Atlas - SDL_endian.h
Home / ext / SDL / include / SDL3 Lines: 4 | Size: 20162 bytes [Download] [Show on GitHub] [Search similar files] [Raw] [Raw (proxy)][FILE BEGIN]1/* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2026 Sam Lantinga <[email protected]> 4 5 This software is provided 'as-is', without any express or implied 6 warranty. In no event will the authors be held liable for any damages 7 arising from the use of this software. 8 9 Permission is granted to anyone to use this software for any purpose, 10 including commercial applications, and to alter it and redistribute it 11 freely, subject to the following restrictions: 12 13 1. The origin of this software must not be misrepresented; you must not 14 claim that you wrote the original software. If you use this software 15 in a product, an acknowledgment in the product documentation would be 16 appreciated but is not required. 17 2. Altered source versions must be plainly marked as such, and must not be 18 misrepresented as being the original software. 19 3. This notice may not be removed or altered from any source distribution. 20*/ 21 22/** 23 * # CategoryEndian 24 * 25 * Functions converting endian-specific values to different byte orders. 26 * 27 * These functions either unconditionally swap byte order (SDL_Swap16, 28 * SDL_Swap32, SDL_Swap64, SDL_SwapFloat), or they swap to/from the system's 29 * native byte order (SDL_Swap16LE, SDL_Swap16BE, SDL_Swap32LE, SDL_Swap32BE, 30 * SDL_Swap32LE, SDL_Swap32BE, SDL_SwapFloatLE, SDL_SwapFloatBE). In the 31 * latter case, the functionality is provided by macros that become no-ops if 32 * a swap isn't necessary: on an x86 (littleendian) processor, SDL_Swap32LE 33 * does nothing, but SDL_Swap32BE reverses the bytes of the data. On a PowerPC 34 * processor (bigendian), the macros behavior is reversed. 35 * 36 * The swap routines are inline functions, and attempt to use compiler 37 * intrinsics, inline assembly, and other magic to make byteswapping 38 * efficient. 39 */ 40 41#ifndef SDL_endian_h_ 42#define SDL_endian_h_ 43 44#include <SDL3/SDL_stdinc.h> 45 46#if defined(_MSC_VER) && (_MSC_VER >= 1400) 47/* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version, 48 so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */ 49#if defined(__clang__) && !SDL_HAS_BUILTIN(_m_prefetch) 50#ifndef __PRFCHWINTRIN_H 51#define __PRFCHWINTRIN_H 52static __inline__ void __attribute__((__always_inline__, __nodebug__)) 53_m_prefetch(void *__P) 54{ 55 __builtin_prefetch(__P, 0, 3 /* _MM_HINT_T0 */); 56} 57#endif /* __PRFCHWINTRIN_H */ 58#endif /* __clang__ */ 59 60#include <intrin.h> 61#endif 62 63/** 64 * \name The two types of endianness 65 */ 66/* @{ */ 67 68 69/** 70 * A value to represent littleendian byteorder. 71 * 72 * This is used with the preprocessor macro SDL_BYTEORDER, to determine a 73 * platform's byte ordering: 74 * 75 * ```c 76 * #if SDL_BYTEORDER == SDL_LIL_ENDIAN 77 * SDL_Log("This system is littleendian."); 78 * #endif 79 * ``` 80 * 81 * \since This macro is available since SDL 3.2.0. 82 * 83 * \sa SDL_BYTEORDER 84 * \sa SDL_BIG_ENDIAN 85 */ 86#define SDL_LIL_ENDIAN 1234 87 88/** 89 * A value to represent bigendian byteorder. 90 * 91 * This is used with the preprocessor macro SDL_BYTEORDER, to determine a 92 * platform's byte ordering: 93 * 94 * ```c 95 * #if SDL_BYTEORDER == SDL_BIG_ENDIAN 96 * SDL_Log("This system is bigendian."); 97 * #endif 98 * ``` 99 * 100 * \since This macro is available since SDL 3.2.0. 101 * 102 * \sa SDL_BYTEORDER 103 * \sa SDL_LIL_ENDIAN 104 */ 105#define SDL_BIG_ENDIAN 4321 106 107/* @} */ 108 109#ifndef SDL_BYTEORDER 110#ifdef SDL_WIKI_DOCUMENTATION_SECTION 111 112/** 113 * A macro that reports the target system's byte order. 