Differential D4501 Diff 14126 extern/gltf-draco/draco/src/draco/core/vector_d.h

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extern/gltf-draco/draco/src/draco/core/vector_d.h

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				// Copyright 2016 The Draco Authors.
				//
				// Licensed under the Apache License, Version 2.0 (the "License");
				// you may not use this file except in compliance with the License.
				// You may obtain a copy of the License at
				//
				// http://www.apache.org/licenses/LICENSE-2.0
				//
				// Unless required by applicable law or agreed to in writing, software
				// distributed under the License is distributed on an "AS IS" BASIS,
				// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
				// See the License for the specific language governing permissions and
				// limitations under the License.
				//
				#ifndef DRACO_CORE_VECTOR_D_H_
				#define DRACO_CORE_VECTOR_D_H_

				#include <inttypes.h>
				#include <algorithm>
				#include <array>
				#include <cmath>

				#include "draco/core/macros.h"

				namespace draco {
				// D-dimensional vector class with basic operations.
				template <class CoeffT, int dimension_t>
				class VectorD {
				public:
				typedef VectorD<CoeffT, dimension_t> Self;
				typedef CoeffT CoefficientType;
				static constexpr int dimension = dimension_t;

				VectorD() {
				for (int i = 0; i < dimension_t; ++i)
				(*this)[i] = CoeffT(0);
				}

				// The following constructor does not compile in opt mode, which for now led
				// to the constructors further down, which is not ideal.
				// TODO(hemmer): fix constructor below and remove others.
				// template <typename... Args>
				// explicit VectorD(Args... args) : v_({args...}) {}

				VectorD(const CoeffT &c0, const CoeffT &c1) : v_({{c0, c1}}) {
				DRACO_DCHECK_EQ(dimension_t, 2);
				v_[0] = c0;
				v_[1] = c1;
				}

				VectorD(const CoeffT &c0, const CoeffT &c1, const CoeffT &c2)
				: v_({{c0, c1, c2}}) {
				DRACO_DCHECK_EQ(dimension_t, 3);
				}

				VectorD(const CoeffT &c0, const CoeffT &c1, const CoeffT &c2,
				const CoeffT &c3)
				: v_({{c0, c1, c2, c3}}) {
				DRACO_DCHECK_EQ(dimension_t, 4);
				}

				VectorD(const CoeffT &c0, const CoeffT &c1, const CoeffT &c2,
				const CoeffT &c3, const CoeffT &c4)
				: v_({{c0, c1, c2, c3, c4}}) {
				DRACO_DCHECK_EQ(dimension_t, 5);
				}

				VectorD(const CoeffT &c0, const CoeffT &c1, const CoeffT &c2,
				const CoeffT &c3, const CoeffT &c4, const CoeffT &c5)
				: v_({{c0, c1, c2, c3, c4, c5}}) {
				DRACO_DCHECK_EQ(dimension_t, 6);
				}

				VectorD(const CoeffT &c0, const CoeffT &c1, const CoeffT &c2,
				const CoeffT &c3, const CoeffT &c4, const CoeffT &c5,
				const CoeffT &c6)
				: v_({{c0, c1, c2, c3, c4, c5, c6}}) {
				DRACO_DCHECK_EQ(dimension_t, 7);
				}

				VectorD(const Self &o) {
				for (int i = 0; i < dimension_t; ++i)
				(*this)[i] = o[i];
				}

				CoeffT &operator[](int i) { return v_[i]; }
				const CoeffT &operator[](int i) const { return v_[i]; }
				// TODO(hemmer): remove.
				// Similar to interface of Eigen library.
				CoeffT &operator()(int i) { return v_[i]; }
				const CoeffT &operator()(int i) const { return v_[i]; }

				// Unary operators.
				Self operator-() const {
				Self ret;
				for (int i = 0; i < dimension_t; ++i) {
				ret[i] = -(*this)[i];
				}
				return ret;
				}

				// Binary operators.
				Self operator+(const Self &o) const {
				Self ret;
				for (int i = 0; i < dimension_t; ++i) {
				ret[i] = (*this)[i] + o[i];
				}
				return ret;
				}

				Self operator-(const Self &o) const {
				Self ret;
				for (int i = 0; i < dimension_t; ++i) {
				ret[i] = (*this)[i] - o[i];
				}
				return ret;
				}

				Self operator*(const CoeffT &o) const {
				Self ret;
				for (int i = 0; i < dimension_t; ++i) {
				ret[i] = (this)[i] o;
				}
				return ret;
				}

