include/SDL_endian.h
author Sam Lantinga <slouken@libsdl.org>
Sun, 28 May 2006 13:04:16 +0000
branchSDL-1.3
changeset 1662 782fd950bd46
parent 1475 d45aefcac017
child 1668 4da1ee79c9af
permissions -rw-r--r--
Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 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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 *
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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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/* The two types of endianness */
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#define SDL_LIL_ENDIAN	1234
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#define SDL_BIG_ENDIAN	4321
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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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/* *INDENT-OFF* */
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extern "C" {
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/* *INDENT-ON* */
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#endif
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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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#if defined(__GNUC__) && defined(__i386__) && \
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   !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
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static __inline__ Uint16
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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
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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
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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
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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
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SDL_Swap16 (Uint16 x)
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{
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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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static __inline__ Uint32
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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
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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
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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),
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             "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
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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
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SDL_Swap32 (Uint32 x)
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{
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    return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) |
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            (x >> 24));
0
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}
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#endif
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0
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#ifdef SDL_HAS_64BIT_TYPE
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#if defined(__GNUC__) && defined(__i386__)
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static __inline__ Uint64
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SDL_Swap64 (Uint64 x)
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{
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    union
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    {
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        struct
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        {
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            Uint32 a, b;
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        } 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": "=r" (v.s.a), "=r" (v.s.b):"0" (v.s.a),
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             "1" (v.s.
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                  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
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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
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SDL_Swap64 (Uint64 x)
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{
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    Uint32 hi, lo;
0
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    /* Separate into high and low 32-bit values and swap them */
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    lo = (Uint32) (x & 0xFFFFFFFF);
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    x >>= 32;
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    hi = (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);
0
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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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/* Byteswap item from the specified endianness to the native endianness */
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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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/* Ends C function definitions when using C++ */
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#ifdef __cplusplus
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/* *INDENT-OFF* */
0
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}
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/* *INDENT-ON* */
0
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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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/* vi: set ts=4 sw=4 expandtab: */