Do direct notification of backend nodeswip/refactor

Since aspect manager is now on main thread, we can directly update
backend nodes safely. Track nodes which have changed properties and
notify the backend nodes as part of the frame loop.
This avoid allocating and delivering many change messages.

To follow:
- implement on all nodes
- look at backend to frontend syncing
- figure out what to do with non property messages (components
  added/removed, commands, ...)

Change-Id: Ia0c442b0528e728c4324d168200bae021bc29266
Reviewed-by: Mike Krus <mike.krus@kdab.com>
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/src/core/qchangearbiter_p.h b/src/core/qchangearbiter_p.h
index c7d96b593..48fc4ca8c 100644
--- a/src/core/qchangearbiter_p.h
+++ b/src/core/qchangearbiter_p.h
@@ -81,6 +81,8 @@ class Q_3DCORE_PRIVATE_EXPORT QAbstractArbiter : public QLockableObserverInterfa
 {
 public:
     virtual QAbstractPostman *postman() const = 0;
+    virtual void addDirtyFrontEndNode(QNode *node) = 0;
+    virtual void removeDirtyFrontEndNode(QNode *node) = 0;
 };
 
 class Q_3DCORE_PRIVATE_EXPORT QChangeArbiter final
@@ -89,7 +91,7 @@ class Q_3DCORE_PRIVATE_EXPORT QChangeArbiter final
 {
     Q_OBJECT
 public:
-    explicit QChangeArbiter(QObject *parent = 0);
+    explicit QChangeArbiter(QObject *parent = nullptr);
     ~QChangeArbiter();
 
     void initialize(Qt3DCore::QAbstractAspectJobManager *jobManager);
@@ -109,6 +111,10 @@ public:
     void sceneChangeEventWithLock(const QSceneChangePtr &e) override; // QLockableObserverInterface impl
     void sceneChangeEventWithLock(const QSceneChangeList &e) override; // QLockableObserverInterface impl
 
+    void addDirtyFrontEndNode(QNode *node) override;
+    void removeDirtyFrontEndNode(QNode *node) override;
+    QVector<QNode *> takeDirtyFrontEndNodes();
+
     void setPostman(Qt3DCore::QAbstractPostman *postman);
     void setScene(Qt3DCore::QScene *scene);
 
@@ -155,6 +161,8 @@ private:
     QList<QChangeQueue *> m_lockingChangeQueues;
     QAbstractPostman *m_postman;
     QScene *m_scene;
+
+    QVector<QNode *> m_dirtyFrontEndNodes;
 };
 
 } // namespace Qt3DCore