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
|
/*
* Adapted from code copyright 2009-2011 Intel Corporation
* Modifications Copyright 2012, Blender Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __BVH_BINNING_H__
#define __BVH_BINNING_H__
#include "bvh_params.h"
#include "bvh_unaligned.h"
#include "util_types.h"
CCL_NAMESPACE_BEGIN
class BVHBuild;
/* Single threaded object binner. Finds the split with the best SAH heuristic
* by testing for each dimension multiple partitionings for regular spaced
* partition locations. A partitioning for a partition location is computed,
* by putting primitives whose centroid is on the left and right of the split
* location to different sets. The SAH is evaluated by computing the number of
* blocks occupied by the primitives in the partitions. */
class BVHObjectBinning : public BVHRange
{
public:
__forceinline BVHObjectBinning() : leafSAH(FLT_MAX) {}
BVHObjectBinning(const BVHRange& job,
BVHReference *prims,
const BVHUnaligned *unaligned_heuristic = NULL,
const Transform *aligned_space = NULL);
void split(BVHReference *prims,
BVHObjectBinning& left_o,
BVHObjectBinning& right_o) const;
__forceinline const BoundBox& unaligned_bounds() { return bounds_; }
float splitSAH; /* SAH cost of the best split */
float leafSAH; /* SAH cost of creating a leaf */
protected:
int dim; /* best split dimension */
int pos; /* best split position */
size_t num_bins; /* actual number of bins to use */
float3 scale; /* scaling factor to compute bin */
/* Effective bounds and centroid bounds. */
BoundBox bounds_;
BoundBox cent_bounds_;
const BVHUnaligned *unaligned_heuristic_;
const Transform *aligned_space_;
enum { MAX_BINS = 32 };
enum { LOG_BLOCK_SIZE = 2 };
/* computes the bin numbers for each dimension for a box. */
__forceinline int4 get_bin(const BoundBox& box) const
{
int4 a = make_int4((box.center2() - cent_bounds_.min)*scale - make_float3(0.5f));
int4 mn = make_int4(0);
int4 mx = make_int4((int)num_bins-1);
return clamp(a, mn, mx);
}
/* computes the bin numbers for each dimension for a point. */
__forceinline int4 get_bin(const float3& c) const
{
return make_int4((c - cent_bounds_.min)*scale - make_float3(0.5f));
}
/* compute the number of blocks occupied for each dimension. */
__forceinline float4 blocks(const int4& a) const
{
return make_float4((a + make_int4((1 << LOG_BLOCK_SIZE)-1)) >> LOG_BLOCK_SIZE);
}
/* compute the number of blocks occupied in one dimension. */
__forceinline int blocks(size_t a) const
{
return (int)((a+((1LL << LOG_BLOCK_SIZE)-1)) >> LOG_BLOCK_SIZE);
}
__forceinline BoundBox get_prim_bounds(const BVHReference& prim) const
{
if(aligned_space_ == NULL) {
return prim.bounds();
}
else {
return unaligned_heuristic_->compute_aligned_prim_boundbox(
prim, *aligned_space_);
}
}
};
CCL_NAMESPACE_END
#endif
|
