1 /* 2 ** Copyright 2007, The Android Open Source Project 3 ** 4 ** Licensed under the Apache License, Version 2.0 (the "License"); 5 ** you may not use this file except in compliance with the License. 6 ** You may obtain a copy of the License at 7 ** 8 ** http://www.apache.org/licenses/LICENSE-2.0 9 ** 10 ** Unless required by applicable law or agreed to in writing, software 11 ** distributed under the License is distributed on an "AS IS" BASIS, 12 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 ** See the License for the specific language governing permissions and 14 ** limitations under the License. 15 */ 16 17 #include <ctype.h> 18 #include <stdlib.h> 19 #include <stdio.h> 20 #include <string.h> 21 #include <errno.h> 22 #include <dlfcn.h> 23 #include <limits.h> 24 #include <dirent.h> 25 26 #include <cutils/log.h> 27 #include <cutils/properties.h> 28 29 #include <EGL/egl.h> 30 31 #include "../glestrace.h" 32 33 #include "egldefs.h" 34 #include "Loader.h" 35 36 // ---------------------------------------------------------------------------- 37 namespace android { 38 // ---------------------------------------------------------------------------- 39 40 41 /* 42 * EGL userspace drivers must be provided either: 43 * - as a single library: 44 * /vendor/lib/egl/libGLES.so 45 * 46 * - as separate libraries: 47 * /vendor/lib/egl/libEGL.so 48 * /vendor/lib/egl/libGLESv1_CM.so 49 * /vendor/lib/egl/libGLESv2.so 50 * 51 * The software renderer for the emulator must be provided as a single 52 * library at: 53 * 54 * /system/lib/egl/libGLES_android.so 55 * 56 * 57 * For backward compatibility and to facilitate the transition to 58 * this new naming scheme, the loader will additionally look for: 59 * 60 * /{vendor|system}/lib/egl/lib{GLES | [EGL|GLESv1_CM|GLESv2]}_*.so 61 * 62 */ 63 64 ANDROID_SINGLETON_STATIC_INSTANCE( Loader ) 65 66 /* This function is called to check whether we run inside the emulator, 67 * and if this is the case whether GLES GPU emulation is supported. 68 * 69 * Returned values are: 70 * -1 -> not running inside the emulator 71 * 0 -> running inside the emulator, but GPU emulation not supported 72 * 1 -> running inside the emulator, GPU emulation is supported 73 * through the "emulation" config. 74 */ 75 static int 76 checkGlesEmulationStatus(void) 77 { 78 /* We're going to check for the following kernel parameters: 79 * 80 * qemu=1 -> tells us that we run inside the emulator 81 * android.qemu.gles=<number> -> tells us the GLES GPU emulation status 82 * 83 * Note that we will return <number> if we find it. This let us support 84 * more additionnal emulation modes in the future. 85 */ 86 char prop[PROPERTY_VALUE_MAX]; 87 int result = -1; 88 89 /* First, check for qemu=1 */ 90 property_get("ro.kernel.qemu",prop,"0"); 91 if (atoi(prop) != 1) 92 return -1; 93 94 /* We are in the emulator, get GPU status value */ 95 property_get("ro.kernel.qemu.gles",prop,"0"); 96 return atoi(prop); 97 } 98 99 // ---------------------------------------------------------------------------- 100 101 static char const * getProcessCmdline() { 102 long pid = getpid(); 103 char procPath[128]; 104 snprintf(procPath, 128, "/proc/%ld/cmdline", pid); 105 FILE * file = fopen(procPath, "r"); 106 if (file) { 107 static char cmdline[256]; 108 char *str = fgets(cmdline, sizeof(cmdline) - 1, file); 109 fclose(file); 110 if (str) { 111 return cmdline; 112 } 113 } 114 return NULL; 115 } 116 117 // ---------------------------------------------------------------------------- 118 119 Loader::driver_t::driver_t(void* gles) 120 { 121 dso[0] = gles; 122 for (size_t i=1 ; i<NELEM(dso) ; i++) 123 dso[i] = 0; 124 } 125 126 Loader::driver_t::~driver_t() 127 { 128 for (size_t i=0 ; i<NELEM(dso) ; i++) { 129 if (dso[i]) { 130 dlclose(dso[i]); 131 dso[i] = 0; 132 } 133 } 134 } 135 136 status_t Loader::driver_t::set(void* hnd, int32_t