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/*
** 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.
*/
//#define LOG_NDEBUG 0
#define ATRACE_TAG ATRACE_TAG_GRAPHICS
#include "Loader.h"
#include <string>
#include <dirent.h>
#include <dlfcn.h>
#include <android/dlext.h>
#include <cutils/properties.h>
#include <log/log.h>
#ifndef __ANDROID_VNDK__
#include <graphicsenv/GraphicsEnv.h>
#endif
#include <vndksupport/linker.h>
#include "egl_trace.h"
#include "egldefs.h"
extern "C" {
android_namespace_t* android_get_exported_namespace(const char*);
}
// ----------------------------------------------------------------------------
namespace android {
// ----------------------------------------------------------------------------
/*
* EGL userspace drivers must be provided either:
* - as a single library:
* /vendor/lib/egl/libGLES.so
*
* - as separate libraries:
* /vendor/lib/egl/libEGL.so
* /vendor/lib/egl/libGLESv1_CM.so
* /vendor/lib/egl/libGLESv2.so
*
* The software renderer for the emulator must be provided as a single
* library at:
*
* /system/lib/egl/libGLES_android.so
*
*
* For backward compatibility and to facilitate the transition to
* this new naming scheme, the loader will additionally look for:
*
* /{vendor|system}/lib/egl/lib{GLES | [EGL|GLESv1_CM|GLESv2]}_*.so
*
*/
Loader& Loader::getInstance() {
static Loader loader;
return loader;
}
/* This function is called to check whether we run inside the emulator,
* and if this is the case whether GLES GPU emulation is supported.
*
* Returned values are:
* -1 -> not running inside the emulator
* 0 -> running inside the emulator, but GPU emulation not supported
* 1 -> running inside the emulator, GPU emulation is supported
* through the "emulation" host-side OpenGL ES implementation.
* 2 -> running inside the emulator, GPU emulation is supported
* through a guest-side vendor driver's OpenGL ES implementation.
*/
static int
checkGlesEmulationStatus(void)
{
/* We're going to check for the following kernel parameters:
*
* qemu=1 -> tells us that we run inside the emulator
* android.qemu.gles=<number> -> tells us the GLES GPU emulation status
*
* Note that we will return <number> if we find it. This let us support
* more additionnal emulation modes in the future.
*/
char prop[PROPERTY_VALUE_MAX];
int result = -1;
/* First, check for qemu=1 */
property_get("ro.kernel.qemu",prop,"0");
if (atoi(prop) != 1)
return -1;
/* We are in the emulator, get GPU status value */
property_get("qemu.gles",prop,"0");
return atoi(prop);
}
static void* do_dlopen(const char* path, int mode) {
ATRACE_CALL();
return dlopen(path, mode);
}
static void* do_android_dlopen_ext(const char* path, int mode, const android_dlextinfo* info) {
ATRACE_CALL();
return android_dlopen_ext(path, mode, info);
}
static void* do_android_load_sphal_library(const char* path, int mode) {
ATRACE_CALL();
return android_load_sphal_library(path, mode);
}
// ----------------------------------------------------------------------------
Loader::driver_t::driver_t(void* gles)
{
dso[0] = gles;
for (size_t i=1 ; i<NELEM(dso) ; i++)
dso[i] = nullptr;
}
Loader::driver_t::~driver_t()
{
for (size_t i=0 ; i<NELEM(dso) ; i++) {
if (dso[i]) {
dlclose(dso[i]);
dso[i] = nullptr;
}
}
}
int 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 -EOVERFLOW;
}
return 0;
}
// ----------------------------------------------------------------------------
Loader::Loader()
: getProcAddress(nullptr)
{
}
Loader::~Loader() {
}
static void* load_wrapper(const char* path) {
void* so = do_dlopen(path, RTLD_NOW | RTLD_LOCAL);
ALOGE_IF(!so, "dlopen(\"%s\") failed: %s", path, dlerror());
return so;
}
#ifndef EGL_WRAPPER_DIR
#if defined(__LP64__)
#define EGL_WRAPPER_DIR "/system/lib64"
#else
#define EGL_WRAPPER_DIR "/system/lib"
#endif
#endif
static void setEmulatorGlesValue(void) {
char prop[PROPERTY_VALUE_MAX];
property_get("ro.kernel.qemu", prop, "0");
if (atoi(prop) != 1) return;
property_get("ro.kernel.qemu.gles",prop,"0");
if (atoi(prop) == 1) {
ALOGD("Emulator has host GPU support, qemu.gles is set to 1.");
property_set("qemu.gles", "1");
return;
}
// for now, checking the following
// directory is good enough for emulator system images
const char* vendor_lib_path =
#if defined(__LP64__)
"/vendor/lib64/egl";
#else
