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 // Copyright (c) 2019 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _XCAFDoc_VisMaterial_HeaderFile
 #define _XCAFDoc_VisMaterial_HeaderFile
 
 #include <Graphic3d_AlphaMode.hxx>
 #include <Graphic3d_TypeOfBackfacingModel.hxx>
 #include <TCollection_HAsciiString.hxx>
 #include <TDF_Attribute.hxx>
 #include <XCAFDoc_VisMaterialCommon.hxx>
 #include <XCAFDoc_VisMaterialPBR.hxx>
 
 class Graphic3d_Aspects;
 class Graphic3d_MaterialAspect;
 
 //! Attribute storing Material definition for visualization purposes.
 //!
 //! Visualization material provides extended information about how object should be displayed on the screen
 //! (albedo, metalness, roughness - not just a single color as in case of XCAFDoc_Color).
 //! It is expected to correlate with physical material properties (XCAFDoc_Material), but not necessarily (like painted/polished/rusty object).
 //!
 //! The document defines the list of visualization materials via global attribute XCAFDoc_VisMaterialTool,
 //! while particular material assignment to the shape is done through tree-nodes links.
 //! Therefore, XCAFDoc_VisMaterialTool methods should be used for managing XCAFDoc_VisMaterial attributes.
 //!
 //! Visualization material definition consists of two options: Common and PBR (for Physically Based Rendering).
 //! Common material definition is an obsolete model defined by very first version of OpenGL graphics API
 //! and having specific hardware-accelerated implementation in past (like T&L).
 //! PBR metallic-roughness model is closer to physical material properties, and intended to be used within physically-based renderer.
 //!
 //! For compatibility reasons, this attribute allows defining both material models,
 //! so that it is up-to Data Exchange and Application deciding which one to define and use for rendering (depending on viewer capabilities).
 //! Automatic conversion from one model to another is possible, but lossy (converted material will not look the same).
 //!
 //! Within Data Exchange, different file formats have different capabilities for storing visualization material properties
 //! from simple color (STEP, IGES), to common (OBJ, glTF 1.0) and PBR (glTF 2.0).
 //! This should be taken into account while defining or converting document into one or another format - material definition might be lost or disturbed.
 //!
 //! @sa XCAFDoc_VisMaterialTool
 class XCAFDoc_VisMaterial : public TDF_Attribute
 {
   DEFINE_STANDARD_RTTIEXT(XCAFDoc_VisMaterial, TDF_Attribute)
 public:
 
   //! Return attribute GUID.
   Standard_EXPORT static const Standard_GUID& GetID();
 
 public:
 
   //! Empty constructor.
   Standard_EXPORT XCAFDoc_VisMaterial();
 
   //! Return TRUE if material definition is empty.
   bool IsEmpty() const { return !myPbrMat.IsDefined && !myCommonMat.IsDefined; }
 
   //! Fill in material aspect.
   Standard_EXPORT void FillMaterialAspect (Graphic3d_MaterialAspect& theAspect) const;
 
   //! Fill in graphic aspects.
   Standard_EXPORT void FillAspect (const Handle(Graphic3d_Aspects)& theAspect) const;
 
   //! Return TRUE if metal-roughness PBR material is defined; FALSE by default.
   Standard_Boolean HasPbrMaterial() const { return myPbrMat.IsDefined; }
 
   //! Return metal-roughness PBR material.
   //! Note that default constructor creates an empty material (@sa XCAFDoc_VisMaterialPBR::IsDefined).
   const XCAFDoc_VisMaterialPBR& PbrMaterial() const { return myPbrMat; }
 
   //! Setup metal-roughness PBR material.
   Standard_EXPORT void SetPbrMaterial (const XCAFDoc_VisMaterialPBR& theMaterial);
 
   //! Setup undefined metal-roughness PBR material.
   void UnsetPbrMaterial()
   {
     XCAFDoc_VisMaterialPBR anEmpty;
     anEmpty.IsDefined = false;
     SetPbrMaterial (anEmpty);
   }
 
   //! Return TRUE if common material is defined; FALSE by default.
   Standard_Boolean HasCommonMaterial() const { return myCommonMat.IsDefined; }
 
   //! Return common material.
   //! Note that default constructor creates an empty material (@sa XCAFDoc_VisMaterialCommon::IsDefined).
   const XCAFDoc_VisMaterialCommon& CommonMaterial() const { return myCommonMat; }
 
   //! Setup common material.
   Standard_EXPORT void SetCommonMaterial (const XCAFDoc_VisMaterialCommon& theMaterial);
 
   //! Setup undefined common material.
   void UnsetCommonMaterial()
   {
     XCAFDoc_VisMaterialCommon anEmpty;
     anEmpty.IsDefined = false;
     SetCommonMaterial (anEmpty);
   }
 