114 * 115 * This is set to either SDL_LIL_ENDIAN or SDL_BIG_ENDIAN (and maybe other 116 * values in the future, if something else becomes popular). This can be 117 * tested with the preprocessor, so decisions can be made at compile time. 118 * 119 * ```c 120 * #if SDL_BYTEORDER == SDL_BIG_ENDIAN 121 * SDL_Log("This system is bigendian."); 122 * #endif 123 * ``` 124 * 125 * \since This macro is available since SDL 3.2.0. 126 * 127 * \sa SDL_LIL_ENDIAN 128 * \sa SDL_BIG_ENDIAN 129 */ 130#define SDL_BYTEORDER SDL_LIL_ENDIAN___or_maybe___SDL_BIG_ENDIAN 131#elif defined(SDL_PLATFORM_LINUX) || defined(__GLIBC__) 132#include <endian.h> 133#define SDL_BYTEORDER __BYTE_ORDER 134#elif defined(SDL_PLATFORM_SOLARIS) 135#include <sys/byteorder.h> 136#if defined(_LITTLE_ENDIAN) 137#define SDL_BYTEORDER SDL_LIL_ENDIAN 138#elif defined(_BIG_ENDIAN) 139#define SDL_BYTEORDER SDL_BIG_ENDIAN 140#else 141#error Unsupported endianness 142#endif 143#elif defined(SDL_PLATFORM_OPENBSD) || defined(__DragonFly__) 144#include <endian.h> 145#define SDL_BYTEORDER BYTE_ORDER 146#elif defined(SDL_PLATFORM_FREEBSD) || defined(SDL_PLATFORM_NETBSD) 147#include <sys/endian.h> 148#define SDL_BYTEORDER BYTE_ORDER 149/* predefs from newer gcc and clang versions: */ 150#elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__BYTE_ORDER__) 151#if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) 152#define SDL_BYTEORDER SDL_LIL_ENDIAN 153#elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) 154#define SDL_BYTEORDER SDL_BIG_ENDIAN 155#else 156#error Unsupported endianness 157#endif /**/ 158#else 159#if defined(__hppa__) || \ 160 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ 161 (defined(__MIPS__) && defined(__MIPSEB__)) || \ 162 defined(__ppc__) || defined(__POWERPC__) || defined(__powerpc__) || defined(__PPC__) || \ 163 defined(__sparc__) || defined(__sparc) 164#define SDL_BYTEORDER SDL_BIG_ENDIAN 165#else 166#define SDL_BYTEORDER SDL_LIL_ENDIAN 167#endif 168#endif /* SDL_PLATFORM_LINUX */ 169#endif /* !SDL_BYTEORDER */ 170 171#ifndef SDL_FLOATWORDORDER 172#ifdef SDL_WIKI_DOCUMENTATION_SECTION 173 174/** 175 * A macro that reports the target system's floating point word order. 176 * 177 * This is set to either SDL_LIL_ENDIAN or SDL_BIG_ENDIAN (and maybe other 178 * values in the future, if something else becomes popular). This can be 179 * tested with the preprocessor, so decisions can be made at compile time. 180 * 181 * ```c 182 * #if SDL_FLOATWORDORDER == SDL_BIG_ENDIAN 183 * SDL_Log("This system's floats are bigendian."); 184 * #endif 185 * ``` 186 * 187 * \since This macro is available since SDL 3.2.0. 188 * 189 * \sa SDL_LIL_ENDIAN 190 * \sa SDL_BIG_ENDIAN 191 */ 192#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN___or_maybe___SDL_BIG_ENDIAN 193/* predefs from newer gcc versions: */ 194#elif defined(__ORDER_LITTLE_ENDIAN__) && defined(__ORDER_BIG_ENDIAN__) && defined(__FLOAT_WORD_ORDER__) 195#if (__FLOAT_WORD_ORDER__ == __ORDER_LITTLE_ENDIAN__) 196#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN 197#elif (__FLOAT_WORD_ORDER__ == __ORDER_BIG_ENDIAN__) 198#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN 199#else 200#error Unsupported endianness 201#endif /**/ 202#elif defined(__MAVERICK__) 203/* For Maverick, float words are always little-endian. */ 204#define SDL_FLOATWORDORDER SDL_LIL_ENDIAN 205#elif (defined(__arm__) || defined(__thumb__)) && !defined(__VFP_FP__) && !defined(__ARM_EABI__) 206/* For FPA, float words are always big-endian. */ 207#define SDL_FLOATWORDORDER SDL_BIG_ENDIAN 208#else 209/* By default, assume that floats words follow