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Diffstat (limited to 'vendor/SDL/include/SDL_endian.h')
| -rw-r--r-- | vendor/SDL/include/SDL_endian.h | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/vendor/SDL/include/SDL_endian.h b/vendor/SDL/include/SDL_endian.h new file mode 100644 index 0000000..3eda7f2 --- /dev/null +++ b/vendor/SDL/include/SDL_endian.h @@ -0,0 +1,260 @@ +/* + Simple DirectMedia Layer + Copyright (C) 1997-2017 Sam Lantinga <[email protected]> + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +/** + * \file SDL_endian.h + * + * Functions for reading and writing endian-specific values + */ + +#ifndef SDL_endian_h_ +#define SDL_endian_h_ + +#include "SDL_stdinc.h" + +/** + * \name The two types of endianness + */ +/* @{ */ +#define SDL_LIL_ENDIAN 1234 +#define SDL_BIG_ENDIAN 4321 +/* @} */ + +#ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */ +#ifdef __linux__ +#include <endian.h> +#define SDL_BYTEORDER __BYTE_ORDER +#else /* __linux__ */ +#if defined(__hppa__) || \ + defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \ + (defined(__MIPS__) && defined(__MISPEB__)) || \ + defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \ + defined(__sparc__) +#define SDL_BYTEORDER SDL_BIG_ENDIAN +#else +#define SDL_BYTEORDER SDL_LIL_ENDIAN +#endif +#endif /* __linux__ */ +#endif /* !SDL_BYTEORDER */ + + +#include "begin_code.h" +/* Set up for C function definitions, even when using C++ */ +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \file SDL_endian.h + */ +#if defined(__GNUC__) && defined(__i386__) && \ + !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("xchgb %b0,%h0": "=q"(x):"0"(x)); + return x; +} +#elif defined(__GNUC__) && defined(__x86_64__) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("xchgb %b0,%h0": "=Q"(x):"0"(x)); + return x; +} +#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + int result; + + __asm__("rlwimi %0,%2,8,16,23": "=&r"(result):"0"(x >> 8), "r"(x)); + return (Uint16)result; +} +#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + __asm__("rorw #8,%0": "=d"(x): "0"(x):"cc"); + return x; +} +#elif defined(__WATCOMC__) && defined(__386__) +extern _inline Uint16 SDL_Swap16(Uint16); +#pragma aux SDL_Swap16 = \ + "xchg al, ah" \ + parm [ax] \ + modify [ax]; +#else +SDL_FORCE_INLINE Uint16 +SDL_Swap16(Uint16 x) +{ + return SDL_static_cast(Uint16, ((x << 8) | (x >> 8))); +} +#endif + +#if defined(__GNUC__) && defined(__i386__) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("bswap %0": "=r"(x):"0"(x)); + return x; +} +#elif defined(__GNUC__) && defined(__x86_64__) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("bswapl %0": "=r"(x):"0"(x)); + return x; +} +#elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + Uint32 result; + + __asm__("rlwimi %0,%2,24,16,23": "=&r"(result):"0"(x >> 24), "r"(x)); + __asm__("rlwimi %0,%2,8,8,15": "=&r"(result):"0"(result), "r"(x)); + __asm__("rlwimi %0,%2,24,0,7": "=&r"(result):"0"(result), "r"(x)); + return result; +} +#elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) && !defined(__mcoldfire__) +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0": "=d"(x): "0"(x):"cc"); + return x; +} +#elif defined(__WATCOMC__) && defined(__386__) +extern _inline Uint32 SDL_Swap32(Uint32); +#ifndef __SW_3 /* 486+ */ +#pragma aux SDL_Swap32 = \ + "bswap eax" \ + parm [eax] \ + modify [eax]; +#else /* 386-only */ +#pragma aux SDL_Swap32 = \ + "xchg al, ah" \ + "ror eax, 16" \ + "xchg al, ah" \ + parm [eax] \ + modify [eax]; +#endif +#else +SDL_FORCE_INLINE Uint32 +SDL_Swap32(Uint32 x) +{ + return SDL_static_cast(Uint32, ((x << 24) | ((x << 8) & 0x00FF0000) | + ((x >> 8) & 0x0000FF00) | (x >> 24))); +} +#endif + +#if defined(__GNUC__) && defined(__i386__) +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + union + { + struct + { + Uint32 a, b; + } s; + Uint64 u; + } v; + v.u = x; + __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1": "=r"(v.s.a), "=r"(v.s.b):"0"(v.s.a), + "1"(v.s. + b)); + return v.u; +} +#elif defined(__GNUC__) && defined(__x86_64__) +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + __asm__("bswapq %0": "=r"(x):"0"(x)); + return x; +} +#else +SDL_FORCE_INLINE Uint64 +SDL_Swap64(Uint64 x) +{ + Uint32 hi, lo; + + /* Separate into high and low 32-bit values and swap them */ + lo = SDL_static_cast(Uint32, x & 0xFFFFFFFF); + x >>= 32; + hi = SDL_static_cast(Uint32, x & 0xFFFFFFFF); + x = SDL_Swap32(lo); + x <<= 32; + x |= SDL_Swap32(hi); + return (x); +} +#endif + + +SDL_FORCE_INLINE float +SDL_SwapFloat(float x) +{ + union + { + float f; + Uint32 ui32; + } swapper; + swapper.f = x; + swapper.ui32 = SDL_Swap32(swapper.ui32); + return swapper.f; +} + + +/** + * \name Swap to native + * Byteswap item from the specified endianness to the native endianness. + */ +/* @{ */ +#if SDL_BYTEORDER == SDL_LIL_ENDIAN +#define SDL_SwapLE16(X) (X) +#define SDL_SwapLE32(X) (X) +#define SDL_SwapLE64(X) (X) +#define SDL_SwapFloatLE(X) (X) +#define SDL_SwapBE16(X) SDL_Swap16(X) +#define SDL_SwapBE32(X) SDL_Swap32(X) +#define SDL_SwapBE64(X) SDL_Swap64(X) +#define SDL_SwapFloatBE(X) SDL_SwapFloat(X) +#else +#define SDL_SwapLE16(X) SDL_Swap16(X) +#define SDL_SwapLE32(X) SDL_Swap32(X) +#define SDL_SwapLE64(X) SDL_Swap64(X) +#define SDL_SwapFloatLE(X) SDL_SwapFloat(X) +#define SDL_SwapBE16(X) (X) +#define SDL_SwapBE32(X) (X) +#define SDL_SwapBE64(X) (X) +#define SDL_SwapFloatBE(X) (X) +#endif +/* @} *//* Swap to native */ + +/* Ends C function definitions when using C++ */ +#ifdef __cplusplus +} +#endif +#include "close_code.h" + +#endif /* SDL_endian_h_ */ + +/* vi: set ts=4 sw=4 expandtab: */ |