290 lines
10 KiB
C++
290 lines
10 KiB
C++
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// Copyright 2009-2020 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "bbox.h"
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#include "range.h"
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namespace embree
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{
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template<typename T>
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__forceinline std::pair<T,T> globalLinear(const std::pair<T,T>& v, const BBox1f& dt)
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{
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const float rcp_dt_size = float(1.0f)/dt.size();
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const T g0 = lerp(v.first,v.second,-dt.lower*rcp_dt_size);
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const T g1 = lerp(v.first,v.second,(1.0f-dt.lower)*rcp_dt_size);
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return std::make_pair(g0,g1);
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}
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template<typename T>
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struct LBBox
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{
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public:
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__forceinline LBBox () {}
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template<typename T1>
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__forceinline LBBox ( const LBBox<T1>& other )
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: bounds0(other.bounds0), bounds1(other.bounds1) {}
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__forceinline LBBox& operator= ( const LBBox& other ) {
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bounds0 = other.bounds0; bounds1 = other.bounds1; return *this;
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}
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__forceinline LBBox (EmptyTy)
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: bounds0(EmptyTy()), bounds1(EmptyTy()) {}
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__forceinline explicit LBBox ( const BBox<T>& bounds)
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: bounds0(bounds), bounds1(bounds) { }
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__forceinline LBBox ( const BBox<T>& bounds0, const BBox<T>& bounds1)
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: bounds0(bounds0), bounds1(bounds1) { }
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LBBox ( const avector<BBox<T>>& bounds )
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{
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assert(bounds.size());
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BBox<T> b0 = bounds.front();
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BBox<T> b1 = bounds.back();
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for (size_t i=1; i<bounds.size()-1; i++) {
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const float f = float(i)/float(bounds.size()-1);
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const BBox<T> bt = lerp(b0,b1,f);
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const T dlower = min(bounds[i].lower-bt.lower,T(zero));
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const T dupper = max(bounds[i].upper-bt.upper,T(zero));
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b0.lower += dlower; b1.lower += dlower;
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b0.upper += dupper; b1.upper += dupper;
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}
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bounds0 = b0;
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bounds1 = b1;
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}
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/*! calculates the linear bounds of a primitive for the specified time range */
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template<typename BoundsFunc>
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__forceinline LBBox(const BoundsFunc& bounds, const BBox1f& time_range, float numTimeSegments)
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{
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const float lower = time_range.lower*numTimeSegments;
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const float upper = time_range.upper*numTimeSegments;
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const float ilowerf = floor(lower);
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const float iupperf = ceil(upper);
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const int ilower = (int)ilowerf;
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const int iupper = (int)iupperf;
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const BBox<T> blower0 = bounds(ilower);
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const BBox<T> bupper1 = bounds(iupper);
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if (iupper-ilower == 1) {
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bounds0 = lerp(blower0, bupper1, lower-ilowerf);
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bounds1 = lerp(bupper1, blower0, iupperf-upper);
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return;
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}
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const BBox<T> blower1 = bounds(ilower+1);
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const BBox<T> bupper0 = bounds(iupper-1);
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BBox<T> b0 = lerp(blower0, blower1, lower-ilowerf);
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BBox<T> b1 = lerp(bupper1, bupper0, iupperf-upper);
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for (int i = ilower+1; i < iupper; i++)
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{
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const float f = (float(i)/numTimeSegments - time_range.lower) / time_range.size();
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const BBox<T> bt = lerp(b0, b1, f);
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const BBox<T> bi = bounds(i);
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const T dlower = min(bi.lower-bt.lower, T(zero));
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const T dupper = max(bi.upper-bt.upper, T(zero));
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b0.lower += dlower; b1.lower += dlower;
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b0.upper += dupper; b1.upper += dupper;
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}
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bounds0 = b0;
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bounds1 = b1;
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}
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/*! calculates the linear bounds of a primitive for the specified time range */
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template<typename BoundsFunc>
