a69cc9f13d
Since Embree v3.13.0 supports AARCH64, switch back to the
official repo instead of using Embree-aarch64.
`thirdparty/embree/patches/godot-changes.patch` should now contain
an accurate diff of the changes done to the library.
(cherry picked from commit 767e374dce)
419 lines
15 KiB
C++
419 lines
15 KiB
C++
// Copyright 2009-2021 Intel Corporation
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
#pragma once
|
|
|
|
#include "triangle.h"
|
|
#include "intersector_epilog.h"
|
|
|
|
/*! This intersector implements a modified version of the Woop's ray-triangle intersection test */
|
|
|
|
namespace embree
|
|
{
|
|
namespace isa
|
|
{
|
|
template<int M>
|
|
struct WoopHitM
|
|
{
|
|
__forceinline WoopHitM() {}
|
|
|
|
__forceinline WoopHitM(const vbool<M>& valid,
|
|
const vfloat<M>& U,
|
|
const vfloat<M>& V,
|
|
const vfloat<M>& T,
|
|
const vfloat<M>& inv_det,
|
|
const Vec3vf<M>& Ng)
|
|
: U(U), V(V), T(T), inv_det(inv_det), valid(valid), vNg(Ng) {}
|
|
|
|
__forceinline void finalize()
|
|
{
|
|
vt = T;
|
|
vu = U*inv_det;
|
|
vv = V*inv_det;
|
|
}
|
|
|
|
__forceinline Vec2f uv (const size_t i) const { return Vec2f(vu[i],vv[i]); }
|
|
__forceinline float t (const size_t i) const { return vt[i]; }
|
|
__forceinline Vec3fa Ng(const size_t i) const { return Vec3fa(vNg.x[i],vNg.y[i],vNg.z[i]); }
|
|
|
|
private:
|
|
const vfloat<M> U;
|
|
const vfloat<M> V;
|
|
const vfloat<M> T;
|
|
const vfloat<M> inv_det;
|
|
|
|
public:
|
|
const vbool<M> valid;
|
|
vfloat<M> vu;
|
|
vfloat<M> vv;
|
|
vfloat<M> vt;
|
|
Vec3vf<M> vNg;
|
|
};
|
|
|
|
template<int M>
|
|
struct WoopPrecalculations1
|
|
{
|
|
unsigned int kx,ky,kz;
|
|
Vec3vf<M> org;
|
|
Vec3fa S;
|
|
__forceinline WoopPrecalculations1() {}
|
|
|
|
__forceinline WoopPrecalculations1(const Ray& ray, const void* ptr)
|
|
{
|
|
kz = maxDim(abs(ray.dir));
|
|
kx = (kz+1) % 3;
|
|
ky = (kx+1) % 3;
|
|
const float inv_dir_kz = rcp(ray.dir[kz]);
|
|
if (ray.dir[kz]) std::swap(kx,ky);
|
|
S.x = ray.dir[kx] * inv_dir_kz;
|
|
S.y = ray.dir[ky] * inv_dir_kz;
|
|
S.z = inv_dir_kz;
|
|
org = Vec3vf<M>(ray.org[kx],ray.org[ky],ray.org[kz]);
|
|
}
|
|
};
|
|
|
|
|
|
template<int M>
|
|
struct WoopIntersector1
|
|
{
|
|
|
|
typedef WoopPrecalculations1<M> Precalculations;
|
|
|
|
__forceinline WoopIntersector1() {}
|
|
|
|
__forceinline WoopIntersector1(const Ray& ray, const void* ptr) {}
|
|
|
|
static __forceinline bool intersect(const vbool<M>& valid0,
|
|
Ray& ray,
|
|
const Precalculations& pre,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_v1,
|
|
const Vec3vf<M>& tri_v2,
|
|
WoopHitM<M>& hit)
|
|
{
|
|
vbool<M> valid = valid0;
|
|
|
|
/* vertices relative to ray origin */
|
|
const Vec3vf<M> org = Vec3vf<M>(pre.org.x,pre.org.y,pre.org.z);
|
|
const Vec3vf<M> A = Vec3vf<M>(tri_v0[pre.kx],tri_v0[pre.ky],tri_v0[pre.kz]) - org;
|
|
const Vec3vf<M> B = Vec3vf<M>(tri_v1[pre.kx],tri_v1[pre.ky],tri_v1[pre.kz]) - org;
|
|
const Vec3vf<M> C = Vec3vf<M>(tri_v2[pre.kx],tri_v2[pre.ky],tri_v2[pre.kz]) - org;
|
|
|
|
/* shear and scale vertices */
|
|
const vfloat<M> Ax = nmadd(A.z,pre.S.x,A.x);
|
|
const vfloat<M> Ay = nmadd(A.z,pre.S.y,A.y);
|
|
const vfloat<M> Bx = nmadd(B.z,pre.S.x,B.x);
|
|
const vfloat<M> By = nmadd(B.z,pre.S.y,B.y);
|
|
const vfloat<M> Cx = nmadd(C.z,pre.S.x,C.x);
|
|
const vfloat<M> Cy = nmadd(C.z,pre.S.y,C.y);
|
|
|
|
/* scaled barycentric */
|
|
const vfloat<M> U0 = Cx*By;
|
|
const vfloat<M> U1 = Cy*Bx;