the memory system mode. */ 210#define SDL_FLOATWORDORDER SDL_BYTEORDER 211#endif /* SDL_WIKI_DOCUMENTATION_SECTION */ 212#endif /* !SDL_FLOATWORDORDER */ 213 214 215#include <SDL3/SDL_begin_code.h> 216/* Set up for C function definitions, even when using C++ */ 217#ifdef __cplusplus 218extern "C" { 219#endif 220 221/* various modern compilers may have builtin swap */ 222#if defined(__GNUC__) || defined(__clang__) 223# define HAS_BUILTIN_BSWAP16 (SDL_HAS_BUILTIN(__builtin_bswap16)) || \ 224 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)) 225# define HAS_BUILTIN_BSWAP32 (SDL_HAS_BUILTIN(__builtin_bswap32)) || \ 226 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) 227# define HAS_BUILTIN_BSWAP64 (SDL_HAS_BUILTIN(__builtin_bswap64)) || \ 228 (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) 229 230 /* this one is broken */ 231# define HAS_BROKEN_BSWAP (__GNUC__ == 2 && __GNUC_MINOR__ <= 95) 232#else 233# define HAS_BUILTIN_BSWAP16 0 234# define HAS_BUILTIN_BSWAP32 0 235# define HAS_BUILTIN_BSWAP64 0 236# define HAS_BROKEN_BSWAP 0 237#endif 238 239/* Byte swap 16-bit integer. */ 240#ifndef SDL_WIKI_DOCUMENTATION_SECTION 241#if HAS_BUILTIN_BSWAP16 242#define SDL_Swap16(x) __builtin_bswap16(x) 243#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL) 244#pragma intrinsic(_byteswap_ushort) 245#define SDL_Swap16(x) _byteswap_ushort(x) 246#elif defined(__i386__) && !HAS_BROKEN_BSWAP 247SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) 248{ 249 __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); 250 return x; 251} 252#elif defined(__x86_64__) 253SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) 254{ 255 __asm__("xchgb %b0,%h0": "=abcd"(x):"0"(x)); 256 return x; 257} 258#elif (defined(__powerpc__) || defined(__ppc__)) 259SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) 260{ 261 int result; 262 263 __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); 264 return (Uint16)result; 265} 266#elif (defined(__m68k__) && !defined(__mcoldfire__)) 267SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) 268{ 269 __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); 270 return x; 271} 272#elif defined(__WATCOMC__) && defined(__386__) 273extern __inline Uint16 SDL_Swap16(Uint16); 274#pragma aux SDL_Swap16 = \ 275 "xchg al, ah" \ 276 parm [ax] \ 277 modify [ax]; 278#else 279SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) 280{ 281 return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); 282} 283#endif 284#endif 285 286/* Byte swap 32-bit integer. */ 287#ifndef SDL_WIKI_DOCUMENTATION_SECTION 288#if HAS_BUILTIN_BSWAP32 289#define SDL_Swap32(x) __builtin_bswap32(x) 290#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL) 291#pragma intrinsic(_byteswap_ulong) 292#define SDL_Swap32(x) _byteswap_ulong(x) 293#elif defined(__i386__) && !HAS_BROKEN_BSWAP 294SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) 295{ 296 __asm__("bswap %0": "=r"(x):"0"(x)); 297 return x; 298} 299#elif defined(__x86_64__) 300SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) 301{ 302 __asm__("bswapl %0": "=r"(x):"0"(x)); 303 return x; 304} 305#elif (defined(__powerpc__) || defined(__ppc__)) 306SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) 307{ 308 Uint32 result; 309 310 __asm__("rlwimi %0,%2,24,16,23": "=&r"(result): "0" (x>>24), "r"(x)); 311 __asm__("rlwimi %0,%2,8,8,15" : "=&r"(result): "0" (result), "r"(x)); 312 __asm__("rlwimi %0,%2,24,0,7" : "=&r"(result): "0" (result), "r"(x)); 313 return result; 314} 315#elif (defined(__m68k__) && !defined(__mcoldfire__)) 316SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) 317{ 318 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); 