"/vendor/lib/egl";
#endif
const bool has_vendor_lib = (access(vendor_lib_path, R_OK) == 0);
if (has_vendor_lib) {
ALOGD("Emulator has vendor provided software renderer, qemu.gles is set to 2.");
property_set("qemu.gles", "2");
} else {
ALOGD("Emulator without GPU support detected. "
"Fallback to legacy software renderer, qemu.gles is set to 0.");
property_set("qemu.gles", "0");
}
}
void* Loader::open(egl_connection_t* cnx)
{
ATRACE_CALL();
void* dso;
driver_t* hnd = nullptr;
setEmulatorGlesValue();
dso = load_driver("GLES", cnx, EGL | GLESv1_CM | GLESv2);
if (dso) {
hnd = new driver_t(dso);
} else {
// Always load EGL first
dso = load_driver("EGL", cnx, EGL);
if (dso) {
hnd = new driver_t(dso);
hnd->set( load_driver("GLESv1_CM", cnx, GLESv1_CM), GLESv1_CM );
hnd->set( load_driver("GLESv2", cnx, GLESv2), GLESv2 );
}
}
LOG_ALWAYS_FATAL_IF(!hnd, "couldn't find an OpenGL ES implementation");
cnx->libEgl = load_wrapper(EGL_WRAPPER_DIR "/libEGL.so");
cnx->libGles2 = load_wrapper(EGL_WRAPPER_DIR "/libGLESv2.so");
cnx->libGles1 = load_wrapper(EGL_WRAPPER_DIR "/libGLESv1_CM.so");
LOG_ALWAYS_FATAL_IF(!cnx->libEgl,
"couldn't load system EGL wrapper libraries");
LOG_ALWAYS_FATAL_IF(!cnx->libGles2 || !cnx->libGles1,
"couldn't load system OpenGL ES wrapper libraries");
return (void*)hnd;
}
void Loader::close(void* driver)
{
driver_t* hnd = (driver_t*)driver;
delete hnd;
}
void Loader::init_api(void* dso,
char const * const * api,
__eglMustCastToProperFunctionPointerType* curr,
getProcAddressType getProcAddress)
{
ATRACE_CALL();
const ssize_t SIZE = 256;
char scrap[SIZE];
while (*api) {
char const * name = *api;
__eglMustCastToProperFunctionPointerType f =
(__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
if (f == nullptr) {
// couldn't find the entry-point, use eglGetProcAddress()
f = getProcAddress(name);
}
if (f == nullptr) {
// Try without the OES postfix
ssize_t index = ssize_t(strlen(name)) - 3;
if ((index>0 && (index<SIZE-1)) && (!strcmp(name+index, "OES"))) {
strncpy(scrap, name, index);
scrap[index] = 0;
f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
//ALOGD_IF(f, "found <%s> instead", scrap);
}
}
if (f == nullptr) {
// Try with the OES postfix
ssize_t index = ssize_t(strlen(name)) - 3;
if (index>0 && strcmp(name+index, "OES")) {
snprintf(scrap, SIZE, "%sOES", name);
f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
//ALOGD_IF(f, "found <%s> instead", scrap);
}
}
if (f == nullptr) {
//ALOGD("%s", name);
f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
/*
* GL_EXT_debug_label is special, we always report it as
* supported, it's handled by GLES_trace. If GLES_trace is not
* enabled, then these are no-ops.
*/
if (!strcmp(name, "glInsertEventMarkerEXT")) {
f = (__eglMustCastToProperFunctionPointerType)gl_noop;
} else if (!strcmp(name, "glPushGroupMarkerEXT")) {
f = (__eglMustCastToProperFunctionPointerType)gl_noop;
} else if (!strcmp(name, "glPopGroupMarkerEXT")) {
f = (__eglMustCastToProperFunctionPointerType)gl_noop;
}
}
*curr++ = f;
api++;
}
}
static void* load_system_driver(const char* kind) {
ATRACE_CALL();
class MatchFile {
public:
static std::string find(const char* kind) {
std::string result;
int emulationStatus = checkGlesEmulationStatus();
switch (emulationStatus) {
case 0:
#if defined(__LP64__)
result = "/vendor/lib64/egl/libGLES_android.so";
#else
result = "/vendor/lib/egl/libGLES_android.so";
#endif
return result;
case 1:
// Use host-side OpenGL through the "emulation" library
#if defined(__LP64__)
result = std::string("/vendor/lib64/egl/lib") + kind + "_emulation.so";
#else
result = std::string("/vendor/lib/egl/lib") + kind + "_emulation.so";
#endif
return result;
case 2:
// Use guest side swiftshader library
#if defined(__LP64__)
result = std::string("/vendor/lib64/egl/lib") + kind + "_swiftshader.so";
#else
result = std::string("/vendor/lib/egl/lib") + kind + "_swiftshader.so";
#endif
return result;
default:
// Not in emulator, or use other guest-side implementation
break;
}
std::string pattern = std::string("lib") + kind;
const char* const searchPaths[] = {
#if defined(__LP64__)
"/vendor/lib64/egl",
"/system/lib64/egl"
#else
"/vendor/lib/egl",
"/system/lib/egl"
#endif
};
// first, we search for the exact name of the GLES userspace
// driver in both locations.
