vtkOpenGLCellToVTKCellMap.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkOpenGLCellToVTKCellMap_h
#define vtkOpenGLCellToVTKCellMap_h
 
#include "vtkNew.h" // for ivars
#include "vtkObject.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkStateStorage.h"           // used for ivars
 
VTK_ABI_NAMESPACE_BEGIN
class vtkCellArray;
class vtkPoints;
 
class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLCellToVTKCellMap : public vtkObject
{
public:
  static vtkOpenGLCellToVTKCellMap* New();
  vtkTypeMacro(vtkOpenGLCellToVTKCellMap, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  // Create supporting arrays that are needed when rendering cell data
  // Some VTK cells have to be broken into smaller cells for OpenGL
  // When we have cell data we have to map cell attributes from the VTK
  // cell number to the actual OpenGL cell
  //
  // The same concept applies to cell based picking
  //
  void BuildCellSupportArrays(vtkCellArray* [4], int representation, vtkPoints* points);
 
  void BuildPrimitiveOffsetsIfNeeded(vtkCellArray* [4], int representation, vtkPoints* points);
 
  vtkIdType ConvertOpenGLCellIdToVTKCellId(bool pointPicking, vtkIdType openGLId);
 
  // rebuilds if needed
  void Update(vtkCellArray** prims, int representation, vtkPoints* points);
 
  size_t GetSize() { return this->CellCellMap.size(); }
 
  vtkIdType* GetPrimitiveOffsets() { return this->PrimitiveOffsets; }
 
  vtkIdType GetValue(size_t i) { return this->CellCellMap[i]; }
 
  // what offset should verts start at
  void SetStartOffset(vtkIdType start);
 
  vtkIdType GetFinalOffset() { return this->PrimitiveOffsets[3] + this->CellMapSizes[3]; }
 
protected:
  vtkOpenGLCellToVTKCellMap();
  ~vtkOpenGLCellToVTKCellMap() override;
 
  std::vector<vtkIdType> CellCellMap;
  vtkIdType CellMapSizes[4];
  vtkIdType PrimitiveOffsets[4];
  int BuildRepresentation;
  int StartOffset = 0;
  vtkStateStorage MapBuildState;
  vtkStateStorage TempState;
 
private:
  vtkOpenGLCellToVTKCellMap(const vtkOpenGLCellToVTKCellMap&) = delete;
  void operator=(const vtkOpenGLCellToVTKCellMap&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif