Mercurial > sdl-ios-xcode
annotate include/SDL_endian.h @ 2188:0e751c1f83f5
Disable video extensions atm
author | Patrice Mandin <patmandin@gmail.com> |
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date | Fri, 13 Jul 2007 22:52:53 +0000 |
parents | 8055185ae4ed |
children | e1da92da346c 99210400e8b9 |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
0 | 4 |
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 |
0 | 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. |
0 | 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 | |
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13 Lesser General Public License for more details. |
0 | 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 |
0 | 18 |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
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 */ |
0 | 28 |
29 #ifndef _SDL_endian_h | |
30 #define _SDL_endian_h | |
31 | |
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32 #include "SDL_stdinc.h" |
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33 |
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34 /* The two types of endianness */ |
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35 #define SDL_LIL_ENDIAN 1234 |
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36 #define SDL_BIG_ENDIAN 4321 |
0 | 37 |
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38 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ |
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39 #if defined(__hppa__) || \ |
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40 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ |
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41 (defined(__MIPS__) && defined(__MISPEB__)) || \ |
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42 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ |
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43 defined(__sparc__) |
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44 #define SDL_BYTEORDER SDL_BIG_ENDIAN |
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45 #else |
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46 #define SDL_BYTEORDER SDL_LIL_ENDIAN |
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47 #endif |
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48 #endif /* !SDL_BYTEORDER */ |
0 | 49 |
50 | |
51 #include "begin_code.h" | |
52 /* Set up for C function definitions, even when using C++ */ | |
53 #ifdef __cplusplus | |
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54 /* *INDENT-OFF* */ |
0 | 55 extern "C" { |
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56 /* *INDENT-ON* */ |
0 | 57 #endif |
58 | |
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59 /* Use inline functions for compilers that support them, and static |
0 | 60 functions for those that do not. Because these functions become |
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61 static for compilers that do not support inline functions, this |
0 | 62 header should only be included in files that actually use them. |
63 */ | |
1372 | 64 #if defined(__GNUC__) && defined(__i386__) && \ |
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65 !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */) |
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66 static __inline__ Uint16 |
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67 SDL_Swap16(Uint16 x) |
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68 { |
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69 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); |
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70 return x; |
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71 } |
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72 #elif defined(__GNUC__) && defined(__x86_64__) |
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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(__powerpc__) || defined(__ppc__)) |
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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 Uint16 result; |
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84 |
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85 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); |
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86 return result; |
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87 } |
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88 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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89 static __inline__ Uint16 |
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90 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 |
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97 SDL_Swap16(Uint16 x) |
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98 { |
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99 return ((x << 8) | (x >> 8)); |
0 | 100 } |
101 #endif | |
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102 |
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103 #if defined(__GNUC__) && defined(__i386__) |
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104 static __inline__ Uint32 |
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105 SDL_Swap32(Uint32 x) |
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106 { |
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107 __asm__("bswap %0": "=r"(x):"0"(x)); |
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108 return x; |
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109 } |
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110 #elif defined(__GNUC__) && defined(__x86_64__) |
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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__("bswapl %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(__powerpc__) || defined(__ppc__)) |
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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 Uint32 result; |
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122 |
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123 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x)); |
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124 __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x)); |
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125 __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x)); |
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126 return result; |
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127 } |
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128 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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129 static __inline__ Uint32 |
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130 SDL_Swap32(Uint32 x) |
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131 { |
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132 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); |
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133 return x; |
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134 } |
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135 #else |
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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 return ((x << 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | |
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140 (x >> 24)); |
0 | 141 } |
142 #endif | |
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143 |
0 | 144 #ifdef SDL_HAS_64BIT_TYPE |
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145 #if defined(__GNUC__) && defined(__i386__) |
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146 static __inline__ Uint64 |
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147 SDL_Swap64(Uint64 x) |
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148 { |
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149 union |
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150 { |
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151 struct |
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152 { |
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153 Uint32 a, b; |
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154 } s; |
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155 Uint64 u; |
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156 } v; |
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157 v.u = x; |
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158 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a), |
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159 "1"(v.s. |
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160 b)); |
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161 return v.u; |
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162 } |
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163 #elif defined(__GNUC__) && defined(__x86_64__) |
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164 static __inline__ Uint64 |
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165 SDL_Swap64(Uint64 x) |
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166 { |
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167 __asm__("bswapq %0": "=r"(x):"0"(x)); |
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168 return x; |
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169 } |
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170 #else |
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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 Uint32 hi, lo; |
0 | 175 |
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176 /* Separate into high and low 32-bit values and swap them */ |
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177 lo = (Uint32) (x & 0xFFFFFFFF); |
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178 x >>= 32; |
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179 hi = (Uint32) (x & 0xFFFFFFFF); |
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180 x = SDL_Swap32(lo); |
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181 x <<= 32; |
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182 x |= SDL_Swap32(hi); |
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183 return (x); |
0 | 184 } |
185 #endif | |
186 #else | |
187 /* This is mainly to keep compilers from complaining in SDL code. | |
188 If there is no real 64-bit datatype, then compilers will complain about | |
189 the fake 64-bit datatype that SDL provides when it compiles user code. | |
190 */ | |
191 #define SDL_Swap64(X) (X) | |
192 #endif /* SDL_HAS_64BIT_TYPE */ | |
193 | |
194 | |
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195 static __inline__ float |
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196 SDL_SwapFloat(float x) |
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197 { |
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198 union |
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199 { |
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200 float f; |
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201 Uint32 ui32; |
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202 } swapper; |
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203 swapper.f = x; |
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204 swapper.ui32 = SDL_Swap32(swapper.ui32); |
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205 return swapper.f; |
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206 } |
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207 |
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208 |
0 | 209 /* Byteswap item from the specified endianness to the native endianness */ |
210 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
211 #define SDL_SwapLE16(X) (X) | |
212 #define SDL_SwapLE32(X) (X) | |
213 #define SDL_SwapLE64(X) (X) | |
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214 #define SDL_SwapFloatLE(X) (X) |
0 | 215 #define SDL_SwapBE16(X) SDL_Swap16(X) |
216 #define SDL_SwapBE32(X) SDL_Swap32(X) | |
217 #define SDL_SwapBE64(X) SDL_Swap64(X) | |
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218 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X) |
0 | 219 #else |
220 #define SDL_SwapLE16(X) SDL_Swap16(X) | |
221 #define SDL_SwapLE32(X) SDL_Swap32(X) | |
222 #define SDL_SwapLE64(X) SDL_Swap64(X) | |
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223 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X) |
0 | 224 #define SDL_SwapBE16(X) (X) |
225 #define SDL_SwapBE32(X) (X) | |
226 #define SDL_SwapBE64(X) (X) | |
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227 #define SDL_SwapFloatBE(X) (X) |
0 | 228 #endif |
229 | |
230 /* Ends C function definitions when using C++ */ | |
231 #ifdef __cplusplus | |
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232 /* *INDENT-OFF* */ |
0 | 233 } |
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234 /* *INDENT-ON* */ |
0 | 235 #endif |
236 #include "close_code.h" | |
237 | |
238 #endif /* _SDL_endian_h */ | |
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239 |
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240 /* vi: set ts=4 sw=4 expandtab: */ |