sdl-ios-xcode: include/SDL_endian.h annotate

annotate include/SDL_endian.h @ 4001:6831b8723a85 SDL-1.2

Don't initialize the audio buffer passed to the application's audio callback, since they are expected to entirely fill it with data or silence. For legacy apps that might expect the buffer to already have silence and thus may not fill the buffer in the callback, there's an environment variable to expose the old behaviour. Fixes Bugzilla #416.

author	Ryan C. Gordon <icculus@icculus.org>
date	Thu, 05 Jul 2007 02:24:36 +0000
parents	6832b00d3594
children	a1b03ba2fcd0

rev	line source
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	1 /*
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	2 SDL - Simple DirectMedia Layer
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	3 Copyright (C) 1997-2006 Sam Lantinga
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	4
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	5 This library is free software; you can redistribute it and/or
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	6 modify it under the terms of the GNU Lesser General Public
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	7 License as published by the Free Software Foundation; either
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	8 version 2.1 of the License, or (at your option) any later version.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	9
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	10 This library is distributed in the hope that it will be useful,
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	13 Lesser General Public License for more details.
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	14
1312 c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	15 You should have received a copy of the GNU Lesser General Public
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	16 License along with this library; if not, write to the Free Software
c9b51268668f Updated copyright information and removed rcs id lines (problematic in branch merges) Sam Lantinga <slouken@libsdl.org> parents: 1044 diff changeset	17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	18
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	19 Sam Lantinga
251 b8688cfdc232 Updated the headers with the correct e-mail address Sam Lantinga <slouken@libsdl.org> parents: 0 diff changeset	20 slouken@libsdl.org
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	21 */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	22
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	23 /* Functions for reading and writing endian-specific values */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	24
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	25 #ifndef _SDL_endian_h
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	26 #define _SDL_endian_h
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	27
1354 22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	28 #include "SDL_stdinc.h"
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	29
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	30 /* The two types of endianness */
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	31 #define SDL_LIL_ENDIAN 1234
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	32 #define SDL_BIG_ENDIAN 4321
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	33
1354 22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	34 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
1474 351d757c7edd Maybe it's easier to collect the big-endian architectures. :) Sam Lantinga <slouken@libsdl.org> parents: 1469 diff changeset	35 #if defined(__hppa__) \|\| \
1475 d45aefcac017 Get Microsoft's preprocessor symbols in there Sam Lantinga <slouken@libsdl.org> parents: 1474 diff changeset	36 defined(__m68k__) \|\| defined(mc68000) \|\| defined(_M_M68K) \|\| \
1474 351d757c7edd Maybe it's easier to collect the big-endian architectures. :) Sam Lantinga <slouken@libsdl.org> parents: 1469 diff changeset	37 (defined(__MIPS__) && defined(__MISPEB__)) \|\| \
1475 d45aefcac017 Get Microsoft's preprocessor symbols in there Sam Lantinga <slouken@libsdl.org> parents: 1474 diff changeset	38 defined(__ppc__) \|\| defined(__POWERPC__) \|\| defined(_M_PPC) \|\| \
1474 351d757c7edd Maybe it's easier to collect the big-endian architectures. :) Sam Lantinga <slouken@libsdl.org> parents: 1469 diff changeset	39 defined(__sparc__)
351d757c7edd Maybe it's easier to collect the big-endian architectures. :) Sam Lantinga <slouken@libsdl.org> parents: 1469 diff changeset	40 #define SDL_BYTEORDER SDL_BIG_ENDIAN
351d757c7edd Maybe it's easier to collect the big-endian architectures. :) Sam Lantinga <slouken@libsdl.org> parents: 1469 diff changeset	41 #else
1354 22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	42 #define SDL_BYTEORDER SDL_LIL_ENDIAN
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	43 #endif
22f39393668a Fixed build problem with SDL_string.c Sam Lantinga <slouken@libsdl.org> parents: 1353 diff changeset	44 #endif /* !SDL_BYTEORDER */
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	45
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	46
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	47 #include "begin_code.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	48 /* Set up for C function definitions, even when using C++ */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	49 #ifdef __cplusplus
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	50 extern "C" {
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	51 #endif
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	52
1369 42eeb14770e3 Doh! Bitten by search and replace. :) Sam Lantinga <slouken@libsdl.org> parents: 1368 diff changeset	53 /* Use inline functions for compilers that support them, and static
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	54 functions for those that do not. Because these functions become
1369 42eeb14770e3 Doh! Bitten by search and replace. :) Sam Lantinga <slouken@libsdl.org> parents: 1368 diff changeset	55 static for compilers that do not support inline functions, this
