include/SDL_endian.h
author Ozkan Sezer <sezeroz@gmail.com>
Thu, 16 Aug 2018 11:01:02 +0300
changeset 12120 0131b11bd03f
parent 11811 5d94cb6b24d3
permissions -rw-r--r--
SDL_hidapi_ps4.c: define NTDDI_VISTA / _WIN32_WINNT_VISTA if not defined

it still needs a Vista or newer Platform SDK to build, though.
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 
    22 /**
    23  *  \file SDL_endian.h
    24  *
    25  *  Functions for reading and writing endian-specific values
    26  */
    27 
    28 #ifndef SDL_endian_h_
    29 #define SDL_endian_h_
    30 
    31 #include "SDL_stdinc.h"
    32 
    33 /**
    34  *  \name The two types of endianness
    35  */
    36 /* @{ */
    37 #define SDL_LIL_ENDIAN  1234
    38 #define SDL_BIG_ENDIAN  4321
    39 /* @} */
    40 
    41 #ifndef SDL_BYTEORDER           /* Not defined in SDL_config.h? */
    42 #ifdef __linux__
    43 #include <endian.h>
    44 #define SDL_BYTEORDER  __BYTE_ORDER
    45 #else /* __linux__ */
    46 #if defined(__hppa__) || \
    47     defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
    48     (defined(__MIPS__) && defined(__MISPEB__)) || \
    49     defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
    50     defined(__sparc__)
    51 #define SDL_BYTEORDER   SDL_BIG_ENDIAN
    52 #else
    53 #define SDL_BYTEORDER   SDL_LIL_ENDIAN
    54 #endif
    55 #endif /* __linux__ */
    56 #endif /* !SDL_BYTEORDER */
    57 
    58 
    59 #include "begin_code.h"
    60 /* Set up for C function definitions, even when using C++ */
    61 #ifdef __cplusplus
    62 extern "C" {
    63 #endif
    64 
    65 /**
    66  *  \file SDL_endian.h
    67  */
    68 #if defined(__GNUC__) && defined(__i386__) && \
    69    !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
    70 SDL_FORCE_INLINE Uint16
    71 SDL_Swap16(Uint16 x)
    72 {
    73   __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
    74     return x;
    75 }
    76 #elif defined(__GNUC__) && defined(__x86_64__)
    77 SDL_FORCE_INLINE Uint16
    78 SDL_Swap16(Uint16 x)
    79 {
    80   __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
    81     return x;
    82 }
    83 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
    84 SDL_FORCE_INLINE Uint16
    85 SDL_Swap16(Uint16 x)
    86 {
    87     int result;
    88 
    89   __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
    90     return (Uint16)result;
    91 }
    92 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
    93 SDL_FORCE_INLINE Uint16
    94 SDL_Swap16(Uint16 x)
    95 {
    96   __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
    97     return x;
    98 }
    99 #elif defined(__WATCOMC__) && defined(__386__)
   100 extern _inline Uint16 SDL_Swap16(Uint16);
   101 #pragma aux SDL_Swap16 = \
   102   "xchg al, ah" \
   103   parm   [ax]   \
   104   modify [ax];
   105 #else
   106 SDL_FORCE_INLINE Uint16
   107 SDL_Swap16(Uint16 x)
   108 {
   109     return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
   110 }
   111 #endif
   112 
   113 #if defined(__GNUC__) && defined(__i386__)
   114 SDL_FORCE_INLINE Uint32
   115 SDL_Swap32(Uint32 x)
   116 {
   117   __asm__("bswap %0": "=r"(x):"0"(x));
   118     return x;
   119 }
   120 #elif defined(__GNUC__) && defined(__x86_64__)
   121 SDL_FORCE_INLINE Uint32
   122 SDL_Swap32(Uint32 x)
   123 {
   124   __asm__("bswapl %0": "=r"(x):"0"(x));
   125     return x;
   126 }
   127 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
   128 SDL_FORCE_INLINE Uint32
   129 SDL_Swap32(Uint32 x)
   130 {
   131     Uint32 result;
   132 
   133   __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
