forked from bartvdbraak/blender
225 lines
7.1 KiB
C++
225 lines
7.1 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.
|
|
*/
|
|
|
|
//#define __KERNEL_SSE__
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include "bvh_binning.h"
|
|
|
|
#include "util_algorithm.h"
|
|
#include "util_boundbox.h"
|
|
#include "util_types.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* SSE replacements */
|
|
|
|
__forceinline void prefetch_L1 (const void* ptr) { }
|
|
__forceinline void prefetch_L2 (const void* ptr) { }
|
|
__forceinline void prefetch_L3 (const void* ptr) { }
|
|
__forceinline void prefetch_NTA(const void* ptr) { }
|
|
|
|
template<size_t src> __forceinline float extract(const int4& b)
|
|
{ return b[src]; }
|
|
template<size_t dst> __forceinline const float4 insert(const float4& a, const float b)
|
|
{ float4 r = a; r[dst] = b; return r; }
|
|
|
|
__forceinline int get_best_dimension(const float4& bestSAH)
|
|
{
|
|
// return (int)__bsf(movemask(reduce_min(bestSAH) == bestSAH));
|
|
|
|
float minSAH = min(bestSAH.x, min(bestSAH.y, bestSAH.z));
|
|
|
|
if(bestSAH.x == minSAH) return 0;
|
|
else if(bestSAH.y == minSAH) return 1;
|
|
else return 2;
|
|
}
|
|
|
|
/* BVH Object Binning */
|
|
|
|
BVHObjectBinning::BVHObjectBinning(const BVHRange& job, BVHReference *prims)
|
|
: BVHRange(job), splitSAH(FLT_MAX), dim(0), pos(0)
|
|
{
|
|
/* compute number of bins to use and precompute scaling factor for binning */
|
|
num_bins = min(size_t(MAX_BINS), size_t(4.0f + 0.05f*size()));
|
|
scale = rcp(cent_bounds().size()) * make_float3((float)num_bins);
|
|
|
|
/* initialize binning counter and bounds */
|
|
BoundBox bin_bounds[MAX_BINS][4]; /* bounds for every bin in every dimension */
|
|
int4 bin_count[MAX_BINS]; /* number of primitives mapped to bin */
|
|
|
|
for(size_t i = 0; i < num_bins; i++) {
|
|
bin_count[i] = make_int4(0);
|
|
bin_bounds[i][0] = bin_bounds[i][1] = bin_bounds[i][2] = BoundBox::empty;
|
|
}
|
|
|
|
/* map geometry to bins, unrolled once */
|
|
{
|
|
ssize_t i;
|
|
|
|
for(i = 0; i < ssize_t(size()) - 1; i += 2) {
|
|
prefetch_L2(&prims[start() + i + 8]);
|
|
|
|
/* map even and odd primitive to bin */
|
|
BVHReference prim0 = prims[start() + i + 0];
|
|
BVHReference prim1 = prims[start() + i + 1];
|
|
|
|
int4 bin0 = get_bin(prim0.bounds());
|
|
int4 bin1 = get_bin(prim1.bounds());
|
|
|
|
/* increase bounds for bins for even primitive */
|
|
int b00 = extract<0>(bin0); bin_count[b00][0]++; bin_bounds[b00][0].grow(prim0.bounds());
|
|
int b01 = extract<1>(bin0); bin_count[b01][1]++; bin_bounds[b01][1].grow(prim0.bounds());
|
|
int b02 = extract<2>(bin0); bin_count[b02][2]++; bin_bounds[b02][2].grow(prim0.bounds());
|
|
|
|
/* increase bounds of bins for odd primitive */
|
|
int b10 = extract<0>(bin1); bin_count[b10][0]++; bin_bounds[b10][0].grow(prim1.bounds());
|
|
int b11 = extract<1>(bin1); bin_count[b11][1]++; bin_bounds[b11][1].grow(prim1.bounds());
|
|
int b12 = extract<2>(bin1); bin_count[b12][2]++; bin_bounds[b12][2].grow(prim1.bounds());
|
|
}
|
|
|
|
/* for uneven number of primitives */
|
|
if(i < ssize_t(size())) {
|
|
/* map primitive to bin */
|
|
BVHReference prim0 = prims[start() + i];
|
|
int4 bin0 = get_bin(prim0.bounds());
|
|
|
|
/* increase bounds of bins */
|
|
int b00 = extract<0>(bin0); bin_count[b00][0]++; bin_bounds[b00][0].grow(prim0.bounds());
|
|
int b01 = extract<1>(bin0); bin_count[b01][1]++; bin_bounds[b01][1].grow(prim0.bounds());
|
|
int b02 = extract<2>(bin0); bin_count[b02][2]++; bin_bounds[b02][2].grow(prim0.bounds());
|
|
}
|
|
}
|
|
|
|
/* sweep from right to left and compute parallel prefix of merged bounds */
|
|
