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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 vtkShadowMapPass_h
#define vtkShadowMapPass_h

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

class vtkOpenGLRenderWindow;
class vtkInformationIntegerKey;
class vtkCamera;
class vtkLight;
class vtkFrameBufferObject;
class vtkShadowMapPassTextures; // internal
class vtkShadowMapPassLightCameras; // internal
class vtkShaderProgram2;
class vtkImageExport;
class vtkTextureObject;
class vtkImplicitHalo;
class vtkSampleFunction;
class vtkShadowMapBakerPass;

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

  //BTX

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

  void ReleaseGraphicsResources(vtkWindow *w);


  vtkGetObjectMacro(ShadowMapBakerPass,vtkShadowMapBakerPass);
  virtual void SetShadowMapBakerPass(
    vtkShadowMapBakerPass *shadowMapBakerPass);


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

 protected:
  vtkShadowMapPass();

  virtual ~vtkShadowMapPass();

  void BuildSpotLightIntensityMap();

  void CheckSupport(vtkOpenGLRenderWindow *w);

  vtkShadowMapBakerPass *ShadowMapBakerPass;
  vtkRenderPass *CompositeRGBAPass;

  vtkRenderPass *OpaquePass;

  vtkFrameBufferObject *FrameBufferObject;

  vtkShadowMapPassTextures *ShadowMaps;
  vtkShadowMapPassLightCameras *LightCameras;
  vtkShaderProgram2 *Program;

  vtkTextureObject *IntensityMap;

  vtkSampleFunction *IntensitySource;
  vtkImageExport *IntensityExporter;
  vtkImplicitHalo *Halo;

  vtkTimeStamp LastRenderTime;

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

#endif