Render only cached recast mesh

To avoid waiting while recast mesh is generating.

Remove redundant continue.

apps/openmw/mwrender/recastmesh.cpp

@@ -60,7 +60,6 @@ namespace MWRender
                 it->second.mValue = group;
                 it->second.mGeneration = tile->second->getGeneration();
                 it->second.mRevision = tile->second->getRevision();
-                continue;
             }
 
             ++it;

components/detournavigator/cachedrecastmeshmanager.cpp

@@ -13,7 +13,7 @@ namespace DetourNavigator
     {
         if (!mImpl.addObject(id, shape, transform, areaType))
             return false;
-        mCached.lock()->reset();
+        mOutdatedCache = true;
         return true;
     }
 
@@ -21,7 +21,7 @@ namespace DetourNavigator
     {
         if (!mImpl.updateObject(id, transform, areaType))
             return false;
-        mCached.lock()->reset();
+        mOutdatedCache = true;
         return true;
     }
 
@@ -29,7 +29,7 @@ namespace DetourNavigator
     {
         auto object = mImpl.removeObject(id);
         if (object)
-            mCached.lock()->reset();
+            mOutdatedCache = true;
         return object;
     }
 
@@ -38,7 +38,7 @@ namespace DetourNavigator
     {
         if (!mImpl.addWater(cellPosition, cellSize, shift))
             return false;
-        mCached.lock()->reset();
+        mOutdatedCache = true;
         return true;
     }
 
@@ -46,7 +46,7 @@ namespace DetourNavigator
     {
         const auto water = mImpl.removeWater(cellPosition);
         if (water)
-            mCached.lock()->reset();
+            mOutdatedCache = true;
         return water;
     }
 
@@ -55,7 +55,7 @@ namespace DetourNavigator
     {
         if (!mImpl.addHeightfield(cellPosition, cellSize, shift, shape))
             return false;
-        mCached.lock()->reset();
+        mOutdatedCache = true;
         return true;
     }
 
@@ -63,18 +63,27 @@ namespace DetourNavigator
     {
         const auto cell = mImpl.removeHeightfield(cellPosition);
         if (cell)
-            mCached.lock()->reset();
+            mOutdatedCache = true;
         return cell;
     }
 
     std::shared_ptr<RecastMesh> CachedRecastMeshManager::getMesh()
     {
-        std::shared_ptr<RecastMesh> cached = *mCached.lock();
-        if (cached != nullptr)
-            return cached;
-        cached = mImpl.getMesh();
-        *mCached.lock() = cached;
-        return cached;
+        bool outdated = true;
+        if (!mOutdatedCache.compare_exchange_strong(outdated, false))
+        {
+            std::shared_ptr<RecastMesh> cached = getCachedMesh();
+            if (cached != nullptr)
+                return cached;
+        }
+        std::shared_ptr<RecastMesh> mesh = mImpl.getMesh();
+        *mCached.lock() = mesh;
+        return mesh;
+    }
+
+    std::shared_ptr<RecastMesh> CachedRecastMeshManager::getCachedMesh() const
+    {
+        return *mCached.lockConst();
     }
 
     bool CachedRecastMeshManager::isEmpty() const

components/detournavigator/cachedrecastmeshmanager.hpp

@@ -7,6 +7,8 @@
 
 #include <components/misc/guarded.hpp>
 
+#include <atomic>
+
 namespace DetourNavigator
 {
     class CachedRecastMeshManager
@@ -32,6 +34,8 @@ namespace DetourNavigator
 
         std::shared_ptr<RecastMesh> getMesh();
 
+        std::shared_ptr<RecastMesh> getCachedMesh() const;
+
         bool isEmpty() const;
 
         void reportNavMeshChange(const Version& recastMeshVersion, const Version& navMeshVersion);
@@ -41,6 +45,7 @@ namespace DetourNavigator
     private:
         RecastMeshManager mImpl;
         Misc::ScopeGuarded<std::shared_ptr<RecastMesh>> mCached;
+        std::atomic_bool mOutdatedCache {true};
     };
 }
 

components/detournavigator/navigator.hpp

@@ -236,7 +236,7 @@ namespace DetourNavigator
         std::optional<osg::Vec3f> raycast(const osg::Vec3f& agentHalfExtents, const osg::Vec3f& start,
             const osg::Vec3f& end, const Flags includeFlags) const;
 
-        virtual RecastMeshTiles getRecastMeshTiles() = 0;
+        virtual RecastMeshTiles getRecastMeshTiles() const = 0;
 
         virtual float getMaxNavmeshAreaRealRadius() const = 0;
     };

components/detournavigator/navigatorimpl.cpp

@@ -187,7 +187,7 @@ namespace DetourNavigator
         mNavMeshManager.reportStats(frameNumber, stats);
     }
 
