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 #include <cutils/properties.h>
27
28 #include <EGL/egl.h>
29
30 #include "egldefs.h"
31 #include "glestrace.h"
32 #include "hooks.h"
33 #include "Loader.h"
34
35 // ----------------------------------------------------------------------------
36 namespace android {
37 // ----------------------------------------------------------------------------
38
39
40 /*
41 * EGL drivers are called
42 *
43 * /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.so
44 *
45 */
46
ANDROID_SINGLETON_STATIC_INSTANCE(Loader)47 ANDROID_SINGLETON_STATIC_INSTANCE( Loader )
48
49 /* This function is called to check whether we run inside the emulator,
50 * and if this is the case whether GLES GPU emulation is supported.
51 *
52 * Returned values are:
53 * -1 -> not running inside the emulator
54 * 0 -> running inside the emulator, but GPU emulation not supported
55 * 1 -> running inside the emulator, GPU emulation is supported
56 * through the "emulation" config.
57 */
58 static int
59 checkGlesEmulationStatus(void)
60 {
61 /* We're going to check for the following kernel parameters:
62 *
63 * qemu=1 -> tells us that we run inside the emulator
64 * android.qemu.gles=<number> -> tells us the GLES GPU emulation status
65 *
66 * Note that we will return <number> if we find it. This let us support
67 * more additionnal emulation modes in the future.
68 */
69 char prop[PROPERTY_VALUE_MAX];
70 int result = -1;
71
72 /* First, check for qemu=1 */
73 property_get("ro.kernel.qemu",prop,"0");
74 if (atoi(prop) != 1)
75 return -1;
76
77 /* We are in the emulator, get GPU status value */
78 property_get("ro.kernel.qemu.gles",prop,"0");
79 return atoi(prop);
80 }
81
82 // ----------------------------------------------------------------------------
83
getProcessCmdline()84 static char const * getProcessCmdline() {
85 long pid = getpid();
86 char procPath[128];
87 snprintf(procPath, 128, "/proc/%ld/cmdline", pid);
88 FILE * file = fopen(procPath, "r");
89 if (file) {
90 static char cmdline[256];
91 char *str = fgets(cmdline, sizeof(cmdline) - 1, file);
92 fclose(file);
93 if (str) {
94 return cmdline;
95 }
96 }
97 return NULL;
98 }
99
100 // ----------------------------------------------------------------------------
101
driver_t(void * gles)102 Loader::driver_t::driver_t(void* gles)
103 {
104 dso[0] = gles;
105 for (size_t i=1 ; i<NELEM(dso) ; i++)
106 dso[i] = 0;
107 }
108
~driver_t()109 Loader::driver_t::~driver_t()
110 {
111 for (size_t i=0 ; i<NELEM(dso) ; i++) {
112 if (dso[i]) {
113 dlclose(dso[i]);
114 dso[i] = 0;
115 }
116 }
117 }
118
set(void * hnd,int32_t api)119 status_t Loader::driver_t::set(void* hnd, int32_t api)
120 {
121 switch (api) {
122 case EGL:
123 dso[0] = hnd;
124 break;
125 case GLESv1_CM:
126 dso[1] = hnd;
127 break;
128 case GLESv2:
129 dso[2] = hnd;
130 break;
131 default:
132 return BAD_INDEX;
133 }
134 return NO_ERROR;
135 }
136
137 // ----------------------------------------------------------------------------
138
Loader()139 Loader::Loader()
140 {
141 char line[256];
142 char tag[256];
143
144 /* Special case for GLES emulation */
145 if (checkGlesEmulationStatus() == 0) {
146 ALOGD("Emulator without GPU support detected. "
