SDL_waylanddyn.c (5395B)
1 /* 2 Simple DirectMedia Layer 3 Copyright (C) 1997-2020 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_WAYLAND 24 25 #define DEBUG_DYNAMIC_WAYLAND 0 26 27 #include "SDL_waylanddyn.h" 28 29 30 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC 31 32 #include "SDL_name.h" 33 #include "SDL_loadso.h" 34 35 typedef struct 36 { 37 void *lib; 38 const char *libname; 39 } waylanddynlib; 40 41 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL 42 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL NULL 43 #endif 44 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR 45 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR NULL 46 #endif 47 #ifndef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON 48 #define SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON NULL 49 #endif 50 51 static waylanddynlib waylandlibs[] = { 52 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC}, 53 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_EGL}, 54 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_CURSOR}, 55 {NULL, SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC_XKBCOMMON} 56 }; 57 58 static void * 59 WAYLAND_GetSym(const char *fnname, int *pHasModule) 60 { 61 int i; 62 void *fn = NULL; 63 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) { 64 if (waylandlibs[i].lib != NULL) { 65 fn = SDL_LoadFunction(waylandlibs[i].lib, fnname); 66 if (fn != NULL) 67 break; 68 } 69 } 70 71 #if DEBUG_DYNAMIC_WAYLAND 72 if (fn != NULL) 73 SDL_Log("WAYLAND: Found '%s' in %s (%p)\n", fnname, waylandlibs[i].libname, fn); 74 else 75 SDL_Log("WAYLAND: Symbol '%s' NOT FOUND!\n", fnname); 76 #endif 77 78 if (fn == NULL) 79 *pHasModule = 0; /* kill this module. */ 80 81 return fn; 82 } 83 84 #endif /* SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC */ 85 86 /* Define all the function pointers and wrappers... */ 87 #define SDL_WAYLAND_MODULE(modname) int SDL_WAYLAND_HAVE_##modname = 0; 88 #define SDL_WAYLAND_SYM(rc,fn,params) SDL_DYNWAYLANDFN_##fn WAYLAND_##fn = NULL; 89 #define SDL_WAYLAND_INTERFACE(iface) const struct wl_interface *WAYLAND_##iface = NULL; 90 #include "SDL_waylandsym.h" 91 92 static int wayland_load_refcount = 0; 93 94 void 95 SDL_WAYLAND_UnloadSymbols(void) 96 { 97 /* Don't actually unload if more than one module is using the libs... */ 98 if (wayland_load_refcount > 0) { 99 if (--wayland_load_refcount == 0) { 100 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC 101 int i; 102 #endif 103 104 /* set all the function pointers to NULL. */ 105 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 0; 106 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = NULL; 107 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = NULL; 108 #include "SDL_waylandsym.h" 109 110 111 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC 112 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) { 113 if (waylandlibs[i].lib != NULL) { 114 SDL_UnloadObject(waylandlibs[i].lib); 115 waylandlibs[i].lib = NULL; 116 } 117 } 118 #endif 119 } 120 } 121 } 122 123 /* returns non-zero if all needed symbols were loaded. */ 124 int 125 SDL_WAYLAND_LoadSymbols(void) 126 { 127 int rc = 1; /* always succeed if not using Dynamic WAYLAND stuff. */ 128 129 /* deal with multiple modules (dga, wayland, etc) needing these symbols... */ 130 if (wayland_load_refcount++ == 0) { 131 #ifdef SDL_VIDEO_DRIVER_WAYLAND_DYNAMIC 132 int i; 133 int *thismod = NULL; 134 for (i = 0; i < SDL_TABLESIZE(waylandlibs); i++) { 135 if (waylandlibs[i].libname != NULL) { 136 waylandlibs[i].lib = SDL_LoadObject(waylandlibs[i].libname); 137 } 138 } 139 140 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */ 141 #include "SDL_waylandsym.h" 142 143 #define SDL_WAYLAND_MODULE(modname) thismod = &SDL_WAYLAND_HAVE_##modname; 144 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = (SDL_DYNWAYLANDFN_##fn) WAYLAND_GetSym(#fn,thismod); 145 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = (struct wl_interface *) WAYLAND_GetSym(#iface,thismod); 146 #include "SDL_waylandsym.h" 147 148 if (SDL_WAYLAND_HAVE_WAYLAND_CLIENT) { 149 /* all required symbols loaded. */ 150 SDL_ClearError(); 151 } else { 152 /* in case something got loaded... */ 153 SDL_WAYLAND_UnloadSymbols(); 154 rc = 0; 155 } 156 157 #else /* no dynamic WAYLAND */ 158 159 #define SDL_WAYLAND_MODULE(modname) SDL_WAYLAND_HAVE_##modname = 1; /* default yes */ 160 #define SDL_WAYLAND_SYM(rc,fn,params) WAYLAND_##fn = fn; 161 #define SDL_WAYLAND_INTERFACE(iface) WAYLAND_##iface = &iface; 162 #include "SDL_waylandsym.h" 163 164 #endif 165 } 166 167 return rc; 168 } 169 170 #endif /* SDL_VIDEO_DRIVER_WAYLAND */ 171 172 /* vi: set ts=4 sw=4 expandtab: */