e6f43ddce7
See https://android-git.corp.google.com/g/#/c/157220 Bug: 5449033 Change-Id: Ic9c19d30693bd56755f55906127cd6bd7126096c
333 lines
9.6 KiB
C++
333 lines
9.6 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 <cutils/log.h>
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#include <cutils/properties.h>
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#include <EGL/egl.h>
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#include "egldefs.h"
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#include "glestrace.h"
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#include "hooks.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 drivers are called
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*
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* /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.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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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::entry_t::entry_t(int dpy, int impl, const char* tag)
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: dpy(dpy), impl(impl), tag(tag) {
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}
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// ----------------------------------------------------------------------------
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Loader::Loader()
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{
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char line[256];
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char tag[256];
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/* Special case for GLES emulation */
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if (checkGlesEmulationStatus() == 0) {
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ALOGD("Emulator without GPU support detected. Fallback to software renderer.");
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gConfig.add( entry_t(0, 0, "android") );
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return;
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}
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/* Otherwise, use egl.cfg */
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FILE* cfg = fopen("/system/lib/egl/egl.cfg", "r");
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if (cfg == NULL) {
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// default config
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ALOGD("egl.cfg not found, using default config");
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gConfig.add( entry_t(0, 0, "android") );
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} else {
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while (fgets(line, 256, cfg)) {
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int dpy;
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int impl;
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if (sscanf(line, "%u %u %s", &dpy, &impl, tag) == 3) {
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//ALOGD(">>> %u %u %s", dpy, impl, tag);
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gConfig.add( entry_t(dpy, impl, tag) );
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}
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}
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fclose(cfg);
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}
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}
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Loader::~Loader()
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{
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GLTrace_stop();
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}
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const char* Loader::getTag(int dpy, int impl)
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{
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const Vector<entry_t>& cfgs(gConfig);
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const size_t c = cfgs.size();
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for (size_t i=0 ; i<c ; i++) {
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if (dpy == cfgs[i].dpy)
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if (impl == cfgs[i].impl)
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return cfgs[i].tag.string();
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}
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return 0;
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}
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void* Loader::open(EGLNativeDisplayType display, int impl, egl_connection_t* cnx)
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{
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/*
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* TODO: if we don't find display/0, then use 0/0
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* (0/0 should always work)
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*/
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void* dso;
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int index = int(display);
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driver_t* hnd = 0;
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char const* tag = getTag(index, impl);
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if (tag) {
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dso = load_driver("GLES", tag, 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", tag, cnx, EGL);
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if (dso) {
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hnd = new driver_t(dso);
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// TODO: make this more automated
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hnd->set( load_driver("GLESv1_CM", tag, cnx, GLESv1_CM), GLESv1_CM );
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hnd->set( load_driver("GLESv2", tag, cnx, GLESv2), GLESv2 );
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}
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}
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}
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LOG_FATAL_IF(!index && !impl && !hnd,
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"couldn't find the default OpenGL ES implementation "
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"for default display");
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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 size_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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*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, const char *tag,
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egl_connection_t* cnx, uint32_t mask)
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{
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char driver_absolute_path[PATH_MAX];
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const char* const search1 = "/vendor/lib/egl/lib%s_%s.so";
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const char* const search2 = "/system/lib/egl/lib%s_%s.so";
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snprintf(driver_absolute_path, PATH_MAX, search1, kind, tag);
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if (access(driver_absolute_path, R_OK)) {
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snprintf(driver_absolute_path, PATH_MAX, search2, kind, tag);
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if (access(driver_absolute_path, R_OK)) {
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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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}
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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[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[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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