mirror of
https://github.com/ZDoom/raze-gles.git
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90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
//-------------------------------------------------------------------------
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/*
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Copyright (C) 2010-2019 EDuke32 developers and contributors
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Copyright (C) 2019 sirlemonhead, Nuke.YKT
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This file is part of PCExhumed.
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PCExhumed is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License version 2
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//-------------------------------------------------------------------------
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#include "ns.h"
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#include "random.h"
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#include "exhumed.h"
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BEGIN_PS_NS
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int randA = 0;
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int randB = 0x11111111;
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int randC = 0x1010101;
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static SavegameHelper sgh("rand",
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SV(randA),
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SV(randB),
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SV(randC),
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nullptr);
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void InitRandom()
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{
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randA = 0;
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randB = 0x11111111;
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randC = 0x1010101;
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}
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// TODO - checkme
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int RandomBit()
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{
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randA = (randA >> 1) | (((randA ^ ((randA >> 1) ^ (randA >> 2) ^ (randA >> 31) ^ (randA >> 6) ^ (randA >> 4))) & 1) << 31);
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randB = (randB >> 1) | ((((randB >> 2) ^ (randB >> 30)) & 1) << 30);
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randC = (randC >> 1) | ((((randC >> 1) ^ (randC >> 28)) & 1) << 28);
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return (((randA == 0) & randC) | (randB & randA)) & 1;
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}
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char RandomByte()
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{
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char randByte = RandomBit() << 7;
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randByte |= RandomBit() << 6;
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randByte |= RandomBit() << 5;
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randByte |= RandomBit() << 4;
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randByte |= RandomBit() << 3;
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randByte |= RandomBit() << 2;
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randByte |= RandomBit() << 1;
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randByte |= RandomBit();
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return randByte;
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}
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uint16_t RandomWord()
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{
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short randWord = RandomByte() << 8;
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randWord |= RandomByte();
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return randWord;
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}
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int RandomLong()
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{
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int randLong = RandomWord() << 16;
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randLong |= RandomWord();
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return randLong;
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}
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int RandomSize(int nSize)
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{
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int randSize = 0;
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while (nSize > 0)
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{
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randSize = randSize * 2 | RandomBit();
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nSize--;
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}
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return randSize;
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}
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END_PS_NS
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