| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 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 |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #define DEBUG_DYNAMIC_X11 0 |
| 25 | |
| 26 | #include "SDL_x11dyn.h" |
| 27 | |
| 28 | #if DEBUG_DYNAMIC_X11 |
| 29 | #include <stdio.h> |
| 30 | #endif |
| 31 | |
| 32 | #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC |
| 33 | |
| 34 | #include "SDL_name.h" |
| 35 | #include "SDL_loadso.h" |
| 36 | |
| 37 | typedef struct |
| 38 | { |
| 39 | void *lib; |
| 40 | const char *libname; |
| 41 | } x11dynlib; |
| 42 | |
| 43 | #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC |
| 44 | #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL |
| 45 | #endif |
| 46 | #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT |
| 47 | #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL |
| 48 | #endif |
| 49 | #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER |
| 50 | #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER NULL |
| 51 | #endif |
| 52 | #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR |
| 53 | #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL |
| 54 | #endif |
| 55 | |
| 56 | static x11dynlib x11libs[] = |
| 57 | { |
| 58 | { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC }, |
| 59 | { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT }, |
| 60 | { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRENDER }, |
| 61 | { NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR }, |
| 62 | }; |
| 63 | |
| 64 | static void X11_GetSym(const char *fnname, int *rc, void **fn) |
| 65 | { |
| 66 | int i; |
| 67 | for (i = 0; i < SDL_TABLESIZE(x11libs); i++) { |
| 68 | if (x11libs[i].lib != NULL) |
| 69 | { |
| 70 | *fn = SDL_LoadFunction(x11libs[i].lib, fnname); |
| 71 | if (*fn != NULL) |
| 72 | break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | #if DEBUG_DYNAMIC_X11 |
| 77 | if (*fn != NULL) |
| 78 | printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, *fn); |
| 79 | else |
| 80 | printf("X11: Symbol '%s' NOT FOUND!\n", fnname); |
| 81 | #endif |
| 82 | |
| 83 | if (*fn == NULL) |
| 84 | *rc = 0; /* kill this module. */ |
| 85 | } |
| 86 | |
| 87 | |
| 88 | /* Define all the function pointers and wrappers... */ |
| 89 | #define SDL_X11_MODULE(modname) |
| 90 | #define SDL_X11_SYM(rc,fn,params,args,ret) \ |
| 91 | static rc (*p##fn) params = NULL; \ |
| 92 | rc fn params { ret p##fn args ; } |
| 93 | #include "SDL_x11sym.h" |
| 94 | #undef SDL_X11_MODULE |
| 95 | #undef SDL_X11_SYM |
| 96 | #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */ |
| 97 | |
| 98 | /* Annoying varargs entry point... */ |
| 99 | #ifdef X_HAVE_UTF8_STRING |
| 100 | XIC (*pXCreateIC)(XIM,...) = NULL; |
| 101 | char *(*pXGetICValues)(XIC, ...) = NULL; |
| 102 | #endif |
| 103 | |
| 104 | /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */ |
| 105 | #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 1; |
| 106 | #define SDL_X11_SYM(rc,fn,params,args,ret) |
| 107 | #include "SDL_x11sym.h" |
| 108 | #undef SDL_X11_MODULE |
| 109 | #undef SDL_X11_SYM |
| 110 | |
| 111 | |
| 112 | static void *SDL_XGetRequest_workaround(Display* dpy, CARD8 type, size_t len) |
| 113 | { |
| 114 | xReq *req; |
| 115 | WORD64ALIGN |
| 116 | if (dpy->bufptr + len > dpy->bufmax) |
| 117 | _XFlush(dpy); |
| 118 | dpy->last_req = dpy->bufptr; |
