jni.cpp

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/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#if defined(__ANDROID__)

// Allow use of stuff in <time.h> and abort()
#define FORBIDDEN_SYMBOL_EXCEPTION_time_h
#define FORBIDDEN_SYMBOL_EXCEPTION_abort

// Disable printf override in common/forbidden.h to avoid
// clashes with log.h from the Android SDK.
// That header file uses
//   __attribute__ ((format(printf, 3, 4)))
// which gets messed up by our override mechanism; this could
// be avoided by either changing the Android SDK to use the equally
// legal and valid
//   __attribute__ ((format(printf, 3, 4)))
// or by refining our printf override to use a varadic macro
// (which then wouldn't be portable, though).
// Anyway, for now we just disable the printf override globally
// for the Android port
#define FORBIDDEN_SYMBOL_EXCEPTION_printf

#include "base/main.h"
#include "base/version.h"
#include "common/config-manager.h"
#include "common/error.h"
#include "common/textconsole.h"
#include "engines/engine.h"

#include "backends/platform/android/android.h"
#include "backends/platform/android/asset-archive.h"
#include "backends/platform/android/jni.h"

__attribute__ ((visibility("default")))
jint JNICALL JNI_OnLoad(JavaVM *vm, void *) {
    return JNI::onLoad(vm);
}

JavaVM *JNI::_vm = 0;
jobject JNI::_jobj = 0;
jobject JNI::_jobj_audio_track = 0;
jobject JNI::_jobj_egl = 0;
jobject JNI::_jobj_egl_display = 0;
jobject JNI::_jobj_egl_surface = 0;

Common::Archive *JNI::_asset_archive = 0;
OSystem_Android *JNI::_system = 0;

bool JNI::pause = false;
sem_t JNI::pause_sem = { 0 };

int JNI::surface_changeid = 0;
int JNI::egl_surface_width = 0;
int JNI::egl_surface_height = 0;
bool JNI::_ready_for_events = 0;

jmethodID JNI::_MID_getDPI = 0;
jmethodID JNI::_MID_displayMessageOnOSD = 0;
jmethodID JNI::_MID_openUrl = 0;
jmethodID JNI::_MID_isConnectionLimited = 0;
jmethodID JNI::_MID_setWindowCaption = 0;
jmethodID JNI::_MID_showVirtualKeyboard = 0;
jmethodID JNI::_MID_getSysArchives = 0;
jmethodID JNI::_MID_initSurface = 0;
jmethodID JNI::_MID_deinitSurface = 0;

jmethodID JNI::_MID_EGL10_eglSwapBuffers = 0;

jmethodID JNI::_MID_AudioTrack_flush = 0;
jmethodID JNI::_MID_AudioTrack_pause = 0;
jmethodID JNI::_MID_AudioTrack_play = 0;
jmethodID JNI::_MID_AudioTrack_stop = 0;
jmethodID JNI::_MID_AudioTrack_write = 0;

const JNINativeMethod JNI::_natives[] = {
    { "create", "(Landroid/content/res/AssetManager;"
                "Ljavax/microedition/khronos/egl/EGL10;"
                "Ljavax/microedition/khronos/egl/EGLDisplay;"
                "Landroid/media/AudioTrack;II)V",
        (void *)JNI::create },
    { "destroy", "()V",
        (void *)JNI::destroy },
    { "setSurface", "(II)V",
        (void *)JNI::setSurface },
    { "main", "([Ljava/lang/String;)I",
        (void *)JNI::main },
    { "pushEvent", "(IIIIIII)V",
        (void *)JNI::pushEvent },
    { "enableZoning", "(Z)V",
        (void *)JNI::enableZoning },
    { "setPause", "(Z)V",
        (void *)JNI::setPause }
};

JNI::JNI() {
}

JNI::~JNI() {
}

jint JNI::onLoad(JavaVM *vm) {
    _vm = vm;