|
|
const vfloat<M> V0 = Ax*Cy;
|
|
const vfloat<M> V1 = Ay*Cx;
|
|
const vfloat<M> W0 = Bx*Ay;
|
|
const vfloat<M> W1 = By*Ax;
|
|
#if !defined(__AVX512F__)
|
|
valid &= (U0 >= U1) & (V0 >= V1) & (W0 >= W1) |
|
|
(U0 <= U1) & (V0 <= V1) & (W0 <= W1);
|
|
#else
|
|
valid &= ge(ge(U0 >= U1,V0,V1),W0,W1) | le(le(U0 <= U1,V0,V1),W0,W1);
|
|
#endif
|
|
|
|
if (likely(none(valid))) return false;
|
|
const vfloat<M> U = U0-U1;
|
|
const vfloat<M> V = V0-V1;
|
|
const vfloat<M> W = W0-W1;
|
|
|
|
const vfloat<M> det = U+V+W;
|
|
|
|
valid &= det != 0.0f;
|
|
const vfloat<M> inv_det = rcp(det);
|
|
|
|
const vfloat<M> Az = pre.S.z * A.z;
|
|
const vfloat<M> Bz = pre.S.z * B.z;
|
|
const vfloat<M> Cz = pre.S.z * C.z;
|
|
const vfloat<M> T = madd(U,Az,madd(V,Bz,W*Cz));
|
|
const vfloat<M> t = T * inv_det;
|
|
/* perform depth test */
|
|
valid &= (vfloat<M>(ray.tnear()) < t) & (t <= vfloat<M>(ray.tfar));
|
|
if (likely(none(valid))) return false;
|
|
|
|
const Vec3vf<M> tri_Ng = cross(tri_v2-tri_v0,tri_v0-tri_v1);
|
|
|
|
/* update hit information */
|
|
new (&hit) WoopHitM<M>(valid,U,V,t,inv_det,tri_Ng);
|
|
return true;
|
|
}
|
|
|
|
static __forceinline bool intersect(Ray& ray,
|
|
const Precalculations& pre,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
WoopHitM<M>& hit)
|
|
{
|
|
vbool<M> valid = true;
|
|
return intersect(valid,ray,pre,v0,v1,v2,hit);
|
|
}
|
|
|
|
|
|
template<typename Epilog>
|
|
static __forceinline bool intersect(Ray& ray,
|
|
const Precalculations& pre,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const Epilog& epilog)
|
|
{
|
|
WoopHitM<M> hit;
|
|
if (likely(intersect(ray,pre,v0,v1,v2,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
static __forceinline bool intersect(const vbool<M>& valid,
|
|
Ray& ray,
|
|
const Precalculations& pre,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const Epilog& epilog)
|
|
{
|
|
WoopHitM<M> hit;
|
|
if (likely(intersect(valid,ray,pre,v0,v1,v2,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
#if 0
|
|
template<int K>
|
|
struct WoopHitK
|
|
{
|
|
__forceinline WoopHitK(const vfloat<K>& U, const vfloat<K>& V, const vfloat<K>& T, const vfloat<K>& absDen, const Vec3vf<K>& Ng)
|
|
: U(U), V(V), T(T), absDen(absDen), Ng(Ng) {}
|
|
|
|
__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> u = U * rcpAbsDen;
|
|
const vfloat<K> v = V * rcpAbsDen;
|
|
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 Vec3vf<K> Ng;
|
|
};
|
|
|
|
template<int M, int K>
|
|
struct WoopIntersectorK
|
|
{
|
|
__forceinline WoopIntersectorK(const vbool<K>& valid, const RayK<K>& ray) {}
|
|
|
|
/*! Intersects K rays with one of M triangles. */
|
|
template<typename Epilog>
|
|
__forceinline vbool<K> intersectK(const vbool<K>& valid0,
|
|
//RayK<K>& ray,
|
|
const Vec3vf<K>& ray_org,
|
|
const Vec3vf<K>& ray_dir,
|
|
const vfloat<K>& ray_tnear,
|
|
const vfloat<K>& ray_tfar,
|
|
const Vec3vf<K>& tri_v0,
|
|
const Vec3vf<K>& tri_e1,
|
|
const Vec3vf<K>& tri_e2,
|
|
const Vec3vf<K>& tri_Ng,
|
|
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(tri_e2,R) ^ sgnDen;
|
|
valid &= U >= 0.0f;
|
|
if (likely(none(valid))) return false;
|
|
|
|
/* test against edge p0 p1 */
|
|
const vfloat<K> V = dot(tri_e1,R) ^ 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 */
|
|
WoopHitK<K> hit(U,V,T,absDen,tri_Ng);
|
|
return epilog(valid,hit);
|
|
}
|
|
|
|
/*! Intersects K rays with one of M triangles. */
