Loader.cpp revision 82fd4fce16b9bbde25d044acc86ddf7306ebdd10
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 25#include <cutils/log.h> 26 27#include <EGL/egl.h> 28 29#include "hooks.h" 30#include "egl_impl.h" 31 32#include "Loader.h" 33 34// ---------------------------------------------------------------------------- 35namespace android { 36// ---------------------------------------------------------------------------- 37 38 39/* 40 * EGL drivers are called 41 * 42 * /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.so 43 * 44 */ 45 46ANDROID_SINGLETON_STATIC_INSTANCE( Loader ) 47 48// ---------------------------------------------------------------------------- 49 50Loader::driver_t::driver_t(void* gles) 51{ 52 dso[0] = gles; 53 for (size_t i=1 ; i<NELEM(dso) ; i++) 54 dso[i] = 0; 55} 56 57Loader::driver_t::~driver_t() 58{ 59 for (size_t i=0 ; i<NELEM(dso) ; i++) { 60 if (dso[i]) { 61 dlclose(dso[i]); 62 dso[i] = 0; 63 } 64 } 65} 66 67status_t Loader::driver_t::set(void* hnd, int32_t api) 68{ 69 switch (api) { 70 case EGL: 71 dso[0] = hnd; 72 break; 73 case GLESv1_CM: 74 dso[1] = hnd; 75 break; 76 case GLESv2: 77 dso[2] = hnd; 78 break; 79 default: 80 return BAD_INDEX; 81 } 82 return NO_ERROR; 83} 84 85// ---------------------------------------------------------------------------- 86 87Loader::entry_t::entry_t(int dpy, int impl, const char* tag) 88 : dpy(dpy), impl(impl), tag(tag) { 89} 90 91// ---------------------------------------------------------------------------- 92 93Loader::Loader() 94{ 95 char line[256]; 96 char tag[256]; 97 FILE* cfg = fopen("/system/lib/egl/egl.cfg", "r"); 98 if (cfg == NULL) { 99 // default config 100 LOGD("egl.cfg not found, using default config"); 101 gConfig.add( entry_t(0, 0, "android") ); 102 } else { 103 while (fgets(line, 256, cfg)) { 104 int dpy; 105 int impl; 106 if (sscanf(line, "%u %u %s", &dpy, &impl, tag) == 3) { 107 //LOGD(">>> %u %u %s", dpy, impl, tag); 108 gConfig.add( entry_t(dpy, impl, tag) ); 109 } 110 } 111 fclose(cfg); 112 } 113} 114 115Loader::~Loader() 116{ 117} 118 119const char* Loader::getTag(int dpy, int impl) 120{ 121 const Vector<entry_t>& cfgs(gConfig); 122 const size_t c = cfgs.size(); 123 for (size_t i=0 ; i<c ; i++) { 124 if (dpy == cfgs[i].dpy) 125 if (impl == cfgs[i].impl) 126 return cfgs[i].tag.string(); 127 } 128 return 0; 129} 130 131void* Loader::open(EGLNativeDisplayType display, int impl, gl_hooks_t* hooks) 132{ 133 /* 134 * TODO: if we don't find display/0, then use 0/0 135 * (0/0 should always work) 136 */ 137 138 void* dso; 139 char path[PATH_MAX]; 140 int index = int(display); 141 driver_t* hnd = 0; 142 const char* const format = "/system/lib/egl/lib%s_%s.so"; 143 144 char const* tag = getTag(index, impl); 145 if (tag) { 146 snprintf(path, PATH_MAX, format, "GLES", tag); 147 dso = load_driver(path, hooks, EGL | GLESv1_CM | GLESv2); 148 if (dso) { 149 hnd = new driver_t(dso); 150 } else { 151 // Always load EGL first 152 snprintf(path, PATH_MAX, format, "EGL", tag); 153 dso = load_driver(path, hooks, EGL); 154 if (dso) { 155 hnd = new driver_t(dso); 156 157 // TODO: make this more automated 158 snprintf(path, PATH_MAX, format, "GLESv1_CM", tag); 159 hnd->set( load_driver(path, hooks, GLESv1_CM), GLESv1_CM ); 160 161 