vtkUnstructuredGridVolumeZSweepMapper.h

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

  Program:   Visualization Toolkit
  Module:    vtkUnstructuredGridVolumeZSweepMapper.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.

=========================================================================*/
#ifndef vtkUnstructuredGridVolumeZSweepMapper_h
#define vtkUnstructuredGridVolumeZSweepMapper_h

#include "vtkRenderingVolumeModule.h" // For export macro
#include "vtkUnstructuredGridVolumeMapper.h"

class vtkRenderer;
class vtkVolume;
class vtkRayCastImageDisplayHelper;
class vtkCell;
class vtkGenericCell;
class vtkIdList;
class vtkPriorityQueue;
class vtkTransform;
class vtkMatrix4x4;
class vtkVolumeProperty;
class vtkDoubleArray;
class vtkUnstructuredGridVolumeRayIntegrator;
class vtkRenderWindow;

// Internal classes
namespace vtkUnstructuredGridVolumeZSweepMapperNamespace
{
  class vtkScreenEdge;
  class vtkSpan;
  class vtkPixelListFrame;
  class vtkUseSet;
  class vtkVertices;
  class vtkSimpleScreenEdge;
  class vtkDoubleScreenEdge;
  class vtkVertexEntry;
  class vtkPixelListEntryMemory;
};

class VTKRENDERINGVOLUME_EXPORT vtkUnstructuredGridVolumeZSweepMapper : public vtkUnstructuredGridVolumeMapper
{
public:
  vtkTypeMacro(vtkUnstructuredGridVolumeZSweepMapper,vtkUnstructuredGridVolumeMapper);
  void PrintSelf( ostream& os, vtkIndent indent );

  static vtkUnstructuredGridVolumeZSweepMapper *New();


  vtkSetClampMacro( ImageSampleDistance, float, 0.1f, 100.0f );
  vtkGetMacro( ImageSampleDistance, float );


  vtkSetClampMacro( MinimumImageSampleDistance, float, 0.1f, 100.0f );
  vtkGetMacro( MinimumImageSampleDistance, float );


  vtkSetClampMacro( MaximumImageSampleDistance, float, 0.1f, 100.0f );
  vtkGetMacro( MaximumImageSampleDistance, float );


  vtkSetClampMacro( AutoAdjustSampleDistances, int, 0, 1 );
  vtkGetMacro( AutoAdjustSampleDistances, int );
  vtkBooleanMacro( AutoAdjustSampleDistances, int );


  vtkSetClampMacro( IntermixIntersectingGeometry, int, 0, 1 );
  vtkGetMacro( IntermixIntersectingGeometry, int );
  vtkBooleanMacro( IntermixIntersectingGeometry, int );

  int GetMaxPixelListSize();

  void SetMaxPixelListSize(int size);


  virtual void SetRayIntegrator(vtkUnstructuredGridVolumeRayIntegrator *ri);
  vtkGetObjectMacro(RayIntegrator, vtkUnstructuredGridVolumeRayIntegrator);

  void Render(vtkRenderer *ren,
              vtkVolume *vol);

  vtkGetVectorMacro( ImageInUseSize, int, 2 );
  vtkGetVectorMacro( ImageOrigin, int, 2 );
  vtkGetVectorMacro( ImageViewportSize, int , 2 );

protected:
  vtkUnstructuredGridVolumeZSweepMapper();
  ~vtkUnstructuredGridVolumeZSweepMapper();

  void BuildUseSets();

  int ReorderTriangle(vtkIdType v[3],
                      vtkIdType w[3]);

  void ProjectAndSortVertices(vtkRenderer *ren,
                              vtkVolume *vol);

  void CreateAndCleanPixelList();

  void MainLoop(vtkRenderWindow *renWin);

  void CompositeFunction(double zTarget);

  unsigned char ColorComponentRealToByte(float color);

  void RasterizeFace(vtkIdType faceIds[3], int externalSide);

