Preperation for adding stereo support direclty into osgViewer.

include/osg/DisplaySettings

@@ -15,6 +15,7 @@
 #define OSG_DisplaySettings 1
 
 #include <osg/Referenced>
+#include <osg/Matrixd>
 #include <osg/ref_ptr>
 
 #include <string>
@@ -184,6 +185,11 @@ class OSG_EXPORT DisplaySettings : public osg::Referenced
         void setSerializeDrawDispatch(bool serializeDrawDispatch) { _serializeDrawDispatch = serializeDrawDispatch; }
         bool getSerializeDrawDispatch() const { return _serializeDrawDispatch; }
 
+
+        void setUseSceneViewForStereoHint(bool hint) { _useSceneViewForStereoHint = hint; }
+        bool getUseSceneViewForStereoHint() const { return _useSceneViewForStereoHint; }
+
+
         /** Set the hint for the total number of threads in the DatbasePager set up, inclusive of the number of http dedicated threads.*/
         void setNumOfDatabaseThreadsHint(unsigned int numThreads) { _numDatabaseThreadsHint = numThreads; }
 
@@ -278,6 +284,22 @@ class OSG_EXPORT DisplaySettings : public osg::Referenced
         /** Get the hint of the profile mask to use in when creating graphic contexts.*/
         unsigned int getGLContextProfileMask() const { return _glContextProfileMask; }
 
+
+
+
+
+        /** helper function for computing the left eye projection matrix.*/
+        virtual osg::Matrixd computeLeftEyeProjectionImplementation(const osg::Matrixd& projection) const;
+
+        /** helper function for computing the left eye view matrix.*/
+        virtual osg::Matrixd computeLeftEyeViewImplementation(const osg::Matrixd& view, double eyeSeperationScale=1.0) const;
+
+        /** helper function for computing the right eye view matrix.*/
+        virtual osg::Matrixd computeRightEyeProjectionImplementation(const osg::Matrixd& projection) const;
+
+        /** helper function for computing the right eye view matrix.*/
+        virtual osg::Matrixd computeRightEyeViewImplementation(const osg::Matrixd& view, double eyeSeperationScale=1.0) const;        
+
     protected:
 
         virtual ~DisplaySettings();
@@ -313,6 +335,7 @@ class OSG_EXPORT DisplaySettings : public osg::Referenced
 
         bool                            _compileContextsHint;
         bool                            _serializeDrawDispatch;
+        bool                            _useSceneViewForStereoHint;
 
         unsigned int                    _numDatabaseThreadsHint;
         unsigned int                    _numHttpDatabaseThreadsHint;

include/osg/Viewport

@@ -64,6 +64,18 @@ class OSG_EXPORT Viewport : public StateAttribute
             return 0; // passed all the above comparison macros, must be equal.
         }
 
+        Viewport& operator = (const Viewport& rhs)
+        {
+            if (&rhs==this) return *this;
+            
+            _x = rhs._x;
+            _y = rhs._y;
+            _width = rhs._width;
+            _height = rhs._height;
+            
+            return *this;
+        }
+
         inline void setViewport(value_type x,value_type y,value_type width,value_type height)
         {
             _x = x;