dox/Rendering/vtkFrameBufferObject.h

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

  Program:   Visualization Toolkit
  Module:    vtkFrameBufferObject.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 __vtkFrameBufferObject_h
#define __vtkFrameBufferObject_h

#include "vtkObject.h"
#include "vtkSmartPointer.h" // needed for vtkSmartPointer.
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.
//BTX
#include <vector> // for the lists of logical buffers.
//ETX

class vtkRenderWindow;
class vtkTextureObject;
class vtkOpenGLExtensionManager;

class VTK_RENDERING_EXPORT vtkFrameBufferObject : public vtkObject
{
public:
  static vtkFrameBufferObject* New();
  vtkTypeMacro(vtkFrameBufferObject, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  void SetContext(vtkRenderWindow *context);
  vtkRenderWindow *GetContext();


  bool Start(int width,
             int height,
             bool shaderSupportsTextureInt);
  bool StartNonOrtho(int width,
                     int height,
                     bool shaderSupportsTextureInt);


  void RenderQuad(int minX,
                  int maxX,
                  int minY,
                  int maxY);

  void Bind();

  void UnBind();


  void SetActiveBuffer(unsigned int index)
    {
      this->SetActiveBuffers(1, &index);
    }
  

  void SetActiveBuffers(int numbuffers,
                        unsigned int indices[]);

  // All user specified texture objects must match the FBO dimensions
  // and must have been created by the time Start() gets called.
  // If texture is a 3D texture, zslice identifies the zslice that will be
  // attached to the color buffer.
  // .SECTION Caveat
  // Currently, 1D textures are not supported.
  void SetColorBuffer(unsigned int index,
                      vtkTextureObject *texture,
                      unsigned int zslice=0);

  vtkTextureObject *GetColorBuffer(unsigned int index);
  void RemoveColorBuffer(unsigned int index);
  void RemoveAllColorBuffers();


  void SetDepthBuffer(vtkTextureObject *depthTexture);
  void RemoveDepthBuffer();


  vtkSetMacro(DepthBufferNeeded,bool);
  vtkGetMacro(DepthBufferNeeded,bool);


  void SetNumberOfRenderTargets(unsigned int);
  vtkGetMacro(NumberOfRenderTargets,unsigned int);

  unsigned int GetMaximumNumberOfActiveTargets();

  unsigned int GetMaximumNumberOfRenderTargets();
  

  vtkGetVector2Macro(LastSize,int);

  static bool IsSupported(vtkRenderWindow *renWin);

//BTX
protected:
  void CheckFrameBufferStatus();
  
  void DisplayFrameBufferAttachments();
  
  void DisplayFrameBufferAttachment(unsigned int uattachment);
  
  void DisplayDrawBuffers();
  
  void DisplayReadBuffer();
  
  void DisplayBuffer(int value);
  
  vtkFrameBufferObject();
  ~vtkFrameBufferObject();

  vtkWeakPointer<vtkRenderWindow> Context;

  bool DepthBufferNeeded;
  bool ColorBuffersDirty;
  unsigned int FBOIndex;
  int PreviousFBOIndex; // -1: no previous FBO
  unsigned int DepthBuffer;

  unsigned int NumberOfRenderTargets;
  // TODO: add support for stencil buffer.
 
  int LastSize[2];
 
  void CreateFBO();
  void DestroyFBO();
  void Create(int width,
              int height);
  void CreateBuffers(int width,
                     int height);
  void CreateColorBuffers(int width,
                          int height,
                          bool shaderSupportsTextureInt);
  void Destroy();
  void DestroyBuffers();
  void DestroyColorBuffers();
  void ActivateBuffers();

  bool LoadRequiredExtensions(vtkOpenGLExtensionManager *manager);

  std::vector<unsigned int> UserZSlices;
  std::vector<vtkSmartPointer<vtkTextureObject> > UserColorBuffers;
  std::vector<vtkSmartPointer<vtkTextureObject> > ColorBuffers;
  std::vector<unsigned int> ActiveBuffers;
  vtkSmartPointer<vtkTextureObject> UserDepthBuffer;
  bool DepthBufferDirty;
private:
  vtkFrameBufferObject(const vtkFrameBufferObject&); // Not implemented.
  void operator=(const vtkFrameBufferObject&); // Not implemented.
//ETX
};

#endif