Revision control
++ // Copyright 2009-2021 Intel Corporation
++ // SPDX-License-Identifier: Apache-2.0
++
++ #include "bvh.h"
++ #include "bvh_builder.h"
++
++ #include "../builders/primrefgen.h"
++ #include "../builders/primrefgen_presplit.h"
++ #include "../builders/splitter.h"
++
++ #include "../geometry/linei.h"
++ #include "../geometry/triangle.h"
++ #include "../geometry/trianglev.h"
++ #include "../geometry/trianglev_mb.h"
++ #include "../geometry/trianglei.h"
++ #include "../geometry/quadv.h"
++ #include "../geometry/quadi.h"
++ #include "../geometry/object.h"
++ #include "../geometry/instance.h"
++ #include "../geometry/subgrid.h"
++
++ #include "../common/state.h"
++
++ namespace embree
++ {
++ namespace isa
++ {
++ template<int N, typename Primitive>
++ struct CreateLeafSpatial
++ {
++ typedef BVHN<N> BVH;
++ typedef typename BVH::NodeRef NodeRef;
++
++ __forceinline CreateLeafSpatial (BVH* bvh) : bvh(bvh) {}
++
++ __forceinline NodeRef operator() (const PrimRef* prims, const range<size_t>& set, const FastAllocator::CachedAllocator& alloc) const
++ {
++ size_t n = set.size();
++ size_t items = Primitive::blocks(n);
++ size_t start = set.begin();
++ Primitive* accel = (Primitive*) alloc.malloc1(items*sizeof(Primitive),BVH::byteAlignment);
++ typename BVH::NodeRef node = BVH::encodeLeaf((char*)accel,items);
++ for (size_t i=0; i<items; i++) {
++ accel[i].fill(prims,start,set.end(),bvh->scene);
++ }
++ return node;
++ }
++
++ BVH* bvh;
++ };
++
++ template<int N, typename Mesh, typename Primitive, typename Splitter>
++ struct BVHNBuilderFastSpatialSAH : public Builder
++ {
++ typedef BVHN<N> BVH;
++ typedef typename BVH::NodeRef NodeRef;
++ BVH* bvh;
++ Scene* scene;
++ Mesh* mesh;
++ mvector<PrimRef> prims0;
++ GeneralBVHBuilder::Settings settings;
++ const float splitFactor;
++ unsigned int geomID_ = std::numeric_limits<unsigned int>::max();
++ unsigned int numPreviousPrimitives = 0;
++
++ BVHNBuilderFastSpatialSAH (BVH* bvh, Scene* scene, const size_t sahBlockSize, const float intCost, const size_t minLeafSize, const size_t maxLeafSize, const size_t mode)
++ : bvh(bvh), scene(scene), mesh(nullptr), prims0(scene->device,0), settings(sahBlockSize, minLeafSize, min(maxLeafSize,Primitive::max_size()*BVH::maxLeafBlocks), travCost, intCost, DEFAULT_SINGLE_THREAD_THRESHOLD),
++ splitFactor(scene->device->max_spatial_split_replications) {}
++
++ BVHNBuilderFastSpatialSAH (BVH* bvh, Mesh* mesh, const unsigned int geomID, const size_t sahBlockSize, const float intCost, const size_t minLeafSize, const size_t maxLeafSize, const size_t mode)
++ : bvh(bvh), scene(nullptr), mesh(mesh), prims0(bvh->device,0), settings(sahBlockSize, minLeafSize, min(maxLeafSize,Primitive::max_size()*BVH::maxLeafBlocks), travCost, intCost, DEFAULT_SINGLE_THREAD_THRESHOLD),
++ splitFactor(scene->device->max_spatial_split_replications), geomID_(geomID) {}
++
++ // FIXME: shrink bvh->alloc in destructor here and in other builders too
++
++ void build()
++ {
++ /* we reset the allocator when the mesh size changed */
++ if (mesh && mesh->numPrimitives != numPreviousPrimitives) {
++ bvh->alloc.clear();
++ }
++
++ /* skip build for empty scene */
++ const size_t numOriginalPrimitives = mesh ? mesh->size() : scene->getNumPrimitives(Mesh::geom_type,false);
++ numPreviousPrimitives = numOriginalPrimitives;
++ if (numOriginalPrimitives == 0) {
++ prims0.clear();
++ bvh->clear();
++ return;
++ }
++
++ const unsigned int maxGeomID = mesh ? geomID_ : scene->getMaxGeomID<Mesh,false>();
++ const bool usePreSplits = scene->device->useSpatialPreSplits || (maxGeomID >= ((unsigned int)1 << (32-RESERVED_NUM_SPATIAL_SPLITS_GEOMID_BITS)));
++ double t0 = bvh->preBuild(mesh ? "" : TOSTRING(isa) "::BVH" + toString(N) + (usePreSplits ? "BuilderFastSpatialPresplitSAH" : "BuilderFastSpatialSAH"));
++
++ /* create primref array */
++ const size_t numSplitPrimitives = max(numOriginalPrimitives,size_t(splitFactor*numOriginalPrimitives));
++ prims0.resize(numSplitPrimitives);
++
++ /* enable os_malloc for two level build */
++ if (mesh)
++ bvh->alloc.setOSallocation(true);
++
++ NodeRef root(0);
++ PrimInfo pinfo;
++
++
++ if (likely(usePreSplits))
++ {
++ /* spatial presplit SAH BVH builder */
++ pinfo = mesh ?
