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)
77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
// Copyright 2009-2021 Intel Corporation
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
#pragma once
|
|
|
|
namespace embree
|
|
{
|
|
namespace isa
|
|
{
|
|
/*! Intersects a ray with a quad with backface culling
|
|
* enabled. The quad v0,v1,v2,v3 is split into two triangles
|
|
* v0,v1,v3 and v2,v3,v1. The edge v1,v2 decides which of the two
|
|
* triangles gets intersected. */
|
|
template<int N>
|
|
__forceinline vbool<N> intersect_quad_backface_culling(const vbool<N>& valid0,
|
|
const Vec3fa& ray_org,
|
|
const Vec3fa& ray_dir,
|
|
const float ray_tnear,
|
|
const float ray_tfar,
|
|
const Vec3vf<N>& quad_v0,
|
|
const Vec3vf<N>& quad_v1,
|
|
const Vec3vf<N>& quad_v2,
|
|
const Vec3vf<N>& quad_v3,
|
|
vfloat<N>& u_o,
|
|
vfloat<N>& v_o,
|
|
vfloat<N>& t_o)
|
|
{
|
|
/* calculate vertices relative to ray origin */
|
|
vbool<N> valid = valid0;
|
|
const Vec3vf<N> O = Vec3vf<N>(ray_org);
|
|
const Vec3vf<N> D = Vec3vf<N>(ray_dir);
|
|
const Vec3vf<N> va = quad_v0-O;
|
|
const Vec3vf<N> vb = quad_v1-O;
|
|
const Vec3vf<N> vc = quad_v2-O;
|
|
const Vec3vf<N> vd = quad_v3-O;
|
|
|
|
const Vec3vf<N> edb = vb-vd;
|
|
const vfloat<N> WW = dot(cross(vd,edb),D);
|
|
const Vec3vf<N> v0 = select(WW <= 0.0f,va,vc);
|
|
const Vec3vf<N> v1 = select(WW <= 0.0f,vb,vd);
|
|
const Vec3vf<N> v2 = select(WW <= 0.0f,vd,vb);
|
|
|
|
/* calculate edges */
|
|
const Vec3vf<N> e0 = v2-v0;
|
|
const Vec3vf<N> e1 = v0-v1;
|
|
|
|
/* perform edge tests */
|
|
const vfloat<N> U = dot(cross(v0,e0),D);
|
|
const vfloat<N> V = dot(cross(v1,e1),D);
|
|
valid &= max(U,V) <= 0.0f;
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* calculate geometry normal and denominator */
|
|
const Vec3vf<N> Ng = cross(e1,e0);
|
|
const vfloat<N> den = dot(Ng,D);
|
|
const vfloat<N> rcpDen = rcp(den);
|
|
|
|
/* perform depth test */
|
|
const vfloat<N> t = rcpDen*dot(v0,Ng);
|
|
valid &= vfloat<N>(ray_tnear) <= t & t <= vfloat<N>(ray_tfar);
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* avoid division by 0 */
|
|
valid &= den != vfloat<N>(zero);
|
|
if (unlikely(none(valid))) return false;
|
|
|
|
/* update hit information */
|
|
t_o = t;
|
|
u_o = U * rcpDen;
|
|
v_o = V * rcpDen;
|
|
u_o = select(WW <= 0.0f,u_o,1.0f-u_o);
|
|
v_o = select(WW <= 0.0f,v_o,1.0f-v_o);
|
|
return valid;
|
|
}
|
|
}
|
|
}
|