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+// Viewer.hxx -- alternative flightgear viewer application
+//
+// Copyright (C) 2009 - 2012  Mathias Froehlich
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifndef _fgviewer_SlaveCamera_hxx
+#define _fgviewer_SlaveCamera_hxx
+
+#include <string>
+#include <osg/Camera>
+#include <simgear/math/SGMath.hxx>
+#include <simgear/structure/SGWeakReferenced.hxx>
+
+#include "Frustum.hxx"
+
+namespace fgviewer  {
+
+class Viewer;
+
+class SlaveCamera : public SGWeakReferenced {
+public:
+    SlaveCamera(const std::string& name);
+    virtual ~SlaveCamera();
+    
+    const std::string& getName() const
+    { return _name; }
+
+    /// The drawable this camera renders to
+    bool setDrawableName(const std::string& drawableName);
+    const std::string& getDrawableName() const
+    { return _drawableName; }
+    
+    /// The viewport into the above drawable
+    virtual bool setViewport(const SGVec4i& viewport);
+    SGVec4i getViewport() const
+    { return SGVec4i(_viewport->x(), _viewport->y(), _viewport->width(), _viewport->height()); }
+    double getAspectRatio() const
+    { return _viewport->aspectRatio(); }
+    
+    /// The view offset, usually an orientation offset
+    virtual bool setViewOffset(const osg::Matrix& viewOffset);
+    const osg::Matrix& getViewOffset() const
+    { return _viewOffset; }
+    bool setViewOffsetDeg(double headingDeg, double pitchDeg, double rollDeg);
+    
+    /// The frustum for this camera
+    virtual bool setFrustum(const Frustum& frustum);
+    const Frustum& getFrustum() const
+    { return _frustum; }
+    void setFustumByFieldOfViewDeg(double fieldOfViewDeg);
+    bool setRelativeFrustum(const std::string names[2], const SlaveCamera& referenceCameraData,
+                            const std::string referenceNames[2]);
+
+    /// For relative cameras configure the reference points that should match
+    void setProjectionReferencePoint(const std::string& name, const osg::Vec2& point);
+    osg::Vec2 getProjectionReferencePoint(const std::string& name) const;
+    /// Set the reference points for a monitor configuration
+    void setMonitorProjectionReferences(double width, double height,
+                                        double bezelTop, double bezelBottom,
+                                        double bezelLeft, double bezelRight);
+
+    /// Access parameters of this view/camera
+    osg::Vec3 getLeftEyeOffset(const Viewer& viewer) const;
+    osg::Vec3 getRightEyeOffset(const Viewer& viewer) const;
+    double getZoomFactor(const Viewer& viewer) const;
+    osg::Matrix getEffectiveViewOffset(const Viewer& viewer) const;
+    Frustum getEffectiveFrustum(const Viewer& viewer) const;
+
+    /// The top level camera holding the context
+    osg::Camera* getCamera()
+    { return _camera.get(); }
+    
+    /// Top level entry points
+    bool realize(Viewer& viewer);
+    bool update(Viewer& viewer);
+    
+protected:
+    virtual osg::Camera* _realizeImplementation(Viewer& viewer);
+    virtual bool _updateImplementation(Viewer& viewer);
+    
+private:
+    SlaveCamera(const SlaveCamera&);
+    SlaveCamera& operator=(const SlaveCamera&);
+
+    /// The immutable name that is used to reference this slave camera.
+    const std::string _name;
+    std::string _drawableName;
+    osg::ref_ptr<osg::Viewport> _viewport;
+    osg::Matrix _viewOffset;
+    Frustum _frustum;
+    /// The camera that is attached to the slave and that has a context attached.
+    osg::ref_ptr<osg::Camera> _camera;
+
+    /// For relative views, the named reference points in the projection space
+    typedef std::map<std::string, osg::Vec2> NameReferencePointMap;
+    NameReferencePointMap _referencePointMap;
+};
+
+} // namespace fgviewer
+
+#endif