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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 | |
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36 | Standard_EXPORT void SetViewportSize (const Standard_Integer theViewportWidth, const Standard_Integer theViewportHeight); |
37 | |
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38 | //! Detects if AABB overlaps view volume using separating axis theorem (SAT). |
39 | //! @param theMinPt [in] maximum point of AABB. |
40 | //! @param theMaxPt [in] minimum point of AABB. |
41 | //! @return Standard_True, if AABB is in viewing area, Standard_False otherwise. |
42 | Standard_EXPORT Standard_Boolean Intersect (const OpenGl_Vec4& theMinPt, |
43 | const OpenGl_Vec4& theMaxPt) const; |
44 | |
45 | //! Caches view volume's vertices projections along its normals and AABBs dimensions. |
46 | //! Must be called at the beginning of each BVH tree traverse loop. |
47 | Standard_EXPORT void CacheClipPtsProjections(); |
48 | |
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49 | //! Returns current projection matrix. |
50 | const OpenGl_Mat4& ProjectionMatrix() const |
51 | { |
52 | return myProjectionMat; |
53 | } |
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54 | |
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55 | //! Returns current world view transformation matrix. |
56 | const OpenGl_Mat4& WorldViewMatrix() const |
57 | { |
58 | return myWorldViewMat; |
59 | } |
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60 | |
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61 | Standard_Integer ViewportWidth() const |
62 | { |
63 | return myViewportWidth; |
64 | } |
65 | |
66 | Standard_Integer ViewportHeight() const |
67 | { |
68 | return myViewportHeight; |
69 | } |
70 | |
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71 | //! Returns state of current world view projection transformation matrices. |
72 | const Graphic3d_WorldViewProjState& WorldViewProjState() const |
73 | { |
74 | return myWorldViewProjState; |
75 | } |
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76 | |
77 | protected: |
78 | |
79 | //! Calculates signed distance from plane to point. |
80 | //! @param theNormal [in] the plane's normal. |
81 | //! @param thePnt [in] |
82 | Standard_EXPORT Standard_ShortReal SignedPlanePointDistance (const OpenGl_Vec4& theNormal, |
83 | const OpenGl_Vec4& thePnt); |
84 | |
85 | protected: |
86 | |
87 | //! Enumerates planes of view volume. |
88 | enum |
89 | { |
90 | Plane_Top, |
91 | Plane_Bottom, |
92 | Plane_Left, |
93 | Plane_Right, |
94 | Plane_Near, |
95 | Plane_Far, |
96 | PlanesNB |
97 | }; |
98 | |
99 | //! Enumerates vertices of view volume. |
100 | enum |
101 | { |
102 | ClipVert_LeftTopNear, |
103 | ClipVert_LeftBottomNear, |
104 | ClipVert_RightTopNear, |
105 | ClipVert_RightBottomNear, |
106 | ClipVert_LeftTopFar, |
107 | ClipVert_LeftBottomFar, |
108 | ClipVert_RightTopFar, |
109 | ClipVert_RightBottomFar, |
110 | ClipVerticesNB |
111 | }; |
112 | |
113 | protected: |
114 | |
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115 | OpenGl_Vec4 myClipPlanes[PlanesNB]; //!< Plane equations |
116 | OpenGl_Vec4 myClipVerts[ClipVerticesNB]; //!< Vertices |
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117 | |
118 | // for caching clip points projections onto viewing area normals once per traverse |
119 | // ORDER: TOP, BOTTOM, LEFT, RIGHT, NEAR, FAR |
120 | Standard_ShortReal myMaxClipProjectionPts[PlanesNB]; //!< Max view volume's vertices projections onto its normals |
121 | Standard_ShortReal myMinClipProjectionPts[PlanesNB]; //!< Min view volume's vertices projections onto its normals |
122 | |
123 | // for caching clip points projections onto AABB normals once per traverse |
124 | // ORDER: E0, E1, E2 |
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125 | Standard_ShortReal myMaxOrthoProjectionPts[3]; //!< Max view volume's vertices projections onto normalized dimensions of AABB |
126 | Standard_ShortReal myMinOrthoProjectionPts[3]; //!< Min view volume's vertices projections onto normalized dimensions of AABB |
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127 | |
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128 | Standard_Boolean myIsProjectionParallel; |
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129 | |
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130 | OpenGl_Mat4 myProjectionMat; |
131 | OpenGl_Mat4 myWorldViewMat; |
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132 | |
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133 | Standard_Integer myViewportWidth; |
134 | Standard_Integer myViewportHeight; |
135 | |
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136 | Graphic3d_WorldViewProjState myWorldViewProjState; //!< State of world view projection matrices. |
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137 | }; |
138 | |
139 | #endif // _OpenGl_BVHTreeSelector_HeaderFile |