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/*=========================================================================
Program: Visualization Toolkit
Module: vtkStructuredGridLIC2D.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.
=========================================================================*/
// .NAME vtkStructuredGridLIC2D
// .SECTION Description
// GPU implementation of a Line Integral Convolution, a technique for
// imaging vector fields.
//
// The input on port 0 is an 2D vtkStructuredGrid. It needs
// a vector field on point data.
// Port 1 is a special port for customized noise input. It is an optional port.
// If not present, noise is generated by the filter. Even if none-power-of-two
// texture are supported, giving a power-of-two image may result in faster
// execution on the GPU.
//
// Please refer to Forssell, L. K., “Visualizing flow over curvilinear grid
// surfaces using line integral convolution”, Visualization 94 Conference
// Proceedings, pages 240-247, IEEE Computer Society, 1994 for details of the
// algorithm.
//
// .SECTION Required OpenGL Extensions
// GL_ARB_texture_non_power_of_two
// GL_VERSION_2_0
// GL_ARB_texture_float
// GL_ARB_draw_buffers
// GL_EXT_framebuffer_object
// GL_ARB_pixel_buffer_object
#ifndef __vtkStructuredGridLIC2D_h
#define __vtkStructuredGridLIC2D_h
#include "vtkStructuredGridAlgorithm.h"
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.
class vtkRenderWindow;
class vtkImageNoiseSource;
class VTK_HYBRID_EXPORT vtkStructuredGridLIC2D : public vtkStructuredGridAlgorithm
{
public:
static vtkStructuredGridLIC2D* New();
vtkTypeMacro(vtkStructuredGridLIC2D, vtkStructuredGridAlgorithm);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Get/Set the context. Context must be a vtkOpenGLRenderWindow.
// This does not increase the reference count of the
// context to avoid reference loops.
// SetContext() may raise an error is the OpenGL context does not support the
// required OpenGL extensions. Return 0 upon failure and 1 upon success.
int SetContext( vtkRenderWindow * context );
vtkRenderWindow * GetContext();
// Description:
// Number of steps. Initial value is 1.
// class invariant: Steps>0.
// In term of visual quality, the greater the better.
vtkSetMacro(Steps,int);
vtkGetMacro(Steps,int);
// Description:
// Step size.
// WE ARE NOT SURE YET about the space where we define the step.
// If the image data has different spacing in each dimension, it
// is an issue.
// Initial value is 1.0.
// class invariant: StepSize>0.0.
// In term of visual quality, the smaller the better.
// The type for the interface is double as VTK interface is double
// but GPU only supports float. This value will be converted to
// float in the execution of the algorithm.
vtkSetMacro(StepSize,double);
vtkGetMacro(StepSize,double);
// Description:
// The the magnification factor. Default is 1
vtkSetClampMacro(Magnification, int, 1, VTK_INT_MAX);
vtkGetMacro(Magnification, int);
// Description:
// Check if the required OpenGL extensions / GPU are supported.
vtkGetMacro( OpenGLExtensionsSupported, int );
// Description:
// Check if FBO is started properly.
int GetFBOSuccess() { return this->FBOSuccess; }
// Description:
// Check if LIC runs properly.
int GetLICSuccess() { return this->LICSuccess; }
//BTX
protected:
vtkStructuredGridLIC2D();
~vtkStructuredGridLIC2D();
// Description:
// Fill the input port information objects for this algorithm. This
// is invoked by the first call to GetInputPortInformation for each
// port so subclasses can specify what they can handle.
// Redefined from the superclass.
virtual int FillInputPortInformation(int port,
vtkInformation *info);
// Description:
// Fill the output port information objects for this algorithm.
// This is invoked by the first call to GetOutputPortInformation for
// each port so subclasses can specify what they can handle.
// Redefined from the superclass.
virtual int FillOutputPortInformation(int port,
vtkInformation *info);
virtual int RequestInformation(vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector);
int RequestUpdateExtent (vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector);
// Description:
// Stolen from vtkImageAlgorithm. Should be in vtkStructuredGridAlgorithm.
void AllocateOutputData(vtkDataObject *output,
int outputPort);
// Description:
// Stolen from vtkImageData. Should be in vtkStructuredGrid.
void AllocateScalars(vtkStructuredGrid *sg);
// Description:
// This is called by the superclass.
// This is the method you should override.
virtual int RequestData(vtkInformation *request,
vtkInformationVector **inputVector,
vtkInformationVector *outputVector);
int Steps;
double StepSize;
int Magnification;
int OpenGLExtensionsSupported;
vtkWeakPointer<vtkRenderWindow> Context;
vtkImageNoiseSource* NoiseSource;
bool OwnWindow;
int FBOSuccess;
int LICSuccess;
private:
vtkStructuredGridLIC2D(const vtkStructuredGridLIC2D&); // Not implemented.
void operator=(const vtkStructuredGridLIC2D&); // Not implemented.
//ETX
};
#endif
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