include/SDL_endian.h
author Jørgen P. Tjernø <jorgen@valvesoftware.com>
Wed, 05 Jun 2013 12:48:44 -0700
changeset 7277 1290cd7f34af
parent 7191 75360622e65f
child 7677 871d43c6968a
permissions -rw-r--r--
Mac: Fix invalid PS3 controller mapping.

PS3 controller had swapped D-Pad down & left buttons, as well as X & Y buttons.
Thanks to Alex Szpakowski for the bug report and fix.

Fixes http://bugzilla.libsdl.org/show_bug.cgi?id=1891
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2013 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 #else
   100 SDL_FORCE_INLINE Uint16
   101 SDL_Swap16(Uint16 x)
   102 {
   103     return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
   104 }
   105 #endif
   106 
   107 #if defined(__GNUC__) && defined(__i386__)
   108 SDL_FORCE_INLINE Uint32
   109 SDL_Swap32(Uint32 x)
   110 {
   111   __asm__("bswap %0": "=r"(x):"0"(x));
   112     return x;
   113 }
   114 #elif defined(__GNUC__) && defined(__x86_64__)
   115 SDL_FORCE_INLINE Uint32
   116 SDL_Swap32(Uint32 x)
   117 {
   118   __asm__("bswapl %0": "=r"(x):"0"(x));
   119     return x;
   120 }
   121 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
   122 SDL_FORCE_INLINE Uint32
   123 SDL_Swap32(Uint32 x)
   124 {
   125     Uint32 result;
   126 
   127   __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
   128   __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
   129   __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
   130     return result;
   131 }
   132 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
   133 SDL_FORCE_INLINE Uint32
   134 SDL_Swap32(Uint32 x)
   135 {
   136   __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
   137     return x;
   138 }
   139 #else
   140 SDL_FORCE_INLINE Uint32
   141 SDL_Swap32(Uint32 x)
   142 {
   143     return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
   144                                     ((x >> 8) & 0x0000FF00) | (x >> 24)));
   145 }
   146 #endif
   147 
   148 #if defined(__GNUC__) && defined(__i386__)
   149 SDL_FORCE_INLINE Uint64
   150 SDL_Swap64(Uint64 x)
   151 {
   152     union
   153     {
   154         struct
   155         {
   156             Uint32 a, b;
   157         } s;
   158         Uint64 u;
   159     } v;
   160     v.u = x;
   161   __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
   162             "1"(v.s.
   163                 b));
   164     return v.u;
   165 }
   166 #elif defined(__GNUC__) && defined(__x86_64__)
   167 SDL_FORCE_INLINE Uint64
   168 SDL_Swap64(Uint64 x)
   169 {
   170   __asm__("bswapq %0": "=r"(x):"0"(x));
   171     return x;
   172 }
   173 #else
   174 SDL_FORCE_INLINE Uint64
   175 SDL_Swap64(Uint64 x)
   176 {
   177     Uint32 hi, lo;
   178 
   179     /* Separate into high and low 32-bit values and swap them */
   180     lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   181     x >>= 32;
   182     hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   183     x = SDL_Swap32(lo);
   184     x <<= 32;
   185     x |= SDL_Swap32(hi);
   186     return (x);
   187 }
   188 #endif
   189 
   190 
   191 SDL_FORCE_INLINE float
   192 SDL_SwapFloat(float x)
   193 {
   194     union
   195     {
   196         float f;
   197         Uint32 ui32;
   198     } swapper;
   199     swapper.f = x;
   200     swapper.ui32 = SDL_Swap32(swapper.ui32);
   201     return swapper.f;
   202 }
   203 
   204 
   205 /**
   206  *  \name Swap to native
   207  *  Byteswap item from the specified endianness to the native endianness.
   208  */
   209 /*@{*/
   210 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   211 #define SDL_SwapLE16(X) (X)
   212 #define SDL_SwapLE32(X) (X)
   213 #define SDL_SwapLE64(X) (X)
   214 #define SDL_SwapFloatLE(X)  (X)
   215 #define SDL_SwapBE16(X) SDL_Swap16(X)
   216 #define SDL_SwapBE32(X) SDL_Swap32(X)
   217 #define SDL_SwapBE64(X) SDL_Swap64(X)
   218 #define SDL_SwapFloatBE(X)  SDL_SwapFloat(X)
   219 #else
   220 #define SDL_SwapLE16(X) SDL_Swap16(X)
   221 #define SDL_SwapLE32(X) SDL_Swap32(X)
   222 #define SDL_SwapLE64(X) SDL_Swap64(X)
   223 #define SDL_SwapFloatLE(X)  SDL_SwapFloat(X)
   224 #define SDL_SwapBE16(X) (X)
   225 #define SDL_SwapBE32(X) (X)
   226 #define SDL_SwapBE64(X) (X)
   227 #define SDL_SwapFloatBE(X)  (X)
   228 #endif
   229 /*@}*//*Swap to native*/
   230 
   231 /* Ends C function definitions when using C++ */
   232 #ifdef __cplusplus
   233 }
   234 #endif
   235 #include "close_code.h"
   236 
   237 #endif /* _SDL_endian_h */
   238 
   239 /* vi: set ts=4 sw=4 expandtab: */