author | sheepluva |
Wed, 19 Oct 2011 21:14:21 +0200 | |
changeset 6152 | aa9f9b034e00 |
parent 5123 | b0b57f247e02 |
child 6580 | 6155187bf599 |
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) 2004-2011 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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||
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{$INCLUDE "options.inc"} |
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||
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unit uRandom; |
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(* |
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* This unit supplies platform-independent functions for getting various |
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* pseudo-random values based on a shared seed. |
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* |
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* This is necessary for accomplishing pseudo-random behavior in the game |
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* without causing a desynchronisation of different clients when playing over |
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* a network. |
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*) |
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interface |
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uses uFloat; |
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{$INCLUDE "config.inc"} |
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procedure initModule; |
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procedure freeModule; |
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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 GetRandom: hwFloat; overload; // Returns a pseudo-random hwFloat. |
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function GetRandom(m: LongWord): LongWord; overload; // Returns a positive pseudo-random integer smaller than m. |
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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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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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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 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 GetNext |
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end; |
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function GetRandom: hwFloat; |
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begin |
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GetNext; |
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GetRandom.isNegative:= false; |
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GetRandom.QWordValue:= GetNext |
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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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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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procedure initModule; |
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begin |
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n:= 54; |
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FillChar(cirbuf, 64*sizeof(Longword), 0); |
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end; |
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procedure freeModule; |
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begin |
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end; |
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end. |