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1bd2fee414
OpenGl_View - reset Random Number Generator seed on progressive render restart to produce the same visual results.
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// Created on: 2014-07-18
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// Created by: Alexander Malyshev
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// Copyright (c) 2014-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _math_BullardGenerator_HeaderFile
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#define _math_BullardGenerator_HeaderFile
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#include <Standard_Real.hxx>
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//! Fast random number generator (the algorithm proposed by Ian C. Bullard).
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class math_BullardGenerator
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{
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public:
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//! Creates new Xorshift 64-bit RNG.
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math_BullardGenerator (unsigned int theSeed = 1)
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: myStateHi (theSeed)
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{
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SetSeed (theSeed);
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}
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//! Setup new seed / reset defaults.
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void SetSeed (unsigned int theSeed = 1)
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{
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myStateHi = theSeed;
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myStateLo = theSeed ^ 0x49616E42;
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}
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//! Generates new 64-bit integer value.
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unsigned int NextInt()
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{
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myStateHi = (myStateHi >> 2) + (myStateHi << 2);
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myStateHi += myStateLo;
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myStateLo += myStateHi;
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return myStateHi;
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}
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//! Generates new floating-point value.
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Standard_Real NextReal()
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{
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return NextInt() / static_cast<Standard_Real> (0xFFFFFFFFu);
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}
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private:
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unsigned int myStateHi;
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unsigned int myStateLo;
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};
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#endif |