Remove Qt SVG and Qt OpenGL as hard dependencies
Qt SVG is not used in the frontend (no SVGs are rendered).
Neither is Qt OpenGL used. Qt OpenGL is discouraged anyway.
(*
* Hedgewars, a free turn based strategy game
* Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*)
{$INCLUDE "options.inc"}
unit uRandom;
(*
* This unit supplies platform-independent functions for getting various
* pseudo-random values based on a shared seed.
*
* This is necessary for accomplishing pseudo-random behavior in the game
* without causing a desynchronisation of different clients when playing over
* a network.
*)
interface
uses uFloat;
procedure SetRandomSeed(Seed: shortstring; dropAdditionalPart: boolean); // Sets the seed that should be used for generating pseudo-random values.
function GetRandomf: hwFloat; // Returns a pseudo-random hwFloat.
function GetRandom(m: LongWord): LongWord; inline; // Returns a positive pseudo-random integer smaller than m.
procedure AddRandomness(r: LongWord); inline;
function rndSign(num: hwFloat): hwFloat; // Returns num with a random chance of having a inverted sign.
implementation
var cirbuf: array[0..63] of Longword;
n: byte;
procedure AddRandomness(r: LongWord); inline;
begin
n:= (n + 1) and $3F;
cirbuf[n]:= cirbuf[n] xor r;
end;
function GetNext: Longword; inline;
begin
n:= (n + 1) and $3F;
cirbuf[n]:=
(cirbuf[(n + 40) and $3F] + {n - 24 mod 64}
cirbuf[(n + 9) and $3F]) {n - 55 mod 64}
and $7FFFFFFF; {mod 2^31}
GetNext:= cirbuf[n];
end;
procedure SetRandomSeed(Seed: shortstring; dropAdditionalPart: boolean);
var i, t, l: Longword;
begin
n:= 54;
if Length(Seed) > 54 then
Seed:= copy(Seed, 1, 54); // not 55 to ensure we have odd numbers in cirbuf
t:= 0;
l:= Length(Seed);
while (t < l) and ((not dropAdditionalPart) or (Seed[t + 1] <> '|')) do
begin
cirbuf[t]:= byte(Seed[t + 1]);
inc(t)
end;
for i:= t to 54 do
cirbuf[i]:= $A98765 + 68; // odd number
for i:= 0 to 1023 do
GetNext;
end;
function GetRandomf: hwFloat;
begin
GetNext;
GetRandomf.isNegative:= false;
GetRandomf.QWordValue:= GetNext
end;
function GetRandom(m: LongWord): LongWord; inline;
begin
GetNext;
GetRandom:= GetNext mod m
end;
function rndSign(num: hwFloat): hwFloat;
begin
num.isNegative:= odd(GetNext);
rndSign:= num
end;
end.