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++ // Copyright 2009-2021 Intel Corporation
++ // SPDX-License-Identifier: Apache-2.0
++
++ #pragma once
++
++ #include "bvh_node_base.h"
++
++ namespace embree
++ {
++ /*! BVHN Quantized Node */
++ template<int N>
++ struct __aligned(8) QuantizedBaseNode_t
++ {
++ typedef unsigned char T;
++ static const T MIN_QUAN = 0;
++ static const T MAX_QUAN = 255;
++
++ /*! Clears the node. */
++ __forceinline void clear() {
++ for (size_t i=0; i<N; i++) lower_x[i] = lower_y[i] = lower_z[i] = MAX_QUAN;
++ for (size_t i=0; i<N; i++) upper_x[i] = upper_y[i] = upper_z[i] = MIN_QUAN;
++ }
++
++ /*! Returns bounds of specified child. */
++ __forceinline BBox3fa bounds(size_t i) const
++ {
++ assert(i < N);
++ const Vec3fa lower(madd(scale.x,(float)lower_x[i],start.x),
++ madd(scale.y,(float)lower_y[i],start.y),
++ madd(scale.z,(float)lower_z[i],start.z));
++ const Vec3fa upper(madd(scale.x,(float)upper_x[i],start.x),
++ madd(scale.y,(float)upper_y[i],start.y),
++ madd(scale.z,(float)upper_z[i],start.z));
++ return BBox3fa(lower,upper);
++ }
++
++ /*! Returns extent of bounds of specified child. */
++ __forceinline Vec3fa extent(size_t i) const {
++ return bounds(i).size();
++ }
++
++ static __forceinline void init_dim(const vfloat<N> &lower,
++ const vfloat<N> &upper,
++ T lower_quant[N],
++ T upper_quant[N],
++ float &start,
++ float &scale)
++ {
++ /* quantize bounds */
++ const vbool<N> m_valid = lower != vfloat<N>(pos_inf);
++ const float minF = reduce_min(lower);
++ const float maxF = reduce_max(upper);
++ float diff = (1.0f+2.0f*float(ulp))*(maxF - minF);
++ float decode_scale = diff / float(MAX_QUAN);
++ if (decode_scale == 0.0f) decode_scale = 2.0f*FLT_MIN; // result may have been flushed to zero
++ assert(madd(decode_scale,float(MAX_QUAN),minF) >= maxF);
++ const float encode_scale = diff > 0 ? (float(MAX_QUAN) / diff) : 0.0f;
++ vint<N> ilower = max(vint<N>(floor((lower - vfloat<N>(minF))*vfloat<N>(encode_scale))),MIN_QUAN);
++ vint<N> iupper = min(vint<N>(ceil ((upper - vfloat<N>(minF))*vfloat<N>(encode_scale))),MAX_QUAN);
++
++ /* lower/upper correction */
++ vbool<N> m_lower_correction = (madd(vfloat<N>(ilower),decode_scale,minF)) > lower;
++ vbool<N> m_upper_correction = (madd(vfloat<N>(iupper),decode_scale,minF)) < upper;
++ ilower = max(select(m_lower_correction,ilower-1,ilower),MIN_QUAN);
++ iupper = min(select(m_upper_correction,iupper+1,iupper),MAX_QUAN);
++
++ /* disable invalid lanes */
++ ilower = select(m_valid,ilower,MAX_QUAN);
++ iupper = select(m_valid,iupper,MIN_QUAN);
++
++ /* store as uchar to memory */
++ vint<N>::store(lower_quant,ilower);
++ vint<N>::store(upper_quant,iupper);
++ start = minF;
++ scale = decode_scale;
++
++ #if defined(DEBUG)
++ vfloat<N> extract_lower( vint<N>::loadu(lower_quant) );
++ vfloat<N> extract_upper( vint<N>::loadu(upper_quant) );
++ vfloat<N> final_extract_lower = madd(extract_lower,decode_scale,minF);
++ vfloat<N> final_extract_upper = madd(extract_upper,decode_scale,minF);
++ assert( (movemask(final_extract_lower <= lower ) & movemask(m_valid)) == movemask(m_valid));
++ assert( (movemask(final_extract_upper >= upper ) & movemask(m_valid)) == movemask(m_valid));
++ #endif
++ }
++
++ __forceinline void init_dim(AABBNode_t<NodeRefPtr<N>,N>& node)
++ {
++ init_dim(node.lower_x,node.upper_x,lower_x,upper_x,start.x,scale.x);
++ init_dim(node.lower_y,node.upper_y,lower_y,upper_y,start.y,scale.y);
++ init_dim(node.lower_z,node.upper_z,lower_z,upper_z,start.z,scale.z);
++ }
++
++ __forceinline vbool<N> validMask() const { return vint<N>::loadu(lower_x) <= vint<N>::loadu(upper_x); }
++
++ #if defined(__AVX512F__) // KNL
++ __forceinline vbool16 validMask16() const { return le(0xff,vint<16>::loadu(lower_x),vint<16>::loadu(upper_x)); }
