diff options
author | /dev/humancontroller <devhc@example.com> | 2015-03-28 01:21:52 +0100 |
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committer | /dev/humancontroller <devhc@example.com> | 2017-01-26 07:16:57 +0100 |
commit | e9d273f7b0544b03e4d73e1078b2755fef0e05f7 (patch) | |
tree | 4fa9863c0a41a444a0afc145411480ced8e4351d /src/SDL2/include/SDL_bits.h | |
parent | f45fbef604e05144057dec8d1dbfc5d4f5a2a822 (diff) |
remove most libraries from the source tree
Diffstat (limited to 'src/SDL2/include/SDL_bits.h')
-rw-r--r-- | src/SDL2/include/SDL_bits.h | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/src/SDL2/include/SDL_bits.h b/src/SDL2/include/SDL_bits.h deleted file mode 100644 index 341524fd..00000000 --- a/src/SDL2/include/SDL_bits.h +++ /dev/null @@ -1,97 +0,0 @@ -/* - Simple DirectMedia Layer - Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org> - - This software is provided 'as-is', without any express or implied - warranty. In no event will the authors be held liable for any damages - arising from the use of this software. - - Permission is granted to anyone to use this software for any purpose, - including commercial applications, and to alter it and redistribute it - freely, subject to the following restrictions: - - 1. The origin of this software must not be misrepresented; you must not - claim that you wrote the original software. If you use this software - in a product, an acknowledgment in the product documentation would be - appreciated but is not required. - 2. Altered source versions must be plainly marked as such, and must not be - misrepresented as being the original software. - 3. This notice may not be removed or altered from any source distribution. -*/ - -/** - * \file SDL_bits.h - * - * Functions for fiddling with bits and bitmasks. - */ - -#ifndef _SDL_bits_h -#define _SDL_bits_h - -#include "SDL_stdinc.h" - -#include "begin_code.h" -/* Set up for C function definitions, even when using C++ */ -#ifdef __cplusplus -extern "C" { -#endif - -/** - * \file SDL_bits.h - */ - -/** - * Get the index of the most significant bit. Result is undefined when called - * with 0. This operation can also be stated as "count leading zeroes" and - * "log base 2". - * - * \return Index of the most significant bit, or -1 if the value is 0. - */ -SDL_FORCE_INLINE int -SDL_MostSignificantBitIndex32(Uint32 x) -{ -#if defined(__GNUC__) && __GNUC__ >= 4 - /* Count Leading Zeroes builtin in GCC. - * http://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Other-Builtins.html - */ - if (x == 0) { - return -1; - } - return 31 - __builtin_clz(x); -#else - /* Based off of Bit Twiddling Hacks by Sean Eron Anderson - * <seander@cs.stanford.edu>, released in the public domain. - * http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog - */ - const Uint32 b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000}; - const int S[] = {1, 2, 4, 8, 16}; - - int msbIndex = 0; - int i; - - if (x == 0) { - return -1; - } - - for (i = 4; i >= 0; i--) - { - if (x & b[i]) - { - x >>= S[i]; - msbIndex |= S[i]; - } - } - - return msbIndex; -#endif -} - -/* Ends C function definitions when using C++ */ -#ifdef __cplusplus -} -#endif -#include "close_code.h" - -#endif /* _SDL_bits_h */ - -/* vi: set ts=4 sw=4 expandtab: */ |