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// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "subgrid.h"
#include "quad_intersector_moeller.h"
namespace embree
{
namespace isa
{
/* ----------------------------- */
/* -- single ray intersectors -- */
/* ----------------------------- */
template<int M>
__forceinline void interpolateUV(MoellerTrumboreHitM<M> &hit,const GridMesh::Grid &g, const SubGrid& subgrid)
{
/* correct U,V interpolation across the entire grid */
const vint<M> sx((int)subgrid.x());
const vint<M> sy((int)subgrid.y());
const vint<M> sxM(sx + vint<M>(0,1,1,0));
const vint<M> syM(sy + vint<M>(0,0,1,1));
const float inv_resX = rcp((float)((int)g.resX-1));
const float inv_resY = rcp((float)((int)g.resY-1));
hit.U = (hit.U + (vfloat<M>)sxM * hit.absDen) * inv_resX;
hit.V = (hit.V + (vfloat<M>)syM * hit.absDen) * inv_resY;
}
template<int M, bool filter>
struct SubGridQuadMIntersector1MoellerTrumbore;
template<int M, bool filter>
struct SubGridQuadMIntersector1MoellerTrumbore
{
__forceinline SubGridQuadMIntersector1MoellerTrumbore() {}
__forceinline SubGridQuadMIntersector1MoellerTrumbore(const Ray& ray, const void* ptr) {}
__forceinline void intersect(RayHit& ray, IntersectContext* context,
const Vec3vf<M>& v0, const Vec3vf<M>& v1, const Vec3vf<M>& v2, const Vec3vf<M>& v3,
const GridMesh::Grid &g, const SubGrid& subgrid) const
{
MoellerTrumboreHitM<M> hit;
MoellerTrumboreIntersector1<M> intersector(ray,nullptr);
Intersect1EpilogMU<M,filter> epilog(ray,context,subgrid.geomID(),subgrid.primID());
/* intersect first triangle */
if (intersector.intersect(ray,v0,v1,v3,hit))
{
interpolateUV<M>(hit,g,subgrid);
epilog(hit.valid,hit);
}
/* intersect second triangle */
if (intersector.intersect(ray,v2,v3,v1,hit))
{
hit.U = hit.absDen - hit.U;
hit.V = hit.absDen - hit.V;
interpolateUV<M>(hit,g,subgrid);
epilog(hit.valid,hit);
}
}
__forceinline bool occluded(Ray& ray, IntersectContext* context,
const Vec3vf<M>& v0, const Vec3vf<M>& v1, const Vec3vf<M>& v2, const Vec3vf<M>& v3,
const GridMesh::Grid &g, const SubGrid& subgrid) const
{
MoellerTrumboreHitM<M> hit;
MoellerTrumboreIntersector1<M> intersector(ray,nullptr);
Occluded1EpilogMU<M,filter> epilog(ray,context,subgrid.geomID(),subgrid.primID());
/* intersect first triangle */
if (intersector.intersect(ray,v0,v1,v3,hit))
{
interpolateUV<M>(hit,g,subgrid);
if (epilog(hit.valid,hit))
return true;
}
/* intersect second triangle */
if (intersector.intersect(ray,v2,v3,v1,hit))
{
hit.U = hit.absDen - hit.U;
hit.V = hit.absDen - hit.V;
interpolateUV<M>(hit,g,subgrid);
if (epilog(hit.valid,hit))
return true;
}
return false;
}
};
#if defined (__AVX__)
/*! Intersects 4 quads with 1 ray using AVX */
template<bool filter>
struct SubGridQuadMIntersector1MoellerTrumbore<4,filter>
{
__forceinline SubGridQuadMIntersector1MoellerTrumbore() {}
__forceinline SubGridQuadMIntersector1MoellerTrumbore(const Ray& ray, const void* ptr) {}
template<typename Epilog>
__forceinline bool intersect(Ray& ray, const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3, const GridMesh::Grid &g, const SubGrid& subgrid, const Epilog& epilog) const
{
