Mercurial > sdl-ios-xcode
annotate include/SDL_endian.h @ 1282:217f5d5a49e5
Date: Sat, 15 Jan 2005 02:01:51 +0000 (UTC)
From: jimrandomh
Subject: [SDL] Re: Modifier keys pressed during initialization stick
I wrote a simple test program which initializes SDL, prints the SDL
version number, then prints any keydown and keyup events with their
modifiers. (Source code below). Compilation was done using Visual
Studio 6, release mode.
My test sequence was:
Start a command prompt. Type the name of the test program.
shift down
enter down (program starts)
Wait for window to appear
enter up
shift up
spacebar down
spacebar up
Under Windows 98, the output was correct:
SDL 1.2.8
left shift down
shift-return down
shift-return up
left shift up
space down
space up
Under Windows 2000 and under Windows XP, the output was:
SDL 1.2.8
shift-space down
shift-space up
Since shift was not held at the time space was pressed, this is
incorrect. Similar results were observed with launching in different
ways (including double-clicking in Windows Explorer), so it does not
depend on the launching terminal.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 29 Jan 2006 07:57:13 +0000 |
parents | d36ea7925763 |
children | c9b51268668f |
rev | line source |
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0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2004 Sam Lantinga |
0 | 4 |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Library General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2 of the License, or (at your option) any later version. | |
9 | |
10 This library is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 Library General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Library General Public | |
16 License along with this library; if not, write to the Free | |
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | |
19 Sam Lantinga | |
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20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
26 #endif | |
27 | |
28 /* Functions for reading and writing endian-specific values */ | |
29 | |
30 #ifndef _SDL_endian_h | |
31 #define _SDL_endian_h | |
32 | |
33 /* These functions read and write data of the specified endianness, | |
34 dynamically translating to the host machine endianness. | |
35 | |
36 e.g.: If you want to read a 16 bit value on big-endian machine from | |
37 an open file containing little endian values, you would use: | |
38 value = SDL_ReadLE16(rp); | |
39 Note that the read/write functions use SDL_RWops pointers | |
40 instead of FILE pointers. This allows you to read and write | |
41 endian values from large chunks of memory as well as files | |
42 and other data sources. | |
43 */ | |
44 | |
45 #include <stdio.h> | |
46 | |
47 #include "SDL_types.h" | |
48 #include "SDL_rwops.h" | |
49 #include "SDL_byteorder.h" | |
50 | |
51 #include "begin_code.h" | |
52 /* Set up for C function definitions, even when using C++ */ | |
53 #ifdef __cplusplus | |
54 extern "C" { | |
55 #endif | |
56 | |
57 /* Use inline functions for compilers that support them, and static | |
58 functions for those that do not. Because these functions become | |
59 static for compilers that do not support inline functions, this | |
60 header should only be included in files that actually use them. | |
61 */ | |
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62 #if defined(__GNUC__) && defined(__i386__) |
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63 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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64 { |
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65 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x)); |
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66 return x; |
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67 } |
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68 #elif defined(__GNUC__) && defined(__x86_64__) |
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69 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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70 { |
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71 __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x)); |
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72 return x; |
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73 } |
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74 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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75 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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76 { |
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77 Uint16 result; |
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78 |
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79 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x)); |
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80 return result; |
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81 } |
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82 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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83 static __inline__ Uint16 SDL_Swap16(Uint16 x) |
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84 { |
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85 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc"); |
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86 return x; |
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87 } |
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88 #else |
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89 static __inline__ Uint16 SDL_Swap16(Uint16 x) { |
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90 return((x<<8)|(x>>8)); |
0 | 91 } |
92 #endif | |
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93 |
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94 #if defined(__GNUC__) && defined(__i386__) |
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95 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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96 { |
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97 __asm__("bswap %0" : "=r" (x) : "0" (x)); |
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98 return x; |
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99 } |
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100 #elif defined(__GNUC__) && defined(__x86_64__) |
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101 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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102 { |
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103 __asm__("bswapl %0" : "=r" (x) : "0" (x)); |
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104 return x; |
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105 } |
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106 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__)) |
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107 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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108 { |
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109 Uint32 result; |
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110 |
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111 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x)); |
