/* Copyright (C) 2010-2020 The RetroArch team * * --------------------------------------------------------------------------------------- * The following license statement only applies to this file (retro_math.h). * --------------------------------------------------------------------------------------- * * Permission is hereby granted, free of charge, * to any person obtaining a copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef _LIBRETRO_COMMON_MATH_H #define _LIBRETRO_COMMON_MATH_H #include <stdint.h> #if defined(_WIN32) && !defined(_XBOX) #define WIN32_LEAN_AND_MEAN #include <windows.h> #elif defined(_WIN32) && defined(_XBOX) #include <Xtl.h> #endif #include <limits.h> #ifdef _MSC_VER #include <compat/msvc.h> #endif #include <retro_inline.h> #ifndef M_PI #if !defined(USE_MATH_DEFINES) #define M_PI 3.14159265358979323846264338327 #endif #endif #ifndef MAX #define MAX(a, b) ((a) > (b) ? (a) : (b)) #endif #ifndef MIN #define MIN(a, b) ((a) < (b) ? (a) : (b)) #endif /** * next_pow2: * @v : initial value * * Get next power of 2 value based on initial value. * * Returns: next power of 2 value (derived from @v). **/ static INLINE uint32_t next_pow2(uint32_t v) { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; v++; return v; } /** * prev_pow2: * @v : initial value * * Get previous power of 2 value based on initial value. * * Returns: previous power of 2 value (derived from @v). **/ static INLINE uint32_t prev_pow2(uint32_t v) { v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; return v - (v >> 1); } #endif