Adding the concept of selection to the scene

libraries/render/src/render/Scene.cpp

@@ -18,8 +18,8 @@ using namespace render;
 
 void Transaction::resetItem(ItemID id, const PayloadPointer& payload) {
     if (payload) {
-        _resetItems.push_back(id);
-        _resetPayloads.push_back(payload);
+        _resetItems.emplace_back(id);
+        _resetPayloads.emplace_back(payload);
     } else {
         qCDebug(renderlogging) << "WARNING: Transaction::resetItem with a null payload!";
         removeItem(id);
@@ -27,12 +27,16 @@ void Transaction::resetItem(ItemID id, const PayloadPointer& payload) {
 }
 
 void Transaction::removeItem(ItemID id) {
-    _removedItems.push_back(id);
+    _removedItems.emplace_back(id);
 }
 
 void Transaction::updateItem(ItemID id, const UpdateFunctorPointer& functor) {
-    _updatedItems.push_back(id);
-    _updateFunctors.push_back(functor);
+    _updatedItems.emplace_back(id);
+    _updateFunctors.emplace_back(functor);
+}
+
+void Transaction::resetSelection(const Selection& selection) {
+    _resetSelections.emplace_back(selection);
 }
 
 void Transaction::merge(const Transaction& transaction) {
@@ -41,8 +45,10 @@ void Transaction::merge(const Transaction& transaction) {
     _removedItems.insert(_removedItems.end(), transaction._removedItems.begin(), transaction._removedItems.end());
     _updatedItems.insert(_updatedItems.end(), transaction._updatedItems.begin(), transaction._updatedItems.end());
     _updateFunctors.insert(_updateFunctors.end(), transaction._updateFunctors.begin(), transaction._updateFunctors.end());
+    _resetSelections.insert(_resetSelections.end(), transaction._resetSelections.begin(), transaction._resetSelections.end());
 }
 
+
 Scene::Scene(glm::vec3 origin, float size) :
     _masterSpatialTree(origin, size)
 {
@@ -112,6 +118,13 @@ void Scene::processTransactionQueue() {
         // Update the numItemsAtomic counter AFTER the pending changes went through
         _numAllocatedItems.exchange(maxID);
     }
+
+    if (consolidatedTransaction.touchTransactions()) {
+        std::unique_lock<std::mutex> lock(_selectionsMutex);
+
+        // resets and potential NEW items
+        resetSelections(consolidatedTransaction._resetSelections);
+    }
 }
 
 void Scene::resetItems(const ItemIDs& ids, Payloads& payloads) {
@@ -202,3 +215,25 @@ void Scene::updateItems(const ItemIDs& ids, UpdateFunctors& functors) {
         updateFunctor++;
     }
 }
+
+// THis fucntion is thread safe
+Selection Scene::getSelection(const Selection::Name& name) const {
+    std::unique_lock<std::mutex> lock(_selectionsMutex);
+    auto found = _selections.find(name);
+    if (found == _selections.end()) {
+        return Selection();
+    } else {
+        return (*found).second;
+    }
+}
+
+void Scene::resetSelections(const Selections& selections) {
+    for (auto selection : selections) {
+        auto found = _selections.find(selection.getName());
+        if (found == _selections.end()) {
+            _selections.insert(SelectionMap::value_type(selection.getName(), selection));
+        } else {
+            (*found).second = selection;
+        }
+    }
+}

libraries/render/src/render/Scene.h

@@ -34,6 +34,7 @@ public:
     Transaction() {}
     ~Transaction() {}
 
+    // Item transactions
     void resetItem(ItemID id, const PayloadPointer& payload);
     void removeItem(ItemID id);
 
@@ -44,14 +45,22 @@ public:
     void updateItem(ItemID id, const UpdateFunctorPointer& functor);
     void updateItem(ItemID id) { updateItem(id, nullptr); }
 
+    // Selection transactions
+    void resetSelection(const Selection& selection);
+
     void merge(const Transaction& transaction);
 
+    // Checkers if there is work to do when processing the transaction
+    bool touchTransactions() const { return !_resetSelections.empty(); }
+
     ItemIDs _resetItems; 
     Payloads _resetPayloads;
     ItemIDs _removedItems;
     ItemIDs _updatedItems;
     UpdateFunctors _updateFunctors;
 
+    Selections _resetSelections;
+
 protected:
 };
 typedef std::queue<Transaction> TransactionQueue;
@@ -82,6 +91,10 @@ public:
     // Process the pending transactions queued
     void processTransactionQueue();
 
+    // Access a particular selection (empty if doesn't exist)
+    // Thread safe
+    Selection getSelection(const Selection::Name& name) const;
+
     // This next call are  NOT threadsafe, you have to call them from the correct thread to avoid any potential issues
 
     // Access a particular item form its ID
@@ -117,9 +130,15 @@ protected:
 
 
     // The Selection map
-    std::mutex _selectionsMutex;
+    mutable std::mutex _selectionsMutex; // mutable so it can be used in the thread safe getSelection const method
     SelectionMap _selections;
 
+    void resetSelections(const Selections& selections);
+  // More actions coming to selections soon:
+  //  void removeFromSelection(const Selection& selection);
+  //  void appendToSelection(const Selection& selection);
+  //  void mergeWithSelection(const Selection& selection);
+
     friend class Engine;
 };
 

libraries/render/src/render/Selection.cpp

@@ -14,11 +14,42 @@
 
 using namespace render;
 
-Selection::Selection(const std::string& name, const ItemIDs items) :
+
+Selection::Selection() :
+_name(),
+_items()
+{
+}
+
+Selection::Selection(const Selection& selection) :
+_name(selection._name),
+_items(selection._items)
+{
+}
+
+Selection& Selection::operator= (const Selection& selection) {
+    _name = (selection._name);
+    _items = (selection._items);
+    return (*this);
+}
+
+Selection::Selection(Selection&& selection) :
+_name(selection._name),
+_items(selection._items)
+{
+}
+
+
+Selection& Selection::operator= (Selection&& selection) {
+    _name = (selection._name);
+    _items = (selection._items);
+    return (*this);
+}
+
+Selection::Selection(const Name& name, const ItemIDs& items) :
     _name(name),
     _items(items)
 {
-
 }
 
 Selection::~Selection() {

libraries/render/src/render/Selection.h

@@ -18,21 +18,28 @@ namespace render {
 
     class Selection {
     public:
+        using Name = std::string;
 
-        Selection(const std::string& name, const ItemIDs items);
         ~Selection();
+        Selection();
+        Selection(const Selection& selection);
+        Selection& operator= (const Selection& selection);
+        Selection(Selection&& selection);
+        Selection& operator= (Selection&& selection);
 
-        const std::string& getName() const { return _name; }
+        Selection(const Name& name, const ItemIDs& items);
+
+        const Name& getName() const { return _name; }
 
         const ItemIDs& getItems() const { return _items; }
 
     protected:
-        const std::string _name;
+        Name _name;
         ItemIDs _items;
     };
     using Selections = std::vector<Selection>;
 
-    using SelectionMap = std::map<std::string, Selection>;
+    using SelectionMap = std::map<const Selection::Name, Selection>;
 
 }