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240 lines
8 KiB
C++
240 lines
8 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#if !defined(RTHWIF_STANDALONE)
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#include "../common/scene.h"
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#endif
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#include "../builders/primref.h"
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namespace embree
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{
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namespace isa
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{
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template<size_t N>
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__forceinline void splitPolygon(const BBox3fa& bounds,
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const size_t dim,
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const float pos,
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const Vec3fa (&v)[N+1],
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BBox3fa& left_o,
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BBox3fa& right_o)
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{
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BBox3fa left = empty, right = empty;
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/* clip triangle to left and right box by processing all edges */
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for (size_t i=0; i<N; i++)
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{
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const Vec3fa &v0 = v[i];
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const Vec3fa &v1 = v[i+1];
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const float v0d = v0[dim];
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const float v1d = v1[dim];
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if (v0d <= pos) left. extend(v0); // this point is on left side
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if (v0d >= pos) right.extend(v0); // this point is on right side
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if ((v0d < pos && pos < v1d) || (v1d < pos && pos < v0d)) // the edge crosses the splitting location
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{
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assert((v1d-v0d) != 0.0f);
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const float inv_length = 1.0f/(v1d-v0d);
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const Vec3fa c = madd(Vec3fa((pos-v0d)*inv_length),v1-v0,v0);
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left.extend(c);
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right.extend(c);
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}
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}
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/* clip against current bounds */
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left_o = intersect(left,bounds);
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right_o = intersect(right,bounds);
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}
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template<size_t N>
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__forceinline void splitPolygon(const BBox3fa& bounds,
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const size_t dim,
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const float pos,
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const Vec3fa (&v)[N+1],
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const Vec3fa (&inv_length)[N],
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BBox3fa& left_o,
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BBox3fa& right_o)
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{
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BBox3fa left = empty, right = empty;
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/* clip triangle to left and right box by processing all edges */
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for (size_t i=0; i<N; i++)
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{
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const Vec3fa &v0 = v[i];
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const Vec3fa &v1 = v[i+1];
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const float v0d = v0[dim];
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const float v1d = v1[dim];
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if (v0d <= pos) left. extend(v0); // this point is on left side
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if (v0d >= pos) right.extend(v0); // this point is on right side
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if ((v0d < pos && pos < v1d) || (v1d < pos && pos < v0d)) // the edge crosses the splitting location
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{
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assert((v1d-v0d) != 0.0f);
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const Vec3fa c = madd(Vec3fa((pos-v0d)*inv_length[i][dim]),v1-v0,v0);
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left.extend(c);
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right.extend(c);
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}
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}
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/* clip against current bounds */
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left_o = intersect(left,bounds);
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right_o = intersect(right,bounds);
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}
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template<size_t N>
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__forceinline void splitPolygon(const PrimRef& prim,
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const size_t dim,
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const float pos,
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const Vec3fa (&v)[N+1],
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PrimRef& left_o,
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PrimRef& right_o)
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{
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BBox3fa left = empty, right = empty;
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for (size_t i=0; i<N; i++)
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{
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const Vec3fa &v0 = v[i];
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const Vec3fa &v1 = v[i+1];
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const float v0d = v0[dim];
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const float v1d = v1[dim];
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if (v0d <= pos) left. extend(v0); // this point is on left side
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if (v0d >= pos) right.extend(v0); // this point is on right side
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if ((v0d < pos && pos < v1d) || (v1d < pos && pos < v0d)) // the edge crosses the splitting location
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{
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assert((v1d-v0d) != 0.0f);
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const float inv_length = 1.0f/(v1d-v0d);
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const Vec3fa c = madd(Vec3fa((pos-v0d)*inv_length),v1-v0,v0);
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left.extend(c);
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right.extend(c);
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}
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}
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/* clip against current bounds */
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new (&left_o ) PrimRef(intersect(left ,prim.bounds()),prim.geomID(), prim.primID());
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new (&right_o) PrimRef(intersect(right,prim.bounds()),prim.geomID(), prim.primID());
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}
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#if !defined(RTHWIF_STANDALONE)
