godot/platform/android/java_godot_wrapper.cpp

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/*  java_godot_wrapper.cpp                                               */
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/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "java_godot_wrapper.h"

// JNIEnv is only valid within the thread it belongs to, in a multi threading environment
// we can't cache it.
// For Godot we call most access methods from our thread and we thus get a valid JNIEnv
// from ThreadAndroid. For one or two we expect to pass the environment

// TODO we could probably create a base class for this...

GodotJavaWrapper::GodotJavaWrapper(JNIEnv *p_env, jobject p_godot_instance) {
	godot_instance = p_env->NewGlobalRef(p_godot_instance);

	// get info about our Godot class so we can get pointers and stuff...
	cls = p_env->FindClass("org/godotengine/godot/Godot");
	if (cls) {
		cls = (jclass)p_env->NewGlobalRef(cls);
	} else {
		// this is a pretty serious fail.. bail... pointers will stay 0
		return;
	}

	// get some method pointers...
	_on_video_init = p_env->GetMethodID(cls, "onVideoInit", "()V");
	_restart = p_env->GetMethodID(cls, "restart", "()V");
	_finish = p_env->GetMethodID(cls, "forceQuit", "()V");
	_set_keep_screen_on = p_env->GetMethodID(cls, "setKeepScreenOn", "(Z)V");
	_alert = p_env->GetMethodID(cls, "alert", "(Ljava/lang/String;Ljava/lang/String;)V");
	_get_GLES_version_code = p_env->GetMethodID(cls, "getGLESVersionCode", "()I");
	_get_clipboard = p_env->GetMethodID(cls, "getClipboard", "()Ljava/lang/String;");
	_set_clipboard = p_env->GetMethodID(cls, "setClipboard", "(Ljava/lang/String;)V");
	_request_permission = p_env->GetMethodID(cls, "requestPermission", "(Ljava/lang/String;)Z");
}

GodotJavaWrapper::~GodotJavaWrapper() {
	// nothing to do here for now
}

jobject GodotJavaWrapper::get_activity() {
	// our godot instance is our activity
	return godot_instance;
}

jobject GodotJavaWrapper::get_member_object(const char *p_name, const char *p_class, JNIEnv *p_env) {
	if (cls) {
		if (p_env == NULL)
			p_env = ThreadAndroid::get_env();

		jfieldID fid = p_env->GetStaticFieldID(cls, p_name, p_class);
		return p_env->GetStaticObjectField(cls, fid);
	} else {
		return NULL;
	}
}

jobject GodotJavaWrapper::get_class_loader() {
	if (cls) {
		JNIEnv *env = ThreadAndroid::get_env();
		jmethodID getClassLoader = env->GetMethodID(cls, "getClassLoader", "()Ljava/lang/ClassLoader;");
		return env->CallObjectMethod(godot_instance, getClassLoader);
	} else {
		return NULL;
	}
}

void GodotJavaWrapper::gfx_init(bool gl2) {
	// beats me what this once did, there was no code,
	// but we're getting false if our GLES3 driver is initialised
	// and true for our GLES2 driver
	// Maybe we're supposed to communicate this back or store it?
}

void GodotJavaWrapper::on_video_init(JNIEnv *p_env) {
	if (_on_video_init)
		if (p_env == NULL)
			p_env = ThreadAndroid::get_env();

	p_env->CallVoidMethod(godot_instance, _on_video_init);
}

void GodotJavaWrapper::restart(JNIEnv *p_env) {
	if (_restart)
		if (p_env == NULL)
			p_env = ThreadAndroid::get_env();

	p_env->CallVoidMethod(godot_instance, _restart);
}

void GodotJavaWrapper::force_quit(JNIEnv *p_env) {
	if (_finish)
		if (p_env == NULL)
			p_env = ThreadAndroid::get_env();

	p_env->CallVoidMethod(godot_instance, _finish);
}

void GodotJavaWrapper::set_keep_screen_on(bool p_enabled) {
	if (_set_keep_screen_on) {
		JNIEnv *env = ThreadAndroid::get_env();
		env->CallVoidMethod(godot_instance, _set_keep_screen_on, p_enabled);
	}
}

void GodotJavaWrapper::alert(const String &p_message, const String &p_title) {
	if (_alert) {
		JNIEnv *env = ThreadAndroid::get_env();
		jstring jStrMessage = env->NewStringUTF(p_message.utf8().get_data());
		jstring jStrTitle = env->NewStringUTF(p_title.utf8().get_data());
		env->CallVoidMethod(godot_instance, _alert, jStrMessage, jStrTitle);
	}
}

int GodotJavaWrapper::get_gles_version_code() {
	JNIEnv *env = ThreadAndroid::get_env();
	if (_get_GLES_version_code) {
		return env->CallIntMethod(godot_instance, _get_GLES_version_code);
	}

	return 0;
}

bool GodotJavaWrapper::has_get_clipboard() {
	return _get_clipboard != 0;
}

String GodotJavaWrapper::get_clipboard() {
	if (_get_clipboard) {
		JNIEnv *env = ThreadAndroid::get_env();
		jstring s = (jstring)env->CallObjectMethod(godot_instance, _get_clipboard);
		return jstring_to_string(s, env);
	} else {
		return String();
	}
}

bool GodotJavaWrapper::has_set_clipboard() {
	return _set_clipboard != 0;
}

void GodotJavaWrapper::set_clipboard(const String &p_text) {
	if (_set_clipboard) {
		JNIEnv *env = ThreadAndroid::get_env();
		jstring jStr = env->NewStringUTF(p_text.utf8().get_data());
		env->CallVoidMethod(godot_instance, _set_clipboard, jStr);
	}
}

bool GodotJavaWrapper::request_permission(const String &p_name) {
	if (_request_permission) {
		JNIEnv *env = ThreadAndroid::get_env();
		jstring jStrName = env->NewStringUTF(p_name.utf8().get_data());
		return env->CallBooleanMethod(godot_instance, _request_permission, jStrName);
	} else {
		return false;
	}
}