Miguel Ruiz / SDL_lib2

SDL Library

Dependents:   H261_decoder

SDL_endian.h@0:7fb6877b5d7c, 2016-09-22 (annotated)

Committer:
miruga27
Date:
Thu Sep 22 00:03:09 2016 +0000
Revision:
0:7fb6877b5d7c
SDL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
miruga27 0:7fb6877b5d7c 1 /*
miruga27 0:7fb6877b5d7c 2 Simple DirectMedia Layer
miruga27 0:7fb6877b5d7c 3 Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
miruga27 0:7fb6877b5d7c 4
miruga27 0:7fb6877b5d7c 5 This software is provided 'as-is', without any express or implied
miruga27 0:7fb6877b5d7c 6 warranty. In no event will the authors be held liable for any damages
miruga27 0:7fb6877b5d7c 7 arising from the use of this software.
miruga27 0:7fb6877b5d7c 8
miruga27 0:7fb6877b5d7c 9 Permission is granted to anyone to use this software for any purpose,
miruga27 0:7fb6877b5d7c 10 including commercial applications, and to alter it and redistribute it
miruga27 0:7fb6877b5d7c 11 freely, subject to the following restrictions:
miruga27 0:7fb6877b5d7c 12
miruga27 0:7fb6877b5d7c 13 1. The origin of this software must not be misrepresented; you must not
miruga27 0:7fb6877b5d7c 14 claim that you wrote the original software. If you use this software
miruga27 0:7fb6877b5d7c 15 in a product, an acknowledgment in the product documentation would be
miruga27 0:7fb6877b5d7c 16 appreciated but is not required.
miruga27 0:7fb6877b5d7c 17 2. Altered source versions must be plainly marked as such, and must not be
miruga27 0:7fb6877b5d7c 18 misrepresented as being the original software.
miruga27 0:7fb6877b5d7c 19 3. This notice may not be removed or altered from any source distribution.
miruga27 0:7fb6877b5d7c 20 */
miruga27 0:7fb6877b5d7c 21
miruga27 0:7fb6877b5d7c 22 /**
miruga27 0:7fb6877b5d7c 23 * \file SDL_endian.h
miruga27 0:7fb6877b5d7c 24 *
miruga27 0:7fb6877b5d7c 25 * Functions for reading and writing endian-specific values
miruga27 0:7fb6877b5d7c 26 */
miruga27 0:7fb6877b5d7c 27
miruga27 0:7fb6877b5d7c 28 #ifndef _SDL_endian_h
miruga27 0:7fb6877b5d7c 29 #define _SDL_endian_h
miruga27 0:7fb6877b5d7c 30
miruga27 0:7fb6877b5d7c 31 #include "SDL_stdinc.h"
miruga27 0:7fb6877b5d7c 32
miruga27 0:7fb6877b5d7c 33 /**
miruga27 0:7fb6877b5d7c 34 * \name The two types of endianness
miruga27 0:7fb6877b5d7c 35 */
miruga27 0:7fb6877b5d7c 36 /* @{ */
miruga27 0:7fb6877b5d7c 37 #define SDL_LIL_ENDIAN 1234
miruga27 0:7fb6877b5d7c 38 #define SDL_BIG_ENDIAN 4321
miruga27 0:7fb6877b5d7c 39 /* @} */
miruga27 0:7fb6877b5d7c 40
miruga27 0:7fb6877b5d7c 41 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
miruga27 0:7fb6877b5d7c 42 #ifdef __linux__
miruga27 0:7fb6877b5d7c 43 #include <endian.h>
miruga27 0:7fb6877b5d7c 44 #define SDL_BYTEORDER __BYTE_ORDER
miruga27 0:7fb6877b5d7c 45 #else /* __linux __ */
miruga27 0:7fb6877b5d7c 46 #if defined(__hppa__) || \
miruga27 0:7fb6877b5d7c 47 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
miruga27 0:7fb6877b5d7c 48 (defined(__MIPS__) && defined(__MISPEB__)) || \
miruga27 0:7fb6877b5d7c 49 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
