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Berk
2b6bd5a532
* [audio] added sdl audio backend and in-tree atrac9 decoder * [input] replaced per-platform pad readers with sdl gamepad input * [video] added sdl window and host display plumbing * [gui] added host display options and per-game render settings * [bink] synced host movie playback to the guest audio clock * [cpu] hooked windows write faults into guest image tracking * [perf] added guest and render profiling, reserved host cpu lanes * [kernel] fixed stale pthread mutex handle alias * [host] wired the sdl session, save-data paths and project references * [audio] hoisted ajm trace stackalloc out of its loop * [video] Add guest image sync setting * [build] Strip native symbols * reuse
36 lines
947 B
C#
36 lines
947 B
C#
// SPDX-License-Identifier: MIT
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#nullable disable
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namespace LibAtrac9
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{
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/// <summary>
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/// An Xorshift RNG used by the ATRAC9 codec
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/// </summary>
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internal class Atrac9Rng
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{
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private ushort _stateA;
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private ushort _stateB;
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private ushort _stateC;
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private ushort _stateD;
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public Atrac9Rng(ushort seed)
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{
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int startValue = 0x4D93 * (seed ^ (seed >> 14));
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_stateA = (ushort)(3 - startValue);
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_stateB = (ushort)(2 - startValue);
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_stateC = (ushort)(1 - startValue);
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_stateD = (ushort)(0 - startValue);
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}
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public ushort Next()
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{
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ushort t = (ushort)(_stateD ^ (_stateD << 5));
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_stateD = _stateC;
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_stateC = _stateB;
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_stateB = _stateA;
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_stateA = (ushort)(t ^ _stateA ^ ((t ^ (_stateA >> 5)) >> 4));
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return _stateA;
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}
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}
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}
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