implement a real loader for EGL drivers
we now look for a config file in /system/lib/egl/egl.cfg that describes the association of a display to a driver.
these drivers are named: /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$TAG.so
diff --git a/opengl/libs/EGL/Loader.cpp b/opengl/libs/EGL/Loader.cpp
new file mode 100644
index 0000000..0e0f2c2
--- /dev/null
+++ b/opengl/libs/EGL/Loader.cpp
@@ -0,0 +1,278 @@
+/*
+ ** Copyright 2007, The Android Open Source Project
+ **
+ ** Licensed under the Apache License, Version 2.0 (the "License");
+ ** you may not use this file except in compliance with the License.
+ ** You may obtain a copy of the License at
+ **
+ ** http://www.apache.org/licenses/LICENSE-2.0
+ **
+ ** Unless required by applicable law or agreed to in writing, software
+ ** distributed under the License is distributed on an "AS IS" BASIS,
+ ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ ** See the License for the specific language governing permissions and
+ ** limitations under the License.
+ */
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <dlfcn.h>
+#include <limits.h>
+
+#include <cutils/log.h>
+
+#include <EGL/egl.h>
+
+#include "hooks.h"
+#include "egl_impl.h"
+
+#include "Loader.h"
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+
+/*
+ * EGL drivers are called
+ *
+ * /system/lib/egl/lib{[EGL|GLESv1_CM|GLESv2] | GLES}_$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, gl_hooks_t* hooks)
+{
+ /*
+ * 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 = "egl/lib%s_%s.so";
+
+ char const* tag = getTag(index, impl);
+ if (tag) {
+ snprintf(path, PATH_MAX, format, "GLES", tag);
+ dso = load_driver(path, hooks, EGL | GLESv1_CM | GLESv2);
+ if (dso) {
+ hnd = new driver_t(dso);
+ } else {
+ // Always load EGL first
+ snprintf(path, PATH_MAX, "lib%s_%s.so", "EGL", tag);
+ dso = load_driver(path, hooks, 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, hooks, GLESv1_CM), GLESv1_CM );
+
+ snprintf(path, PATH_MAX, format, "GLESv2", tag);
+ hnd->set( load_driver(path, hooks, GLESv2), GLESv2 );
+ }
+ }
+ }
+
+ LOG_FATAL_IF(!index && !impl && !hnd,
+ "couldn't'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, gl_hooks_t* hooks, uint32_t mask)
+{
+ //LOGD("%s", driver);
+ void* dso = dlopen(driver, RTLD_NOW | RTLD_LOCAL);
+ LOGE_IF(!dso,
+ "couldn't load <%s> library (%s)",
+ driver, dlerror());
+ if (dso == 0)
+ return 0;
+
+ if (mask & EGL) {
+ getProcAddress = (getProcAddressType)dlsym(dso, "eglGetProcAddress");
+
+ LOGE_IF(!getProcAddress,
+ "can't find eglGetProcAddress() in %s", driver);
+
+ gl_hooks_t::egl_t* egl = &hooks->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*)&hooks->gl,
+ getProcAddress);
+ }
+
+ if (mask & GLESv2) {
+ init_api(dso, gl2_names,
+ (__eglMustCastToProperFunctionPointerType*)&hooks->gl2,
+ getProcAddress);
+ }
+
+ return dso;
+}
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------