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100 lines
3.1 KiB
100 lines
3.1 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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/***************************************************************************** |
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* |
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* $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtMath.h |
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* |
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***/ |
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#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTMATH_H |
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#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtMath.h included more than once" |
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#endif |
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#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTMATH_H |
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/***************************************************************************** |
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* |
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* Calling conventions |
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* |
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***/ |
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#ifdef _M_IX86 |
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#define MATHCALL __fastcall |
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#else |
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#define MATHCALL |
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#endif |
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/***************************************************************************** |
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* |
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* Bit manipulation functions |
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* |
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***/ |
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unsigned MATHCALL MathLowBitPos (dword val); |
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unsigned MATHCALL MathHighBitPos (dword val); |
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//=========================================================================== |
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inline unsigned MathBitCount (dword val) { |
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val = val - ((val >> 1) & 033333333333) - ((val >> 2) & 011111111111); |
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val = ((val + (val >> 3)) & 030707070707); |
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val = val + (val >> 6); |
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val = (val + (val >> 12) + (val >> 24)) & 077; |
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return val; |
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} |
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//=========================================================================== |
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inline unsigned MathBitMaskCreate (unsigned count) { |
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ASSERT(count <= 8 * sizeof(unsigned)); |
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return count ? ((2 << (count - 1)) - 1) : 0; |
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} |
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//=========================================================================== |
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inline dword MathHighBitValue (dword val) { |
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return val ? 1 << MathHighBitPos(val) : 0; |
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} |
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//=========================================================================== |
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inline bool MathIsPow2 (unsigned val) { |
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return !(val & (val - 1)); |
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} |
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//=========================================================================== |
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inline unsigned MathLowBitValue (unsigned val) { |
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return val & ~(val - 1); |
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} |
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//=========================================================================== |
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inline unsigned MathNextMultiplePow2 (unsigned val, unsigned multiple) { |
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ASSERT(multiple); |
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ASSERT(MathIsPow2(multiple)); |
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return (val + (multiple - 1)) & ~(multiple - 1); |
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} |
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//=========================================================================== |
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inline dword MathNextPow2 (dword val) { |
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return MathIsPow2(val) ? val : 1 << (MathHighBitPos(val) + 1); |
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}
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