319 return x; 320} 321#elif defined(__WATCOMC__) && defined(__386__) 322extern __inline Uint32 SDL_Swap32(Uint32); 323#pragma aux SDL_Swap32 = \ 324 "bswap eax" \ 325 parm [eax] \ 326 modify [eax]; 327#else 328SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) 329{ 330 return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | 331 ((x >> 8) & 0x0000FF00) | (x >> 24))); 332} 333#endif 334#endif 335 336/* Byte swap 64-bit integer. */ 337#ifndef SDL_WIKI_DOCUMENTATION_SECTION 338#if HAS_BUILTIN_BSWAP64 339#define SDL_Swap64(x) __builtin_bswap64(x) 340#elif (defined(_MSC_VER) && (_MSC_VER >= 1400)) && !defined(__ICL) 341#pragma intrinsic(_byteswap_uint64) 342#define SDL_Swap64(x) _byteswap_uint64(x) 343#elif defined(__i386__) && !HAS_BROKEN_BSWAP 344SDL_FORCE_INLINE Uint64 SDL_Swap64(Uint64 x) 345{ 346 union { 347 struct { 348 Uint32 a, b; 349 } s; 350 Uint64 u; 351 } v; 352 v.u = x; 353 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 354 : "=r"(v.s.a), "=r"(v.s.b) 355 : "0" (v.s.a), "1"(v.s.b)); 356 return v.u; 357} 358#elif defined(__x86_64__) 359SDL_FORCE_INLINE Uint64 SDL_Swap64(Uint64 x) 360{ 361 __asm__("bswapq %0": "=r"(x):"0"(x)); 362 return x; 363} 364#elif defined(__WATCOMC__) && defined(__386__) 365extern __inline Uint64 SDL_Swap64(Uint64); 366#pragma aux SDL_Swap64 = \ 367 "bswap eax" \ 368 "bswap edx" \ 369 "xchg eax,edx" \ 370 parm [eax edx] \ 371 modify [eax edx]; 372#else 373SDL_FORCE_INLINE Uint64 SDL_Swap64(Uint64 x) 374{ 375 Uint32 hi, lo; 376 377 /* Separate into high and low 32-bit values and swap them */ 378 lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); 379 x >>= 32; 380 hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); 381 x = SDL_Swap32(lo); 382 x <<= 32; 383 x |= SDL_Swap32(hi); 384 return (x); 385} 386#endif 387#endif 388 389/** 390 * Byte-swap a floating point number. 391 * 392 * This will always byte-swap the value, whether it's currently in the native 393 * byteorder of the system or not. You should use SDL_SwapFloatLE or 394 * SDL_SwapFloatBE instead, in most cases. 395 * 396 * Note that this is a forced-inline function in a header, and not a public 397 * API function available in the SDL library (which is to say, the code is 398 * embedded in the calling program and the linker and dynamic loader will not 399 * be able to find this function inside SDL itself). 400 * 401 * \param x the value to byte-swap. 402 * \returns x, with its bytes in the opposite endian order. 403 * 404 * \threadsafety It is safe to call this function from any thread. 405 * 406 * \since This function is available since SDL 3.2.0. 407 */ 408SDL_FORCE_INLINE float SDL_SwapFloat(float x) 409{ 410 union { 411 float f; 412 Uint32 ui32; 413 } swapper; 414 swapper.f = x; 415 swapper.ui32 = SDL_Swap32(swapper.ui32); 416 return swapper.f; 417} 418 419/* remove extra macros */ 420#undef HAS_BROKEN_BSWAP 421#undef HAS_BUILTIN_BSWAP16 422#undef HAS_BUILTIN_BSWAP32 423#undef HAS_BUILTIN_BSWAP64 424 425 426#ifdef SDL_WIKI_DOCUMENTATION_SECTION 427 428/** 429 * Byte-swap an unsigned 16-bit number. 430 * 431 * This will always byte-swap the value, whether it's currently in the native 432 * byteorder of the system or not. You should use SDL_Swap16LE or SDL_Swap16BE 433 * instead, in most cases. 434 * 435 * Note that this is a forced-inline function in a header, and not a public 436 * API function available in the SDL library (which is to say, the code is 437 * embedded in the calling program and the linker and dynamic loader will not 438 * be able to find this function inside SDL itself). 439 * 440 * \param x the value to byte-swap. 441 * \returns `x`, with its bytes in the opposite endian order. 