unreliable packets

Il est caché pour l'instant parce que c'est plus rapide à debug le reste pour le moment

Reviewed-on: #1
Co-authored-by: Persson-dev <sim16.prib@gmail.com>
Co-committed-by: Persson-dev <sim16.prib@gmail.com>

godot/Scenes/Characters/player.tscn

@@ -3276,7 +3276,6 @@ node_connections = [&"ground_air_transition", 0, &"iwr_blend", &"ground_air_tran
 velocity = Vector3(0, -5821.84, 0)
 
 [node name="Mesh" type="Node3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.0730165, 0)
 
 [node name="Armature" type="Node3D" parent="Mesh"]
 transform = Transform3D(0.01, 0, 0, 0, -3.57628e-09, -0.01, 0, 0.01, -3.57628e-09, 0, 0, 0)
@@ -3750,15 +3749,6 @@ skin = SubResource("Skin_l3wpu")
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0.908729, 0)
 shape = SubResource("CapsuleShape3D_mm42w")
 
-[node name="SpringArmPivot" type="SpringArmPivot" parent="."]
-
-[node name="SpringArm3D" type="SpringArm3D" parent="SpringArmPivot"]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1.31667, 0)
-spring_length = 2.0
-margin = 0.2
-
-[node name="Camera3D" type="Camera3D" parent="SpringArmPivot/SpringArm3D"]
-
 [node name="AnimationPlayer" type="AnimationPlayer" parent="."]
 root_node = NodePath("../Mesh")
 libraries = {

godot/Scenes/Levels/client_world.tscn

@@ -0,0 +1,7 @@
+[gd_scene load_steps=2 format=3 uid="uid://bqv0m8kbr300b"]
+
+[ext_resource type="PackedScene" path="res://Scenes/Levels/world.tscn" id="1_ajsqk"]
+
+[node name="World" type="ClientWorld"]
+
+[node name="WorldContent" parent="." instance=ExtResource("1_ajsqk")]

godot/Scenes/Levels/server_world.tscn

@@ -0,0 +1,7 @@
+[gd_scene load_steps=2 format=3 uid="uid://c2p67anlxe3mk"]
+
+[ext_resource type="PackedScene" path="res://Scenes/Levels/world.tscn" id="1_tecss"]
+
+[node name="World" type="ServerWorld"]
+
+[node name="WorldContent" parent="." instance=ExtResource("1_tecss")]

godot/Scenes/Levels/world.tscn

@@ -1,13 +1,12 @@
-[gd_scene load_steps=18 format=3 uid="uid://coue2qehpn4fr"]
+[gd_scene load_steps=17 format=3 uid="uid://cl8gww414apoq"]
 
-[ext_resource type="Texture2D" path="res://Assets/Textures/Sky.png" id="1_mnexj"]
-[ext_resource type="Texture2D" path="res://Assets/Textures/Black.png" id="2_fkwcn"]
-[ext_resource type="Texture2D" path="res://Assets/Textures/Orange.png" id="3_ux02w"]
-[ext_resource type="Texture2D" path="res://Assets/Textures/Green.png" id="4_wp15n"]
-[ext_resource type="PackedScene" uid="uid://d38w4ae3qj0k4" path="res://Scenes/Characters/first_person_player.tscn" id="5_8ctht"]
+[ext_resource type="Texture2D" path="res://Assets/Textures/Sky.png" id="1_tcyn8"]
+[ext_resource type="Texture2D" path="res://Assets/Textures/Black.png" id="2_j33w8"]
+[ext_resource type="Texture2D" path="res://Assets/Textures/Orange.png" id="3_n1lus"]
+[ext_resource type="Texture2D" path="res://Assets/Textures/Green.png" id="4_klpsf"]
 
 [sub_resource type="PanoramaSkyMaterial" id="PanoramaSkyMaterial_6c4vd"]
-panorama = ExtResource("1_mnexj")
+panorama = ExtResource("1_tcyn8")
 
 [sub_resource type="Sky" id="Sky_5ngqa"]
 sky_material = SubResource("PanoramaSkyMaterial_6c4vd")
@@ -19,7 +18,7 @@ tonemap_mode = 2
 glow_enabled = true
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_ajchh"]
-albedo_texture = ExtResource("2_fkwcn")
+albedo_texture = ExtResource("2_j33w8")
 uv1_triplanar = true
 
