sdf_r8.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "snorm_r8.hpp"
#include "math.hpp"
 
namespace tt {
 
struct sdf_r8 : public snorm_r8 {
    constexpr static float max_distance = 3.0f;
    constexpr static float one_over_max_distance = 1.0f / max_distance;
 
    sdf_r8() noexcept = default;
    sdf_r8(sdf_r8 const &other) noexcept = default;
    sdf_r8(sdf_r8 &&other) noexcept = default;
    sdf_r8 &operator=(sdf_r8 const &other) noexcept = default;
    sdf_r8 &operator=(sdf_r8 &&other) noexcept = default;
    ~sdf_r8() = default;
 
    sdf_r8(float rhs) noexcept :
        snorm_r8(rhs * one_over_max_distance) {}
 
    sdf_r8 &operator=(float rhs) noexcept {
        snorm_r8::operator=(rhs * one_over_max_distance);
        return *this;
    }
 
    operator float () const noexcept {
        return (snorm_r8::operator float()) * max_distance;
    }
 
    void repair() noexcept {
        *this = -static_cast<float>(*this);
    }
};
 
}