Loader.cpp revision 2b9e4f6a2490864ead44e88a68da78be5cb3da22 
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, 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
168status_t Loader::close(void* driver)
169{
170    driver_t* hnd = (driver_t*)driver;
171    delete hnd;
172    return NO_ERROR;
173}
174
175void 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
219void *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