SDL_mirdyn.c (4893B)
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_MIR 24 25#define DEBUG_DYNAMIC_MIR 0 26 27#include "SDL_mirdyn.h" 28 29#if DEBUG_DYNAMIC_MIR 30#include "SDL_log.h" 31#endif 32 33#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC 34 35#include "SDL_name.h" 36#include "SDL_loadso.h" 37 38typedef struct 39{ 40 void *lib; 41 const char *libname; 42} mirdynlib; 43 44#ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC 45#define SDL_VIDEO_DRIVER_MIR_DYNAMIC NULL 46#endif 47#ifndef SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON 48#define SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON NULL 49#endif 50 51static mirdynlib mirlibs[] = { 52 {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC}, 53 {NULL, SDL_VIDEO_DRIVER_MIR_DYNAMIC_XKBCOMMON} 54}; 55 56static void * 57MIR_GetSym(const char *fnname, int *pHasModule) 58{ 59 int i; 60 void *fn = NULL; 61 for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) { 62 if (mirlibs[i].lib != NULL) { 63 fn = SDL_LoadFunction(mirlibs[i].lib, fnname); 64 if (fn != NULL) 65 break; 66 } 67 } 68 69#if DEBUG_DYNAMIC_MIR 70 if (fn != NULL) 71 SDL_Log("MIR: Found '%s' in %s (%p)\n", fnname, mirlibs[i].libname, fn); 72 else 73 SDL_Log("MIR: Symbol '%s' NOT FOUND!\n", fnname); 74#endif 75 76 if (fn == NULL) 77 *pHasModule = 0; /* kill this module. */ 78 79 return fn; 80} 81 82#endif /* SDL_VIDEO_DRIVER_MIR_DYNAMIC */ 83 84/* Define all the function pointers and wrappers... */ 85#define SDL_MIR_MODULE(modname) int SDL_MIR_HAVE_##modname = 0; 86#define SDL_MIR_SYM(rc,fn,params) SDL_DYNMIRFN_##fn MIR_##fn = NULL; 87#include "SDL_mirsym.h" 88#undef SDL_MIR_MODULE 89#undef SDL_MIR_SYM 90 91static int mir_load_refcount = 0; 92 93void 94SDL_MIR_UnloadSymbols(void) 95{ 96 /* Don't actually unload if more than one module is using the libs... */ 97 if (mir_load_refcount > 0) { 98 if (--mir_load_refcount == 0) { 99#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC 100 int i; 101#endif 102 103 /* set all the function pointers to NULL. */ 104#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 0; 105#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = NULL; 106#include "SDL_mirsym.h" 107#undef SDL_MIR_MODULE 108#undef SDL_MIR_SYM 109 110 111#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC 112 for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) { 113 if (mirlibs[i].lib != NULL) { 114 SDL_UnloadObject(mirlibs[i].lib); 115 mirlibs[i].lib = NULL; 116 } 117 } 118#endif 119 } 120 } 121} 122 123/* returns non-zero if all needed symbols were loaded. */ 124int 125SDL_MIR_LoadSymbols(void) 126{ 127 int rc = 1; /* always succeed if not using Dynamic MIR stuff. */ 128 129 /* deal with multiple modules (dga, wayland, mir, etc) needing these symbols... */ 130 if (mir_load_refcount++ == 0) { 131#ifdef SDL_VIDEO_DRIVER_MIR_DYNAMIC 132 int i; 133 int *thismod = NULL; 134 for (i = 0; i < SDL_TABLESIZE(mirlibs); i++) { 135 if (mirlibs[i].libname != NULL) { 136 mirlibs[i].lib = SDL_LoadObject(mirlibs[i].libname); 137 } 138 } 139 140#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */ 141#define SDL_MIR_SYM(rc,fn,params) 142#include "SDL_mirsym.h" 143#undef SDL_MIR_MODULE 144#undef SDL_MIR_SYM 145 146#define SDL_MIR_MODULE(modname) thismod = &SDL_MIR_HAVE_##modname; 147#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = (SDL_DYNMIRFN_##fn) MIR_GetSym(#fn,thismod); 148#include "SDL_mirsym.h" 149#undef SDL_MIR_MODULE 150#undef SDL_MIR_SYM 151 152 if ((SDL_MIR_HAVE_MIR_CLIENT) && (SDL_MIR_HAVE_XKBCOMMON)) { 153 /* all required symbols loaded. */ 154 SDL_ClearError(); 155 } else { 156 /* in case something got loaded... */ 157 SDL_MIR_UnloadSymbols(); 158 rc = 0; 159 } 160 161#else /* no dynamic MIR */ 162 163#define SDL_MIR_MODULE(modname) SDL_MIR_HAVE_##modname = 1; /* default yes */ 164#define SDL_MIR_SYM(rc,fn,params) MIR_##fn = fn; 165#include "SDL_mirsym.h" 166#undef SDL_MIR_MODULE 167#undef SDL_MIR_SYM 168 169#endif 170 } 171 172 return rc; 173} 174 175#endif /* SDL_VIDEO_DRIVER_MIR */ 176 177/* vi: set ts=4 sw=4 expandtab: */