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/*=========================================================================
Program: ParaView
Module: $RCSfile$
Copyright (c) Kitware, Inc.
All rights reserved.
See Copyright.txt or http://www.paraview.org/HTML/Copyright.html for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/**
* @class vtkAMRStreamingPriorityQueue
* @brief implements a coverage based priority
* queue for vtkOverlappingAMR dataset.
*
* vtkAMRStreamingPriorityQueue is used by representations supporting streaming
* of AMR datasets to determine the priorities for blocks in the dataset. This
* class relies on the bounds information provided by the AMR meta-data i.e.
* vtkAMRInformation. This class support view-based priority computation. Simply
* provide the view planes (returned by vtkCamera::GetFrustumPlanes()) to the
* vtkAMRStreamingPriorityQueue::Update() call to update the prorities for the
* blocks currently in the queue.
* @sa
* vtkAMROutlineRepresentation, vtkAMRStreamingVolumeRepresentation.
*/
#ifndef vtkAMRStreamingPriorityQueue_h
#define vtkAMRStreamingPriorityQueue_h
#include "vtkObject.h"
#include "vtkPVClientServerCoreRenderingModule.h" // for export macros
class vtkAMRInformation;
class vtkMultiProcessController;
class VTKPVCLIENTSERVERCORERENDERING_EXPORT vtkAMRStreamingPriorityQueue : public vtkObject
{
public:
static vtkAMRStreamingPriorityQueue* New();
vtkTypeMacro(vtkAMRStreamingPriorityQueue, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;
//@{
/**
* If the controller is specified, the queue can be used in parallel. So long
* as Initialize(), Update() and Pop() methods are called on all processes
* (need not be synchronized) and all process get the same amr tree and
* view_planes (which is generally true with ParaView), the blocks are
* distributed among the processes.
* By default, this is set to the
* vtkMultiProcessController::GetGlobalController();
*/
void SetController(vtkMultiProcessController*);
vtkGetObjectMacro(Controller, vtkMultiProcessController);
//@}
/**
* Initializes the queue. All information about items in the is lost.
*/
void Initialize(vtkAMRInformation* amr);
/**
* Re-initializes the priority queue using the amr structure given to the most
* recent call to Initialize().
*/
void Reinitialize();
//@{
/**
* Updates the priorities of blocks based on the new view frustum planes.
* Information about blocks "popped" from the queue is preserved and those
* blocks are not reinserted in the queue.
*/
void Update(const double view_planes[24], const double clamp_bounds[6]);
void Update(const double view_planes[24]);
//@}
/**
* Returns if the queue is empty.
*/
bool IsEmpty();
/**
* Pops and returns of composite id for the block at the top of the queue.
* Test if the queue is empty before calling this method.
*/
unsigned int Pop();
protected:
vtkAMRStreamingPriorityQueue();
~vtkAMRStreamingPriorityQueue();
vtkMultiProcessController* Controller;
private:
vtkAMRStreamingPriorityQueue(const vtkAMRStreamingPriorityQueue&) VTK_DELETE_FUNCTION;
void operator=(const vtkAMRStreamingPriorityQueue&) VTK_DELETE_FUNCTION;
class vtkInternals;
vtkInternals* Internals;
};
#endif
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