[1963] | 1 | #ifndef GIM_CLIP_POLYGON_H_INCLUDED |
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| 2 | #define GIM_CLIP_POLYGON_H_INCLUDED |
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| 3 | |
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| 4 | /*! \file gim_tri_collision.h |
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| 5 | \author Francisco Len Nßjera |
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| 6 | */ |
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| 7 | /* |
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| 8 | ----------------------------------------------------------------------------- |
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| 9 | This source file is part of GIMPACT Library. |
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| 10 | |
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| 11 | For the latest info, see http://gimpact.sourceforge.net/ |
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| 12 | |
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| 13 | Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371. |
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| 14 | email: projectileman@yahoo.com |
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| 15 | |
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| 16 | This library is free software; you can redistribute it and/or |
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| 17 | modify it under the terms of EITHER: |
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| 18 | (1) The GNU Lesser General Public License as published by the Free |
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| 19 | Software Foundation; either version 2.1 of the License, or (at |
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| 20 | your option) any later version. The text of the GNU Lesser |
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| 21 | General Public License is included with this library in the |
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| 22 | file GIMPACT-LICENSE-LGPL.TXT. |
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| 23 | (2) The BSD-style license that is included with this library in |
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| 24 | the file GIMPACT-LICENSE-BSD.TXT. |
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| 25 | (3) The zlib/libpng license that is included with this library in |
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| 26 | the file GIMPACT-LICENSE-ZLIB.TXT. |
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| 27 | |
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| 28 | This library is distributed in the hope that it will be useful, |
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| 29 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 30 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files |
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| 31 | GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details. |
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| 32 | |
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| 33 | ----------------------------------------------------------------------------- |
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| 34 | */ |
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| 35 | |
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| 36 | /*! \addtogroup GEOMETRIC_OPERATIONS |
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| 37 | */ |
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| 38 | //! @{ |
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| 39 | |
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| 40 | //! This function calcs the distance from a 3D plane |
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| 41 | class DISTANCE_PLANE_3D_FUNC |
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| 42 | { |
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| 43 | public: |
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| 44 | template<typename CLASS_POINT,typename CLASS_PLANE> |
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| 45 | inline GREAL operator()(const CLASS_PLANE & plane, const CLASS_POINT & point) |
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| 46 | { |
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| 47 | return DISTANCE_PLANE_POINT(plane, point); |
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| 48 | } |
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| 49 | }; |
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| 50 | |
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| 51 | |
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| 52 | |
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| 53 | template<typename CLASS_POINT> |
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| 54 | SIMD_FORCE_INLINE void PLANE_CLIP_POLYGON_COLLECT( |
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| 55 | const CLASS_POINT & point0, |
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| 56 | const CLASS_POINT & point1, |
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| 57 | GREAL dist0, |
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| 58 | GREAL dist1, |
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| 59 | CLASS_POINT * clipped, |
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| 60 | GUINT & clipped_count) |
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| 61 | { |
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| 62 | GUINT _prevclassif = (dist0>G_EPSILON); |
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| 63 | GUINT _classif = (dist1>G_EPSILON); |
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| 64 | if(_classif!=_prevclassif) |
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| 65 | { |
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| 66 | GREAL blendfactor = -dist0/(dist1-dist0); |
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| 67 | VEC_BLEND(clipped[clipped_count],point0,point1,blendfactor); |
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| 68 | clipped_count++; |
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| 69 | } |
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| 70 | if(!_classif) |
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| 71 | { |
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| 72 | VEC_COPY(clipped[clipped_count],point1); |
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| 73 | clipped_count++; |
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| 74 | } |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | //! Clips a polygon by a plane |
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| 79 | /*! |
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| 80 | *\return The count of the clipped counts |
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| 81 | */ |
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| 82 | template<typename CLASS_POINT,typename CLASS_PLANE, typename DISTANCE_PLANE_FUNC> |
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| 83 | SIMD_FORCE_INLINE GUINT PLANE_CLIP_POLYGON_GENERIC( |
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| 84 | const CLASS_PLANE & plane, |
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| 85 | const CLASS_POINT * polygon_points, |
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| 86 | GUINT polygon_point_count, |
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| 87 | CLASS_POINT * clipped,DISTANCE_PLANE_FUNC distance_func) |
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| 88 | { |
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| 89 | GUINT clipped_count = 0; |
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| 90 | |
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| 91 | |
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| 92 | //clip first point |
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| 93 | GREAL firstdist = distance_func(plane,polygon_points[0]);; |
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| 94 | if(!(firstdist>G_EPSILON)) |
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| 95 | { |
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| 96 | VEC_COPY(clipped[clipped_count],polygon_points[0]); |
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| 97 | clipped_count++; |
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| 98 | } |
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| 99 | |
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| 100 | GREAL olddist = firstdist; |
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| 101 | for(GUINT _i=1;_i<polygon_point_count;_i++) |
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| 102 | { |
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| 103 | GREAL dist = distance_func(plane,polygon_points[_i]); |
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| 104 | |
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| 105 | PLANE_CLIP_POLYGON_COLLECT( |
