96 lines
2.4 KiB
ObjectPascal
96 lines
2.4 KiB
ObjectPascal
{
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Apophysis Copyright (C) 2001-2004 Mark Townsend
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Apophysis Copyright (C) 2005-2006 Ronald Hordijk, Piotr Borys, Peter Sdobnov
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Apophysis Copyright (C) 2007-2008 Piotr Borys, Peter Sdobnov
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Apophysis "3D hack" Copyright (C) 2007-2008 Peter Sdobnov
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Apophysis "7X" Copyright (C) 2009-2010 Georg Kiehne
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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; either version 2 of the License, or
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(at your option) any later version.
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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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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This module is (c) Jed Kelsey and originally created for Apophysis JK 2.10.
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}
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unit AsmRandom;
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interface
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procedure AsmRandInt;
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procedure AsmRandExt;
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procedure AsmRandomize;
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var
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RandSeed: Longint = 0; { Base for random number generator }
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implementation
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const
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advapi32 = 'advapi32.dll';
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kernel = 'kernel32.dll';
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function QueryPerformanceCounter(var lpPerformanceCount: Int64): LongBool; stdcall;
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external kernel name 'QueryPerformanceCounter';
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function GetTickCount: Cardinal;
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external kernel name 'GetTickCount';
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procedure AsmRandomize;
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{$IFDEF LINUX}
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begin
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RandSeed := _time(nil);
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end;
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{$ENDIF}
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{$IFDEF MSWINDOWS}
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var
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Counter: Int64;
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begin
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if QueryPerformanceCounter(Counter) then
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RandSeed := Counter
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else
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RandSeed := GetTickCount;
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end;
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{$ENDIF}
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procedure AsmRandInt;
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asm
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{ ->EAX Range }
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{ <-EAX Result }
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IMUL EDX,RandSeed,08088405H
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INC EDX
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MOV RandSeed,EDX
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MUL EDX
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MOV EAX,EDX
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end;
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procedure AsmRandExt;
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const two2neg32: double = ((1.0/$10000) / $10000); // 2^-32
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asm
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{ FUNCTION _RandExt: Extended; }
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IMUL EDX,RandSeed,08088405H
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INC EDX
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MOV RandSeed,EDX
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FLD two2neg32
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PUSH 0
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PUSH EDX
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FILD qword ptr [ESP]
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ADD ESP,8
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FMULP ST(1), ST(0)
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end;
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end.
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