q3rally/engine/code/SDL2/include-2.0.22/SDL_bits.h
Zack Middleton 22a0949a26 ioquake3 resync to commit 4610a240 from bc8737d7
Upgrade to build and run from VS2019
Upgrades to Xcode project and Apple Silicon support
Update SDL2 to 2.0.14
Updated SDL2 include files to fix Mac build in GitHub Actions
Added another mention of arm64 to command line help
Restored original opus sse files, excluded from Xcode
Added arm64 to the post-build symlinking step
Merge branch 'main' into xcode
Merge branch 'main' into vs2019
Added shell script to compile Universal 2 binary (x86_64+arm64)
Reverting alert style to deprecated methods
Upgrades to Xcode project and Apple Silicon support
Update SDL2 to 2.0.14
Added another mention of arm64 to command line help
Restored original opus sse files, excluded from Xcode
Added arm64 to the post-build symlinking step
Added shell script to compile Universal 2 binary (x86_64+arm64)
Reverting alert style to deprecated methods
Merge branch 'xcode' of https://github.com/tomkidd/ioq3 into xcode
Removed signature from SDL dylib, enabled dark mode on macOS.
spaces > tabs
Ad-hoc signed libSDL2-2.0.0.dylib
Fix compiling against SDL 2.0.17
UB2 now signs and notarizes, upgraded to SDL 2.0.16
Architectures in libSDL2 restored for ppc and i386
Merge remote-tracking branch 'upstream/main' into vs2019
Update SDL2 to 2.0.16
Added rudimentary support for automatically finding Microsoft Store version of Quake 3
GHA deprecated Ubuntu 16.04 - update to 18.04
qsort cannot be called with NULL
Merge remote-tracking branch 'upstream/main' into vs2019
Addressed string concatenation issue and added dummy method for Mac/Linux
Added missing variable.
Merge remote-tracking branch 'upstream/main' into xcode
Updated SDL 2.0.16 headers and Mac version of libraries to fix GitHub actions
Addressed PR suggestions
Modified MS Store path handling to better follow the pattern of Steam/GOG
Merge pull request #481 from tomkidd/xcode
Merge pull request #482 from tomkidd/vs2019
OpenGL2: Fix r_grayscale 1 making everything solid black
Print full GL_EXTENSIONS list for OpenGL contexts before 3.0
Fix being unable to enter Team Arena CD key
OpenGL2: GL_DEPTH_TEXTURE_MODE was removed from OpenGL 3.0/Core
Improve setting Microsoft Store path
Update building for macOS in README
Make macOS arm64 default to target macOS 11 in Makefile
Fix error when cross-compiling for macOS arm64 using Makefile
Fix passing arguments to VM dylib on Apple M1
Fix compiling on older macOS
Fix memory corruption in S_TransferPaintBuffer
Fix memset
Fix hex digit
Fix uninitialized variable
some old URL and doc updates
Update README.md
Update FUNDING.yml
code/curl: update ifdef condition for MCST-LCC compiler in mcst-lcc compiler => 1.25 added a new macro definition to determine compiler
Revert "code/curl: update ifdef condition for MCST-LCC compiler"
Revert "E2K: fixed build by MCST lcc compiler when using USE_CURL=1 option"
More predictable mesh normals generation
vm_x86.c: Add `defined(_M_IX86) || defined(_M_X64)` (fix for VS2019)
Add keys for SDL 2.0.14's new gamepad buttons
Fix in_availableJoysticks cvar not updating
Fix (disabled) Wavelet sound decompression
Update to SDL 2.24.0 and add separate macOS UB2 dylib
Update macOS UB1 to SDL 2.0.22
Fix running make-macosx{,-ub2}.sh on Linux
Update MSVC .lib files to SDL 2.24.0
2023-03-02 23:13:18 -06:00

126 lines
3.1 KiB
C

/*
Simple DirectMedia Layer
Copyright (C) 1997-2022 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 the index of the most significant bit, or -1 if the value is 0.
*/
#if defined(__WATCOMC__) && defined(__386__)
extern __inline int _SDL_bsr_watcom(Uint32);
#pragma aux _SDL_bsr_watcom = \
"bsr eax, eax" \
parm [eax] nomemory \
value [eax] \
modify exact [eax] nomemory;
#endif
SDL_FORCE_INLINE int
SDL_MostSignificantBitIndex32(Uint32 x)
{
#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 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);
#elif defined(__WATCOMC__) && defined(__386__)
if (x == 0) {
return -1;
}
return _SDL_bsr_watcom(x);
#elif defined(_MSC_VER)
unsigned long index;
if (_BitScanReverse(&index, x)) {
return index;
}
return -1;
#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
}
SDL_FORCE_INLINE SDL_bool
SDL_HasExactlyOneBitSet32(Uint32 x)
{
if (x && !(x & (x - 1))) {
return SDL_TRUE;
}
return SDL_FALSE;
}
/* 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: */