442 * 443 * \threadsafety It is safe to call this function from any thread. 444 * 445 * \since This function is available since SDL 3.2.0. 446 */ 447SDL_FORCE_INLINE Uint16 SDL_Swap16(Uint16 x) { return x_but_byteswapped; } 448 449/** 450 * Byte-swap an unsigned 32-bit number. 451 * 452 * This will always byte-swap the value, whether it's currently in the native 453 * byteorder of the system or not. You should use SDL_Swap32LE or SDL_Swap32BE 454 * instead, in most cases. 455 * 456 * Note that this is a forced-inline function in a header, and not a public 457 * API function available in the SDL library (which is to say, the code is 458 * embedded in the calling program and the linker and dynamic loader will not 459 * be able to find this function inside SDL itself). 460 * 461 * \param x the value to byte-swap. 462 * \returns `x`, with its bytes in the opposite endian order. 463 * 464 * \threadsafety It is safe to call this function from any thread. 465 * 466 * \since This function is available since SDL 3.2.0. 467 */ 468SDL_FORCE_INLINE Uint32 SDL_Swap32(Uint32 x) { return x_but_byteswapped; } 469 470/** 471 * Byte-swap an unsigned 64-bit number. 472 * 473 * This will always byte-swap the value, whether it's currently in the native 474 * byteorder of the system or not. You should use SDL_Swap64LE or SDL_Swap64BE 475 * instead, in most cases. 476 * 477 * Note that this is a forced-inline function in a header, and not a public 478 * API function available in the SDL library (which is to say, the code is 479 * embedded in the calling program and the linker and dynamic loader will not 480 * be able to find this function inside SDL itself). 481 * 482 * \param x the value to byte-swap. 483 * \returns `x`, with its bytes in the opposite endian order. 484 * 485 * \threadsafety It is safe to call this function from any thread. 486 * 487 * \since This function is available since SDL 3.2.0. 488 */ 489SDL_FORCE_INLINE Uint64 SDL_Swap64(Uint64 x) { return x_but_byteswapped; } 490 491/** 492 * Swap a 16-bit value from littleendian to native byte order. 493 * 494 * If this is running on a littleendian system, `x` is returned unchanged. 495 * 496 * This macro never references `x` more than once, avoiding side effects. 497 * 498 * \param x the value to swap, in littleendian byte order. 499 * \returns `x` in native byte order. 500 * 501 * \threadsafety It is safe to call this macro from any thread. 502 * 503 * \since This macro is available since SDL 3.2.0. 504 */ 505#define SDL_Swap16LE(x) SwapOnlyIfNecessary(x) 506 507/** 508 * Swap a 32-bit value from littleendian to native byte order. 509 * 510 * If this is running on a littleendian system, `x` is returned unchanged. 511 * 512 * This macro never references `x` more than once, avoiding side effects. 513 * 514 * \param x the value to swap, in littleendian byte order. 515 * \returns `x` in native byte order. 516 * 517 * \threadsafety It is safe to call this macro from any thread. 518 * 519 * \since This macro is available since SDL 3.2.0. 520 */ 521#define SDL_Swap32LE(x) SwapOnlyIfNecessary(x) 522 523/** 524 * Swap a 64-bit value from littleendian to native byte order. 525 * 526 * If this is running on a littleendian system, `x` is returned unchanged. 527 * 528 * This macro never references `x` more than once, avoiding side effects. 529 * 530 * \param x the value to swap, in littleendian byte order. 531 * \returns `x` in native byte order. 532 * 533 * \threadsafety It is safe to call this macro from any thread. 534 * 535 * \since This macro is available since SDL 3.2.0. 536 */ 537#define SDL_Swap64LE(x) SwapOnlyIfNecessary(x) 538 539/** 540 * Swap a floating point value from littleendian to native byte order. 