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

  Program:   Visualization Toolkit
  Module:    vtkCompositeZPass.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 vtkCompositeZPass_h
#define vtkCompositeZPass_h

#include "vtkRenderingParallelModule.h" // For export macro
#include "vtkRenderPass.h"

class vtkMultiProcessController;

class vtkPixelBufferObject;
class vtkTextureObject;
class vtkOpenGLRenderWindow;
#ifdef VTKGL2
namespace vtkgl
{
class CellBO;
}
#else
class vtkShaderProgram2;
#endif

class VTKRENDERINGPARALLEL_EXPORT vtkCompositeZPass : public vtkRenderPass
{
public:
  static vtkCompositeZPass *New();
  vtkTypeMacro(vtkCompositeZPass,vtkRenderPass);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void Render(const vtkRenderState *s);

  void ReleaseGraphicsResources(vtkWindow *w);


  vtkGetObjectMacro(Controller,vtkMultiProcessController);
  virtual void SetController(vtkMultiProcessController *controller);

  bool IsSupported(vtkOpenGLRenderWindow *context);

 protected:
  vtkCompositeZPass();

  virtual ~vtkCompositeZPass();

  void CreateProgram(vtkOpenGLRenderWindow *context);

  vtkMultiProcessController *Controller;

  vtkPixelBufferObject *PBO;
  vtkTextureObject *ZTexture;
#ifdef VTKGL2
  vtkgl::CellBO *Program;
#else
  vtkShaderProgram2 *Program;
#endif
  float *RawZBuffer;
  size_t RawZBufferSize;

 private:
  vtkCompositeZPass(const vtkCompositeZPass&);  // Not implemented.
  void operator=(const vtkCompositeZPass&);  // Not implemented.
};

#endif