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| 106 | polygon_points[_i-1],polygon_points[_i], |
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| 107 | olddist, |
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| 108 | dist, |
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| 109 | clipped, |
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| 110 | clipped_count); |
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| 111 | |
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| 112 | |
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| 113 | olddist = dist; |
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| 114 | } |
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| 115 | |
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| 116 | //RETURN TO FIRST point |
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| 117 | |
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| 118 | PLANE_CLIP_POLYGON_COLLECT( |
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| 119 | polygon_points[polygon_point_count-1],polygon_points[0], |
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| 120 | olddist, |
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| 121 | firstdist, |
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| 122 | clipped, |
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| 123 | clipped_count); |
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| 124 | |
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| 125 | return clipped_count; |
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| 126 | } |
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| 127 | |
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| 128 | //! Clips a polygon by a plane |
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| 129 | /*! |
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| 130 | *\return The count of the clipped counts |
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| 131 | */ |
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| 132 | template<typename CLASS_POINT,typename CLASS_PLANE, typename DISTANCE_PLANE_FUNC> |
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| 133 | SIMD_FORCE_INLINE GUINT PLANE_CLIP_TRIANGLE_GENERIC( |
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| 134 | const CLASS_PLANE & plane, |
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| 135 | const CLASS_POINT & point0, |
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| 136 | const CLASS_POINT & point1, |
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| 137 | const CLASS_POINT & point2, |
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| 138 | CLASS_POINT * clipped,DISTANCE_PLANE_FUNC distance_func) |
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| 139 | { |
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| 140 | GUINT clipped_count = 0; |
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| 141 | |
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| 142 | //clip first point |
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| 143 | GREAL firstdist = distance_func(plane,point0);; |
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| 144 | if(!(firstdist>G_EPSILON)) |
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| 145 | { |
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| 146 | VEC_COPY(clipped[clipped_count],point0); |
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| 147 | clipped_count++; |
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| 148 | } |
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| 149 | |
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| 150 | // point 1 |
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| 151 | GREAL olddist = firstdist; |
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| 152 | GREAL dist = distance_func(plane,point1); |
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| 153 | |
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| 154 | PLANE_CLIP_POLYGON_COLLECT( |
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| 155 | point0,point1, |
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| 156 | olddist, |
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| 157 | dist, |
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| 158 | clipped, |
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| 159 | clipped_count); |
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| 160 | |
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| 161 | olddist = dist; |
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| 162 | |
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| 163 | |
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| 164 | // point 2 |
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| 165 | dist = distance_func(plane,point2); |
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| 166 | |
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| 167 | PLANE_CLIP_POLYGON_COLLECT( |
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| 168 | point1,point2, |
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| 169 | olddist, |
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| 170 | dist, |
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| 171 | clipped, |
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| 172 | clipped_count); |
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| 173 | olddist = dist; |
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| 174 | |
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| 175 | |
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| 176 | |
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| 177 | //RETURN TO FIRST point |
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| 178 | PLANE_CLIP_POLYGON_COLLECT( |
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| 179 | point2,point0, |
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| 180 | olddist, |
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| 181 | firstdist, |
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| 182 | clipped, |
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| 183 | clipped_count); |
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| 184 | |
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| 185 | return clipped_count; |
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| 186 | } |
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| 187 | |
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| 188 | |
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| 189 | template<typename CLASS_POINT,typename CLASS_PLANE> |
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| 190 | SIMD_FORCE_INLINE GUINT PLANE_CLIP_POLYGON3D( |
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| 191 | const CLASS_PLANE & plane, |
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| 192 | const CLASS_POINT * polygon_points, |
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| 193 | GUINT polygon_point_count, |
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| 194 | CLASS_POINT * clipped) |
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| 195 | { |
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| 196 | return PLANE_CLIP_POLYGON_GENERIC<CLASS_POINT,CLASS_PLANE>(plane,polygon_points,polygon_point_count,clipped,DISTANCE_PLANE_3D_FUNC()); |
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| 197 | } |
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| 198 | |
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| 199 | |
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| 200 | template<typename CLASS_POINT,typename CLASS_PLANE> |
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| 201 | SIMD_FORCE_INLINE GUINT PLANE_CLIP_TRIANGLE3D( |
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| 202 | const CLASS_PLANE & plane, |
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| 203 | const CLASS_POINT & point0, |
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| 204 | const CLASS_POINT & point1, |
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| 205 | const CLASS_POINT & point2, |
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| 206 | CLASS_POINT * clipped) |
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| 207 | { |
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| 208 | return PLANE_CLIP_TRIANGLE_GENERIC<CLASS_POINT,CLASS_PLANE>(plane,point0,point1,point2,clipped,DISTANCE_PLANE_3D_FUNC()); |
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| 209 | } |
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| 210 | |
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| 211 | |
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| 212 | //! @} |
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| 213 | |
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| 214 | #endif // GIM_TRI_COLLISION_H_INCLUDED |
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