miruga27 0:7fb6877b5d7c 50 defined(__sparc__)
miruga27 0:7fb6877b5d7c 51 #define SDL_BYTEORDER SDL_BIG_ENDIAN
miruga27 0:7fb6877b5d7c 52 #else
miruga27 0:7fb6877b5d7c 53 #define SDL_BYTEORDER SDL_LIL_ENDIAN
miruga27 0:7fb6877b5d7c 54 #endif
miruga27 0:7fb6877b5d7c 55 #endif /* __linux __ */
miruga27 0:7fb6877b5d7c 56 #endif /* !SDL_BYTEORDER */
miruga27 0:7fb6877b5d7c 57
miruga27 0:7fb6877b5d7c 58
miruga27 0:7fb6877b5d7c 59 #include "begin_code.h"
miruga27 0:7fb6877b5d7c 60 /* Set up for C function definitions, even when using C++ */
miruga27 0:7fb6877b5d7c 61 #ifdef __cplusplus
miruga27 0:7fb6877b5d7c 62 extern "C" {
miruga27 0:7fb6877b5d7c 63 #endif
miruga27 0:7fb6877b5d7c 64
miruga27 0:7fb6877b5d7c 65 /**
miruga27 0:7fb6877b5d7c 66 * \file SDL_endian.h
miruga27 0:7fb6877b5d7c 67 */
miruga27 0:7fb6877b5d7c 68 #if defined(__GNUC__) && defined(__i386__) && \
miruga27 0:7fb6877b5d7c 69 !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
miruga27 0:7fb6877b5d7c 70 SDL_FORCE_INLINE Uint16
miruga27 0:7fb6877b5d7c 71 SDL_Swap16(Uint16 x)
miruga27 0:7fb6877b5d7c 72 {
miruga27 0:7fb6877b5d7c 73 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x));
miruga27 0:7fb6877b5d7c 74 return x;
miruga27 0:7fb6877b5d7c 75 }
miruga27 0:7fb6877b5d7c 76 #elif defined(__GNUC__) && defined(__x86_64__)
miruga27 0:7fb6877b5d7c 77 SDL_FORCE_INLINE Uint16
miruga27 0:7fb6877b5d7c 78 SDL_Swap16(Uint16 x)
miruga27 0:7fb6877b5d7c 79 {
miruga27 0:7fb6877b5d7c 80 __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x));
miruga27 0:7fb6877b5d7c 81 return x;
miruga27 0:7fb6877b5d7c 82 }
miruga27 0:7fb6877b5d7c 83 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
miruga27 0:7fb6877b5d7c 84 SDL_FORCE_INLINE Uint16
miruga27 0:7fb6877b5d7c 85 SDL_Swap16(Uint16 x)
miruga27 0:7fb6877b5d7c 86 {
miruga27 0:7fb6877b5d7c 87 int result;
miruga27 0:7fb6877b5d7c 88
miruga27 0:7fb6877b5d7c 89 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x));
miruga27 0:7fb6877b5d7c 90 return (Uint16)result;
miruga27 0:7fb6877b5d7c 91 }
miruga27 0:7fb6877b5d7c 92 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
miruga27 0:7fb6877b5d7c 93 SDL_FORCE_INLINE Uint16
miruga27 0:7fb6877b5d7c 94 SDL_Swap16(Uint16 x)
miruga27 0:7fb6877b5d7c 95 {
miruga27 0:7fb6877b5d7c 96 __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc");
miruga27 0:7fb6877b5d7c 97 return x;
miruga27 0:7fb6877b5d7c 98 }
miruga27 0:7fb6877b5d7c 99 #else
miruga27 0:7fb6877b5d7c 100 SDL_FORCE_INLINE Uint16
miruga27 0:7fb6877b5d7c 101 SDL_Swap16(Uint16 x)
miruga27 0:7fb6877b5d7c 102 {
miruga27 0:7fb6877b5d7c 103 return SDL_static_cast(Uint16, ((x << 8) | (x >> 8)));
miruga27 0:7fb6877b5d7c 104 }
miruga27 0:7fb6877b5d7c 105 #endif
miruga27 0:7fb6877b5d7c 106
miruga27 0:7fb6877b5d7c 107 #if defined(__GNUC__) && defined(__i386__)
miruga27 0:7fb6877b5d7c 108 SDL_FORCE_INLINE Uint32
miruga27 0:7fb6877b5d7c 109 SDL_Swap32(Uint32 x)
miruga27 0:7fb6877b5d7c 110 {
miruga27 0:7fb6877b5d7c 111 __asm__("bswap %0": "=r"(x):"0"(x));
miruga27 0:7fb6877b5d7c 112 return x;
miruga27 0:7fb6877b5d7c 113 }
