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 // Created on: 2013-10-02
 // Created by: Denis BOGOLEPOV
 // Copyright (c) 2013-2014 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 OpenGl_ShaderStates_HeaderFile
 #define OpenGl_ShaderStates_HeaderFile
 
 #include <Graphic3d_RenderTransparentMethod.hxx>
 #include <Graphic3d_LightSet.hxx>
 #include <OpenGl_Element.hxx>
 #include <OpenGl_Vec.hxx>
 
 class OpenGl_ShadowMapArray;
 
 //! Defines interface for OpenGL state.
 class OpenGl_StateInterface
 {
 public:
 
   //! Creates new state.
   Standard_EXPORT OpenGl_StateInterface();
 
   //! Returns current state index.
   Standard_Size Index() const { return myIndex; }
 
   //! Increment current state.
   void Update() { ++myIndex; }
 
 protected:
 
   Standard_Size myIndex; //!< current state index
 
 };
 
 //! Defines state of OCCT projection transformation.
 class OpenGl_ProjectionState : public OpenGl_StateInterface
 {
 public:
 
   //! Creates uninitialized projection state.
   Standard_EXPORT OpenGl_ProjectionState();
 
   //! Sets new projection matrix.
   Standard_EXPORT void Set (const OpenGl_Mat4& theProjectionMatrix);
 
   //! Returns current projection matrix.
   const OpenGl_Mat4& ProjectionMatrix() const { return myProjectionMatrix; }
 
   //! Returns inverse of current projection matrix.
   Standard_EXPORT const OpenGl_Mat4& ProjectionMatrixInverse() const;
 
 private:
 
   OpenGl_Mat4         myProjectionMatrix;        //!< OCCT projection matrix
   mutable OpenGl_Mat4 myProjectionMatrixInverse; //!< Inverse of OCCT projection matrix
   mutable bool        myInverseNeedUpdate;       //!< Is inversed matrix outdated?
 
 };
 
 //! Defines state of OCCT model-world transformation.
 class OpenGl_ModelWorldState : public OpenGl_StateInterface
 {
 public:
 
   //! Creates uninitialized model-world state.
   Standard_EXPORT OpenGl_ModelWorldState();
 
   //! Sets new model-world matrix.
   Standard_EXPORT void Set (const OpenGl_Mat4& theModelWorldMatrix);
 
   //! Returns current model-world matrix.
   const OpenGl_Mat4& ModelWorldMatrix() const { return myModelWorldMatrix; }
 
   //! Returns inverse of current model-world matrix.
   Standard_EXPORT const OpenGl_Mat4& ModelWorldMatrixInverse() const;
 
 private:
 
   OpenGl_Mat4         myModelWorldMatrix;        //!< OCCT model-world matrix
   mutable OpenGl_Mat4 myModelWorldMatrixInverse; //!< Inverse of OCCT model-world matrix
   mutable bool        myInverseNeedUpdate;       //!< Is inversed matrix outdated?
   
 };
 
 //! Defines state of OCCT world-view transformation.
 class OpenGl_WorldViewState : public OpenGl_StateInterface
 {
 public:
 
   //! Creates uninitialized world-view state.
   Standard_EXPORT OpenGl_WorldViewState();
 
   //! Sets new world-view matrix.
   Standard_EXPORT void Set (const OpenGl_Mat4& theWorldViewMatrix);
 
   //! Returns current world-view matrix.
   const OpenGl_Mat4& WorldViewMatrix() const { return myWorldViewMatrix; }
 
   //! Returns inverse of current world-view matrix.
   Standard_EXPORT const OpenGl_Mat4& WorldViewMatrixInverse() const;
 
 private:
 
   OpenGl_Mat4         myWorldViewMatrix;        //!< OCCT world-view matrix
   mutable OpenGl_Mat4 myWorldViewMatrixInverse; //!< Inverse of OCCT world-view matrix
   mutable bool        myInverseNeedUpdate;      //!< Is inversed matrix outdated?
 
