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annotate include/SDL_endian.h @ 4438:7a53f8efc017 SDL-1.2

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esigra 2010-04-17 03:53:57 PDT If this header file is supposed to be includable from C++ code, the code should of course use one of the SDL_*_cast macros from SDL_stdinc.h.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 23 Apr 2010 02:14:06 -0700
parents d660ca4f7b1f
children a5865d4b6495
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * @file SDL_endian.h
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25 * Functions for reading and writing endian-specific values
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26 */
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27
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28 #ifndef _SDL_endian_h
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29 #define _SDL_endian_h
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30
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31 #include "SDL_stdinc.h"
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32
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33 /** @name SDL_ENDIANs
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34 * The two types of endianness
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35 */
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36 /*@{*/
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37 #define SDL_LIL_ENDIAN 1234
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38 #define SDL_BIG_ENDIAN 4321
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39 /*@}*/
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40
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41 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
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42 #if defined(__hppa__) || \
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43 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
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44 (defined(__MIPS__) && defined(__MISPEB__)) || \
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45 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
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46 defined(__sparc__)
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47 #define SDL_BYTEORDER SDL_BIG_ENDIAN
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48 #else
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49 #define SDL_BYTEORDER SDL_LIL_ENDIAN
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50 #endif
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51 #endif /* !SDL_BYTEORDER */
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52
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53
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54 #include "begin_code.h"
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55 /* Set up for C function definitions, even when using C++ */
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56 #ifdef __cplusplus
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57 extern "C" {
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58 #endif
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59
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60 /**
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61 * @name SDL_Swap Functions
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62 * Use inline functions for compilers that support them, and static
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63 * functions for those that do not. Because these functions become
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64 * static for compilers that do not support inline functions, this
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65 * header should only be included in files that actually use them.
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66 */
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67 /*@{*/
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68 #if defined(__GNUC__) && defined(__i386__) && \
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69 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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70 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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71 {
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72 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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73 return x;
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74 }
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75 #elif defined(__GNUC__) && defined(__x86_64__)
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76 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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77 {
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78 __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
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79 return x;
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80 }
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81 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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82 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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83 {
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84 Uint16 result;
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85
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86 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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87 return result;
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88 }
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89 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
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90 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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91 {
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92 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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93 return x;
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94 }
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95 #else
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96 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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97 return SDL_static_cast(Uint16, ((x<<8)|(x>>8)));
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98 }
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99 #endif
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100
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101 #if defined(__GNUC__) && defined(__i386__) && \
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102 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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103 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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104 {
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105 __asm__("bswap %0" : "=r" (x) : "0" (x));
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106 return x;
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107 }
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108 #elif defined(__GNUC__) && defined(__x86_64__)
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109 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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110 {
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111 __asm__("bswapl %0" : "=r" (x) : "0" (x));
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112 return x;
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113 }
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114 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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115 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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116 {
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117 Uint32 result;
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118
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119 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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120 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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121 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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122 return result;
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123 }
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124 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
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125 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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126 {
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127 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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128 return x;
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129 }
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130 #else
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131 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
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132 return SDL_static_cast(Uint32, ((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)));
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133 }
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134 #endif
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135
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136 #ifdef SDL_HAS_64BIT_TYPE
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137 #if defined(__GNUC__) && defined(__i386__) && \
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138 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
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139 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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140 {
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141 union {
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142 struct { Uint32 a,b; } s;
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143 Uint64 u;
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144 } v;
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145 v.u = x;
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146 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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147 : "=r" (v.s.a), "=r" (v.s.b)
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148 : "0" (v.s.a), "1" (v.s.b));
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149 return v.u;
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150 }
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151 #elif defined(__GNUC__) && defined(__x86_64__)
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152 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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153 {
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154 __asm__("bswapq %0" : "=r" (x) : "0" (x));
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155 return x;
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156 }
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157 #else
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158 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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159 {
0
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160 Uint32 hi, lo;
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161
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162 /* Separate into high and low 32-bit values and swap them */
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163 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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164 x >>= 32;
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165 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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166 x = SDL_Swap32(lo);
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167 x <<= 32;
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168 x |= SDL_Swap32(hi);
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169 return (x);
0
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170 }
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171 #endif
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172 #else
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173 /* This is mainly to keep compilers from complaining in SDL code.
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174 * If there is no real 64-bit datatype, then compilers will complain about
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175 * the fake 64-bit datatype that SDL provides when it compiles user code.
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176 */
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177 #define SDL_Swap64(X) (X)
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178 #endif /* SDL_HAS_64BIT_TYPE */
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179 /*@}*/
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180
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181 /**
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182 * @name SDL_SwapLE and SDL_SwapBE Functions
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183 * Byteswap item from the specified endianness to the native endianness
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184 */
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185 /*@{*/
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186 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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187 #define SDL_SwapLE16(X) (X)
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188 #define SDL_SwapLE32(X) (X)
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189 #define SDL_SwapLE64(X) (X)
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190 #define SDL_SwapBE16(X) SDL_Swap16(X)
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191 #define SDL_SwapBE32(X) SDL_Swap32(X)
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192 #define SDL_SwapBE64(X) SDL_Swap64(X)
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193 #else
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194 #define SDL_SwapLE16(X) SDL_Swap16(X)
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195 #define SDL_SwapLE32(X) SDL_Swap32(X)
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196 #define SDL_SwapLE64(X) SDL_Swap64(X)
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197 #define SDL_SwapBE16(X) (X)
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198 #define SDL_SwapBE32(X) (X)
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199 #define SDL_SwapBE64(X) (X)
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200 #endif
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201 /*@}*/
0
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202
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203 /* Ends C function definitions when using C++ */
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204 #ifdef __cplusplus
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205 }
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206 #endif
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207 #include "close_code.h"
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208
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209 #endif /* _SDL_endian_h */