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annotate src/video/x11/SDL_x11dyn.c @ 1589:34cca785be57

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Xrandr support in the X11 target. Fixes Bugzilla #109, and as a bonus, Bugzilla #145, too!
author Ryan C. Gordon <icculus@icculus.org>
date Wed, 22 Mar 2006 11:13:58 +0000
parents 7fd9fc1f2be5
children 5115439d67b1
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 #define DEBUG_DYNAMIC_X11 0
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25
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26 #include "SDL_x11dyn.h"
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27
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28 #if DEBUG_DYNAMIC_X11
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29 #include <stdio.h>
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30 #endif
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31
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32 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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33 #include <dlfcn.h>
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34 #include "SDL_name.h"
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35 #include "SDL_loadso.h"
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36 static const char *x11_library = SDL_VIDEO_DRIVER_X11_DYNAMIC;
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37 static void *x11_handle = NULL;
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38 static const char *x11ext_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT;
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39 static void *x11ext_handle = NULL;
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40 static const char *xrender_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER;
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41 static void *xrender_handle = NULL;
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42 static const char *xrandr_library = SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR;
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43 static void *xrandr_handle = NULL;
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44
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45 typedef struct
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46 {
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47 void *lib;
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48 const char *libname;
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49 } x11libitem;
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50
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51 static void *X11_GetSym(const char *fnname, int *rc)
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52 {
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53 int i;
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54 void *fn = NULL;
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55 const x11libitem libs[] =
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56 {
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57 { x11_handle, "libX11" },
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58 { x11ext_handle, "libX11ext" },
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59 { xrender_handle, "libXrender" },
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60 { xrandr_handle, "libXrandr" },
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61 };
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62
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63 for (i = 0; i < (sizeof (libs) / sizeof (libs[0])); i++)
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64 {
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65 if (libs[i].lib != NULL)
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66 {
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67 fn = SDL_LoadFunction(libs[i].lib, fnname);
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68 if (fn != NULL)
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69 break;
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70 }
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71 }
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72
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73 #if DEBUG_DYNAMIC_X11
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74 if (fn != NULL)
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75 printf("X11: Found '%s' in %s (%p)\n", fnname, libs[i].libname, fn);
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76 else
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77 printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
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78 #endif
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79
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80 if (fn == NULL)
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81 *rc = 0; /* kill this module. */
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82
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83 return fn;
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84 }
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85
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86
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87 /* Define all the function pointers and wrappers... */
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88 #define SDL_X11_MODULE(modname)
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89 #define SDL_X11_SYM(rc,fn,params,args,ret) \
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90 static rc (*p##fn) params = NULL; \
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91 rc fn params { ret p##fn args ; }
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92 #include "SDL_x11sym.h"
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93 #undef SDL_X11_MODULE
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94 #undef SDL_X11_SYM
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95 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
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96
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97 /* Annoying varargs entry point... */
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98 #ifdef X_HAVE_UTF8_STRING
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99 XIC (*pXCreateIC)(XIM,...) = NULL;
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100 #endif
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101
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102 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
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103 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1;
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104 #define SDL_X11_SYM(rc,fn,params,args,ret)
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105 #include "SDL_x11sym.h"
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106 #undef SDL_X11_MODULE
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107 #undef SDL_X11_SYM
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108
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109
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110 static int x11_load_refcount = 0;
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111
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112 void SDL_X11_UnloadSymbols(void)
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113 {
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114 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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115 /* Don't actually unload if more than one module is using the libs... */
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116 if (x11_load_refcount > 0) {
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117 if (--x11_load_refcount == 0) {
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118 /* set all the function pointers to NULL. */
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119 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1;
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120 #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL;
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121 #include "SDL_x11sym.h"
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122 #undef SDL_X11_MODULE
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123 #undef SDL_X11_SYM
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124
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125 #ifdef X_HAVE_UTF8_STRING
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126 pXCreateIC = NULL;
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127 #endif
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128
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129 if (x11_handle != NULL) {
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130 SDL_UnloadObject(x11_handle);
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131 x11_handle = NULL;
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132 }
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133 if (x11ext_handle != NULL) {
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134 SDL_UnloadObject(x11ext_handle);
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135 x11ext_handle = NULL;
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136 }
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137 if (xrender_handle != NULL) {
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138 SDL_UnloadObject(xrender_handle);
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139 xrender_handle = NULL;
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140 }
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141 if (xrandr_handle != NULL) {
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142 SDL_UnloadObject(xrandr_handle);
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143 xrandr_handle = NULL;
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144 }
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145 }
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146 }
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147 #endif
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148 }
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149
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150 /* returns non-zero if all needed symbols were loaded. */
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151 int SDL_X11_LoadSymbols(void)
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152 {
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153 int rc = 1; /* always succeed if not using Dynamic X11 stuff. */
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154
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155 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
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156 /* deal with multiple modules (dga, x11, etc) needing these symbols... */
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157 if (x11_load_refcount++ == 0) {
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158 int *thismod = NULL;
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159 x11_handle = SDL_LoadObject(x11_library);
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160 x11ext_handle = SDL_LoadObject(x11ext_library);
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161 xrender_handle = SDL_LoadObject(xrender_library);
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162 xrandr_handle = SDL_LoadObject(xrandr_library);
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163 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
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164 #define SDL_X11_SYM(a,fn,x,y,z) p##fn = X11_GetSym(#fn,thismod);
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165 #include "SDL_x11sym.h"
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166 #undef SDL_X11_MODULE
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167 #undef SDL_X11_SYM
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168
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169 #ifdef X_HAVE_UTF8_STRING
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170 pXCreateIC = X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8);
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171 #endif
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172
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173 if (!SDL_X11_HAVE_BASEXLIB) { /* some required symbol didn't load. */
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174 SDL_X11_UnloadSymbols(); /* in case something got loaded... */
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175 }
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176 }
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177 #else
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178 #ifdef X_HAVE_UTF8_STRING
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179 pXCreateIC = XCreateIC;
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180 #endif
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181 #endif
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182
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183 return rc;
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184 }
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185
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186 /* end of SDL_x11dyn.c ... */
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187