sharplib/math/Size3.cs

// Copyright (c) Xenko contributors (https://xenko.com) and Silicon Studio Corp. (https://www.siliconstudio.co.jp)
// Distributed under the MIT license. See the LICENSE.md file in the project root for more information.
//
// Copyright (c) 2010-2013 SharpDX - Alexandre Mutel
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// THE SOFTWARE.

using System;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;

namespace math
{
    /// <summary>
    /// Structure providing Width, Height and Depth.
    /// </summary>
    [DataContract( Name = "!Size3")]
    [DataStyle(DataStyle.Compact)]
    [StructLayout(LayoutKind.Sequential)]
    public struct Size3 : IEquatable<Size3>, IComparable<Size3>
    {
        /// <summary>
        /// A zero size with (width, height, depth) = (0,0,0)
        /// </summary>
        public static readonly Size3 Zero = new Size3(0, 0, 0);

        /// <summary>
        /// A one size with (width, height, depth) = (1,1,1)
        /// </summary>
        public static readonly Size3 One = new Size3(1, 1, 1);

        /// <summary>
        /// A zero size with (width, height, depth) = (0,0,0)
        /// </summary>
        public static readonly Size3 Empty = Zero;

        /// <summary>
        /// Initializes a new instance of the <see cref="Size3" /> struct.
        /// </summary>
        /// <param name="width">The x.</param>
        /// <param name="height">The y.</param>
        /// <param name="depth">The depth.</param>
        public Size3(int width, int height, int depth)
        {
            Width = width;
            Height = height;
            Depth = depth;
        }

        /// <summary>
        /// Width.
        /// </summary>
        [DataMember( Order = 0 )]
        public int Width;

        /// <summary>
        /// Height.
        /// </summary>
        [DataMember( Order = 1 )]
        public int Height;

        /// <summary>
        /// Height.
        /// </summary>
        [DataMember( Order = 2 )]
        public int Depth;

        /// <summary>
        /// Gets a volume size.
        /// </summary>
        private long VolumeSize
        {
            get
            {
                return (long)Width * Height * Depth;
            }
        }

        /// <inheritdoc/>
        public bool Equals(Size3 other)
        {
            return Width == other.Width && Height == other.Height && Depth == other.Depth;
        }

        /// <inheritdoc/>
        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            return obj is Size3 && Equals((Size3)obj);
        }

        /// <inheritdoc/>
        public override int GetHashCode()
        {
            unchecked
            {
                int hashCode = Width;
                hashCode = (hashCode * 397) ^ Height;
                hashCode = (hashCode * 397) ^ Depth;
                return hashCode;
            }
        }

        /// <inheritdoc/>
        public int CompareTo(Size3 other)
        {
            return Math.Sign(this.VolumeSize - other.VolumeSize);
        }

        /// <inheritdoc/>
        public override string ToString()
        {
            return string.Format("({0},{1},{2})", Width, Height, Depth);
        }

        /// <summary>
        /// Implements the &lt;.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator <(Size3 left, Size3 right)
        {
            return left.CompareTo(right) < 0;
        }

        /// <summary>
        /// Implements the &lt;.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator <=(Size3 left, Size3 right)
        {
            return left.CompareTo(right) <= 0;
        }

        /// <summary>
        /// Implements the &lt; or ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator >(Size3 left, Size3 right)
        {
            return left.CompareTo(right) > 0;
        }

        /// <summary>
        /// Implements the &gt; or ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator >=(Size3 left, Size3 right)
        {
            return left.CompareTo(right) >= 0;
        }

        /// <summary>
        /// Implements the ==.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator ==(Size3 left, Size3 right)
        {
            return left.Equals(right);
        }

        /// <summary>
        /// Implements the !=.
        /// </summary>
        /// <param name="left">The left.</param>
        /// <param name="right">The right.</param>
        /// <returns>The result of the operator.</returns>
        public static bool operator !=(Size3 left, Size3 right)
        {
            return !left.Equals(right);
        }

        /// <summary>
        /// Calculates the next up mip-level (*2) of this size.
        /// </summary>
        /// <returns>A next up mip-level Size3.</returns>
        public Size3 Up2(int count = 1)
        {
            if (count < 0)
            {
                throw new ArgumentOutOfRangeException("count", "Must be >= 0");
            }

            return new Size3(Math.Max(1, Width << count), Math.Max(1, Height << count), Math.Max(1, Depth << count));
        }

        /// <summary>
        /// Calculates the next down mip-level (/2) of this size.
        /// </summary>
        /// <param name="count">The count.</param>
        /// <returns>A next down mip-level Size3.</returns>
        public Size3 Down2(int count = 1)
        {
            if (count < 0)
            {
                throw new ArgumentOutOfRangeException("count", "Must be >= 0");
            }

            return new Size3(Math.Max(1, Width >> count), Math.Max(1, Height >> count), Math.Max(1, Depth >> count));
        }

        /// <summary>
        /// Calculates the mip size based on a direction.
        /// </summary>
        /// <param name="direction">The direction &lt; 0 then <see cref="Down2"/>, &gt; 0  then <see cref="Up2"/>, else this unchanged.</param>
        /// <returns>Size3.</returns>
        public Size3 Mip(int direction)
        {
            return direction == 0 ? this : direction < 0 ? Down2() : Up2();
        }
    }
}