    JNIEnv *env;

    if (_vm->GetEnv((void **)&env, JNI_VERSION_1_2))
        return JNI_ERR;

    jclass cls = env->FindClass("org/residualvm/residualvm/ResidualVM");
    if (cls == 0)
        return JNI_ERR;

    if (env->RegisterNatives(cls, _natives, ARRAYSIZE(_natives)) < 0)
        return JNI_ERR;

    return JNI_VERSION_1_2;
}

JNIEnv *JNI::getEnv() {
    JNIEnv *env = 0;

    jint res = _vm->GetEnv((void **)&env, JNI_VERSION_1_2);

    if (res != JNI_OK) {
        LOGE("GetEnv() failed: %d", res);
        abort();
    }

    return env;
}

void JNI::attachThread() {
    JNIEnv *env = 0;

    jint res = _vm->AttachCurrentThread(&env, 0);

    if (res != JNI_OK) {
        LOGE("AttachCurrentThread() failed: %d", res);
        abort();
    }
}

void JNI::detachThread() {
    jint res = _vm->DetachCurrentThread();

    if (res != JNI_OK) {
        LOGE("DetachCurrentThread() failed: %d", res);
        abort();
    }
}

void JNI::setReadyForEvents(bool ready) {
    _ready_for_events = ready;
}

void JNI::throwByName(JNIEnv *env, const char *name, const char *msg) {
    jclass cls = env->FindClass(name);

    // if cls is 0, an exception has already been thrown
    if (cls != 0)
        env->ThrowNew(cls, msg);

    env->DeleteLocalRef(cls);
}

void JNI::throwRuntimeException(JNIEnv *env, const char *msg) {
    throwByName(env, "java/lang/RuntimeException", msg);
}

// calls to the dark side

void JNI::getDPI(float *values) {
    values[0] = 0.0;
    values[1] = 0.0;

    JNIEnv *env = JNI::getEnv();

    jfloatArray array = env->NewFloatArray(2);

    env->CallVoidMethod(_jobj, _MID_getDPI, array);

    if (env->ExceptionCheck()) {
        LOGE("Failed to get DPIs");

        env->ExceptionDescribe();
        env->ExceptionClear();
    } else {
        jfloat *res = env->GetFloatArrayElements(array, 0);

        if (res) {
            values[0] = res[0];
            values[1] = res[1];

            env->ReleaseFloatArrayElements(array, res, 0);
        }
    }

    env->DeleteLocalRef(array);
}

void JNI::displayMessageOnOSD(const char *msg) {
    JNIEnv *env = JNI::getEnv();
    jstring java_msg = env->NewStringUTF(msg);

    env->CallVoidMethod(_jobj, _MID_displayMessageOnOSD, java_msg);

    if (env->ExceptionCheck()) {
        LOGE("Failed to display OSD message");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    env->DeleteLocalRef(java_msg);
}

bool JNI::openUrl(const char *url) {
    bool success = true;
    JNIEnv *env = JNI::getEnv();
    jstring javaUrl = env->NewStringUTF(url);

    env->CallVoidMethod(_jobj, _MID_openUrl, javaUrl);

    if (env->ExceptionCheck()) {
        LOGE("Failed to open URL");

        env->ExceptionDescribe();
        env->ExceptionClear();
        success = false;
    }

    env->DeleteLocalRef(javaUrl);
    return success;
}

bool JNI::isConnectionLimited() {
    bool limited = false;
    JNIEnv *env = JNI::getEnv();
    limited = env->CallBooleanMethod(_jobj, _MID_isConnectionLimited);

    if (env->ExceptionCheck()) {
        LOGE("Failed to check whether connection's limited");

        env->ExceptionDescribe();
        env->ExceptionClear();
        limited = true;
    }

    return limited;
}

void JNI::setWindowCaption(const char *caption) {
    JNIEnv *env = JNI::getEnv();
    jstring java_caption = env->NewStringUTF(caption);

    env->CallVoidMethod(_jobj, _MID_setWindowCaption, java_caption);

    if (env->ExceptionCheck()) {
        LOGE("Failed to set window caption");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    env->DeleteLocalRef(java_caption);
}

void JNI::showVirtualKeyboard(bool enable) {
    JNIEnv *env = JNI::getEnv();

    env->CallVoidMethod(_jobj, _MID_showVirtualKeyboard, enable);

    if (env->ExceptionCheck()) {
        LOGE("Error trying to show virtual keyboard");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }
}

void JNI::addSysArchivesToSearchSet(Common::SearchSet &s, int priority) {
    JNIEnv *env = JNI::getEnv();

    s.add("ASSET", _asset_archive, priority, false);

    jobjectArray array =
        (jobjectArray)env->CallObjectMethod(_jobj, _MID_getSysArchives);

    if (env->ExceptionCheck()) {
        LOGE("Error finding system archive path");