api) 137 { 138 switch (api) { 139 case EGL: 140 dso[0] = hnd; 141 break; 142 case GLESv1_CM: 143 dso[1] = hnd; 144 break; 145 case GLESv2: 146 dso[2] = hnd; 147 break; 148 default: 149 return BAD_INDEX; 150 } 151 return NO_ERROR; 152 } 153 154 // ---------------------------------------------------------------------------- 155 156 Loader::Loader() 157 : getProcAddress(NULL) { 158 } 159 160 Loader::~Loader() { 161 GLTrace_stop(); 162 } 163 164 static void* load_wrapper(const char* path) { 165 void* so = dlopen(path, RTLD_NOW | RTLD_LOCAL); 166 ALOGE_IF(!so, "dlopen(\"%s\") failed: %s", path, dlerror()); 167 return so; 168 } 169 170 void* Loader::open(egl_connection_t* cnx) 171 { 172 void* dso; 173 driver_t* hnd = 0; 174 175 dso = load_driver("GLES", cnx, EGL | GLESv1_CM | GLESv2); 176 if (dso) { 177 hnd = new driver_t(dso); 178 } else { 179 // Always load EGL first 180 dso = load_driver("EGL", cnx, EGL); 181 if (dso) { 182 hnd = new driver_t(dso); 183 hnd->set( load_driver("GLESv1_CM", cnx, GLESv1_CM), GLESv1_CM ); 184 hnd->set( load_driver("GLESv2", cnx, GLESv2), GLESv2 ); 185 } 186 } 187 188 LOG_ALWAYS_FATAL_IF(!hnd, "couldn't find an OpenGL ES implementation"); 189 190 cnx->libGles2 = load_wrapper("/system/lib/libGLESv2.so"); 191 cnx->libGles1 = load_wrapper("/system/lib/libGLESv1_CM.so"); 192 LOG_ALWAYS_FATAL_IF(!cnx->libGles2 || !cnx->libGles1, 193 "couldn't load system OpenGL ES wrapper libraries"); 194 195 return (void*)hnd; 196 } 197 198 status_t Loader::close(void* driver) 199 { 200 driver_t* hnd = (driver_t*)driver; 201 delete hnd; 202 return NO_ERROR; 203 } 204 205 void Loader::init_api(void* dso, 206 char const * const * api, 207 __eglMustCastToProperFunctionPointerType* curr, 208 getProcAddressType getProcAddress) 209 { 210 const ssize_t SIZE = 256; 211 char scrap[SIZE]; 212 while (*api) { 213 char const * name = *api; 214 __eglMustCastToProperFunctionPointerType f = 215 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name); 216 if (f == NULL) { 217 // couldn't find the entry-point, use eglGetProcAddress() 218 f = getProcAddress(name); 219 } 220 if (f == NULL) { 221 // Try without the OES postfix 222 ssize_t index = ssize_t(strlen(name)) - 3; 223 if ((index>0 && (index<SIZE-1)) && (!strcmp(name+index, "OES"))) { 224 strncpy(scrap, name, index); 225 scrap[index] = 0; 226 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap); 227 //ALOGD_IF(f, "found <%s> instead", scrap); 228 } 229 } 230 if (f == NULL) { 231 // Try with the OES postfix 232 ssize_t index = ssize_t(strlen(name)) - 3; 233 if (index>0 && strcmp(name+index, "OES")) { 234 snprintf(scrap, SIZE, "%sOES", name); 235 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap); 236 //ALOGD_IF(f, "found <%s> instead", scrap); 237 } 238 } 239 if (f == NULL) { 240 //ALOGD("%s", name); 241 f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented; 242 243 /* 244 * GL_EXT_debug_label is special, we always report it as 245 * supported, it's handled by GLES_trace. If GLES_trace is not 246 * enabled, then these are no-ops. 247 */ 248 if (!strcmp(name, "glInsertEventMarkerEXT")) { 249 f = (__eglMustCastToProperFunctionPointerType)gl_noop; 250 } else if (!strcmp(name, "glPushGroupMarkerEXT")) { 251 f = (__eglMustCastToProperFunctionPointerType)gl_noop; 252 } else if (!strcmp(name, "glPopGroupMarkerEXT")) { 253 f = (__eglMustCastToProperFunctionPointerType)gl_noop; 254 } 255 } 256 *curr++ = f; 257 api++; 258 } 259 } 260 261 void *Loader::load_driver(const char* kind, 262 egl_connection_t* cnx, uint32_t mask) 263 { 264 class MatchFile { 265 public: 266 static String8 find(const char* kind) { 267 String8 result; 268 String8 pattern; 269 pattern.appendFormat("lib%s", kind); 270 const char* const searchPaths[] = { 271 "/vendor/lib/egl", 272 "/system/lib/egl" 273 }; 274 275 // first, we search for the exact name of the GLES userspace 276 // driver in both locations. 