/*
** Copyright 2007, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <dlfcn.h>
#include <limits.h>
#include <cutils/log.h>
#include <EGL/egl.h>
#include "hooks.h"
#include "egl_impl.h"
#include "Loader.h"
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
/*
* EGL drivers are called
*
* /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.so
*
*/
ANDROID_SINGLETON_STATIC_INSTANCE( Loader )
// ----------------------------------------------------------------------------
Loader::driver_t::driver_t(void* gles)
{
dso[0] = gles;
for (size_t i=1 ; i<NELEM(dso) ; i++)
dso[i] = 0;
}
Loader::driver_t::~driver_t()
{
for (size_t i=0 ; i<NELEM(dso) ; i++) {
if (dso[i]) {
dlclose(dso[i]);
dso[i] = 0;
}
}
}
status_t Loader::driver_t::set(void* hnd, int32_t api)
{
switch (api) {
case EGL:
dso[0] = hnd;
break;
case GLESv1_CM:
dso[1] = hnd;
break;
case GLESv2:
dso[2] = hnd;
break;
default:
return BAD_INDEX;
}
return NO_ERROR;
}
// ----------------------------------------------------------------------------
Loader::entry_t::entry_t(int dpy, int impl, const char* tag)
: dpy(dpy), impl(impl), tag(tag) {
}
// ----------------------------------------------------------------------------
Loader::Loader()
{
char line[256];
char tag[256];
FILE* cfg = fopen("/system/lib/egl/egl.cfg", "r");
if (cfg == NULL) {
// default config
LOGD("egl.cfg not found, using default config");
gConfig.add( entry_t(0, 0, "android") );
} else {
while (fgets(line, 256, cfg)) {
int dpy;
int impl;
if (sscanf(line, "%u %u %s", &dpy, &impl, tag) == 3) {
//LOGD(">>> %u %u %s", dpy, impl, tag);
gConfig.add( entry_t(dpy, impl, tag) );
}
}
fclose(cfg);
}
}
Loader::~Loader()
{
}
const char* Loader::getTag(int dpy, int impl)
{
const Vector<entry_t>& cfgs(gConfig);
const size_t c = cfgs.size();
for (size_t i=0 ; i<c ; i++) {
if (dpy == cfgs[i].dpy)
if (impl == cfgs[i].impl)
return cfgs[i].tag.string();
}
return 0;
}
void* Loader::open(EGLNativeDisplayType display, int impl, egl_connection_t* cnx)
{
/*
* TODO: if we don't find display/0, then use 0/0
* (0/0 should always work)
*/
void* dso;
char path[PATH_MAX];
int index = int(display);
driver_t* hnd = 0;
const char* const format = "/system/lib/egl/lib%s_%s.so";
char const* tag = getTag(index, impl);
if (tag) {
snprintf(path, PATH_MAX, format, "GLES", tag);
dso = load_driver(path, cnx, EGL | GLESv1_CM | GLESv2);
if (dso) {
hnd = new driver_t(dso);
} else {
// Always load EGL first
snprintf(path, PATH_MAX, format, "EGL", tag);
dso = load_driver(path, cnx, EGL);
if (dso) {
hnd = new driver_t(dso);
// TODO: make this more automated
snprintf(path, PATH_MAX, format, "GLESv1_CM", tag);
hnd->set( load_driver(path, cnx, GLESv1_CM), GLESv1_CM );
snprintf(path, PATH_MAX, format, "GLESv2", tag);
hnd->set( load_driver(path, cnx, GLESv2), GLESv2 );
}
}
}
LOG_FATAL_IF(!index && !impl && !hnd,
"couldn't find the default OpenGL ES implementation "
"for default display");
return (void*)hnd;
}
status_t Loader::close(void* driver)
{
driver_t* hnd = (driver_t*)driver;
delete hnd;
return NO_ERROR;
}
void Loader::init_api(void* dso,
char const * const * api,
__eglMustCastToProperFunctionPointerType* curr,
getProcAddressType getProcAddress)
{
char scrap[256];
while (*api) {
char const * name = *api;
__eglMustCastToProperFunctionPointerType f =
(__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
if (f == NULL) {
// couldn't find the entry-point, use eglGetProcAddress()
f = getProcAddress(name);
}
if (f == NULL) {
// Try without the OES postfix
ssize_t index = ssize_t(strlen(name)) - 3;
if ((index>0 && (index<255)) && (!strcmp(name+index, "OES"))) {
strncpy(scrap, name, index);
scrap[index] = 0;
f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
//LOGD_IF(f, "found <%s> instead", scrap);
}
}
if (f == NULL) {
// Try with the OES postfix
ssize_t index = ssize_t(strlen(name)) - 3;
if ((index>0 && (index<252)) && (strcmp(name+index, "OES"))) {
strncpy(scrap, name, index);
scrap[index] = 0;
strcat(scrap, "OES");
f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
//LOGD_IF(f, "found <%s> instead", scrap);
}
}
if (f == NULL) {
//LOGD("%s", name);
f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
}
*curr++ = f;
api++;
}
}
void *Loader::load_driver(const char* driver_absolute_path,
egl_connection_t* cnx, uint32_t mask)
{
if (access(driver_absolute_path, R_OK)) {
// this happens often, we don't want to log an error
return 0;
}
void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
if (dso == 0) {
const char* err = dlerror();
LOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
return 0;
}
LOGD("loaded %s", driver_absolute_path);
if (mask & EGL) {
getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
LOGE_IF(!getProcAddress,
"can't find eglGetProcAddress() in %s", driver_absolute_path);
egl_t* egl = &cnx->egl;
__eglMustCastToProperFunctionPointerType* curr =
(__eglMustCastToProperFunctionPointerType*)egl;
char const * const * api = egl_names;
while (*api) {
char const * name = *api;
__eglMustCastToProperFunctionPointerType f =
(__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
if (f == NULL) {
// couldn't find the entry-point, use eglGetProcAddress()
f = getProcAddress(name);
if (f == NULL) {
f = (__eglMustCastToProperFunctionPointerType)0;
}
}
*curr++ = f;
api++;
}
}
if (mask & GLESv1_CM) {
init_api(dso, gl_names,
(__eglMustCastToProperFunctionPointerType*)
&cnx->hooks[GLESv1_INDEX]->gl,
getProcAddress);
}
if (mask & GLESv2) {
init_api(dso, gl_names,
(__eglMustCastToProperFunctionPointerType*)
&cnx->hooks[GLESv2_INDEX]->gl,
getProcAddress);
}
return dso;
}
// ----------------------------------------------------------------------------
}; // namespace android
// ----------------------------------------------------------------------------