  void RasterizeTriangle(
            vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertexEntry *ve0,
            vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertexEntry *ve1,
            vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertexEntry *ve2,
            bool exitFace);

  void RasterizeSpan(int y,
           vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkScreenEdge *left,
           vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkScreenEdge *right,
           bool exitFace);

  void RasterizeLine(
             vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertexEntry *v0,
             vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertexEntry *v1,
             bool exitFace);

  void StoreRenderTime(vtkRenderer *ren,
                       vtkVolume *vol,
                       float t);

  float RetrieveRenderTime(vtkRenderer *ren,
                           vtkVolume *vol);

  double GetZBufferValue(int x,
                         int y);

  double GetMinimumBoundsDepth(vtkRenderer *ren,
                               vtkVolume *vol);

  void AllocateUseSet(vtkIdType size);

  void AllocateVertices(vtkIdType size);

  void SavePixelListFrame();

  int MaxPixelListSize;

  float ImageSampleDistance;
  float MinimumImageSampleDistance;
  float MaximumImageSampleDistance;
  int AutoAdjustSampleDistances;

  vtkRayCastImageDisplayHelper *ImageDisplayHelper;

  // This is how big the image would be if it covered the entire viewport
  int ImageViewportSize[2];

  // This is how big the allocated memory for image is. This may be bigger
  // or smaller than ImageFullSize - it will be bigger if necessary to
  // ensure a power of 2, it will be smaller if the volume only covers a
  // small region of the viewport
  int ImageMemorySize[2];

  // This is the size of subregion in ImageSize image that we are using for
  // the current image. Since ImageSize is a power of 2, there is likely
  // wasted space in it. This number will be used for things such as clearing
  // the image if necessary.
  int ImageInUseSize[2];

  // This is the location in ImageFullSize image where our ImageSize image
  // is located.
  int ImageOrigin[2];

  // This is the allocated image
  unsigned char *Image;

  // This is the accumulating double RGBA image
  float *RealRGBAImage;

  float *RenderTimeTable;
  vtkVolume **RenderVolumeTable;
  vtkRenderer **RenderRendererTable;
  int RenderTableSize;
  int RenderTableEntries;

  int IntermixIntersectingGeometry;

  float *ZBuffer;
  int ZBufferSize[2];
  int ZBufferOrigin[2];

  vtkDataArray *Scalars;
  int CellScalars;

  // if use CellScalars, we need to keep track of the
  // values on each side of the face and figure out
  // if the face is used by two cells (twosided) or one cell.
  double FaceScalars[2];
  int FaceSide;

  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkSpan *Span;
  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkPixelListFrame *PixelListFrame;

  // Used by BuildUseSets().
  vtkGenericCell *Cell;

  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkUseSet *UseSet;

  vtkPriorityQueue *EventList;
  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkVertices *Vertices;

  vtkTransform *PerspectiveTransform;
  vtkMatrix4x4 *PerspectiveMatrix;

  // Used by the main loop
  int MaxPixelListSizeReached;
  int XBounds[2];
  int YBounds[2];

  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkSimpleScreenEdge *SimpleEdge;
  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkDoubleScreenEdge *DoubleEdge;

  vtkUnstructuredGridVolumeRayIntegrator *RayIntegrator;
  vtkUnstructuredGridVolumeRayIntegrator *RealRayIntegrator;

  vtkTimeStamp SavedTriangleListMTime;

  // Used during compositing
  vtkDoubleArray *IntersectionLengths;
  vtkDoubleArray *NearIntersections;
  vtkDoubleArray *FarIntersections;

  // Benchmark
  vtkIdType MaxRecordedPixelListSize;


  vtkUnstructuredGridVolumeZSweepMapperNamespace::vtkPixelListEntryMemory *MemoryManager;

private:
  vtkUnstructuredGridVolumeZSweepMapper(const vtkUnstructuredGridVolumeZSweepMapper&) VTK_DELETE_FUNCTION;
  void operator=(const vtkUnstructuredGridVolumeZSweepMapper&) VTK_DELETE_FUNCTION;
};

#endif