From 156ef80a9cfa4752ed0c00ca37163edd9590c91d Mon Sep 17 00:00:00 2001
From: Harald Csaszar <harald.csaszar@pixelcloudgames.com>
Date: Fri, 8 Apr 2022 11:16:42 +0200
Subject: [PATCH] [unity] Setting SkeletonGraphic
 CanvasRenderer.cullTransparentMesh to false at new instances to avoid `Add`
 blend mode problems.

---
 .../Editor/Components/SkeletonGraphicInspector.cs  |  9 +++++++++
 .../spine-unity/Components/SkeletonGraphic.cs      | 14 +++++++++-----
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
index a14c6a711..e3f439147 100644
--- a/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
+++ b/spine-unity/Assets/Spine/Editor/spine-unity/Editor/Components/SkeletonGraphicInspector.cs
@@ -31,6 +31,10 @@
 #define NEW_PREFAB_SYSTEM
 #endif
 
+#if UNITY_2018_2_OR_NEWER
+#define HAS_CULL_TRANSPARENT_MESH
+#endif
+
 using UnityEditor;
 using UnityEngine;
 
@@ -469,6 +473,11 @@ namespace Spine.Unity.Editor {
 			graphic.additiveMaterial = SkeletonGraphicInspector.DefaultSkeletonGraphicAdditiveMaterial;
 			graphic.multiplyMaterial = SkeletonGraphicInspector.DefaultSkeletonGraphicMultiplyMaterial;
 			graphic.screenMaterial = SkeletonGraphicInspector.DefaultSkeletonGraphicScreenMaterial;
+
+#if HAS_CULL_TRANSPARENT_MESH
+			var canvasRenderer = go.GetComponent<CanvasRenderer>();
+			canvasRenderer.cullTransparentMesh = false;
+#endif
 			return go;
 		}
 
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
index df0134b98..efc4d95e4 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
@@ -169,13 +169,17 @@ namespace Spine.Unity {
 		/// <summary>Add a SkeletonGraphic component to a GameObject.</summary>
 		/// <param name="material">Material for the canvas renderer to use. Usually, the default SkeletonGraphic material will work.</param>
 		public static SkeletonGraphic AddSkeletonGraphicComponent (GameObject gameObject, SkeletonDataAsset skeletonDataAsset, Material material) {
-			var c = gameObject.AddComponent<SkeletonGraphic>();
+			var skeletonGraphic = gameObject.AddComponent<SkeletonGraphic>();
 			if (skeletonDataAsset != null) {
-				c.material = material;
-				c.skeletonDataAsset = skeletonDataAsset;
-				c.Initialize(false);
+				skeletonGraphic.material = material;
+				skeletonGraphic.skeletonDataAsset = skeletonDataAsset;
+				skeletonGraphic.Initialize(false);
 			}
-			return c;
+#if HAS_CULL_TRANSPARENT_MESH
+			var canvasRenderer = gameObject.GetComponent<CanvasRenderer>();
+			if (canvasRenderer) canvasRenderer.cullTransparentMesh = false;
+#endif
+			return skeletonGraphic;
 		}
 		#endregion