147 "Fallback to software renderer.");
148 mDriverTag.setTo("android");
149 return;
150 }
151
152 /* Otherwise, use egl.cfg */
153 FILE* cfg = fopen("/system/lib/egl/egl.cfg", "r");
154 if (cfg == NULL) {
155 // default config
156 ALOGD("egl.cfg not found, using default config");
157 mDriverTag.setTo("android");
158 } else {
159 while (fgets(line, 256, cfg)) {
160 int dpy, impl;
161 if (sscanf(line, "%u %u %s", &dpy, &impl, tag) == 3) {
162 //ALOGD(">>> %u %u %s", dpy, impl, tag);
163 // We only load the h/w accelerated implementation
164 if (tag != String8("android")) {
165 mDriverTag = tag;
166 }
167 }
168 }
169 fclose(cfg);
170 }
171 }
172
~Loader()173 Loader::~Loader()
174 {
175 GLTrace_stop();
176 }
177
open(egl_connection_t * cnx)178 void* Loader::open(egl_connection_t* cnx)
179 {
180 void* dso;
181 driver_t* hnd = 0;
182
183 char const* tag = mDriverTag.string();
184 if (tag) {
185 dso = load_driver("GLES", tag, cnx, EGL | GLESv1_CM | GLESv2);
186 if (dso) {
187 hnd = new driver_t(dso);
188 } else {
189 // Always load EGL first
190 dso = load_driver("EGL", tag, cnx, EGL);
191 if (dso) {
192 hnd = new driver_t(dso);
193 // TODO: make this more automated
194 hnd->set( load_driver("GLESv1_CM", tag, cnx, GLESv1_CM), GLESv1_CM );
195 hnd->set( load_driver("GLESv2", tag, cnx, GLESv2), GLESv2 );
196 }
197 }
198 }
199
200 LOG_FATAL_IF(!index && !hnd,
201 "couldn't find the default OpenGL ES implementation "
202 "for default display");
203
204 return (void*)hnd;
205 }
206
close(void * driver)207 status_t Loader::close(void* driver)
208 {
209 driver_t* hnd = (driver_t*)driver;
210 delete hnd;
211 return NO_ERROR;
212 }
213
init_api(void * dso,char const * const * api,__eglMustCastToProperFunctionPointerType * curr,getProcAddressType getProcAddress)214 void Loader::init_api(void* dso,
215 char const * const * api,
216 __eglMustCastToProperFunctionPointerType* curr,
217 getProcAddressType getProcAddress)
218 {
219 const ssize_t SIZE = 256;
220 char scrap[SIZE];
221 while (*api) {
222 char const * name = *api;
223 __eglMustCastToProperFunctionPointerType f =
224 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
225 if (f == NULL) {
226 // couldn't find the entry-point, use eglGetProcAddress()
227 f = getProcAddress(name);
228 }
229 if (f == NULL) {
230 // Try without the OES postfix
231 ssize_t index = ssize_t(strlen(name)) - 3;
232 if ((index>0 && (index<SIZE-1)) && (!strcmp(name+index, "OES"))) {
233 strncpy(scrap, name, index);
234 scrap[index] = 0;
235 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
236 //ALOGD_IF(f, "found <%s> instead", scrap);
237 }
238 }
239 if (f == NULL) {
240 // Try with the OES postfix
241 ssize_t index = ssize_t(strlen(name)) - 3;
242 if (index>0 && strcmp(name+index, "OES")) {
243 snprintf(scrap, SIZE, "%sOES", name);
244 f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
245 //ALOGD_IF(f, "found <%s> instead", scrap);
246 }
247 }
248 if (f == NULL) {
249 //ALOGD("%s", name);
250 f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
251
252 /*
253 * GL_EXT_debug_label is special, we always report it as
254 * supported, it's handled by GLES_trace. If GLES_trace is not
255 * enabled, then these are no-ops.