 [sub_resource type="PlaneMesh" id="PlaneMesh_mmup0"]
@@ -30,7 +29,7 @@ size = Vector2(50, 50)
 data = PackedVector3Array(25, 0, 25, -25, 0, 25, 25, 0, -25, -25, 0, 25, -25, 0, -25, 25, 0, -25)
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_jkvud"]
-albedo_texture = ExtResource("3_ux02w")
+albedo_texture = ExtResource("3_n1lus")
 uv1_triplanar = true
 
 [sub_resource type="BoxMesh" id="BoxMesh_plpqy"]
@@ -45,7 +44,7 @@ left_to_right = -2.0
 size = Vector3(5, 5, 5)
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_pfpgv"]
-albedo_texture = ExtResource("4_wp15n")
+albedo_texture = ExtResource("4_klpsf")
 uv1_triplanar = true
 
 [sub_resource type="ConcavePolygonShape3D" id="ConcavePolygonShape3D_rit6o"]
@@ -87,4 +86,4 @@ surface_material_override/0 = SubResource("StandardMaterial3D_pfpgv")
 [node name="CollisionShape3D" type="CollisionShape3D" parent="Slope/StaticBody3D"]
 shape = SubResource("ConcavePolygonShape3D_rit6o")
 
-[node name="FirstPersonPlayer" parent="." instance=ExtResource("5_8ctht")]
+[node name="Players" type="Node" parent="."]

godot/Scenes/Menus/mainmenu.tscn

@@ -0,0 +1,41 @@
+[gd_scene format=3 uid="uid://bqfqg7xwwlxd8"]
+
+[node name="MainMenu" type="MainMenu"]
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+grow_horizontal = 2
+grow_vertical = 2
+size_flags_horizontal = 4
+size_flags_vertical = 4
+
+[node name="Container" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 8
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+offset_left = -228.512
+offset_top = -89.5
+offset_right = 228.512
+offset_bottom = 89.5
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="JoinButton" type="Button" parent="Container"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 35
+text = "Join Game"
+
+[node name="CreateButton" type="Button" parent="Container"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 35
+text = "Create Game"
+
+[node name="QuitButton" type="Button" parent="Container"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 35
+text = "Quit"

godot/Scenes/Network/networking.tscn

@@ -0,0 +1,3 @@
+[gd_scene format=3 uid="uid://clafls1xhludi"]
+
+[node name="NetworkInterface" type="NetworkInterface"]

godot/Scenes/Network/server.tscn

@@ -0,0 +1,3 @@
+[gd_scene format=3 uid="uid://us5sb4a0kq8d"]
+
+[node name="Server" type="Server"]

godot/Scenes/main.tscn

@@ -0,0 +1,10 @@
+[gd_scene load_steps=3 format=3 uid="uid://4jt0v2b2l4rt"]
+
+[ext_resource type="PackedScene" path="res://Scenes/Network/networking.tscn" id="1_06ibn"]
+[ext_resource type="PackedScene" path="res://Scenes/Menus/mainmenu.tscn" id="2_lavg1"]
+
+[node name="Main" type="Main"]
+
+[node name="Network" parent="." instance=ExtResource("1_06ibn")]
+
+[node name="MainMenu" parent="." instance=ExtResource("2_lavg1")]

godot/bin/Blitz3.gdextension

@@ -1,5 +1,5 @@
 [icons]
-Blitz3 = "res://icon.svg"
+Blitz3 = "res://icon.png"
 
 [configuration]
 

godot/icon.svg

@@ -1 +0,0 @@
-<svg height="128" width="128" xmlns="http://www.w3.org/2000/svg"><rect x="2" y="2" width="124" height="124" rx="14" fill="#363d52" stroke="#212532" stroke-width="4"/><g transform="scale(.101) translate(122 122)"><g fill="#fff"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 813 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H447l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c3 34 55 34 58 0v-86c-3-34-55-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></g></svg>

godot/project.godot

@@ -11,9 +11,14 @@ config_version=5
 [application]
 
 config/name="Blitz3"
-run/main_scene="res://Scenes/Levels/world.tscn"
+run/main_scene="res://Scenes/main.tscn"
 config/features=PackedStringArray("4.2", "Forward Plus")
-config/icon="res://icon.svg"
+config/icon="res://icon.png"
+
+[display]
+
+window/size/viewport_width=1920
+window/size/viewport_height=1080
 
