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////////////////////////////////////////////////////////////
//
// SFML - Simple and Fast Multimedia Library
// Copyright (C) 2013 Jonathan De Wachter (dewachter.jonathan@gmail.com)
//
// This software is provided 'as-is', without any express or implied warranty.
// In no event will the authors be held liable for any damages arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it freely,
// subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented;
// you must not claim that you wrote the original software.
// If you use this software in a product, an acknowledgment
// in the product documentation would be appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such,
// and must not be misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
////////////////////////////////////////////////////////////
#include <SFML/Config.hpp>
#include <android/native_activity.h>
#include <android/log.h>
#include <dlfcn.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <jni.h>
#include <string>
#define LOGE(...) ((void)__android_log_print(ANDROID_LOG_INFO, "sfml-activity", __VA_ARGS__))
namespace {
typedef void (*activityOnCreatePointer)(ANativeActivity*, void*, size_t);
}
const char *getLibraryName(JNIEnv* lJNIEnv, jobject& objectActivityInfo)
{
// This function reads the value of meta-data "sfml.app.lib_name"
// found in the Android Manifest file and returns it. It performs the
// following Java code using the JNI interface:
//
// ai.metaData.getString("sfml.app.lib_name");
static char name[256];
// Get metaData instance from the ActivityInfo object
jclass classActivityInfo = lJNIEnv->FindClass("android/content/pm/ActivityInfo");
jfieldID fieldMetaData = lJNIEnv->GetFieldID(classActivityInfo, "metaData", "Landroid/os/Bundle;");
jobject objectMetaData = lJNIEnv->GetObjectField(objectActivityInfo, fieldMetaData);
// Create a java string object containing "sfml.app.lib_name"
jobject objectName = lJNIEnv->NewStringUTF("sfml.app.lib_name");
// Get the value of meta-data named "sfml.app.lib_name"
jclass classBundle = lJNIEnv->FindClass("android/os/Bundle");
jmethodID methodGetString = lJNIEnv->GetMethodID(classBundle, "getString", "(Ljava/lang/String;)Ljava/lang/String;");
jstring valueString = (jstring)lJNIEnv->CallObjectMethod(objectMetaData, methodGetString, objectName);
// No meta-data "sfml.app.lib_name" was found so we abort and inform the user
if (valueString == NULL)
{
LOGE("No meta-data 'sfml.app.lib_name' found in AndroidManifest.xml file");
exit(1);
}
// Convert the application name to a C++ string and return it
const size_t applicationNameLength = static_cast<size_t>(lJNIEnv->GetStringUTFLength(valueString));
const char* applicationName = lJNIEnv->GetStringUTFChars(valueString, NULL);
if (applicationNameLength >= 256)
{
LOGE("The value of 'sfml.app.lib_name' must not be longer than 255 characters.");
exit(1);
}
strncpy(name, applicationName, static_cast<size_t>(applicationNameLength));
name[applicationNameLength] = '\0';
lJNIEnv->ReleaseStringUTFChars(valueString, applicationName);
return name;
}
void* loadLibrary(const char* libraryName, JNIEnv* lJNIEnv, jobject& ObjectActivityInfo)
{
// Find out the absolute path of the library
jclass ClassActivityInfo = lJNIEnv->FindClass("android/content/pm/ActivityInfo");
jfieldID FieldApplicationInfo = lJNIEnv->GetFieldID(ClassActivityInfo, "applicationInfo", "Landroid/content/pm/ApplicationInfo;");
jobject ObjectApplicationInfo = lJNIEnv->GetObjectField(ObjectActivityInfo, FieldApplicationInfo);
jclass ClassApplicationInfo = lJNIEnv->FindClass("android/content/pm/ApplicationInfo");
jfieldID FieldNativeLibraryDir = lJNIEnv->GetFieldID(ClassApplicationInfo, "nativeLibraryDir", "Ljava/lang/String;");
jobject ObjectDirPath = lJNIEnv->GetObjectField(ObjectApplicationInfo, FieldNativeLibraryDir);
jclass ClassSystem = lJNIEnv->FindClass("java/lang/System");
jmethodID StaticMethodMapLibraryName = lJNIEnv->GetStaticMethodID(ClassSystem, "mapLibraryName", "(Ljava/lang/String;)Ljava/lang/String;");
jstring LibNameObject = lJNIEnv->NewStringUTF(libraryName);
jobject ObjectName = lJNIEnv->CallStaticObjectMethod(ClassSystem, StaticMethodMapLibraryName, LibNameObject);
jclass ClassFile = lJNIEnv->FindClass("java/io/File");
jmethodID FileConstructor = lJNIEnv->GetMethodID(ClassFile, "<init>", "(Ljava/lang/String;Ljava/lang/String;)V");
jobject ObjectFile = lJNIEnv->NewObject(ClassFile, FileConstructor, ObjectDirPath, ObjectName);
// Get the library absolute path and convert it
jmethodID MethodGetPath = lJNIEnv->GetMethodID(ClassFile, "getPath", "()Ljava/lang/String;");
jstring javaLibraryPath = static_cast<jstring>(lJNIEnv->CallObjectMethod(ObjectFile, MethodGetPath));
const char* libraryPath = lJNIEnv->GetStringUTFChars(javaLibraryPath, NULL);
// Manually load the library
void * handle = dlopen(libraryPath, RTLD_NOW | RTLD_GLOBAL);
if (!handle)
{
LOGE("dlopen(\"%s\"): %s", libraryPath, dlerror());
exit(1);
}
// Release the Java string
lJNIEnv->ReleaseStringUTFChars(javaLibraryPath, libraryPath);
return handle;
}
void ANativeActivity_onCreate(ANativeActivity* activity, void* savedState, size_t savedStateSize)
{
// Before we can load a library, we need to find out its location. As
// we're powerless here in C/C++, we need the JNI interface to communicate
// with the attached Java virtual machine and perform some Java calls in
// order to retrieve the absolute path of our libraries.
