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/*=========================================================================
Program: Visualization Toolkit
Module: vtkVolumeInputHelper.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.
=========================================================================*/
/**
* @class vtkVolumeInputHelper
* @brief Convenience container for internal structures specific to a volume
* input.
*
* This class stores together vtkVolumeTexture, Lookup tables internal
* and other input specific parameters. It also provides convenience methods
* to manage the lookup tables.
*
* @warning This is an internal class of vtkOpenGLGPUVolumeRayCastMapper. It
* assumes there is an active OpenGL context in methods involving GL calls
* (MakeCurrent() is expected to be called in the mapper beforehand).
*
* \sa vtkOpenGLGPUVolumeRayCastMapper
*/
#ifndef vtkVolumeInputHelper_h
#define vtkVolumeInputHelper_h
#include <map>
#include "vtkOpenGLVolumeLookupTables.h"
#include "vtkRenderingVolumeOpenGL2Module.h" // For export macro
#include "vtkSmartPointer.h" // For SmartPointer
#include "vtkTimeStamp.h" // For TimeStamp
VTK_ABI_NAMESPACE_BEGIN
class vtkOpenGLVolumeGradientOpacityTable;
class vtkOpenGLVolumeOpacityTable;
class vtkOpenGLVolumeRGBTable;
class vtkOpenGLVolumeTransferFunction2D;
class vtkRenderer;
class vtkShaderProgram;
class vtkVolume;
class vtkVolumeTexture;
class vtkWindow;
class VTKRENDERINGVOLUMEOPENGL2_EXPORT vtkVolumeInputHelper
{
public:
vtkVolumeInputHelper() = default;
vtkVolumeInputHelper(vtkSmartPointer<vtkVolumeTexture> tex, vtkVolume* vol);
void RefreshTransferFunction(
vtkRenderer* ren, const int uniformIndex, const int blendMode, const float samplingDist);
void ForceTransferInit();
void ActivateTransferFunction(vtkShaderProgram* prog, const int blendMode);
void DeactivateTransferFunction(const int blendMode);
void ReleaseGraphicsResources(vtkWindow* window);
vtkSmartPointer<vtkVolumeTexture> Texture;
vtkVolume* Volume = nullptr;
/**
* Defines the various component modes supported by
* vtkGPUVolumeRayCastMapper.
*/
enum ComponentMode
{
INVALID = 0,
INDEPENDENT = 1,
LA = 2,
RGBA = 4
};
int ComponentMode = INDEPENDENT;
/**
* Transfer function internal structures and helpers.
*/
vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeGradientOpacityTable>>
GradientOpacityTables;
vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeOpacityTable>> OpacityTables;
vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeRGBTable>> RGBTables;
vtkSmartPointer<vtkOpenGLVolumeLookupTables<vtkOpenGLVolumeTransferFunction2D>>
TransferFunctions2D;
/**
* Maps uniform texture variable names to its corresponding texture unit.
*/
std::map<int, std::string> RGBTablesMap;
std::map<int, std::string> OpacityTablesMap;
std::map<int, std::string> GradientOpacityTablesMap;
std::map<int, std::string> TransferFunctions2DMap;
/**
* These values currently stored in vtkGPUVolumeRCMapper but should be moved
* into vtkVolumeProperty in order to store them closer to the relevant
* transfer functions and separately for each input.
*/
int ColorRangeType = 0; // vtkGPUVolumeRayCastMapper::SCALAR
int ScalarOpacityRangeType = 0; // vtkGPUVolumeRayCastMapper::SCALAR
int GradientOpacityRangeType = 0; // vtkGPUVolumeRayCastMapper::SCALAR
/**
* Stores the uniform variable name where the gradient will be stored for
* this input in the fragment shader.
*/
std::string GradientCacheName;
protected:
void InitializeTransferFunction(vtkRenderer* ren, const int index);
void CreateTransferFunction1D(vtkRenderer* ren, const int index);
void CreateTransferFunction2D(vtkRenderer* ren, const int index);
void UpdateTransferFunctions(vtkRenderer* ren, const int blendMode, const float samplingDist);
int UpdateOpacityTransferFunction(vtkRenderer* ren, vtkVolume* vol, unsigned int component,
const int blendMode, const float samplingDist);
int UpdateColorTransferFunction(vtkRenderer* ren, vtkVolume* vol, unsigned int component);
int UpdateGradientOpacityTransferFunction(
vtkRenderer* ren, vtkVolume* vol, unsigned int component, const float samplingDist);
void UpdateTransferFunction2D(vtkRenderer* ren, unsigned int component);
void ReleaseGraphicsTransfer1D(vtkWindow* window);
void ReleaseGraphicsTransfer2D(vtkWindow* window);
vtkTimeStamp LutInit;
bool InitializeTransfer = true;
};
VTK_ABI_NAMESPACE_END
#endif // vtkVolumeInputHelper_h
// VTK-HeaderTest-Exclude: vtkVolumeInputHelper.h
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