Add an SSCSM controller and environment skeleton

src/script/sscsm/sscsm_environment.cpp

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2024 Luanti authors
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+#include "sscsm_environment.h"
+#include "sscsm_requests.h"
+#include "sscsm_events.h"
+#include "sscsm_stupid_channel.h"
+
+
+void *SSCSMEnvironment::run()
+{
+	while (true) {
+		auto next_event = requestPollNextEvent();
+
+		if (dynamic_cast<SSCSMEventTearDown *>(next_event.get())) {
+			break;
+		}
+
+		next_event->exec(this);
+	}
+
+	return nullptr;
+}
+
+SerializedSSCSMAnswer SSCSMEnvironment::exchange(SerializedSSCSMRequest req)
+{
+	return m_channel->exchangeA(std::move(req));
+}
+
+std::unique_ptr<ISSCSMEvent> SSCSMEnvironment::requestPollNextEvent()
+{
+	auto request = SSCSMRequestPollNextEvent{};
+	auto answer = deserializeSSCSMAnswer<SSCSMRequestPollNextEvent::Answer>(
+			exchange(serializeSSCSMRequest(request))
+		);
+	return std::move(answer.next_event);
+}
+
+MapNode SSCSMEnvironment::requestGetNode(v3s16 pos)
+{
+	auto request = SSCSMRequestGetNode{};
+	request.pos = pos;
+	auto answer = deserializeSSCSMAnswer<SSCSMRequestGetNode::Answer>(
+			exchange(serializeSSCSMRequest(request))
+		);
+	return answer.node;
+}