hedgewars/uRandom.pas
author unc0rr
Tue, 09 Oct 2012 21:08:37 +0400
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permissions -rw-r--r--
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2012 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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{$INCLUDE "options.inc"}
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unit uRandom;
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(*
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 * This unit supplies platform-independent functions for getting various
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 * pseudo-random values based on a shared seed.
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 *
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 * This is necessary for accomplishing pseudo-random behavior in the game
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 * without causing a desynchronisation of different clients when playing over
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 * a network.
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 *)
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interface
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uses uFloat;
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procedure SetRandomSeed(Seed: shortstring); // Sets the seed that should be used for generating pseudo-random values.
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function  GetRandomf: hwFloat; overload; // Returns a pseudo-random hwFloat.
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function  GetRandom(m: LongWord): LongWord; overload; inline; // Returns a positive pseudo-random integer smaller than m.
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procedure AddRandomness(r: LongWord); inline;
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function  rndSign(num: hwFloat): hwFloat; // Returns num with a random chance of having a inverted sign.
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implementation
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var cirbuf: array[0..63] of Longword;
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    n: byte;
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procedure AddRandomness(r: LongWord); inline;
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begin
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n:= (n + 1) and $3F;
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cirbuf[n]:= cirbuf[n] xor r
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end;
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function GetNext: Longword; inline;
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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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GetNext:= 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
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    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]);
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for i:= Length(Seed) to 54 do
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    cirbuf[i]:= $A98765 + 68; // odd number
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for i:= 0 to 1023 do
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    GetNext
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end;
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function GetRandomf: hwFloat;
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begin
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GetNext;
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GetRandomf.isNegative:= false;
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GetRandomf.QWordValue:= GetNext
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end;
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function GetRandom(m: LongWord): LongWord; inline;
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begin
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GetNext;
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GetRandom:= GetNext mod m
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end;
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function rndSign(num: hwFloat): hwFloat;
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begin
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num.isNegative:= odd(GetNext);
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rndSign:= num
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end;
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end.