124 lines
3.6 KiB
C
124 lines
3.6 KiB
C
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkOpenGLVolumeLookupTable.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/*=============================================================================
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Copyright and License information
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=============================================================================*/
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/**
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* @class vtkOpenGLVolumeLookupTable
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* @brief Base class for OpenGL texture management of scalar color,
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* opacity and gradient opacity lookup tables.
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*/
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#ifndef vtkOpenGLVolumeLookupTable_h
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#define vtkOpenGLVolumeLookupTable_h
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#include "vtkObject.h"
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#include "vtkRenderingVolumeOpenGL2Module.h" // For export macro
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// Forward declarations
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class vtkOpenGLRenderWindow;
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class vtkTextureObject;
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class vtkWindow;
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class VTKRENDERINGVOLUMEOPENGL2_EXPORT vtkOpenGLVolumeLookupTable : public vtkObject
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{
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public:
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vtkTypeMacro(vtkOpenGLVolumeLookupTable, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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// static vtkOpenGLVolumeLookupTable* New();
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/**
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* Get the texture unit associated with the managed texture object
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*/
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int GetTextureUnit();
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/**
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* Activate / deactivate the internal texture object
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*/
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///@{
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void Activate();
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void Deactivate();
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///@}
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/**
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* Get the maximum supported texture width for the target OpenGL environment.
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*/
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int GetMaximumSupportedTextureWidth(vtkOpenGLRenderWindow* renWin, int idealWidth);
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/**
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* Release graphics resources
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*/
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void ReleaseGraphicsResources(vtkWindow* window);
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/**
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* Update the internal texture object using the transfer function provided.
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*/
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virtual void Update(vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance,
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double unitDistance, int filterValue, vtkOpenGLRenderWindow* renWin);
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/**
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* Get access to the texture height used by this object
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*/
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vtkGetMacro(TextureHeight, int);
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/**
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* Get access to the texture width used by this object
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*/
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vtkGetMacro(TextureWidth, int);
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protected:
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vtkOpenGLVolumeLookupTable() = default;
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~vtkOpenGLVolumeLookupTable() override;
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double LastRange[2] = { 0.0, 0.0 };
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float* Table = nullptr;
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int LastInterpolation = -1;
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int NumberOfColorComponents = 1;
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int TextureWidth = 1024;
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int TextureHeight = 1;
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vtkTextureObject* TextureObject = nullptr;
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vtkTimeStamp BuildTime;
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/**
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* Test whether the internal function needs to be updated.
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*/
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virtual bool NeedsUpdate(
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vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance);
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/**
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* Internal method to actually update the texture object
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*/
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virtual void InternalUpdate(
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vtkObject* func, int blendMode, double sampleDistance, double unitDistance, int filterValue);
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/**
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* Compute ideal width and height for the texture based on function provided
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*/
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virtual void ComputeIdealTextureSize(
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vtkObject* func, int& width, int& height, vtkOpenGLRenderWindow* renWin);
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/**
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* Allocate internal data table
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*/
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virtual void AllocateTable();
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private:
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vtkOpenGLVolumeLookupTable(const vtkOpenGLVolumeLookupTable&) = delete;
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void operator=(const vtkOpenGLVolumeLookupTable&) = delete;
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};
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#endif // vtkOpenGLVolumeLookupTable_h
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