miruga27 0:7fb6877b5d7c 114 #elif defined(__GNUC__) && defined(__x86_64__)
miruga27 0:7fb6877b5d7c 115 SDL_FORCE_INLINE Uint32
miruga27 0:7fb6877b5d7c 116 SDL_Swap32(Uint32 x)
miruga27 0:7fb6877b5d7c 117 {
miruga27 0:7fb6877b5d7c 118 __asm__("bswapl %0": "=r"(x):"0"(x));
miruga27 0:7fb6877b5d7c 119 return x;
miruga27 0:7fb6877b5d7c 120 }
miruga27 0:7fb6877b5d7c 121 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
miruga27 0:7fb6877b5d7c 122 SDL_FORCE_INLINE Uint32
miruga27 0:7fb6877b5d7c 123 SDL_Swap32(Uint32 x)
miruga27 0:7fb6877b5d7c 124 {
miruga27 0:7fb6877b5d7c 125 Uint32 result;
miruga27 0:7fb6877b5d7c 126
miruga27 0:7fb6877b5d7c 127 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x));
miruga27 0:7fb6877b5d7c 128 __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x));
miruga27 0:7fb6877b5d7c 129 __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x));
miruga27 0:7fb6877b5d7c 130 return result;
miruga27 0:7fb6877b5d7c 131 }
miruga27 0:7fb6877b5d7c 132 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__)
miruga27 0:7fb6877b5d7c 133 SDL_FORCE_INLINE Uint32
miruga27 0:7fb6877b5d7c 134 SDL_Swap32(Uint32 x)
miruga27 0:7fb6877b5d7c 135 {
miruga27 0:7fb6877b5d7c 136 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc");
miruga27 0:7fb6877b5d7c 137 return x;
miruga27 0:7fb6877b5d7c 138 }
miruga27 0:7fb6877b5d7c 139 #else
miruga27 0:7fb6877b5d7c 140 SDL_FORCE_INLINE Uint32
miruga27 0:7fb6877b5d7c 141 SDL_Swap32(Uint32 x)
miruga27 0:7fb6877b5d7c 142 {
miruga27 0:7fb6877b5d7c 143 return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) |
miruga27 0:7fb6877b5d7c 144 ((x >> 8) & 0x0000FF00) | (x >> 24)));
miruga27 0:7fb6877b5d7c 145 }
miruga27 0:7fb6877b5d7c 146 #endif
miruga27 0:7fb6877b5d7c 147
miruga27 0:7fb6877b5d7c 148 #if defined(__GNUC__) && defined(__i386__)
miruga27 0:7fb6877b5d7c 149 SDL_FORCE_INLINE Uint64
miruga27 0:7fb6877b5d7c 150 SDL_Swap64(Uint64 x)
miruga27 0:7fb6877b5d7c 151 {
miruga27 0:7fb6877b5d7c 152 union
miruga27 0:7fb6877b5d7c 153 {
miruga27 0:7fb6877b5d7c 154 struct
miruga27 0:7fb6877b5d7c 155 {
miruga27 0:7fb6877b5d7c 156 Uint32 a, b;
miruga27 0:7fb6877b5d7c 157 } s;
miruga27 0:7fb6877b5d7c 158 Uint64 u;
miruga27 0:7fb6877b5d7c 159 } v;
miruga27 0:7fb6877b5d7c 160 v.u = x;
miruga27 0:7fb6877b5d7c 161 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a),
miruga27 0:7fb6877b5d7c 162 "1"(v.s.
miruga27 0:7fb6877b5d7c 163 b));
miruga27 0:7fb6877b5d7c 164 return v.u;
miruga27 0:7fb6877b5d7c 165 }
miruga27 0:7fb6877b5d7c 166 #elif defined(__GNUC__) && defined(__x86_64__)
miruga27 0:7fb6877b5d7c 167 SDL_FORCE_INLINE Uint64
miruga27 0:7fb6877b5d7c 168 SDL_Swap64(Uint64 x)
miruga27 0:7fb6877b5d7c 169 {
miruga27 0:7fb6877b5d7c 170 __asm__("bswapq %0": "=r"(x):"0"(x));
miruga27 0:7fb6877b5d7c 171 return x;
miruga27 0:7fb6877b5d7c 172 }
miruga27 0:7fb6877b5d7c 173 #else
miruga27 0:7fb6877b5d7c 174 SDL_FORCE_INLINE Uint64
miruga27 0:7fb6877b5d7c 175 SDL_Swap64(Uint64 x)
miruga27 0:7fb6877b5d7c 176 {
miruga27 0:7fb6877b5d7c 177 Uint32 hi, lo;
