417 lines
13 KiB
C++
417 lines
13 KiB
C++
/*
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** Copyright 2007, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <dlfcn.h>
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#include <limits.h>
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#include <dirent.h>
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#include <cutils/log.h>
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#include <cutils/properties.h>
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#include <EGL/egl.h>
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#include "../glestrace.h"
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#include "egldefs.h"
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#include "Loader.h"
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// ----------------------------------------------------------------------------
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namespace android {
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// ----------------------------------------------------------------------------
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/*
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* EGL userspace drivers must be provided either:
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* - as a single library:
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* /vendor/lib/egl/libGLES.so
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*
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* - as separate libraries:
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* /vendor/lib/egl/libEGL.so
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* /vendor/lib/egl/libGLESv1_CM.so
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* /vendor/lib/egl/libGLESv2.so
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*
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* The software renderer for the emulator must be provided as a single
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* library at:
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*
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* /system/lib/egl/libGLES_android.so
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*
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*
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* For backward compatibility and to facilitate the transition to
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* this new naming scheme, the loader will additionally look for:
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*
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* /{vendor|system}/lib/egl/lib{GLES | [EGL|GLESv1_CM|GLESv2]}_*.so
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*
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*/
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ANDROID_SINGLETON_STATIC_INSTANCE( Loader )
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/* This function is called to check whether we run inside the emulator,
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* and if this is the case whether GLES GPU emulation is supported.
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*
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* Returned values are:
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* -1 -> not running inside the emulator
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* 0 -> running inside the emulator, but GPU emulation not supported
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* 1 -> running inside the emulator, GPU emulation is supported
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* through the "emulation" config.
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*/
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static int
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checkGlesEmulationStatus(void)
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{
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/* We're going to check for the following kernel parameters:
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*
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* qemu=1 -> tells us that we run inside the emulator
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* android.qemu.gles=<number> -> tells us the GLES GPU emulation status
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*
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* Note that we will return <number> if we find it. This let us support
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* more additionnal emulation modes in the future.
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*/
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char prop[PROPERTY_VALUE_MAX];
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int result = -1;
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/* First, check for qemu=1 */
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property_get("ro.kernel.qemu",prop,"0");
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if (atoi(prop) != 1)
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return -1;
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/* We are in the emulator, get GPU status value */
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property_get("ro.kernel.qemu.gles",prop,"0");
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return atoi(prop);
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}
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// ----------------------------------------------------------------------------
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static char const * getProcessCmdline() {
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long pid = getpid();
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char procPath[128];
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snprintf(procPath, 128, "/proc/%ld/cmdline", pid);
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FILE * file = fopen(procPath, "r");
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if (file) {
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static char cmdline[256];
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char *str = fgets(cmdline, sizeof(cmdline) - 1, file);
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fclose(file);
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if (str) {
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return cmdline;
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}
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}
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return NULL;
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}
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// ----------------------------------------------------------------------------
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Loader::driver_t::driver_t(void* gles)
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{
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dso[0] = gles;
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for (size_t i=1 ; i<NELEM(dso) ; i++)
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dso[i] = 0;
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}
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Loader::driver_t::~driver_t()
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{
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for (size_t i=0 ; i<NELEM(dso) ; i++) {
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if (dso[i]) {
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dlclose(dso[i]);
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dso[i] = 0;
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}
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}
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}
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status_t Loader::driver_t::set(void* hnd, int32_t api)
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{
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switch (api) {
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case EGL:
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dso[0] = hnd;
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break;
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case GLESv1_CM:
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dso[1] = hnd;
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break;
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case GLESv2:
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dso[2] = hnd;
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break;
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default:
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return BAD_INDEX;
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}
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return NO_ERROR;
