123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//
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// vector2.h
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// Kraken Engine / Hydra
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//
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// Copyright 2022 Kearwood Gilbert. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KEARWOOD GILBERT OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// The views and conclusions contained in the software and documentation are those of the
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// authors and should not be interpreted as representing official policies, either expressed
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// or implied, of Kearwood Gilbert.
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//
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#ifndef KRAKEN_VECTOR2_H
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#define KRAKEN_VECTOR2_H
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#include <functional> // for hash<>
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#include <limits> // for std::numeric_limits<>
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#include <math.h> // for sqrtf
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namespace kraken {
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class Vector2 {
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public:
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union {
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struct {
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float x, y;
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};
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float c[2];
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};
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void init();
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void init(float X, float Y);
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void init(float v);
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void init(float *v);
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void init(const Vector2 &v);
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static Vector2 Create();
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static Vector2 Create(float X, float Y);
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static Vector2 Create(float v);
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static Vector2 Create(float *v);
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static Vector2 Create(const Vector2 &v);
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// Vector2 swizzle getters
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Vector2 yx() const;
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// Vector2 swizzle setters
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void yx(const Vector2 &v);
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Vector2 operator +(const Vector2& b) const;
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Vector2 operator -(const Vector2& b) const;
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Vector2 operator +() const;
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Vector2 operator -() const;
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Vector2 operator *(const float v) const;
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Vector2 operator /(const float v) const;
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Vector2& operator +=(const Vector2& b);
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Vector2& operator -=(const Vector2& b);
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Vector2& operator *=(const float v);
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Vector2& operator /=(const float v);
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// Comparison operators are implemented to allow insertion into sorted containers such as std::set
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bool operator >(const Vector2& b) const;
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bool operator <(const Vector2& b) const;
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bool operator ==(const Vector2& b) const;
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bool operator !=(const Vector2& b) const;
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float& operator[](unsigned i);
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float operator[](unsigned i) const;
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float sqrMagnitude() const;
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float magnitude() const;
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void normalize();
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static Vector2 Normalize(const Vector2 &v);
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static float Cross(const Vector2 &v1, const Vector2 &v2);
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static float Dot(const Vector2 &v1, const Vector2 &v2);
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static Vector2 Min(const Vector2 &v1, const Vector2 &v2);
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static Vector2 Max(const Vector2 &v1, const Vector2 &v2);
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static Vector2 Min();
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static Vector2 Max();
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static Vector2 Zero();
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static Vector2 One();
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};
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static_assert(std::is_pod<Vector2>::value, "kraken::Vector2 must be a POD type.");
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} // namespace kraken
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namespace std {
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template<>
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struct hash<kraken::Vector2> {
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public:
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size_t operator()(const kraken::Vector2 &s) const
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{
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size_t h1 = hash<float>()(s.x);
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size_t h2 = hash<float>()(s.y);
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return h1 ^ (h2 << 1);
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}
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};
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} // namespace std
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#endif // KRAKEN_VECTOR2_H
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