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struct TriangleSplitter
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{
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__forceinline TriangleSplitter(const Scene* scene, const PrimRef& prim)
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{
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const unsigned int mask = 0xFFFFFFFF >> RESERVED_NUM_SPATIAL_SPLITS_GEOMID_BITS;
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const TriangleMesh* mesh = (const TriangleMesh*) scene->get(prim.geomID() & mask );
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TriangleMesh::Triangle tri = mesh->triangle(prim.primID());
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v[0] = mesh->vertex(tri.v[0]);
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v[1] = mesh->vertex(tri.v[1]);
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v[2] = mesh->vertex(tri.v[2]);
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v[3] = mesh->vertex(tri.v[0]);
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inv_length[0] = Vec3fa(1.0f) / (v[1]-v[0]);
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inv_length[1] = Vec3fa(1.0f) / (v[2]-v[1]);
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inv_length[2] = Vec3fa(1.0f) / (v[0]-v[2]);
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}
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__forceinline void operator() (const PrimRef& prim, const size_t dim, const float pos, PrimRef& left_o, PrimRef& right_o) const {
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splitPolygon<3>(prim,dim,pos,v,left_o,right_o);
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}
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__forceinline void operator() (const BBox3fa& prim, const size_t dim, const float pos, BBox3fa& left_o, BBox3fa& right_o) const {
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splitPolygon<3>(prim,dim,pos,v,inv_length,left_o,right_o);
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}
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private:
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Vec3fa v[4];
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Vec3fa inv_length[3];
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};
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struct TriangleSplitterFactory
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{
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__forceinline TriangleSplitterFactory(const Scene* scene)
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: scene(scene) {}
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__forceinline TriangleSplitter operator() (const PrimRef& prim) const {
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return TriangleSplitter(scene,prim);
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}
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private:
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const Scene* scene;
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};
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struct QuadSplitter
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{
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__forceinline QuadSplitter(const Scene* scene, const PrimRef& prim)
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{
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const unsigned int mask = 0xFFFFFFFF >> RESERVED_NUM_SPATIAL_SPLITS_GEOMID_BITS;
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const QuadMesh* mesh = (const QuadMesh*) scene->get(prim.geomID() & mask );
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QuadMesh::Quad quad = mesh->quad(prim.primID());
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v[0] = mesh->vertex(quad.v[1]);
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v[1] = mesh->vertex(quad.v[2]);
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v[2] = mesh->vertex(quad.v[3]);
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v[3] = mesh->vertex(quad.v[0]);
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v[4] = mesh->vertex(quad.v[1]);
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v[5] = mesh->vertex(quad.v[3]);
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inv_length[0] = Vec3fa(1.0f) / (v[1] - v[0]);
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inv_length[1] = Vec3fa(1.0f) / (v[2] - v[1]);
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inv_length[2] = Vec3fa(1.0f) / (v[3] - v[2]);
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inv_length[3] = Vec3fa(1.0f) / (v[4] - v[3]);
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inv_length[4] = Vec3fa(1.0f) / (v[5] - v[4]);
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}
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__forceinline void operator() (const PrimRef& prim, const size_t dim, const float pos, PrimRef& left_o, PrimRef& right_o) const {
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splitPolygon<5>(prim,dim,pos,v,left_o,right_o);
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}
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__forceinline void operator() (const BBox3fa& prim, const size_t dim, const float pos, BBox3fa& left_o, BBox3fa& right_o) const {
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splitPolygon<5>(prim,dim,pos,v,inv_length,left_o,right_o);
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}
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private:
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Vec3fa v[6];
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Vec3fa inv_length[5];
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};
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struct QuadSplitterFactory
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{
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__forceinline QuadSplitterFactory(const Scene* scene)
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: scene(scene) {}
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__forceinline QuadSplitter operator() (const PrimRef& prim) const {
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return QuadSplitter(scene,prim);
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}
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private:
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const Scene* scene;
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};
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struct DummySplitter
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{
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__forceinline DummySplitter(const Scene* scene, const PrimRef& prim)
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{
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}
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__forceinline void operator() (const PrimRef& prim, const size_t dim, const float pos, PrimRef& left_o, PrimRef& right_o) const {
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}
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__forceinline void operator() (const BBox3fa& prim, const size_t dim, const float pos, BBox3fa& left_o, BBox3fa& right_o) const {
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}
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};
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struct DummySplitterFactory
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{
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__forceinline DummySplitterFactory(const Scene* scene)
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: scene(scene) {}
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__forceinline DummySplitter operator() (const PrimRef& prim) const {
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return DummySplitter(scene,prim);
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}
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private:
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const Scene* scene;
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};
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#endif
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}
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}
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