snorm_r8.hpp

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// Copyright Take Vos 2021.
// 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 "../utility/utility.hpp"
#include "../macros.hpp"
#include <algorithm>
#include <cmath>
#include <bit>
#include <cstdint>
 
hi_export_module(hikogui.image.snorm_r8);
 
hi_export namespace hi::inline v1 {
 
[[nodiscard]] constexpr int8_t make_snorm_r8_value(float rhs) noexcept
{
    return round_cast<int8_t>(std::round(std::clamp(rhs, -1.0f, 1.0f) * 127.0f));
}

struct snorm_r8 {
    int8_t value;
 
    snorm_r8() = default;
    snorm_r8(snorm_r8 const &rhs) noexcept = default;
    snorm_r8(snorm_r8 &&rhs) noexcept = default;
    snorm_r8 &operator=(snorm_r8 const &rhs) noexcept = default;
    snorm_r8 &operator=(snorm_r8 &&rhs) noexcept = default;
    ~snorm_r8() = default;
 
    explicit snorm_r8(float rhs) noexcept : value(make_snorm_r8_value(rhs)) {}
 
    snorm_r8 &operator=(float rhs) noexcept
    {
        value = make_snorm_r8_value(rhs);
        return *this;
    }
 
    explicit operator float() const noexcept
    {
        return narrow_cast<float>(value) / 127.0f;
    }
};
 
} // namespace hi::inline v1