//
// Here's the snippet of Java code it performs:
// --------------------------------------------
// ai = getPackageManager().getActivityInfo(getIntent().getComponent(), PackageManager.GET_META_DATA);
// File libraryFile = new File(ai.applicationInfo.nativeLibraryDir, System.mapLibraryName(libname));
// String path = libraryFile.getPath();
//
// With libname being the library name such as "jpeg".
// Retrieve JNI environment and JVM instance
JNIEnv* lJNIEnv = activity->env;
// Retrieve the NativeActivity
jobject ObjectNativeActivity = activity->clazz;
jclass ClassNativeActivity = lJNIEnv->GetObjectClass(ObjectNativeActivity);
// Retrieve the ActivityInfo
jmethodID MethodGetPackageManager = lJNIEnv->GetMethodID(ClassNativeActivity, "getPackageManager", "()Landroid/content/pm/PackageManager;");
jobject ObjectPackageManager = lJNIEnv->CallObjectMethod(ObjectNativeActivity, MethodGetPackageManager);
jmethodID MethodGetIndent = lJNIEnv->GetMethodID(ClassNativeActivity, "getIntent", "()Landroid/content/Intent;");
jobject ObjectIntent = lJNIEnv->CallObjectMethod(ObjectNativeActivity, MethodGetIndent);
jclass ClassIntent = lJNIEnv->FindClass("android/content/Intent");
jmethodID MethodGetComponent = lJNIEnv->GetMethodID(ClassIntent, "getComponent", "()Landroid/content/ComponentName;");
jobject ObjectComponentName = lJNIEnv->CallObjectMethod(ObjectIntent, MethodGetComponent);
jclass ClassPackageManager = lJNIEnv->FindClass("android/content/pm/PackageManager");
jfieldID FieldGET_META_DATA = lJNIEnv->GetStaticFieldID(ClassPackageManager, "GET_META_DATA", "I");
jint GET_META_DATA = lJNIEnv->GetStaticIntField(ClassPackageManager, FieldGET_META_DATA);
jmethodID MethodGetActivityInfo = lJNIEnv->GetMethodID(ClassPackageManager, "getActivityInfo", "(Landroid/content/ComponentName;I)Landroid/content/pm/ActivityInfo;");
jobject ObjectActivityInfo = lJNIEnv->CallObjectMethod(ObjectPackageManager, MethodGetActivityInfo, ObjectComponentName, GET_META_DATA);
// Load our libraries in reverse order
#if defined(STL_LIBRARY)
#define _SFML_QS(s) _SFML_S(s)
#define _SFML_S(s) #s
loadLibrary(_SFML_QS(STL_LIBRARY), lJNIEnv, ObjectActivityInfo);
#undef _SFML_S
#undef _SFML_QS
#endif
loadLibrary("openal", lJNIEnv, ObjectActivityInfo);
#if !defined(SFML_DEBUG)
loadLibrary("sfml-system", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-window", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-graphics", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-audio", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-network", lJNIEnv, ObjectActivityInfo);
#else
loadLibrary("sfml-system-d", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-window-d", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-graphics-d", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-audio-d", lJNIEnv, ObjectActivityInfo);
loadLibrary("sfml-network-d", lJNIEnv, ObjectActivityInfo);
#endif
void* handle = loadLibrary(getLibraryName(lJNIEnv, ObjectActivityInfo), lJNIEnv, ObjectActivityInfo);
// Call the original ANativeActivity_onCreate function
activityOnCreatePointer ANativeActivity_onCreate = (activityOnCreatePointer)dlsym(handle, "ANativeActivity_onCreate");
if (!ANativeActivity_onCreate)
{
LOGE("sfml-activity: Undefined symbol ANativeActivity_onCreate");
exit(1);
}
ANativeActivity_onCreate(activity, savedState, savedStateSize);
}
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