 };
 
 //! Defines state of OCCT light sources.
 class OpenGl_LightSourceState : public OpenGl_StateInterface
 {
 public:
 
   //! Creates uninitialized state of light sources.
   OpenGl_LightSourceState() : mySpecIBLMapLevels (0), myToCastShadows (Standard_True) {}
 
   //! Sets new light sources.
   void Set (const Handle(Graphic3d_LightSet)& theLightSources) { myLightSources = theLightSources; }
 
   //! Returns current list of light sources.
   const Handle(Graphic3d_LightSet)& LightSources() const { return myLightSources; }
 
   //! Returns number of mipmap levels used in specular IBL map.
   //! 0 by default or in case of using non-PBR shading model.
   Standard_Integer SpecIBLMapLevels() const { return mySpecIBLMapLevels; }
 
   //! Sets number of mipmap levels used in specular IBL map.
   void SetSpecIBLMapLevels(Standard_Integer theSpecIBLMapLevels) { mySpecIBLMapLevels = theSpecIBLMapLevels; }
 
   //! Returns TRUE if shadowmap is set.
   bool HasShadowMaps() const { return myToCastShadows && !myShadowMaps.IsNull(); }
 
   //! Returns shadowmap.
   const Handle(OpenGl_ShadowMapArray)& ShadowMaps() const { return myShadowMaps; }
 
   //! Sets shadowmap.
   void SetShadowMaps (const Handle(OpenGl_ShadowMapArray)& theMap) { myShadowMaps = theMap; }
 
   //! Returns TRUE if shadowmap should be enabled when available; TRUE by default.
   bool ToCastShadows() const { return myToCastShadows; }
 
   //! Set if shadowmap should be enabled when available.
   void SetCastShadows (bool theToCast) { myToCastShadows = theToCast; }
 
 private:
 
   Handle(Graphic3d_LightSet) myLightSources;     //!< List of OCCT light sources
   Standard_Integer           mySpecIBLMapLevels; //!< Number of mipmap levels used in specular IBL map (0 by default or in case of using non-PBR shading model)
   Handle(OpenGl_ShadowMapArray) myShadowMaps;    //!< active shadowmap
   Standard_Boolean           myToCastShadows;    //!< enable/disable shadowmap
 
 };
 
 //! Defines generic state of OCCT clipping state.
 class OpenGl_ClippingState
 {
 public:
 
   //! Creates new clipping state.
   Standard_EXPORT OpenGl_ClippingState();
 
   //! Returns current state index.
   Standard_Size Index() const { return myIndex; }
 
   //! Updates current state.
   Standard_EXPORT void Update();
 
   //! Reverts current state.
   Standard_EXPORT void Revert();
 
 protected:
 
   Standard_Size                   myIndex;      //!< Current state index
   Standard_Size                   myNextIndex;  //!< Next    state index
   NCollection_List<Standard_Size> myStateStack; //!< Stack of previous states
 
 };
 
 //! Defines generic state of order-independent transparency rendering properties.
 class OpenGl_OitState : public OpenGl_StateInterface
 {
 public:
 
   //! Creates new uniform state.
   OpenGl_OitState() : myOitMode (Graphic3d_RTM_BLEND_UNORDERED), myDepthFactor (0.5f) {}
 
   //! Sets the uniform values.
   //! @param theToEnableWrite [in] flag indicating whether color and coverage
   //!  values for OIT processing should be written by shader program.
   //! @param theDepthFactor [in] scalar factor [0-1] defining influence of depth
   //!  component of a fragment to its final coverage coefficient.
   void Set (Graphic3d_RenderTransparentMethod theMode,
             const float theDepthFactor)
   {
     myOitMode = theMode;
     myDepthFactor = static_cast<float> (Max (0.f, Min (1.f, theDepthFactor)));
   }
 
   //! Returns flag indicating whether writing of output for OIT processing
   //! should be enabled/disabled.
   Graphic3d_RenderTransparentMethod ActiveMode() const { return myOitMode; }
 
   //! Returns factor defining influence of depth component of a fragment
   //! to its final coverage coefficient.
   float DepthFactor() const { return myDepthFactor; }
 
 private:
 
   Graphic3d_RenderTransparentMethod myOitMode;     //!< active OIT method for the main GLSL program
   float                             myDepthFactor; //!< factor of depth influence to coverage
 };
 
 #endif // _OpenGl_State_HeaderFile

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