// i.e.:
// libGLES.so, or:
// libEGL.so, libGLESv1_CM.so, libGLESv2.so
for (size_t i=0 ; i<NELEM(searchPaths) ; i++) {
if (find(result, pattern, searchPaths[i], true)) {
return result;
}
}
// for compatibility with the old "egl.cfg" naming convention
// we look for files that match:
// libGLES_*.so, or:
// libEGL_*.so, libGLESv1_CM_*.so, libGLESv2_*.so
pattern.append("_");
for (size_t i=0 ; i<NELEM(searchPaths) ; i++) {
if (find(result, pattern, searchPaths[i], false)) {
return result;
}
}
// we didn't find the driver. gah.
result.clear();
return result;
}
private:
static bool find(std::string& result,
const std::string& pattern, const char* const search, bool exact) {
if (exact) {
std::string absolutePath = std::string(search) + "/" + pattern + ".so";
if (!access(absolutePath.c_str(), R_OK)) {
result = absolutePath;
return true;
}
return false;
}
DIR* d = opendir(search);
if (d != nullptr) {
struct dirent* e;
while ((e = readdir(d)) != nullptr) {
if (e->d_type == DT_DIR) {
continue;
}
if (!strcmp(e->d_name, "libGLES_android.so")) {
// always skip the software renderer
continue;
}
if (strstr(e->d_name, pattern.c_str()) == e->d_name) {
if (!strcmp(e->d_name + strlen(e->d_name) - 3, ".so")) {
result = std::string(search) + "/" + e->d_name;
closedir(d);
return true;
}
}
}
closedir(d);
}
return false;
}
};
std::string absolutePath = MatchFile::find(kind);
if (absolutePath.empty()) {
// this happens often, we don't want to log an error
return nullptr;
}
const char* const driver_absolute_path = absolutePath.c_str();
// Try to load drivers from the 'sphal' namespace, if it exist. Fall back to
// the original routine when the namespace does not exist.
// See /system/core/rootdir/etc/ld.config.txt for the configuration of the
// sphal namespace.
void* dso = do_android_load_sphal_library(driver_absolute_path,
RTLD_NOW | RTLD_LOCAL);
if (dso == nullptr) {
const char* err = dlerror();
ALOGE("load_driver(%s): %s", driver_absolute_path, err ? err : "unknown");
return nullptr;
}
ALOGD("loaded %s", driver_absolute_path);
return dso;
}
static const char* HAL_SUBNAME_KEY_PROPERTIES[2] = {
"ro.hardware.egl",
"ro.board.platform",
};
static void* load_updated_driver(const char* kind, android_namespace_t* ns) {
ATRACE_CALL();
const android_dlextinfo dlextinfo = {
.flags = ANDROID_DLEXT_USE_NAMESPACE,
.library_namespace = ns,
};
void* so = nullptr;
char prop[PROPERTY_VALUE_MAX + 1];
for (auto key : HAL_SUBNAME_KEY_PROPERTIES) {
if (property_get(key, prop, nullptr) > 0) {
std::string name = std::string("lib") + kind + "_" + prop + ".so";
so = do_android_dlopen_ext(name.c_str(), RTLD_LOCAL | RTLD_NOW, &dlextinfo);
if (so) {
return so;
}
}
}
return nullptr;
}
void *Loader::load_driver(const char* kind,
egl_connection_t* cnx, uint32_t mask)
{
ATRACE_CALL();
void* dso = nullptr;
#ifndef __ANDROID_VNDK__
android_namespace_t* ns = android_getDriverNamespace();
if (ns) {
dso = load_updated_driver(kind, ns);
}
#endif
if (!dso) {
dso = load_system_driver(kind);
if (!dso)
return nullptr;
}
if (mask & EGL) {
getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
ALOGE_IF(!getProcAddress,
"can't find eglGetProcAddress() in EGL driver library");
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 == nullptr) {
// couldn't find the entry-point, use eglGetProcAddress()
f = getProcAddress(name);
if (f == nullptr) {
f = (__eglMustCastToProperFunctionPointerType)nullptr;
}
}
*curr++ = f;
api++;
}
}
if (mask & GLESv1_CM) {
init_api(dso, gl_names,
(__eglMustCastToProperFunctionPointerType*)
&cnx->hooks[egl_connection_t::GLESv1_INDEX]->gl,
getProcAddress);
}
if (mask & GLESv2) {
init_api(dso, gl_names,
(__eglMustCastToProperFunctionPointerType*)
&cnx->hooks[egl_connection_t::GLESv2_INDEX]->gl,
getProcAddress);
}
return dso;
}
// ----------------------------------------------------------------------------
}; // namespace android
// ----------------------------------------------------------------------------