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https://github.com/SFML/SFML.git
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[Android] Wrote a native activity acting as a bootstrap
A current limitation prevents one library from depending on shared libraries. As we have legal issues here (LGPL wants us to use shared libs of OpenAL-Soft and libsndfile), we're forced to use this homemade native activity which will manually load our shared libraries.
This commit is contained in:
Jonathan De Wachter
parent
60894d1c1a
commit
cc0d982f72
@ -88,6 +88,11 @@ if(ANDROID)
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# we install libs in a subdirectory named after the ABI (lib/mips/*.so)
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set(LIB_SUFFIX "/${ANDROID_ABI}")
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# this is a workaround to compile sfml-activity without stlport_shared as dependency
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# we save the original compilation command line to restore it later in Macro.cmake
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set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STLPORT ${CMAKE_CXX_CREATE_SHARED_LIBRARY})
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set(CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STLPORT "<CMAKE_CXX_COMPILER> <CMAKE_SHARED_LIBRARY_CXX_FLAGS> <LANGUAGE_COMPILE_FLAGS> <LINK_FLAGS> <CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS> <SONAME_FLAG><TARGET_SONAME> -o <TARGET> <OBJECTS> <LINK_LIBRARIES>")
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endif()
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# define SFML_STATIC if the build type is not set to 'shared'
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@ -97,6 +97,18 @@ macro(sfml_add_library target)
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set_target_properties(${target} PROPERTIES XCODE_ATTRIBUTE_CLANG_ENABLE_OBJC_ARC YES)
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endif()
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# sfml-activity library is our bootstrap activity and must not depend on stlport_shared
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# (otherwise Android will fail to load it)
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if (ANDROID)
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if (${target} MATCHES "sfml-activity")
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set_target_properties(${target} PROPERTIES COMPILE_FLAGS -fpermissive)
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set_target_properties(${target} PROPERTIES LINK_FLAGS "-landroid -llog")
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set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITHOUT_STLPORT})
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else()
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set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_CXX_CREATE_SHARED_LIBRARY_WITH_STLPORT})
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endif()
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endif()
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# link the target to its external dependencies
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if(THIS_EXTERNAL_LIBS)
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target_link_libraries(${target} ${THIS_EXTERNAL_LIBS})
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@ -16,32 +16,24 @@ include $(CLEAR_VARS)
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LOCAL_MODULE := ogg
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libogg.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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include $(CLEAR_VARS)
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LOCAL_MODULE := flac
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libFLAC.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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include $(CLEAR_VARS)
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LOCAL_MODULE := vorbis
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libvorbis.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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include $(CLEAR_VARS)
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LOCAL_MODULE := vorbisenc
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libvorbisenc.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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include $(CLEAR_VARS)
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@ -49,8 +41,6 @@ LOCAL_MODULE := sndfile
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libsndfile.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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LOCAL_SHARED_LIBRARIES := ogg flac vorbis vorbisenc
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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include $(CLEAR_VARS)
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@ -58,6 +48,4 @@ LOCAL_MODULE := openal
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libopenal.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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LOCAL_SHARED_LIBRARIES := ogg flac vorbis vorbisenc
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TARGET_ARCH_ABI := armeabi armeabi-v7a x86
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include $(PREBUILT_SHARED_LIBRARY)
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@ -55,4 +55,11 @@ LOCAL_SHARED_LIBRARIES := sfml-system sfml-window
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include $(PREBUILT_STATIC_LIBRARY)
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include $(CLEAR_VARS)
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LOCAL_MODULE := sfml-activity
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LOCAL_SRC_FILES := lib/$(TARGET_ARCH_ABI)/libsfml-activity.so
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LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
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include $(PREBUILT_SHARED_LIBRARY)
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$(call import-module,sfml/extlibs)
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@ -28,3 +28,10 @@ set_target_properties(sfml-main PROPERTIES FOLDER "SFML")
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# setup the install rule
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install(TARGETS sfml-main ARCHIVE DESTINATION lib${LIB_SUFFIX} COMPONENT devel)
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# because of a current limitation on Android (which prevents one library
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# from depending on shared libraries), we need a boostrap activity which
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# will load our shared libraries manually
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if(ANDROID)
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sfml_add_library(sfml-activity SOURCES ${PROJECT_SOURCE_DIR}/src/SFML/Main/SFMLActivity.cpp)
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endif()
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166
src/SFML/Main/SFMLActivity.cpp
Normal file
166
src/SFML/Main/SFMLActivity.cpp
Normal file
@ -0,0 +1,166 @@
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////////////////////////////////////////////////////////////
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//
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// SFML - Simple and Fast Multimedia Library
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// Copyright (C) 2013 Jonathan De Wachter (dewachter.jonathan@gmail.com)
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//
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// This software is provided 'as-is', without any express or implied warranty.
