[unity] Added OnMeshAndMaterialsUpdated callback for SkeletonRenderSeparator and SkeletonPartsRenderer. Closes #1752.

CHANGELOG.md

@@ -237,6 +237,7 @@
   * Added support for double-sided lighting at all `SkeletonLit` shaders (including URP and LWRP packages).
   * Added frustum culling update mode parameters `Update When Invisible` (Inspector parameter) and `UpdateMode` (available via code) to all Skeleton components. This provides a simple way to disable certain updates when the `Renderer` is no longer visible (outside all cameras, culled in frustum culling). The new `UpdateMode` property allows disabling updates at a finer granularity level than disabling the whole component. Available modes are: `Nothing`, `OnlyAnimationStatus`, `EverythingExceptMesh` and `FullUpdate`.
   * Added a new `Spine/Outline/OutlineOnly-ZWrite` shader to provide correct outline-only rendering. Note: the shader requires two render passes and is therefore not compatible with URP. The `Spine Examples/Other Examples/Outline Shaders` example scene has been updated to demonstrate the new shader.
+  * Added `OnMeshAndMaterialsUpdated` callback event to `SkeletonRenderSeparator` and `SkeletonPartsRenderer`. It is issued at the end of `LateUpdate`, before rendering.
 
 * **Changes of default values**
   * `SkeletonMecanim`'s `Layer Mix Mode` now defaults to `MixMode.MixNext` instead of `MixMode.MixAlways`.

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderSeparator/SkeletonPartsRenderer.cs

@@ -60,6 +60,14 @@ namespace Spine.Unity {
 		}
 		#endregion
 
+		#region Callback Delegates
+		public delegate void SkeletonPartsRendererDelegate (SkeletonPartsRenderer skeletonPartsRenderer);
+
+		/// <summary>OnMeshAndMaterialsUpdated is called at the end of LateUpdate after the Mesh and
+		/// all materials have been updated.</summary>
+		public event SkeletonPartsRendererDelegate OnMeshAndMaterialsUpdated;
+		#endregion
+
 		MeshRendererBuffers buffers;
 		SkeletonRendererInstruction currentInstructions = new SkeletonRendererInstruction();
 
@@ -121,6 +129,9 @@ namespace Spine.Unity {
 
 			meshFilter.sharedMesh = mesh;
 			smartMesh.instructionUsed.Set(currentInstructions);
+
+			if (OnMeshAndMaterialsUpdated != null)
+				OnMeshAndMaterialsUpdated(this);
 		}
 
 		public void SetPropertyBlock (MaterialPropertyBlock block) {

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

@@ -77,6 +77,12 @@ namespace Spine.Unity {
 		#endif
 		#endregion
 
+		#region Callback Delegates
+		/// <summary>OnMeshAndMaterialsUpdated is called at the end of LateUpdate after the Mesh and
+		/// all materials have been updated.</summary>
+		public event SkeletonRenderer.SkeletonRendererDelegate OnMeshAndMaterialsUpdated;
+		#endregion
+
 		#region Runtime Instantiation
 		/// <summary>Adds a SkeletonRenderSeparator and child SkeletonPartsRenderer GameObjects to a given SkeletonRenderer.</summary>
 		/// <returns>The to skeleton renderer.</returns>
@@ -247,6 +253,9 @@ namespace Spine.Unity {
 				}
 			}
 
+			if (OnMeshAndMaterialsUpdated != null)
+				OnMeshAndMaterialsUpdated(this.skeletonRenderer);
+
 			// Clear extra renderers if they exist.
 			for (; rendererIndex < rendererCount; rendererIndex++) {
 				currentRenderer = partsRenderers[rendererIndex];

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

@@ -236,7 +236,7 @@ namespace Spine.Unity {
 		/// <summary>OnRebuild is raised after the Skeleton is successfully initialized.</summary>
 		public event SkeletonRendererDelegate OnRebuild;
 
-		/// <summary>OnMeshAndMaterialsUpdated is at the end of LateUpdate after the Mesh and
+		/// <summary>OnMeshAndMaterialsUpdated is called at the end of LateUpdate after the Mesh and
 		/// all materials have been updated.</summary>
 		public event SkeletonRendererDelegate OnMeshAndMaterialsUpdated;