|
|
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 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.org,ray.dir,ray.tnear(),ray.tfar,tri_v0,e1,e2,Ng,epilog);
|
|
}
|
|
|
|
/*! Intersects K rays with one of M triangles. */
|
|
template<typename Epilog>
|
|
__forceinline vbool<K> intersectEdgeK(const vbool<K>& valid0,
|
|
RayK<K>& ray,
|
|
const Vec3vf<K>& tri_v0,
|
|
const Vec3vf<K>& tri_e1,
|
|
const Vec3vf<K>& tri_e2,
|
|
const Epilog& epilog) const
|
|
{
|
|
const Vec3vf<K> tri_Ng = cross(tri_e2,tri_e1);
|
|
return intersectK(valid0,ray.org,ray.dir,ray.tnear(),ray.tfar,tri_v0,tri_e1,tri_e2,tri_Ng,epilog);
|
|
}
|
|
|
|
/*! Intersect k'th ray from ray packet of size K with M triangles. */
|
|
__forceinline bool intersectEdge(RayK<K>& ray,
|
|
size_t k,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_e1,
|
|
const Vec3vf<M>& tri_e2,
|
|
WoopHitM<M>& hit) const
|
|
{
|
|
/* calculate denominator */
|
|
typedef Vec3vf<M> Vec3vfM;
|
|
const Vec3vf<M> tri_Ng = cross(tri_e2,tri_e1);
|
|
|
|
const Vec3vfM O = broadcast<vfloat<M>>(ray.org,k);
|
|
const Vec3vfM D = broadcast<vfloat<M>>(ray.dir,k);
|
|
const Vec3vfM C = Vec3vfM(tri_v0) - O;
|
|
const Vec3vfM R = cross(C,D);
|
|
const vfloat<M> den = dot(Vec3vfM(tri_Ng),D);
|
|
const vfloat<M> absDen = abs(den);
|
|
const vfloat<M> sgnDen = signmsk(den);
|
|
|
|
/* perform edge tests */
|
|
const vfloat<M> U = dot(Vec3vf<M>(tri_e2),R) ^ sgnDen;
|
|
const vfloat<M> V = dot(Vec3vf<M>(tri_e1),R) ^ 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) WoopHitM<M>(valid,U,V,T,absDen,tri_Ng);
|
|
return true;
|
|
}
|
|
|
|
__forceinline bool intersectEdge(RayK<K>& ray,
|
|
size_t k,
|
|
const BBox<vfloat<M>>& time_range,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_e1,
|
|
const Vec3vf<M>& tri_e2,
|
|
WoopHitM<M>& hit) const
|
|
{
|
|
if (likely(intersect(ray,k,tri_v0,tri_e1,tri_e2,hit)))
|
|
{
|
|
hit.valid &= time_range.lower <= vfloat<M>(ray.time[k]);
|
|
hit.valid &= vfloat<M>(ray.time[k]) < time_range.upper;
|
|
return any(hit.valid);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersectEdge(RayK<K>& ray,
|
|
size_t k,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_e1,
|
|
const Vec3vf<M>& tri_e2,
|
|
const Epilog& epilog) const
|
|
{
|
|
WoopHitM<M> hit;
|
|
if (likely(intersectEdge(ray,k,tri_v0,tri_e1,tri_e2,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersectEdge(RayK<K>& ray,
|
|
size_t k,
|
|
const BBox<vfloat<M>>& time_range,
|
|
const Vec3vf<M>& tri_v0,
|
|
const Vec3vf<M>& tri_e1,
|
|
const Vec3vf<M>& tri_e2,
|
|
const Epilog& epilog) const
|
|
{
|
|
WoopHitM<M> hit;
|
|
if (likely(intersectEdge(ray,k,time_range,tri_v0,tri_e1,tri_e2,hit))) return epilog(hit.valid,hit);
|
|
return false;
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersect(RayK<K>& ray,
|
|
size_t k,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const Epilog& epilog) const
|
|
{
|
|
const Vec3vf<M> e1 = v0-v1;
|
|
const Vec3vf<M> e2 = v2-v0;
|
|
return intersectEdge(ray,k,v0,e1,e2,epilog);
|
|
}
|
|
|
|
template<typename Epilog>
|
|
__forceinline bool intersect(RayK<K>& ray,
|
|
size_t k,
|
|
const BBox<vfloat<M>>& time_range,
|
|
const Vec3vf<M>& v0,
|
|
const Vec3vf<M>& v1,
|
|
const Vec3vf<M>& v2,
|
|
const Epilog& epilog) const
|
|
{
|
|
const Vec3vf<M> e1 = v0-v1;
|
|
const Vec3vf<M> e2 = v2-v0;
|
|
return intersectEdge(ray,k,time_range,v0,e1,e2,epilog);
|
|
}
|
|
};
|
|
#endif
|
|
}
|
|
}
|