				Self operator/(const CoeffT &o) const {
				Self ret;
				for (int i = 0; i < dimension_t; ++i) {
				ret[i] = (*this)[i] / o;
				}
				return ret;
				}

				bool operator==(const Self &o) const {
				for (int i = 0; i < dimension_t; ++i) {
				if ((*this)[i] != o[i])
				return false;
				}
				return true;
				}

				bool operator!=(const Self &x) const { return !((*this) == x); }

				bool operator<(const Self &x) const {
				for (int i = 0; i < dimension_t - 1; ++i) {
				if (v_[i] < x.v_[i])
				return true;
				if (v_[i] > x.v_[i])
				return false;
				}
				// Only one check needed for the last dimension.
				if (v_[dimension_t - 1] < x.v_[dimension_t - 1])
				return true;
				return false;
				}

				// Functions.
				CoeffT SquaredNorm() const { return this->Dot(*this); }

				// Computes L1, the sum of absolute values of all entries.
				CoeffT AbsSum() const {
				CoeffT result(0);
				for (int i = 0; i < dimension_t; ++i) {
				result += std::abs(v_[i]);
				}
				return result;
				}

				CoeffT Dot(const Self &o) const {
				CoeffT ret(0);
				for (int i = 0; i < dimension_t; ++i) {
				ret += (this)[i] o[i];
				}
				return ret;
				}

				void Normalize() {
				const CoeffT magnitude = std::sqrt(this->SquaredNorm());
				if (magnitude == 0) {
				return;
				}
				for (int i = 0; i < dimension_t; ++i) {
				(*this)[i] /= magnitude;
				}
				}

				CoeffT *data() { return &(v_[0]); }

				private:
				std::array<CoeffT, dimension_t> v_;
				};

				// Scalar multiplication from the other side too.
				template <class CoeffT, int dimension_t>
				VectorD<CoeffT, dimension_t> operator*(const CoeffT &o,
				const VectorD<CoeffT, dimension_t> &v) {
				return v * o;
				}

				// Calculates the squared distance between two points.
				template <class CoeffT, int dimension_t>
				CoeffT SquaredDistance(const VectorD<CoeffT, dimension_t> &v1,
				const VectorD<CoeffT, dimension_t> &v2) {
				CoeffT difference;
				CoeffT squared_distance = 0;
				// Check each index separately so difference is never negative and underflow
				// is avoided for unsigned types.
				for (int i = 0; i < dimension_t; ++i) {
				if (v1[i] >= v2[i]) {
				difference = v1[i] - v2[i];
				} else {
				difference = v2[i] - v1[i];
				}
				squared_distance += (difference * difference);
				}
				return squared_distance;
				}

				// Global function computing the cross product of two 3D vectors.
				template <class CoeffT>
				VectorD<CoeffT, 3> CrossProduct(const VectorD<CoeffT, 3> &u,
				const VectorD<CoeffT, 3> &v) {
				// Preventing accidental use with uint32_t and the like.
				static_assert(std::is_signed<CoeffT>::value,
				"CoeffT must be a signed type. ");
				VectorD<CoeffT, 3> r;
				r[0] = (u[1] * v[2]) - (u[2] * v[1]);
				r[1] = (u[2] * v[0]) - (u[0] * v[2]);
				r[2] = (u[0] * v[1]) - (u[1] * v[0]);
				return r;
				}

				template <class CoeffT, int dimension_t>
				inline std::ostream &operator<<(
				std::ostream &out, const draco::VectorD<CoeffT, dimension_t> &vec) {
				for (int i = 0; i < dimension_t - 1; ++i) {
				out << vec[i] << " ";
				}
				out << vec[dimension_t - 1];
				return out;
				}

				typedef VectorD<float, 2> Vector2f;
				typedef VectorD<float, 3> Vector3f;
				typedef VectorD<float, 4> Vector4f;
				typedef VectorD<float, 5> Vector5f;
				typedef VectorD<float, 6> Vector6f;
				typedef VectorD<float, 7> Vector7f;

				typedef VectorD<uint32_t, 2> Vector2ui;
				typedef VectorD<uint32_t, 3> Vector3ui;
				typedef VectorD<uint32_t, 4> Vector4ui;
				typedef VectorD<uint32_t, 5> Vector5ui;
				typedef VectorD<uint32_t, 6> Vector6ui;
				typedef VectorD<uint32_t, 7> Vector7ui;

				} // namespace draco

				#endif // DRACO_CORE_VECTOR_D_H_