1 /*=========================================================================
2
3 Program: Visualization Toolkit
4 Module: vtkOpenGLVolumeTransferFunction2D.cxx
5
6 Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
7 All rights reserved.
8 See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
9
10 This software is distributed WITHOUT ANY WARRANTY; without even
11 the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
12 PURPOSE. See the above copyright notice for more information.
13
14 =========================================================================*/
15
16 #include "vtkOpenGLVolumeTransferFunction2D.h"
17
18 #include "vtkDataArray.h"
19 #include "vtkImageData.h"
20 #include "vtkImageResize.h"
21 #include "vtkObjectFactory.h"
22 #include "vtkOpenGLRenderWindow.h"
23 #include "vtkPointData.h"
24 #include "vtkTextureObject.h"
25
26 vtkStandardNewMacro(vtkOpenGLVolumeTransferFunction2D);
27
28 //------------------------------------------------------------------------------
vtkOpenGLVolumeTransferFunction2D()29 vtkOpenGLVolumeTransferFunction2D::vtkOpenGLVolumeTransferFunction2D()
30 {
31 this->NumberOfColorComponents = 4;
32 }
33
34 //------------------------------------------------------------------------------
InternalUpdate(vtkObject * func,int vtkNotUsed (blendMode),double vtkNotUsed (sampleDistance),double vtkNotUsed (unitDistance),int filterValue)35 void vtkOpenGLVolumeTransferFunction2D::InternalUpdate(vtkObject* func, int vtkNotUsed(blendMode),
36 double vtkNotUsed(sampleDistance), double vtkNotUsed(unitDistance), int filterValue)
37 {
38 vtkImageData* transfer2D = vtkImageData::SafeDownCast(func);
39 if (!transfer2D)
40 {
41 return;
42 }
43 int* dims = transfer2D->GetDimensions();
44 // Resample if there is a size restriction
45 void* data = transfer2D->GetPointData()->GetScalars()->GetVoidPointer(0);
46 if (dims[0] != this->TextureWidth || dims[1] != this->TextureHeight)
47 {
48 this->ResizeFilter->SetInputData(transfer2D);
49 this->ResizeFilter->SetResizeMethodToOutputDimensions();
50 this->ResizeFilter->SetOutputDimensions(this->TextureWidth, this->TextureHeight, 1);
51 this->ResizeFilter->Update();
52 data = this->ResizeFilter->GetOutput()->GetPointData()->GetScalars()->GetVoidPointer(0);
53 }
54
55 this->TextureObject->SetWrapS(vtkTextureObject::ClampToEdge);
56 this->TextureObject->SetWrapT(vtkTextureObject::ClampToEdge);
57 this->TextureObject->SetMagnificationFilter(filterValue);
58 this->TextureObject->SetMinificationFilter(filterValue);
59 this->TextureObject->Create2DFromRaw(
60 this->TextureWidth, this->TextureHeight, this->NumberOfColorComponents, VTK_FLOAT, data);
61 }
62
63 //------------------------------------------------------------------------------
NeedsUpdate(vtkObject * func,double[2]vtkNotUsed (scalarRange),int vtkNotUsed (blendMode),double vtkNotUsed (sampleDistance))64 bool vtkOpenGLVolumeTransferFunction2D::NeedsUpdate(vtkObject* func,
65 double[2] vtkNotUsed(scalarRange), int vtkNotUsed(blendMode), double vtkNotUsed(sampleDistance))
66 {
67 if (!func)
68 {
69 return false;
70 }
71 if (func->GetMTime() > this->BuildTime || this->TextureObject->GetMTime() > this->BuildTime ||
72 !this->TextureObject->GetHandle())
73 {
74 return true;
75 }
76 return false;
77 }
78
79 //------------------------------------------------------------------------------
AllocateTable()80 void vtkOpenGLVolumeTransferFunction2D::AllocateTable() {}
81
82 //------------------------------------------------------------------------------
PrintSelf(ostream & os,vtkIndent indent)83 void vtkOpenGLVolumeTransferFunction2D::PrintSelf(ostream& os, vtkIndent indent)
84 {
85 this->Superclass::PrintSelf(os, indent);
86 }
87