 [input]
 

include/blitz/common/NonCopyable.h

@@ -0,0 +1,25 @@
+#pragma once
+
+/**
+ * \file NonCopyable.h
+ * \brief File containing the blitz::NonCopyable class
+ */
+
+namespace blitz {
+
+/**
+ * \class NonCopyable
+ * \brief Class used to make a class non copyable
+ * \note Inherit from this class privately to make a class non copyable
+ */
+class NonCopyable {
+  public:
+	NonCopyable(const NonCopyable&) = delete;
+	NonCopyable& operator=(const NonCopyable&) = delete;
+
+  protected:
+	NonCopyable() {}
+	~NonCopyable() {}
+};
+
+}  // namespace blitz

include/blitz/common/Types.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <cstdint>
+
+namespace blitz {
+
+using EntityID = std::uint64_t;
+using PeerID = std::int32_t;
+using PlayerID = PeerID;
+
+}  // namespace blitz

include/blitz/godot/NetworkInterface.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <blitz/protocol/PacketDispatcher.h>
+#include <blitz/protocol/Packets.h>
+#include <godot_cpp/classes/node.hpp>
+
+namespace blitz {
+
+class NetworkInterface : public godot::Node, public protocol::PacketDispatcher {
+	GDCLASS(NetworkInterface, godot::Node)
+  protected:
+	static void _bind_methods();
+
+  public:
+	NetworkInterface();
+	~NetworkInterface();
+
+	void BroadcastPacket(const protocol::Packet& a_Packet);
+	void SendPacket(PeerID a_Peer, const protocol::Packet& a_Packet);
+
+	godot::Error JoinGame(const godot::String& a_Address, uint16_t a_Port);
+	godot::Error CreateGame(uint16_t a_Port, bool a_Dedicated = false);
+
+	void ShutdownNetwork();
+
+	void _ready() override;
+
+  private:
+	void RecievePacketDataReliable(godot::PackedByteArray a_PacketData);
+	void RecievePacketDataUnreliable(godot::PackedByteArray a_PacketData);
+	void RecievePacketDataUnreliableOrdered(godot::PackedByteArray a_PacketData);
+
+	void OnPlayerConnected(PeerID a_PeerId);
+	void OnPlayerDisconnected(PeerID a_PeerId);
+	void OnConnectOk();
+	void OnConnectFail();
+	void OnServerDisconnected();
+};
+
+}  // namespace blitz

include/blitz/godot/World.h

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <godot_cpp/classes/node3d.hpp>
+
+#include <blitz/protocol/PacketHandler.h>
+
+namespace blitz {
+
+class Player;
+class NetworkInterface;
+
+class World : public godot::Node3D, public protocol::PacketHandler {
+	GDCLASS(World, godot::Node3D)
+  protected:
+	static void _bind_methods();
+
+	World();
+	~World();
+
+  public:
+	// Godot overrides
+	void _ready() override;
+
+	Player* GetPlayerById(PlayerID a_PlayerId);
+
+	void HandlePacket(const protocol::packets::PlayerJoin&) override;
+	void HandlePacket(const protocol::packets::PlayerLeave&) override;
+	void HandlePacket(const protocol::packets::PlayerPositionAndRotation&) override;
+
+  protected:
+	NetworkInterface* m_NetworkInterface;
+	godot::Node* m_Players;
+	float m_PassedTime;
+
+
+	void AddPlayer(PlayerID a_PlayerId, godot::String a_PlayerName);
+	void RemovePlayer(PlayerID a_PlayerId);
+	void SetPlayerPositionAndRotation(PlayerID a_PlayerId, const godot::Vector3& a_Position, const godot::Vector3& a_Rotation);
+};
+}  // namespace blitz

