void build()
{
/* we reset the allocator when the mesh size changed */
if (mesh && mesh->numPrimitivesChanged) {
bvh->alloc.clear();
}
/* skip build for empty scene */
const size_t numOriginalPrimitives = mesh ? mesh->size() : scene->getNumPrimitives<Mesh,false>();
if (numOriginalPrimitives == 0) {
prims0.clear();
bvh->clear();
return;
}
double t0 = bvh->preBuild(mesh ? "" : TOSTRING(isa) "::BVH" + toString(N) + "BuilderFastSpatialSAH");
/* create primref array */
const size_t numSplitPrimitives = max(numOriginalPrimitives,size_t(splitFactor*numOriginalPrimitives));
prims0.resize(numSplitPrimitives);
PrimInfo pinfo = mesh ?
createPrimRefArray(mesh,prims0,bvh->scene->progressInterface) :
createPrimRefArray(scene,Mesh::geom_type,false,prims0,bvh->scene->progressInterface);
Splitter splitter(scene);
/* enable os_malloc for two level build */
if (mesh)
bvh->alloc.setOSallocation(true);
const size_t node_bytes = pinfo.size()*sizeof(typename BVH::AlignedNode)/(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;
NodeRef root = BVHBuilderBinnedFastSpatialSAH::build<NodeRef>(
typename BVH::CreateAlloc(bvh),
typename BVH::AlignedNode::Create2(),
typename BVH::AlignedNode::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->shrink();
}
bvh->cleanup();
bvh->postBuild(t0);
}
void build(size_t, size_t)
{
/* progress monitor */
auto progress = [&] (size_t dn) { bvh->scene->progressMonitor(dn); };
auto virtualprogress = BuildProgressMonitorFromClosure(progress);
/* fast path for empty BVH */
const size_t numPrimitives = scene->getNumPrimitives<BezierCurves,1>();
if (numPrimitives == 0) {
prims.clear();
bvh->set(BVH::emptyNode,empty,0);
return;
}
double t0 = bvh->preBuild(TOSTRING(isa) "::BVH" + toString(N) + "BuilderHairSAH");
//profile(1,5,numPrimitives,[&] (ProfileTimer& timer) {
/* create primref array */
bvh->alloc.init_estimate(numPrimitives*sizeof(Primitive));
prims.resize(numPrimitives);
const PrimInfo pinfo = createBezierRefArray<1>(scene,prims,virtualprogress);
/* build hierarchy */
typename BVH::NodeRef root = bvh_obb_builder_binned_sah<N>
(
[&] () { return bvh->alloc.threadLocal2(); },
[&] (const PrimInfo* children, const size_t numChildren,
HeuristicArrayBinningSAH<BezierPrim> alignedHeuristic,
FastAllocator::ThreadLocal2* alloc) -> Node*
{
Node* node = (Node*) alloc->alloc0.malloc(sizeof(Node),16); node->clear();
for (size_t i=0; i<numChildren; i++)
node->set(i,children[i].geomBounds);
return node;
},
[&] (const PrimInfo* children, const size_t numChildren,
UnalignedHeuristicArrayBinningSAH<BezierPrim> unalignedHeuristic,
FastAllocator::ThreadLocal2* alloc) -> UnalignedNode*
{
UnalignedNode* node = (UnalignedNode*) alloc->alloc0.malloc(sizeof(UnalignedNode),16); node->clear();
for (size_t i=0; i<numChildren; i++)
{
const LinearSpace3fa space = unalignedHeuristic.computeAlignedSpace(children[i]);
const PrimInfo sinfo = unalignedHeuristic.computePrimInfo(children[i],space);
node->set(i,OBBox3fa(space,sinfo.geomBounds));
}
return node;
},
[&] (size_t depth, const PrimInfo& pinfo, FastAllocator::ThreadLocal2* alloc) -> NodeRef
{
size_t items = pinfo.size();
size_t start = pinfo.begin;
Primitive* accel = (Primitive*) alloc->alloc1.malloc(items*sizeof(Primitive));
NodeRef node = bvh->encodeLeaf((char*)accel,items);
for (size_t i=0; i<items; i++) {
accel[i].fill(prims.data(),start,pinfo.end,bvh->scene,false);
}
return node;
},
progress,
prims.data(),pinfo,N,BVH::maxBuildDepthLeaf,1,1,BVH::maxLeafBlocks);
bvh->set(root,pinfo.geomBounds,pinfo.size());
//});
/* clear temporary data for static geometry */
if (scene->isStatic()) {
prims.clear();
bvh->shrink();
}
bvh->cleanup();
bvh->postBuild(t0);
}