float4 r_area[MAX_BINS]; /* area of bounds of primitives on the right */
|
|
float4 r_count[MAX_BINS]; /* number of primitives on the right */
|
|
int4 count = make_int4(0);
|
|
|
|
BoundBox bx = BoundBox::empty;
|
|
BoundBox by = BoundBox::empty;
|
|
BoundBox bz = BoundBox::empty;
|
|
|
|
for(size_t i = num_bins - 1; i > 0; i--) {
|
|
count = count + bin_count[i];
|
|
r_count[i] = blocks(count);
|
|
|
|
bx = merge(bx,bin_bounds[i][0]); r_area[i][0] = bx.half_area();
|
|
by = merge(by,bin_bounds[i][1]); r_area[i][1] = by.half_area();
|
|
bz = merge(bz,bin_bounds[i][2]); r_area[i][2] = bz.half_area();
|
|
r_area[i][3] = r_area[i][2];
|
|
}
|
|
|
|
/* sweep from left to right and compute SAH */
|
|
int4 ii = make_int4(1);
|
|
float4 bestSAH = make_float4(FLT_MAX);
|
|
int4 bestSplit = make_int4(-1);
|
|
|
|
count = make_int4(0);
|
|
|
|
bx = BoundBox::empty;
|
|
by = BoundBox::empty;
|
|
bz = BoundBox::empty;
|
|
|
|
for(size_t i = 1; i < num_bins; i++, ii += make_int4(1)) {
|
|
count = count + bin_count[i-1];
|
|
|
|
bx = merge(bx,bin_bounds[i-1][0]); float Ax = bx.half_area();
|
|
by = merge(by,bin_bounds[i-1][1]); float Ay = by.half_area();
|
|
bz = merge(bz,bin_bounds[i-1][2]); float Az = bz.half_area();
|
|
|
|
float4 lCount = blocks(count);
|
|
float4 lArea = make_float4(Ax,Ay,Az,Az);
|
|
float4 sah = lArea*lCount + r_area[i]*r_count[i];
|
|
|
|
bestSplit = select(sah < bestSAH,ii,bestSplit);
|
|
bestSAH = min(sah,bestSAH);
|
|
}
|
|
|
|
int4 mask = float3_to_float4(cent_bounds().size()) <= make_float4(0.0f);
|
|
bestSAH = insert<3>(select(mask, make_float4(FLT_MAX), bestSAH), FLT_MAX);
|
|
|
|
/* find best dimension */
|
|
dim = get_best_dimension(bestSAH);
|
|
splitSAH = bestSAH[dim];
|
|
pos = bestSplit[dim];
|
|
leafSAH = bounds().half_area() * blocks(size());
|
|
}
|
|
|
|
void BVHObjectBinning::split(BVHReference* prims, BVHObjectBinning& left_o, BVHObjectBinning& right_o) const
|
|
{
|
|
size_t N = size();
|
|
|
|
BoundBox lgeom_bounds = BoundBox::empty;
|
|
BoundBox rgeom_bounds = BoundBox::empty;
|
|
BoundBox lcent_bounds = BoundBox::empty;
|
|
BoundBox rcent_bounds = BoundBox::empty;
|
|
|
|
ssize_t l = 0, r = N-1;
|
|
|
|
while(l <= r) {
|
|
prefetch_L2(&prims[start() + l + 8]);
|
|
prefetch_L2(&prims[start() + r - 8]);
|
|
|
|
BVHReference prim = prims[start() + l];
|
|
float3 center = prim.bounds().center2();
|
|
|
|
if(get_bin(center)[dim] < pos) {
|
|
lgeom_bounds.grow(prim.bounds());
|
|
lcent_bounds.grow(center);
|
|
l++;
|
|
}
|
|
else {
|
|
rgeom_bounds.grow(prim.bounds());
|
|
rcent_bounds.grow(center);
|
|
swap(prims[start()+l],prims[start()+r]);
|
|
r--;
|
|
}
|
|
}
|
|
|
|
/* finish */
|
|
if(l != 0 && N-1-r != 0) {
|
|
right_o = BVHObjectBinning(BVHRange(rgeom_bounds, rcent_bounds, start() + l, N-1-r), prims);
|
|
left_o = BVHObjectBinning(BVHRange(lgeom_bounds, lcent_bounds, start(), l), prims);
|
|
return;
|
|
}
|
|
|
|
/* object medium split if we did not make progress, can happen when all
|
|
primitives have same centroid */
|
|
lgeom_bounds = BoundBox::empty;
|
|
rgeom_bounds = BoundBox::empty;
|
|
lcent_bounds = BoundBox::empty;
|
|
rcent_bounds = BoundBox::empty;
|
|
|
|
for(size_t i = 0; i < N/2; i++) {
|
|
lgeom_bounds.grow(prims[start()+i].bounds());
|
|
lcent_bounds.grow(prims[start()+i].bounds().center2());
|
|
}
|
|
|
|
for(size_t i = N/2; i < N; i++) {
|
|
rgeom_bounds.grow(prims[start()+i].bounds());
|
|
rcent_bounds.grow(prims[start()+i].bounds().center2());
|
|
}
|
|
|
|
right_o = BVHObjectBinning(BVHRange(rgeom_bounds, rcent_bounds, start() + N/2, N/2 + N%2), prims);
|
|
left_o = BVHObjectBinning(BVHRange(lgeom_bounds, lcent_bounds, start(), N/2), prims);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|
|
|