Loader.cpp revision e647f3c76c5d401d5b1cc0d8a08b314bf467113d 
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#include "glesv2dbg.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// ----------------------------------------------------------------------------
50
51Loader::driver_t::driver_t(void* gles)
52{
53    dso[0] = gles;
54    for (size_t i=1 ; i<NELEM(dso) ; i++)
55        dso[i] = 0;
56}
57
58Loader::driver_t::~driver_t()
59{
60    for (size_t i=0 ; i<NELEM(dso) ; i++) {
61        if (dso[i]) {
62            dlclose(dso[i]);
63            dso[i] = 0;
64        }
65    }
66}
67
68status_t Loader::driver_t::set(void* hnd, int32_t api)
69{
70    switch (api) {
71        case EGL:
72            dso[0] = hnd;
73            break;
74        case GLESv1_CM:
75            dso[1] = hnd;
76            break;
77        case GLESv2:
78            dso[2] = hnd;
79            break;
80        default:
81            return BAD_INDEX;
82    }
83    return NO_ERROR;
84}
85
86// ----------------------------------------------------------------------------
87
88Loader::entry_t::entry_t(int dpy, int impl, const char* tag)
89    : dpy(dpy), impl(impl), tag(tag) {
90}
91
92// ----------------------------------------------------------------------------
93
94Loader::Loader()
95{
96    char line[256];
97    char tag[256];
98    FILE* cfg = fopen("/system/lib/egl/egl.cfg", "r");
99    if (cfg == NULL) {
100        // default config
101        LOGD("egl.cfg not found, using default config");
102        gConfig.add( entry_t(0, 0, "android") );
103    } else {
104        while (fgets(line, 256, cfg)) {
105            int dpy;
106            int impl;
107            if (sscanf(line, "%u %u %s", &dpy, &impl, tag) == 3) {
108                //LOGD(">>> %u %u %s", dpy, impl, tag);
109                gConfig.add( entry_t(dpy, impl, tag) );
110            }
111        }
112        fclose(cfg);
113    }
114}
115
116Loader::~Loader()
117{
118    StopDebugServer();
119}
120
121const char* Loader::getTag(int dpy, int impl)
122{
123    const Vector<entry_t>& cfgs(gConfig);
124    const size_t c = cfgs.size();
125    for (size_t i=0 ; i<c ; i++) {
126        if (dpy == cfgs[i].dpy)
127            if (impl == cfgs[i].impl)
128                return cfgs[i].tag.string();
129    }
130    return 0;
131}
132
133void* Loader::open(EGLNativeDisplayType display, int impl, egl_connection_t* cnx)
134{
135    /*
136     * TODO: if we don't find display/0, then use 0/0
137     * (0/0 should always work)
138     */
139
140    void* dso;
141    int index = int(display);
142    driver_t* hnd = 0;
143
144    char const* tag = getTag(index, impl);
145    if (tag) {
146        dso = load_driver("GLES", tag, cnx, EGL | GLESv1_CM | GLESv2);
147        if (dso) {
148            hnd = new driver_t(dso);
149        } else {
150            // Always load EGL first
151            dso = load_driver("EGL", tag, cnx, EGL);
152            if (dso) {
153                hnd = new driver_t(dso);
154
155                // TODO: make this more automated
156                hnd->set( load_driver("GLESv1_CM", tag, cnx, GLESv1_CM), GLESv1_CM );
157
158                hnd->set( load_driver("GLESv2", tag, cnx, GLESv2), GLESv2 );
159            }
160        }
161    }
162
163    LOG_FATAL_IF(!index && !impl && !hnd,
164            "couldn't find the default OpenGL ES implementation "
165            "for default display");
166
167    return (void*)hnd;
168}
169
170status_t Loader::close(void* driver)
171{
172    driver_t* hnd = (driver_t*)driver;
173    delete hnd;
174    return NO_ERROR;
175}
176
177void Loader::init_api(void* dso,
178        char const * const * api,
179        __eglMustCastToProperFunctionPointerType* curr,
180        getProcAddressType getProcAddress)
181{
182    char scrap[256];
183    while (*api) {
184        char const * name = *api;
185        __eglMustCastToProperFunctionPointerType f =
186            (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
187        if (f == NULL) {
