author | unc0rr |
Tue, 31 Mar 2015 22:37:04 +0300 | |
changeset 10879 | 9bedbd36de49 |
parent 10108 | c68cf030eded |
child 11046 | 47a8c19ecb60 |
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) 2004-2014 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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10108
c68cf030eded
update FSF address. note: two sdl include files (by Sam Lantinga) still have the old FSF address in their copyright - but I ain't gonna touch their copyright headers
sheepluva
parents:
10015
diff
changeset
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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procedure SetRandomSeed(Seed: shortstring; dropAdditionalPart: boolean); // Sets the seed that should be used for generating pseudo-random values. |
9168
20ff80421736
Some fixes to make pas2c+clang compile all engine files
unc0rr
parents:
9127
diff
changeset
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34 |
function GetRandomf: hwFloat; // Returns a pseudo-random hwFloat. |
20ff80421736
Some fixes to make pas2c+clang compile all engine files
unc0rr
parents:
9127
diff
changeset
|
35 |
function GetRandom(m: LongWord): LongWord; inline; // Returns a positive pseudo-random integer smaller than m. |
7389
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
36 |
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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|
7389
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
39 |
|
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implementation |
3295 | 41 |
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var cirbuf: array[0..63] of Longword; |
2699
249adefa9c1c
replace initialization/finalization statements with custom init functions
koda
parents:
2630
diff
changeset
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43 |
n: byte; |
4 | 44 |
|
7389
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
45 |
procedure AddRandomness(r: LongWord); inline; |
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
46 |
begin |
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
47 |
n:= (n + 1) and $3F; |
8026
4a4f21070479
merge xymeng's gsoc engine with a few updates (and further checks on symbol definitions)
koda
parents:
7579
diff
changeset
|
48 |
cirbuf[n]:= cirbuf[n] xor r; |
7389
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
49 |
end; |
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
50 |
|
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
51 |
function GetNext: Longword; inline; |
8026
4a4f21070479
merge xymeng's gsoc engine with a few updates (and further checks on symbol definitions)
koda
parents:
7579
diff
changeset
|
52 |
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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136 | 59 |
|
8026
4a4f21070479
merge xymeng's gsoc engine with a few updates (and further checks on symbol definitions)
koda
parents:
7579
diff
changeset
|
60 |
GetNext:= cirbuf[n]; |
4a4f21070479
merge xymeng's gsoc engine with a few updates (and further checks on symbol definitions)
koda
parents:
7579
diff
changeset
|
61 |
str(GetNext, s); |
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end; |
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||
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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; |
155
401f4ea24715
Engine can generate land preview and send it via IPC
unc0rr
parents:
136
diff
changeset
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68 |
|
6580
6155187bf599
A partial reformatting of the pascal code to have consistent syntax. Things that are still inconsistent.
lovelacer
parents:
5123
diff
changeset
|
69 |
if Length(Seed) > 54 then |
6155187bf599
A partial reformatting of the pascal code to have consistent syntax. Things that are still inconsistent.
lovelacer
parents:
5123
diff
changeset
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70 |
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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4665
fa7ad5f3725f
Make basic training solvable again. Freeze RNG at current version for less of this kind of issue in future, and a bit more savable of seeds. Disable offsets in preparation for release.
nemo
parents:
4363
diff
changeset
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cirbuf[i]:= $A98765 + 68; // odd number |
130 | 83 |
|
6580
6155187bf599
A partial reformatting of the pascal code to have consistent syntax. Things that are still inconsistent.
lovelacer
parents:
5123
diff
changeset
|
84 |
for i:= 0 to 1023 do |
8026
4a4f21070479
merge xymeng's gsoc engine with a few updates (and further checks on symbol definitions)
koda
parents:
7579
diff
changeset
|
85 |
GetNext; |
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end; |
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||
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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; |
94 |
||
7389
15c3fb4882df
Sorry about the slight delay in pickup. You can blame a few lame cheaters. This is to make their cheating a bit harder.
nemo
parents:
7043
diff
changeset
|
95 |
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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||
915 | 101 |
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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||
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end. |