hedgewars/uRandom.pas
author unc0rr
Tue, 20 Jun 2006 21:18:49 +0000
changeset 66 9643d75baf1e
parent 22 517be8dc5b76
child 102 c45643d3fd78
permissions -rw-r--r--
Many AI improvements, bots do think in separate thread
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
4
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     1
(*
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     2
 * Hedgewars, a worms-like game
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     3
 * Copyright (c) 2004, 2005 Andrey Korotaev <unC0Rr@gmail.com>
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     4
 *
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     5
 * Distributed under the terms of the BSD-modified licence:
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     6
 *
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     7
 * Permission is hereby granted, free of charge, to any person obtaining a copy
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     8
 * of this software and associated documentation files (the "Software"), to deal
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
     9
 * with the Software without restriction, including without limitation the
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    10
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    11
 * sell copies of the Software, and to permit persons to whom the Software is
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    12
 * furnished to do so, subject to the following conditions:
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    13
 *
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    14
 * 1. Redistributions of source code must retain the above copyright notice,
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    15
 *    this list of conditions and the following disclaimer.
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    16
 * 2. Redistributions in binary form must reproduce the above copyright notice,
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    17
 *    this list of conditions and the following disclaimer in the documentation
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    18
 *    and/or other materials provided with the distribution.
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    19
 * 3. The name of the author may not be used to endorse or promote products
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    20
 *    derived from this software without specific prior written permission.
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    21
 *
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    22
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    23
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    24
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    25
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    26
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    27
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    28
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    29
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    30
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    31
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    32
 *)
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    33
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    34
unit uRandom;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    35
interface
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    36
uses uSHA;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    37
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    38
procedure SetRandomParams(Seed: shortstring; FillBuf: shortstring);
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    39
function  GetRandom: real; overload;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    40
function  GetRandom(m: LongWord): LongWord; overload;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    41
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    42
implementation
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    43
var  sc1, sc2: TSHA1Context;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    44
     Fill: shortstring;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    45
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    46
procedure SetRandomParams(Seed: shortstring; FillBuf: shortstring);
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    47
begin
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    48
SHA1Init(sc1);
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    49
SHA1Update(sc1, @Seed, Length(Seed)+1);
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    50
Fill:= FillBuf
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    51
end;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    52
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    53
function GetRandom: real;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    54
var dig: TSHA1Digest;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    55
begin
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    56
SHA1Update(sc1, @Fill[1], Length(Fill));
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    57
sc2:= sc1;
21
dff476dcaaa3 - Many improvements to frontend
unc0rr
parents: 5
diff changeset
    58
dig:= SHA1Final(sc2);
4
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    59
Result:= frac( dig.LongWords[0]*0.0000731563977
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    60
               + pi * dig.Words[6]
21
dff476dcaaa3 - Many improvements to frontend
unc0rr
parents: 5
diff changeset
    61
               + 0.0109070019*dig.Words[9])
4
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    62
end;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    63
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    64
function  GetRandom(m: LongWord): LongWord;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    65
var dig: TSHA1Digest;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    66
begin
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    67
SHA1Update(sc1, @Fill[1], Length(Fill));
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    68
sc2:= sc1;
22
517be8dc5b76 - Fixed spawning boxes under water
unc0rr
parents: 21
diff changeset
    69
dig:= SHA1Final(sc2);
517be8dc5b76 - Fixed spawning boxes under water
unc0rr
parents: 21
diff changeset
    70
Result:= (dig.LongWords[0] + dig.LongWords[2] + dig.LongWords[3]) mod m
4
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    71
end;
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    72
bcbd7adb4e4b - set svn:eol-style to native
unc0rr
parents: 1
diff changeset
    73
end.