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annotate include/SDL_version.h @ 3491:1192adfc6d52

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Add error messages for failure cases
author Sam Lantinga <slouken@libsdl.org>
date Wed, 25 Nov 2009 06:00:00 +0000
parents d3baf5ac4e37
children f7b03b6838cb
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * \file SDL_version.h
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25 *
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26 * This header defines the current SDL version.
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27 */
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28
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29 #ifndef _SDL_version_h
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30 #define _SDL_version_h
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_revision.h"
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34
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35 #include "begin_code.h"
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36 /* Set up for C function definitions, even when using C++ */
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37 #ifdef __cplusplus
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38 /* *INDENT-OFF* */
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39 extern "C" {
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40 /* *INDENT-ON* */
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41 #endif
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42
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43 /**
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44 * \brief Information the version of SDL in use.
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45 *
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46 * Represents the library's version as three levels: major revision
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47 * (increments with massive changes, additions, and enhancements),
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48 * minor revision (increments with backwards-compatible changes to the
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49 * major revision), and patchlevel (increments with fixes to the minor
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50 * revision).
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51 *
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52 * \sa SDL_VERSION
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53 * \sa SDL_GetVersion
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54 */
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55 typedef struct SDL_version
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56 {
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57 Uint8 major; /**< major version */
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58 Uint8 minor; /**< minor version */
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59 Uint8 patch; /**< update version */
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60 } SDL_version;
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61
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62 /* Printable format: "%d.%d.%d", MAJOR, MINOR, PATCHLEVEL
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63 */
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64 #define SDL_MAJOR_VERSION 1
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65 #define SDL_MINOR_VERSION 3
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66 #define SDL_PATCHLEVEL 0
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67
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68 /**
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69 * \brief Macro to determine SDL version program was compiled against.
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70 *
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71 * This macro fills in a SDL_version structure with the version of the
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72 * library you compiled against. This is determined by what header the
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73 * compiler uses. Note that if you dynamically linked the library, you might
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74 * have a slightly newer or older version at runtime. That version can be
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75 * determined with SDL_GetVersion(), which, unlike SDL_VERSION(),
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76 * is not a macro.
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77 *
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78 * \param x A pointer to a SDL_version struct to initialize.
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79 *
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80 * \sa SDL_version
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81 * \sa SDL_GetVersion
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82 */
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83 #define SDL_VERSION(x) \
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84 { \
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85 (x)->major = SDL_MAJOR_VERSION; \
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86 (x)->minor = SDL_MINOR_VERSION; \
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87 (x)->patch = SDL_PATCHLEVEL; \
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88 }
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89
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90 /**
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91 * This macro turns the version numbers into a numeric value:
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92 * \verbatim
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93 (1,2,3) -> (1203)
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94 \endverbatim
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95 *
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96 * This assumes that there will never be more than 100 patchlevels.
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97 */
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98 #define SDL_VERSIONNUM(X, Y, Z) \
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99 ((X)*1000 + (Y)*100 + (Z))
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100
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101 /**
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102 * This is the version number macro for the current SDL version.
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103 */
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104 #define SDL_COMPILEDVERSION \
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105 SDL_VERSIONNUM(SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_PATCHLEVEL)
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106
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107 /**
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108 * This macro will evaluate to true if compiled with SDL at least X.Y.Z.
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109 */
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110 #define SDL_VERSION_ATLEAST(X, Y, Z) \
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111 (SDL_COMPILEDVERSION >= SDL_VERSIONNUM(X, Y, Z))
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112
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113 /**
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114 * \brief Get the version of SDL that is linked against your program.
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115 *
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116 * If you are using a shared library (DLL) version of SDL, then it is
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117 * possible that it will be different than the version you compiled against.
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118 *
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119 * This is a real function; the macro SDL_VERSION() tells you what version
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120 * of SDL you compiled against:
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121 *
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122 * \code
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123 * SDL_version compiled;
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124 * SDL_version linked;
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125 *
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126 * SDL_VERSION(&compiled);
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127 * SDL_GetVersion(&linked);
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128 * printf("We compiled against SDL version %d.%d.%d ...\n",
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129 * compiled.major, compiled.minor, compiled.patch);
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130 * printf("But we linked against SDL version %d.%d.%d.\n",
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131 * linked.major, linked.minor, linked.patch);
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132 * \endcode
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133 *
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134 * This function may be called safely at any time, even before SDL_Init().
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135 *
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136 * \sa SDL_VERSION
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137 */
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138 extern DECLSPEC void SDLCALL SDL_GetVersion(SDL_version * ver);
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139
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140 /**
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141 * \brief Get the code revision of SDL that is linked against your program.
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142 */
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143 extern DECLSPEC int SDLCALL SDL_GetRevision(void);
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144
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145 /* Ends C function definitions when using C++ */
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146 #ifdef __cplusplus
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147 /* *INDENT-OFF* */
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148 }
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149 /* *INDENT-ON* */
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150 #endif
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151 #include "close_code.h"
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152
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153 #endif /* _SDL_version_h */
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154
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155 /* vi: set ts=4 sw=4 expandtab: */