        env->ExceptionDescribe();
        env->ExceptionClear();

        return;
    }

    jsize size = env->GetArrayLength(array);
    for (jsize i = 0; i < size; ++i) {
        jstring path_obj = (jstring)env->GetObjectArrayElement(array, i);
        const char *path = env->GetStringUTFChars(path_obj, 0);

        if (path != 0) {
            s.addDirectory(path, path, priority);
            env->ReleaseStringUTFChars(path_obj, path);
        }

        env->DeleteLocalRef(path_obj);
    }
}

bool JNI::initSurface() {
    JNIEnv *env = JNI::getEnv();

    jobject obj = env->CallObjectMethod(_jobj, _MID_initSurface);

    if (!obj || env->ExceptionCheck()) {
        LOGE("initSurface failed");

        env->ExceptionDescribe();
        env->ExceptionClear();

        return false;
    }

    _jobj_egl_surface = env->NewGlobalRef(obj);

    return true;
}

void JNI::deinitSurface() {
    JNIEnv *env = JNI::getEnv();

    env->CallVoidMethod(_jobj, _MID_deinitSurface);

    if (env->ExceptionCheck()) {
        LOGE("deinitSurface failed");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    env->DeleteGlobalRef(_jobj_egl_surface);
    _jobj_egl_surface = 0;
}

void JNI::setAudioPause() {
    JNIEnv *env = JNI::getEnv();

    env->CallVoidMethod(_jobj_audio_track, _MID_AudioTrack_flush);

    if (env->ExceptionCheck()) {
        LOGE("Error flushing AudioTrack");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }

    env->CallVoidMethod(_jobj_audio_track, _MID_AudioTrack_pause);

    if (env->ExceptionCheck()) {
        LOGE("Error setting AudioTrack: pause");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }
}

void JNI::setAudioPlay() {
    JNIEnv *env = JNI::getEnv();

    env->CallVoidMethod(_jobj_audio_track, _MID_AudioTrack_play);

    if (env->ExceptionCheck()) {
        LOGE("Error setting AudioTrack: play");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }
}

void JNI::setAudioStop() {
    JNIEnv *env = JNI::getEnv();

    env->CallVoidMethod(_jobj_audio_track, _MID_AudioTrack_stop);

    if (env->ExceptionCheck()) {
        LOGE("Error setting AudioTrack: stop");

        env->ExceptionDescribe();
        env->ExceptionClear();
    }
}

// natives for the dark side

void JNI::create(JNIEnv *env, jobject self, jobject asset_manager,
                jobject egl, jobject egl_display,
                jobject at, jint audio_sample_rate, jint audio_buffer_size) {
    LOGI(gScummVMFullVersion);

    assert(!_system);

    pause = false;
    // initial value of zero!
    sem_init(&pause_sem, 0, 0);

    _asset_archive = new AndroidAssetArchive(asset_manager);
    assert(_asset_archive);

    _system = new OSystem_Android(audio_sample_rate, audio_buffer_size);
    assert(_system);

    // weak global ref to allow class to be unloaded
    // ... except dalvik implements NewWeakGlobalRef only on froyo
    //_jobj = env->NewWeakGlobalRef(self);

    _jobj = env->NewGlobalRef(self);

    jclass cls = env->GetObjectClass(_jobj);

#define FIND_METHOD(prefix, name, signature) do {                           \
        _MID_ ## prefix ## name = env->GetMethodID(cls, #name, signature);  \
        if (_MID_ ## prefix ## name == 0)                                   \
            return;                                                         \
    } while (0)

    FIND_METHOD(, setWindowCaption, "(Ljava/lang/String;)V");
    FIND_METHOD(, getDPI, "([F)V");
    FIND_METHOD(, displayMessageOnOSD, "(Ljava/lang/String;)V");
    FIND_METHOD(, openUrl, "(Ljava/lang/String;)V");
    FIND_METHOD(, isConnectionLimited, "()Z");
    FIND_METHOD(, showVirtualKeyboard, "(Z)V");
    FIND_METHOD(, getSysArchives, "()[Ljava/lang/String;");
    FIND_METHOD(, initSurface, "()Ljavax/microedition/khronos/egl/EGLSurface;");
    FIND_METHOD(, deinitSurface, "()V");

