Mercurial > sdl-ios-xcode

annotate include/SDL_endian.h @ 2427:32b9909db651 gsoc2008_iphone

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changed macro MAX_G_FORCE to SDL_IPHONE_MAX_GFORCE and moved it to the SDL_config_iphoneos.h file. This should allow users to convert between the Sint16 returned by polling the joystick and units of g-force, which better describe what is going on with the iPhone (and are what the iPhone OS actually gives you). This conversion wouldn't be necessary except that we'd need floating point to store everything as g-force.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Fri, 15 Aug 2008 00:46:58 +0000
parents 8055185ae4ed
children e1da92da346c 99210400e8b9
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /* 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
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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 */
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49
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50
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51 #include "begin_code.h"
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52 /* Set up for C function definitions, even when using C++ */
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53 #ifdef __cplusplus
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54 /* *INDENT-OFF* */
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55 extern "C" {
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56 /* *INDENT-ON* */
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57 #endif
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58
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59 /* Use inline functions for compilers that support them, and static
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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
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62 header should only be included in files that actually use them.
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63 */
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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));
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100 }
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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
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141 }
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142 #endif
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143
0
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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;
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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
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184 }
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185 #endif
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186 #else
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187 /* This is mainly to keep compilers from complaining in SDL code.
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188 If there is no real 64-bit datatype, then compilers will complain about
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189 the fake 64-bit datatype that SDL provides when it compiles user code.
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190 */
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191 #define SDL_Swap64(X) (X)
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192 #endif /* SDL_HAS_64BIT_TYPE */
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193
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194
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195 static __inline__ float
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196 SDL_SwapFloat(float x)
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197 {
1985
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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;
1984
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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
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209 /* Byteswap item from the specified endianness to the native endianness */
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210 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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211 #define SDL_SwapLE16(X) (X)
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212 #define SDL_SwapLE32(X) (X)
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213 #define SDL_SwapLE64(X) (X)
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214 #define SDL_SwapFloatLE(X) (X)
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215 #define SDL_SwapBE16(X) SDL_Swap16(X)
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216 #define SDL_SwapBE32(X) SDL_Swap32(X)
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217 #define SDL_SwapBE64(X) SDL_Swap64(X)
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218 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
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219 #else
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220 #define SDL_SwapLE16(X) SDL_Swap16(X)
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221 #define SDL_SwapLE32(X) SDL_Swap32(X)
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222 #define SDL_SwapLE64(X) SDL_Swap64(X)
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223 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
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224 #define SDL_SwapBE16(X) (X)
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225 #define SDL_SwapBE32(X) (X)
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226 #define SDL_SwapBE64(X) (X)
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227 #define SDL_SwapFloatBE(X) (X)
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228 #endif
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229
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230 /* Ends C function definitions when using C++ */
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231 #ifdef __cplusplus
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232 /* *INDENT-OFF* */
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233 }
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234 /* *INDENT-ON* */
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235 #endif
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236 #include "close_code.h"
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237
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238 #endif /* _SDL_endian_h */
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239
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240 /* vi: set ts=4 sw=4 expandtab: */