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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLVolumeTransferFunction2D.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 vtkOpenGLVolumeTransferFunction2D_h
#define vtkOpenGLVolumeTransferFunction2D_h
#include "vtkImageResize.h" // for vtkImageResize
#include "vtkOpenGLVolumeLookupTable.h"
#include "vtkRenderingVolumeOpenGL2Module.h" // For export macro
#include "vtkNew.h" // for vtkNew
// Forward declarations
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLRenderWindow;
/**
* \brief 2D Transfer function container.
*
* Manages the texture fetched by the fragment shader when TransferFunction2D
* mode is active. Update() assumes the vtkImageData instance used as source
* is of type VTK_FLOAT and has 4 components (vtkVolumeProperty ensures this
* is the case when the function is set).
*
* \sa vtkVolumeProperty::SetTransferFunction2D
*/
class VTKRENDERINGVOLUMEOPENGL2_EXPORT vtkOpenGLVolumeTransferFunction2D
: public vtkOpenGLVolumeLookupTable
{
public:
vtkTypeMacro(vtkOpenGLVolumeTransferFunction2D, vtkOpenGLVolumeLookupTable);
void PrintSelf(ostream& os, vtkIndent indent) override;
static vtkOpenGLVolumeTransferFunction2D* New();
protected:
vtkOpenGLVolumeTransferFunction2D();
/**
* Update the internal texture object using the 2D image data
*/
void InternalUpdate(vtkObject* func, int blendMode, double sampleDistance, double unitDistance,
int filterValue) override;
/**
* Override needs update to not test for scalar range changes since the range
* is encoded in the vtkImageData
*/
bool NeedsUpdate(
vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance) override;
/**
* Override allocate table to do nothing as no internal table management is
* needed.
*/
void AllocateTable() override;
vtkNew<vtkImageResize> ResizeFilter;
private:
vtkOpenGLVolumeTransferFunction2D(const vtkOpenGLVolumeTransferFunction2D&) = delete;
void operator=(const vtkOpenGLVolumeTransferFunction2D&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif // vtkOpenGLTransferFunction2D_h
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