const Vec3vf8 vtx0(vfloat8(v0.x,v2.x),vfloat8(v0.y,v2.y),vfloat8(v0.z,v2.z));
#if !defined(EMBREE_BACKFACE_CULLING)
const Vec3vf8 vtx1(vfloat8(v1.x),vfloat8(v1.y),vfloat8(v1.z));
const Vec3vf8 vtx2(vfloat8(v3.x),vfloat8(v3.y),vfloat8(v3.z));
#else
const Vec3vf8 vtx1(vfloat8(v1.x,v3.x),vfloat8(v1.y,v3.y),vfloat8(v1.z,v3.z));
const Vec3vf8 vtx2(vfloat8(v3.x,v1.x),vfloat8(v3.y,v1.y),vfloat8(v3.z,v1.z));
#endif
MoellerTrumboreHitM<8> hit;
MoellerTrumboreIntersector1<8> intersector(ray,nullptr);
const vbool8 flags(0,0,0,0,1,1,1,1);
if (unlikely(intersector.intersect(ray,vtx0,vtx1,vtx2,hit)))
{
vfloat8 U = hit.U, V = hit.V, absDen = hit.absDen;
#if !defined(EMBREE_BACKFACE_CULLING)
hit.U = select(flags,absDen-V,U);
hit.V = select(flags,absDen-U,V);
hit.vNg *= select(flags,vfloat8(-1.0f),vfloat8(1.0f));
#else
hit.U = select(flags,absDen-U,U);
hit.V = select(flags,absDen-V,V);
#endif
/* correct U,V interpolation across the entire grid */
const vint8 sx((int)subgrid.x());
const vint8 sy((int)subgrid.y());
const vint8 sx8(sx + vint8(0,1,1,0,0,1,1,0));
const vint8 sy8(sy + vint8(0,0,1,1,0,0,1,1));
const float inv_resX = rcp((float)((int)g.resX-1));
const float inv_resY = rcp((float)((int)g.resY-1));
hit.U = (hit.U + (vfloat8)sx8 * absDen) * inv_resX;
hit.V = (hit.V + (vfloat8)sy8 * absDen) * inv_resY;
if (unlikely(epilog(hit.valid,hit)))
return true;
}
return false;
}
__forceinline bool intersect(RayHit& ray, IntersectContext* context,
const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3,
const GridMesh::Grid &g, const SubGrid& subgrid) const
{
return intersect(ray,v0,v1,v2,v3,g,subgrid,Intersect1EpilogMU<8,filter>(ray,context,subgrid.geomID(),subgrid.primID()));
}
__forceinline bool occluded(Ray& ray, IntersectContext* context,
const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3,
const GridMesh::Grid &g, const SubGrid& subgrid) const
{
return intersect(ray,v0,v1,v2,v3,g,subgrid,Occluded1EpilogMU<8,filter>(ray,context,subgrid.geomID(),subgrid.primID()));
}
};
#endif
// ============================================================================================================================
// ============================================================================================================================
// ============================================================================================================================
/* ----------------------------- */
/* -- ray packet intersectors -- */
/* ----------------------------- */
template<int K>
struct SubGridQuadHitK
{
__forceinline SubGridQuadHitK(const vfloat<K>& U,
const vfloat<K>& V,
const vfloat<K>& T,
const vfloat<K>& absDen,
const Vec3vf<K>& Ng,
const vbool<K>& flags,
const GridMesh::Grid &g,
const SubGrid& subgrid,
const unsigned int i)
: U(U), V(V), T(T), absDen(absDen), flags(flags), tri_Ng(Ng), g(g), subgrid(subgrid), i(i) {}
__forceinline std::tuple<vfloat<K>,vfloat<K>,vfloat<K>,Vec3vf<K>> operator() () const
{
const vfloat<K> rcpAbsDen = rcp(absDen);
const vfloat<K> t = T * rcpAbsDen;
const vfloat<K> u0 = min(U * rcpAbsDen,1.0f);
const vfloat<K> v0 = min(V * rcpAbsDen,1.0f);
const vfloat<K> u1 = vfloat<K>(1.0f) - u0;