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	56 header should only be included in files that actually use them.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	57 */
1372 3e171fa5f4df Whoops Sam Lantinga <slouken@libsdl.org> parents: 1369 diff changeset	58 #if defined(__GNUC__) && defined(__i386__) && \
3909 6832b00d3594 Patched to compile on BeOS and old, old GCC releases. Ryan C. Gordon <icculus@icculus.org> parents: 1475 diff changeset	59 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	60 static __inline__ Uint16 SDL_Swap16(Uint16 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	61 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	62 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	63 return x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	64 }
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	65 #elif defined(__GNUC__) && defined(__x86_64__)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	66 static __inline__ Uint16 SDL_Swap16(Uint16 x)
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	67 {
1033 aebfa3ce2a53 The fix is going back in. :) Sam Lantinga <slouken@libsdl.org> parents: 1031 diff changeset	68 __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	69 return x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	70 }
859 6b28c91bf3d2 This works on MacOS X too. :) Sam Lantinga <slouken@libsdl.org> parents: 849 diff changeset	71 #elif defined(__GNUC__) && (defined(__powerpc__) \|\| defined(__ppc__))
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	72 static __inline__ Uint16 SDL_Swap16(Uint16 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	73 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	74 Uint16 result;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	75
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	76 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	77 return result;
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	78 }
1044 d36ea7925763 Optimize also for 68020 and higher CPUs Patrice Mandin <patmandin@gmail.com> parents: 1033 diff changeset	79 #elif defined(__GNUC__) && (defined(__M68000__) \|\| defined(__M68020__))
985 cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	80 static __inline__ Uint16 SDL_Swap16(Uint16 x)
cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	81 {
cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	82 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	83 return x;
cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	84 }
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	85 #else
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	86 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	87 return((x<<8)\|(x>>8));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	88 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	89 #endif
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	90
3909 6832b00d3594 Patched to compile on BeOS and old, old GCC releases. Ryan C. Gordon <icculus@icculus.org> parents: 1475 diff changeset	91 #if defined(__GNUC__) && defined(__i386__) && \
6832b00d3594 Patched to compile on BeOS and old, old GCC releases. Ryan C. Gordon <icculus@icculus.org> parents: 1475 diff changeset	92 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	93 static __inline__ Uint32 SDL_Swap32(Uint32 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	94 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	95 __asm__("bswap %0" : "=r" (x) : "0" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	96 return x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	97 }
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	98 #elif defined(__GNUC__) && defined(__x86_64__)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	99 static __inline__ Uint32 SDL_Swap32(Uint32 x)
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	100 {
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	101 __asm__("bswapl %0" : "=r" (x) : "0" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	102 return x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	103 }
859 6b28c91bf3d2 This works on MacOS X too. :) Sam Lantinga <slouken@libsdl.org> parents: 849 diff changeset	104 #elif defined(__GNUC__) && (defined(__powerpc__) \|\| defined(__ppc__))
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	105 static __inline__ Uint32 SDL_Swap32(Uint32 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	106 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	107 Uint32 result;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	108
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	109 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	110 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	111 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	112 return result;
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	113 }
1044 d36ea7925763 Optimize also for 68020 and higher CPUs Patrice Mandin <patmandin@gmail.com> parents: 1033 diff changeset	114 #elif defined(__GNUC__) && (defined(__M68000__) \|\| defined(__M68020__))
994 c4e5473672b6 Wrong size of parameters for SDL_Swap32 m68k assembly routine Patrice Mandin <patmandin@gmail.com> parents: 985 diff changeset	115 static __inline__ Uint32 SDL_Swap32(Uint32 x)
985 cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	116 {
1044 d36ea7925763 Optimize also for 68020 and higher CPUs Patrice Mandin <patmandin@gmail.com> parents: 1033 diff changeset	117 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
985 cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	118 return x;
cec525374267 Add m68k assembly routines for endianness conversion Patrice Mandin <patmandin@gmail.com> parents: 859 diff changeset	119 }
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	120 #else
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	121 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	122 return((x<<24)\|((x<<8)&0x00FF0000)\|((x>>8)&0x0000FF00)\|(x>>24));
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	123 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	124 #endif
