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1 | // Created on: 2014-10-15 |
| 2 | // Created by: Denis Bogolepov |
| 3 | // Copyright (c) 2014 OPEN CASCADE SAS |
| 4 | // |
| 5 | // This file is part of Open CASCADE Technology software library. |
| 6 | // |
| 7 | // This library is free software; you can redistribute it and/or modify it under |
| 8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
| 9 | // by the Free Software Foundation, with special exception defined in the file |
| 10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
| 11 | // distribution for complete text of the license and disclaimer of any warranty. |
| 12 | // |
| 13 | // Alternatively, this file may be used under the terms of Open CASCADE |
| 14 | // commercial license or contractual agreement. |
| 15 | |
| 16 | #ifndef OpenGl_Quadric_Header |
| 17 | #define OpenGl_Quadric_Header |
| 18 | |
| 19 | #include <OpenGl_PrimitiveArray.hxx> |
| 20 | |
| 21 | //! Class for rendering of arbitrary primitive array. |
| 22 | //! Tool class for generating tessellation of quadric surface. |
| 23 | class OpenGl_Quadric : public OpenGl_PrimitiveArray |
| 24 | { |
| 25 | public: |
| 26 | |
| 27 | //! Creates undefined abstract quadric surface |
| 28 | Standard_EXPORT OpenGl_Quadric(); |
| 29 | |
| 30 | //! Returns true if quadric has been defined |
| 31 | Standard_Boolean IsDefined() const { return myNbSlices != 0; } |
| 32 | |
| 33 | //! Returns number of slices |
| 34 | Standard_Integer NbSlices() const { return myNbSlices; } |
| 35 | |
| 36 | //! Returns number of stacks |
| 37 | Standard_Integer NbStacks() const { return myNbStacks; } |
| 38 | |
| 39 | //! Returns total number of vertices |
| 40 | Standard_Integer NbVertices() const { return (myNbSlices + 1) * (myNbStacks + 1); } |
| 41 | |
| 42 | //! Returns total number of triangles |
| 43 | Standard_Integer NbTriangles() const { return myNbSlices * myNbStacks * 2; } |
| 44 | |
| 45 | //! Release GL resources |
| 46 | virtual void Release (OpenGl_Context* theContext) Standard_OVERRIDE; |
| 47 | |
| 48 | protected: |
| 49 | |
| 50 | //! Returns surface point for the given parameters. |
| 51 | virtual OpenGl_Vec3 evalVertex (const Standard_ShortReal theU, |
| 52 | const Standard_ShortReal theV) const = 0; |
| 53 | |
| 54 | //! Returns surface normal for the given parameters. |
| 55 | virtual OpenGl_Vec3 evalNormal (const Standard_ShortReal theU, |
| 56 | const Standard_ShortReal theV) const = 0; |
| 57 | |
| 58 | //! Initialize primitive. |
| 59 | Standard_EXPORT Standard_Boolean init (const Standard_Integer theNbSlices, |
| 60 | const Standard_Integer theNbStacks); |
| 61 | |
| 62 | private: |
| 63 | |
| 64 | //! Initialize arrays. |
| 65 | Standard_Boolean createArrays() const; |
| 66 | |
| 67 | private: |
| 68 | |
| 69 | Standard_Integer myNbSlices; //!< Number of slices (u partitions) |
| 70 | Standard_Integer myNbStacks; //!< Number of stacks (v partitions) |
| 71 | |
| 72 | }; |
| 73 | |
| 74 | #endif // OpenGl_Quadric_Header |
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