include/blitz/protocol/ByteBuffer.h

@@ -0,0 +1,94 @@
+#pragma once
+
+#include <godot_cpp/variant/packed_byte_array.hpp>
+#include <godot_cpp/variant/string.hpp>
+#include <stdexcept>
+#include <vector>
+
+namespace blitz {
+namespace protocol {
+
+class PlayerInfo;
+
+class ByteBuffer {
+  private:
+	godot::PackedByteArray m_Buffer;
+	std::size_t m_ReadOffset;
+
+  public:
+	class ReadError : public std::runtime_error {
+	  public:
+		ReadError(const std::string& msg) : std::runtime_error(msg) {}
+	};
+
+	ByteBuffer(godot::PackedByteArray&& a_Buffer) : m_Buffer(std::move(a_Buffer)), m_ReadOffset(0) {}
+	ByteBuffer() : m_ReadOffset(0) {
+		m_Buffer.resize(0);
+	}
+
+	const godot::PackedByteArray& GetByteArray() const {
+		return m_Buffer;
+	}
+
+	godot::PackedByteArray& GetByteArray() {
+		return m_Buffer;
+	}
+
+	// Integers
+	ByteBuffer& operator<<(int8_t a_Data);
+	ByteBuffer& operator>>(int8_t& a_Data);
+	ByteBuffer& operator<<(uint8_t a_Data);
+	ByteBuffer& operator>>(uint8_t& a_Data);
+
+	ByteBuffer& operator<<(int16_t a_Data);
+	ByteBuffer& operator>>(int16_t& a_Data);
+	ByteBuffer& operator<<(uint16_t a_Data);
+	ByteBuffer& operator>>(uint16_t& a_Data);
+
+	ByteBuffer& operator<<(int32_t a_Data);
+	ByteBuffer& operator>>(int32_t& a_Data);
+	ByteBuffer& operator<<(uint32_t a_Data);
+	ByteBuffer& operator>>(uint32_t& a_Data);
+
+	ByteBuffer& operator<<(int64_t a_Data);
+	ByteBuffer& operator>>(int64_t& a_Data);
+	ByteBuffer& operator<<(uint64_t a_Data);
+	ByteBuffer& operator>>(uint64_t& a_Data);
+
+	ByteBuffer& operator<<(float a_Data);
+	ByteBuffer& operator>>(float& a_Data);
+	ByteBuffer& operator<<(double a_Data);
+	ByteBuffer& operator>>(double& a_Data);
+
+	ByteBuffer& operator<<(const godot::String& a_Data);
+	ByteBuffer& operator>>(godot::String& a_Data);
+
+	ByteBuffer& operator<<(const godot::Vector3& a_Data);
+	ByteBuffer& operator>>(godot::Vector3& a_Data);
+
+	template <typename T>
+	ByteBuffer& operator<<(const std::vector<T>& a_Data) {
+		*this << static_cast<std::uint32_t>(a_Data.size());
+		for (const T& data : a_Data) {
+			*this << data;
+		}
+		return *this;
+	}
+
+	template <typename T>
+	ByteBuffer& operator>>(std::vector<T>& a_Data) {
+		std::uint32_t arraySize;
+		*this >> arraySize;
+		a_Data.resize(arraySize);
+		for (std::uint32_t i = 0; i < arraySize; i++) {
+			*this >> a_Data[i];
+		}
+		return *this;
+	}
+
+	ByteBuffer& operator<<(const PlayerInfo& a_Data);
+	ByteBuffer& operator>>(PlayerInfo& a_Data);
+};
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketData.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <blitz/common/Types.h>
+#include <vector>
+#include <godot_cpp/variant/string.hpp>
+#include <godot_cpp/variant/vector3.hpp>
+
+namespace blitz {
+namespace protocol {
+
+struct PlayerInfo {
+	PlayerID m_PlayerId;
+	godot::String m_PlayerName;
+};
+
+namespace data {
+
+struct PlayerLogin {
+	godot::String m_PlayerName;
+};
+
+struct UpdateHealth {
+	float m_NewHealth;
+};
+
+struct LoggingSuccess {
+	PlayerID m_PlayerId;
+};
+
+struct PlayerDeath {};
+
+struct PlayerJoin {
+	PlayerInfo m_Player;
+};
+
+struct PlayerLeave {
+	PlayerID m_PlayerId;
+};
+
+struct PlayerStats {};
+
+struct PlayerList {
+	std::vector<PlayerInfo> m_Players;
+};
+
+struct ServerConfig {};
+
+struct ServerTps {};
+
+struct UpdateGameState {};
+
+struct KeepAlive {
+	std::uint64_t m_KeepAliveId;
+};
+
+struct Disconnect {};
+
+struct ChatMessage {
+	godot::String m_Text;
+};
+
+struct PlayerPositionAndRotation {
+	PlayerID m_Player;
+	godot::Vector3 m_Position;
+	godot::Vector3 m_Rotation;
+};
+
+struct PlayerShoot {};
+
+}  // namespace data
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketDeclare.h

