mirror of
https://github.com/libretro/RetroArch
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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* Copyright (C) 2010-2017 The RetroArch team
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*
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* ---------------------------------------------------------------------------------------
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* The following license statement only applies to this file (retro_math.h).
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* ---------------------------------------------------------------------------------------
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*
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* Permission is hereby granted, free of charge,
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* to any person obtaining a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef _LIBRETRO_COMMON_MATH_H
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#define _LIBRETRO_COMMON_MATH_H
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#include <stdint.h>
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#if defined(_WIN32) && !defined(_XBOX)
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#elif defined(_WIN32) && defined(_XBOX)
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#include <Xtl.h>
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#endif
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#include <limits.h>
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#ifdef _MSC_VER
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#include <compat/msvc.h>
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#endif
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#include <retro_inline.h>
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#ifndef M_PI
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#if !defined(USE_MATH_DEFINES)
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#define M_PI 3.14159265358979323846264338327
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#endif
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#endif
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#ifndef MAX
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#endif
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#ifndef MIN
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#endif
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/**
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* next_pow2:
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* @v : initial value
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*
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* Get next power of 2 value based on initial value.
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*
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* Returns: next power of 2 value (derived from @v).
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**/
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static INLINE uint32_t next_pow2(uint32_t v)
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{
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v--;
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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v++;
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return v;
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}
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/**
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* prev_pow2:
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* @v : initial value
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*
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* Get previous power of 2 value based on initial value.
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*
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* Returns: previous power of 2 value (derived from @v).
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**/
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static INLINE uint32_t prev_pow2(uint32_t v)
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{
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v |= v >> 1;
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v |= v >> 2;
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v |= v >> 4;
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v |= v >> 8;
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v |= v >> 16;
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return v - (v >> 1);
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}
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#endif
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