Improve NPC loading performance by caching the cleaned objectRoot

apps/openmw/mwrender/animation.cpp

@@ -1123,6 +1123,32 @@ namespace MWRender
             state->second.mLoopingEnabled = enabled;
     }
 
+    osg::ref_ptr<osg::Node> getModelInstance(Resource::SceneManager* sceneMgr, const std::string& model, bool baseonly)
+    {
+        if (baseonly)
+        {
+            typedef std::map<std::string, osg::ref_ptr<osg::Node> > Cache;
+            static Cache cache;
+            Cache::iterator found = cache.find(model);
+            if (found == cache.end())
+            {
+                osg::ref_ptr<osg::Node> created = sceneMgr->getInstance(model);
+
+                RemoveDrawableVisitor removeDrawableVisitor;
+                created->accept(removeDrawableVisitor);
+                removeDrawableVisitor.remove();
+
+                cache.insert(std::make_pair(model, created));
+
+                return sceneMgr->createInstance(created);
+            }
+            else
+                return sceneMgr->createInstance(found->second);
+        }
+        else
+            return sceneMgr->createInstance(model);
+    }
+
     void Animation::setObjectRoot(const std::string &model, bool forceskeleton, bool baseonly, bool isCreature)
     {
         osg::ref_ptr<osg::StateSet> previousStateset;
@@ -1144,7 +1170,8 @@ namespace MWRender
 
         if (!forceskeleton)
         {
-            osg::ref_ptr<osg::Node> created = mResourceSystem->getSceneManager()->getInstance(model, mInsert);
+            osg::ref_ptr<osg::Node> created = getModelInstance(mResourceSystem->getSceneManager(), model, baseonly);
+            mInsert->addChild(created);
             mObjectRoot = created->asGroup();
             if (!mObjectRoot)
             {
@@ -1156,7 +1183,7 @@ namespace MWRender
         }
         else
         {
-            osg::ref_ptr<osg::Node> created = mResourceSystem->getSceneManager()->getInstance(model);
+            osg::ref_ptr<osg::Node> created = getModelInstance(mResourceSystem->getSceneManager(), model, baseonly);
             osg::ref_ptr<SceneUtil::Skeleton> skel = dynamic_cast<SceneUtil::Skeleton*>(created.get());
             if (!skel)
             {
@@ -1171,13 +1198,6 @@ namespace MWRender
         if (previousStateset)
             mObjectRoot->setStateSet(previousStateset);
 
-        if (baseonly)
-        {
-            RemoveDrawableVisitor removeDrawableVisitor;
-            mObjectRoot->accept(removeDrawableVisitor);
-            removeDrawableVisitor.remove();
-        }
-
         if (isCreature)
         {
             RemoveTriBipVisitor removeTriBipVisitor;

components/resource/scenemanager.cpp

@@ -538,10 +538,15 @@ namespace Resource
     osg::ref_ptr<osg::Node> SceneManager::createInstance(const std::string& name)
     {
         osg::ref_ptr<const osg::Node> scene = getTemplate(name);
-        osg::ref_ptr<osg::Node> cloned = osg::clone(scene.get(), SceneUtil::CopyOp());
+        return createInstance(scene);
+    }
+
+    osg::ref_ptr<osg::Node> SceneManager::createInstance(const osg::Node *base)
+    {
+        osg::ref_ptr<osg::Node> cloned = osg::clone(base, SceneUtil::CopyOp());
 
         // add a ref to the original template, to hint to the cache that it's still being used and should be kept in cache
-        cloned->getOrCreateUserDataContainer()->addUserObject(new TemplateRef(scene));
+        cloned->getOrCreateUserDataContainer()->addUserObject(new TemplateRef(base));
 
         // we can skip any scene graphs without update callbacks since we know that particle emitters will have an update callback set
         if (cloned->getNumChildrenRequiringUpdateTraversal() > 0)

components/resource/scenemanager.hpp

@@ -93,6 +93,10 @@ namespace Resource
         /// @note Thread safe.
         osg::ref_ptr<osg::Node> cacheInstance(const std::string& name);
 
+        osg::ref_ptr<osg::Node> createInstance(const std::string& name);
+
+        osg::ref_ptr<osg::Node> createInstance(const osg::Node* base);
+
         /// Get an instance of the given scene template
         /// @see getTemplate
         /// @note Thread safe.
@@ -141,8 +145,6 @@ namespace Resource
 
     private:
 
-        osg::ref_ptr<osg::Node> createInstance(const std::string& name);
-
         std::auto_ptr<Shader::ShaderManager> mShaderManager;
         bool mForceShaders;
         bool mClampLighting;