vtkShadowMapPass.h

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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 "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkOpenGLRenderPass.h"
#include <vector>  // STL Header
#include <string> // For member variables.

class vtkOpenGLRenderWindow;
class vtkInformationIntegerKey;
class vtkCamera;
class vtkLight;
class vtkFrameBufferObject;
class vtkShadowMapPassTextures; // internal
class vtkShadowMapPassLightCameras; // internal
class vtkShadowMapBakerPass;
class vtkInformationObjectBaseKey;
class vtkShaderProgram;

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

  void Render(const vtkRenderState *s) override;

  void ReleaseGraphicsResources(vtkWindow *w) override;


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


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

  std::vector<double> ShadowMapTransforms() {
    return this->ShadowTransforms; }

  std::vector<int> GetShadowMapTextureUnits() {
    return this->ShadowTextureUnits; }

  static vtkInformationObjectBaseKey *ShadowMapPass();

  std::string GetFragmentDeclaration() {
    return this->FragmentDeclaration; }
  std::string GetFragmentImplementation() {
    return this->FragmentImplementation; }

  // vtkOpenGLRenderPass virtuals:
  bool PreReplaceShaderValues(std::string &vertexShader,
                                   std::string &geometryShader,
                                   std::string &fragmentShader,
                                   vtkAbstractMapper *mapper,
                                   vtkProp *prop) override;
  bool PostReplaceShaderValues(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;

 protected:
  vtkShadowMapPass();

  ~vtkShadowMapPass() override;

  void CheckSupport(vtkOpenGLRenderWindow *w);

  vtkShadowMapBakerPass *ShadowMapBakerPass;
  vtkRenderPass *CompositeRGBAPass;

  vtkRenderPass *OpaqueSequence;

  vtkFrameBufferObject *FrameBufferObject;

  vtkShadowMapPassTextures *ShadowMaps;
  vtkShadowMapPassLightCameras *LightCameras;

  vtkTimeStamp LastRenderTime;

  // to store the shader code and settings
  void BuildShaderCode();
  std::string FragmentDeclaration;
  std::string FragmentImplementation;
  std::vector<int> ShadowTextureUnits;
  std::vector<double> ShadowTransforms;
  std::vector<float> ShadowAttenuation;
  std::vector<int> ShadowParallel;

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

#endif