uid issue

mathlib/halton.cpp

@@ -0,0 +1,55 @@
+//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=====================================================================================//
+
+#include <halton.h>
+
+// NOTE: This has to be the last file included!
+#include "tier0/memdbgon.h"
+
+
+HaltonSequenceGenerator_t::HaltonSequenceGenerator_t(int b)
+{
+	base=b;
+	fbase=(float) b;
+	seed=1;
+
+}
+
+float HaltonSequenceGenerator_t::GetElement(int elem)
+{
+	int tmpseed=seed;
+	float ret=0.0;
+	float base_inv=1.0/fbase;
+	while(tmpseed)
+	{
+		int dig=tmpseed % base;
+		ret+=((float) dig)*base_inv;
+		base_inv/=fbase;
+		tmpseed/=base;
+	}
+	return ret;
+}
+
+
+int InsideOut( int nTotal, int nCounter )
+{
+    int b = 0;
+	for ( int m = nTotal, k = 1; k < nTotal; k <<= 1 )
+	{
+		if ( nCounter << 1 >= m )
+		{
+			b += k;
+			nCounter -= ( m + 1 ) >> 1;
+			m >>= 1;
+		}
+		else 
+		{
+			m = ( m + 1 ) >> 1;
+		}
+	}
+	Assert( ( b >= 0 ) && ( b < nTotal ) );
+	return b;
+}