256 */
257 if (!strcmp(name, "glInsertEventMarkerEXT")) {
258 f = (__eglMustCastToProperFunctionPointerType)gl_noop;
259 } else if (!strcmp(name, "glPushGroupMarkerEXT")) {
260 f = (__eglMustCastToProperFunctionPointerType)gl_noop;
261 } else if (!strcmp(name, "glPopGroupMarkerEXT")) {
262 f = (__eglMustCastToProperFunctionPointerType)gl_noop;
263 }
264 }
265 *curr++ = f;
266 api++;
267 }
268 }
269
load_driver(const char * kind,const char * tag,egl_connection_t * cnx,uint32_t mask)270 void *Loader::load_driver(const char* kind, const char *tag,
271 egl_connection_t* cnx, uint32_t mask)
272 {
273 char driver_absolute_path[PATH_MAX];
274 const char* const search1 = "/vendor/lib/egl/lib%s_%s.so";
275 const char* const search2 = "/system/lib/egl/lib%s_%s.so";
276
277 snprintf(driver_absolute_path, PATH_MAX, search1, kind, tag);
278 if (access(driver_absolute_path, R_OK)) {
279 snprintf(driver_absolute_path, PATH_MAX, search2, kind, tag);
280 if (access(driver_absolute_path, R_OK)) {
281 // this happens often, we don't want to log an error
282 return 0;
283 }
284 }
285
286 void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
287 if (dso == 0) {
288 const char* err = dlerror();
289 ALOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
290 return 0;
291 }
292
293 ALOGD("loaded %s", driver_absolute_path);
294
295 if (mask & EGL) {
296 getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
297
298 ALOGE_IF(!getProcAddress,
299 "can't find eglGetProcAddress() in %s", driver_absolute_path);
300
301 #ifdef SYSTEMUI_PBSIZE_HACK
302 #warning "SYSTEMUI_PBSIZE_HACK enabled"
303 /*
304 * TODO: replace SYSTEMUI_PBSIZE_HACK by something less hackish
305 *
306 * Here we adjust the PB size from its default value to 512KB which
307 * is the minimum acceptable for the systemui process.
308 * We do this on low-end devices only because it allows us to enable
309 * h/w acceleration in the systemui process while keeping the
310 * memory usage down.
311 *
312 * Obviously, this is the wrong place and wrong way to make this
313 * adjustment, but at the time of this writing this was the safest
314 * solution.
315 */
316 const char *cmdline = getProcessCmdline();
317 if (strstr(cmdline, "systemui")) {
318 void *imgegl = dlopen("/vendor/lib/libIMGegl.so", RTLD_LAZY);
319 if (imgegl) {
320 unsigned int *PVRDefaultPBS =
321 (unsigned int *)dlsym(imgegl, "PVRDefaultPBS");
322 if (PVRDefaultPBS) {
323 ALOGD("setting default PBS to 512KB, was %d KB", *PVRDefaultPBS / 1024);
324 *PVRDefaultPBS = 512*1024;
325 }
326 }
327 }
328 #endif
329
330 egl_t* egl = &cnx->egl;
331 __eglMustCastToProperFunctionPointerType* curr =
332 (__eglMustCastToProperFunctionPointerType*)egl;
333 char const * const * api = egl_names;
334 while (*api) {
335 char const * name = *api;
336 __eglMustCastToProperFunctionPointerType f =
337 (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
338 if (f == NULL) {
339 // couldn't find the entry-point, use eglGetProcAddress()
340 f = getProcAddress(name);
341 if (f == NULL) {
342 f = (__eglMustCastToProperFunctionPointerType)0;
343 }
344 }
345 *curr++ = f;
346 api++;
347 }
348 }
349
350 if (mask & GLESv1_CM) {
351 init_api(dso, gl_names,
352 (__eglMustCastToProperFunctionPointerType*)
353 &cnx->hooks[egl_connection_t::GLESv1_INDEX]->gl,
354 getProcAddress);
355 }
356
357 if (mask & GLESv2) {
358 init_api(dso, gl_names,
359 (__eglMustCastToProperFunctionPointerType*)
360 &cnx->hooks[egl_connection_t::GLESv2_INDEX]->gl,
361 getProcAddress);
362 }
363
364 return dso;
365 }
366
367 // ----------------------------------------------------------------------------
368 }; // namespace android
369 // ----------------------------------------------------------------------------
370