chore: cleanup source code comments and finalize stability fixes

Author: Eatgrapes

binding/src/main/java/dev/eatgrapes/live2d/CubismUserModel.java

@@ -43,15 +43,15 @@ public void startMotion(byte[] buffer, int priority, boolean loop, Consumer<Stri
     }
     private static native void startMotionNative(long ptr, byte[] buffer, int priority, boolean loop);
 
+    public boolean isMotionFinished() { return isMotionFinishedNative(_ptr); }
+    private static native boolean isMotionFinishedNative(long ptr);
+
     private void onMotionFinished(String name) {
         if (motionFinishedCallback != null) {
             motionFinishedCallback.accept(name);
         }
     }
 
-    public boolean isMotionFinished() { return isMotionFinishedNative(_ptr); }
-    private static native boolean isMotionFinishedNative(long ptr);
-
     public void update(float deltaTime) { updateNative(_ptr, deltaTime); }
     private static native void updateNative(long ptr, float deltaTime);
 
@@ -73,4 +73,4 @@ private void onMotionFinished(String name) {
     @Override
     public void close() { deleteNative(_ptr); }
     private static native void deleteNative(long ptr);
-}
+}

native/src/CubismUserModel_JNI.cpp

@@ -31,6 +31,7 @@ class JniUserModel : public CubismUserModel {
     void loadModelCopy(const csmByte* buffer, csmSizeInt size) {
         _mocBuffer.assign(buffer, buffer + size);
         LoadModel(_mocBuffer.data(), (csmSizeInt)_mocBuffer.size());
+        if (_model) _model->SaveParameters();
     }
 
     void loadPhysicsCopy(const csmByte* buffer, csmSizeInt size) {
@@ -70,7 +71,6 @@ class JniUserModel : public CubismUserModel {
     void update(float dt) {
         if (!_model) return;
 
-        // Cleanup finished motions safely
         {
             std::lock_guard<std::mutex> lock(_pendingMutex);
             for (auto* m : _pendingDeletion) {
@@ -84,13 +84,7 @@ class JniUserModel : public CubismUserModel {
         }
 
         _model->LoadParameters();
-        
-        // Update motion and check if we are idle
-        bool isMotionPlaying = !_motionManager->IsFinished();
-        if (isMotionPlaying) {
-            _motionManager->UpdateMotion(_model, dt);
-        }
-        
+        _motionManager->UpdateMotion(_model, dt);
         _model->SaveParameters();
 
         if (_pose) _pose->UpdateParameters(_model, dt);
@@ -108,9 +102,7 @@ class JniUserModel : public CubismUserModel {
         _model->Update();
     }
 
-    bool isMotionFinished() {
-        return _motionManager->IsFinished();
-    }
+    bool isMotionFinished() { return _motionManager->IsFinished(); }
 
     void notifyFinished() {
         JNIEnv* env = getEnv();