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Code Issues Releases Wiki Activity

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)));

8
osu.Game.Rulesets.Mania/Beatmaps/ManiaBeatmapConverter.cs
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@ -11,8 +11,8 @@ using osu.Game.Beatmaps;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Mania.Beatmaps.Patterns;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy;
using osu.Game.Utils;
using osuTK;
namespace osu.Game.Rulesets.Mania.Beatmaps
@ -31,7 +31,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
private readonly int originalTargetColumns;
// Internal for testing purposes
internal FastRandom Random { get; private set; }
internal LegacyRandom Random { get; private set; }
private Pattern lastPattern = new Pattern();
@ -84,7 +84,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
IBeatmapDifficultyInfo difficulty = original.Difficulty;
int seed = (int)MathF.Round(difficulty.DrainRate + difficulty.CircleSize) * 20 + (int)(difficulty.OverallDifficulty * 41.2) + (int)MathF.Round(difficulty.ApproachRate);
Random = new FastRandom(seed);
Random = new LegacyRandom(seed);
return base.ConvertBeatmap(original, cancellationToken);
}
@ -227,7 +227,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps
/// </summary>
private class SpecificBeatmapPatternGenerator : Patterns.Legacy.PatternGenerator
{
public SpecificBeatmapPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
public SpecificBeatmapPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
: base(random, hitObject, beatmap, previousPattern, originalBeatmap)
{
}

4
osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/DistanceObjectPatternGenerator.cs
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@ -8,12 +8,12 @@ using System.Linq;
using osu.Framework.Extensions.EnumExtensions;
using osu.Game.Audio;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Beatmaps.Formats;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
{
@ -34,7 +34,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
private PatternType convertType;
public DistanceObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
public DistanceObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
: base(random, hitObject, beatmap, previousPattern, originalBeatmap)
{
convertType = PatternType.None;

4
osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/EndTimeObjectPatternGenerator.cs
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@ -2,13 +2,13 @@
// See the LICENCE file in the repository root for full licence text.
using System.Collections.Generic;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using System.Linq;
using osu.Game.Audio;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
{
@ -17,7 +17,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
private readonly int endTime;
private readonly PatternType convertType;
public EndTimeObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
public EndTimeObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
: base(random, hitObject, beatmap, previousPattern, originalBeatmap)
{
endTime = (int)((HitObject as IHasDuration)?.EndTime ?? 0);

4
osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/HitObjectPatternGenerator.cs
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@ -9,11 +9,11 @@ using osuTK;
using osu.Game.Audio;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
{
@ -23,7 +23,7 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
private readonly PatternType convertType;
public HitObjectPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, double previousTime, Vector2 previousPosition, double density,
public HitObjectPatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, double previousTime, Vector2 previousPosition, double density,
PatternType lastStair, IBeatmap originalBeatmap)
: base(random, hitObject, beatmap, previousPattern, originalBeatmap)
{

6
osu.Game.Rulesets.Mania/Beatmaps/Patterns/Legacy/PatternGenerator.cs
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@ -5,8 +5,8 @@ using System;
using System.Linq;
using JetBrains.Annotations;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Objects;
using osu.Game.Utils;
namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
{
@ -23,14 +23,14 @@ namespace osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy
/// <summary>
/// The random number generator to use.
/// </summary>
protected readonly FastRandom Random;
protected readonly LegacyRandom Random;
/// <summary>
/// The beatmap which <see cref="HitObject"/> is being converted from.
/// </summary>
protected readonly IBeatmap OriginalBeatmap;
protected PatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
protected PatternGenerator(LegacyRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
: base(hitObject, beatmap, previousPattern)
{
if (random == null) throw new ArgumentNullException(nameof(random));

95
osu.Game.Rulesets.Mania/MathUtils/FastRandom.cs
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@ -1,95 +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.Mania.MathUtils
{
/// <summary>
/// A PRNG specified in http://heliosphan.org/fastrandom.html.
/// </summary>
internal class FastRandom
{
private const double int_to_real = 1.0 / (int.MaxValue + 1.0);
private const uint int_mask = 0x7FFFFFFF;
private const uint y = 842502087;
private const uint z = 3579807591;
private const uint w = 273326509;
internal uint X { get; private set; }
internal uint Y { get; private set; } = y;
internal uint Z { get; private set; } = z;
internal uint W { get; private set; } = w;
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 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;
}
}
}

37
osu.Game.Rulesets.Catch/MathUtils/FastRandom.cs → osu.Game/Utils/LegacyRandom.cs
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@ -2,27 +2,36 @@
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Framework.Utils;
namespace osu.Game.Rulesets.Catch.MathUtils
namespace osu.Game.Utils
{
/// <summary>
/// A PRNG specified in http://heliosphan.org/fastrandom.html.
/// Should only be used to match legacy behaviour. See <see cref="RNG"/> for a newer alternative.
/// </summary>
public class FastRandom
/// <remarks>
/// Known in osu-stable code as `FastRandom`.
/// </remarks>
public class LegacyRandom
{
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;
private const uint y = 842502087;
private const uint z = 3579807591;
private const uint w = 273326509;
public FastRandom(int seed)
public uint X { get; private set; }
public uint Y { get; private set; } = y;
public uint Z { get; private set; } = z;
public uint W { get; private set; } = w;
public LegacyRandom(int seed)
{
x = (uint)seed;
X = (uint)seed;
}
public FastRandom()
public LegacyRandom()
: this(Environment.TickCount)
{
}
@ -33,11 +42,11 @@ namespace osu.Game.Rulesets.Catch.MathUtils
/// <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);
uint t = X ^ (X << 11);
X = Y;
Y = Z;
Z = W;
return W = W ^ (W >> 19) ^ t ^ (t >> 8);
}
/// <summary>