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28 lines
898 B
C++
28 lines
898 B
C++
//-----------------------------------------------------------------------------
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// V12 Engine
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//
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// Copyright (c) 2001 GarageGames.Com
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// Portions Copyright (c) 2001 by Sierra Online, Inc.
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//-----------------------------------------------------------------------------
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#include "Core/BitTables.h"
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bool BitTables::mTablesBuilt = false;
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S8 BitTables::mHighBit[256];
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S8 BitTables::mWhichOn[256][8];
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S8 BitTables::mNumOn[256];
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static BitTables sBuildTheTables; // invoke ctor first-time work
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BitTables::BitTables()
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{
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if(! mTablesBuilt){
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// This code only happens once - it relies on the tables being clear.
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for( U32 byte = 0; byte < 256; byte++ )
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for( U32 bit = 0; bit < 8; bit++ )
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if( byte & (1 << bit) )
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mHighBit[byte] = (mWhichOn[byte][mNumOn[byte]++] = bit) + 1;
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mTablesBuilt = true;
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}
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}
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