float2.h

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#pragma once

#include <algorithm>
#include <cmath>
#if defined(_WIN32) && !defined(NO_MIN_MAX)
#undef MIN
#undef MAX
#undef min
#undef max
#endif

namespace bvh
{
class float2
{
public:
    float2(float xx = 0.f, float yy = 0.f) : x(xx), y(yy) {}

    float& operator[](int i) { return *(&x + i); }
    float  operator[](int i) const { return *(&x + i); }
    float2 operator-() const { return float2(-x, -y); }

    float sqnorm() const { return x * x + y * y; }
    void  normalize() { (*this) /= (std::sqrt(sqnorm())); }

    float2& operator+=(float2 const& o)
    {
        x += o.x;
        y += o.y;
        return *this;
    }
    float2& operator-=(float2 const& o)
    {
        x -= o.x;
        y -= o.y;
        return *this;
    }
    float2& operator*=(float2 const& o)
    {
        x *= o.x;
        y *= o.y;
        return *this;
    }
    float2& operator*=(float c)
    {
        x *= c;
        y *= c;
        return *this;
    }
    float2& operator/=(float c)
    {
        const float cinv = 1.f / c;
        x *= cinv;
        y *= cinv;
        return *this;
    }

    float x, y;
};

inline float2 operator+(float2 const& v1, float2 const& v2)
{
    float2 res = v1;
    return res += v2;
}

inline float2 operator-(float2 const& v1, float2 const& v2)
{
    float2 res = v1;
    return res -= v2;
}

inline float2 operator*(float2 const& v1, float2 const& v2)
{
    float2 res = v1;
    return res *= v2;
}

inline float2 operator*(float2 const& v1, float c)
{
    float2 res = v1;
    return res *= c;
}

inline float2 operator*(float c, float2 const& v1) { return operator*(v1, c); }

inline float dot(float2 const& v1, float2 const& v2) { return v1.x * v2.x + v1.y * v2.y; }

inline float2 normalize(float2 const& v)
{
    float2 res = v;
    res.normalize();
    return res;
}

inline float2 vmin(float2 const& v1, float2 const& v2) { return float2(std::min(v1.x, v2.x), std::min(v1.y, v2.y)); }

inline float2 vmax(float2 const& v1, float2 const& v2) { return float2(std::max(v1.x, v2.x), std::max(v1.y, v2.y)); }
}  // namespace bvh