source: trunk/external/sdl-1.2.15/include/SDL_endian.h @ 2214

Last change on this file since 2214 was 1586, checked in by sam, 9 years ago

build: update Windows SDL binaries to 1.2.15.

File size: 5.9 KB
Line 
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
62extern "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 */)
75static __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__)
81static __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__))
87static __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__))
95static __inline__ Uint16 SDL_Swap16(Uint16 x)
96{
97        __asm__("rorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
98        return x;
99}
100#else
101static __inline__ Uint16 SDL_Swap16(Uint16 x) {
102        return SDL_static_cast(Uint16, ((x<<8)|(x>>8)));
103}
104#endif
105
106#if defined(__GNUC__) && defined(__i386__) && \
107   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
108static __inline__ Uint32 SDL_Swap32(Uint32 x)
109{
110        __asm__("bswap %0" : "=r" (x) : "0" (x));
111        return x;
112}
113#elif defined(__GNUC__) && defined(__x86_64__)
114static __inline__ Uint32 SDL_Swap32(Uint32 x)
115{
116        __asm__("bswapl %0" : "=r" (x) : "0" (x));
117        return x;
118}
119#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
120static __inline__ Uint32 SDL_Swap32(Uint32 x)
121{
122        Uint32 result;
123
124        __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
125        __asm__("rlwimi %0,%2,8,8,15"   : "=&r" (result) : "0" (result),    "r" (x));
126        __asm__("rlwimi %0,%2,24,0,7"   : "=&r" (result) : "0" (result),    "r" (x));
127        return result;
128}
129#elif defined(__GNUC__) && (defined(__m68k__) && !defined(__mcoldfire__))
130static __inline__ Uint32 SDL_Swap32(Uint32 x)
131{
132        __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) :  "0" (x) : "cc");
133        return x;
134}
135#else
136static __inline__ Uint32 SDL_Swap32(Uint32 x) {
137        return SDL_static_cast(Uint32, ((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)));
138}
139#endif
140
141#ifdef SDL_HAS_64BIT_TYPE
142#if defined(__GNUC__) && defined(__i386__) && \
143   !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
144static __inline__ Uint64 SDL_Swap64(Uint64 x)
145{
146        union {
147                struct { Uint32 a,b; } s;
148                Uint64 u;
149        } v;
150        v.u = x;
151        __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
152                : "=r" (v.s.a), "=r" (v.s.b)
153                : "0" (v.s.a), "1" (v.s.b));
154        return v.u;
155}
156#elif defined(__GNUC__) && defined(__x86_64__)
157static __inline__ Uint64 SDL_Swap64(Uint64 x)
158{
159        __asm__("bswapq %0" : "=r" (x) : "0" (x));
160        return x;
161}
162#else
163static __inline__ Uint64 SDL_Swap64(Uint64 x)
164{
165        Uint32 hi, lo;
166
167        /* Separate into high and low 32-bit values and swap them */
168        lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
169        x >>= 32;
170        hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
171        x = SDL_Swap32(lo);
172        x <<= 32;
173        x |= SDL_Swap32(hi);
174        return (x);
175}
176#endif
177#else
178/* This is mainly to keep compilers from complaining in SDL code.
179 * If there is no real 64-bit datatype, then compilers will complain about
180 * the fake 64-bit datatype that SDL provides when it compiles user code.
181 */
182#define SDL_Swap64(X)   (X)
183#endif /* SDL_HAS_64BIT_TYPE */
184/*@}*/
185
186/**
187 *  @name SDL_SwapLE and SDL_SwapBE Functions
188 *  Byteswap item from the specified endianness to the native endianness
189 */
190/*@{*/
191#if SDL_BYTEORDER == SDL_LIL_ENDIAN
192#define SDL_SwapLE16(X) (X)
193#define SDL_SwapLE32(X) (X)
194#define SDL_SwapLE64(X) (X)
195#define SDL_SwapBE16(X) SDL_Swap16(X)
196#define SDL_SwapBE32(X) SDL_Swap32(X)
197#define SDL_SwapBE64(X) SDL_Swap64(X)
198#else
199#define SDL_SwapLE16(X) SDL_Swap16(X)
200#define SDL_SwapLE32(X) SDL_Swap32(X)
201#define SDL_SwapLE64(X) SDL_Swap64(X)
202#define SDL_SwapBE16(X) (X)
203#define SDL_SwapBE32(X) (X)
204#define SDL_SwapBE64(X) (X)
205#endif
206/*@}*/
207
208/* Ends C function definitions when using C++ */
209#ifdef __cplusplus
210}
211#endif
212#include "close_code.h"
213
214#endif /* _SDL_endian_h */
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