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virtualx-engine/thirdparty/embree/kernels/geometry/cone.h
jfons 767e374dce Upgrade Embree to the latest official release. 
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.
2021-05-21 17:00:24 +02:00

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// Copyright 2009-2021 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "../common/ray.h"
namespace embree
{
namespace isa
{
struct Cone
{
const Vec3fa p0; //!< start position of cone
const Vec3fa p1; //!< end position of cone
const float r0; //!< start radius of cone
const float r1; //!< end radius of cone
__forceinline Cone(const Vec3fa& p0, const float r0, const Vec3fa& p1, const float r1)
: p0(p0), p1(p1), r0(r0), r1(r1) {}
__forceinline bool intersect(const Vec3fa& org, const Vec3fa& dir,
BBox1f& t_o,
float& u0_o, Vec3fa& Ng0_o,
float& u1_o, Vec3fa& Ng1_o) const
{
/* calculate quadratic equation to solve */
const Vec3fa v0 = p0-org;
const Vec3fa v1 = p1-org;
const float rl = rcp_length(v1-v0);
const Vec3fa P0 = v0, dP = (v1-v0)*rl;
const float dr = (r1-r0)*rl;
const Vec3fa O = -P0, dO = dir;
const float dOdO = dot(dO,dO);
const float OdO = dot(dO,O);
const float OO = dot(O,O);
const float dOz = dot(dP,dO);
const float Oz = dot(dP,O);
const float R = r0 + Oz*dr;
const float A = dOdO - sqr(dOz) * (1.0f+sqr(dr));
const float B = 2.0f * (OdO - dOz*(Oz + R*dr));
const float C = OO - (sqr(Oz) + sqr(R));
/* we miss the cone if determinant is smaller than zero */
const float D = B*B - 4.0f*A*C;
if (D < 0.0f) return false;
/* special case for rays that are "parallel" to the cone */
const float eps = float(1<<8)*float(ulp)*max(abs(dOdO),abs(sqr(dOz)));
if (unlikely(abs(A) < eps))
{
/* cylinder case */
if (abs(dr) < 16.0f*float(ulp)) {
if (C <= 0.0f) { t_o = BBox1f(neg_inf,pos_inf); return true; }
else { t_o = BBox1f(pos_inf,neg_inf); return false; }
}
/* cone case */
else
{
/* if we hit the negative cone there cannot be a hit */
const float t = -C/B;
const float z0 = Oz+t*dOz;
const float z0r = r0+z0*dr;
if (z0r < 0.0f) return false;
/* test if we start inside or outside the cone */
if (dOz*dr > 0.0f) t_o = BBox1f(t,pos_inf);
else t_o = BBox1f(neg_inf,t);
}
}
/* standard case for "non-parallel" rays */
else
{
const float Q = sqrt(D);
const float rcp_2A = rcp(2.0f*A);
t_o.lower = (-B-Q)*rcp_2A;
t_o.upper = (-B+Q)*rcp_2A;
/* standard case where both hits are on same cone */
if (likely(A > 0.0f)) {
const float z0 = Oz+t_o.lower*dOz;
const float z0r = r0+z0*dr;
if (z0r < 0.0f) return false;
}
/* special case where the hits are on the positive and negative cone */
else
{
/* depending on the ray direction and the open direction
* of the cone we have a hit from inside or outside the
* cone */
if (dOz*dr > 0) t_o.upper = pos_inf;
else t_o.lower = neg_inf;
}
}
