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annotate include/SDL_endian.h @ 3550:6b69c5def097

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Minor documentation fix
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Dec 2009 20:30:25 +0000
parents d3baf5ac4e37
children efb79807afe1
rev   line source
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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 *
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26 * Functions for reading and writing endian-specific values
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27 */
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28
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29 #ifndef _SDL_endian_h
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30 #define _SDL_endian_h
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31
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32 #include "SDL_stdinc.h"
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33
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34 /**
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35 * \name The two types of endianness
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36 */
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37 /*@{*/
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38 #define SDL_LIL_ENDIAN 1234
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39 #define SDL_BIG_ENDIAN 4321
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40 /*@}*/
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41
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42 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
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43 #if defined(__hppa__) || \
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44 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
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45 (defined(__MIPS__) && defined(__MISPEB__)) || \
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46 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
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47 defined(__sparc__)
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48 #define SDL_BYTEORDER SDL_BIG_ENDIAN
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49 #else
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50 #define SDL_BYTEORDER SDL_LIL_ENDIAN
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51 #endif
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52 #endif /* !SDL_BYTEORDER */
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53
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54
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55 #include "begin_code.h"
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56 /* Set up for C function definitions, even when using C++ */
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57 #ifdef __cplusplus
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58 /* *INDENT-OFF* */
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59 extern "C" {
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60 /* *INDENT-ON* */
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61 #endif
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62
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63 /**
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64 * \file SDL_endian.h
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65 *
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66 * Uses inline functions for compilers that support them, and static
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67 * functions for those that do not. Because these functions become
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68 * static for compilers that do not support inline functions, this
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69 * header should only be included in files that actually use them.
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70 */
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71 #if defined(__GNUC__) && defined(__i386__) && \
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72 !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
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73 static __inline__ Uint16
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74 SDL_Swap16(Uint16 x)
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75 {
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76 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
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77 return x;
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78 }
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79 #elif defined(__GNUC__) && defined(__x86_64__)
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80 static __inline__ Uint16
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81 SDL_Swap16(Uint16 x)
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82 {
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83 __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
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84 return x;
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85 }
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86 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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87 static __inline__ Uint16
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88 SDL_Swap16(Uint16 x)
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89 {
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90 Uint16 result;
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91
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92 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
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93 return result;
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94 }
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95 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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96 static __inline__ Uint16
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97 SDL_Swap16(Uint16 x)
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98 {
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99 __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
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100 return x;
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101 }
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102 #else
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103 static __inline__ Uint16
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104 SDL_Swap16(Uint16 x)
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105 {
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106 return ((x << 8) | (x >> 8));
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107 }
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108 #endif
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109
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110 #if defined(__GNUC__) && defined(__i386__)
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111 static __inline__ Uint32
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112 SDL_Swap32(Uint32 x)
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113 {
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114 __asm__("bswap %0": "=r"(x):"0"(x));
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115 return x;
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116 }
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117 #elif defined(__GNUC__) && defined(__x86_64__)
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118 static __inline__ Uint32
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119 SDL_Swap32(Uint32 x)
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120 {
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121 __asm__("bswapl %0": "=r"(x):"0"(x));
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122 return x;
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123 }
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124 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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125 static __inline__ Uint32
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126 SDL_Swap32(Uint32 x)
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127 {
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128 Uint32 result;
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129
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130 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
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131 __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
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132 __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
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133 return result;
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134 }
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135 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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136 static __inline__ Uint32
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137 SDL_Swap32(Uint32 x)
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138 {
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139 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
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140 return x;
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141 }
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142 #else
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143 static __inline__ Uint32
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144 SDL_Swap32(Uint32 x)
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145 {
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146 return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) |
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147 (x >> 24));
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148 }
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149 #endif
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150
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151 #ifdef SDL_HAS_64BIT_TYPE
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152 #if defined(__GNUC__) && defined(__i386__)
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153 static __inline__ Uint64
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154 SDL_Swap64(Uint64 x)
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155 {
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156 union
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157 {
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158 struct
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159 {
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160 Uint32 a, b;
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161 } s;
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162 Uint64 u;
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163 } v;
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164 v.u = x;
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165 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
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166 "1"(v.s.
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167 b));
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168 return v.u;
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169 }
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170 #elif defined(__GNUC__) && defined(__x86_64__)
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171 static __inline__ Uint64
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172 SDL_Swap64(Uint64 x)
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173 {
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174 __asm__("bswapq %0": "=r"(x):"0"(x));
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175 return x;
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176 }
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177 #else
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178 static __inline__ Uint64
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179 SDL_Swap64(Uint64 x)
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180 {
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181 Uint32 hi, lo;
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182
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183 /* Separate into high and low 32-bit values and swap them */
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184 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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185 x >>= 32;
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186 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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187 x = SDL_Swap32(lo);
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188 x <<= 32;
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189 x |= SDL_Swap32(hi);
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190 return (x);
0
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191 }
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192 #endif
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193 #else
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194 /**
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195 * This is mainly to keep compilers from complaining in SDL code.
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196 * If there is no real 64-bit datatype, then compilers will complain about
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197 * the fake 64-bit datatype that SDL provides when it compiles user code.
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198 */
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199 #define SDL_Swap64(X) (X)
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200 #endif /* SDL_HAS_64BIT_TYPE */
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201
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202
1984
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203 static __inline__ float
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204 SDL_SwapFloat(float x)
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205 {
1985
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206 union
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207 {
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208 float f;
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209 Uint32 ui32;
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210 } swapper;
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211 swapper.f = x;
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212 swapper.ui32 = SDL_Swap32(swapper.ui32);
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213 return swapper.f;
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214 }
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215
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216
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217 /**
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218 * \name Swap to native
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219 * Byteswap item from the specified endianness to the native endianness.
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220 */
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221 /*@{*/
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222 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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223 #define SDL_SwapLE16(X) (X)
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224 #define SDL_SwapLE32(X) (X)
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225 #define SDL_SwapLE64(X) (X)
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226 #define SDL_SwapFloatLE(X) (X)
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227 #define SDL_SwapBE16(X) SDL_Swap16(X)
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228 #define SDL_SwapBE32(X) SDL_Swap32(X)
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229 #define SDL_SwapBE64(X) SDL_Swap64(X)
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230 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
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231 #else
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232 #define SDL_SwapLE16(X) SDL_Swap16(X)
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233 #define SDL_SwapLE32(X) SDL_Swap32(X)
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234 #define SDL_SwapLE64(X) SDL_Swap64(X)
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235 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
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236 #define SDL_SwapBE16(X) (X)
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237 #define SDL_SwapBE32(X) (X)
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238 #define SDL_SwapBE64(X) (X)
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239 #define SDL_SwapFloatBE(X) (X)
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240 #endif
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241 /*@}*//*Swap to native*/
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242
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243 /* Ends C function definitions when using C++ */
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244 #ifdef __cplusplus
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245 /* *INDENT-OFF* */
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246 }
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247 /* *INDENT-ON* */
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248 #endif
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249 #include "close_code.h"
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250
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251 #endif /* _SDL_endian_h */
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252
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253 /* vi: set ts=4 sw=4 expandtab: */