/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkVolume.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm 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.

=========================================================================*/
// .NAME vtkVolume - represents a volume (data & properties) in a rendered scene
//
// .SECTION Description
// vtkVolume is used to represent a volumetric entity in a rendering scene.
// It inherits functions related to the volume's position, orientation and
// origin from vtkProp3D. The volume maintains a reference to the
// volumetric data (i.e., the volume mapper). The volume also contains a
// reference to a volume property which contains all common volume rendering
// parameters.

// .SECTION see also
// vtkAbstractVolumeMapper vtkVolumeProperty vtkProp3D

#ifndef vtkVolume_h
#define vtkVolume_h

#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkProp3D.h"

class vtkRenderer;
class vtkPropCollection;
class vtkVolumeCollection;
class vtkWindow;
class vtkVolumeProperty;
class vtkAbstractVolumeMapper;

class VTKRENDERINGCORE_EXPORT vtkVolume : public vtkProp3D
{
public:
  vtkTypeMacro(vtkVolume, vtkProp3D);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Creates a Volume with the following defaults: origin(0,0,0)
  // position=(0,0,0) scale=1 visibility=1 pickable=1 dragable=1
  // orientation=(0,0,0).
  static vtkVolume *New();

  // Description:
  // Set/Get the volume mapper.
  void SetMapper(vtkAbstractVolumeMapper *mapper);
  vtkGetObjectMacro(Mapper, vtkAbstractVolumeMapper);

  // Description:
  // Set/Get the volume property.
  void SetProperty(vtkVolumeProperty *property);
  vtkVolumeProperty *GetProperty();

  // Description:
  // For some exporters and other other operations we must be
  // able to collect all the actors or volumes. This method
  // is used in that process.
  void GetVolumes(vtkPropCollection *vc);

  // Description:
  // Update the volume rendering pipeline by updating the volume mapper
  void Update();

  // Description:
  // Get the bounds - either all six at once
  // (xmin, xmax, ymin, ymax, zmin, zmax) or one at a time.
  double *GetBounds();
  void GetBounds(double bounds[6])
    { this->vtkProp3D::GetBounds(bounds); }
  double GetMinXBound();
  double GetMaxXBound();
  double GetMinYBound();
  double GetMaxYBound();
  double GetMinZBound();
  double GetMaxZBound();

  // Description:
  // Return the MTime also considering the property etc.
  unsigned long int GetMTime();

  // Description:
  // Return the mtime of anything that would cause the rendered image to
  // appear differently. Usually this involves checking the mtime of the
  // prop plus anything else it depends on such as properties, mappers,
  // etc.
  unsigned long GetRedrawMTime();

  // Description:
  // Shallow copy of this vtkVolume. Overloads the virtual vtkProp method.
  void ShallowCopy(vtkProp *prop);

//BTX
  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  // Support the standard render methods.
  // Depending on the mapper type, the volume may be rendered using
  // this method (FRAMEBUFFER volume such as texture mapping will
  // be rendered this way)
  int RenderVolumetricGeometry(vtkViewport *viewport);

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // Release any graphics resources that are being consumed by this volume.
  // The parameter window could be used to determine which graphic
  // resources to release.
  void ReleaseGraphicsResources(vtkWindow *);

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float *GetCorrectedScalarOpacityArray(int);
  float *GetCorrectedScalarOpacityArray()
    { return this->GetCorrectedScalarOpacityArray(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float *GetScalarOpacityArray(int);
  float *GetScalarOpacityArray()
    { return this->GetScalarOpacityArray(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float *GetGradientOpacityArray(int);
  float *GetGradientOpacityArray()
    { return this->GetGradientOpacityArray(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float *GetGrayArray(int);
  float *GetGrayArray()
    { return this->GetGrayArray(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float *GetRGBArray(int);
  float *GetRGBArray()
    { return this->GetRGBArray(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float GetGradientOpacityConstant(int);
  float GetGradientOpacityConstant()
    { return this->GetGradientOpacityConstant(0); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  float  GetArraySize()
    { return static_cast<float>(this->ArraySize); }

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  void UpdateTransferFunctions(vtkRenderer *ren);

  // Description:
  // WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
  // DO NOT USE THIS METHOD OUTSIDE OF THE RENDERING PROCESS
  void UpdateScalarOpacityforSampleSize(vtkRenderer *ren,
                                        float sample_distance);

//ETX

protected:
  vtkVolume();
  ~vtkVolume();

  vtkAbstractVolumeMapper *Mapper;
  vtkVolumeProperty *Property;

  // The rgb transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the rgb transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float *RGBArray[VTK_MAX_VRCOMP];
  vtkTimeStamp RGBArrayMTime[VTK_MAX_VRCOMP];

  // The gray transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the gray transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float *GrayArray[VTK_MAX_VRCOMP];
  vtkTimeStamp GrayArrayMTime[VTK_MAX_VRCOMP];

  // The scalar opacity transfer function array - for unsigned char data this
  // is 256 elements, for short or unsigned short it is 65536 elements
  // This is a sample at each scalar value of the opacity transfer
  // function.  A time stamp is kept to know when it needs rebuilding
  float *ScalarOpacityArray[VTK_MAX_VRCOMP];
  vtkTimeStamp ScalarOpacityArrayMTime[VTK_MAX_VRCOMP];

  // The corrected scalar opacity transfer function array - this is identical
  // to the opacity transfer function array when the step size is 1.
  // In other cases, it is corrected to reflect the new material thickness
  // modelled by a step size different than 1.
  float *CorrectedScalarOpacityArray[VTK_MAX_VRCOMP];
  vtkTimeStamp CorrectedScalarOpacityArrayMTime[VTK_MAX_VRCOMP];

  // CorrectedStepSize is the step size currently modelled by
  // CorrectedArray.  It is used to determine when the
  // CorrectedArray needs to be updated to match SampleDistance
  // in the volume mapper.
  float CorrectedStepSize;

  // Number of elements in the rgb, gray, and opacity transfer function arrays
  int ArraySize;

  // The magnitude of gradient opacity transfer function array
  float GradientOpacityArray[VTK_MAX_VRCOMP][256];
  float GradientOpacityConstant[VTK_MAX_VRCOMP];
  vtkTimeStamp GradientOpacityArrayMTime[VTK_MAX_VRCOMP];

  // Function to compute screen coverage of this volume
  double ComputeScreenCoverage(vtkViewport *vp);

private:
  vtkVolume(const vtkVolume&);  // Not implemented.
  void operator=(const vtkVolume&);  // Not implemented.
};

#endif
