summaryrefslogtreecommitdiff
path: root/src/SDL2/include/SDL_bits.h
diff options
context:
space:
mode:
Diffstat (limited to 'src/SDL2/include/SDL_bits.h')
-rw-r--r--src/SDL2/include/SDL_bits.h97
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: */