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Update SDL2 to 2.0.8

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MAN-AT-ARMS 2018-04-14 18:49:28 -04:00 • committed by Zack Middleton
parent 8bd2c79109
commit 5bf60a9504
89 changed files with 2756 additions and 801 deletions
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25
code/SDL2/include/SDL_bits.h
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@ -1,6 +1,6 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
Copyright (C) 1997-2018 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
@ -25,8 +25,8 @@
* Functions for fiddling with bits and bitmasks.
*/
#ifndef _SDL_bits_h
#define _SDL_bits_h
#ifndef SDL_bits_h_
#define SDL_bits_h_
#include "SDL_stdinc.h"
@ -47,10 +47,20 @@ extern "C" {
*
* \return Index of the most significant bit, or -1 if the value is 0.
*/
#if defined(__WATCOMC__) && defined(__386__)
extern _inline int _SDL_clz_watcom (Uint32);
#pragma aux _SDL_clz_watcom = \
"bsr eax, eax" \
"xor eax, 31" \
parm [eax] nomemory \
value [eax] \
modify exact [eax] nomemory;
#endif
SDL_FORCE_INLINE int
SDL_MostSignificantBitIndex32(Uint32 x)
{
#if defined(__GNUC__) && __GNUC__ >= 4
#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
*/
@ -58,6 +68,11 @@ SDL_MostSignificantBitIndex32(Uint32 x)
return -1;
}
return 31 - __builtin_clz(x);
#elif defined(__WATCOMC__) && defined(__386__)
if (x == 0) {
return -1;
}
return 31 - _SDL_clz_watcom(x);
#else
/* Based off of Bit Twiddling Hacks by Sean Eron Anderson
* <seander@cs.stanford.edu>, released in the public domain.
@ -92,6 +107,6 @@ SDL_MostSignificantBitIndex32(Uint32 x)
#endif
#include "close_code.h"
#endif /* _SDL_bits_h */
#endif /* SDL_bits_h_ */
/* vi: set ts=4 sw=4 expandtab: */