/* calculates u and Ng for near hit */
{
u0_o = (Oz+t_o.lower*dOz)*rl;
const Vec3fa Pr = t_o.lower*dir;
const Vec3fa Pl = v0 + u0_o*(v1-v0);
const Vec3fa R = normalize(Pr-Pl);
const Vec3fa U = (p1-p0)+(r1-r0)*R;
const Vec3fa V = cross(p1-p0,R);
Ng0_o = cross(V,U);
}
/* calculates u and Ng for far hit */
{
u1_o = (Oz+t_o.upper*dOz)*rl;
const Vec3fa Pr = t_o.upper*dir;
const Vec3fa Pl = v0 + u1_o*(v1-v0);
const Vec3fa R = normalize(Pr-Pl);
const Vec3fa U = (p1-p0)+(r1-r0)*R;
const Vec3fa V = cross(p1-p0,R);
Ng1_o = cross(V,U);
}
return true;
}
__forceinline bool intersect(const Vec3fa& org, const Vec3fa& dir, BBox1f& t_o) const
{
float u0_o; Vec3fa Ng0_o; float u1_o; Vec3fa Ng1_o;
return intersect(org,dir,t_o,u0_o,Ng0_o,u1_o,Ng1_o);
}
static bool verify(const size_t id, const Cone& cone, const Ray& ray, bool shouldhit, const float t0, const float t1)
{
float eps = 0.001f;
BBox1f t; bool hit;
hit = cone.intersect(ray.org,ray.dir,t);
bool failed = hit != shouldhit;
if (shouldhit) failed |= std::isinf(t0) ? t0 != t.lower : (t0 == -1E6) ? t.lower > -1E6f : abs(t0-t.lower) > eps;
if (shouldhit) failed |= std::isinf(t1) ? t1 != t.upper : (t1 == +1E6) ? t.upper < +1E6f : abs(t1-t.upper) > eps;
if (!failed) return true;
embree_cout << "Cone test " << id << " failed: cone = " << cone << ", ray = " << ray << ", hit = " << hit << ", t = " << t << embree_endl;
return false;
}
/* verify cone class */
static bool verify()
{
bool passed = true;
const Cone cone0(Vec3fa(0.0f,0.0f,0.0f),0.0f,Vec3fa(1.0f,0.0f,0.0f),1.0f);
passed &= verify(0,cone0,Ray(Vec3fa(-2.0f,1.0f,0.0f),Vec3fa(+1.0f,+0.0f,+0.0f),0.0f,float(inf)),true,3.0f,pos_inf);
passed &= verify(1,cone0,Ray(Vec3fa(+2.0f,1.0f,0.0f),Vec3fa(-1.0f,+0.0f,+0.0f),0.0f,float(inf)),true,neg_inf,1.0f);
passed &= verify(2,cone0,Ray(Vec3fa(-1.0f,0.0f,2.0f),Vec3fa(+0.0f,+0.0f,-1.0f),0.0f,float(inf)),false,0.0f,0.0f);
passed &= verify(3,cone0,Ray(Vec3fa(+1.0f,0.0f,2.0f),Vec3fa(+0.0f,+0.0f,-1.0f),0.0f,float(inf)),true,1.0f,3.0f);
passed &= verify(4,cone0,Ray(Vec3fa(-1.0f,0.0f,0.0f),Vec3fa(+1.0f,+0.0f,+0.0f),0.0f,float(inf)),true,1.0f,pos_inf);
passed &= verify(5,cone0,Ray(Vec3fa(+1.0f,0.0f,0.0f),Vec3fa(-1.0f,+0.0f,+0.0f),0.0f,float(inf)),true,neg_inf,1.0f);
passed &= verify(6,cone0,Ray(Vec3fa(+0.0f,0.0f,1.0f),Vec3fa(+0.0f,+0.0f,-1.0f),0.0f,float(inf)),true,1.0f,1.0f);
passed &= verify(7,cone0,Ray(Vec3fa(+0.0f,1.0f,0.0f),Vec3fa(-1.0f,-1.0f,+0.0f),0.0f,float(inf)),false,0.0f,0.0f);
passed &= verify(8,cone0,Ray(Vec3fa(+0.0f,1.0f,0.0f),Vec3fa(+1.0f,-1.0f,+0.0f),0.0f,float(inf)),true,0.5f,+1E6);
passed &= verify(9,cone0,Ray(Vec3fa(+0.0f,1.0f,0.0f),Vec3fa(-1.0f,+1.0f,+0.0f),0.0f,float(inf)),true,-1E6,-0.5f);
const Cone cone1(Vec3fa(0.0f,0.0f,0.0f),1.0f,Vec3fa(1.0f,0.0f,0.0f),0.0f);
passed &= verify(10,cone1,Ray(Vec3fa(-2.0f,1.0f,0.0f),Vec3fa(+1.0f,+0.0f,+0.0f),0.0f,float(inf)),true,neg_inf,2.0f);
