SDL_kmsdrm_legacy_dyn.c (5424B)
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 22 #include "../../SDL_internal.h" 23 24 #if SDL_VIDEO_DRIVER_KMSDRM 25 26 #define DEBUG_DYNAMIC_KMSDRM_LEGACY 0 27 28 #include "SDL_kmsdrm_legacy_dyn.h" 29 30 #ifdef SDL_VIDEO_DRIVER_KMSDRM_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 } kmsdrmdynlib; 40 41 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC 42 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC NULL 43 #endif 44 #ifndef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM 45 #define SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM NULL 46 #endif 47 48 static kmsdrmdynlib kmsdrmlibs[] = { 49 {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC_GBM}, 50 {NULL, SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC} 51 }; 52 53 static void * 54 KMSDRM_LEGACY_GetSym(const char *fnname, int *pHasModule) 55 { 56 int i; 57 void *fn = NULL; 58 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) { 59 if (kmsdrmlibs[i].lib != NULL) { 60 fn = SDL_LoadFunction(kmsdrmlibs[i].lib, fnname); 61 if (fn != NULL) 62 break; 63 } 64 } 65 66 #if DEBUG_DYNAMIC_KMSDRM_LEGACY 67 if (fn != NULL) 68 SDL_Log("KMSDRM_LEGACY: Found '%s' in %s (%p)\n", fnname, kmsdrmlibs[i].libname, fn); 69 else 70 SDL_Log("KMSDRM_LEGACY: Symbol '%s' NOT FOUND!\n", fnname); 71 #endif 72 73 if (fn == NULL) 74 *pHasModule = 0; /* kill this module. */ 75 76 return fn; 77 } 78 79 #endif /* SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC */ 80 81 /* Define all the function pointers and wrappers... */ 82 #define SDL_KMSDRM_LEGACY_MODULE(modname) int SDL_KMSDRM_LEGACY_HAVE_##modname = 0; 83 #define SDL_KMSDRM_LEGACY_SYM(rc,fn,params) SDL_DYNKMSDRM_LEGACYFN_##fn KMSDRM_LEGACY_##fn = NULL; 84 #define SDL_KMSDRM_LEGACY_SYM_CONST(type,name) SDL_DYNKMSDRM_LEGACYCONST_##name KMSDRM_LEGACY_##name = NULL; 85 #include "SDL_kmsdrm_legacy_sym.h" 86 87 static int kmsdrm_load_refcount = 0; 88 89 void 90 SDL_KMSDRM_LEGACY_UnloadSymbols(void) 91 { 92 /* Don't actually unload if more than one module is using the libs... */ 93 if (kmsdrm_load_refcount > 0) { 94 if (--kmsdrm_load_refcount == 0) { 95 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC 96 int i; 97 #endif 98 99 /* set all the function pointers to NULL. */ 100 #define SDL_KMSDRM_LEGACY_MODULE(modname) SDL_KMSDRM_LEGACY_HAVE_##modname = 0; 101 #define SDL_KMSDRM_LEGACY_SYM(rc,fn,params) KMSDRM_LEGACY_##fn = NULL; 102 #define SDL_KMSDRM_LEGACY_SYM_CONST(type,name) KMSDRM_LEGACY_##name = NULL; 103 #include "SDL_kmsdrm_legacy_sym.h" 104 105 106 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC 107 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) { 108 if (kmsdrmlibs[i].lib != NULL) { 109 SDL_UnloadObject(kmsdrmlibs[i].lib); 110 kmsdrmlibs[i].lib = NULL; 111 } 112 } 113 #endif 114 } 115 } 116 } 117 118 /* returns non-zero if all needed symbols were loaded. */ 119 int 120 SDL_KMSDRM_LEGACY_LoadSymbols(void) 121 { 122 int rc = 1; /* always succeed if not using Dynamic KMSDRM_LEGACY stuff. */ 123 124 /* deal with multiple modules needing these symbols... */ 125 if (kmsdrm_load_refcount++ == 0) { 126 #ifdef SDL_VIDEO_DRIVER_KMSDRM_DYNAMIC 127 int i; 128 int *thismod = NULL; 129 for (i = 0; i < SDL_TABLESIZE(kmsdrmlibs); i++) { 130 if (kmsdrmlibs[i].libname != NULL) { 131 kmsdrmlibs[i].lib = SDL_LoadObject(kmsdrmlibs[i].libname); 132 } 133 } 134 135 #define SDL_KMSDRM_LEGACY_MODULE(modname) SDL_KMSDRM_LEGACY_HAVE_##modname = 1; /* default yes */ 136 #include "SDL_kmsdrm_legacy_sym.h" 137 138 #define SDL_KMSDRM_LEGACY_MODULE(modname) thismod = &SDL_KMSDRM_LEGACY_HAVE_##modname; 139 #define SDL_KMSDRM_LEGACY_SYM(rc,fn,params) KMSDRM_LEGACY_##fn = (SDL_DYNKMSDRM_LEGACYFN_##fn) KMSDRM_LEGACY_GetSym(#fn,thismod); 140 #define SDL_KMSDRM_LEGACY_SYM_CONST(type,name) KMSDRM_LEGACY_##name = *(SDL_DYNKMSDRM_LEGACYCONST_##name*) KMSDRM_LEGACY_GetSym(#name,thismod); 141 #include "SDL_kmsdrm_legacy_sym.h" 142 143 if ((SDL_KMSDRM_LEGACY_HAVE_LIBDRM) && (SDL_KMSDRM_LEGACY_HAVE_GBM)) { 144 /* all required symbols loaded. */ 145 SDL_ClearError(); 146 } else { 147 /* in case something got loaded... */ 148 SDL_KMSDRM_LEGACY_UnloadSymbols(); 149 rc = 0; 150 } 151 152 #else /* no dynamic KMSDRM_LEGACY */ 153 154 #define SDL_KMSDRM_LEGACY_MODULE(modname) SDL_KMSDRM_LEGACY_HAVE_##modname = 1; /* default yes */ 155 #define SDL_KMSDRM_LEGACY_SYM(rc,fn,params) KMSDRM_LEGACY_##fn = fn; 156 #define SDL_KMSDRM_LEGACY_SYM_CONST(type,name) KMSDRM_LEGACY_##name = name; 157 #include "SDL_kmsdrm_legacy_sym.h" 158 159 #endif 160 } 161 162 return rc; 163 } 164 165 #endif /* SDL_VIDEO_DRIVER_KMSDRM */ 166 167 /* vi: set ts=4 sw=4 expandtab: */