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++ // Copyright 2009-2021 Intel Corporation
++ // SPDX-License-Identifier: Apache-2.0
++
++ #include "bvh_refit.h"
++ #include "bvh_statistics.h"
++
++ #include "../geometry/linei.h"
++ #include "../geometry/triangle.h"
++ #include "../geometry/trianglev.h"
++ #include "../geometry/trianglei.h"
++ #include "../geometry/quadv.h"
++ #include "../geometry/object.h"
++ #include "../geometry/instance.h"
++
++ namespace embree
++ {
++ namespace isa
++ {
++ static const size_t SINGLE_THREAD_THRESHOLD = 4*1024;
++
++ template<int N>
++ __forceinline bool compare(const typename BVHN<N>::NodeRef* a, const typename BVHN<N>::NodeRef* b)
++ {
++ size_t sa = *(size_t*)&a->node()->lower_x;
++ size_t sb = *(size_t*)&b->node()->lower_x;
++ return sa < sb;
++ }
++
++ template<int N>
++ BVHNRefitter<N>::BVHNRefitter (BVH* bvh, const LeafBoundsInterface& leafBounds)
++ : bvh(bvh), leafBounds(leafBounds), numSubTrees(0)
++ {
++ }
++
++ template<int N>
++ void BVHNRefitter<N>::refit()
++ {
++ if (bvh->numPrimitives <= SINGLE_THREAD_THRESHOLD) {
++ bvh->bounds = LBBox3fa(recurse_bottom(bvh->root));
++ }
++ else
++ {
++ BBox3fa subTreeBounds[MAX_NUM_SUB_TREES];
++ numSubTrees = 0;
++ gather_subtree_refs(bvh->root,numSubTrees,0);
++ if (numSubTrees)
++ parallel_for(size_t(0), numSubTrees, size_t(1), [&](const range<size_t>& r) {
++ for (size_t i=r.begin(); i<r.end(); i++) {
++ NodeRef& ref = subTrees[i];
++ subTreeBounds[i] = recurse_bottom(ref);
++ }
++ });
++
++ numSubTrees = 0;
++ bvh->bounds = LBBox3fa(refit_toplevel(bvh->root,numSubTrees,subTreeBounds,0));
++ }
++ }
++
++ template<int N>
++ void BVHNRefitter<N>::gather_subtree_refs(NodeRef& ref,
++ size_t &subtrees,
++ const size_t depth)
++ {
++ if (depth >= MAX_SUB_TREE_EXTRACTION_DEPTH)
++ {
++ assert(subtrees < MAX_NUM_SUB_TREES);
++ subTrees[subtrees++] = ref;
++ return;
++ }
++
++ if (ref.isAABBNode())
++ {
++ AABBNode* node = ref.getAABBNode();
++ for (size_t i=0; i<N; i++) {
++ NodeRef& child = node->child(i);
++ if (unlikely(child == BVH::emptyNode)) continue;
++ gather_subtree_refs(child,subtrees,depth+1);
++ }
++ }
++ }
++
++ template<int N>
++ BBox3fa BVHNRefitter<N>::refit_toplevel(NodeRef& ref,
++ size_t &subtrees,
++ const BBox3fa *const subTreeBounds,
++ const size_t depth)
++ {
++ if (depth >= MAX_SUB_TREE_EXTRACTION_DEPTH)
++ {
++ assert(subtrees < MAX_NUM_SUB_TREES);
++ assert(subTrees[subtrees] == ref);
++ return subTreeBounds[subtrees++];
++ }
++
++ if (ref.isAABBNode())
++ {
++ AABBNode* node = ref.getAABBNode();
++ BBox3fa bounds[N];
++
++ for (size_t i=0; i<N; i++)
++ {
++ NodeRef& child = node->child(i);
++
++ if (unlikely(child == BVH::emptyNode))
++ bounds[i] = BBox3fa(empty);
++ else
++ bounds[i] = refit_toplevel(child,subtrees,subTreeBounds,depth+1);
++ }
++
++ BBox3vf<N> boundsT = transpose<N>(bounds);
++
++ /* set new bounds */
++ node->lower_x = boundsT.lower.x;
++ node->lower_y = boundsT.lower.y;
++ node->lower_z = boundsT.lower.z;
++ node->upper_x = boundsT.upper.x;
++ node->upper_y = boundsT.upper.y;
++ node->upper_z = boundsT.upper.z;
++
++ return merge<N>(bounds);
++ }
++ else
++ return leafBounds.leafBounds(ref);
++ }
++
++ // =========================================================
++ // =========================================================
++ // =========================================================
++
++
++ template<int N>
++ BBox3fa BVHNRefitter<N>::recurse_bottom(NodeRef& ref)
++ {
++ /* this is a leaf node */
++ if (unlikely(ref.isLeaf()))
++ return leafBounds.leafBounds(ref);
++
++ /* recurse if this is an internal node */
++ AABBNode* node = ref.getAABBNode();
++
++ /* enable exclusive prefetch for >= AVX platforms */
++ #if defined(__AVX__)
++ BVH::prefetchW(ref);
++ #endif
++ BBox3fa bounds[N];
++
++ for (size_t i=0; i<N; i++)
++ if (unlikely(node->child(i) == BVH::emptyNode))
++ {
++ bounds[i] = BBox3fa(empty);
++ }
++ else
++ bounds[i] = recurse_bottom(node->child(i));
++
++ /* AOS to SOA transform */
++ BBox3vf<N> boundsT = transpose<N>(bounds);
++
++ /* set new bounds */
++ node->lower_x = boundsT.lower.x;
++ node->lower_y = boundsT.lower.y;
++ node->lower_z = boundsT.lower.z;
++ node->upper_x = boundsT.upper.x;
++ node->upper_y = boundsT.upper.y;
++ node->upper_z = boundsT.upper.z;
++
++ return merge<N>(bounds);
++ }
++
++ template<int N, typename Mesh, typename Primitive>
++ BVHNRefitT<N,Mesh,Primitive>::BVHNRefitT (BVH* bvh, Builder* builder, Mesh* mesh, size_t mode)
++ : bvh(bvh), builder(builder), refitter(new BVHNRefitter<N>(bvh,*(typename BVHNRefitter<N>::LeafBoundsInterface*)this)), mesh(mesh), topologyVersion(0) {}
