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1 | // Created on: 2013-12-25 |
2 | // Created by: Varvara POSKONINA |
3 | // Copyright (c) 1999-2014 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_BVHTreeSelector_HeaderFile |
17 | #define _OpenGl_BVHTreeSelector_HeaderFile |
18 | |
19 | #include <Graphic3d_Camera.hxx> |
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20 | #include <Graphic3d_WorldViewProjState.hxx> |
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21 | #include <OpenGl_Vec.hxx> |
22 | |
23 | //! BVHTreeSelector class provides a possibility to store parameters of view volume, |
24 | //! such as its vertices and equations, and contains methods detecting if given AABB overlaps |
25 | //! view volume. |
26 | class OpenGl_BVHTreeSelector |
27 | { |
28 | public: |
29 | |
30 | //! Creates an empty selector object with parallel projection type by default. |
31 | Standard_EXPORT OpenGl_BVHTreeSelector(); |
32 | |
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33 | //! Retrieves view volume's planes equations and its vertices from projection and world-view matrices. |
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34 | Standard_EXPORT void SetViewVolume (const Handle(Graphic3d_Camera)& theCamera); |
35 | |
36 | //! Detects if AABB overlaps view volume using separating axis theorem (SAT). |
37 | //! @param theMinPt [in] maximum point of AABB. |
38 | //! @param theMaxPt [in] minimum point of AABB. |
39 | //! @return Standard_True, if AABB is in viewing area, Standard_False otherwise. |
40 | Standard_EXPORT Standard_Boolean Intersect (const OpenGl_Vec4& theMinPt, |
41 | const OpenGl_Vec4& theMaxPt) const; |
42 | |
43 | //! Caches view volume's vertices projections along its normals and AABBs dimensions. |
44 | //! Must be called at the beginning of each BVH tree traverse loop. |
45 | Standard_EXPORT void CacheClipPtsProjections(); |
46 | |
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47 | //! Returns current projection matrix. |
48 | const OpenGl_Mat4& ProjectionMatrix() const |
49 | { |
50 | return myProjectionMat; |
51 | } |
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52 | |
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53 | //! Returns current world view transformation matrix. |
54 | const OpenGl_Mat4& WorldViewMatrix() const |
55 | { |
56 | return myWorldViewMat; |
57 | } |
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58 | |
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59 | //! Returns state of current world view projection transformation matrices. |
60 | const Graphic3d_WorldViewProjState& WorldViewProjState() const |
61 | { |
62 | return myWorldViewProjState; |
63 | } |
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64 | |
65 | protected: |
66 | |
67 | //! Calculates signed distance from plane to point. |
68 | //! @param theNormal [in] the plane's normal. |
69 | //! @param thePnt [in] |
70 | Standard_EXPORT Standard_ShortReal SignedPlanePointDistance (const OpenGl_Vec4& theNormal, |
71 | const OpenGl_Vec4& thePnt); |
72 | |
73 | protected: |
74 | |
75 | //! Enumerates planes of view volume. |
76 | enum |
77 | { |
78 | Plane_Top, |
79 | Plane_Bottom, |
80 | Plane_Left, |
81 | Plane_Right, |
82 | Plane_Near, |
83 | Plane_Far, |
84 | PlanesNB |
85 | }; |
86 | |
87 | //! Enumerates vertices of view volume. |
88 | enum |
89 | { |
90 | ClipVert_LeftTopNear, |
91 | ClipVert_LeftBottomNear, |
92 | ClipVert_RightTopNear, |
93 | ClipVert_RightBottomNear, |
94 | ClipVert_LeftTopFar, |
95 | ClipVert_LeftBottomFar, |
96 | ClipVert_RightTopFar, |
97 | ClipVert_RightBottomFar, |
98 | ClipVerticesNB |
99 | }; |
100 | |
101 | protected: |
102 | |
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103 | OpenGl_Vec4 myClipPlanes[PlanesNB]; //!< Plane equations |
104 | OpenGl_Vec4 myClipVerts[ClipVerticesNB]; //!< Vertices |
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105 | |
106 | // for caching clip points projections onto viewing area normals once per traverse |
107 | // ORDER: TOP, BOTTOM, LEFT, RIGHT, NEAR, FAR |
108 | Standard_ShortReal myMaxClipProjectionPts[PlanesNB]; //!< Max view volume's vertices projections onto its normals |
109 | Standard_ShortReal myMinClipProjectionPts[PlanesNB]; //!< Min view volume's vertices projections onto its normals |
110 | |
111 | // for caching clip points projections onto AABB normals once per traverse |
112 | // ORDER: E0, E1, E2 |
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113 | Standard_ShortReal myMaxOrthoProjectionPts[3]; //!< Max view volume's vertices projections onto normalized dimensions of AABB |
114 | Standard_ShortReal myMinOrthoProjectionPts[3]; //!< Min view volume's vertices projections onto normalized dimensions of AABB |
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115 | |
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116 | Standard_Boolean myIsProjectionParallel; |
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117 | |
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118 | OpenGl_Mat4 myProjectionMat; |
119 | OpenGl_Mat4 myWorldViewMat; |
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120 | |
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121 | Graphic3d_WorldViewProjState myWorldViewProjState; //!< State of world view projection matrices. |
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122 | }; |
123 | |
124 | #endif // _OpenGl_BVHTreeSelector_HeaderFile |