SDF8.hpp

// Copyright 2019 Pokitec
// All rights reserved.
 
#pragma once
 
#include "TTauri/Foundation/R8SNorm.hpp"
#include "TTauri/Foundation/math.hpp"
 
namespace tt {
 
struct SDF8 : public R8SNorm {
    constexpr static float max_distance = 3.0f;
    constexpr static float one_over_max_distance = 1.0f / max_distance;
 
    SDF8() noexcept = default;
    SDF8(SDF8 const &other) noexcept = default;
    SDF8(SDF8 &&other) noexcept = default;
    SDF8 &operator=(SDF8 const &other) noexcept = default;
    SDF8 &operator=(SDF8 &&other) noexcept = default;
    ~SDF8() = default;
 
    SDF8(float rhs) noexcept :
        R8SNorm(rhs * one_over_max_distance) {}
 
    SDF8 &operator=(float rhs) noexcept {
        R8SNorm::operator=(rhs * one_over_max_distance);
        return *this;
    }
 
    operator float () const noexcept {
        return (R8SNorm::operator float()) * max_distance;
    }
 
    void repair() noexcept {
        *this = -static_cast<float>(*this);
    }
};
 
}