++ #endif
++ __forceinline vfloat<N> dequantizeLowerX() const { return madd(vfloat<N>(vint<N>::loadu(lower_x)),scale.x,vfloat<N>(start.x)); }
++
++ __forceinline vfloat<N> dequantizeUpperX() const { return madd(vfloat<N>(vint<N>::loadu(upper_x)),scale.x,vfloat<N>(start.x)); }
++
++ __forceinline vfloat<N> dequantizeLowerY() const { return madd(vfloat<N>(vint<N>::loadu(lower_y)),scale.y,vfloat<N>(start.y)); }
++
++ __forceinline vfloat<N> dequantizeUpperY() const { return madd(vfloat<N>(vint<N>::loadu(upper_y)),scale.y,vfloat<N>(start.y)); }
++
++ __forceinline vfloat<N> dequantizeLowerZ() const { return madd(vfloat<N>(vint<N>::loadu(lower_z)),scale.z,vfloat<N>(start.z)); }
++
++ __forceinline vfloat<N> dequantizeUpperZ() const { return madd(vfloat<N>(vint<N>::loadu(upper_z)),scale.z,vfloat<N>(start.z)); }
++
++ template <int M>
++ __forceinline vfloat<M> dequantize(const size_t offset) const { return vfloat<M>(vint<M>::loadu(all_planes+offset)); }
++
++ #if defined(__AVX512F__)
++ __forceinline vfloat16 dequantizeLowerUpperX(const vint16 &p) const { return madd(vfloat16(permute(vint<16>::loadu(lower_x),p)),scale.x,vfloat16(start.x)); }
++ __forceinline vfloat16 dequantizeLowerUpperY(const vint16 &p) const { return madd(vfloat16(permute(vint<16>::loadu(lower_y),p)),scale.y,vfloat16(start.y)); }
++ __forceinline vfloat16 dequantizeLowerUpperZ(const vint16 &p) const { return madd(vfloat16(permute(vint<16>::loadu(lower_z),p)),scale.z,vfloat16(start.z)); }
++ #endif
++
++ union {
++ struct {
++ T lower_x[N]; //!< 8bit discretized X dimension of lower bounds of all N children
++ T upper_x[N]; //!< 8bit discretized X dimension of upper bounds of all N children
++ T lower_y[N]; //!< 8bit discretized Y dimension of lower bounds of all N children
++ T upper_y[N]; //!< 8bit discretized Y dimension of upper bounds of all N children
++ T lower_z[N]; //!< 8bit discretized Z dimension of lower bounds of all N children
++ T upper_z[N]; //!< 8bit discretized Z dimension of upper bounds of all N children
++ };
++ T all_planes[6*N];
++ };
++
++ Vec3f start;
++ Vec3f scale;
++
++ friend embree_ostream operator<<(embree_ostream o, const QuantizedBaseNode_t& n)
++ {
++ o << "QuantizedBaseNode { " << embree_endl;
++ o << " start " << n.start << embree_endl;
++ o << " scale " << n.scale << embree_endl;
++ o << " lower_x " << vuint<N>::loadu(n.lower_x) << embree_endl;
++ o << " upper_x " << vuint<N>::loadu(n.upper_x) << embree_endl;
++ o << " lower_y " << vuint<N>::loadu(n.lower_y) << embree_endl;
++ o << " upper_y " << vuint<N>::loadu(n.upper_y) << embree_endl;
++ o << " lower_z " << vuint<N>::loadu(n.lower_z) << embree_endl;
++ o << " upper_z " << vuint<N>::loadu(n.upper_z) << embree_endl;
++ o << "}" << embree_endl;
++ return o;
++ }
++
++ };
++
++ template<typename NodeRef, int N>
++ struct __aligned(8) QuantizedNode_t : public BaseNode_t<NodeRef, N>, QuantizedBaseNode_t<N>
++ {
++ using BaseNode_t<NodeRef,N>::children;
++ using QuantizedBaseNode_t<N>::lower_x;
++ using QuantizedBaseNode_t<N>::upper_x;
++ using QuantizedBaseNode_t<N>::lower_y;
++ using QuantizedBaseNode_t<N>::upper_y;
++ using QuantizedBaseNode_t<N>::lower_z;
++ using QuantizedBaseNode_t<N>::upper_z;
++ using QuantizedBaseNode_t<N>::start;
++ using QuantizedBaseNode_t<N>::scale;
++ using QuantizedBaseNode_t<N>::init_dim;
++
++ __forceinline void setRef(size_t i, const NodeRef& ref) {
++ assert(i < N);
++ children[i] = ref;
++ }
++
++ struct Create2
++ {
++ template<typename BuildRecord>
++ __forceinline NodeRef operator() (BuildRecord* children, const size_t n, const FastAllocator::CachedAllocator& alloc) const
++ {
++ __aligned(64) AABBNode_t<NodeRef,N> node;
++ node.clear();
++ for (size_t i=0; i<n; i++) {
++ node.setBounds(i,children[i].bounds());
