hedgewars/uRandom.pas
author nemo
Tue, 02 Dec 2014 16:45:26 -0500
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(*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2014 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  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; dropAdditionalPart: boolean); // Sets the seed that should be used for generating pseudo-random values.
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function  GetRandomf: hwFloat; // Returns a pseudo-random hwFloat.
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function  GetRandom(m: LongWord): LongWord; 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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var s : string;
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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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   str(GetNext, s);
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end;
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procedure SetRandomSeed(Seed: shortstring; dropAdditionalPart: boolean);
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var i, t, l: 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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t:= 0;
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l:= Length(Seed);
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while (t < l) and ((not dropAdditionalPart) or (Seed[t + 1] <> '|')) do
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    begin
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    cirbuf[t]:= byte(Seed[t + 1]);
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    inc(t)
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    end;
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for i:= t 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.