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 // ----------------------------------------------------------------------------
35 namespace 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
ANDROID_SINGLETON_STATIC_INSTANCE(Loader)46 ANDROID_SINGLETON_STATIC_INSTANCE( Loader )
47
48 // ----------------------------------------------------------------------------
49
50 Loader::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
~driver_t()57 Loader::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
set(void * hnd,int32_t api)67 status_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
entry_t(int dpy,int impl,const char * tag)87 Loader::entry_t::entry_t(int dpy, int impl, const char* tag)
88 : dpy(dpy), impl(impl), tag(tag) {
89 }
90
91 // ----------------------------------------------------------------------------
92
Loader()93 Loader::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
~Loader()115 Loader::~Loader()
116 {
117 }
118
getTag(int dpy,int impl)119 const 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
open(EGLNativeDisplayType display,int impl,egl_connection_t * cnx)131 void* Loader::open(EGLNativeDisplayType display, int impl, egl_connection_t* cnx)
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 int index = int(display);
140 driver_t* hnd = 0;
141
142 char const* tag = getTag(index, impl);
143 if (tag) {
144 dso = load_driver("GLES", tag, cnx, EGL | GLESv1_CM | GLESv2);
145 if (dso) {
146 hnd = new driver_t(dso);
147 } else {
148 // Always load EGL first
149 dso = load_driver("EGL", tag, cnx, EGL);
150 if (dso) {
151 hnd = new driver_t(dso);
152
153 // TODO: make this more automated
154 hnd->set( load_driver("GLESv1_CM", tag, cnx, GLESv1_CM), GLESv1_CM );
155
156 hnd->set( load_driver("GLESv2", tag, cnx, GLESv2), GLESv2 );
157 }
158 }
159 }
160
161 LOG_FATAL_IF(!index && !impl && !hnd,
162 "couldn't find the default OpenGL ES implementation "
163 "for default display");
164
165 return (void*)hnd;
166 }
167
close(void * driver)168 status_t Loader::close(void* driver)
169 {
170 driver_t* hnd = (driver_t*)driver;
171 delete hnd;
172 return NO_ERROR;
173 }
174
init_api(void * dso,char const * const * api,__eglMustCastToProperFunctionPointerType * curr,getProcAddressType getProcAddress)175 void Loader::init_api(void* dso,
176 char const * const * api,
177 __eglMustCastToProperFunctionPointerType* curr,
178 getProcAddressType getProcAddress)
179 {
180 char scrap[256];
181 while (*api) {
182 char const * name = *api;
183 __eglMustCastToProperFunctionPointerType f =
184 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
185 if (f == NULL) {
186 // couldn't find the entry-point, use eglGetProcAddress()
187 f = getProcAddress(name);
188 }
189 if (f == NULL) {
190 // Try without the OES postfix
191 ssize_t index = ssize_t(strlen(name)) - 3;
192 if ((index>0 && (index<255)) && (!strcmp(name+index, "OES"))) {
193 strncpy(scrap, name, index);
194 scrap[index] = 0;
195 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
196 //LOGD_IF(f, "found <%s> instead", scrap);
197 }
198 }
199 if (f == NULL) {
200 // Try with the OES postfix
201 ssize_t index = ssize_t(strlen(name)) - 3;
202 if ((index>0 && (index<252)) && (strcmp(name+index, "OES"))) {
203 strncpy(scrap, name, index);
204 scrap[index] = 0;
205 strcat(scrap, "OES");
206 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
207 //LOGD_IF(f, "found <%s> instead", scrap);
208 }
209 }
210 if (f == NULL) {
211 //LOGD("%s", name);
212 f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
213 }
214 *curr++ = f;
215 api++;
216 }
217 }
218
load_driver(const char * kind,const char * tag,egl_connection_t * cnx,uint32_t mask)219 void *Loader::load_driver(const char* kind, const char *tag,
220 egl_connection_t* cnx, uint32_t mask)
221 {
222 char driver_absolute_path[PATH_MAX];
223 const char* const search1 = "/vendor/lib/egl/lib%s_%s.so";
224 const char* const search2 = "/system/lib/egl/lib%s_%s.so";
225
226 snprintf(driver_absolute_path, PATH_MAX, search1, kind, tag);
227 if (access(driver_absolute_path, R_OK)) {
228 snprintf(driver_absolute_path, PATH_MAX, search2, kind, tag);
229 if (access(driver_absolute_path, R_OK)) {
230 // this happens often, we don't want to log an error
231 return 0;
232 }
233 }
234
235 void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
236 if (dso == 0) {
237 const char* err = dlerror();
238 LOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
239 return 0;
240 }
241
242 LOGD("loaded %s", driver_absolute_path);
243
244 if (mask & EGL) {
245 getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
246
247 LOGE_IF(!getProcAddress,
248 "can't find eglGetProcAddress() in %s", driver_absolute_path);
249
250 egl_t* egl = &cnx->egl;
251 __eglMustCastToProperFunctionPointerType* curr =
252 (__eglMustCastToProperFunctionPointerType*)egl;
253 char const * const * api = egl_names;
254 while (*api) {
255 char const * name = *api;
256 __eglMustCastToProperFunctionPointerType f =
257 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
258 if (f == NULL) {
259 // couldn't find the entry-point, use eglGetProcAddress()
260 f = getProcAddress(name);
261 if (f == NULL) {
262 f = (__eglMustCastToProperFunctionPointerType)0;
263 }
264 }
265 *curr++ = f;
266 api++;
267 }
268 }
269
270 if (mask & GLESv1_CM) {
271 init_api(dso, gl_names,
272 (__eglMustCastToProperFunctionPointerType*)
273 &cnx->hooks[GLESv1_INDEX]->gl,
274 getProcAddress);
275 }
276
277 if (mask & GLESv2) {
278 init_api(dso, gl_names,
279 (__eglMustCastToProperFunctionPointerType*)
280 &cnx->hooks[GLESv2_INDEX]->gl,
281 getProcAddress);
282 }
283
284 return dso;
285 }
286
287 // ----------------------------------------------------------------------------
288 }; // namespace android
289 // ----------------------------------------------------------------------------
290