vtkOpenGLPolyDataMapper.h

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

  Program:   Visualization Toolkit

  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 vtkOpenGLPolyDataMapper_h
#define vtkOpenGLPolyDataMapper_h

#include "vtkNew.h"          // For vtkNew
#include "vtkNew.h"          // for ivars
#include "vtkOpenGLHelper.h" // used for ivars
#include "vtkPolyDataMapper.h"
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkShader.h"                 // for methods
#include "vtkStateStorage.h"           // used for ivars

#include <map>    //for methods
#include <vector> //for ivars

class vtkCellArray;
class vtkGenericOpenGLResourceFreeCallback;
class vtkMatrix4x4;
class vtkMatrix3x3;
class vtkOpenGLCellToVTKCellMap;
class vtkOpenGLRenderTimer;
class vtkOpenGLTexture;
class vtkOpenGLBufferObject;
class vtkOpenGLVertexBufferObject;
class vtkOpenGLVertexBufferObjectGroup;
class vtkPoints;
class vtkTexture;
class vtkTextureObject;
class vtkTransform;
class vtkOpenGLShaderProperty;

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

  void RenderPiece(vtkRenderer* ren, vtkActor* act) override;


  virtual void RenderPieceStart(vtkRenderer* ren, vtkActor* act);
  virtual void RenderPieceDraw(vtkRenderer* ren, vtkActor* act);
  virtual void RenderPieceFinish(vtkRenderer* ren, vtkActor* act);

  void ReleaseGraphicsResources(vtkWindow*) override;

  vtkGetMacro(PopulateSelectionSettings, int);
  void SetPopulateSelectionSettings(int v) { this->PopulateSelectionSettings = v; }

  bool GetSupportsSelection() override { return true; }

  // used by RenderPiece and functions it calls to reduce
  // calls to get the input and allow for rendering of
  // other polydata (not the input)
  vtkPolyData* CurrentInput;


  vtkSetStringMacro(PointIdArrayName);
  vtkGetStringMacro(PointIdArrayName);
  vtkSetStringMacro(CellIdArrayName);
  vtkGetStringMacro(CellIdArrayName);


  vtkSetStringMacro(ProcessIdArrayName);
  vtkGetStringMacro(ProcessIdArrayName);


  vtkSetStringMacro(CompositeIdArrayName);
  vtkGetStringMacro(CompositeIdArrayName);

#ifndef VTK_LEGACY_REMOVE


  VTK_LEGACY(void AddShaderReplacement(vtkShader::Type shaderType, // vertex, fragment, etc
    const std::string& originalValue,
    bool replaceFirst, // do this replacement before the default
    const std::string& replacementValue, bool replaceAll);)
  VTK_LEGACY(void ClearShaderReplacement(vtkShader::Type shaderType, // vertex, fragment, etc
    const std::string& originalValue, bool replaceFirst);)
  VTK_LEGACY(void ClearAllShaderReplacements(vtkShader::Type shaderType);)
  VTK_LEGACY(void ClearAllShaderReplacements();)


  VTK_LEGACY(virtual void SetVertexShaderCode(const char* code);)
  VTK_LEGACY(virtual char* GetVertexShaderCode();)
  VTK_LEGACY(virtual void SetFragmentShaderCode(const char* code);)
  VTK_LEGACY(virtual char* GetFragmentShaderCode();)
  VTK_LEGACY(virtual void SetGeometryShaderCode(const char* code);)
  VTK_LEGACY(virtual char* GetGeometryShaderCode();)
#endif

  void ShallowCopy(vtkAbstractMapper* m) override;

  vtkGetObjectMacro(VBOs, vtkOpenGLVertexBufferObjectGroup);

  void SetVBOShiftScaleMethod(int m);

  enum PrimitiveTypes
  {
    PrimitiveStart = 0,
    PrimitivePoints = 0,
    PrimitiveLines,
    PrimitiveTris,
    PrimitiveTriStrips,
    PrimitiveTrisEdges,
    PrimitiveTriStripsEdges,
    PrimitiveVertices,
    PrimitiveEnd
  };

  void MapDataArrayToVertexAttribute(const char* vertexAttributeName, const char* dataArrayName,
    int fieldAssociation, int componentno = -1) override;

