include/SDL_endian.h
author Ozkan Sezer <sezeroz@gmail.com>
Sun, 01 Jul 2018 17:00:02 +0300
branchSDL-1.2
changeset 12053 edddd89f910d
parent 11965 afbe1aac2dd1
permissions -rw-r--r--
SDL_svgaevents.c: add missing ioctl.h include
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2012 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Lesser General Public
     7     License as published by the Free Software Foundation; either
     8     version 2.1 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Lesser General Public License for more details.
    14 
    15     You should have received a copy of the GNU Lesser General Public
    16     License along with this library; if not, write to the Free Software
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 /**
    24  *  @file SDL_endian.h
    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 /** @name SDL_ENDIANs
    34  *  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  *  @name SDL_Swap Functions
    67  *  Use inline functions for compilers that support them, and static
    68  *  functions for those that do not.  Because these functions become
    69  *  static for compilers that do not support inline functions, this
    70  *  header should only be included in files that actually use them.
    71  */
    72 /*@{*/
    73 #if defined(__GNUC__) && defined(__i386__) && \
    74    !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
    75 static __inline__ Uint16 SDL_Swap16(Uint16 x)
    76 {
    77 	__asm__("xchgb %b0,%h0" : "=q" (x) :  "0" (x));
    78 	return x;
    79 }
    80 #elif defined(__GNUC__) && defined(__x86_64__)
    81 static __inline__ Uint16 SDL_Swap16(Uint16 x)
    82 {
    83 	__asm__("xchgb %b0,%h0" : "=Q" (x) :  "0" (x));
    84 	return x;
    85 }
    86 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
    87 static __inline__ Uint16 SDL_Swap16(Uint16 x)
    88 {
    89 	int result;
    90 
    91 	__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
    92 	return (Uint16)result;
    93 }
    94 #elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
    95 static __inline__ Uint16 SDL_Swap16(Uint16 x)
    96 {
    97 	__asm__("rorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
    98 	return x;
    99 }
   100 #elif defined(__WATCOMC__) && defined(__386__)
   101 extern _inline Uint16 SDL_Swap16(Uint16);
   102 #pragma aux SDL_Swap16 = \
   103 	"xchg al, ah" \
   104 	parm   [ax]   \
   105 	modify [ax];
   106 #else
   107 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
   108 	return SDL_static_cast(Uint16, ((x<<8)|(x>>8)));
   109 }
   110 #endif
   111 
   112 #if defined(__GNUC__) && defined(__i386__) && \
   113    !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
   114 static __inline__ Uint32 SDL_Swap32(Uint32 x)
   115 {
   116 	__asm__("bswap %0" : "=r" (x) : "0" (x));
   117 	return x;
   118 }
   119 #elif defined(__GNUC__) && defined(__x86_64__)
   120 static __inline__ Uint32 SDL_Swap32(Uint32 x)
   121 {
   122 	__asm__("bswapl %0" : "=r" (x) : "0" (x));
   123 	return x;
   124 }
   125 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
   126 static __inline__ Uint32 SDL_Swap32(Uint32 x)
   127 {
   128 	Uint32 result;
   129 
   130 	__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
   131 	__asm__("rlwimi %0,%2,8,8,15"   : "=&r" (result) : "0" (result),    "r" (x));
   132 	__asm__("rlwimi %0,%2,24,0,7"   : "=&r" (result) : "0" (result),    "r" (x));
   133 	return result;
   134 }
   135 #elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
   136 static __inline__ Uint32 SDL_Swap32(Uint32 x)
   137 {
   138 	__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
   139 	return x;
   140 }
   141 #elif defined(__WATCOMC__) && defined(__386__)
   142 extern _inline Uint32 SDL_Swap32(Uint32);
   143 #ifndef __SW_3 /* 486+ */
   144 #pragma aux SDL_Swap32 = \
   145 	"bswap eax"  \
   146 	parm   [eax] \
   147 	modify [eax];
   148 #else  /* 386-only */
   149 #pragma aux SDL_Swap32 = \
   150 	"xchg al, ah"  \
   151 	"ror  eax, 16" \
   152 	"xchg al, ah"  \
   153 	parm   [eax]   \
   154 	modify [eax];
   155 #endif
   156 #else
   157 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
   158 	return SDL_static_cast(Uint32, ((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)));
   159 }
   160 #endif
   161 
   162 #ifdef SDL_HAS_64BIT_TYPE
   163 #if defined(__GNUC__) && defined(__i386__) && \
   164    !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
   165 static __inline__ Uint64 SDL_Swap64(Uint64 x)
   166 {
   167 	union { 
   168 		struct { Uint32 a,b; } s;
   169 		Uint64 u;
   170 	} v;
   171 	v.u = x;
   172 	__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 
   173 	        : "=r" (v.s.a), "=r" (v.s.b) 
   174 	        : "0" (v.s.a), "1" (v.s.b)); 
   175 	return v.u;
   176 }
   177 #elif defined(__GNUC__) && defined(__x86_64__)
   178 static __inline__ Uint64 SDL_Swap64(Uint64 x)
   179 {
   180 	__asm__("bswapq %0" : "=r" (x) : "0" (x));
   181 	return x;
   182 }
   183 #else
   184 static __inline__ Uint64 SDL_Swap64(Uint64 x)
   185 {
   186 	Uint32 hi, lo;
   187 
   188 	/* Separate into high and low 32-bit values and swap them */
   189 	lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   190 	x >>= 32;
   191 	hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
   192 	x = SDL_Swap32(lo);
   193 	x <<= 32;
   194 	x |= SDL_Swap32(hi);
   195 	return (x);
   196 }
   197 #endif
   198 #else
   199 /* This is mainly to keep compilers from complaining in SDL code.
   200  * If there is no real 64-bit datatype, then compilers will complain about
   201  * the fake 64-bit datatype that SDL provides when it compiles user code.
   202  */
   203 #define SDL_Swap64(X)	(X)
   204 #endif /* SDL_HAS_64BIT_TYPE */
   205 /*@}*/
   206 
   207 /**
   208  *  @name SDL_SwapLE and SDL_SwapBE Functions
   209  *  Byteswap item from the specified endianness to the native endianness
   210  */
   211 /*@{*/
   212 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
   213 #define SDL_SwapLE16(X)	(X)
   214 #define SDL_SwapLE32(X)	(X)
   215 #define SDL_SwapLE64(X)	(X)
   216 #define SDL_SwapBE16(X)	SDL_Swap16(X)
   217 #define SDL_SwapBE32(X)	SDL_Swap32(X)
   218 #define SDL_SwapBE64(X)	SDL_Swap64(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_SwapBE16(X)	(X)
   224 #define SDL_SwapBE32(X)	(X)
   225 #define SDL_SwapBE64(X)	(X)
   226 #endif
   227 /*@}*/
   228 
   229 /* Ends C function definitions when using C++ */
   230 #ifdef __cplusplus
   231 }
   232 #endif
   233 #include "close_code.h"
   234 
   235 #endif /* _SDL_endian_h */