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// In no event will the authors be held liable for any damages arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it freely,
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// subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented;
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// you must not claim that you wrote the original software.
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// If you use this software in a product, an acknowledgment
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// in the product documentation would be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such,
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// and must not be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source distribution.
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//
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////////////////////////////////////////////////////////////
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#include <android/native_activity.h>
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#include <android/log.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <jni.h>
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#define LOGE(...) ((void)__android_log_print(ANDROID_LOG_INFO, "sfml-activity", __VA_ARGS__))
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void* loadLibrary(const char* libraryName, JNIEnv* lJNIEnv, jobject& ObjectActivityInfo)
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{
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// Find out the absolute path of the library
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jclass ClassActivityInfo = lJNIEnv->FindClass("android/content/pm/ActivityInfo");
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jfieldID FieldApplicationInfo = lJNIEnv->GetFieldID(ClassActivityInfo, "applicationInfo", "Landroid/content/pm/ApplicationInfo;");
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jobject ObjectApplicationInfo = lJNIEnv->GetObjectField(ObjectActivityInfo, FieldApplicationInfo);
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jclass ClassApplicationInfo = lJNIEnv->FindClass("android/content/pm/ApplicationInfo");
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jfieldID FieldNativeLibraryDir = lJNIEnv->GetFieldID(ClassApplicationInfo, "nativeLibraryDir", "Ljava/lang/String;");
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jobject ObjectDirPath = lJNIEnv->GetObjectField(ObjectApplicationInfo, FieldNativeLibraryDir);
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jclass ClassSystem = lJNIEnv->FindClass("java/lang/System");
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jmethodID StaticMethodMapLibraryName = lJNIEnv->GetStaticMethodID(ClassSystem, "mapLibraryName", "(Ljava/lang/String;)Ljava/lang/String;");
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jstring LibNameObject = lJNIEnv->NewStringUTF(libraryName);
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jobject ObjectName = lJNIEnv->CallStaticObjectMethod(ClassSystem, StaticMethodMapLibraryName, LibNameObject);
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jclass ClassFile = lJNIEnv->FindClass("java/io/File");
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jmethodID FileConstructor = lJNIEnv->GetMethodID(ClassFile, "<init>", "(Ljava/lang/String;Ljava/lang/String;)V");
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jobject ObjectFile = lJNIEnv->NewObject(ClassFile, FileConstructor, ObjectDirPath, ObjectName);
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// Get the library absolute path and convert it
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jmethodID MethodGetPath = lJNIEnv->GetMethodID(ClassFile, "getPath", "()Ljava/lang/String;");
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jstring javaLibraryPath = static_cast<jstring>(lJNIEnv->CallObjectMethod(ObjectFile, MethodGetPath));
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const char* libraryPath = lJNIEnv->GetStringUTFChars(javaLibraryPath, NULL);
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// Manually load the library
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void * handle = dlopen(libraryPath, RTLD_NOW | RTLD_GLOBAL);
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if (!handle)
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{
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LOGE("dlopen(\"%s\"): %s", libraryPath, dlerror());
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exit(1);
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}
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// Release the Java string
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lJNIEnv->ReleaseStringUTFChars(THESTRING, pathStr);
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return handle;
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}
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void ANativeActivity_onCreate(ANativeActivity* activity, void* savedState, size_t savedStateSize)
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{
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// Before we can load a library, we need to find out its location. As
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// we're powerless here in C/C++, we need the JNI interface to communicate
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// with the attached Java virtual machine and perform some Java calls in
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// order to retrieve the absolute path of our libraries.
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//
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// Here's the snippet of Java code it performs:
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// --------------------------------------------
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// ai = getPackageManager().getActivityInfo(getIntent().getComponent(), PackageManager.GET_META_DATA);
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// File libraryFile = new File(ai.applicationInfo.nativeLibraryDir, System.mapLibraryName(libname));
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// String path = libraryFile.getPath();
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//
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// With libname being the library name such as "jpeg".
