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annotate src/video/x11/SDL_x11dyn.c @ 1575:3ba88cb7eb1b

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Updated dynamic X11 code. See details in Bugzilla #170.
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 22 Mar 2006 05:00:59 +0000
parents d910939febfa
children 7fd9fc1f2be5
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #include "SDL_config.h"
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23
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24 #if 1
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25 #define DEBUG_DYNAMIC_X11 1
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26 #endif
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27
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28 #include "SDL_x11dyn.h"
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29
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30 #ifdef DEBUG_DYNAMIC_X11
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31 #include <stdio.h>
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32 #endif
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33
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34 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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35 #include <dlfcn.h>
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36 #include "SDL_name.h"
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37 #include "SDL_loadso.h"
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38 static const char *x11_library = SDL_VIDEO_DRIVER_X11_DYNAMIC;
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39 static void *x11_handle = NULL;
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40 static const char *x11ext_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT;
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41 static void *x11ext_handle = NULL;
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42
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43 typedef struct
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44 {
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45 void *lib;
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46 const char *libname;
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47 } x11libitem;
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48
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49 static void *X11_GetSym(const char *fnname, int *rc)
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50 {
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51 int i;
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52 void *fn = NULL;
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53 const x11libitem libs[] =
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54 {
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55 { x11_handle, "libX11" },
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56 { x11ext_handle, "libX11ext" },
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57 };
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58
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59 for (i = 0; i < (sizeof (libs) / sizeof (libs[0])); i++)
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60 {
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61 if (libs[i].lib != NULL)
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62 {
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63 fn = SDL_LoadFunction(libs[i].lib, fnname);
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64 if (fn != NULL)
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65 break;
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66 }
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67 }
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68
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69 #if DEBUG_DYNAMIC_X11
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70 if (fn != NULL)
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71 printf("X11: Found '%s' in %s (%p)\n", fnname, libs[i].libname, fn);
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72 else
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73 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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74 #endif
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75
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76 if (fn == NULL)
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77 *rc = 0; /* kill this module. */
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78
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79 return fn;
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80 }
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81
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82
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83 /* Define all the function pointers and wrappers... */
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84 #define SDL_X11_MODULE(modname)
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85 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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86 static rc (*p##fn) params = NULL; \
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87 rc fn params { ret p##fn args ; }
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88 #include "SDL_x11sym.h"
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89 #undef SDL_X11_MODULE
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90 #undef SDL_X11_SYM
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91 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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92
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93 /* Annoying varargs entry point... */
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94 #ifdef X_HAVE_UTF8_STRING
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95 XIC (*pXCreateIC)(XIM,...) = NULL;
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96 #endif
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97
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98 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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99 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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100 #define SDL_X11_SYM(rc,fn,params,args,ret)
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101 #include "SDL_x11sym.h"
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102 #undef SDL_X11_MODULE
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103 #undef SDL_X11_SYM
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104
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105
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106 static int x11_load_refcount = 0;
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107
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108 void SDL_X11_UnloadSymbols(void)
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109 {
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110 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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111 /* Don't actually unload if more than one module is using the libs... */
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112 if (x11_load_refcount > 0) {
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113 if (--x11_load_refcount == 0) {
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114 /* set all the function pointers to NULL. */
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115 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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116 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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117 #include "SDL_x11sym.h"
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118 #undef SDL_X11_MODULE
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119 #undef SDL_X11_SYM
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120
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121 #ifdef X_HAVE_UTF8_STRING
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122 pXCreateIC = NULL;
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123 #endif
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124
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125 if (x11_handle != NULL) {
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126 SDL_UnloadObject(x11_handle);
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127 x11_handle = NULL;
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128 }
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129 if (x11ext_handle != NULL) {
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130 SDL_UnloadObject(x11ext_handle);
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131 x11ext_handle = NULL;
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132 }
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133 }
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134 }
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135 #endif
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136 }
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137
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138 /* returns non-zero if all needed symbols were loaded. */
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139 int SDL_X11_LoadSymbols(void)
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140 {
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141 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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142
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143 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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144 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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145 if (x11_load_refcount++ == 0) {
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146 int *thismod = NULL;
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147 x11_handle = SDL_LoadObject(x11_library);
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148 x11ext_handle = SDL_LoadObject(x11ext_library);
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149 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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150 #define SDL_X11_SYM(a,fn,x,y,z) p##fn = X11_GetSym(#fn,thismod);
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151 #include "SDL_x11sym.h"
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152 #undef SDL_X11_MODULE
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153 #undef SDL_X11_SYM
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154
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155 #ifdef X_HAVE_UTF8_STRING
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156 pXCreateIC = X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8);
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157 #endif
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158
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159 if (!SDL_X11_HAVE_BASEXLIB) { /* some required symbol didn't load. */
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160 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
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161 }
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162 }
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163 #else
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164 #ifdef X_HAVE_UTF8_STRING
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165 pXCreateIC = XCreateIC;
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166 #endif
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167 #endif
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168
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169 return rc;
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170 }
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171
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172 /* end of SDL_x11dyn.c ... */
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173