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__forceinline LBBox(const BoundsFunc& bounds, const BBox1f& time_range_in, const BBox1f& geom_time_range, float geom_time_segments)
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{
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/* normalize global time_range_in to local geom_time_range */
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const BBox1f time_range((time_range_in.lower-geom_time_range.lower)/geom_time_range.size(),
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(time_range_in.upper-geom_time_range.lower)/geom_time_range.size());
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const float lower = time_range.lower*geom_time_segments;
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const float upper = time_range.upper*geom_time_segments;
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const float ilowerf = floor(lower);
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const float iupperf = ceil(upper);
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const float ilowerfc = max(0.0f,ilowerf);
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const float iupperfc = min(iupperf,geom_time_segments);
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const int ilowerc = (int)ilowerfc;
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const int iupperc = (int)iupperfc;
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assert(iupperc-ilowerc > 0);
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/* this larger iteration range guarantees that we process borders of geom_time_range is (partially) inside time_range_in */
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const int ilower_iter = max(-1,(int)ilowerf);
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const int iupper_iter = min((int)iupperf,(int)geom_time_segments+1);
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const BBox<T> blower0 = bounds(ilowerc);
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const BBox<T> bupper1 = bounds(iupperc);
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if (iupper_iter-ilower_iter == 1) {
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bounds0 = lerp(blower0, bupper1, max(0.0f,lower-ilowerfc));
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bounds1 = lerp(bupper1, blower0, max(0.0f,iupperfc-upper));
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return;
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}
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const BBox<T> blower1 = bounds(ilowerc+1);
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const BBox<T> bupper0 = bounds(iupperc-1);
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BBox<T> b0 = lerp(blower0, blower1, max(0.0f,lower-ilowerfc));
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BBox<T> b1 = lerp(bupper1, bupper0, max(0.0f,iupperfc-upper));
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for (int i = ilower_iter+1; i < iupper_iter; i++)
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{
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const float f = (float(i)/geom_time_segments - time_range.lower) / time_range.size();
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const BBox<T> bt = lerp(b0, b1, f);
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const BBox<T> bi = bounds(i);
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const T dlower = min(bi.lower-bt.lower, T(zero));
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const T dupper = max(bi.upper-bt.upper, T(zero));
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b0.lower += dlower; b1.lower += dlower;
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b0.upper += dupper; b1.upper += dupper;
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}
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bounds0 = b0;
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bounds1 = b1;
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}
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/*! calculates the linear bounds of a primitive for the specified time range */
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template<typename BoundsFunc>
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__forceinline LBBox(const BoundsFunc& bounds, const range<int>& time_range, int numTimeSegments)
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{
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const int ilower = time_range.begin();
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const int iupper = time_range.end();
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BBox<T> b0 = bounds(ilower);
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BBox<T> b1 = bounds(iupper);
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if (iupper-ilower == 1)
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{
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bounds0 = b0;
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bounds1 = b1;
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return;
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}
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for (int i = ilower+1; i<iupper; i++)
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{
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const float f = float(i - time_range.begin()) / float(time_range.size());
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const BBox<T> bt = lerp(b0, b1, f);
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const BBox<T> bi = bounds(i);
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const T dlower = min(bi.lower-bt.lower, T(zero));
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const T dupper = max(bi.upper-bt.upper, T(zero));
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b0.lower += dlower; b1.lower += dlower;
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b0.upper += dupper; b1.upper += dupper;
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}
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bounds0 = b0;
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bounds1 = b1;
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}
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public:
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__forceinline bool empty() const {
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return bounds().empty();
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}
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__forceinline BBox<T> bounds () const {
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return merge(bounds0,bounds1);
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}
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__forceinline BBox<T> interpolate( const float t ) const {
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return lerp(bounds0,bounds1,t);
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}
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__forceinline LBBox<T> interpolate( const BBox1f& dt ) const {
