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annotate include/SDL_endian.h @ 4495:dbbfdb9ea716

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Simplified clipboard API for sanity's sake. A complete clipboard implementation would support multiple formats that could be queried at runtime, events for when the clipboard contents changed, support for HTML, images, etc. We're not going that crazy, at least for now. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 07 Jul 2010 23:54:03 -0700
parents ab63fdcf66af
children 116f05eb67c7
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 #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__)) && !defined(__mcoldfire__)
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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 SDL_static_cast(Uint16, ((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__)) && !defined(__mcoldfire__)
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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 SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
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147 ((x >> 8) & 0x0000FF00) | (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: */