   134   __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
   135   __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
   136     return result;
   137 }
   138 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
   139 SDL_FORCE_INLINE Uint32
   140 SDL_Swap32(Uint32 x)
   141 {
   142   __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
   143     return x;
   144 }
   145 #elif defined(__WATCOMC__) && defined(__386__)
   146 extern _inline Uint32 SDL_Swap32(Uint32);
   147 #ifndef __SW_3 /* 486+ */
   148 #pragma aux SDL_Swap32 = \
   149   "bswap eax"  \
   150   parm   [eax] \
   151   modify [eax];
   152 #else  /* 386-only */
   153 #pragma aux SDL_Swap32 = \
   154   "xchg al, ah"  \
   155   "ror  eax, 16" \
   156   "xchg al, ah"  \
   157   parm   [eax]   \
   158   modify [eax];
   159 #endif
   160 #else
   161 SDL_FORCE_INLINE Uint32
   162 SDL_Swap32(Uint32 x)
   163 {
   164     return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
   165                                     ((x >> 8) & 0x0000FF00) | (x >> 24)));
   166 }
   167 #endif
   168 
   169 #if defined(__GNUC__) && defined(__i386__)
   170 SDL_FORCE_INLINE Uint64
   171 SDL_Swap64(Uint64 x)
   172 {
   173     union
   174     {
   175         struct
   176         {
   177             Uint32 a, b;
   178         } s;
   179         Uint64 u;
   180     } v;
   181     v.u = x;
   182   __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
   183             "1"(v.s.
   184                 b));
   185     return v.u;
   186 }
   187 #elif defined(__GNUC__) && defined(__x86_64__)
   188 SDL_FORCE_INLINE Uint64
   189 SDL_Swap64(Uint64 x)
   190 {
   191   __asm__("bswapq %0": "=r"(x):"0"(x));
   192     return x;
   193 }
   194 #else
   195 SDL_FORCE_INLINE Uint64
   196 SDL_Swap64(Uint64 x)
   197 {
   198     Uint32 hi, lo;
   199 
   200     /* Separate into high and low 32-bit values and swap them */
   201     lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   202     x >>= 32;
   203     hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   204     x = SDL_Swap32(lo);
   205     x <<= 32;
   206     x |= SDL_Swap32(hi);
   207     return (x);
   208 }
   209 #endif
   210 
   211 
   212 SDL_FORCE_INLINE float
   213 SDL_SwapFloat(float x)
   214 {
   215     union
   216     {
   217         float f;
   218         Uint32 ui32;
   219     } swapper;
   220     swapper.f = x;
   221     swapper.ui32 = SDL_Swap32(swapper.ui32);
   222     return swapper.f;
   223 }
   224 
   225 
   226 /**
   227  *  \name Swap to native
   228  *  Byteswap item from the specified endianness to the native endianness.
   229  */
   230 /* @{ */
   231 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   232 #define SDL_SwapLE16(X) (X)
   233 #define SDL_SwapLE32(X) (X)
   234 #define SDL_SwapLE64(X) (X)
   235 #define SDL_SwapFloatLE(X)  (X)
   236 #define SDL_SwapBE16(X) SDL_Swap16(X)
   237 #define SDL_SwapBE32(X) SDL_Swap32(X)
   238 #define SDL_SwapBE64(X) SDL_Swap64(X)
   239 #define SDL_SwapFloatBE(X)  SDL_SwapFloat(X)
   240 #else
   241 #define SDL_SwapLE16(X) SDL_Swap16(X)
   242 #define SDL_SwapLE32(X) SDL_Swap32(X)
   243 #define SDL_SwapLE64(X) SDL_Swap64(X)
   244 #define SDL_SwapFloatLE(X)  SDL_SwapFloat(X)
   245 #define SDL_SwapBE16(X) (X)
   246 #define SDL_SwapBE32(X) (X)
   247 #define SDL_SwapBE64(X) (X)
   248 #define SDL_SwapFloatBE(X)  (X)
   249 #endif
   250 /* @} *//* Swap to native */
   251 
   252 /* Ends C function definitions when using C++ */
   253 #ifdef __cplusplus
   254 }
   255 #endif
   256 #include "close_code.h"
   257 
   258 #endif /* SDL_endian_h_ */
   259 
   260 /* vi: set ts=4 sw=4 expandtab: */