| 119 | req = (xReq*)dpy->bufptr; |
| 120 | req->reqType = type; |
| 121 | req->length = len / 4; |
| 122 | dpy->bufptr += len; |
| 123 | dpy->request++; |
| 124 | return req; |
| 125 | } |
| 126 | |
| 127 | static int x11_load_refcount = 0; |
| 128 | |
| 129 | void SDL_X11_UnloadSymbols(void) |
| 130 | { |
| 131 | #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC |
| 132 | /* Don't actually unload if more than one module is using the libs... */ |
| 133 | if (x11_load_refcount > 0) { |
| 134 | if (--x11_load_refcount == 0) { |
| 135 | int i; |
| 136 | |
| 137 | /* set all the function pointers to NULL. */ |
| 138 | #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; |
| 139 | #define SDL_X11_SYM(rc,fn,params,args,ret) p##fn = NULL; |
| 140 | #include "SDL_x11sym.h" |
| 141 | #undef SDL_X11_MODULE |
| 142 | #undef SDL_X11_SYM |
| 143 | |
| 144 | #ifdef X_HAVE_UTF8_STRING |
| 145 | pXCreateIC = NULL; |
| 146 | pXGetICValues = NULL; |
| 147 | #endif |
| 148 | |
| 149 | for (i = 0; i < SDL_TABLESIZE(x11libs); i++) { |
| 150 | if (x11libs[i].lib != NULL) { |
| 151 | SDL_UnloadObject(x11libs[i].lib); |
| 152 | x11libs[i].lib = NULL; |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | } |
| 157 | #endif |
| 158 | } |
| 159 | |
| 160 | /* returns non-zero if all needed symbols were loaded. */ |
| 161 | int SDL_X11_LoadSymbols(void) |
| 162 | { |
| 163 | int rc = 1; /* always succeed if not using Dynamic X11 stuff. */ |
| 164 | |
| 165 | #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC |
| 166 | /* deal with multiple modules (dga, x11, etc) needing these symbols... */ |
| 167 | if (x11_load_refcount++ == 0) { |
| 168 | int i; |
| 169 | int *thismod = NULL; |
| 170 | for (i = 0; i < SDL_TABLESIZE(x11libs); i++) { |
| 171 | if (x11libs[i].libname != NULL) { |
| 172 | x11libs[i].lib = SDL_LoadObject(x11libs[i].libname); |
| 173 | } |
| 174 | } |
| 175 | #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname; |
| 176 | #define SDL_X11_SYM(a,fn,x,y,z) X11_GetSym(#fn,thismod,(void**)&p##fn); |
| 177 | #include "SDL_x11sym.h" |
| 178 | #undef SDL_X11_MODULE |
| 179 | #undef SDL_X11_SYM |
| 180 | |
| 181 | #ifdef X_HAVE_UTF8_STRING |
| 182 | X11_GetSym("XCreateIC",&SDL_X11_HAVE_UTF8,(void **)&pXCreateIC); |
| 183 | X11_GetSym("XGetICValues",&SDL_X11_HAVE_UTF8,(void **)&pXGetICValues); |
| 184 | #endif |
| 185 | |
| 186 | /* |
| 187 | * In case we're built with newer Xlib headers, we need to make sure |
| 188 | * that _XGetRequest() is available, even on older systems. |
| 189 | * Otherwise, various Xlib macros we use will call a NULL pointer. |
| 190 | */ |
| 191 | if (!SDL_X11_HAVE_XGETREQUEST) { |
| 192 | p_XGetRequest = SDL_XGetRequest_workaround; |
| 193 | } |
| 194 | |
| 195 | if (SDL_X11_HAVE_BASEXLIB) { /* all required symbols loaded. */ |
| 196 | SDL_ClearError(); |
| 197 | } else { |
| 198 | SDL_X11_UnloadSymbols(); /* in case something got loaded... */ |
| 199 | rc = 0; |
| 200 | } |
| 201 | } |
| 202 | #else |
| 203 | #if DEBUG_DYNAMIC_X11 |
| 204 | printf("X11: No dynamic X11 support in this build of SDL.\n"); |
| 205 | #endif |
| 206 | #ifdef X_HAVE_UTF8_STRING |
| 207 | pXCreateIC = XCreateIC; |
| 208 | pXGetICValues = XGetICValues; |
| 209 | #endif |
| 210 | #endif |
| 211 | |
| 212 | return rc; |
| 213 | } |
| 214 | |
| 215 | /* end of SDL_x11dyn.c ... */ |
| 216 | |