const vfloat<K> v1 = vfloat<K>(1.0f) - v0;
const vfloat<K> uu = select(flags,u1,u0);
const vfloat<K> vv = select(flags,v1,v0);
const unsigned int sx = subgrid.x() + (unsigned int)(i % 2);
const unsigned int sy = subgrid.y() + (unsigned int)(i >>1);
const float inv_resX = rcp((float)(int)(g.resX-1));
const float inv_resY = rcp((float)(int)(g.resY-1));
const vfloat<K> u = (uu + (float)(int)sx) * inv_resX;
const vfloat<K> v = (vv + (float)(int)sy) * inv_resY;
const Vec3vf<K> Ng(tri_Ng.x,tri_Ng.y,tri_Ng.z);
return std::make_tuple(u,v,t,Ng);
}
private:
const vfloat<K> U;
const vfloat<K> V;
const vfloat<K> T;
const vfloat<K> absDen;
const vbool<K> flags;
const Vec3vf<K> tri_Ng;
const GridMesh::Grid &g;
const SubGrid& subgrid;
const size_t i;
};
template<int M, int K, bool filter>
struct SubGridQuadMIntersectorKMoellerTrumboreBase
{
__forceinline SubGridQuadMIntersectorKMoellerTrumboreBase(const vbool<K>& valid, const RayK<K>& ray) {}
template<typename Epilog>
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
RayK<K>& ray,
const Vec3vf<K>& tri_v0,
const Vec3vf<K>& tri_e1,
const Vec3vf<K>& tri_e2,
const Vec3vf<K>& tri_Ng,
const vbool<K>& flags,
const GridMesh::Grid &g,
const SubGrid &subgrid,
const unsigned int i,
const Epilog& epilog) const
{
/* calculate denominator */
vbool<K> valid = valid0;
const Vec3vf<K> C = tri_v0 - ray.org;
const Vec3vf<K> R = cross(C,ray.dir);
const vfloat<K> den = dot(tri_Ng,ray.dir);
const vfloat<K> absDen = abs(den);
const vfloat<K> sgnDen = signmsk(den);
/* test against edge p2 p0 */
const vfloat<K> U = dot(R,tri_e2) ^ sgnDen;
valid &= U >= 0.0f;
if (likely(none(valid))) return false;
/* test against edge p0 p1 */
const vfloat<K> V = dot(R,tri_e1) ^ sgnDen;
valid &= V >= 0.0f;
if (likely(none(valid))) return false;
/* test against edge p1 p2 */
const vfloat<K> W = absDen-U-V;
valid &= W >= 0.0f;
if (likely(none(valid))) return false;
/* perform depth test */
const vfloat<K> T = dot(tri_Ng,C) ^ sgnDen;
valid &= (absDen*ray.tnear() < T) & (T <= absDen*ray.tfar);
if (unlikely(none(valid))) return false;
/* perform backface culling */
#if defined(EMBREE_BACKFACE_CULLING)
valid &= den < vfloat<K>(zero);
if (unlikely(none(valid))) return false;
#else
valid &= den != vfloat<K>(zero);
if (unlikely(none(valid))) return false;
#endif
/* calculate hit information */
SubGridQuadHitK<K> hit(U,V,T,absDen,tri_Ng,flags,g,subgrid,i);
return epilog(valid,hit);
}
template<typename Epilog>
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
RayK<K>& ray,
const Vec3vf<K>& tri_v0,
const Vec3vf<K>& tri_v1,
const Vec3vf<K>& tri_v2,
const vbool<K>& flags,
const GridMesh::Grid &g,
const SubGrid &subgrid,
const unsigned int i,
const Epilog& epilog) const
{
const Vec3vf<K> e1 = tri_v0-tri_v1;
const Vec3vf<K> e2 = tri_v2-tri_v0;
const Vec3vf<K> Ng = cross(e2,e1);
return intersectK(valid0,ray,tri_v0,e1,e2,Ng,flags,g,subgrid,i,epilog);
}
template<typename Epilog>
__forceinline bool intersectK(const vbool<K>& valid0,
RayK<K>& ray,
const Vec3vf<K>& v0,
const Vec3vf<K>& v1,
const Vec3vf<K>& v2,
const Vec3vf<K>& v3,
const GridMesh::Grid &g,
const SubGrid &subgrid,
const unsigned int i,