277 // i.e.: 278 // libGLES.so, or: 279 // libEGL.so, libGLESv1_CM.so, libGLESv2.so 280 281 for (size_t i=0 ; i<NELEM(searchPaths) ; i++) { 282 if (find(result, pattern, searchPaths[i], true)) { 283 return result; 284 } 285 } 286 287 // for compatibility with the old "egl.cfg" naming convention 288 // we look for files that match: 289 // libGLES_*.so, or: 290 // libEGL_*.so, libGLESv1_CM_*.so, libGLESv2_*.so 291 292 pattern.append("_"); 293 for (size_t i=0 ; i<NELEM(searchPaths) ; i++) { 294 if (find(result, pattern, searchPaths[i], false)) { 295 return result; 296 } 297 } 298 299 // we didn't find the driver. gah. 300 result.clear(); 301 return result; 302 } 303 304 private: 305 static bool find(String8& result, 306 const String8& pattern, const char* const search, bool exact) { 307 308 // in the emulator case, we just return the hardcoded name 309 // of the software renderer. 310 if (checkGlesEmulationStatus() == 0) { 311 ALOGD("Emulator without GPU support detected. " 312 "Fallback to software renderer."); 313 result.setTo("/system/lib/egl/libGLES_android.so"); 314 return true; 315 } 316 317 if (exact) { 318 String8 absolutePath; 319 absolutePath.appendFormat("%s/%s.so", search, pattern.string()); 320 if (!access(absolutePath.string(), R_OK)) { 321 result = absolutePath; 322 return true; 323 } 324 return false; 325 } 326 327 DIR* d = opendir(search); 328 if (d != NULL) { 329 struct dirent cur; 330 struct dirent* e; 331 while (readdir_r(d, &cur, &e) == 0 && e) { 332 if (e->d_type == DT_DIR) { 333 continue; 334 } 335 if (!strcmp(e->d_name, "libGLES_android.so")) { 336 // always skip the software renderer 337 continue; 338 } 339 if (strstr(e->d_name, pattern.string()) == e->d_name) { 340 if (!strcmp(e->d_name + strlen(e->d_name) - 3, ".so")) { 341 result.clear(); 342 result.appendFormat("%s/%s", search, e->d_name); 343 closedir(d); 344 return true; 345 } 346 } 347 } 348 closedir(d); 349 } 350 return false; 351 } 352 }; 353 354 355 String8 absolutePath = MatchFile::find(kind); 356 if (absolutePath.isEmpty()) { 357 // this happens often, we don't want to log an error 358 return 0; 359 } 360 const char* const driver_absolute_path = absolutePath.string(); 361 362 void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL); 363 if (dso == 0) { 364 const char* err = dlerror(); 365 ALOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown"); 366 return 0; 367 } 368 369 ALOGD("loaded %s", driver_absolute_path); 370 371 if (mask & EGL) { 372 getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress"); 373 374 ALOGE_IF(!getProcAddress, 375 "can't find eglGetProcAddress() in %s", driver_absolute_path); 376 377 egl_t* egl = &cnx->egl; 378 __eglMustCastToProperFunctionPointerType* curr = 379 (__eglMustCastToProperFunctionPointerType*)egl; 380 char const * const * api = egl_names; 381 while (*api) { 382 char const * name = *api; 383 __eglMustCastToProperFunctionPointerType f = 384 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name); 385 if (f == NULL) { 386 // couldn't find the entry-point, use eglGetProcAddress() 387 f = getProcAddress(name); 388 if (f == NULL) { 389 f = (__eglMustCastToProperFunctionPointerType)0; 390 } 391 } 392 *curr++ = f; 393 api++; 394 } 395 } 396 397 if (mask & GLESv1_CM) { 398 init_api(dso, gl_names, 399 (__eglMustCastToProperFunctionPointerType*) 400 &cnx->hooks[egl_connection_t::GLESv1_INDEX]->gl, 401 getProcAddress); 402 } 403 404 if (mask & GLESv2) { 405 init_api(dso, gl_names, 406 (__eglMustCastToProperFunctionPointerType*) 407 &cnx->hooks[egl_connection_t::GLESv2_INDEX]->gl, 408 getProcAddress); 409 } 410 411 return dso; 412 } 413 414 // ---------------------------------------------------------------------------- 415 }; // namespace android 416 // ---------------------------------------------------------------------------- 417
