hedgewars/uRandom.pas
author unc0rr
Thu, 05 Oct 2006 16:33:18 +0000
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Relicense to GPL
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(*
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 * Hedgewars, a worms-like game
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 * Copyright (c) 2004-2006 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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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.  See the
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 * GNU General Public License for more details.
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 *
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 *)
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unit uRandom;
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interface
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{$INCLUDE options.inc}
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procedure SetRandomSeed(Seed: shortstring);
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function  GetRandom: Double; overload;
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function  GetRandom(m: LongWord): LongWord; overload;
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implementation
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var cirbuf: array[0..63] of Longword;
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    n: byte = 54;
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function GetNext: Longword;
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begin
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n:= (n + 1) and $3F;
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cirbuf[n]:=
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           (cirbuf[(n + 40) and $3F] +           {n - 24 mod 64}
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            cirbuf[(n +  9) and $3F])            {n - 55 mod 64}
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            and $7FFFFFFF;                       {mod 2^31}
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Result:= cirbuf[n]
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end;
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procedure SetRandomSeed(Seed: shortstring);
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var i: Longword;
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begin
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n:= 54;
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if Length(Seed) > 54 then Seed:= copy(Seed, 1, 54); // not 55 to ensure we have odd numbers in cirbuf
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for i:= 0 to pred(Length(Seed)) do
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    cirbuf[i]:= byte(Seed[i + 1]) * (i + 1);
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for i:= Length(Seed) to 54 do
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    cirbuf[i]:= i * 7 + 1;
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for i:= 0 to 1023 do GetNext
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end;
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function GetRandom: Double;
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begin
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Result:= frac( GetNext * 0.00073 + GetNext * 0.00301)
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end;
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function GetRandom(m: LongWord): LongWord;
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begin
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GetNext;
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Result:= GetNext mod m
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end;
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end.