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}
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// ----------------------------------------------------------------------------
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Loader::Loader()
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: getProcAddress(NULL) {
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}
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Loader::~Loader() {
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GLTrace_stop();
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}
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static void* load_wrapper(const char* path) {
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void* so = dlopen(path, RTLD_NOW | RTLD_LOCAL);
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ALOGE_IF(!so, "dlopen(\"%s\") failed: %s", path, dlerror());
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return so;
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}
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void* Loader::open(egl_connection_t* cnx)
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{
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void* dso;
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driver_t* hnd = 0;
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dso = load_driver("GLES", cnx, EGL | GLESv1_CM | GLESv2);
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if (dso) {
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hnd = new driver_t(dso);
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} else {
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// Always load EGL first
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dso = load_driver("EGL", cnx, EGL);
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if (dso) {
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hnd = new driver_t(dso);
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hnd->set( load_driver("GLESv1_CM", cnx, GLESv1_CM), GLESv1_CM );
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hnd->set( load_driver("GLESv2", cnx, GLESv2), GLESv2 );
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}
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}
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LOG_ALWAYS_FATAL_IF(!hnd, "couldn't find an OpenGL ES implementation");
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cnx->libGles2 = load_wrapper("/system/lib/libGLESv2.so");
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cnx->libGles1 = load_wrapper("/system/lib/libGLESv1_CM.so");
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LOG_ALWAYS_FATAL_IF(!cnx->libGles2 || !cnx->libGles1,
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"couldn't load system OpenGL ES wrapper libraries");
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return (void*)hnd;
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}
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status_t Loader::close(void* driver)
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{
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driver_t* hnd = (driver_t*)driver;
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delete hnd;
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return NO_ERROR;
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}
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void Loader::init_api(void* dso,
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char const * const * api,
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__eglMustCastToProperFunctionPointerType* curr,
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getProcAddressType getProcAddress)
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{
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const ssize_t SIZE = 256;
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char scrap[SIZE];
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while (*api) {
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char const * name = *api;
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__eglMustCastToProperFunctionPointerType f =
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(__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
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if (f == NULL) {
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// couldn't find the entry-point, use eglGetProcAddress()
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f = getProcAddress(name);
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}
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if (f == NULL) {
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// Try without the OES postfix
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ssize_t index = ssize_t(strlen(name)) - 3;
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if ((index>0 && (index<SIZE-1)) && (!strcmp(name+index, "OES"))) {
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strncpy(scrap, name, index);
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scrap[index] = 0;
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f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
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//ALOGD_IF(f, "found <%s> instead", scrap);
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}
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}
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if (f == NULL) {
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// Try with the OES postfix
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ssize_t index = ssize_t(strlen(name)) - 3;
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if (index>0 && strcmp(name+index, "OES")) {
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snprintf(scrap, SIZE, "%sOES", name);
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f = (__eglMustCastToProperFunctionPointerType)dlsym(dso, scrap);
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//ALOGD_IF(f, "found <%s> instead", scrap);
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}
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}
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if (f == NULL) {
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//ALOGD("%s", name);
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f = (__eglMustCastToProperFunctionPointerType)gl_unimplemented;
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/*
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* GL_EXT_debug_label is special, we always report it as
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* supported, it's handled by GLES_trace. If GLES_trace is not
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* enabled, then these are no-ops.
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*/
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if (!strcmp(name, "glInsertEventMarkerEXT")) {
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f = (__eglMustCastToProperFunctionPointerType)gl_noop;
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} else if (!strcmp(name, "glPushGroupMarkerEXT")) {
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f = (__eglMustCastToProperFunctionPointerType)gl_noop;
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} else if (!strcmp(name, "glPopGroupMarkerEXT")) {
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f = (__eglMustCastToProperFunctionPointerType)gl_noop;
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}
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}
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*curr++ = f;
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api++;
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}
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}
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void *Loader::load_driver(const char* kind,
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egl_connection_t* cnx, uint32_t mask)
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{
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class MatchFile {
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public:
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static String8 find(const char* kind) {
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String8 result;
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String8 pattern;
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pattern.appendFormat("lib%s", kind);
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const char* const searchPaths[] = {
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"/vendor/lib/egl",
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"/system/lib/egl"
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};
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// first, we search for the exact name of the GLES userspace
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// driver in both locations.
