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Updated SDL2

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This commit is contained in:
Gerhard Stein
2020-09-28 16:41:30 +02:00
parent c6950836a0
commit 2ecfbd1189
1421 changed files with 369825 additions and 151297 deletions
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34
project/jni/sdl-2.0/include/SDL_bits.h
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@@ -1,6 +1,6 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
Copyright (C) 1997-2020 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.
@@ -86,12 +101,21 @@ SDL_MostSignificantBitIndex32(Uint32 x)
#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 */
#endif /* SDL_bits_h_ */
/* vi: set ts=4 sw=4 expandtab: */