56 lines
951 B
C++
56 lines
951 B
C++
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//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=====================================================================================//
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#include <halton.h>
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// NOTE: This has to be the last file included!
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#include "tier0/memdbgon.h"
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HaltonSequenceGenerator_t::HaltonSequenceGenerator_t(int b)
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{
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base=b;
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fbase=(float) b;
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seed=1;
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}
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float HaltonSequenceGenerator_t::GetElement(int elem)
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{
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int tmpseed=seed;
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float ret=0.0;
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float base_inv=1.0/fbase;
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while(tmpseed)
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{
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int dig=tmpseed % base;
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ret+=((float) dig)*base_inv;
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base_inv/=fbase;
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tmpseed/=base;
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}
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return ret;
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}
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int InsideOut( int nTotal, int nCounter )
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{
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int b = 0;
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for ( int m = nTotal, k = 1; k < nTotal; k <<= 1 )
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{
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if ( nCounter << 1 >= m )
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{
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b += k;
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nCounter -= ( m + 1 ) >> 1;
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m >>= 1;
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}
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else
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{
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m = ( m + 1 ) >> 1;
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}
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}
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Assert( ( b >= 0 ) && ( b < nTotal ) );
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return b;
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}
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