++ }
++ QuantizedNode_t *qnode = (QuantizedNode_t*) alloc.malloc0(sizeof(QuantizedNode_t), NodeRef::byteAlignment);
++ qnode->init(node);
++
++ return (size_t)qnode | NodeRef::tyQuantizedNode;
++ }
++ };
++
++ struct Set2
++ {
++ template<typename BuildRecord>
++ __forceinline NodeRef operator() (const BuildRecord& precord, const BuildRecord* crecords, NodeRef ref, NodeRef* children, const size_t num) const
++ {
++ #if defined(DEBUG)
++ // check that empty children are only at the end of the child list
++ bool emptyChild = false;
++ for (size_t i=0; i<num; i++) {
++ emptyChild |= (children[i] == NodeRef::emptyNode);
++ assert(emptyChild == (children[i] == NodeRef::emptyNode));
++ }
++ #endif
++ QuantizedNode_t* node = ref.quantizedNode();
++ for (size_t i=0; i<num; i++) node->setRef(i,children[i]);
++ return ref;
++ }
++ };
++
++ __forceinline void init(AABBNode_t<NodeRef,N>& node)
++ {
++ for (size_t i=0;i<N;i++) children[i] = NodeRef::emptyNode;
++ init_dim(node);
++ }
++
++ };
++
++ /*! BVHN Quantized Node */
++ template<int N>
++ struct __aligned(8) QuantizedBaseNodeMB_t
++ {
++ QuantizedBaseNode_t<N> node0;
++ QuantizedBaseNode_t<N> node1;
++
++ /*! Clears the node. */
++ __forceinline void clear() {
++ node0.clear();
++ node1.clear();
++ }
++
++ /*! Returns bounds of specified child. */
++ __forceinline BBox3fa bounds(size_t i) const
++ {
++ assert(i < N);
++ BBox3fa bounds0 = node0.bounds(i);
++ BBox3fa bounds1 = node1.bounds(i);
++ bounds0.extend(bounds1);
++ return bounds0;
++ }
++
++ /*! Returns extent of bounds of specified child. */
++ __forceinline Vec3fa extent(size_t i) const {
++ return bounds(i).size();
++ }
++
++ __forceinline vbool<N> validMask() const { return node0.validMask(); }
++
++ template<typename T>
++ __forceinline vfloat<N> dequantizeLowerX(const T t) const { return lerp(node0.dequantizeLowerX(),node1.dequantizeLowerX(),t); }
++ template<typename T>
++ __forceinline vfloat<N> dequantizeUpperX(const T t) const { return lerp(node0.dequantizeUpperX(),node1.dequantizeUpperX(),t); }
++ template<typename T>
++ __forceinline vfloat<N> dequantizeLowerY(const T t) const { return lerp(node0.dequantizeLowerY(),node1.dequantizeLowerY(),t); }
++ template<typename T>
++ __forceinline vfloat<N> dequantizeUpperY(const T t) const { return lerp(node0.dequantizeUpperY(),node1.dequantizeUpperY(),t); }
++ template<typename T>
++ __forceinline vfloat<N> dequantizeLowerZ(const T t) const { return lerp(node0.dequantizeLowerZ(),node1.dequantizeLowerZ(),t); }
++ template<typename T>
++ __forceinline vfloat<N> dequantizeUpperZ(const T t) const { return lerp(node0.dequantizeUpperZ(),node1.dequantizeUpperZ(),t); }
++
++
++ template<int M>
++ __forceinline vfloat<M> dequantizeLowerX(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeLowerX()[i]),vfloat<M>(node1.dequantizeLowerX()[i]),t); }
++ template<int M>
++ __forceinline vfloat<M> dequantizeUpperX(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeUpperX()[i]),vfloat<M>(node1.dequantizeUpperX()[i]),t); }
++ template<int M>
++ __forceinline vfloat<M> dequantizeLowerY(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeLowerY()[i]),vfloat<M>(node1.dequantizeLowerY()[i]),t); }
++ template<int M>
++ __forceinline vfloat<M> dequantizeUpperY(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeUpperY()[i]),vfloat<M>(node1.dequantizeUpperY()[i]),t); }
++ template<int M>
++ __forceinline vfloat<M> dequantizeLowerZ(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeLowerZ()[i]),vfloat<M>(node1.dequantizeLowerZ()[i]),t); }
++ template<int M>
++ __forceinline vfloat<M> dequantizeUpperZ(const size_t i, const vfloat<M> &t) const { return lerp(vfloat<M>(node0.dequantizeUpperZ()[i]),vfloat<M>(node1.dequantizeUpperZ()[i]),t); }
++
++ };
++ }