miruga27 0:7fb6877b5d7c 178
miruga27 0:7fb6877b5d7c 179 /* Separate into high and low 32-bit values and swap them */
miruga27 0:7fb6877b5d7c 180 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
miruga27 0:7fb6877b5d7c 181 x >>= 32;
miruga27 0:7fb6877b5d7c 182 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF);
miruga27 0:7fb6877b5d7c 183 x = SDL_Swap32(lo);
miruga27 0:7fb6877b5d7c 184 x <<= 32;
miruga27 0:7fb6877b5d7c 185 x |= SDL_Swap32(hi);
miruga27 0:7fb6877b5d7c 186 return (x);
miruga27 0:7fb6877b5d7c 187 }
miruga27 0:7fb6877b5d7c 188 #endif
miruga27 0:7fb6877b5d7c 189
miruga27 0:7fb6877b5d7c 190
miruga27 0:7fb6877b5d7c 191 SDL_FORCE_INLINE float
miruga27 0:7fb6877b5d7c 192 SDL_SwapFloat(float x)
miruga27 0:7fb6877b5d7c 193 {
miruga27 0:7fb6877b5d7c 194 union
miruga27 0:7fb6877b5d7c 195 {
miruga27 0:7fb6877b5d7c 196 float f;
miruga27 0:7fb6877b5d7c 197 Uint32 ui32;
miruga27 0:7fb6877b5d7c 198 } swapper;
miruga27 0:7fb6877b5d7c 199 swapper.f = x;
miruga27 0:7fb6877b5d7c 200 swapper.ui32 = SDL_Swap32(swapper.ui32);
miruga27 0:7fb6877b5d7c 201 return swapper.f;
miruga27 0:7fb6877b5d7c 202 }
miruga27 0:7fb6877b5d7c 203
miruga27 0:7fb6877b5d7c 204
miruga27 0:7fb6877b5d7c 205 /**
miruga27 0:7fb6877b5d7c 206 * \name Swap to native
miruga27 0:7fb6877b5d7c 207 * Byteswap item from the specified endianness to the native endianness.
miruga27 0:7fb6877b5d7c 208 */
miruga27 0:7fb6877b5d7c 209 /* @{ */
miruga27 0:7fb6877b5d7c 210 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
miruga27 0:7fb6877b5d7c 211 #define SDL_SwapLE16(X) (X)
miruga27 0:7fb6877b5d7c 212 #define SDL_SwapLE32(X) (X)
miruga27 0:7fb6877b5d7c 213 #define SDL_SwapLE64(X) (X)
miruga27 0:7fb6877b5d7c 214 #define SDL_SwapFloatLE(X) (X)
miruga27 0:7fb6877b5d7c 215 #define SDL_SwapBE16(X) SDL_Swap16(X)
miruga27 0:7fb6877b5d7c 216 #define SDL_SwapBE32(X) SDL_Swap32(X)
miruga27 0:7fb6877b5d7c 217 #define SDL_SwapBE64(X) SDL_Swap64(X)
miruga27 0:7fb6877b5d7c 218 #define SDL_SwapFloatBE(X) SDL_SwapFloat(X)
miruga27 0:7fb6877b5d7c 219 #else
miruga27 0:7fb6877b5d7c 220 #define SDL_SwapLE16(X) SDL_Swap16(X)
miruga27 0:7fb6877b5d7c 221 #define SDL_SwapLE32(X) SDL_Swap32(X)
miruga27 0:7fb6877b5d7c 222 #define SDL_SwapLE64(X) SDL_Swap64(X)
miruga27 0:7fb6877b5d7c 223 #define SDL_SwapFloatLE(X) SDL_SwapFloat(X)
miruga27 0:7fb6877b5d7c 224 #define SDL_SwapBE16(X) (X)
miruga27 0:7fb6877b5d7c 225 #define SDL_SwapBE32(X) (X)
miruga27 0:7fb6877b5d7c 226 #define SDL_SwapBE64(X) (X)
miruga27 0:7fb6877b5d7c 227 #define SDL_SwapFloatBE(X) (X)
miruga27 0:7fb6877b5d7c 228 #endif
miruga27 0:7fb6877b5d7c 229 /* @} *//* Swap to native */
miruga27 0:7fb6877b5d7c 230
miruga27 0:7fb6877b5d7c 231 /* Ends C function definitions when using C++ */
miruga27 0:7fb6877b5d7c 232 #ifdef __cplusplus
miruga27 0:7fb6877b5d7c 233 }
miruga27 0:7fb6877b5d7c 234 #endif
miruga27 0:7fb6877b5d7c 235 #include "close_code.h"
miruga27 0:7fb6877b5d7c 236
miruga27 0:7fb6877b5d7c 237 #endif /* _SDL_endian_h */
miruga27 0:7fb6877b5d7c 238
miruga27 0:7fb6877b5d7c 239 /* vi: set ts=4 sw=4 expandtab: */