sdf_r8.hpp

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// Copyright Take Vos 2020-2022.
// 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 "../utility/utility.hpp"
#include "../macros.hpp"
#include <bit>
#include <cstdint>
 
hi_export_module(hikogui.image.sdf_r8);
 
hi_warning_push();
// C26434: Function '...' hides a non-virtual function '...'.
// We need to hide those functions.
hi_warning_ignore_msvc(26434);
 
hi_export namespace hi::inline v1 {

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);
    }
};
 
} // namespace hi::inline v1
 
hi_warning_pop();