passed &= verify(11,cone1,Ray(Vec3fa(-1.0f,0.0f,2.0f),Vec3fa(+0.0f,+0.0f,-1.0f),0.0f,float(inf)),true,0.0f,4.0f);
const Cone cylinder(Vec3fa(0.0f,0.0f,0.0f),1.0f,Vec3fa(1.0f,0.0f,0.0f),1.0f);
passed &= verify(12,cylinder,Ray(Vec3fa(-2.0f,1.0f,0.0f),Vec3fa( 0.0f,-1.0f,+0.0f),0.0f,float(inf)),true,0.0f,2.0f);
passed &= verify(13,cylinder,Ray(Vec3fa(+2.0f,1.0f,0.0f),Vec3fa( 0.0f,-1.0f,+0.0f),0.0f,float(inf)),true,0.0f,2.0f);
passed &= verify(14,cylinder,Ray(Vec3fa(+2.0f,1.0f,2.0f),Vec3fa( 0.0f,-1.0f,+0.0f),0.0f,float(inf)),false,0.0f,0.0f);
passed &= verify(15,cylinder,Ray(Vec3fa(+0.0f,0.0f,0.0f),Vec3fa( 1.0f, 0.0f,+0.0f),0.0f,float(inf)),true,neg_inf,pos_inf);
passed &= verify(16,cylinder,Ray(Vec3fa(+0.0f,0.0f,0.0f),Vec3fa(-1.0f, 0.0f,+0.0f),0.0f,float(inf)),true,neg_inf,pos_inf);
passed &= verify(17,cylinder,Ray(Vec3fa(+0.0f,2.0f,0.0f),Vec3fa( 1.0f, 0.0f,+0.0f),0.0f,float(inf)),false,pos_inf,neg_inf);
passed &= verify(18,cylinder,Ray(Vec3fa(+0.0f,2.0f,0.0f),Vec3fa(-1.0f, 0.0f,+0.0f),0.0f,float(inf)),false,pos_inf,neg_inf);
return passed;
}
/*! output operator */
friend __forceinline embree_ostream operator<<(embree_ostream cout, const Cone& c) {
return cout << "Cone { p0 = " << c.p0 << ", r0 = " << c.r0 << ", p1 = " << c.p1 << ", r1 = " << c.r1 << "}";
}
};
template<int N>
struct ConeN
{
typedef Vec3<vfloat<N>> Vec3vfN;
const Vec3vfN p0; //!< start position of cone
const Vec3vfN p1; //!< end position of cone
const vfloat<N> r0; //!< start radius of cone
const vfloat<N> r1; //!< end radius of cone
__forceinline ConeN(const Vec3vfN& p0, const vfloat<N>& r0, const Vec3vfN& p1, const vfloat<N>& r1)
: p0(p0), p1(p1), r0(r0), r1(r1) {}
__forceinline Cone operator[] (const size_t i) const
{
assert(i<N);
return Cone(Vec3fa(p0.x[i],p0.y[i],p0.z[i]),r0[i],Vec3fa(p1.x[i],p1.y[i],p1.z[i]),r1[i]);
}
__forceinline vbool<N> intersect(const Vec3fa& org, const Vec3fa& dir,
BBox<vfloat<N>>& t_o,
vfloat<N>& u0_o, Vec3vfN& Ng0_o,
vfloat<N>& u1_o, Vec3vfN& Ng1_o) const
{
/* calculate quadratic equation to solve */
const Vec3vfN v0 = p0-Vec3vfN(org);
const Vec3vfN v1 = p1-Vec3vfN(org);
const vfloat<N> rl = rcp_length(v1-v0);
const Vec3vfN P0 = v0, dP = (v1-v0)*rl;
const vfloat<N> dr = (r1-r0)*rl;
const Vec3vfN O = -P0, dO = dir;
const vfloat<N> dOdO = dot(dO,dO);
const vfloat<N> OdO = dot(dO,O);
const vfloat<N> OO = dot(O,O);
const vfloat<N> dOz = dot(dP,dO);
const vfloat<N> Oz = dot(dP,O);
const vfloat<N> R = r0 + Oz*dr;
const vfloat<N> A = dOdO - sqr(dOz) * (vfloat<N>(1.0f)+sqr(dr));
const vfloat<N> B = 2.0f * (OdO - dOz*(Oz + R*dr));
const vfloat<N> C = OO - (sqr(Oz) + sqr(R));
/* we miss the cone if determinant is smaller than zero */
const vfloat<N> D = B*B - 4.0f*A*C;
vbool<N> valid = D >= 0.0f;
if (none(valid)) return valid;
/* special case for rays that are "parallel" to the cone */
