159 lines
3.3 KiB
C++
159 lines
3.3 KiB
C++
#pragma once
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#include "math.hpp"
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#include "vec.hpp"
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//
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// vec3
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//
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template <typename T>
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struct vec<2, T>
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{
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union {
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struct { T x, y; };
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struct { T u, v; };
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};
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inline constexpr vec();
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inline constexpr vec(T scalar);
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inline constexpr vec(T _x, T _y);
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constexpr inline vec<2, T> operator-() const;
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inline constexpr T const& operator[](int i) const;
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inline constexpr vec<2, T>& operator=(vec<2, T> const& v);
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inline constexpr vec<2, T>& operator+=(vec<2, T> const& v);
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inline constexpr vec<2, T>& operator-=(vec<2, T> const& v);
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};
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template <typename T>
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inline constexpr vec<2, T>::vec()
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: x(0), y(0)
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{}
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template <typename T>
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inline constexpr vec<2, T>::vec(T scalar)
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: x(scalar), y(scalar)
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{}
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template <typename T>
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inline constexpr vec<2, T>::vec(T _x, T _y)
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: x(_x), y(_y)
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{}
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template <typename T>
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constexpr inline vec<2, T> vec<2, T>::operator-() const
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{
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return vec<2, T>(-x, -y);
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}
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template <typename T>
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inline constexpr T const& vec<2, T>::operator[](int i) const
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{
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switch(i)
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{
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default: [[fallthrough]];
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case 0: return x;
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case 1: return y;
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}
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}
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template <typename T>
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inline constexpr vec<2, T>& vec<2, T>::operator=(vec<2, T> const& v)
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{
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this->x = static_cast<T>(v.x);
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this->y = static_cast<T>(v.y);
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return *this;
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}
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template <typename T>
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inline constexpr vec<2, T>& vec<2, T>::operator+=(vec<2, T> const& v)
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{
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*this = *this + vec<2, T>(v);
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return *this;
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}
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template <typename T>
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inline constexpr vec<2, T>& vec<2, T>::operator-=(vec<2, T> const& v)
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{
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*this = *this - vec<2, T>(v);
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return *this;
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}
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template <typename T>
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inline constexpr vec<2, T> operator+(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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return vec<2, T>(v1.x + v2.x,
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v1.y + v2.y);
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}
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template <typename T>
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inline constexpr vec<2, T> operator-(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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return vec<2, T>(v1.x - v2.x,
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v1.y - v2.y);
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}
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template <typename T>
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inline constexpr vec<2, T> operator*(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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return vec<2, T>(v1.x * v2.x,
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v1.y * v2.y);
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}
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template <typename T>
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inline constexpr vec<2, T> operator*(vec<2, T> const& v1, T const& scalar)
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{
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return v1 * vec<2, T>(scalar);
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}
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template <typename T>
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inline constexpr vec<2, T> operator*(T const& scalar, vec<2, T> const& v1)
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{
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return vec<2, T>(scalar) * v1;
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}
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template <typename T>
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inline constexpr vec<2, T> operator/(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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return vec<2, T>(v1.x / v2.x,
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v1.y / v2.y);
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}
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template <typename T>
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inline constexpr vec<2, T> operator/(vec<2, T> const& v1, T const& scalar)
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{
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return v1 / vec<2, T>(scalar);
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}
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template <typename T>
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inline constexpr T dot(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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vec<2, T> tmp(v1 * v2);
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return tmp.x + tmp.y;
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}
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template <typename T>
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inline constexpr T cross(vec<2, T> const& v1, vec<2, T> const& v2)
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{
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return v1.x * v2.y - v2.x * v1.y;
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}
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template <typename T>
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inline constexpr vec<2, T> functor1(T (&func) (T const& x), vec<2, T> const& v)
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{
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return vec<2, T>(func(v.x), func(v.y));
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}
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template <typename T, typename U>
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inline constexpr vec<2, U> functor1(U (&func) (T const& x), vec<2, T> const& v)
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{
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return vec<2, U>(func(v.x), func(v.y));
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}
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template <typename T>
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inline constexpr T magnitude(vec<2, T> const& v)
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{
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return sqrt(dot(v, v));
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}
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