@@ -0,0 +1,49 @@
+#pragma once
+
+/**
+ * \file PacketDeclare.h
+ * \brief Holds the definitions of the packets (but not their content)
+ */
+
+namespace blitz {
+namespace protocol {
+
+/**
+ * \enum PacketSender
+ * \brief Indicate who should send a packet
+ */
+enum class PacketSenderType {
+	/** Sent by clients and server */
+	Both,
+	/** Sent by clients to the server */
+	Client,
+	/** Sent by server to the clients */
+	Server,
+};
+
+
+/**
+ * \def DeclareAllPacket
+ * \brief Avoids repetitive operations on packets
+ */
+#define DeclareAllPacket() \
+	DeclarePacket(ChatMessage, Reliable, Both) \
+	DeclarePacket(Disconnect, Reliable, Both) \
+	DeclarePacket(KeepAlive, Reliable, Both)  \
+	DeclarePacket(LoggingSuccess, Reliable, Server) \
+	DeclarePacket(PlayerDeath, Reliable, Server) \
+	DeclarePacket(PlayerJoin, Reliable, Server) \
+	DeclarePacket(PlayerLeave, Reliable, Server) \
+	DeclarePacket(PlayerList, Reliable, Server) \
+	DeclarePacket(PlayerLogin, Reliable, Client) \
+	DeclarePacket(PlayerPositionAndRotation, Unreliable, Both) \
+	DeclarePacket(PlayerShoot, Reliable, Both) \
+	DeclarePacket(PlayerStats, Reliable, Server) \
+	DeclarePacket(ServerConfig, Reliable, Server) \
+	DeclarePacket(ServerTps, Reliable, Server) \
+	DeclarePacket(UpdateGameState, Reliable, Server) \
+	DeclarePacket(UpdateHealth, Reliable, Client)
+
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketDispatcher.h

@@ -0,0 +1,58 @@
+#pragma once
+
+/**
+ * \file PacketDispatcher.h
+ * \brief File containing the blitz::protocol::PacketDispatcher class
+ */
+
+#include <blitz/common/NonCopyable.h>
+#include <blitz/protocol/Packets.h>
+
+#include <map>
+
+namespace blitz {
+namespace protocol {
+
+class PacketHandler;
+
+/**
+ * \class PacketDispatcher
+ * \brief Class used to dispatch packets
+ */
+class PacketDispatcher : private NonCopyable {
+  private:
+	std::map<PacketType, std::vector<PacketHandler*>> m_Handlers;
+
+  public:
+	/**
+	 * \brief Constructor
+	 */
+	PacketDispatcher() {}
+
+	/**
+	 * \brief Dispatch a packet
+	 * \param packet The packet to dispatch
+	 */
+	void Dispatch(const Packet& packet);
+
+	/**
+	 * \brief Register a packet handler
+	 * \param type The packet type
+	 * \param handler The packet handler
+	 */
+	void RegisterHandler(PacketType type, PacketHandler& handler);
+	/**
+	 * \brief Unregister a packet handler
+	 * \param type The packet type
+	 * \param handler The packet handler
+	 */
+	void UnregisterHandler(PacketType type, PacketHandler& handler);
+	/**
+	 * \brief Unregister a packet handler
+	 * \param handler The packet handler
+	 */
+	void UnregisterHandler(PacketHandler& handler);
+};
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketFactory.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <blitz/protocol/Packets.h>
+#include <memory>
+
+namespace blitz {
+namespace protocol {
+namespace PacketFactory {
+
+template<typename PacketDerived, typename = typename std::enable_if<std::is_base_of<Packet, PacketDerived>::value>::type>
+std::unique_ptr<PacketDerived> CreatePacket() {
+    return std::make_unique<PacketDerived>();
+}
+
+const std::unique_ptr<Packet>& CreateReadOnlyPacket(PacketType a_Type);
+
+void Init();
+
+}  // namespace PacketFactory
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketHandler.h

@@ -0,0 +1,34 @@
+#pragma once
+
+/**
+ * \file PacketHandler.h
+ * \brief File containing the blitz::protocol::PacketHandler class
+ */
+
+#include <blitz/protocol/Packets.h>
+#include <blitz/protocol/PacketVisitor.h>
+
+namespace blitz {
+namespace protocol {
+
+class PacketDispatcher;
+
+#define DeclarePacket(PacketName, ...) virtual void Visit(const packets::PacketName&); virtual void HandlePacket(const packets::PacketName&) {}
+
+/**
+ * \class PacketHandler
+ * \brief Class used to handle packets
+ */
+class PacketHandler : public PacketVisitor {
+  public:
+	PacketHandler() {}
+	~PacketHandler() {}
+
+	DeclareAllPacket()
+
+};
+
+#undef DeclarePacket
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketSender.h