  // This method will Map the specified data array for use as
  // a texture coordinate for texture tname. The actual
  // attribute will be named tname_coord so as to not
  // conflict with the texture sampler definition which will
  // be tname.
  void MapDataArrayToMultiTextureAttribute(const char* tname, const char* dataArrayName,
    int fieldAssociation, int componentno = -1) override;

  void RemoveVertexAttributeMapping(const char* vertexAttributeName) override;

  void RemoveAllVertexAttributeMappings() override;

  void ProcessSelectorPixelBuffers(
    vtkHardwareSelector* sel, std::vector<unsigned int>& pixeloffsets, vtkProp* prop) override;

protected:
  vtkOpenGLPolyDataMapper();
  ~vtkOpenGLPolyDataMapper() override;

  vtkGenericOpenGLResourceFreeCallback* ResourceCallback;

  void MapDataArray(const char* vertexAttributeName, const char* dataArrayName,
    const char* texturename, int fieldAssociation, int componentno);

  // what coordinate should be used for this texture
  std::string GetTextureCoordinateName(const char* tname);

  void GetCoincidentParameters(vtkRenderer* ren, vtkActor* actor, float& factor, float& offset);

  void ComputeBounds() override;

  virtual void UpdateShaders(vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual bool GetNeedToRebuildShaders(vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual void BuildShaders(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);

  virtual void GetShaderTemplate(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);

  virtual void ReplaceShaderValues(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);


  virtual void ReplaceShaderRenderPass(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act, bool prePass);
  virtual void ReplaceShaderCustomUniforms(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkActor* act);
  virtual void ReplaceShaderColor(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderLight(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderTCoord(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderPicking(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderPrimID(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderNormal(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderClip(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderPositionVC(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderCoincidentOffset(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);
  virtual void ReplaceShaderDepth(
    std::map<vtkShader::Type, vtkShader*> shaders, vtkRenderer* ren, vtkActor* act);

  virtual void SetCustomUniforms(vtkOpenGLHelper& cellBO, vtkActor* actor);

  virtual void SetMapperShaderParameters(vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual void SetLightingShaderParameters(
    vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual void SetCameraShaderParameters(vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual void SetPropertyShaderParameters(
    vtkOpenGLHelper& cellBO, vtkRenderer* ren, vtkActor* act);

  virtual void UpdateBufferObjects(vtkRenderer* ren, vtkActor* act);

  virtual bool GetNeedToRebuildBufferObjects(vtkRenderer* ren, vtkActor* act);

  virtual void BuildBufferObjects(vtkRenderer* ren, vtkActor* act);

  virtual void BuildIBO(vtkRenderer* ren, vtkActor* act, vtkPolyData* poly);

  // The VBO and its layout.
  vtkOpenGLVertexBufferObjectGroup* VBOs;

  // Structures for the various cell types we render.
  vtkOpenGLHelper Primitives[PrimitiveEnd];
  vtkOpenGLHelper* LastBoundBO;
  bool DrawingEdgesOrVertices;

  // do we have wide lines that require special handling
  virtual bool HaveWideLines(vtkRenderer*, vtkActor*);

  // do we have textures that require special handling
  virtual bool HaveTextures(vtkActor* actor);

  // how many textures do we have
  virtual unsigned int GetNumberOfTextures(vtkActor* actor);

  // populate a vector with the textures we have
  // the order is always
  //  ColorInternalTexture
  //  Actors texture
  //  Properties textures
  virtual std::vector<std::pair<vtkTexture*, std::string> > GetTextures(vtkActor* actor);

  // do we have textures coordinates that require special handling
  virtual bool HaveTCoords(vtkPolyData* poly);

  // values we use to determine if we need to rebuild shaders
  std::map<const vtkOpenGLHelper*, int> LastLightComplexity;
  std::map<const vtkOpenGLHelper*, int> LastLightCount;
  std::map<const vtkOpenGLHelper*, vtkTimeStamp> LightComplexityChanged;

  int LastSelectionState;
  vtkTimeStamp SelectionStateChanged;

