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 // Copyright (c) 2025 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 _GeomGridEval_BSplineSurface_HeaderFile
 #define _GeomGridEval_BSplineSurface_HeaderFile
 
 #include <BSplSLib_Cache.hxx>
 #include <Geom_BSplineSurface.hxx>
 #include <GeomGridEval.hxx>
 #include <NCollection_Array1.hxx>
 #include <NCollection_Array2.hxx>
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 
 //! @brief Efficient batch evaluator for B-spline surface points.
 //!
 //! Stateless evaluator - constructor takes geometry, parameters passed to methods.
 //!
 //! Optimizes evaluation by:
 //! - Pre-computing span indices for U and V parameters separately (O(aNbU + aNbV))
 //! - Grouping evaluation by (USpan, VSpan) for cache-optimal iteration
 //! - Rebuilding cache only once per span group (not per point)
 //! - Writing results directly to 2D output grid (no intermediate buffers)
 //!
 //! Usage:
 //! @code
 //!   GeomGridEval_BSplineSurface anEvaluator(myBSplineSurface);
 //!   NCollection_Array2<gp_Pnt> aGrid = anEvaluator.EvaluateGrid(myUParams, myVParams);
 //! @endcode
 class GeomGridEval_BSplineSurface
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Constructor with geometry.
   //! @param theSurface the B-spline surface to evaluate
   GeomGridEval_BSplineSurface(const occ::handle<Geom_BSplineSurface>& theSurface)
       : myGeom(theSurface)
   {
   }
 
   //! Non-copyable and non-movable.
   GeomGridEval_BSplineSurface(const GeomGridEval_BSplineSurface&)            = delete;
   GeomGridEval_BSplineSurface& operator=(const GeomGridEval_BSplineSurface&) = delete;
   GeomGridEval_BSplineSurface(GeomGridEval_BSplineSurface&&)                 = delete;
   GeomGridEval_BSplineSurface& operator=(GeomGridEval_BSplineSurface&&)      = delete;
 
   //! Returns the geometry handle.
   const occ::handle<Geom_BSplineSurface>& Geometry() const { return myGeom; }
 
   //! Evaluate grid points at Cartesian product of U and V parameters.
   //! Points are evaluated in span-grouped order to minimize cache rebuilds.
   //! @param theUParams array of U parameter values
   //! @param theVParams array of V parameter values
   //! @return 2D array of evaluated points (1-based indexing),
   //!         or empty array if geometry is null or parameters empty
   Standard_EXPORT NCollection_Array2<gp_Pnt> EvaluateGrid(
     const NCollection_Array1<double>& theUParams,
     const NCollection_Array1<double>& theVParams) const;
 
   //! Evaluate grid points with first partial derivatives.
   //! @param theUParams array of U parameter values
   //! @param theVParams array of V parameter values
   //! @return 2D array of SurfD1 (1-based indexing),
   //!         or empty array if geometry is null or parameters empty
   Standard_EXPORT NCollection_Array2<GeomGridEval::SurfD1> EvaluateGridD1(
     const NCollection_Array1<double>& theUParams,
     const NCollection_Array1<double>& theVParams) const;
 
   //! Evaluate grid points with first and second partial derivatives.
   //! @param theUParams array of U parameter values
   //! @param theVParams array of V parameter values
   //! @return 2D array of SurfD2 (1-based indexing),
   //!         or empty array if geometry is null or parameters empty
   Standard_EXPORT NCollection_Array2<GeomGridEval::SurfD2> EvaluateGridD2(
     const NCollection_Array1<double>& theUParams,
     const NCollection_Array1<double>& theVParams) const;
 
   //! Evaluate grid points with derivatives up to third order.
   //! Uses direct BSplSLib::D3 evaluation (no caching for D3).
   //! @param theUParams array of U parameter values
   //! @param theVParams array of V parameter values
   //! @return 2D array of SurfD3 (1-based indexing),
   //!         or empty array if geometry is null or parameters empty
   Standard_EXPORT NCollection_Array2<GeomGridEval::SurfD3> EvaluateGridD3(
     const NCollection_Array1<double>& theUParams,
     const NCollection_Array1<double>& theVParams) const;
 
   //! Evaluate partial derivative d^(NU+NV)S/(dU^NU dV^NV) at all grid points.
   //! For orders > degree in either direction, returns zero.
   //! Uses direct geometry DN method.
   //! @param theUParams array of U parameter values
   //! @param theVParams array of V parameter values
   //! @param theNU derivative order in U direction
   //! @param theNV derivative order in V direction
   //! @return 2D array of derivative vectors (1-based indexing)
   Standard_EXPORT NCollection_Array2<gp_Vec> EvaluateGridDN(
     const NCollection_Array1<double>& theUParams,
     const NCollection_Array1<double>& theVParams,
     int                               theNU,
     int                               theNV) const;
 
 private:
   occ::handle<Geom_BSplineSurface> myGeom;
 };
 
 #endif // _GeomGridEval_BSplineSurface_HeaderFile

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