godot/platform/android/plugin/godot_plugin_jni.cpp

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/*  godot_plugin_jni.cpp                                                 */
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#include "godot_plugin_jni.h"

#include <core/config/engine.h>
#include <core/config/project_settings.h>
#include <core/error/error_macros.h>
#include <platform/android/api/jni_singleton.h>
#include <platform/android/jni_utils.h>
#include <platform/android/string_android.h>

static HashMap<String, JNISingleton *> jni_singletons;

extern "C" {

JNIEXPORT void JNICALL Java_org_godotengine_godot_plugin_GodotPlugin_nativeRegisterSingleton(JNIEnv *env, jclass clazz, jstring name, jobject obj) {
	String singname = jstring_to_string(name, env);
	JNISingleton *s = (JNISingleton *)ClassDB::instantiate("JNISingleton");
	s->set_instance(env->NewGlobalRef(obj));
	jni_singletons[singname] = s;

	Engine::get_singleton()->add_singleton(Engine::Singleton(singname, s));
	ProjectSettings::get_singleton()->set(singname, s);
}

JNIEXPORT void JNICALL Java_org_godotengine_godot_plugin_GodotPlugin_nativeRegisterMethod(JNIEnv *env, jclass clazz, jstring sname, jstring name, jstring ret, jobjectArray args) {
	String singname = jstring_to_string(sname, env);

	ERR_FAIL_COND(!jni_singletons.has(singname));

	JNISingleton *s = jni_singletons.get(singname);

	String mname = jstring_to_string(name, env);
	String retval = jstring_to_string(ret, env);
	Vector<Variant::Type> types;
	String cs = "(";

	int stringCount = env->GetArrayLength(args);

	for (int i = 0; i < stringCount; i++) {
		jstring string = (jstring)env->GetObjectArrayElement(args, i);
		const String rawString = jstring_to_string(string, env);
		types.push_back(get_jni_type(rawString));
		cs += get_jni_sig(rawString);
	}

	cs += ")";
	cs += get_jni_sig(retval);
	jclass cls = env->GetObjectClass(s->get_instance());
	jmethodID mid = env->GetMethodID(cls, mname.ascii().get_data(), cs.ascii().get_data());
	if (!mid) {
		print_line("Failed getting method ID " + mname);
	}

	s->add_method(mname, mid, types, get_jni_type(retval));
}

JNIEXPORT void JNICALL Java_org_godotengine_godot_plugin_GodotPlugin_nativeRegisterSignal(JNIEnv *env, jclass clazz, jstring j_plugin_name, jstring j_signal_name, jobjectArray j_signal_param_types) {
	String singleton_name = jstring_to_string(j_plugin_name, env);

	ERR_FAIL_COND(!jni_singletons.has(singleton_name));

	JNISingleton *singleton = jni_singletons.get(singleton_name);

	String signal_name = jstring_to_string(j_signal_name, env);
	Vector<Variant::Type> types;

	int stringCount = env->GetArrayLength(j_signal_param_types);

	for (int i = 0; i < stringCount; i++) {
		jstring j_signal_param_type = (jstring)env->GetObjectArrayElement(j_signal_param_types, i);
		const String signal_param_type = jstring_to_string(j_signal_param_type, env);
		types.push_back(get_jni_type(signal_param_type));
	}

	singleton->add_signal(signal_name, types);
}

JNIEXPORT void JNICALL Java_org_godotengine_godot_plugin_GodotPlugin_nativeEmitSignal(JNIEnv *env, jclass clazz, jstring j_plugin_name, jstring j_signal_name, jobjectArray j_signal_params) {
	String singleton_name = jstring_to_string(j_plugin_name, env);

	ERR_FAIL_COND(!jni_singletons.has(singleton_name));

	JNISingleton *singleton = jni_singletons.get(singleton_name);

	String signal_name = jstring_to_string(j_signal_name, env);

	int count = env->GetArrayLength(j_signal_params);

	Variant *variant_params = (Variant *)alloca(sizeof(Variant) * count);
	const Variant **args = (const Variant **)alloca(sizeof(Variant *) * count);

	for (int i = 0; i < count; i++) {
		jobject j_param = env->GetObjectArrayElement(j_signal_params, i);
		variant_params[i] = _jobject_to_variant(env, j_param);
		args[i] = &variant_params[i];
		env->DeleteLocalRef(j_param);
	}

	singleton->emit_signalp(StringName(signal_name), args, count);
}

JNIEXPORT void JNICALL Java_org_godotengine_godot_plugin_GodotPlugin_nativeRegisterGDExtensionLibraries(JNIEnv *env, jclass clazz, jobjectArray gdextension_paths) {
	int gdextension_count = env->GetArrayLength(gdextension_paths);
	if (gdextension_count == 0) {
		return;
	}

	// Retrieve the current list of gdextension libraries.
	Array singletons;
	if (ProjectSettings::get_singleton()->has_setting("gdextension/singletons")) {
		singletons = GLOBAL_GET("gdextension/singletons");
	}

	// Insert the libraries provided by the plugin
	for (int i = 0; i < gdextension_count; i++) {
		jstring relative_path = (jstring)env->GetObjectArrayElement(gdextension_paths, i);

		String path = "res://" + jstring_to_string(relative_path, env);
		if (!singletons.has(path)) {
			singletons.push_back(path);
		}
		env->DeleteLocalRef(relative_path);
	}

	// Insert the updated list back into project settings.
	ProjectSettings::get_singleton()->set("gdextension/singletons", singletons);
}
}