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7d89a42b56
SourceSDK mathlib port with light modifications. Renamed Vector to Vector3D (to avoid confusion with std::vector (declared as vector) and Vector2D/Vector4D).
57 lines
994 B
C++
57 lines
994 B
C++
//========= 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 "core/stdafx.h"
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#include "mathlib/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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