    _jobj_egl = env->NewGlobalRef(egl);
    _jobj_egl_display = env->NewGlobalRef(egl_display);

    cls = env->GetObjectClass(_jobj_egl);

    FIND_METHOD(EGL10_, eglSwapBuffers,
                "(Ljavax/microedition/khronos/egl/EGLDisplay;"
                "Ljavax/microedition/khronos/egl/EGLSurface;)Z");

    _jobj_audio_track = env->NewGlobalRef(at);

    cls = env->GetObjectClass(_jobj_audio_track);

    FIND_METHOD(AudioTrack_, flush, "()V");
    FIND_METHOD(AudioTrack_, pause, "()V");
    FIND_METHOD(AudioTrack_, play, "()V");
    FIND_METHOD(AudioTrack_, stop, "()V");
    FIND_METHOD(AudioTrack_, write, "([BII)I");

#undef FIND_METHOD

    g_system = _system;
}

void JNI::destroy(JNIEnv *env, jobject self) {
    delete _asset_archive;
    _asset_archive = 0;

    delete _system;
    g_system = 0;
    _system = 0;

    sem_destroy(&pause_sem);

    // see above
    //JNI::getEnv()->DeleteWeakGlobalRef(_jobj);

    JNI::getEnv()->DeleteGlobalRef(_jobj_egl_display);
    JNI::getEnv()->DeleteGlobalRef(_jobj_egl);
    JNI::getEnv()->DeleteGlobalRef(_jobj_audio_track);
    JNI::getEnv()->DeleteGlobalRef(_jobj);
}

void JNI::setSurface(JNIEnv *env, jobject self, jint width, jint height) {
    egl_surface_width = width;
    egl_surface_height = height;
    surface_changeid++;
}

jint JNI::main(JNIEnv *env, jobject self, jobjectArray args) {
    assert(_system);

    const int MAX_NARGS = 32;
    int res = -1;

    int argc = env->GetArrayLength(args);
    if (argc > MAX_NARGS) {
        throwByName(env, "java/lang/IllegalArgumentException",
                    "too many arguments");
        return 0;
    }

    char *argv[MAX_NARGS];

    // note use in cleanup loop below
    int nargs;

    for (nargs = 0; nargs < argc; ++nargs) {
        jstring arg = (jstring)env->GetObjectArrayElement(args, nargs);

        if (arg == 0) {
            argv[nargs] = 0;
        } else {
            const char *cstr = env->GetStringUTFChars(arg, 0);

            argv[nargs] = const_cast<char *>(cstr);

            // exception already thrown?
            if (cstr == 0)
                goto cleanup;
        }

        env->DeleteLocalRef(arg);
    }

    LOGI("Entering scummvm_main with %d args", argc);

    res = scummvm_main(argc, argv);

    LOGI("scummvm_main exited with code %d", res);

    _system->quit();

cleanup:
    nargs--;

    for (int i = 0; i < nargs; ++i) {
        if (argv[i] == 0)
            continue;

        jstring arg = (jstring)env->GetObjectArrayElement(args, nargs);

        // Exception already thrown?
        if (arg == 0)
            return res;

        env->ReleaseStringUTFChars(arg, argv[i]);
        env->DeleteLocalRef(arg);
    }

    return res;
}

void JNI::pushEvent(JNIEnv *env, jobject self, int type, int arg1, int arg2,
                    int arg3, int arg4, int arg5, int arg6) {
    // drop events until we're ready and after we quit
    if (!_ready_for_events) {
        LOGW("dropping event");
        return;
    }

    assert(_system);

    _system->pushEvent(type, arg1, arg2, arg3, arg4, arg5, arg6);
}

void JNI::enableZoning(JNIEnv *env, jobject self, jboolean enable) {
    assert(_system);

    _system->enableZoning(enable);
}

void JNI::setPause(JNIEnv *env, jobject self, jboolean value) {
    if (!_system)
        return;

    if (g_engine) {
        LOGD("pauseEngine: %d", value);

        g_engine->pauseEngine(value);

        if (value &&
                g_engine->hasFeature(Engine::kSupportsSavingDuringRuntime) &&
                g_engine->canSaveGameStateCurrently())
            g_engine->saveGameState(0, "Android parachute");
    }

    pause = value;

    if (!pause) {
        // wake up all threads
        for (uint i = 0; i < 3; ++i)
            sem_post(&pause_sem);
    }
}

#endif