mirror of https://gitlab.com/rnger/amath
85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/******************************************************************************
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Copyright (c) 2014 Ryan Juckett
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http://www.ryanjuckett.com/
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*******************************************************************************
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Copyright (c) 2015-2017 Carsten Sonne Larsen <cs@innolan.dk>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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The original source code can be obtained from:
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http://www.ryanjuckett.com/
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******************************************************************************/
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#ifndef RJX_DMATH_H
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#define RJX_DMATH_H
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/**
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* @file dmath.h
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* @brief Math used in the Dragon4 library
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*
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*/
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#include "dstandard.h"
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//******************************************************************************
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// Get the log base 2 of a 32-bit unsigned integer.
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// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogLookup
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//******************************************************************************
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tU32 LogBase2( tU32 val );
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//******************************************************************************
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// Get the log base 2 of a 64-bit unsigned integer.
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//******************************************************************************
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inline tU32 LogBase2( tU64 val )
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{
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tU64 temp;
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temp = val >> 32;
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if (temp)
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return 32 + LogBase2((tU32)temp);
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return LogBase2((tU32)val);
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}
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#endif
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