forked from bartvdbraak/blender
e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
116 lines
3.5 KiB
C++
116 lines
3.5 KiB
C++
/*
|
|
* 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/bvh_params.h"
|
|
#include "bvh/bvh_unaligned.h"
|
|
|
|
#include "util/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 /* __BVH_BINNING_H__ */
|