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
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
|
/*
Copyright (c) 2003-2006 Gino van den Bergen / Erwin Coumans http://continuousphysics.com/Bullet/
This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it freely,
subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#ifndef BT_AABB_UTIL2
#define BT_AABB_UTIL2
#include "btTransform.h"
#include "btVector3.h"
#include "btMinMax.h"
SIMD_FORCE_INLINE void AabbExpand (btVector3& aabbMin,
btVector3& aabbMax,
const btVector3& expansionMin,
const btVector3& expansionMax)
{
aabbMin = aabbMin + expansionMin;
aabbMax = aabbMax + expansionMax;
}
/// conservative test for overlap between two aabbs
SIMD_FORCE_INLINE bool TestPointAgainstAabb2(const btVector3 &aabbMin1, const btVector3 &aabbMax1,
const btVector3 &point)
{
bool overlap = true;
overlap = (aabbMin1.getX() > point.getX() || aabbMax1.getX() < point.getX()) ? false : overlap;
overlap = (aabbMin1.getZ() > point.getZ() || aabbMax1.getZ() < point.getZ()) ? false : overlap;
overlap = (aabbMin1.getY() > point.getY() || aabbMax1.getY() < point.getY()) ? false : overlap;
return overlap;
}
/// conservative test for overlap between two aabbs
SIMD_FORCE_INLINE bool TestAabbAgainstAabb2(const btVector3 &aabbMin1, const btVector3 &aabbMax1,
const btVector3 &aabbMin2, const btVector3 &aabbMax2)
{
bool overlap = true;
overlap = (aabbMin1.getX() > aabbMax2.getX() || aabbMax1.getX() < aabbMin2.getX()) ? false : overlap;
overlap = (aabbMin1.getZ() > aabbMax2.getZ() || aabbMax1.getZ() < aabbMin2.getZ()) ? false : overlap;
overlap = (aabbMin1.getY() > aabbMax2.getY() || aabbMax1.getY() < aabbMin2.getY()) ? false : overlap;
return overlap;
}
/// conservative test for overlap between triangle and aabb
SIMD_FORCE_INLINE bool TestTriangleAgainstAabb2(const btVector3 *vertices,
const btVector3 &aabbMin, const btVector3 &aabbMax)
{
const btVector3 &p1 = vertices[0];
const btVector3 &p2 = vertices[1];
const btVector3 &p3 = vertices[2];
if (btMin(btMin(p1[0], p2[0]), p3[0]) > aabbMax[0]) return false;
if (btMax(btMax(p1[0], p2[0]), p3[0]) < aabbMin[0]) return false;
if (btMin(btMin(p1[2], p2[2]), p3[2]) > aabbMax[2]) return false;
if (btMax(btMax(p1[2], p2[2]), p3[2]) < aabbMin[2]) return false;
if (btMin(btMin(p1[1], p2[1]), p3[1]) > aabbMax[1]) return false;
if (btMax(btMax(p1[1], p2[1]), p3[1]) < aabbMin[1]) return false;
return true;
}
SIMD_FORCE_INLINE int btOutcode(const btVector3& p,const btVector3& halfExtent)
{
return (p.getX() < -halfExtent.getX() ? 0x01 : 0x0) |
(p.getX() > halfExtent.getX() ? 0x08 : 0x0) |
(p.getY() < -halfExtent.getY() ? 0x02 : 0x0) |
(p.getY() > halfExtent.getY() ? 0x10 : 0x0) |
(p.getZ() < -halfExtent.getZ() ? 0x4 : 0x0) |
(p.getZ() > halfExtent.getZ() ? 0x20 : 0x0);
}
SIMD_FORCE_INLINE bool btRayAabb2(const btVector3& rayFrom,
const btVector3& rayInvDirection,
const unsigned int raySign[3],
const btVector3 bounds[2],
btScalar& tmin,
btScalar lambda_min,
btScalar lambda_max)
{
btScalar tmax, tymin, tymax, tzmin, tzmax;
tmin = (bounds[raySign[0]].getX() - rayFrom.getX()) * rayInvDirection.getX();
tmax = (bounds[1-raySign[0]].getX() - rayFrom.getX()) * rayInvDirection.getX();
tymin = (bounds[raySign[1]].getY() - rayFrom.getY()) * rayInvDirection.getY();
tymax = (bounds[1-raySign[1]].getY() - rayFrom.getY()) * rayInvDirection.getY();
if ( (tmin > tymax) || (tymin > tmax) )
return false;
if (tymin > tmin)
tmin = tymin;
if (tymax < tmax)
tmax = tymax;
tzmin = (bounds[raySign[2]].getZ() - rayFrom.getZ()) * rayInvDirection.getZ();
tzmax = (bounds[1-raySign[2]].getZ() - rayFrom.getZ()) * rayInvDirection.getZ();
if ( (tmin > tzmax) || (tzmin > tmax) )
return false;
if (tzmin > tmin)
tmin = tzmin;
if (tzmax < tmax)
