src/video/x11/SDL_x11dyn.c
author Sam Lantinga <slouken@libsdl.org>
Sun, 02 Feb 2014 00:53:27 -0800
changeset 8149 681eb46b8ac4
parent 8093 b43765095a6f
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fixed bug 2374 - Update copyright for 2014...

Is it that time already??
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 #if SDL_VIDEO_DRIVER_X11
    24 
    25 #define DEBUG_DYNAMIC_X11 0
    26 
    27 #include "SDL_x11dyn.h"
    28 
    29 #if DEBUG_DYNAMIC_X11
    30 #include <stdio.h>
    31 #endif
    32 
    33 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
    34 
    35 #include "SDL_name.h"
    36 #include "SDL_loadso.h"
    37 
    38 typedef struct
    39 {
    40     void *lib;
    41     const char *libname;
    42 } x11dynlib;
    43 
    44 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC
    45 #define SDL_VIDEO_DRIVER_X11_DYNAMIC NULL
    46 #endif
    47 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT
    48 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT NULL
    49 #endif
    50 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR
    51 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR NULL
    52 #endif
    53 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA
    54 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA NULL
    55 #endif
    56 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2
    57 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2 NULL
    58 #endif
    59 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR
    60 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR NULL
    61 #endif
    62 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS
    63 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS NULL
    64 #endif
    65 #ifndef SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE
    66 #define SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE NULL
    67 #endif
    68 
    69 static x11dynlib x11libs[] = {
    70     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC},
    71     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XEXT},
    72     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XCURSOR},
    73     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINERAMA},
    74     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XINPUT2},
    75     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XRANDR},
    76     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XSS},
    77     {NULL, SDL_VIDEO_DRIVER_X11_DYNAMIC_XVIDMODE}
    78 };
    79 
    80 static void *
    81 X11_GetSym(const char *fnname, int *pHasModule)
    82 {
    83     int i;
    84     void *fn = NULL;
    85     for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
    86         if (x11libs[i].lib != NULL) {
    87             fn = SDL_LoadFunction(x11libs[i].lib, fnname);
    88             if (fn != NULL)
    89                 break;
    90         }
    91     }
    92 
    93 #if DEBUG_DYNAMIC_X11
    94     if (fn != NULL)
    95         printf("X11: Found '%s' in %s (%p)\n", fnname, x11libs[i].libname, fn);
    96     else
    97         printf("X11: Symbol '%s' NOT FOUND!\n", fnname);
    98 #endif
    99 
   100     if (fn == NULL)
   101         *pHasModule = 0;  /* kill this module. */
   102 
   103     return fn;
   104 }
   105 
   106 #endif /* SDL_VIDEO_DRIVER_X11_DYNAMIC */
   107 
   108 /* Define all the function pointers and wrappers... */
   109 #define SDL_X11_MODULE(modname)
   110 #define SDL_X11_SYM(rc,fn,params,args,ret) SDL_DYNX11FN_##fn X11_##fn = NULL;
   111 #include "SDL_x11sym.h"
   112 #undef SDL_X11_MODULE
   113 #undef SDL_X11_SYM
   114 
   115 /* Annoying varargs entry point... */
   116 #ifdef X_HAVE_UTF8_STRING
   117 SDL_DYNX11FN_XCreateIC X11_XCreateIC = NULL;
   118 SDL_DYNX11FN_XGetICValues X11_XGetICValues = NULL;