848 85af65457959 Avoid using kernel internal headers Sam Lantinga <slouken@libsdl.org> parents: 769 diff changeset	125
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	126 #ifdef SDL_HAS_64BIT_TYPE
3909 6832b00d3594 Patched to compile on BeOS and old, old GCC releases. Ryan C. Gordon <icculus@icculus.org> parents: 1475 diff changeset	127 #if defined(__GNUC__) && defined(__i386__) && \
6832b00d3594 Patched to compile on BeOS and old, old GCC releases. Ryan C. Gordon <icculus@icculus.org> parents: 1475 diff changeset	128 !(__GNUC__ == 2 && __GNUC_MINOR__ <= 95 /* broken gcc version */)
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	129 static __inline__ Uint64 SDL_Swap64(Uint64 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	130 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	131 union {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	132 struct { Uint32 a,b; } s;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	133 Uint64 u;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	134 } v;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	135 v.u = x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	136 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	137 : "=r" (v.s.a), "=r" (v.s.b)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	138 : "0" (v.s.a), "1" (v.s.b));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	139 return v.u;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	140 }
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	141 #elif defined(__GNUC__) && defined(__x86_64__)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	142 static __inline__ Uint64 SDL_Swap64(Uint64 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	143 {
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	144 __asm__("bswapq %0" : "=r" (x) : "0" (x));
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	145 return x;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	146 }
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	147 #else
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	148 static __inline__ Uint64 SDL_Swap64(Uint64 x)
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	149 {
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	150 Uint32 hi, lo;
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	151
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	152 /* Separate into high and low 32-bit values and swap them */
849 bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	153 lo = (Uint32)(x&0xFFFFFFFF);
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	154 x >>= 32;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	155 hi = (Uint32)(x&0xFFFFFFFF);
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	156 x = SDL_Swap32(lo);
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	157 x <<= 32;
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	158 x \|= SDL_Swap32(hi);
bab227101de4 Added inline byte swapping code for other architectures Sam Lantinga <slouken@libsdl.org> parents: 848 diff changeset	159 return(x);
0 74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	160 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	161 #endif
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	162 #else
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	163 /* This is mainly to keep compilers from complaining in SDL code.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	164 If there is no real 64-bit datatype, then compilers will complain about
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	165 the fake 64-bit datatype that SDL provides when it compiles user code.
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	166 */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	167 #define SDL_Swap64(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	168 #endif /* SDL_HAS_64BIT_TYPE */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	169
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	170
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	171 /* Byteswap item from the specified endianness to the native endianness */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	172 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	173 #define SDL_SwapLE16(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	174 #define SDL_SwapLE32(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	175 #define SDL_SwapLE64(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	176 #define SDL_SwapBE16(X) SDL_Swap16(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	177 #define SDL_SwapBE32(X) SDL_Swap32(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	178 #define SDL_SwapBE64(X) SDL_Swap64(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	179 #else
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	180 #define SDL_SwapLE16(X) SDL_Swap16(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	181 #define SDL_SwapLE32(X) SDL_Swap32(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	182 #define SDL_SwapLE64(X) SDL_Swap64(X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	183 #define SDL_SwapBE16(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	184 #define SDL_SwapBE32(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	185 #define SDL_SwapBE64(X) (X)
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	186 #endif
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	187
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	188 /* Ends C function definitions when using C++ */
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	189 #ifdef __cplusplus
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	190 }
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	191 #endif
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	192 #include "close_code.h"
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	193
74212992fb08 Initial revision Sam Lantinga <slouken@lokigames.com> parents: diff changeset	194 #endif /* _SDL_endian_h */

Mercurial > sdl-ios-xcode

annotate include/SDL_endian.h @ 4001:6831b8723a85 SDL-1.2