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// i.e.:
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// libGLES.so, or:
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// libEGL.so, libGLESv1_CM.so, libGLESv2.so
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for (size_t i=0 ; i<NELEM(searchPaths) ; i++) {
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if (find(result, pattern, searchPaths[i], true)) {
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return result;
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}
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}
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// for compatibility with the old "egl.cfg" naming convention
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// we look for files that match:
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// libGLES_*.so, or:
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// libEGL_*.so, libGLESv1_CM_*.so, libGLESv2_*.so
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pattern.append("_");
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for (size_t i=0 ; i<NELEM(searchPaths) ; i++) {
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if (find(result, pattern, searchPaths[i], false)) {
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return result;
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}
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}
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// we didn't find the driver. gah.
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result.clear();
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return result;
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}
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private:
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static bool find(String8& result,
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const String8& pattern, const char* const search, bool exact) {
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// in the emulator case, we just return the hardcoded name
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// of the software renderer.
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if (checkGlesEmulationStatus() == 0) {
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ALOGD("Emulator without GPU support detected. "
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"Fallback to software renderer.");
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result.setTo("/system/lib/egl/libGLES_android.so");
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return true;
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}
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if (exact) {
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String8 absolutePath;
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absolutePath.appendFormat("%s/%s.so", search, pattern.string());
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if (!access(absolutePath.string(), R_OK)) {
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result = absolutePath;
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return true;
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}
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return false;
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}
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DIR* d = opendir(search);
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if (d != NULL) {
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struct dirent cur;
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struct dirent* e;
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while (readdir_r(d, &cur, &e) == 0 && e) {
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if (e->d_type == DT_DIR) {
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continue;
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}
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if (!strcmp(e->d_name, "libGLES_android.so")) {
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// always skip the software renderer
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continue;
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}
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if (strstr(e->d_name, pattern.string()) == e->d_name) {
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if (!strcmp(e->d_name + strlen(e->d_name) - 3, ".so")) {
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result.clear();
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result.appendFormat("%s/%s", search, e->d_name);
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closedir(d);
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return true;
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}
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}
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}
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closedir(d);
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}
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return false;
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}
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};
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String8 absolutePath = MatchFile::find(kind);
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if (absolutePath.isEmpty()) {
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// this happens often, we don't want to log an error
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return 0;
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}
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const char* const driver_absolute_path = absolutePath.string();
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void* dso = dlopen(driver_absolute_path, RTLD_NOW | RTLD_LOCAL);
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if (dso == 0) {
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const char* err = dlerror();
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ALOGE("load_driver(%s): %s", driver_absolute_path, err?err:"unknown");
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return 0;
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}
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ALOGD("loaded %s", driver_absolute_path);
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if (mask & EGL) {
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getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
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ALOGE_IF(!getProcAddress,
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"can't find eglGetProcAddress() in %s", driver_absolute_path);
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egl_t* egl = &cnx->egl;
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__eglMustCastToProperFunctionPointerType* curr =
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(__eglMustCastToProperFunctionPointerType*)egl;
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char const * const * api = egl_names;
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while (*api) {
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char const * name = *api;
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__eglMustCastToProperFunctionPointerType f =
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(__eglMustCastToProperFunctionPointerType)dlsym(dso, name);
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if (f == NULL) {
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// couldn't find the entry-point, use eglGetProcAddress()
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f = getProcAddress(name);
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if (f == NULL) {
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f = (__eglMustCastToProperFunctionPointerType)0;
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}
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}
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*curr++ = f;
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api++;
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}
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}
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if (mask & GLESv1_CM) {
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init_api(dso, gl_names,
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(__eglMustCastToProperFunctionPointerType*)
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&cnx->hooks[egl_connection_t::GLESv1_INDEX]->gl,
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getProcAddress);
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}
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if (mask & GLESv2) {
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init_api(dso, gl_names,
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(__eglMustCastToProperFunctionPointerType*)
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&cnx->hooks[egl_connection_t::GLESv2_INDEX]->gl,
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getProcAddress);
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}
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return dso;
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}
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// ----------------------------------------------------------------------------
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}; // namespace android
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// ----------------------------------------------------------------------------
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