Merge pull request #902 from mp3butcher/oqn

3.6 OQN API convergence

include/osg/OcclusionQueryNode

@@ -82,9 +82,9 @@ public:
     };
 
     /** return a QueryResult for specified Camera, where the QueryResult.valid is true when query results are available, and in which case the QueryResult.numPixels provides the num of pixels in the query result.*/
-    QueryResult getQueryResult( const osg::Camera* cam );
+    QueryResult getQueryResult( const osg::Camera* cam ) const;
 
-    unsigned int getNumPixels( const osg::Camera* cam );
+    unsigned int getNumPixels( const osg::Camera* cam ) const;
 
     virtual void releaseGLObjects( osg::State* state = 0 ) const;
 
@@ -158,8 +158,11 @@ public:
     osg::StateSet* getQueryStateSet();
     const osg::StateSet* getQueryStateSet() const;
 
-    // Get the QueryGeometry object used for occlusion query. Returns 0 if no QueryGeometry is created.
-    osg::QueryGeometry* getQueryGeometry();
+    // Set and get the QueryGeometry object used for the occlusion query.
+    // By default an axis aligned box is used as the query geometry.
+    // Resetting to the default query geometry is done by setting it to 0.
+    // Returns 0 if no QueryGeometry is created.
+    void setQueryGeometry( osg::QueryGeometry* geom );
     const osg::QueryGeometry* getQueryGeometry() const;
 
     // Set and get the StateSet used by the OcclusionQueryNode
@@ -189,17 +192,30 @@ public:
     static void discardDeletedQueryObjects( unsigned int contextID );
 
 protected:
+    enum QueryGeometryState {
+        INVALID,
+        VALID,
+        USER_DEFINED
+    };
+
     virtual ~OcclusionQueryNode();
 
     virtual void createSupportNodes();
 
+    bool isQueryGeometryValid() const { return _queryGeometryState != INVALID; }
+
+    void setQueryGeometryInternal( osg::QueryGeometry* queryGeom,
+                                   osg::Geometry* debugQueryGeom,
+                                   QueryGeometryState state );
+
+    void updateDefaultQueryGeometry();
+
     osg::ref_ptr< osg::Geode > _queryGeode;
     osg::ref_ptr< osg::Geode > _debugGeode;
 
     bool _enabled;
 
-    // If the box of the query geometry is valid.
-    mutable bool _validQueryGeometry;
+    mutable QueryGeometryState _queryGeometryState;
 
     // Tracks the last frame number that we performed a query.
     // User can set how many times  (See setQueryFrameCount).