-    RecastMeshTiles NavigatorImpl::getRecastMeshTiles()
+    RecastMeshTiles NavigatorImpl::getRecastMeshTiles() const
     {
         return mNavMeshManager.getRecastMeshTiles();
     }

components/detournavigator/navigatorimpl.hpp

@@ -60,7 +60,7 @@ namespace DetourNavigator
 
         void reportStats(unsigned int frameNumber, osg::Stats& stats) const override;
 
-        RecastMeshTiles getRecastMeshTiles() override;
+        RecastMeshTiles getRecastMeshTiles() const override;
 
         float getMaxNavmeshAreaRealRadius() const override;
 

components/detournavigator/navigatorstub.hpp

@@ -94,7 +94,7 @@ namespace DetourNavigator
 
         void reportStats(unsigned int /*frameNumber*/, osg::Stats& /*stats*/) const override {}
 
-        RecastMeshTiles getRecastMeshTiles() override
+        RecastMeshTiles getRecastMeshTiles() const override
         {
             return {};
         }

components/detournavigator/navmeshmanager.cpp

@@ -232,14 +232,15 @@ namespace DetourNavigator
         mAsyncNavMeshUpdater.reportStats(frameNumber, stats);
     }
 
-    RecastMeshTiles NavMeshManager::getRecastMeshTiles()
+    RecastMeshTiles NavMeshManager::getRecastMeshTiles() const
     {
         std::vector<TilePosition> tiles;
         mRecastMeshManager.forEachTile(
             [&tiles] (const TilePosition& tile, const CachedRecastMeshManager&) { tiles.push_back(tile); });
         RecastMeshTiles result;
-        std::transform(tiles.begin(), tiles.end(), std::inserter(result, result.end()),
-            [this] (const TilePosition& tile) { return std::make_pair(tile, mRecastMeshManager.getMesh(tile)); });
+        for (const TilePosition& tile : tiles)
+            if (auto mesh = mRecastMeshManager.getCachedMesh(tile))
+                result.emplace(tile, std::move(mesh));
         return result;
     }
 

components/detournavigator/navmeshmanager.hpp

@@ -59,7 +59,7 @@ namespace DetourNavigator
 
         void reportStats(unsigned int frameNumber, osg::Stats& stats) const;
 
-        RecastMeshTiles getRecastMeshTiles();
+        RecastMeshTiles getRecastMeshTiles() const;
 
     private:
         const Settings& mSettings;

components/detournavigator/tilecachedrecastmeshmanager.cpp

@@ -192,17 +192,16 @@ namespace DetourNavigator
 
     std::shared_ptr<RecastMesh> TileCachedRecastMeshManager::getMesh(const TilePosition& tilePosition) const
     {
-        const auto manager = [&] () -> std::shared_ptr<CachedRecastMeshManager>
-        {
-            const auto tiles = mTiles.lockConst();
-            const auto it = tiles->find(tilePosition);
-            if (it == tiles->end())
-                return nullptr;
-            return it->second;
-        } ();
-        if (manager == nullptr)
-            return nullptr;
-        return manager->getMesh();
+        if (const auto manager = getManager(tilePosition))
+            return manager->getMesh();
+        return nullptr;
+    }
+
+    std::shared_ptr<RecastMesh> TileCachedRecastMeshManager::getCachedMesh(const TilePosition& tilePosition) const
+    {
+        if (const auto manager = getManager(tilePosition))
+            return manager->getCachedMesh();
+        return nullptr;
     }
 
     std::size_t TileCachedRecastMeshManager::getRevision() const
@@ -256,4 +255,13 @@ namespace DetourNavigator
         }
         return tileResult;
     }
+
+    std::shared_ptr<CachedRecastMeshManager> TileCachedRecastMeshManager::getManager(const TilePosition& tilePosition) const
+    {
+        const auto tiles = mTiles.lockConst();
+        const auto it = tiles->find(tilePosition);
+        if (it == tiles->end())
+            return nullptr;
+        return it->second;
+    }
 }

components/detournavigator/tilecachedrecastmeshmanager.hpp

@@ -88,6 +88,8 @@ namespace DetourNavigator
 
         std::shared_ptr<RecastMesh> getMesh(const TilePosition& tilePosition) const;
 
+        std::shared_ptr<RecastMesh> getCachedMesh(const TilePosition& tilePosition) const;
+
         template <class Function>
         void forEachTile(Function&& function) const
         {
@@ -118,6 +120,8 @@ namespace DetourNavigator
 
         std::optional<RemovedRecastMeshObject> removeTile(const ObjectId id, const TilePosition& tilePosition,
                 TilesMap& tiles);
+
+        inline std::shared_ptr<CachedRecastMeshManager> getManager(const TilePosition& tilePosition) const;
     };
 }