/usr/include/bullet/BulletCollision/Gimpact/gim_clip_polygon.h is in libbullet-dev 2.87+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | #ifndef GIM_CLIP_POLYGON_H_INCLUDED
#define GIM_CLIP_POLYGON_H_INCLUDED
/*! \file gim_tri_collision.h
\author Francisco Leon Najera
*/
/*
-----------------------------------------------------------------------------
This source file is part of GIMPACT Library.
For the latest info, see http://gimpact.sourceforge.net/
Copyright (c) 2006 Francisco Leon Najera. C.C. 80087371.
email: projectileman@yahoo.com
This library is free software; you can redistribute it and/or
modify it under the terms of EITHER:
(1) The GNU Lesser General Public License as published by the Free
Software Foundation; either version 2.1 of the License, or (at
your option) any later version. The text of the GNU Lesser
General Public License is included with this library in the
file GIMPACT-LICENSE-LGPL.TXT.
(2) The BSD-style license that is included with this library in
the file GIMPACT-LICENSE-BSD.TXT.
(3) The zlib/libpng license that is included with this library in
the file GIMPACT-LICENSE-ZLIB.TXT.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the files
GIMPACT-LICENSE-LGPL.TXT, GIMPACT-LICENSE-ZLIB.TXT and GIMPACT-LICENSE-BSD.TXT for more details.
-----------------------------------------------------------------------------
*/
//! This function calcs the distance from a 3D plane
class DISTANCE_PLANE_3D_FUNC
{
public:
template<typename CLASS_POINT,typename CLASS_PLANE>
inline GREAL operator()(const CLASS_PLANE & plane, const CLASS_POINT & point)
{
return DISTANCE_PLANE_POINT(plane, point);
}
};
template<typename CLASS_POINT>
SIMD_FORCE_INLINE void PLANE_CLIP_POLYGON_COLLECT(
const CLASS_POINT & point0,
const CLASS_POINT & point1,
GREAL dist0,
GREAL dist1,
CLASS_POINT * clipped,
GUINT & clipped_count)
{
GUINT _prevclassif = (dist0>G_EPSILON);
GUINT _classif = (dist1>G_EPSILON);
if(_classif!=_prevclassif)
{
GREAL blendfactor = -dist0/(dist1-dist0);
VEC_BLEND(clipped[clipped_count],point0,point1,blendfactor);
clipped_count++;
}
if(!_classif)
{
VEC_COPY(clipped[clipped_count],point1);
clipped_count++;
}
}
//! Clips a polygon by a plane
/*!
*\return The count of the clipped counts
*/
template<typename CLASS_POINT,typename CLASS_PLANE, typename DISTANCE_PLANE_FUNC>
SIMD_FORCE_INLINE GUINT PLANE_CLIP_POLYGON_GENERIC(
const CLASS_PLANE & plane,
const CLASS_POINT * polygon_points,
GUINT polygon_point_count,
CLASS_POINT * clipped,DISTANCE_PLANE_FUNC distance_func)
{
GUINT clipped_count = 0;
//clip first point
GREAL firstdist = distance_func(plane,polygon_points[0]);;
if(!(firstdist>G_EPSILON))
{
VEC_COPY(clipped[clipped_count],polygon_points[0]);
clipped_count++;
}
GREAL olddist = firstdist;
for(GUINT _i=1;_i<polygon_point_count;_i++)
{
GREAL dist = distance_func(plane,polygon_points[_i]);
PLANE_CLIP_POLYGON_COLLECT(
polygon_points[_i-1],polygon_points[_i],
olddist,
dist,
clipped,
clipped_count);
olddist = dist;
}
//RETURN TO FIRST point
PLANE_CLIP_POLYGON_COLLECT(
polygon_points[polygon_point_count-1],polygon_points[0],
olddist,
firstdist,
clipped,
clipped_count);
return clipped_count;
}
//! Clips a polygon by a plane
/*!
*\return The count of the clipped counts
*/
template<typename CLASS_POINT,typename CLASS_PLANE, typename DISTANCE_PLANE_FUNC>
SIMD_FORCE_INLINE GUINT PLANE_CLIP_TRIANGLE_GENERIC(
const CLASS_PLANE & plane,
const CLASS_POINT & point0,
const CLASS_POINT & point1,
const CLASS_POINT & point2,
CLASS_POINT * clipped,DISTANCE_PLANE_FUNC distance_func)
{
GUINT clipped_count = 0;
//clip first point
GREAL firstdist = distance_func(plane,point0);;
if(!(firstdist>G_EPSILON))
{
VEC_COPY(clipped[clipped_count],point0);
clipped_count++;
}
// point 1
GREAL olddist = firstdist;
GREAL dist = distance_func(plane,point1);
PLANE_CLIP_POLYGON_COLLECT(
point0,point1,
olddist,
dist,
clipped,
clipped_count);
olddist = dist;
// point 2
dist = distance_func(plane,point2);
PLANE_CLIP_POLYGON_COLLECT(
point1,point2,
olddist,
dist,
clipped,
clipped_count);
olddist = dist;
//RETURN TO FIRST point
PLANE_CLIP_POLYGON_COLLECT(
point2,point0,
olddist,
firstdist,
clipped,
clipped_count);
return clipped_count;
}
template<typename CLASS_POINT,typename CLASS_PLANE>
SIMD_FORCE_INLINE GUINT PLANE_CLIP_POLYGON3D(
const CLASS_PLANE & plane,
const CLASS_POINT * polygon_points,
GUINT polygon_point_count,
CLASS_POINT * clipped)
{
return PLANE_CLIP_POLYGON_GENERIC<CLASS_POINT,CLASS_PLANE>(plane,polygon_points,polygon_point_count,clipped,DISTANCE_PLANE_3D_FUNC());
}
template<typename CLASS_POINT,typename CLASS_PLANE>
SIMD_FORCE_INLINE GUINT PLANE_CLIP_TRIANGLE3D(
const CLASS_PLANE & plane,
const CLASS_POINT & point0,
const CLASS_POINT & point1,
const CLASS_POINT & point2,
CLASS_POINT * clipped)
{
return PLANE_CLIP_TRIANGLE_GENERIC<CLASS_POINT,CLASS_PLANE>(plane,point0,point1,point2,clipped,DISTANCE_PLANE_3D_FUNC());
}
#endif // GIM_TRI_COLLISION_H_INCLUDED
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