tmax = tzmax;
return ( (tmin < lambda_max) && (tmax > lambda_min) );
}
SIMD_FORCE_INLINE bool btRayAabb(const btVector3& rayFrom,
const btVector3& rayTo,
const btVector3& aabbMin,
const btVector3& aabbMax,
btScalar& param, btVector3& normal)
{
btVector3 aabbHalfExtent = (aabbMax-aabbMin)* btScalar(0.5);
btVector3 aabbCenter = (aabbMax+aabbMin)* btScalar(0.5);
btVector3 source = rayFrom - aabbCenter;
btVector3 target = rayTo - aabbCenter;
int sourceOutcode = btOutcode(source,aabbHalfExtent);
int targetOutcode = btOutcode(target,aabbHalfExtent);
if ((sourceOutcode & targetOutcode) == 0x0)
{
btScalar lambda_enter = btScalar(0.0);
btScalar lambda_exit = param;
btVector3 r = target - source;
int i;
btScalar normSign = 1;
btVector3 hitNormal(0,0,0);
int bit=1;
for (int j=0;j<2;j++)
{
for (i = 0; i != 3; ++i)
{
if (sourceOutcode & bit)
{
btScalar lambda = (-source[i] - aabbHalfExtent[i]*normSign) / r[i];
if (lambda_enter <= lambda)
{
lambda_enter = lambda;
hitNormal.setValue(0,0,0);
hitNormal[i] = normSign;
}
}
else if (targetOutcode & bit)
{
btScalar lambda = (-source[i] - aabbHalfExtent[i]*normSign) / r[i];
btSetMin(lambda_exit, lambda);
}
bit<<=1;
}
normSign = btScalar(-1.);
}
if (lambda_enter <= lambda_exit)
{
param = lambda_enter;
normal = hitNormal;
return true;
}
}
return false;
}
SIMD_FORCE_INLINE void btTransformAabb(const btVector3& halfExtents, btScalar margin,const btTransform& t,btVector3& aabbMinOut,btVector3& aabbMaxOut)
{
btVector3 halfExtentsWithMargin = halfExtents+btVector3(margin,margin,margin);
btMatrix3x3 abs_b = t.getBasis().absolute();
btVector3 center = t.getOrigin();
btVector3 extent = halfExtentsWithMargin.dot3( abs_b[0], abs_b[1], abs_b[2] );
aabbMinOut = center - extent;
aabbMaxOut = center + extent;
}
SIMD_FORCE_INLINE void btTransformAabb(const btVector3& localAabbMin,const btVector3& localAabbMax, btScalar margin,const btTransform& trans,btVector3& aabbMinOut,btVector3& aabbMaxOut)
{
btAssert(localAabbMin.getX() <= localAabbMax.getX());
btAssert(localAabbMin.getY() <= localAabbMax.getY());
btAssert(localAabbMin.getZ() <= localAabbMax.getZ());
btVector3 localHalfExtents = btScalar(0.5)*(localAabbMax-localAabbMin);
localHalfExtents+=btVector3(margin,margin,margin);
btVector3 localCenter = btScalar(0.5)*(localAabbMax+localAabbMin);
btMatrix3x3 abs_b = trans.getBasis().absolute();
btVector3 center = trans(localCenter);
btVector3 extent = localHalfExtents.dot3( abs_b[0], abs_b[1], abs_b[2] );
aabbMinOut = center-extent;
aabbMaxOut = center+extent;
}
#define USE_BANCHLESS 1
#ifdef USE_BANCHLESS
//This block replaces the block below and uses no branches, and replaces the 8 bit return with a 32 bit return for improved performance (~3x on XBox 360)
SIMD_FORCE_INLINE unsigned testQuantizedAabbAgainstQuantizedAabb(const unsigned short int* aabbMin1,const unsigned short int* aabbMax1,const unsigned short int* aabbMin2,const unsigned short int* aabbMax2)
{
return static_cast<unsigned int>(btSelect((unsigned)((aabbMin1[0] <= aabbMax2[0]) & (aabbMax1[0] >= aabbMin2[0])
& (aabbMin1[2] <= aabbMax2[2]) & (aabbMax1[2] >= aabbMin2[2])
& (aabbMin1[1] <= aabbMax2[1]) & (aabbMax1[1] >= aabbMin2[1])),
1, 0));
}
#else
SIMD_FORCE_INLINE bool testQuantizedAabbAgainstQuantizedAabb(const unsigned short int* aabbMin1,const unsigned short int* aabbMax1,const unsigned short int* aabbMin2,const unsigned short int* aabbMax2)
{
bool overlap = true;
overlap = (aabbMin1[0] > aabbMax2[0] || aabbMax1[0] < aabbMin2[0]) ? false : overlap;
overlap = (aabbMin1[2] > aabbMax2[2] || aabbMax1[2] < aabbMin2[2]) ? false : overlap;
overlap = (aabbMin1[1] > aabbMax2[1] || aabbMax1[1] < aabbMin2[1]) ? false : overlap;
return overlap;
}
#endif //USE_BANCHLESS
#endif //BT_AABB_UTIL2
|