++ createPrimRefArray_presplit<Mesh,Splitter>(mesh,maxGeomID,numOriginalPrimitives,prims0,bvh->scene->progressInterface) :
++ createPrimRefArray_presplit<Mesh,Splitter>(scene,Mesh::geom_type,false,numOriginalPrimitives,prims0,bvh->scene->progressInterface);
++
++ const size_t node_bytes = pinfo.size()*sizeof(typename BVH::AABBNode)/(4*N);
++ const size_t leaf_bytes = size_t(1.2*Primitive::blocks(pinfo.size())*sizeof(Primitive));
++ bvh->alloc.init_estimate(node_bytes+leaf_bytes);
++ settings.singleThreadThreshold = bvh->alloc.fixSingleThreadThreshold(N,DEFAULT_SINGLE_THREAD_THRESHOLD,pinfo.size(),node_bytes+leaf_bytes);
++
++ settings.branchingFactor = N;
++ settings.maxDepth = BVH::maxBuildDepthLeaf;
++
++ /* call BVH builder */
++ root = BVHNBuilderVirtual<N>::build(&bvh->alloc,CreateLeafSpatial<N,Primitive>(bvh),bvh->scene->progressInterface,prims0.data(),pinfo,settings);
++ }
++ else
++ {
++ /* standard spatial split SAH BVH builder */
++ pinfo = mesh ?
++ createPrimRefArray(mesh,geomID_,numSplitPrimitives,prims0,bvh->scene->progressInterface) :
++ createPrimRefArray(scene,Mesh::geom_type,false,numSplitPrimitives,prims0,bvh->scene->progressInterface);
++
++ Splitter splitter(scene);
++
++ const size_t node_bytes = pinfo.size()*sizeof(typename BVH::AABBNode)/(4*N);
++ const size_t leaf_bytes = size_t(1.2*Primitive::blocks(pinfo.size())*sizeof(Primitive));
++ bvh->alloc.init_estimate(node_bytes+leaf_bytes);
++ settings.singleThreadThreshold = bvh->alloc.fixSingleThreadThreshold(N,DEFAULT_SINGLE_THREAD_THRESHOLD,pinfo.size(),node_bytes+leaf_bytes);
++
++ settings.branchingFactor = N;
++ settings.maxDepth = BVH::maxBuildDepthLeaf;
++
++ /* call BVH builder */
++ root = BVHBuilderBinnedFastSpatialSAH::build<NodeRef>(
++ typename BVH::CreateAlloc(bvh),
++ typename BVH::AABBNode::Create2(),
++ typename BVH::AABBNode::Set2(),
++ CreateLeafSpatial<N,Primitive>(bvh),
++ splitter,
++ bvh->scene->progressInterface,
++ prims0.data(),
++ numSplitPrimitives,
++ pinfo,settings);
++
++ /* ==================== */
++ }
++
++ bvh->set(root,LBBox3fa(pinfo.geomBounds),pinfo.size());
++ bvh->layoutLargeNodes(size_t(pinfo.size()*0.005f));
++
++ /* clear temporary data for static geometry */
++ if (scene && scene->isStaticAccel()) {
++ prims0.clear();
++ }
++ bvh->cleanup();
++ bvh->postBuild(t0);
++ }
++
++ void clear() {
++ prims0.clear();
++ }
++ };
++
++ /************************************************************************************/
++ /************************************************************************************/
++ /************************************************************************************/
++ /************************************************************************************/
++
++
++ #if defined(EMBREE_GEOMETRY_TRIANGLE)
++
++ Builder* BVH4Triangle4SceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<4,TriangleMesh,Triangle4,TriangleSplitterFactory>((BVH4*)bvh,scene,4,1.0f,4,inf,mode); }
++ Builder* BVH4Triangle4vSceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<4,TriangleMesh,Triangle4v,TriangleSplitterFactory>((BVH4*)bvh,scene,4,1.0f,4,inf,mode); }
++ Builder* BVH4Triangle4iSceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<4,TriangleMesh,Triangle4i,TriangleSplitterFactory>((BVH4*)bvh,scene,4,1.0f,4,inf,mode); }
++
++ #if defined(__AVX__)
++ Builder* BVH8Triangle4SceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<8,TriangleMesh,Triangle4,TriangleSplitterFactory>((BVH8*)bvh,scene,4,1.0f,4,inf,mode); }
++ Builder* BVH8Triangle4vSceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<8,TriangleMesh,Triangle4v,TriangleSplitterFactory>((BVH8*)bvh,scene,4,1.0f,4,inf,mode); }
++ #endif
++ #endif
++
++ #if defined(EMBREE_GEOMETRY_QUAD)
++ Builder* BVH4Quad4vSceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<4,QuadMesh,Quad4v,QuadSplitterFactory>((BVH4*)bvh,scene,4,1.0f,4,inf,mode); }
++
++ #if defined(__AVX__)
++ Builder* BVH8Quad4vSceneBuilderFastSpatialSAH (void* bvh, Scene* scene, size_t mode) { return new BVHNBuilderFastSpatialSAH<8,QuadMesh,Quad4v,QuadSplitterFactory>((BVH8*)bvh,scene,4,1.0f,4,inf,mode); }
++ #endif
++
++ #endif
++ }
++ }