[unity] Fixed SkeletonGraphic not updating the canvas renderer texture after skin changes (e.g. when calling `GetRepackedSkin`). Closes #1459.

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs

@@ -59,6 +59,8 @@ namespace Spine.Unity {
 		public bool freeze;
 		public bool unscaledTime;
 
+		private Texture baseTexture = null;
+
 		#if UNITY_EDITOR
 		protected override void OnValidate () {
 			// This handles Scene View preview.
@@ -152,9 +154,8 @@ namespace Spine.Unity {
 		}
 		public override Texture mainTexture {
 			get { 
-				// Fail loudly when incorrectly set up.
 				if (overrideTexture != null) return overrideTexture;
-				return skeletonDataAsset == null ? null : skeletonDataAsset.atlasAssets[0].PrimaryMaterial.mainTexture;
+				return baseTexture;
 			}
 		}
 
@@ -272,6 +273,7 @@ namespace Spine.Unity {
 			};
 
 			meshBuffers = new DoubleBuffered<MeshRendererBuffers.SmartMesh>();
+			baseTexture = skeletonDataAsset.atlasAssets[0].PrimaryMaterial.mainTexture;
 			canvasRenderer.SetTexture(this.mainTexture); // Needed for overwriting initializations.
 
 			// Set the initial Skin and Animation
@@ -296,8 +298,7 @@ namespace Spine.Unity {
 			skeleton.SetColor(this.color);
 			var smartMesh = meshBuffers.GetNext();
 			var currentInstructions = this.currentInstructions;
-
-			MeshGenerator.GenerateSingleSubmeshInstruction(currentInstructions, skeleton, this.material);
+			MeshGenerator.GenerateSingleSubmeshInstruction(currentInstructions, skeleton, null);
 			bool updateTriangles = SkeletonRendererInstruction.GeometryNotEqual(currentInstructions, smartMesh.instructionUsed);
 
 			meshGenerator.Begin();
@@ -317,6 +318,15 @@ namespace Spine.Unity {
 
 			canvasRenderer.SetMesh(mesh);
 			smartMesh.instructionUsed.Set(currentInstructions);
+			
+			if (currentInstructions.submeshInstructions.Count > 0) {
+				var material = currentInstructions.submeshInstructions.Items[0].material;
+				if (material != null && baseTexture != material.mainTexture) {
+					baseTexture = material.mainTexture;
+					if (overrideTexture == null)
+						canvasRenderer.SetTexture(this.mainTexture);
+				}
+			}
 
 			//this.UpdateMaterial(); // TODO: This allocates memory.
 		}

spine-unity/Assets/Spine/Runtime/spine-unity/Mesh Generation/MeshGenerator.cs

@@ -133,6 +133,14 @@ namespace Spine.Unity {
 		}
 
 		#region Step 1 : Generate Instructions
+		/// <summary>
+		/// A specialized variant of <see cref="GenerateSkeletonRendererInstruction"/>.
+		/// Generates renderer instructions using a single submesh, using only a single material and texture.
+		/// </summary>
+		/// <param name="instructionOutput">The resulting instructions.</param>
+		/// <param name="skeleton">The skeleton to generate renderer instructions for.</param>
+		/// <param name="material">Material to be set at the renderer instruction. When null, the last attachment
+		/// in the draw order list is assigned as the instruction's material.</param>
 		public static void GenerateSingleSubmeshInstruction (SkeletonRendererInstruction instructionOutput, Skeleton skeleton, Material material) {
 			ExposedList<Slot> drawOrder = skeleton.drawOrder;
 			int drawOrderCount = drawOrder.Count;
@@ -161,6 +169,7 @@ namespace Spine.Unity {
 			};
 
 			#if SPINE_TRIANGLECHECK
+			object rendererObject = null;
 			bool skeletonHasClipping = false;
 			var drawOrderItems = drawOrder.Items;
 			for (int i = 0; i < drawOrderCount; i++) {
@@ -174,11 +183,13 @@ namespace Spine.Unity {
 
 				var regionAttachment = attachment as RegionAttachment;
 				if (regionAttachment != null) {
+					rendererObject = regionAttachment.RendererObject;
 					attachmentVertexCount = 4;
 					attachmentTriangleCount = 6;
 				} else {
 					var meshAttachment = attachment as MeshAttachment;
 					if (meshAttachment != null) {
+						rendererObject = meshAttachment.RendererObject;
 						attachmentVertexCount = meshAttachment.worldVerticesLength >> 1;
 						attachmentTriangleCount = meshAttachment.triangles.Length;
 					} else {
@@ -194,8 +205,14 @@ namespace Spine.Unity {
 				current.rawTriangleCount += attachmentTriangleCount;
 				current.rawVertexCount += attachmentVertexCount;
 				totalRawVertexCount += attachmentVertexCount;
-
 			}
+		#if !SPINE_TK2D
+			if (material == null)
+				current.material = (Material)((AtlasRegion)rendererObject).page.rendererObject;
+		#else
+			if (material == null)
+				current.material = (rendererObject is Material) ? (Material)rendererObject : (Material)((AtlasRegion)rendererObject).page.rendererObject;
+		#endif
 
 			instructionOutput.hasActiveClipping = skeletonHasClipping;
 			instructionOutput.rawVertexCount = totalRawVertexCount;