541 * 542 * If this is running on a littleendian system, `x` is returned unchanged. 543 * 544 * This macro never references `x` more than once, avoiding side effects. 545 * 546 * \param x the value to swap, in littleendian byte order. 547 * \returns `x` in native byte order. 548 * 549 * \threadsafety It is safe to call this macro from any thread. 550 * 551 * \since This macro is available since SDL 3.2.0. 552 */ 553#define SDL_SwapFloatLE(x) SwapOnlyIfNecessary(x) 554 555/** 556 * Swap a 16-bit value from bigendian to native byte order. 557 * 558 * If this is running on a bigendian system, `x` is returned unchanged. 559 * 560 * This macro never references `x` more than once, avoiding side effects. 561 * 562 * \param x the value to swap, in bigendian byte order. 563 * \returns `x` in native byte order. 564 * 565 * \threadsafety It is safe to call this macro from any thread. 566 * 567 * \since This macro is available since SDL 3.2.0. 568 */ 569#define SDL_Swap16BE(x) SwapOnlyIfNecessary(x) 570 571/** 572 * Swap a 32-bit value from bigendian to native byte order. 573 * 574 * If this is running on a bigendian system, `x` is returned unchanged. 575 * 576 * This macro never references `x` more than once, avoiding side effects. 577 * 578 * \param x the value to swap, in bigendian byte order. 579 * \returns `x` in native byte order. 580 * 581 * \threadsafety It is safe to call this macro from any thread. 582 * 583 * \since This macro is available since SDL 3.2.0. 584 */ 585#define SDL_Swap32BE(x) SwapOnlyIfNecessary(x) 586 587/** 588 * Swap a 64-bit value from bigendian to native byte order. 589 * 590 * If this is running on a bigendian system, `x` is returned unchanged. 591 * 592 * This macro never references `x` more than once, avoiding side effects. 593 * 594 * \param x the value to swap, in bigendian byte order. 595 * \returns `x` in native byte order. 596 * 597 * \threadsafety It is safe to call this macro from any thread. 598 * 599 * \since This macro is available since SDL 3.2.0. 600 */ 601#define SDL_Swap64BE(x) SwapOnlyIfNecessary(x) 602 603/** 604 * Swap a floating point value from bigendian to native byte order. 605 * 606 * If this is running on a bigendian system, `x` is returned unchanged. 607 * 608 * This macro never references `x` more than once, avoiding side effects. 609 * 610 * \param x the value to swap, in bigendian byte order. 611 * \returns `x` in native byte order. 612 * 613 * \threadsafety It is safe to call this macro from any thread. 614 * 615 * \since This macro is available since SDL 3.2.0. 616 */ 617#define SDL_SwapFloatBE(x) SwapOnlyIfNecessary(x) 618 619#elif SDL_BYTEORDER == SDL_LIL_ENDIAN 620#define SDL_Swap16LE(x) (x) 621#define SDL_Swap32LE(x) (x) 622#define SDL_Swap64LE(x) (x) 623#define SDL_SwapFloatLE(x) (x) 624#define SDL_Swap16BE(x) SDL_Swap16(x) 625#define SDL_Swap32BE(x) SDL_Swap32(x) 626#define SDL_Swap64BE(x) SDL_Swap64(x) 627#define SDL_SwapFloatBE(x) SDL_SwapFloat(x) 628#else 629#define SDL_Swap16LE(x) SDL_Swap16(x) 630#define SDL_Swap32LE(x) SDL_Swap32(x) 631#define SDL_Swap64LE(x) SDL_Swap64(x) 632#define SDL_SwapFloatLE(x) SDL_SwapFloat(x) 633#define SDL_Swap16BE(x) (x) 634#define SDL_Swap32BE(x) (x) 635#define SDL_Swap64BE(x) (x) 636#define SDL_SwapFloatBE(x) (x) 637#endif 638 639/* Ends C function definitions when using C++ */ 640#ifdef __cplusplus 641} 642#endif 643#include <SDL3/SDL_close_code.h> 644 645#endif /* SDL_endian_h_ */ 646[FILE END](C) 2025 0x4248 (C) 2025 4248 Media and 4248 Systems, All part of 0x4248 See LICENCE files for more information. 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