vtkOpenGLHAVSVolumeMapper.h

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/*=========================================================================

Program:   Visualization Toolkit
Module:    vtkOpenGLHAVSVolumeMapper.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.

=========================================================================*/

/* Copyright 2005, 2006 by University of Utah. */

#ifndef vtkOpenGLHAVSVolumeMapper_h
#define vtkOpenGLHAVSVolumeMapper_h

#include "vtkRenderingVolumeOpenGLModule.h" // For export macro
#include "vtkHAVSVolumeMapper.h"

#include "vtkWeakPointer.h" // to cache the vtkRenderWindow
class vtkRenderer;
class vtkRenderWindow;


class VTKRENDERINGVOLUMEOPENGL_EXPORT vtkOpenGLHAVSVolumeMapper
  : public vtkHAVSVolumeMapper
{
public:
  static vtkOpenGLHAVSVolumeMapper *New();
  vtkTypeMacro(vtkOpenGLHAVSVolumeMapper,
                       vtkHAVSVolumeMapper);
  void PrintSelf(ostream& os, vtkIndent indent) VTK_OVERRIDE;

  virtual void Render(vtkRenderer *ren, vtkVolume *vol);

  virtual void ReleaseGraphicsResources(vtkWindow *);

  virtual void SetGPUDataStructures(bool);

  virtual bool SupportedByHardware(vtkRenderer *r);
protected:

  vtkOpenGLHAVSVolumeMapper();
  ~vtkOpenGLHAVSVolumeMapper();
  virtual int FillInputPortInformation(int port, vtkInformation* info);

  virtual void Initialize(vtkRenderer *ren, vtkVolume *vol);
  virtual void InitializeLookupTables(vtkVolume *vol);
  void InitializeGPUDataStructures();
  void InitializeShaders();
  void DeleteShaders();
  void InitializeFramebufferObject();

  void RenderHAVS(vtkRenderer *ren);
  void SetupFBOZBuffer(int screenWidth, int screenHeight, float depthNear, float depthFar,
                       float *zbuffer);
  void SetupFBOMRT();
  void DrawFBOInit(int screenWidth, int screenHeight, float depthNear, float depthFar);
  void DrawFBOGeometry();
  void DrawFBOFlush(int screenWidth, int screenHeight, float depthNear, float depthFar);
  void DrawBlend(int screenWidth, int screenHeight, float depthNear, float depthFar);

  void CheckOpenGLError(const char *str);

  // GPU
  unsigned int VBOVertexName;
  unsigned int VBOTexCoordName;
  unsigned int VBOVertexIndexName;
  unsigned int VertexProgram;
  unsigned int FragmentProgramBegin;
  unsigned int FragmentProgram;
  unsigned int FragmentProgramEnd;
  unsigned int FramebufferObject;
  int FramebufferObjectSize;
  unsigned int FramebufferTextures[4];
  unsigned int DepthTexture;

  // Lookup Tables
  unsigned int PsiTableTexture;
  unsigned int TransferFunctionTexture;

  vtkWeakPointer<vtkRenderWindow> RenderWindow;

private:
  vtkOpenGLHAVSVolumeMapper(const vtkOpenGLHAVSVolumeMapper&) VTK_DELETE_FUNCTION;
  void operator=(const vtkOpenGLHAVSVolumeMapper&) VTK_DELETE_FUNCTION;
};

#endif