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annotate include/SDL_endian.h @ 5213:1be088cec098

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At least allow returning the values that were set.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 06 Feb 2011 10:24:08 -0800
parents 116f05eb67c7
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 #ifdef __linux__
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44 #include <endian.h>
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45 #define SDL_BYTEORDER __BYTE_ORDER
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46 #else /* __linux __ */
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47 #if defined(__hppa__) || \
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48 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
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49 (defined(__MIPS__) && defined(__MISPEB__)) || \
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50 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
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51 defined(__sparc__)
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52 #define SDL_BYTEORDER SDL_BIG_ENDIAN
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53 #else
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54 #define SDL_BYTEORDER SDL_LIL_ENDIAN
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55 #endif
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56 #endif /* __linux __ */
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57 #endif /* !SDL_BYTEORDER */
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58
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59
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60 #include "begin_code.h"
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61 /* Set up for C function definitions, even when using C++ */
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62 #ifdef __cplusplus
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63 /* *INDENT-OFF* */
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64 extern "C" {
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65 /* *INDENT-ON* */
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66 #endif
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67
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68 /**
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69 * \file SDL_endian.h
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70 *
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71 * Uses inline functions for compilers that support them, and static
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72 * functions for those that do not. Because these functions become
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73 * static for compilers that do not support inline functions, this
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74 * header should only be included in files that actually use them.
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75 */
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76 #if defined(__GNUC__) && defined(__i386__) && \
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77 !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
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78 static __inline__ Uint16
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79 SDL_Swap16(Uint16 x)
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80 {
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81 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
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82 return x;
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83 }
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84 #elif defined(__GNUC__) && defined(__x86_64__)
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85 static __inline__ Uint16
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86 SDL_Swap16(Uint16 x)
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87 {
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88 __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
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89 return x;
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90 }
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91 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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92 static __inline__ Uint16
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93 SDL_Swap16(Uint16 x)
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94 {
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95 Uint16 result;
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96
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97 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
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98 return result;
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99 }
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100 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
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101 static __inline__ Uint16
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102 SDL_Swap16(Uint16 x)
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103 {
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104 __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
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105 return x;
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106 }
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107 #else
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108 static __inline__ Uint16
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109 SDL_Swap16(Uint16 x)
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110 {
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111 return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
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112 }
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113 #endif
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114
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115 #if defined(__GNUC__) && defined(__i386__)
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116 static __inline__ Uint32
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117 SDL_Swap32(Uint32 x)
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118 {
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119 __asm__("bswap %0": "=r"(x):"0"(x));
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120 return x;
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121 }
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122 #elif defined(__GNUC__) && defined(__x86_64__)
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123 static __inline__ Uint32
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124 SDL_Swap32(Uint32 x)
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125 {
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126 __asm__("bswapl %0": "=r"(x):"0"(x));
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127 return x;
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128 }
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129 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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130 static __inline__ Uint32
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131 SDL_Swap32(Uint32 x)
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132 {
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133 Uint32 result;
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134
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135 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
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136 __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
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137 __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
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138 return result;
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139 }
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140 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
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141 static __inline__ Uint32
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142 SDL_Swap32(Uint32 x)
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143 {
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144 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
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145 return x;
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146 }
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147 #else
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148 static __inline__ Uint32
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149 SDL_Swap32(Uint32 x)
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150 {
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151 return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
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152 ((x >> 8) & 0x0000FF00) | (x >> 24)));
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153 }
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154 #endif
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155
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156 #ifdef SDL_HAS_64BIT_TYPE
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157 #if defined(__GNUC__) && defined(__i386__)
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158 static __inline__ Uint64
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159 SDL_Swap64(Uint64 x)
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160 {
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161 union
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162 {
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163 struct
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164 {
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165 Uint32 a, b;
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166 } s;
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167 Uint64 u;
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168 } v;
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169 v.u = x;
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170 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
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171 "1"(v.s.
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172 b));
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173 return v.u;
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174 }
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175 #elif defined(__GNUC__) && defined(__x86_64__)
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176 static __inline__ Uint64
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177 SDL_Swap64(Uint64 x)
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178 {
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179 __asm__("bswapq %0": "=r"(x):"0"(x));
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180 return x;
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181 }
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182 #else
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183 static __inline__ Uint64
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184 SDL_Swap64(Uint64 x)
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185 {
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186 Uint32 hi, lo;
0
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187
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188 /* Separate into high and low 32-bit values and swap them */
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189 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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190 x >>= 32;
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191 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
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192 x = SDL_Swap32(lo);
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193 x <<= 32;
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194 x |= SDL_Swap32(hi);
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195 return (x);
0
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196 }
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197 #endif
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198 #else
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199 /**
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200 * This is mainly to keep compilers from complaining in SDL code.
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201 * If there is no real 64-bit datatype, then compilers will complain about
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202 * the fake 64-bit datatype that SDL provides when it compiles user code.
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203 */
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204 #define SDL_Swap64(X) (X)
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205 #endif /* SDL_HAS_64BIT_TYPE */
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206
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207
1984
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208 static __inline__ float
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209 SDL_SwapFloat(float x)
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210 {
1985
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211 union
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212 {
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213 float f;
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214 Uint32 ui32;
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215 } swapper;
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216 swapper.f = x;
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217 swapper.ui32 = SDL_Swap32(swapper.ui32);
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218 return swapper.f;
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219 }
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220
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221
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222 /**
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223 * \name Swap to native
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224 * Byteswap item from the specified endianness to the native endianness.
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225 */
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226 /*@{*/
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227 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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228 #define SDL_SwapLE16(X) (X)
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229 #define SDL_SwapLE32(X) (X)
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230 #define SDL_SwapLE64(X) (X)
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231 #define SDL_SwapFloatLE(X) (X)
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232 #define SDL_SwapBE16(X) SDL_Swap16(X)
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233 #define SDL_SwapBE32(X) SDL_Swap32(X)
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234 #define SDL_SwapBE64(X) SDL_Swap64(X)
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235 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
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236 #else
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237 #define SDL_SwapLE16(X) SDL_Swap16(X)
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238 #define SDL_SwapLE32(X) SDL_Swap32(X)
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239 #define SDL_SwapLE64(X) SDL_Swap64(X)
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240 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
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241 #define SDL_SwapBE16(X) (X)
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242 #define SDL_SwapBE32(X) (X)
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243 #define SDL_SwapBE64(X) (X)
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244 #define SDL_SwapFloatBE(X) (X)
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245 #endif
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246 /*@}*//*Swap to native*/
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247
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248 /* Ends C function definitions when using C++ */
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249 #ifdef __cplusplus
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250 /* *INDENT-OFF* */
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251 }
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252 /* *INDENT-ON* */
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253 #endif
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254 #include "close_code.h"
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255
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256 #endif /* _SDL_endian_h */
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257
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258 /* vi: set ts=4 sw=4 expandtab: */