[c] Added void* userData to spAnimationState to be consumed in callba…

…cks. Closes

#1017.

CHANGELOG.md

@@ -52,6 +52,7 @@
   * Added `spVertexEffect` and corresponding implementations `spJitterVertexEffect` and `spSwirlVertexEffect`. Create/dispose through the corresponding `spXXXVertexEffect_create()/dispose()` functions. Set on framework/engine specific renderer. See changes for spine-c based frameworks/engines below.
   * Functions in `extension.h` are not prefixed with `_sp` instead of just `_` to avoid interference with other libraries.
   * Introduced `SP_API` macro. Every spine-c function is prefixed with this macro. By default, it is an empty string. Can be used to markup spine-c functions with e.g. ``__declspec` when compiling to a dll or linking to that dll.
+  * Added `void* userData` to `spAnimationState` to be consumed in callbacks.
 
 ### Cocos2d-X
  * Fixed renderer to work with 3.6 changes

spine-c/spine-c/include/spine/AnimationState.h

@@ -84,7 +84,8 @@ struct spTrackEntry {
 		timelineData(0),
 		timelineDipMix(0),
 		timelinesRotation(0),
-		timelinesRotationCount(0) {
+		timelinesRotationCount(0),
+		rendererObject(0), userData(0) {
 	}
 #endif
 };
@@ -102,6 +103,7 @@ struct spAnimationState {
 	spTrackEntryArray* mixingTo;
 
 	void* rendererObject;
+	void* userData;
 
 #ifdef __cplusplus
 	spAnimationState() :
@@ -111,7 +113,8 @@ struct spAnimationState {
 		listener(0),
 		timeScale(0),
 		mixingTo(0),
-		rendererObject(0) {
+		rendererObject(0),
+		userData(0) {
 	}
 #endif
 };