const Epilog& epilog) const
{
intersectK(valid0,ray,v0,v1,v3,vbool<K>(false),g,subgrid,i,epilog);
if (none(valid0)) return true;
intersectK(valid0,ray,v2,v3,v1,vbool<K>(true ),g,subgrid,i,epilog);
return none(valid0);
}
static __forceinline bool intersect1(RayK<K>& ray,
size_t k,
const Vec3vf<M>& tri_v0,
const Vec3vf<M>& tri_e1,
const Vec3vf<M>& tri_e2,
const Vec3vf<M>& tri_Ng,
MoellerTrumboreHitM<M> &hit)
{
/* calculate denominator */
const Vec3vf<M> O = broadcast<vfloat<M>>(ray.org,k);
const Vec3vf<M> D = broadcast<vfloat<M>>(ray.dir,k);
const Vec3vf<M> C = Vec3vf<M>(tri_v0) - O;
const Vec3vf<M> R = cross(C,D);
const vfloat<M> den = dot(Vec3vf<M>(tri_Ng),D);
const vfloat<M> absDen = abs(den);
const vfloat<M> sgnDen = signmsk(den);
/* perform edge tests */
const vfloat<M> U = dot(R,Vec3vf<M>(tri_e2)) ^ sgnDen;
const vfloat<M> V = dot(R,Vec3vf<M>(tri_e1)) ^ sgnDen;
/* perform backface culling */
#if defined(EMBREE_BACKFACE_CULLING)
vbool<M> valid = (den < vfloat<M>(zero)) & (U >= 0.0f) & (V >= 0.0f) & (U+V<=absDen);
#else
vbool<M> valid = (den != vfloat<M>(zero)) & (U >= 0.0f) & (V >= 0.0f) & (U+V<=absDen);
#endif
if (likely(none(valid))) return false;
/* perform depth test */
const vfloat<M> T = dot(Vec3vf<M>(tri_Ng),C) ^ sgnDen;
valid &= (absDen*vfloat<M>(ray.tnear()[k]) < T) & (T <= absDen*vfloat<M>(ray.tfar[k]));
if (likely(none(valid))) return false;
/* calculate hit information */
new (&hit) MoellerTrumboreHitM<M>(valid,U,V,T,absDen,tri_Ng);
return true;
}
static __forceinline bool intersect1(RayK<K>& ray,
size_t k,
const Vec3vf<M>& v0,
const Vec3vf<M>& v1,
const Vec3vf<M>& v2,
MoellerTrumboreHitM<M> &hit)
{
const Vec3vf<M> e1 = v0-v1;
const Vec3vf<M> e2 = v2-v0;
const Vec3vf<M> Ng = cross(e2,e1);
return intersect1(ray,k,v0,e1,e2,Ng,hit);
}
};
template<int M, int K, bool filter>
struct SubGridQuadMIntersectorKMoellerTrumbore : public SubGridQuadMIntersectorKMoellerTrumboreBase<M,K,filter>
{
__forceinline SubGridQuadMIntersectorKMoellerTrumbore(const vbool<K>& valid, const RayK<K>& ray)
: SubGridQuadMIntersectorKMoellerTrumboreBase<M,K,filter>(valid,ray) {}
__forceinline void intersect1(RayHitK<K>& ray, size_t k, IntersectContext* context,
const Vec3vf<M>& v0, const Vec3vf<M>& v1, const Vec3vf<M>& v2, const Vec3vf<M>& v3, const GridMesh::Grid &g, const SubGrid &subgrid) const
{
Intersect1KEpilogMU<M,K,filter> epilog(ray,k,context,subgrid.geomID(),subgrid.primID());
MoellerTrumboreHitM<4> hit;
if (SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>::intersect1(ray,k,v0,v1,v3,hit))
{
interpolateUV<M>(hit,g,subgrid);
epilog(hit.valid,hit);
}
if (SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>::intersect1(ray,k,v2,v3,v1,hit))
{
hit.U = hit.absDen - hit.U;
hit.V = hit.absDen - hit.V;
interpolateUV<M>(hit,g,subgrid);
epilog(hit.valid,hit);
}
}
__forceinline bool occluded1(RayK<K>& ray, size_t k, IntersectContext* context,
const Vec3vf<M>& v0, const Vec3vf<M>& v1, const Vec3vf<M>& v2, const Vec3vf<M>& v3, const GridMesh::Grid &g, const SubGrid &subgrid) const
{
Occluded1KEpilogMU<M,K,filter> epilog(ray,k,context,subgrid.geomID(),subgrid.primID());
MoellerTrumboreHitM<4> hit;
