			float b = bone.data.length * sx;
+			if (b > 0.0001f) {
+				float dd = tx * tx + ty * ty;
+				if ((compress && dd < b * b) || (stretch && dd > b * b)) {
+					float s = ((float)Math.sqrt(dd) / b - 1) * alpha + 1;
+					sx *= s;
+					if (uniform) sy *= s;
+				}
 			}
 		}
 		bone.updateWorldTransform(bone.ax, bone.ay, bone.arotation + rotationIK * alpha, sx, sy, bone.ashearX, bone.ashearY);