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return LBBox<T>(interpolate(dt.lower),interpolate(dt.upper));
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}
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__forceinline void extend( const LBBox& other ) {
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bounds0.extend(other.bounds0);
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bounds1.extend(other.bounds1);
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}
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__forceinline float expectedHalfArea() const;
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__forceinline float expectedHalfArea(const BBox1f& dt) const {
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return interpolate(dt).expectedHalfArea();
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}
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__forceinline float expectedApproxHalfArea() const {
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return 0.5f*(halfArea(bounds0) + halfArea(bounds1));
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}
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/* calculates bounds for [0,1] time range from bounds in dt time range */
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__forceinline LBBox global(const BBox1f& dt) const
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{
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const float rcp_dt_size = 1.0f/dt.size();
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const BBox<T> b0 = interpolate(-dt.lower*rcp_dt_size);
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const BBox<T> b1 = interpolate((1.0f-dt.lower)*rcp_dt_size);
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return LBBox(b0,b1);
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}
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/*! Comparison Operators */
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//template<typename TT> friend __forceinline bool operator==( const LBBox<TT>& a, const LBBox<TT>& b ) { return a.bounds0 == b.bounds0 && a.bounds1 == b.bounds1; }
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//template<typename TT> friend __forceinline bool operator!=( const LBBox<TT>& a, const LBBox<TT>& b ) { return a.bounds0 != b.bounds0 || a.bounds1 != b.bounds1; }
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friend __forceinline bool operator==( const LBBox& a, const LBBox& b ) { return a.bounds0 == b.bounds0 && a.bounds1 == b.bounds1; }
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friend __forceinline bool operator!=( const LBBox& a, const LBBox& b ) { return a.bounds0 != b.bounds0 || a.bounds1 != b.bounds1; }
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/*! output operator */
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friend __forceinline embree_ostream operator<<(embree_ostream cout, const LBBox& box) {
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return cout << "LBBox { " << box.bounds0 << "; " << box.bounds1 << " }";
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}
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public:
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BBox<T> bounds0, bounds1;
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};
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/*! tests if box is finite */
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template<typename T>
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__forceinline bool isvalid( const LBBox<T>& v ) {
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return isvalid(v.bounds0) && isvalid(v.bounds1);
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}
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template<typename T>
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__forceinline bool isvalid_non_empty( const LBBox<T>& v ) {
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return isvalid_non_empty(v.bounds0) && isvalid_non_empty(v.bounds1);
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}
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template<typename T>
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__forceinline T expectedArea(const T& a0, const T& a1, const T& b0, const T& b1)
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{
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const T da = a1-a0;
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const T db = b1-b0;
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return a0*b0+(a0*db+da*b0)*T(0.5f) + da*db*T(1.0f/3.0f);
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}
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template<> __forceinline float LBBox<Vec3fa>::expectedHalfArea() const
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{
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const Vec3fa d0 = bounds0.size();
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const Vec3fa d1 = bounds1.size();
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return reduce_add(expectedArea(Vec3fa(d0.x,d0.y,d0.z),
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Vec3fa(d1.x,d1.y,d1.z),
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Vec3fa(d0.y,d0.z,d0.x),
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Vec3fa(d1.y,d1.z,d1.x)));
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}
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template<typename T>
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__forceinline float expectedApproxHalfArea(const LBBox<T>& box) {
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return box.expectedApproxHalfArea();
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}
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template<typename T>
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__forceinline LBBox<T> merge(const LBBox<T>& a, const LBBox<T>& b) {
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return LBBox<T>(merge(a.bounds0, b.bounds0), merge(a.bounds1, b.bounds1));
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}
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/*! subset relation */
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template<typename T> __inline bool subset( const LBBox<T>& a, const LBBox<T>& b ) {
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return subset(a.bounds0,b.bounds0) && subset(a.bounds1,b.bounds1);
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}
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/*! default template instantiations */
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typedef LBBox<float> LBBox1f;
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typedef LBBox<Vec2f> LBBox2f;
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typedef LBBox<Vec3f> LBBox3f;
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typedef LBBox<Vec3fa> LBBox3fa;
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typedef LBBox<Vec3fx> LBBox3fx;
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}
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