if (SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>::intersect1(ray,k,v0,v1,v3,hit))
{
interpolateUV<M>(hit,g,subgrid);
if (epilog(hit.valid,hit)) return true;
}
if (SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>::intersect1(ray,k,v2,v3,v1,hit))
{
hit.U = hit.absDen - hit.U;
hit.V = hit.absDen - hit.V;
interpolateUV<M>(hit,g,subgrid);
if (epilog(hit.valid,hit)) return true;
}
return false;
}
};
#if defined (__AVX__)
/*! Intersects 4 quads with 1 ray using AVX */
template<int K, bool filter>
struct SubGridQuadMIntersectorKMoellerTrumbore<4,K,filter> : public SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>
{
__forceinline SubGridQuadMIntersectorKMoellerTrumbore(const vbool<K>& valid, const RayK<K>& ray)
: SubGridQuadMIntersectorKMoellerTrumboreBase<4,K,filter>(valid,ray) {}
template<typename Epilog>
__forceinline bool intersect1(RayK<K>& ray, size_t k,const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3,
const GridMesh::Grid &g, const SubGrid &subgrid, const Epilog& epilog) const
{
const Vec3vf8 vtx0(vfloat8(v0.x,v2.x),vfloat8(v0.y,v2.y),vfloat8(v0.z,v2.z));
#if !defined(EMBREE_BACKFACE_CULLING)
const Vec3vf8 vtx1(vfloat8(v1.x),vfloat8(v1.y),vfloat8(v1.z));
const Vec3vf8 vtx2(vfloat8(v3.x),vfloat8(v3.y),vfloat8(v3.z));
#else
const Vec3vf8 vtx1(vfloat8(v1.x,v3.x),vfloat8(v1.y,v3.y),vfloat8(v1.z,v3.z));
const Vec3vf8 vtx2(vfloat8(v3.x,v1.x),vfloat8(v3.y,v1.y),vfloat8(v3.z,v1.z));
#endif
const vbool8 flags(0,0,0,0,1,1,1,1);
MoellerTrumboreHitM<8> hit;
if (SubGridQuadMIntersectorKMoellerTrumboreBase<8,K,filter>::intersect1(ray,k,vtx0,vtx1,vtx2,hit))
{
vfloat8 U = hit.U, V = hit.V, absDen = hit.absDen;
#if !defined(EMBREE_BACKFACE_CULLING)
hit.U = select(flags,absDen-V,U);
hit.V = select(flags,absDen-U,V);
hit.vNg *= select(flags,vfloat8(-1.0f),vfloat8(1.0f));
#else
hit.U = select(flags,absDen-U,U);
hit.V = select(flags,absDen-V,V);
#endif
/* correct U,V interpolation across the entire grid */
const vint8 sx((int)subgrid.x());
const vint8 sy((int)subgrid.y());
const vint8 sx8(sx + vint8(0,1,1,0,0,1,1,0));
const vint8 sy8(sy + vint8(0,0,1,1,0,0,1,1));
const float inv_resX = rcp((float)((int)g.resX-1));
const float inv_resY = rcp((float)((int)g.resY-1));
hit.U = (hit.U + (vfloat8)sx8 * absDen) * inv_resX;
hit.V = (hit.V + (vfloat8)sy8 * absDen) * inv_resY;
if (unlikely(epilog(hit.valid,hit)))
return true;
}
return false;
}
__forceinline bool intersect1(RayHitK<K>& ray, size_t k, IntersectContext* context,
const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3, const GridMesh::Grid &g, const SubGrid &subgrid) const
{
return intersect1(ray,k,v0,v1,v2,v3,g,subgrid,Intersect1KEpilogMU<8,K,filter>(ray,k,context,subgrid.geomID(),subgrid.primID()));
}
__forceinline bool occluded1(RayK<K>& ray, size_t k, IntersectContext* context,
const Vec3vf4& v0, const Vec3vf4& v1, const Vec3vf4& v2, const Vec3vf4& v3, const GridMesh::Grid &g, const SubGrid &subgrid) const
{
return intersect1(ray,k,v0,v1,v2,v3,g,subgrid,Occluded1KEpilogMU<8,K,filter>(ray,k,context,subgrid.geomID(),subgrid.primID()));
}
};
#endif
}
}
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