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// Initialize JNI
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jint lResult;
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jint lFlags = 0;
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JavaVM* lJavaVM = activity->vm;
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JNIEnv* lJNIEnv = activity->env;
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JavaVMAttachArgs lJavaVMAttachArgs;
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lJavaVMAttachArgs.version = JNI_VERSION_1_6;
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lJavaVMAttachArgs.name = "NativeThread";
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lJavaVMAttachArgs.group = NULL;
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// Attach the current thread to the JAva virtual machine
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lResult=lJavaVM->AttachCurrentThread(&lJNIEnv, &lJavaVMAttachArgs);
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if (lResult == JNI_ERR) {
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LOG("Couldn't attach the current thread to the Java virtual machine");
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exit(1);
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}
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// Retrieve the NativeActivity
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jobject ObjectNativeActivity = activity->clazz;
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jclass ClassNativeActivity = lJNIEnv->GetObjectClass(ObjectNativeActivity);
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// Retrieve the ActivityInfo
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jmethodID MethodGetPackageManager = lJNIEnv->GetMethodID(ClassNativeActivity, "getPackageManager", "()Landroid/content/pm/PackageManager;");
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jobject ObjectPackageManager = lJNIEnv->CallObjectMethod(ObjectNativeActivity, MethodGetPackageManager);
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jmethodID MethodGetIndent = lJNIEnv->GetMethodID(ClassNativeActivity, "getIntent", "()Landroid/content/Intent;");
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jobject ObjectIntent = lJNIEnv->CallObjectMethod(ObjectNativeActivity, MethodGetIndent);
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jclass ClassIntent = lJNIEnv->FindClass("android/content/Intent");
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jmethodID MethodGetComponent = lJNIEnv->GetMethodID(ClassIntent, "getComponent", "()Landroid/content/ComponentName;");
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jobject ObjectComponentName = lJNIEnv->CallObjectMethod(ObjectIntent, MethodGetComponent);
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jclass ClassPackageManager = lJNIEnv->FindClass("android/content/pm/PackageManager");
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//jfieldID FieldGET_META_DATA = lJNIEnv->GetStaticFieldID(ClassPackageManager, "GET_META_DATA", "L");
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//jobject GET_META_DATA = lJNIEnv->GetStaticObjectField(ClassPackageManager, FieldGET_META_DATA);
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// getActivityInfo(getIntent().getComponent(), PackageManager.GET_META_DATA) -> ActivityInfo object
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jmethodID MethodGetActivityInfo = lJNIEnv->GetMethodID(ClassPackageManager, "getActivityInfo", "(Landroid/content/ComponentName;I)Landroid/content/pm/ActivityInfo;");
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// todo: do not hardcode the GET_META_DATA integer value but retrieve it instead
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jobject ObjectActivityInfo = lJNIEnv->CallObjectMethod(ObjectPackageManager, MethodGetActivityInfo, ObjectComponentName, (jint)128);
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// Load our libraries in reverse order
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loadLibrary("stlport_shared", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sfml-system", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sfml-window", lJNIEnv, ObjectActivityInfo);
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loadLibrary("jpeg", lJNIEnv, ObjectActivityInfo);
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loadLibrary("freetype", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sfml-graphics", lJNIEnv, ObjectActivityInfo);
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loadLibrary("ogg", lJNIEnv, ObjectActivityInfo);
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loadLibrary("FLAC", lJNIEnv, ObjectActivityInfo);
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loadLibrary("vorbis", lJNIEnv, ObjectActivityInfo);
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loadLibrary("vorbisenc", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sndfile", lJNIEnv, ObjectActivityInfo);
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loadLibrary("openal", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sfml-audio", lJNIEnv, ObjectActivityInfo);
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loadLibrary("sfml-network", lJNIEnv, ObjectActivityInfo);
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void* handle = loadLibrary("sfml-example", lJNIEnv, ObjectActivityInfo);
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// todo: should we detach the current thread ? because if we do, it
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// crashes (lJavaVM->DetachCurrentThread();)
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// Call the original ANativeActivity_onCreate function
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void (*ANativeActivity_onCreate)(ANativeActivity*, void*, size_t) = dlsym(handle, "ANativeActivity_onCreate");
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if (!ANativeActivity_onCreate)
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{
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LOGE("sfml-activity: Undefined symbol ANativeActivity_onCreate");
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exit(1);
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}
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ANativeActivity_onCreate(activity, savedState, savedStateSize);
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}
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