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https://github.com/ioquake/ioq3.git
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819e9830d8
Fix crash when scrolling using touchpad on macOS 10.6 (I fixed it in SDL 2.0.18) and fix failing to start on x86 due to ioq3 SDL dylib having absolute path instead of "@executable_path/libSDL2-2.0.0.dylib". SDL 2.24.0 removed macOS 10.6 support (last with x86). Offically at least, they also dropped x86_64 on macOS 10.7 and 10.8. So ioq3 UB1 is limited to SDL 2.0.22. - Update x86 and x86_64 to SDL 2.0.22. Compiled with 10.13 SDK as 10.14 SDK dropped running on older than macOS 10.9 and I ran "strip -x" on the libraries. Ad-hoc signed with PyOxidizer rcodesign. - PPC is still MAN-AT-ARMS' SDL 2.0.1 build but I ran "strip -x" on it to reduce the file size. - ARM64 build was removed from UB1 as UB2 with SDL 2.24.0 should be used instead.
126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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/**
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* \file SDL_bits.h
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*
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* Functions for fiddling with bits and bitmasks.
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*/
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#ifndef SDL_bits_h_
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#define SDL_bits_h_
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#include "SDL_stdinc.h"
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#include "begin_code.h"
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/* Set up for C function definitions, even when using C++ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \file SDL_bits.h
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*/
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/**
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* Get the index of the most significant bit. Result is undefined when called
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* with 0. This operation can also be stated as "count leading zeroes" and
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* "log base 2".
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*
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* \return the index of the most significant bit, or -1 if the value is 0.
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*/
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#if defined(__WATCOMC__) && defined(__386__)
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extern __inline int _SDL_bsr_watcom(Uint32);
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#pragma aux _SDL_bsr_watcom = \
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"bsr eax, eax" \
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parm [eax] nomemory \
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value [eax] \
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modify exact [eax] nomemory;
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#endif
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SDL_FORCE_INLINE int
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SDL_MostSignificantBitIndex32(Uint32 x)
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{
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#if defined(__GNUC__) && (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
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/* Count Leading Zeroes builtin in GCC.
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* http://gcc.gnu.org/onlinedocs/gcc-4.3.4/gcc/Other-Builtins.html
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*/
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if (x == 0) {
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return -1;
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}
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return 31 - __builtin_clz(x);
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#elif defined(__WATCOMC__) && defined(__386__)
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if (x == 0) {
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return -1;
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}
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return _SDL_bsr_watcom(x);
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#elif defined(_MSC_VER)
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unsigned long index;
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if (_BitScanReverse(&index, x)) {
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return index;
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}
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return -1;
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#else
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/* Based off of Bit Twiddling Hacks by Sean Eron Anderson
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* <seander@cs.stanford.edu>, released in the public domain.
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* http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog
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*/
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const Uint32 b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000};
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const int S[] = {1, 2, 4, 8, 16};
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int msbIndex = 0;
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int i;
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if (x == 0) {
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return -1;
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}
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for (i = 4; i >= 0; i--)
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{
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if (x & b[i])
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{
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x >>= S[i];
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msbIndex |= S[i];
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}
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}
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return msbIndex;
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#endif
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}
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SDL_FORCE_INLINE SDL_bool
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SDL_HasExactlyOneBitSet32(Uint32 x)
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{
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if (x && !(x & (x - 1))) {
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return SDL_TRUE;
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}
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return SDL_FALSE;
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}
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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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}
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#endif
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#include "close_code.h"
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#endif /* SDL_bits_h_ */
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/* vi: set ts=4 sw=4 expandtab: */
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