vtkOpenGLVolumeLookupTable.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkOpenGLVolumeLookupTable_h
#define vtkOpenGLVolumeLookupTable_h
 
#include "vtkObject.h"
#include "vtkRenderingVolumeOpenGL2Module.h" // For export macro
 
// Forward declarations
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLRenderWindow;
class vtkTextureObject;
class vtkWindow;
 
class VTKRENDERINGVOLUMEOPENGL2_EXPORT vtkOpenGLVolumeLookupTable : public vtkObject
{
public:
  vtkTypeMacro(vtkOpenGLVolumeLookupTable, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  // static vtkOpenGLVolumeLookupTable* New();
 
  int GetTextureUnit();
 
  void Activate();
  void Deactivate();
 
  int GetMaximumSupportedTextureWidth(vtkOpenGLRenderWindow* renWin, int idealWidth);
 
  void ReleaseGraphicsResources(vtkWindow* window);
 
  virtual void Update(vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance,
    double unitDistance, int filterValue, vtkOpenGLRenderWindow* renWin);
 
  vtkGetMacro(TextureHeight, int);
 
  vtkGetMacro(TextureWidth, int);
 
protected:
  vtkOpenGLVolumeLookupTable() = default;
  ~vtkOpenGLVolumeLookupTable() override;
 
  double LastRange[2] = { 0.0, 0.0 };
  float* Table = nullptr;
  int LastInterpolation = -1;
  int NumberOfColorComponents = 1;
  int TextureWidth = 1024;
  int TextureHeight = 1;
  vtkTextureObject* TextureObject = nullptr;
  vtkTimeStamp BuildTime;
 
  virtual bool NeedsUpdate(
    vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance);
 
  virtual void InternalUpdate(
    vtkObject* func, int blendMode, double sampleDistance, double unitDistance, int filterValue);
 
  virtual void ComputeIdealTextureSize(
    vtkObject* func, int& width, int& height, vtkOpenGLRenderWindow* renWin);
 
  virtual void AllocateTable();
 
private:
  vtkOpenGLVolumeLookupTable(const vtkOpenGLVolumeLookupTable&) = delete;
  void operator=(const vtkOpenGLVolumeLookupTable&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif // vtkOpenGLVolumeLookupTable_h