const vfloat<N> eps = float(1<<8)*float(ulp)*max(abs(dOdO),abs(sqr(dOz)));
const vbool<N> validt = valid & (abs(A) < eps);
const vbool<N> validf = valid & !(abs(A) < eps);
if (unlikely(any(validt)))
{
const vboolx validtt = validt & (abs(dr) < 16.0f*float(ulp));
const vboolx validtf = validt & (abs(dr) >= 16.0f*float(ulp));
/* cylinder case */
if (unlikely(any(validtt)))
{
t_o.lower = select(validtt, select(C <= 0.0f, vfloat<N>(neg_inf), vfloat<N>(pos_inf)), t_o.lower);
t_o.upper = select(validtt, select(C <= 0.0f, vfloat<N>(pos_inf), vfloat<N>(neg_inf)), t_o.upper);
valid &= !validtt | C <= 0.0f;
}
/* cone case */
if (any(validtf))
{
/* if we hit the negative cone there cannot be a hit */
const vfloat<N> t = -C/B;
const vfloat<N> z0 = Oz+t*dOz;
const vfloat<N> z0r = r0+z0*dr;
valid &= !validtf | z0r >= 0.0f;
/* test if we start inside or outside the cone */
t_o.lower = select(validtf, select(dOz*dr > 0.0f, t, vfloat<N>(neg_inf)), t_o.lower);
t_o.upper = select(validtf, select(dOz*dr > 0.0f, vfloat<N>(pos_inf), t), t_o.upper);
}
}
/* standard case for "non-parallel" rays */
if (likely(any(validf)))
{
const vfloat<N> Q = sqrt(D);
const vfloat<N> rcp_2A = 0.5f*rcp(A);
t_o.lower = select(validf, (-B-Q)*rcp_2A, t_o.lower);
t_o.upper = select(validf, (-B+Q)*rcp_2A, t_o.upper);
/* standard case where both hits are on same cone */
const vbool<N> validft = validf & A>0.0f;
const vbool<N> validff = validf & !(A>0.0f);
if (any(validft)) {
const vfloat<N> z0 = Oz+t_o.lower*dOz;
const vfloat<N> z0r = r0+z0*dr;
valid &= !validft | z0r >= 0.0f;
}
/* special case where the hits are on the positive and negative cone */
if (any(validff)) {
/* depending on the ray direction and the open direction
* of the cone we have a hit from inside or outside the
* cone */
t_o.lower = select(validff, select(dOz*dr > 0.0f, t_o.lower, float(neg_inf)), t_o.lower);
t_o.upper = select(validff, select(dOz*dr > 0.0f, float(pos_inf), t_o.upper), t_o.upper);
}
}
/* calculates u and Ng for near hit */
{
u0_o = (Oz+t_o.lower*dOz)*rl;
const Vec3vfN Pr = t_o.lower*Vec3vfN(dir);
const Vec3vfN Pl = v0 + u0_o*(v1-v0);
const Vec3vfN R = normalize(Pr-Pl);
const Vec3vfN U = (p1-p0)+(r1-r0)*R;
const Vec3vfN V = cross(p1-p0,R);
Ng0_o = cross(V,U);
}
/* calculates u and Ng for far hit */
{
u1_o = (Oz+t_o.upper*dOz)*rl;
const Vec3vfN Pr = t_o.lower*Vec3vfN(dir);
const Vec3vfN Pl = v0 + u1_o*(v1-v0);
const Vec3vfN R = normalize(Pr-Pl);
const Vec3vfN U = (p1-p0)+(r1-r0)*R;
const Vec3vfN V = cross(p1-p0,R);
Ng1_o = cross(V,U);
}
return valid;
}
__forceinline vbool<N> intersect(const Vec3fa& org, const Vec3fa& dir, BBox<vfloat<N>>& t_o) const
{
vfloat<N> u0_o; Vec3vfN Ng0_o; vfloat<N> u1_o; Vec3vfN Ng1_o;
return intersect(org,dir,t_o,u0_o,Ng0_o,u1_o,Ng1_o);
}
};
}
}
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