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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLVolumeGradientOpacityTable.cxx
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.
=========================================================================*/
#include "vtkOpenGLVolumeGradientOpacityTable.h"
#include "vtkObjectFactory.h"
#include "vtkOpenGLRenderWindow.h"
#include "vtkPiecewiseFunction.h"
#include "vtkTextureObject.h"
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkOpenGLVolumeGradientOpacityTable);
// Update opacity transfer function texture.
//------------------------------------------------------------------------------
void vtkOpenGLVolumeGradientOpacityTable::InternalUpdate(vtkObject* func, int vtkNotUsed(blendMode),
double vtkNotUsed(sampleDistance), double vtkNotUsed(unitDistance), int filterValue)
{
vtkPiecewiseFunction* gradientOpacity = vtkPiecewiseFunction::SafeDownCast(func);
if (!gradientOpacity)
{
return;
}
gradientOpacity->GetTable(
0, (this->LastRange[1] - this->LastRange[0]) * 0.25, this->TextureWidth, this->Table);
this->TextureObject->Create2DFromRaw(
this->TextureWidth, 1, this->NumberOfColorComponents, VTK_FLOAT, this->Table);
this->TextureObject->SetWrapS(vtkTextureObject::ClampToEdge);
this->TextureObject->SetMagnificationFilter(filterValue);
this->TextureObject->SetMinificationFilter(filterValue);
this->BuildTime.Modified();
}
//------------------------------------------------------------------------------
void vtkOpenGLVolumeGradientOpacityTable::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
VTK_ABI_NAMESPACE_END
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