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https://github.com/UberGuidoZ/Flipper.git
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77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
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/*
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* Copyright 2019 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CARDBOARD_SDK_UTIL_VECTORUTILS_H_
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#define CARDBOARD_SDK_UTIL_VECTORUTILS_H_
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//
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// This file contains free functions that operate on Vector instances.
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//
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#include <cmath>
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#include "vector.h"
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namespace cardboard {
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// Returns the dot (inner) product of two Vectors.
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double Dot(const Vector<3>& v0, const Vector<3>& v1);
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// Returns the dot (inner) product of two Vectors.
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double Dot(const Vector<4>& v0, const Vector<4>& v1);
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// Returns the 3-dimensional cross product of 2 Vectors. Note that this is
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// defined only for 3-dimensional Vectors.
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Vector<3> Cross(const Vector<3>& v0, const Vector<3>& v1);
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// Returns the square of the length of a Vector.
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template <int Dimension>
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double LengthSquared(const Vector<Dimension>& v) {
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return Dot(v, v);
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}
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// Returns the geometric length of a Vector.
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template <int Dimension>
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double Length(const Vector<Dimension>& v) {
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return sqrt(LengthSquared(v));
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}
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// the Vector untouched and returns false.
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template <int Dimension>
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bool Normalize(Vector<Dimension>* v) {
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const double len = Length(*v);
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if(len == 0) {
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return false;
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} else {
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(*v) /= len;
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return true;
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}
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}
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// Returns a unit-length version of a Vector. If the given Vector has no
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// length, this returns a Zero() Vector.
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template <int Dimension>
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Vector<Dimension> Normalized(const Vector<Dimension>& v) {
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Vector<Dimension> result = v;
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if(Normalize(&result))
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return result;
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else
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return Vector<Dimension>::Zero();
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}
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} // namespace cardboard
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#endif // CARDBOARD_SDK_UTIL_VECTORUTILS_H_
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