snprintf(path, PATH_MAX, format, "GLESv2", tag); 162 hnd->set( load_driver(path, hooks, GLESv2), GLESv2 ); 163 } 164 } 165 } 166 167 LOG_FATAL_IF(!index && !impl && !hnd, 168 "couldn't find the default OpenGL ES implementation " 169 "for default display"); 170 171 return (void*)hnd; 172} 173 174status_t Loader::close(void* driver) 175{ 176 driver_t* hnd = (driver_t*)driver; 177 delete hnd; 178 return NO_ERROR; 179} 180 181void Loader::init_api(void* dso, 182 char const * const * api, 183 __eglMustCastToProperFunctionPointerType* curr, 184 getProcAddressType getProcAddress) 185{ 186 char scrap[256]; 187 while (*api) { 188 char const * name = *api; 189 __eglMustCastToProperFunctionPointerType f = 190 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name); 191 if (f == NULL) { 192 // couldn't find the entry-point, use eglGetProcAddress() 193 f = getProcAddress(name); 194 } 195 if (f == NULL) { 196 // Try without the OES postfix 197 ssize_t index = ssize_t(strlen(name)) - 3; 198 if ((index>0 && (index<255)) && (!strcmp(name+index, "OES"))) { 199 strncpy(scrap, name, index); 200 scrap[index] = 0; 201 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap); 202 //LOGD_IF(f, "found <%s> instead", scrap); 203 } 204 } 205 if (f == NULL) { 206 // Try with the OES postfix 207 ssize_t index = ssize_t(strlen(name)) - 3; 208 if ((index>0 && (index<252)) && (strcmp(name+index, "OES"))) { 209 strncpy(scrap, name, index); 210 scrap[index] = 0; 211 strcat(scrap, "OES"); 212 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap); 213 //LOGD_IF(f, "found <%s> instead", scrap); 214 } 215 } 216 if (f == NULL) { 217 //LOGD("%s", name); 218 f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented; 219 } 220 *curr++ = f; 221 api++; 222 } 223} 224 225void *Loader::load_driver(const char* driver, gl_hooks_t* hooks, uint32_t mask) 226{ 227 void* dso = dlopen(driver, RTLD_NOW | RTLD_LOCAL); 228 if (dso == 0) 229 return 0; 230 231 LOGD("loaded %s", driver); 232 233 if (mask & EGL) { 234 getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress"); 235 236 LOGE_IF(!getProcAddress, 237 "can't find eglGetProcAddress() in %s", driver); 238 239 gl_hooks_t::egl_t* egl = &hooks->egl; 240 __eglMustCastToProperFunctionPointerType* curr = 241 (__eglMustCastToProperFunctionPointerType*)egl; 242 char const * const * api = egl_names; 243 while (*api) { 244 char const * name = *api; 245 __eglMustCastToProperFunctionPointerType f = 246 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name); 247 if (f == NULL) { 248 // couldn't find the entry-point, use eglGetProcAddress() 249 f = getProcAddress(name); 250 if (f == NULL) { 251 f = (__eglMustCastToProperFunctionPointerType)0; 252 } 253 } 254 *curr++ = f; 255 api++; 256 } 257 } 258 259 if (mask & GLESv1_CM) { 260 init_api(dso, gl_names, 261 (__eglMustCastToProperFunctionPointerType*)&hooks->gl, 262 getProcAddress); 263 } 264 265 if (mask & GLESv2) { 266 init_api(dso, gl2_names, 267 (__eglMustCastToProperFunctionPointerType*)&hooks->gl2, 268 getProcAddress); 269 } 270 271 return dso; 272} 273 274// ---------------------------------------------------------------------------- 275}; // namespace android 276// ---------------------------------------------------------------------------- 277