  // Caches the vtkOpenGLRenderPass::RenderPasses() information.
  // Note: Do not dereference the pointers held by this object. There is no
  // guarantee that they are still valid!
  vtkNew<vtkInformation> LastRenderPassInfo;

  // Check the renderpasses in actor's property keys to see if they've changed
  // render stages:
  vtkMTimeType GetRenderPassStageMTime(vtkActor* actor);

  bool UsingScalarColoring;
  vtkTimeStamp VBOBuildTime;     // When was the OpenGL VBO updated?
  vtkStateStorage VBOBuildState; // used for determining when to rebuild the VBO
  vtkStateStorage IBOBuildState; // used for determining whento rebuild the IBOs
  vtkStateStorage CellTextureBuildState;
  vtkStateStorage TempState; // can be used to avoid constant allocs/deallocs
  vtkOpenGLTexture* InternalColorTexture;

  int PopulateSelectionSettings;
  int PrimitiveIDOffset;

  vtkMatrix4x4* TempMatrix4;
  vtkMatrix3x3* TempMatrix3;
  vtkNew<vtkTransform> VBOInverseTransform;
  vtkNew<vtkMatrix4x4> VBOShiftScale;
  int ShiftScaleMethod; // for points

  // if set to true, tcoords will be passed to the
  // VBO even if the mapper knows of no texture maps
  // normally tcoords are only added to the VBO if the
  // mapper has identified a texture map as well.
  bool ForceTextureCoordinates;

  virtual void BuildCellTextures(
    vtkRenderer* ren, vtkActor*, vtkCellArray* prims[4], int representation);

  void AppendCellTextures(vtkRenderer* ren, vtkActor*, vtkCellArray* prims[4], int representation,
    std::vector<unsigned char>& colors, std::vector<float>& normals, vtkPolyData* pd,
    vtkOpenGLCellToVTKCellMap* ccmap);

  vtkTextureObject* CellScalarTexture;
  vtkOpenGLBufferObject* CellScalarBuffer;
  bool HaveCellScalars;
  vtkTextureObject* CellNormalTexture;
  vtkOpenGLBufferObject* CellNormalBuffer;
  bool HaveCellNormals;

  // additional picking indirection
  char* PointIdArrayName;
  char* CellIdArrayName;
  char* ProcessIdArrayName;
  char* CompositeIdArrayName;

  class ExtraAttributeValue
  {
  public:
    std::string DataArrayName;
    int FieldAssociation;
    int ComponentNumber;
    std::string TextureName;
  };
  std::map<std::string, ExtraAttributeValue> ExtraAttributes;

  // Store shader properties on this class by legacy shader replacement functions
  // This should disappear when the functions are deprecated
#ifndef VTK_LEGACY_REMOVE
  vtkOpenGLShaderProperty* GetLegacyShaderProperty();
  vtkSmartPointer<vtkOpenGLShaderProperty> LegacyShaderProperty;
#endif

  vtkOpenGLRenderTimer* TimerQuery;

  // are we currently drawing spheres/tubes
  bool DrawingSpheres(vtkOpenGLHelper& cellBO, vtkActor* actor);
  bool DrawingTubes(vtkOpenGLHelper& cellBO, vtkActor* actor);
  bool DrawingTubesOrSpheres(vtkOpenGLHelper& cellBO, vtkActor* actor);

  // get which opengl mode to use to draw the primitive
  int GetOpenGLMode(int representation, int primType);

  // get how big to make the points when doing point picking
  // typically 2 for points, 4 for lines, 6 for surface
  int GetPointPickingPrimitiveSize(int primType);

  // used to occasionally invoke timers
  unsigned int TimerQueryCounter;

  // stores the mapping from vtk cells to gl_PrimitiveId
  vtkNew<vtkOpenGLCellToVTKCellMap> CellCellMap;

  // compute and set the maximum point and cell ID used in selection
  virtual void UpdateMaximumPointCellIds(vtkRenderer* ren, vtkActor* actor);

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

#endif