188            // couldn't find the entry-point, use eglGetProcAddress()
189            f = getProcAddress(name);
190        }
191        if (f == NULL) {
192            // Try without the OES postfix
193            ssize_t index = ssize_t(strlen(name)) - 3;
194            if ((index>0 && (index<255)) && (!strcmp(name+index, "OES"))) {
195                strncpy(scrap, name, index);
196                scrap[index] = 0;
197                f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
198                //LOGD_IF(f, "found <%s> instead", scrap);
199            }
200        }
201        if (f == NULL) {
202            // Try with the OES postfix
203            ssize_t size  = ssize_t(strlen(name));
204            ssize_t index = size - 3;
205            if ((index>0 && (index<252)) && (strcmp(name+index, "OES"))) {
206                strncpy(scrap, name, sizeof(scrap) - 1);
207                scrap[size] = 0;
208                strncat(scrap, "OES", sizeof(scrap) - 1);
209                scrap[size + 3] = 0;
210                f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
211                //LOGD_IF(f, "found <%s> instead", scrap);
212            }
213        }
214        if (f == NULL) {
215            //LOGD("%s", name);
216            f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
217        }
218        *curr++ = f;
219        api++;
220    }
221}
222
223void *Loader::load_driver(const char* kind, const char *tag,
224        egl_connection_t* cnx, uint32_t mask)
225{
226    char driver_absolute_path[PATH_MAX];
227    const char* const search1 = "/vendor/lib/egl/lib%s_%s.so";
228    const char* const search2 = "/system/lib/egl/lib%s_%s.so";
229
230    snprintf(driver_absolute_path, PATH_MAX, search1, kind, tag);
231    if (access(driver_absolute_path, R_OK)) {
232        snprintf(driver_absolute_path, PATH_MAX, search2, kind, tag);
233        if (access(driver_absolute_path, R_OK)) {
234            // this happens often, we don't want to log an error
235            return 0;
236        }
237    }
238
239    void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
240    if (dso == 0) {
241        const char* err = dlerror();
242        LOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
243        return 0;
244    }
245
246    LOGD("loaded %s", driver_absolute_path);
247
248    if (mask & EGL) {
249        getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
250
251        LOGE_IF(!getProcAddress,
252                "can't find eglGetProcAddress() in %s", driver_absolute_path);
253
254        egl_t* egl = &cnx->egl;
255        __eglMustCastToProperFunctionPointerType* curr =
256            (__eglMustCastToProperFunctionPointerType*)egl;
257        char const * const * api = egl_names;
258        while (*api) {
259            char const * name = *api;
260            __eglMustCastToProperFunctionPointerType f =
261                (__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
262            if (f == NULL) {
263                // couldn't find the entry-point, use eglGetProcAddress()
264                f = getProcAddress(name);
265                if (f == NULL) {
266                    f = (__eglMustCastToProperFunctionPointerType)0;
267                }
268            }
269            *curr++ = f;
270            api++;
271        }
272    }
273
274    if (mask & GLESv1_CM) {
275        init_api(dso, gl_names,
276            (__eglMustCastToProperFunctionPointerType*)
277                &cnx->hooks[GLESv1_INDEX]->gl,
278            getProcAddress);
279    }
280
281    if (mask & GLESv2) {
282      init_api(dso, gl_names,
283            (__eglMustCastToProperFunctionPointerType*)
284                &cnx->hooks[GLESv2_INDEX]->gl,
285            getProcAddress);
286    }
287
288    return dso;
289}
290
291// ----------------------------------------------------------------------------
292}; // namespace android
293// ----------------------------------------------------------------------------
294