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112 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x)); |
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113 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x)); |
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114 return result; |
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115 } |
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116 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__)) |
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117 static __inline__ Uint32 SDL_Swap32(Uint32 x) |
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118 { |
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119 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc"); |
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120 return x; |
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121 } |
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122 #else |
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123 static __inline__ Uint32 SDL_Swap32(Uint32 x) { |
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124 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24)); |
0 | 125 } |
126 #endif | |
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127 |
0 | 128 #ifdef SDL_HAS_64BIT_TYPE |
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129 #if defined(__GNUC__) && defined(__i386__) |
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130 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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131 { |
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132 union { |
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133 struct { Uint32 a,b; } s; |
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134 Uint64 u; |
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135 } v; |
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136 v.u = x; |
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137 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1" |
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138 : "=r" (v.s.a), "=r" (v.s.b) |
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139 : "0" (v.s.a), "1" (v.s.b)); |
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140 return v.u; |
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141 } |
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142 #elif defined(__GNUC__) && defined(__x86_64__) |
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143 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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144 { |
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145 __asm__("bswapq %0" : "=r" (x) : "0" (x)); |
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146 return x; |
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147 } |
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148 #else |
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149 static __inline__ Uint64 SDL_Swap64(Uint64 x) |
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150 { |
0 | 151 Uint32 hi, lo; |
152 | |
153 /* Separate into high and low 32-bit values and swap them */ | |
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154 lo = (Uint32)(x&0xFFFFFFFF); |
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155 x >>= 32; |
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156 hi = (Uint32)(x&0xFFFFFFFF); |
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157 x = SDL_Swap32(lo); |
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158 x <<= 32; |
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159 x |= SDL_Swap32(hi); |
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160 return(x); |
0 | 161 } |
162 #endif | |
163 #else | |
164 /* This is mainly to keep compilers from complaining in SDL code. | |
165 If there is no real 64-bit datatype, then compilers will complain about | |
166 the fake 64-bit datatype that SDL provides when it compiles user code. | |
167 */ | |
168 #define SDL_Swap64(X) (X) | |
169 #endif /* SDL_HAS_64BIT_TYPE */ | |
170 | |
171 | |
172 /* Byteswap item from the specified endianness to the native endianness */ | |
173 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
174 #define SDL_SwapLE16(X) (X) | |
175 #define SDL_SwapLE32(X) (X) | |
176 #define SDL_SwapLE64(X) (X) | |
177 #define SDL_SwapBE16(X) SDL_Swap16(X) | |
178 #define SDL_SwapBE32(X) SDL_Swap32(X) | |
179 #define SDL_SwapBE64(X) SDL_Swap64(X) | |
180 #else | |
181 #define SDL_SwapLE16(X) SDL_Swap16(X) | |
182 #define SDL_SwapLE32(X) SDL_Swap32(X) | |
183 #define SDL_SwapLE64(X) SDL_Swap64(X) | |
184 #define SDL_SwapBE16(X) (X) | |
185 #define SDL_SwapBE32(X) (X) | |
186 #define SDL_SwapBE64(X) (X) | |
187 #endif | |
188 | |
189 /* Read an item of the specified endianness and return in native format */ | |
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190 extern DECLSPEC Uint16 SDLCALL SDL_ReadLE16(SDL_RWops *src); |
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191 extern DECLSPEC Uint16 SDLCALL SDL_ReadBE16(SDL_RWops *src); |
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192 extern DECLSPEC Uint32 SDLCALL SDL_ReadLE32(SDL_RWops *src); |
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193 extern DECLSPEC Uint32 SDLCALL SDL_ReadBE32(SDL_RWops *src); |
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194 extern DECLSPEC Uint64 SDLCALL SDL_ReadLE64(SDL_RWops *src); |
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195 extern DECLSPEC Uint64 SDLCALL SDL_ReadBE64(SDL_RWops *src); |
0 | 196 |
197 /* Write an item of native format to the specified endianness */ | |
337
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Explicitly specify the SDL API calling convention (C by default)
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198 extern DECLSPEC int SDLCALL SDL_WriteLE16(SDL_RWops *dst, Uint16 value); |
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Explicitly specify the SDL API calling convention (C by default)
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199 extern DECLSPEC int SDLCALL SDL_WriteBE16(SDL_RWops *dst, Uint16 value); |
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Explicitly specify the SDL API calling convention (C by default)
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200 extern DECLSPEC int SDLCALL SDL_WriteLE32(SDL_RWops *dst, Uint32 value); |
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Explicitly specify the SDL API calling convention (C by default)
Sam Lantinga <slouken@libsdl.org>
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201 extern DECLSPEC int SDLCALL SDL_WriteBE32(SDL_RWops *dst, Uint32 value); |
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Explicitly specify the SDL API calling convention (C by default)
Sam Lantinga <slouken@libsdl.org>
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202 extern DECLSPEC int SDLCALL SDL_WriteLE64(SDL_RWops *dst, Uint64 value); |
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Explicitly specify the SDL API calling convention (C by default)
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203 extern DECLSPEC int SDLCALL SDL_WriteBE64(SDL_RWops *dst, Uint64 value); |
0 | 204 |
205 | |
206 /* Ends C function definitions when using C++ */ | |
207 #ifdef __cplusplus | |
208 } | |
209 #endif | |
210 #include "close_code.h" | |
211 | |
212 #endif /* _SDL_endian_h */ |