vtkOpenGLPolyDataMapper.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkOpenGLPolyDataMapper_h
#define vtkOpenGLPolyDataMapper_h
 
#include "vtkInformation.h"  // for prim struct
#include "vtkNew.h"          // For vtkNew
#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 "vtkWrappingHints.h"          // For VTK_MARSHALAUTO
 
#include <map>    // for map
#include <tuple>  // for tuple
#include <vector> // for vector
 
VTK_ABI_NAMESPACE_BEGIN
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 VTK_MARSHALAUTO vtkOpenGLPolyDataMapper : public vtkPolyDataMapper
{
public:
  static vtkOpenGLPolyDataMapper* New();
  vtkTypeMacro(vtkOpenGLPolyDataMapper, vtkPolyDataMapper);
  void PrintSelf(ostream& os, vtkIndent indent) override;

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

  MapperHashType GenerateHash(vtkPolyData* polydata) 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;
 
  VTK_MARSHALEXCLUDE(VTK_MARSHAL_EXCLUDE_REASON_IS_INTERNAL)
  vtkGetMacro(PopulateSelectionSettings, int);
  VTK_MARSHALEXCLUDE(VTK_MARSHAL_EXCLUDE_REASON_IS_INTERNAL)
  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;

  void ShallowCopy(vtkAbstractMapper* m) override;

  vtkGetObjectMacro(VBOs, vtkOpenGLVertexBufferObjectGroup);

  void SetVBOShiftScaleMethod(int method) override;

  vtkGetMacro(UseProgramPointSize, bool);
  vtkSetMacro(UseProgramPointSize, bool);
  vtkBooleanMacro(UseProgramPointSize, bool);
 
  enum PrimitiveTypes
  {
    PrimitiveStart = 0,
    PrimitivePoints = 0,
    PrimitiveLines,
    PrimitiveTris,
    PrimitiveTriStrips,
    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);
 
  // handle updating shift scale based on pose changes
  virtual void UpdateCameraShiftScale(vtkRenderer* ren, vtkActor* actor);

  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 ReplaceShaderEdges(
    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);

  virtual void BuildSelectionIBO(
    vtkPolyData* poly, std::vector<unsigned int> (&indices)[4], vtkIdType offset);

  virtual void BuildSelectionCache(const char* arrayName, bool selectingPoints, vtkPolyData* poly);
 
  // The VBO and its layout.
  vtkOpenGLVertexBufferObjectGroup* VBOs;
 
  // Structures for the various cell types we render.
  vtkOpenGLHelper Primitives[PrimitiveEnd];
  vtkOpenGLHelper SelectionPrimitives[PrimitiveEnd];
  vtkOpenGLHelper* LastBoundBO;
  bool DrawingVertices;
  bool DrawingSelection = false;
  int SelectionType;
  vtkMTimeType SelectionTime = 0;
 
  std::map<std::tuple<unsigned int, unsigned int, vtkIdType>, std::vector<vtkIdType>>
    SelectionCache;
  std::string SelectionCacheName;
  bool SelectionCacheForPoints = false;
  vtkMTimeType SelectionCacheTime = 0;
  vtkPolyData* SelectionPolyData = nullptr;
 
  // 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
  typedef std::pair<vtkTexture*, std::string> texinfo;
  virtual std::vector<texinfo> 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
  // stored in a map keyed on the vtkOpenGLHelper, so one
  // typically entry per type of primitive we render which
  // matches the shader programs we use
  class primitiveInfo
  {
  public:
    enum LightingTypeEnum
    {
      NoLighting = 0,
      Headlight = 1,
      Directional = 2,
      Positional = 3
    };
    LightingTypeEnum LastLightComplexity = NoLighting;
 
    int LastLightCount;
 
    vtkTimeStamp LightComplexityChanged;
 
    // 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;
  };
  std::map<const vtkOpenGLHelper*, primitiveInfo> PrimitiveInfo;
 
  bool PointPicking;
  int LastSelectionState;
  vtkTimeStamp SelectionStateChanged;
 
  // Check the renderpasses in actor's property keys to see if they've changed
  // render stages:
  vtkMTimeType GetRenderPassStageMTime(vtkActor* actor, const vtkOpenGLHelper* cellBO);
 
  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;
  vtkIdType PrimitiveIDOffset;
 
  vtkMatrix4x4* TempMatrix4;
  vtkMatrix3x3* TempMatrix3;
  vtkNew<vtkTransform> VBOInverseTransform;
  vtkNew<vtkMatrix4x4> VBOShiftScale;
  bool UseProgramPointSize;
 
  // 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;
 
  vtkTextureObject* EdgeTexture;
  vtkOpenGLBufferObject* EdgeBuffer;
  std::vector<unsigned char> EdgeValues;
  virtual bool DrawingEdges(vtkRenderer*, vtkActor*);
 
  class ExtraAttributeValue
  {
  public:
    std::string DataArrayName;
    int FieldAssociation;
    int ComponentNumber;
    std::string TextureName;
  };
  std::map<std::string, ExtraAttributeValue> ExtraAttributes;
 
  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 OpenGL primitives IDs (gl_PrimitiveId) to VTK cells IDs
  vtkNew<vtkOpenGLCellToVTKCellMap> CellCellMap;
 
  // compute and set the maximum point and cell ID used in selection
  virtual void UpdateMaximumPointCellIds(vtkRenderer* ren, vtkActor* actor);
 
  virtual void AddPointIdsToSelectionPrimitives(vtkPolyData* poly, const char* arrayName,
    unsigned int processId, unsigned int compositeIndex, vtkIdType selectedId);
  virtual void AddCellIdsToSelectionPrimitives(vtkPolyData* poly, const char* arrayName,
    unsigned int processId, unsigned int compositeIndex, vtkIdType selectedId);
 
  vtkNew<vtkCellArray> SelectionArrays[4];
 
  vtkMTimeType EnvironmentTextureTime = 0;
  vtkTexture* EnvironmentTexture = nullptr;
 
private:
  vtkOpenGLPolyDataMapper(const vtkOpenGLPolyDataMapper&) = delete;
  void operator=(const vtkOpenGLPolyDataMapper&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif