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

  Program:   Visualization Toolkit
  Module:    vtkShadowMapPass.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 vtkShadowMapBakerPass_h
#define vtkShadowMapBakerPass_h

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

class vtkOpenGLRenderWindow;
class vtkInformationIntegerKey;
class vtkCamera;
class vtkLight;
class vtkFrameBufferObject;
class vtkShadowMapBakerPassTextures; // internal
class vtkShadowMapBakerPassLightCameras; // internal

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

  static vtkInformationIntegerKey *OCCLUDER();

  // If this key exists on the Propertykeys of a prop, the prop is viewed as a
  // light/shadow receiver. This key is not mutually exclusive with the
  // OCCLUDER() key.
  static vtkInformationIntegerKey *RECEIVER();

  //BTX

  virtual void Render(const vtkRenderState *s);
  //ETX

  void ReleaseGraphicsResources(vtkWindow *w);


  vtkGetObjectMacro(OpaquePass,vtkRenderPass);
  virtual void SetOpaquePass(vtkRenderPass *opaquePass);


  vtkGetObjectMacro(CompositeZPass,vtkRenderPass);
  virtual void SetCompositeZPass(vtkRenderPass *compositeZPass);


  vtkSetMacro(Resolution,unsigned int);
  vtkGetMacro(Resolution,unsigned int);


  vtkSetMacro(PolygonOffsetFactor,float);
  vtkGetMacro(PolygonOffsetFactor,float);


  vtkSetMacro(PolygonOffsetUnits,float);
  vtkGetMacro(PolygonOffsetUnits,float);

  bool GetHasShadows();

  bool LightCreatesShadow(vtkLight *l);

//BTX
  vtkShadowMapBakerPassTextures *GetShadowMaps();


  vtkShadowMapBakerPassLightCameras *GetLightCameras();
//ETX

  bool GetNeedUpdate();

  // // Description:
  // INTERNAL USE ONLY.
  // Internally used by vtkShadowMapBakerPass and vtkShadowMapPass.
  //
  // Set NeedUpate to false. Called by vtkShadowMapPass.
  void SetUpToDate();

 protected:
  vtkShadowMapBakerPass();

  virtual ~vtkShadowMapBakerPass();


  void PointNearFar(double *v,
                    double *pt,
                    double *dir,
                    double &mNear,
                    double &mFar,
                    bool initialized);


  void BoxNearFar(double *bb,
                  double *pt,
                  double *dir,
                  double &mNear,
                  double &mFar);

  //BTX

  void BuildCameraLight(vtkLight *light,
                        double *boundingBox,
                        vtkCamera *lcamera);
  //ETX

  void CheckSupport(vtkOpenGLRenderWindow *w);

  vtkRenderPass *OpaquePass;

  vtkRenderPass *CompositeZPass;

  unsigned int Resolution;

  float PolygonOffsetFactor;
  float PolygonOffsetUnits;

  bool HasShadows;

  vtkFrameBufferObject *FrameBufferObject;

  vtkShadowMapBakerPassTextures *ShadowMaps;
  vtkShadowMapBakerPassLightCameras *LightCameras;


  vtkTimeStamp LastRenderTime;
  bool NeedUpdate;

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

#endif