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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFixedPointRayCastImage.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 "vtkFixedPointRayCastImage.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkFixedPointRayCastImage);
// Construct a new vtkFixedPointRayCastImage with default values
vtkFixedPointRayCastImage::vtkFixedPointRayCastImage()
{
this->ImageViewportSize[0] = 0;
this->ImageViewportSize[1] = 0;
this->ImageMemorySize[0] = 0;
this->ImageMemorySize[1] = 0;
this->ImageInUseSize[0] = 0;
this->ImageInUseSize[1] = 0;
this->ImageOrigin[0] = 0;
this->ImageOrigin[1] = 0;
this->ImageSampleDistance = 0;
this->ZBufferMemorySize = 0;
this->ZBufferSize[0] = 0;
this->ZBufferSize[1] = 0;
this->ZBufferOrigin[0] = 0;
this->ZBufferOrigin[1] = 0;
this->UseZBuffer = 0;
this->Image = NULL;
this->ZBuffer = NULL;
}
// Destruct a vtkFixedPointRayCastImage - clean up any memory used
vtkFixedPointRayCastImage::~vtkFixedPointRayCastImage()
{
delete [] this->Image;
delete [] this->ZBuffer;
}
// Allocate memory
void vtkFixedPointRayCastImage::AllocateImage()
{
delete [] this->Image;
this->Image = NULL;
if ( this->ImageMemorySize[0] > 0 &&
this->ImageMemorySize[1] > 0 )
{
this->Image = new unsigned short [ ( 4 *
this->ImageMemorySize[0] *
this->ImageMemorySize[1] )];
}
}
// Clear image to 0
void vtkFixedPointRayCastImage::ClearImage()
{
unsigned short *ucptr = this->Image;
for ( int i = 0; i < this->ImageMemorySize[0]*this->ImageMemorySize[1]; i++ )
{
*(ucptr++) = 0;
*(ucptr++) = 0;
*(ucptr++) = 0;
*(ucptr++) = 0;
}
}
void vtkFixedPointRayCastImage::AllocateZBuffer()
{
// If we already have a buffer big enough, don't
// bother to do anything
if ( this->ZBufferSize[0]*this->ZBufferSize[1] >
this->ZBufferMemorySize )
{
// If our current buffer is not large enough, delete it
delete [] this->ZBuffer;
this->ZBuffer = NULL;
// Try out a size equal to the viewport in pixels
this->ZBufferMemorySize =
this->ImageViewportSize[0] * this->ImageViewportSize[1];
// This shouldn't ever happen, but just in case....
// If this happens it means that somehow our viewport
// size in pixels is smaller than the zbuffer we are
// requesting - which will probably not make OpenGL
// very happy.
if ( this->ZBufferMemorySize <
this->ZBufferSize[0]*this->ZBufferSize[1] )
{
this->ZBufferMemorySize =
this->ZBufferSize[0] * this->ZBufferSize[1];
}
// Allocate the memory
this->ZBuffer = new float [this->ZBufferMemorySize];
}
}
float vtkFixedPointRayCastImage::GetZBufferValue(int x, int y)
{
if ( !this->UseZBuffer )
{
return 1.0;
}
int xPos, yPos;
xPos = static_cast<int>(static_cast<float>(x) * this->ImageSampleDistance);
yPos = static_cast<int>(static_cast<float>(y) * this->ImageSampleDistance);
xPos = (xPos >= this->ZBufferSize[0])?(this->ZBufferSize[0]-1):(xPos);
yPos = (yPos >= this->ZBufferSize[1])?(this->ZBufferSize[1]-1):(yPos);
return *(this->ZBuffer + yPos*this->ZBufferSize[0] + xPos);
}
void vtkFixedPointRayCastImage::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Image Viewport Size: "
<< this->ImageViewportSize[0] << " "
<< this->ImageViewportSize[1] << endl;
os << indent << "Image Memory Size: "
<< this->ImageMemorySize[0] << " "
<< this->ImageMemorySize[1] << endl;
os << indent << "Image In Use Size: "
<< this->ImageInUseSize[0] << " "
<< this->ImageInUseSize[1] << endl;
os << indent << "Image Origin: "
<< this->ImageOrigin[0] << " "
<< this->ImageOrigin[1] << endl;
os << indent << "Image Sample Distance: "
<< this->ImageSampleDistance << endl;
os << indent << "Use ZBuffer: "
<< (this->UseZBuffer ? "On" : "Off") << endl;
os << indent << "ZBuffer Origin: "
<< this->ZBufferOrigin[0] << " "
<< this->ZBufferOrigin[1] << endl;
os << indent << "ZBuffer Size: "
<< this->ZBufferSize[0] << " "
<< this->ZBufferSize[1] << endl;
}
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