vtkDepthPeelingPass.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkDepthPeelingPass.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.
 
=========================================================================*/
#ifndef vtkDepthPeelingPass_h
#define vtkDepthPeelingPass_h
 
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkRenderPass.h"
#include <vector>  // STL Header
 
class vtkTextureObject;
class vtkOpenGLRenderWindow;
class vtkInformationIntegerKey;
class vtkInformationIntegerVectorKey;
class vtkOpenGLHelper;
 
class VTKRENDERINGOPENGL2_EXPORT vtkDepthPeelingPass : public vtkRenderPass
{
public:
  static vtkDepthPeelingPass *New();
  vtkTypeMacro(vtkDepthPeelingPass,vtkRenderPass);
  void PrintSelf(ostream& os, vtkIndent indent);
 
  //BTX
 
  virtual void Render(const vtkRenderState *s);
  //ETX
 
  void ReleaseGraphicsResources(vtkWindow *w);
 
 
  vtkGetObjectMacro(TranslucentPass,vtkRenderPass);
  virtual void SetTranslucentPass(vtkRenderPass *translucentPass);
 
 
  vtkSetClampMacro(OcclusionRatio,double,0.0,0.5);
  vtkGetMacro(OcclusionRatio,double);
 
 
  vtkSetMacro(MaximumNumberOfPeels,int);
  vtkGetMacro(MaximumNumberOfPeels,int);
 
 
  vtkGetMacro(LastRenderingUsedDepthPeeling,bool);
 
  static vtkInformationIntegerKey *OpaqueZTextureUnit();
 
  static vtkInformationIntegerKey *TranslucentZTextureUnit();
 
  static vtkInformationIntegerVectorKey *DestinationSize();
 
 protected:
  vtkDepthPeelingPass();
 
  virtual ~vtkDepthPeelingPass();
 
  vtkRenderPass *TranslucentPass;
  vtkTimeStamp CheckTime;
  bool IsSupported;
 
 
  int ViewportX;
  int ViewportY;
  int ViewportWidth;
  int ViewportHeight;
 
  unsigned int DepthFormat;
 
  double OcclusionRatio;
 
  int MaximumNumberOfPeels;
 
  bool LastRenderingUsedDepthPeeling;
 
  // Is rendering at translucent geometry stage using depth peeling and
  // rendering a layer other than the first one? (Boolean value)
  // If so, the uniform variables UseTexture and Texture can be set.
  // (Used by vtkOpenGLProperty or vtkOpenGLTexture)
  int DepthPeelingHigherLayer;
 
  vtkOpenGLHelper *FinalBlendProgram;
  vtkOpenGLHelper *IntermediateBlendProgram;
 
  vtkTextureObject *OpaqueZTexture;
  vtkTextureObject *OpaqueRGBATexture;
  vtkTextureObject *TranslucentRGBATexture;
  vtkTextureObject *TranslucentZTexture;
  vtkTextureObject *CurrentRGBATexture;
  std::vector<float> *DepthZData;
 
  void BlendIntermediatePeels(vtkOpenGLRenderWindow *renWin, bool);
  void BlendFinalPeel(vtkOpenGLRenderWindow *renWin);
 
 private:
  vtkDepthPeelingPass(const vtkDepthPeelingPass&);  // Not implemented.
  void operator=(const vtkDepthPeelingPass&);  // Not implemented.
};
 
#endif