VTK  9.3.20240329
vtkOpenGLVolumeLookupTable.h
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1 // SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
2 // SPDX-License-Identifier: BSD-3-Clause
9 #ifndef vtkOpenGLVolumeLookupTable_h
10 #define vtkOpenGLVolumeLookupTable_h
11 
12 #include "vtkObject.h"
13 #include "vtkRenderingVolumeOpenGL2Module.h" // For export macro
14 
15 // Forward declarations
16 VTK_ABI_NAMESPACE_BEGIN
18 class vtkTextureObject;
19 class vtkWindow;
20 
21 class VTKRENDERINGVOLUMEOPENGL2_EXPORT vtkOpenGLVolumeLookupTable : public vtkObject
22 {
23 public:
25  void PrintSelf(ostream& os, vtkIndent indent) override;
26 
27  // static vtkOpenGLVolumeLookupTable* New();
28 
33 
38  void Activate();
39  void Deactivate();
41 
46 
51 
55  virtual void Update(vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance,
56  double unitDistance, int filterValue, vtkOpenGLRenderWindow* renWin);
57 
61  vtkGetMacro(TextureHeight, int);
62 
66  vtkGetMacro(TextureWidth, int);
67 
68 protected:
71 
72  double LastRange[2] = { 0.0, 0.0 };
73  float* Table = nullptr;
74  int LastInterpolation = -1;
75  int NumberOfColorComponents = 1;
76  int TextureWidth = 1024;
77  int TextureHeight = 1;
78  vtkTextureObject* TextureObject = nullptr;
80 
84  virtual bool NeedsUpdate(
85  vtkObject* func, double scalarRange[2], int blendMode, double sampleDistance);
86 
90  virtual void InternalUpdate(
91  vtkObject* func, int blendMode, double sampleDistance, double unitDistance, int filterValue);
92 
97  vtkObject* func, int& width, int& height, vtkOpenGLRenderWindow* renWin);
98 
102  virtual void AllocateTable();
103 
104 private:
106  void operator=(const vtkOpenGLVolumeLookupTable&) = delete;
107 };
108 
109 VTK_ABI_NAMESPACE_END
110 #endif // vtkOpenGLVolumeLookupTable_h
a simple class to control print indentation
Definition: vtkIndent.h:108
abstract base class for most VTK objects
Definition: vtkObject.h:162
OpenGL rendering window.
Base class for OpenGL texture management of scalar color, opacity and gradient opacity lookup tables.
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.
virtual void ComputeIdealTextureSize(vtkObject *func, int &width, int &height, vtkOpenGLRenderWindow *renWin)
Compute ideal width and height for the texture based on function provided.
virtual void InternalUpdate(vtkObject *func, int blendMode, double sampleDistance, double unitDistance, int filterValue)
Internal method to actually update the texture object.
virtual bool NeedsUpdate(vtkObject *func, double scalarRange[2], int blendMode, double sampleDistance)
Test whether the internal function needs to be updated.
int GetMaximumSupportedTextureWidth(vtkOpenGLRenderWindow *renWin, int idealWidth)
Get the maximum supported texture width for the target OpenGL environment.
virtual void AllocateTable()
Allocate internal data table.
void ReleaseGraphicsResources(vtkWindow *window)
Release graphics resources.
void Deactivate()
Activate / deactivate the internal texture object.
~vtkOpenGLVolumeLookupTable() override
int GetTextureUnit()
Get the texture unit associated with the managed texture object.
void Activate()
Activate / deactivate the internal texture object.
vtkOpenGLVolumeLookupTable()=default
virtual void Update(vtkObject *func, double scalarRange[2], int blendMode, double sampleDistance, double unitDistance, int filterValue, vtkOpenGLRenderWindow *renWin)
Update the internal texture object using the transfer function provided.
abstracts an OpenGL texture object.
record modification and/or execution time
Definition: vtkTimeStamp.h:44
window superclass for vtkRenderWindow
Definition: vtkWindow.h:48
@ height
Definition: vtkX3D.h:254