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209 lines
5.7 KiB
209 lines
5.7 KiB
/* |
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SDL - Simple DirectMedia Layer |
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Copyright (C) 1997-2009 Sam Lantinga |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Lesser General Public |
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License as published by the Free Software Foundation; either |
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version 2.1 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Lesser General Public License for more details. |
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You should have received a copy of the GNU Lesser General Public |
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License along with this library; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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Sam Lantinga |
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slouken@libsdl.org |
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*/ |
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/** |
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* @file SDL_endian.h |
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* Functions for reading and writing endian-specific values |
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*/ |
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#ifndef _SDL_endian_h |
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#define _SDL_endian_h |
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#include "SDL_stdinc.h" |
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/** @name SDL_ENDIANs |
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* The two types of endianness |
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*/ |
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/*@{*/ |
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#define SDL_LIL_ENDIAN 1234 |
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#define SDL_BIG_ENDIAN 4321 |
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/*@}*/ |
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#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ |
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#if defined(__hppa__) || \ |
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defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ |
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(defined(__MIPS__) && defined(__MISPEB__)) || \ |
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defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ |
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defined(__sparc__) |
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#define SDL_BYTEORDER SDL_BIG_ENDIAN |
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#else |
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#define SDL_BYTEORDER SDL_LIL_ENDIAN |
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#endif |
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#endif /* !SDL_BYTEORDER */ |
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#include "begin_code.h" |
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/* Set up for C function definitions, even when using C++ */ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** |
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* @name SDL_Swap Functions |
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* Use inline functions for compilers that support them, and static |
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* functions for those that do not. Because these functions become |
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* static for compilers that do not support inline functions, this |
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* header should only be included in files that actually use them. |
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*/ |
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/*@{*/ |
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#if defined(__GNUC__) && defined(__i386__) && \ |
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!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) |
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static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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{ |
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__asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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{ |
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Uint16 result; |
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__asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x)); |
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return result; |
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} |
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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{ |
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__asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc"); |
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return x; |
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} |
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#else |
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static __inline__ Uint16 SDL_Swap16(Uint16 x) { |
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return((x<<8)|(x>>8)); |
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} |
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#endif |
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#if defined(__GNUC__) && defined(__i386__) && \ |
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!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) |
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static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswap %0" : "=r" (x) : "0" (x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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{ |
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__asm__("bswapl %0" : "=r" (x) : "0" (x)); |
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return x; |
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} |
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#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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{ |
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Uint32 result; |
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__asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x)); |
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__asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x)); |
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__asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x)); |
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return result; |
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} |
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#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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{ |
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__asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc"); |
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return x; |
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} |
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#else |
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static __inline__ Uint32 SDL_Swap32(Uint32 x) { |
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return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)); |
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} |
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#endif |
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#ifdef SDL_HAS_64BIT_TYPE |
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#if defined(__GNUC__) && defined(__i386__) && \ |
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!(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */) |
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static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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{ |
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union { |
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struct { Uint32 a,b; } s; |
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Uint64 u; |
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} v; |
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v.u = x; |
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__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
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: "=r" (v.s.a), "=r" (v.s.b) |
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: "0" (v.s.a), "1" (v.s.b)); |
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return v.u; |
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} |
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#elif defined(__GNUC__) && defined(__x86_64__) |
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static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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{ |
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__asm__("bswapq %0" : "=r" (x) : "0" (x)); |
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return x; |
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} |
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#else |
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static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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{ |
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Uint32 hi, lo; |
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/* Separate into high and low 32-bit values and swap them */ |
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lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); |
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x >>= 32; |
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hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); |
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x = SDL_Swap32(lo); |
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x <<= 32; |
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x |= SDL_Swap32(hi); |
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return(x); |
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} |
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#endif |
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#else |
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/* This is mainly to keep compilers from complaining in SDL code. |
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* If there is no real 64-bit datatype, then compilers will complain about |
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* the fake 64-bit datatype that SDL provides when it compiles user code. |
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*/ |
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#define SDL_Swap64(X) (X) |
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#endif /* SDL_HAS_64BIT_TYPE */ |
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/*@}*/ |
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/** |
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* @name SDL_SwapLE and SDL_SwapBE Functions |
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* Byteswap item from the specified endianness to the native endianness |
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*/ |
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/*@{*/ |
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#if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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#define SDL_SwapLE16(X) (X) |
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#define SDL_SwapLE32(X) (X) |
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#define SDL_SwapLE64(X) (X) |
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#define SDL_SwapBE16(X) SDL_Swap16(X) |
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#define SDL_SwapBE32(X) SDL_Swap32(X) |
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#define SDL_SwapBE64(X) SDL_Swap64(X) |
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#else |
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#define SDL_SwapLE16(X) SDL_Swap16(X) |
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#define SDL_SwapLE32(X) SDL_Swap32(X) |
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#define SDL_SwapLE64(X) SDL_Swap64(X) |
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#define SDL_SwapBE16(X) (X) |
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#define SDL_SwapBE32(X) (X) |
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#define SDL_SwapBE64(X) (X) |
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#endif |
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/*@}*/ |
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/* Ends C function definitions when using C++ */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#include "close_code.h" |
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#endif /* _SDL_endian_h */
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