   119 #endif
   120 
   121 /* These SDL_X11_HAVE_* flags are here whether you have dynamic X11 or not. */
   122 #define SDL_X11_MODULE(modname) int SDL_X11_HAVE_##modname = 0;
   123 #define SDL_X11_SYM(rc,fn,params,args,ret)
   124 #include "SDL_x11sym.h"
   125 #undef SDL_X11_MODULE
   126 #undef SDL_X11_SYM
   127 
   128 static int x11_load_refcount = 0;
   129 
   130 void
   131 SDL_X11_UnloadSymbols(void)
   132 {
   133     /* Don't actually unload if more than one module is using the libs... */
   134     if (x11_load_refcount > 0) {
   135         if (--x11_load_refcount == 0) {
   136             int i;
   137 
   138             /* set all the function pointers to NULL. */
   139 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 0;
   140 #define SDL_X11_SYM(rc,fn,params,args,ret) X11_##fn = NULL;
   141 #include "SDL_x11sym.h"
   142 #undef SDL_X11_MODULE
   143 #undef SDL_X11_SYM
   144 
   145 #ifdef X_HAVE_UTF8_STRING
   146             X11_XCreateIC = NULL;
   147             X11_XGetICValues = NULL;
   148 #endif
   149 
   150 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
   151             for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
   152                 if (x11libs[i].lib != NULL) {
   153                     SDL_UnloadObject(x11libs[i].lib);
   154                     x11libs[i].lib = NULL;
   155                 }
   156             }
   157 #endif
   158         }
   159     }
   160 }
   161 
   162 /* returns non-zero if all needed symbols were loaded. */
   163 int
   164 SDL_X11_LoadSymbols(void)
   165 {
   166     int rc = 1;                 /* always succeed if not using Dynamic X11 stuff. */
   167 
   168     /* deal with multiple modules (dga, x11, etc) needing these symbols... */
   169     if (x11_load_refcount++ == 0) {
   170 #ifdef SDL_VIDEO_DRIVER_X11_DYNAMIC
   171         int i;
   172         int *thismod = NULL;
   173         for (i = 0; i < SDL_TABLESIZE(x11libs); i++) {
   174             if (x11libs[i].libname != NULL) {
   175                 x11libs[i].lib = SDL_LoadObject(x11libs[i].libname);
   176             }
   177         }
   178 
   179 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
   180 #define SDL_X11_SYM(a,fn,x,y,z)
   181 #include "SDL_x11sym.h"
   182 #undef SDL_X11_MODULE
   183 #undef SDL_X11_SYM
   184 
   185 #define SDL_X11_MODULE(modname) thismod = &SDL_X11_HAVE_##modname;
   186 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = (SDL_DYNX11FN_##fn) X11_GetSym(#fn,thismod);
   187 #include "SDL_x11sym.h"
   188 #undef SDL_X11_MODULE
   189 #undef SDL_X11_SYM
   190 
   191 #ifdef X_HAVE_UTF8_STRING
   192         X11_XCreateIC = (SDL_DYNX11FN_XCreateIC)
   193                         X11_GetSym("XCreateIC", &SDL_X11_HAVE_UTF8);
   194         X11_XGetICValues = (SDL_DYNX11FN_XGetICValues)
   195                         X11_GetSym("XGetICValues", &SDL_X11_HAVE_UTF8);
   196 #endif
   197 
   198         if (SDL_X11_HAVE_BASEXLIB) {
   199             /* all required symbols loaded. */
   200             SDL_ClearError();
   201         } else {
   202             /* in case something got loaded... */
   203             SDL_X11_UnloadSymbols();
   204             rc = 0;
   205         }
   206 
   207 #else  /* no dynamic X11 */
   208 
   209 #define SDL_X11_MODULE(modname) SDL_X11_HAVE_##modname = 1; /* default yes */
   210 #define SDL_X11_SYM(a,fn,x,y,z) X11_##fn = fn;
   211 #include "SDL_x11sym.h"
   212 #undef SDL_X11_MODULE
   213 #undef SDL_X11_SYM
   214 
   215 #ifdef X_HAVE_UTF8_STRING
   216         X11_XCreateIC = XCreateIC;
   217         X11_XGetICValues = XGetICValues;
   218 #endif
   219 #endif
   220     }
   221 
   222     return rc;
   223 }
   224 
   225 #endif /* SDL_VIDEO_DRIVER_X11 */
   226 
   227 /* vi: set ts=4 sw=4 expandtab: */