Loader.cpp revision b4ba50dd833d8b94043635663f2ee1ad0cb54b35 
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 "../glestrace.h"
31
32#include "egldefs.h"
33#include "Loader.h"
34
35// ----------------------------------------------------------------------------
36namespace 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
47ANDROID_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 */
58static int
59checkGlesEmulationStatus(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
84static 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
102Loader::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
109Loader::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
119status_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
139Loader::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 (String8("android") != tag) {
165                    mDriverTag = tag;
166                }
167            }
168        }
169        fclose(cfg);
170    }
171}
172
173Loader::~Loader()
174{
175    GLTrace_stop();
176}
177
178void* 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
207status_t Loader::close(void* driver)
208{
209    driver_t* hnd = (driver_t*)driver;
210    delete hnd;
211    return NO_ERROR;
212}
213
214void 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
270void *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