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 "vtkOpenGLRenderPass.h"
#include <vector>  // STL Header

class vtkTextureObject;
class vtkOpenGLRenderWindow;
class vtkOpenGLHelper;

class VTKRENDERINGOPENGL2_EXPORT vtkDepthPeelingPass
    : public vtkOpenGLRenderPass
{
public:
  static vtkDepthPeelingPass *New();
  vtkTypeMacro(vtkDepthPeelingPass,vtkOpenGLRenderPass);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void Render(const vtkRenderState *s);

  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);

  // vtkOpenGLRenderPass virtuals:
  virtual bool ReplaceShaderValues(std::string &vertexShader,
                                   std::string &geometryShader,
                                   std::string &fragmentShader,
                                   vtkAbstractMapper *mapper,
                                   vtkProp *prop);
  virtual bool SetShaderParameters(vtkShaderProgram *program,
                                   vtkAbstractMapper *mapper, vtkProp *prop);

 protected:
  vtkDepthPeelingPass();

  virtual ~vtkDepthPeelingPass();

  vtkRenderPass *TranslucentPass;
  vtkTimeStamp CheckTime;
  bool IsSupported;


  int ViewportX;
  int ViewportY;
  int ViewportWidth;
  int ViewportHeight;

  double OcclusionRatio;

  int MaximumNumberOfPeels;

  // 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&) VTK_DELETE_FUNCTION;
  void operator=(const vtkDepthPeelingPass&) VTK_DELETE_FUNCTION;
};

#endif