vtkShadowMapBakerPass.h

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

  Program:   Visualization Toolkit
  Module:    vtkShadowMapBakerPass.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 "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkSmartPointer.h" // for ivars
#include <vector> // STL Header
#include "vtkOpenGLRenderPass.h"

class vtkOpenGLRenderWindow;
class vtkInformationIntegerKey;
class vtkCamera;
class vtkLight;
class vtkOpenGLFramebufferObject;
class vtkTextureObject;

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

  void Render(const vtkRenderState *s) override;

  void ReleaseGraphicsResources(vtkWindow *w) override;


  vtkGetObjectMacro(OpaqueSequence,vtkRenderPass);
  virtual void SetOpaqueSequence(vtkRenderPass *opaqueSequence);


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


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

  bool GetHasShadows();

  bool LightCreatesShadow(vtkLight *l);

  std::vector<vtkSmartPointer<vtkTextureObject> > *GetShadowMaps();

  std::vector<vtkSmartPointer<vtkCamera> > *GetLightCameras();

  bool GetNeedUpdate();

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

 protected:
  vtkShadowMapBakerPass();

  ~vtkShadowMapBakerPass() override;

  // vtkOpenGLRenderPass virtuals:
  bool PreReplaceShaderValues(std::string &vertexShader,
                                   std::string &geometryShader,
                                   std::string &fragmentShader,
                                   vtkAbstractMapper *mapper,
                                   vtkProp *prop) override;
  bool SetShaderParameters(vtkShaderProgram *program,
                          vtkAbstractMapper *mapper, vtkProp *prop,
                          vtkOpenGLVertexArrayObject* VAO = nullptr) override;

  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);

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

  void CheckSupport(vtkOpenGLRenderWindow *w);

  vtkRenderPass *OpaqueSequence;

  vtkRenderPass *CompositeZPass;

  unsigned int Resolution;

  bool HasShadows;

  vtkOpenGLFramebufferObject *FrameBufferObject;

  std::vector<vtkSmartPointer<vtkTextureObject> > *ShadowMaps;
  std::vector<vtkSmartPointer<vtkCamera> > *LightCameras;


  vtkTimeStamp LastRenderTime;
  bool NeedUpdate;
  size_t CurrentLightIndex;


private:
  vtkShadowMapBakerPass(const vtkShadowMapBakerPass&) = delete;
  void operator=(const vtkShadowMapBakerPass&) = delete;
};

#endif