   //! Return base color.
   Standard_EXPORT Quantity_ColorRGBA BaseColor() const;
 
   //! Return alpha mode; Graphic3d_AlphaMode_BlendAuto by default.
   Graphic3d_AlphaMode AlphaMode() const { return myAlphaMode; }
 
   //! Return alpha cutoff value; 0.5 by default.
   Standard_ShortReal AlphaCutOff() const { return myAlphaCutOff; }
 
   //! Set alpha mode.
   Standard_EXPORT void SetAlphaMode (Graphic3d_AlphaMode theMode,
                                      Standard_ShortReal  theCutOff = 0.5f);
 
   //! Returns if the material is double or single sided; Graphic3d_TypeOfBackfacingModel_Auto by default.
   Graphic3d_TypeOfBackfacingModel FaceCulling() const { return myFaceCulling; }
 
   //! Specifies whether the material is double or single sided.
   Standard_EXPORT void SetFaceCulling (Graphic3d_TypeOfBackfacingModel theFaceCulling);
 
   Standard_DEPRECATED("Deprecated method, FaceCulling() should be used instead")
   Standard_Boolean IsDoubleSided() const { return myFaceCulling == Graphic3d_TypeOfBackfacingModel_DoubleSided; }
 
   Standard_DEPRECATED("Deprecated method, SetFaceCulling() should be used instead")
   void SetDoubleSided (Standard_Boolean theIsDoubleSided)
   {
     SetFaceCulling (theIsDoubleSided ? Graphic3d_TypeOfBackfacingModel_DoubleSided : Graphic3d_TypeOfBackfacingModel_Auto);
   }
 
   //! Return material name / tag (transient data, not stored in the document).
   const Handle(TCollection_HAsciiString)& RawName() const { return myRawName; }
 
   //! Set material name / tag (transient data, not stored in the document).
   void SetRawName (const Handle(TCollection_HAsciiString)& theName) { myRawName = theName; }
 
   //! Compare two materials.
   //! Performs deep comparison by actual values - e.g. can be useful for merging materials.
   Standard_Boolean IsEqual (const Handle(XCAFDoc_VisMaterial)& theOther) const
   {
     if (theOther.get() == this)
     {
       return true;
     }
     return theOther->myFaceCulling == myFaceCulling
         && theOther->myAlphaCutOff == myAlphaCutOff
         && theOther->myAlphaMode == myAlphaMode
         && theOther->myCommonMat.IsEqual (myCommonMat)
         && theOther->myPbrMat.IsEqual (myPbrMat);
   }
 
   //! Return Common material or convert PBR into Common material.
   Standard_EXPORT XCAFDoc_VisMaterialCommon ConvertToCommonMaterial();
 
   //! Return PBR material or convert Common into PBR material.
   Standard_EXPORT XCAFDoc_VisMaterialPBR ConvertToPbrMaterial();
 
 public: //! @name interface implementation
 
   //! Return GUID of this attribute type.
   virtual const Standard_GUID& ID() const Standard_OVERRIDE { return GetID(); }
 
   //! Restore attribute from specified state.
   //! @param theWith [in] attribute state to restore (copy into this)
   Standard_EXPORT virtual void Restore (const Handle(TDF_Attribute)& theWith) Standard_OVERRIDE;
 
   //! Create a new empty attribute.
   Standard_EXPORT virtual Handle(TDF_Attribute) NewEmpty() const Standard_OVERRIDE;
 
   //! Paste this attribute into another one.
   //! @param theInto [in/out] target attribute to copy this into
   //! @param theRelTable [in] relocation table
   Standard_EXPORT virtual void Paste (const Handle(TDF_Attribute)& theInto,
                                       const Handle(TDF_RelocationTable)& theRelTable) const Standard_OVERRIDE;
   
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
 
 private:
 
   Handle(TCollection_HAsciiString) myRawName;       //!< material name / tag (transient data)
   XCAFDoc_VisMaterialPBR           myPbrMat;        //!< metal-roughness material definition
   XCAFDoc_VisMaterialCommon        myCommonMat;     //!< common material definition
   Graphic3d_AlphaMode              myAlphaMode;     //!< alpha mode; Graphic3d_AlphaMode_BlendAuto by default
   Standard_ShortReal               myAlphaCutOff;   //!< alpha cutoff value; 0.5 by default
   Graphic3d_TypeOfBackfacingModel  myFaceCulling;   //!< specifies whether the material is double/single sided
 
 };
 
 DEFINE_STANDARD_HANDLE(XCAFDoc_VisMaterial, TDF_Attribute)
 
 #endif // _XCAFDoc_VisMaterial_HeaderFile

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