DepthPartitioner.hpp

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/***********************************
 Copyright 2018 Ravishankar Mathur
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 ***********************************/

#ifndef _OF_DEPTHPARTITIONER_
#define _OF_DEPTHPARTITIONER_

#include <OpenFrames/Export.h>
#include <OpenFrames/DistanceAccumulator.hpp>
#include <osg/Camera>
#include <osgViewer/View>

namespace OpenFrames
{
  class DepthPartitionCallback;

  class OF_EXPORT DepthPartitioner : public virtual osg::Referenced
  {
  public:
    DepthPartitioner();
    
    bool setViewToPartition(osgViewer::View *view);
    osgViewer::View* getViewToPartition() { return _view; }
    
    DepthPartitionCallback* getCallback() { return _dpCallback; }
    
    osg::Camera* getDPCamera() { return _dpMainSlaveCamera; }
    
  protected:
    ~DepthPartitioner();
    
    osg::ref_ptr<osg::Camera> _dpMainSlaveCamera;
    osg::ref_ptr<DepthPartitionCallback> _dpCallback;
    osgViewer::View *_view;
  };

  class OF_EXPORT DepthPartitionCallback : public osg::View::Slave::UpdateSlaveCallback
  {
  public:
    DepthPartitionCallback();
    
    void reset() { _cameraManager->reset(); }
    
    void setMaxTraversalDepth(unsigned int depth)
    { _distAccumulator->setMaxDepth(depth); }
    
    unsigned int getMaxTraversalDepth() const
    { return _distAccumulator->getMaxDepth(); }
    
    virtual void updateSlave(osg::View& view, osg::View::Slave& slave);
    
    struct CameraManager : public virtual osg::Referenced
    {
      CameraManager() {}
      virtual ~CameraManager() {}
      
      // Get the internal name of a camera
      virtual std::string getCameraName(unsigned int camNum) = 0;
      
      // Create a new camera and add it as a slave to the main view
      virtual void enableCamera(unsigned int camNum,
                                osg::Camera* mainCam,
                                const double &zNear, const double &zFar) = 0;
      
      // Disable all cameras after specified start camera number
      virtual void disableCameras(unsigned int start) = 0;
      
      // Clear all internal cameras and revert the CameraManger to an unused
      // and empty state
      virtual void reset() = 0;
      
      // Specify minimum allowable near plane distance
      virtual double getMinZNear() { return 1.0e-5; }
    };
    
    void setCameraManager(CameraManager *cameraManager);
    
  protected:
    virtual ~DepthPartitionCallback();
    
    // The NodeVisitor that computes depth partitions for the scene
    osg::ref_ptr<DistanceAccumulator> _distAccumulator;
    
    // The camera manager that creates cameras
    osg::ref_ptr<CameraManager> _cameraManager;
    
    unsigned int _numActiveCameras;
  };
  
} // !namespace OpenFrames

#endif