++
++ template<int N, typename Mesh, typename Primitive>
++ void BVHNRefitT<N,Mesh,Primitive>::clear()
++ {
++ if (builder)
++ builder->clear();
++ }
++
++ template<int N, typename Mesh, typename Primitive>
++ void BVHNRefitT<N,Mesh,Primitive>::build()
++ {
++ if (mesh->topologyChanged(topologyVersion)) {
++ topologyVersion = mesh->getTopologyVersion();
++ builder->build();
++ }
++ else
++ refitter->refit();
++ }
++
++ template class BVHNRefitter<4>;
++ #if defined(__AVX__)
++ template class BVHNRefitter<8>;
++ #endif
++
++ #if defined(EMBREE_GEOMETRY_TRIANGLE)
++ Builder* BVH4Triangle4MeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH4Triangle4vMeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH4Triangle4iMeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++
++ Builder* BVH4Triangle4MeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,TriangleMesh,Triangle4> ((BVH4*)accel,BVH4Triangle4MeshBuilderSAH (accel,mesh,geomID,mode),mesh,mode); }
++ Builder* BVH4Triangle4vMeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,TriangleMesh,Triangle4v>((BVH4*)accel,BVH4Triangle4vMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ Builder* BVH4Triangle4iMeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,TriangleMesh,Triangle4i>((BVH4*)accel,BVH4Triangle4iMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ #if defined(__AVX__)
++ Builder* BVH8Triangle4MeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH8Triangle4vMeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH8Triangle4iMeshBuilderSAH (void* bvh, TriangleMesh* mesh, unsigned int geomID, size_t mode);
++
++ Builder* BVH8Triangle4MeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,TriangleMesh,Triangle4> ((BVH8*)accel,BVH8Triangle4MeshBuilderSAH (accel,mesh,geomID,mode),mesh,mode); }
++ Builder* BVH8Triangle4vMeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,TriangleMesh,Triangle4v>((BVH8*)accel,BVH8Triangle4vMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ Builder* BVH8Triangle4iMeshRefitSAH (void* accel, TriangleMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,TriangleMesh,Triangle4i>((BVH8*)accel,BVH8Triangle4iMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ #endif
++ #endif
++
++ #if defined(EMBREE_GEOMETRY_QUAD)
++ Builder* BVH4Quad4vMeshBuilderSAH (void* bvh, QuadMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH4Quad4vMeshRefitSAH (void* accel, QuadMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,QuadMesh,Quad4v>((BVH4*)accel,BVH4Quad4vMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++
++ #if defined(__AVX__)
++ Builder* BVH8Quad4vMeshBuilderSAH (void* bvh, QuadMesh* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH8Quad4vMeshRefitSAH (void* accel, QuadMesh* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,QuadMesh,Quad4v>((BVH8*)accel,BVH8Quad4vMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ #endif
++
++ #endif
++
++ #if defined(EMBREE_GEOMETRY_USER)
++ Builder* BVH4VirtualMeshBuilderSAH (void* bvh, UserGeometry* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH4VirtualMeshRefitSAH (void* accel, UserGeometry* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,UserGeometry,Object>((BVH4*)accel,BVH4VirtualMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++
++ #if defined(__AVX__)
++ Builder* BVH8VirtualMeshBuilderSAH (void* bvh, UserGeometry* mesh, unsigned int geomID, size_t mode);
++ Builder* BVH8VirtualMeshRefitSAH (void* accel, UserGeometry* mesh, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,UserGeometry,Object>((BVH8*)accel,BVH8VirtualMeshBuilderSAH(accel,mesh,geomID,mode),mesh,mode); }
++ #endif
++ #endif
++
++ #if defined(EMBREE_GEOMETRY_INSTANCE)
++ Builder* BVH4InstanceMeshBuilderSAH (void* bvh, Instance* mesh, Geometry::GTypeMask gtype, unsigned int geomID, size_t mode);
++ Builder* BVH4InstanceMeshRefitSAH (void* accel, Instance* mesh, Geometry::GTypeMask gtype, unsigned int geomID, size_t mode) { return new BVHNRefitT<4,Instance,InstancePrimitive>((BVH4*)accel,BVH4InstanceMeshBuilderSAH(accel,mesh,gtype,geomID,mode),mesh,mode); }
++
++ #if defined(__AVX__)
++ Builder* BVH8InstanceMeshBuilderSAH (void* bvh, Instance* mesh, Geometry::GTypeMask gtype, unsigned int geomID, size_t mode);
++ Builder* BVH8InstanceMeshRefitSAH (void* accel, Instance* mesh, Geometry::GTypeMask gtype, unsigned int geomID, size_t mode) { return new BVHNRefitT<8,Instance,InstancePrimitive>((BVH8*)accel,BVH8InstanceMeshBuilderSAH(accel,mesh,gtype,geomID,mode),mesh,mode); }
++ #endif
++ #endif
++
++ }
++ }