Implement basic virtual Room support based on enet (#2803)

* Added support for network with ENet lib,

connecting is possible, but data can't be sent, yet.

* fixup! Added support for network with ENet lib,

* fixup! CLang

* fixup! Added support for network with ENet lib,

* fixup! Added support for network with ENet lib,

* fixup! Clang format

* More fixups!

* Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Clang again

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

* fixup! Moved ENetHost* and ENetPeer* into pimpl classes

1 files changed, 60 insertions, 0 deletions

diff --git a/src/network/room.cpp b/src/network/room.cpp
new file mode 100644
index 000000000..48de2f5cb
--- /dev/null
+++ b/src/network/room.cpp
@@ -0,0 +1,60 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "enet/enet.h"
+#include "network/room.h"
+
+namespace Network {
+
+/// Maximum number of concurrent connections allowed to this room.
+static constexpr u32 MaxConcurrentConnections = 10;
+
+class Room::RoomImpl {
+public:
+    ENetHost* server = nullptr; ///< Network interface.
+
+    std::atomic<State> state{State::Closed}; ///< Current state of the room.
+    RoomInformation room_information;        ///< Information about this room.
+};
+
+Room::Room() : room_impl{std::make_unique<RoomImpl>()} {}
+
+Room::~Room() = default;
+
+void Room::Create(const std::string& name, const std::string& server_address, u16 server_port) {
+    ENetAddress address;
+    address.host = ENET_HOST_ANY;
+    enet_address_set_host(&address, server_address.c_str());
+    address.port = server_port;
+
+    room_impl->server = enet_host_create(&address, MaxConcurrentConnections, NumChannels, 0, 0);
+    // TODO(B3N30): Allow specifying the maximum number of concurrent connections.
+    room_impl->state = State::Open;
+
+    room_impl->room_information.name = name;
+    room_impl->room_information.member_slots = MaxConcurrentConnections;
+
+    // TODO(B3N30): Start the receiving thread
+}
+
+Room::State Room::GetState() const {
+    return room_impl->state;
+}
+
+const RoomInformation& Room::GetRoomInformation() const {
+    return room_impl->room_information;
+}
+
+void Room::Destroy() {
+    room_impl->state = State::Closed;
+    // TODO(B3n30): Join the receiving thread
+
+    if (room_impl->server) {
+        enet_host_destroy(room_impl->server);
+    }
+    room_impl->room_information = {};
+    room_impl->server = nullptr;
+}
+
+} // namespace Network