vtkSSAOPass.h

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/*=========================================================================
 
  Program:   Visualization Toolkit
  Module:    vtkSSAOPass.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 vtkSSAOPass_h
#define vtkSSAOPass_h
 
#include "vtkImageProcessingPass.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
 
#include <vector> // For vector
 
class vtkMatrix4x4;
class vtkOpenGLFramebufferObject;
class vtkOpenGLQuadHelper;
class vtkTextureObject;
 
class VTKRENDERINGOPENGL2_EXPORT vtkSSAOPass : public vtkImageProcessingPass
{
public:
  static vtkSSAOPass* New();
  vtkTypeMacro(vtkSSAOPass, vtkImageProcessingPass);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  void Render(const vtkRenderState* s) override;
 
  void ReleaseGraphicsResources(vtkWindow* w) override;
 
  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;
 
 
  vtkGetMacro(Radius, double);
  vtkSetMacro(Radius, double);
 
 
  vtkGetMacro(KernelSize, unsigned int);
  vtkSetClampMacro(KernelSize, unsigned int, 1, 1000);
 
 
  vtkGetMacro(Bias, double);
  vtkSetMacro(Bias, double);
 
 
  vtkGetMacro(Blur, bool);
  vtkSetMacro(Blur, bool);
  vtkBooleanMacro(Blur, bool);
 
protected:
  vtkSSAOPass() = default;
  ~vtkSSAOPass() override = default;
 
  void ComputeKernel();
  void InitializeGraphicsResources(vtkOpenGLRenderWindow* renWin, int w, int h);
 
  void RenderDelegate(const vtkRenderState* s, int w, int h);
  void RenderSSAO(vtkOpenGLRenderWindow* renWin, vtkMatrix4x4* projection, int w, int h);
  void RenderCombine(vtkOpenGLRenderWindow* renWin);
 
  vtkTextureObject* ColorTexture = nullptr;
  vtkTextureObject* PositionTexture = nullptr;
  vtkTextureObject* NormalTexture = nullptr;
  vtkTextureObject* SSAOTexture = nullptr;
  vtkTextureObject* DepthTexture = nullptr;
 
  vtkOpenGLFramebufferObject* FrameBufferObject = nullptr;
 
  vtkOpenGLQuadHelper* SSAOQuadHelper = nullptr;
  vtkOpenGLQuadHelper* CombineQuadHelper = nullptr;
 
  std::vector<float> Kernel;
  unsigned int KernelSize = 32;
  double Radius = 0.5;
  double Bias = 0.01;
  bool Blur = false;
 
private:
  vtkSSAOPass(const vtkSSAOPass&) = delete;
  void operator=(const vtkSSAOPass&) = delete;
};
 
#endif