vtkValuePass.h

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

  Program:   Visualization Toolkit
  Module:    vtkValuePass.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 vtkValuePass_h
#define vtkValuePass_h

#include "vtkOpenGLRenderPass.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkSmartPointer.h" //for ivar

class vtkAbstractArray;
class vtkActor;
class vtkDataArray;
class vtkDataObject;
class vtkFloatArray;
class vtkMapper;
class vtkOpenGLVertexArrayObject;
class vtkProperty;
class vtkRenderer;
class vtkRenderWindow;
class vtkShaderProgram;

class VTKRENDERINGOPENGL2_EXPORT vtkValuePass : public vtkOpenGLRenderPass
{
public:

  enum Mode
  {
    INVERTIBLE_LUT = 1,
    FLOATING_POINT = 2
  };

  static vtkValuePass *New();
  vtkTypeMacro(vtkValuePass, vtkOpenGLRenderPass);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkSetMacro(RenderingMode, int);
  vtkGetMacro(RenderingMode, int);
  void SetInputArrayToProcess(int fieldAssociation, const char *name);
  void SetInputArrayToProcess(int fieldAssociation, int fieldId);
  void SetInputComponentToProcess(int component);
  void SetScalarRange(double min, double max);

  void Render(const vtkRenderState *s) override;

  vtkFloatArray* GetFloatImageDataArray(vtkRenderer* ren);

  void GetFloatImageData(int const format, int const width, int const height,
    void* data);

  int* GetFloatImageExtents();

  bool IsFloatingPointModeSupported();

  void ReleaseGraphicsResources(vtkWindow *win) override;

  void ColorToValue(unsigned char const* color, double const min, double const scale,
    double& value);

 protected:
  vtkValuePass();
  ~vtkValuePass() 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;
  vtkMTimeType GetShaderStageMTime() override;

  void BeginPass(vtkRenderer* ren);

  void EndPass();

  void RenderOpaqueGeometry(const vtkRenderState *s);

  void RenderPieceFinish();

  void RenderPieceStart(vtkDataArray* dataArr, vtkMapper *m);

  void BeginMapperRender(vtkMapper* mapper, vtkDataArray* dataArray,
    vtkProperty* property);

  void EndMapperRender(vtkMapper* mapper, vtkProperty* property);

  void InitializeBuffers(vtkRenderer* ren);

  bool UpdateShaders(std::string& VSSource, std::string& FSSource);

  void BindAttributes(vtkShaderProgram* prog, vtkOpenGLVertexArrayObject* VAO);
  void BindUniforms(vtkShaderProgram* prog);


  bool HasWindowSizeChanged(vtkRenderer* ren);
  bool InitializeFBO(vtkRenderer* ren);
  void ReleaseFBO(vtkWindow* win);

  class vtkInternalsFloat;
  vtkInternalsFloat* ImplFloat;

  class vtkInternalsInvertible;
  vtkInternalsInvertible* ImplInv;

  struct Parameters;
  Parameters* PassState;

  int RenderingMode;

 private:
  vtkDataArray* GetCurrentArray(vtkMapper* mapper, Parameters* arrayPar);

  vtkAbstractArray* GetArrayFromCompositeData(vtkMapper* mapper,
    Parameters* arrayPar);

  vtkSmartPointer<vtkAbstractArray> MultiBlocksArray;

  void PopulateCellCellMap(const vtkRenderState *s);

  vtkValuePass(const vtkValuePass&) = delete;
  void operator=(const vtkValuePass&) = delete;
};

#endif