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Move FastRandom to LegacyRandom in osu.Game project

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This commit is contained in:
Dean Herbert
2022-04-28 17:46:00 +09:00
parent 027ba17844
commit 93db6c6bb0
8 changed files with 40 additions and 126 deletions
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8
osu.Game.Rulesets.Catch/Beatmaps/CatchBeatmapProcessor.cs
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@ -5,10 +5,10 @@ using System;
using System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Catch.MathUtils;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Catch.Beatmaps
{
@ -46,7 +46,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
public void ApplyPositionOffsets(IBeatmap beatmap)
{
var rng = new FastRandom(RNG_SEED);
var rng = new LegacyRandom(RNG_SEED);
float? lastPosition = null;
double lastStartTime = 0;
@ -98,7 +98,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
initialiseHyperDash(beatmap);
}
private static void applyHardRockOffset(CatchHitObject hitObject, ref float? lastPosition, ref double lastStartTime, FastRandom rng)
private static void applyHardRockOffset(CatchHitObject hitObject, ref float? lastPosition, ref double lastStartTime, LegacyRandom rng)
{
float offsetPosition = hitObject.OriginalX;
double startTime = hitObject.StartTime;
@ -146,7 +146,7 @@ namespace osu.Game.Rulesets.Catch.Beatmaps
/// <param name="position">The position which the offset should be applied to.</param>
/// <param name="maxOffset">The maximum offset, cannot exceed 20px.</param>
/// <param name="rng">The random number generator.</param>
private static void applyRandomOffset(ref float position, double maxOffset, FastRandom rng)
private static void applyRandomOffset(ref float position, double maxOffset, LegacyRandom rng)
{
bool right = rng.NextBool();
float rand = Math.Min(20, (float)rng.Next(0, Math.Max(0, maxOffset)));

99
osu.Game.Rulesets.Catch/MathUtils/FastRandom.cs
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@ -1,99 +0,0 @@
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
namespace osu.Game.Rulesets.Catch.MathUtils
{
/// <summary>
/// A PRNG specified in http://heliosphan.org/fastrandom.html.
/// </summary>
public class FastRandom
{
private const double int_to_real = 1.0 / (int.MaxValue + 1.0);
private const uint int_mask = 0x7FFFFFFF;
private const uint y_initial = 842502087;
private const uint z_initial = 3579807591;
private const uint w_initial = 273326509;
private uint x, y = y_initial, z = z_initial, w = w_initial;
public FastRandom(int seed)
{
x = (uint)seed;
}
public FastRandom()
: this(Environment.TickCount)
{
}
/// <summary>
/// Generates a random unsigned integer within the range [<see cref="uint.MinValue"/>, <see cref="uint.MaxValue"/>).
/// </summary>
/// <returns>The random value.</returns>
public uint NextUInt()
{
uint t = x ^ (x << 11);
x = y;
y = z;
z = w;
return w = w ^ (w >> 19) ^ t ^ (t >> 8);
}
/// <summary>
/// Generates a random integer value within the range [0, <see cref="int.MaxValue"/>).
/// </summary>
/// <returns>The random value.</returns>
public int Next() => (int)(int_mask & NextUInt());
/// <summary>
/// Generates a random integer value within the range [0, <paramref name="upperBound"/>).
/// </summary>
/// <param name="upperBound">The upper bound.</param>
/// <returns>The random value.</returns>
public int Next(int upperBound) => (int)(NextDouble() * upperBound);
/// <summary>
/// Generates a random integer value within the range [<paramref name="lowerBound"/>, <paramref name="upperBound"/>).
/// </summary>
/// <param name="lowerBound">The lower bound of the range.</param>
/// <param name="upperBound">The upper bound of the range.</param>
/// <returns>The random value.</returns>
public int Next(int lowerBound, int upperBound) => (int)(lowerBound + NextDouble() * (upperBound - lowerBound));
/// <summary>
/// Generates a random integer value within the range [<paramref name="lowerBound"/>, <paramref name="upperBound"/>).
/// </summary>
/// <param name="lowerBound">The lower bound of the range.</param>
/// <param name="upperBound">The upper bound of the range.</param>
/// <returns>The random value.</returns>
public int Next(double lowerBound, double upperBound) => (int)(lowerBound + NextDouble() * (upperBound - lowerBound));
/// <summary>
/// Generates a random double value within the range [0, 1).
/// </summary>
/// <returns>The random value.</returns>
public double NextDouble() => int_to_real * Next();
private uint bitBuffer;
private int bitIndex = 32;
/// <summary>
/// Generates a reandom boolean value. Cached such that a random value is only generated once in every 32 calls.
/// </summary>
/// <returns>The random value.</returns>
public bool NextBool()
{
if (bitIndex == 32)
{
bitBuffer = NextUInt();
bitIndex = 1;
return (bitBuffer & 1) == 1;
}
bitIndex++;
return ((bitBuffer >>= 1) & 1) == 1;
}
}
}