@@ -0,0 +1,57 @@
+#pragma once
+
+#include <blitz/protocol/PacketVisitor.h>
+
+namespace blitz {
+
+class NetworkInterface;
+
+namespace protocol {
+
+///////////////////////
+/* PacketBroadcaster */
+///////////////////////
+
+#define DeclarePacket(PacketName, Reliability, ...) void Visit(const protocol::packets::PacketName& a_Packet) override;
+
+class PacketBroadcaster : public protocol::PacketVisitor {
+  private:
+	NetworkInterface& m_NetworkInterface;
+
+  public:
+	PacketBroadcaster(NetworkInterface& a_NetworkInterface) : m_NetworkInterface(a_NetworkInterface) {}
+
+	void BroadcastPacket(const protocol::Packet& a_Packet) {
+		Check(a_Packet);
+	}
+
+	DeclareAllPacket()
+};
+
+
+
+
+
+
+//////////////////
+/* PacketSender */
+//////////////////
+class PacketSender : public protocol::PacketVisitor {
+  private:
+	NetworkInterface& m_NetworkInterface;
+	PeerID m_PeerId;
+
+  public:
+	PacketSender(PeerID a_PeerId, NetworkInterface& a_NetworkInterface) : m_PeerId(a_PeerId), m_NetworkInterface(a_NetworkInterface) {}
+
+	void SendPacket(const protocol::Packet& a_Packet) {
+		Check(a_Packet);
+	}
+
+	DeclareAllPacket()
+};
+
+#undef DeclarePacket
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketSerializer.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <blitz/protocol/Packets.h>
+#include <godot_cpp/variant/packed_byte_array.hpp>
+#include <memory>
+
+namespace blitz {
+namespace protocol {
+
+using PacketPtr = std::unique_ptr<Packet>;
+
+namespace PacketSerializer {
+
+godot::PackedByteArray Serialize(const Packet& a_Packet);
+
+std::unique_ptr<Packet> Deserialize(godot::PackedByteArray& a_Data);
+
+}
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/PacketVisitor.h

@@ -0,0 +1,39 @@
+#pragma once
+
+/**
+ * \file PacketVisitor.h
+ * \brief File containing the blitz::protocol::PacketVisitor class
+ */
+
+#include <blitz/protocol/Packets.h>
+
+namespace blitz {
+namespace protocol {
+
+#define DeclarePacket(PacketName, ...)                                                                                                \
+	/** This function is called when the packet processed by PacketVisitor::Check is a PacketName */                                                                                                                            \
+	virtual void Visit(const packets::PacketName&) {}
+
+/**
+ * \class PacketVisitor
+ * \brief This class uses double-dispatch in order to find the real type of a packet
+ */
+class PacketVisitor : private NonCopyable {
+  protected:
+	PacketVisitor() {}
+	virtual ~PacketVisitor() {}
+
+  public:
+	/**
+	 * \brief Calls the right PacketVisitor::Visit method corresponding to the real type of the packet
+	 * \param packet the Packet to visit
+	 */
+	void Check(const Packet& packet);
+
+	DeclareAllPacket()
+};
+
+#undef DeclarePacket
+
+}  // namespace protocol
+}  // namespace blitz

include/blitz/protocol/Packets.h

@@ -0,0 +1,112 @@
+#pragma once
+
+/**
+ * \file Packets.h
+ * \brief File containing the definitions of the packets
+ */
+
+#include <blitz/common/NonCopyable.h>
+#include <blitz/protocol/PacketData.h>
+#include <blitz/protocol/PacketDeclare.h>
+
+namespace blitz {
+namespace protocol {
+
+class PacketVisitor;
+
+/** A Packet id is 8 bits wide */
+using PacketID = std::uint8_t;
+
+#define DeclarePacket(PacketName, ...) /** PacketName */ PacketName,
+
+/**
+ * \enum PacketType
+ * \brief Map a Packet to an id
+ */
+enum class PacketType : PacketID {
+
+	DeclareAllPacket()
+
+	/** The number of packets */
+	PACKET_COUNT
+};
+
+
+#undef DeclarePacket
+
+
+class Packet : private NonCopyable {
+  public:
+	/**
+	 * \return The real type of the packet
+	 */
+	virtual PacketType GetType() const = 0;
+
+	/**
+	 * \brief The network peer who sent the packet
+	 */
+	PeerID m_Sender;
+
+  private:
+	/** Use a PacketVisitor to make double-dispatch possible */
+	virtual void Accept(PacketVisitor& a_Visitor) const = 0;
+
+	friend class PacketVisitor;
+};
+
+
+
+
+
+namespace packets {
+
+/**
+ * \class ConcretePacket
+ * \brief A Packet associated with an id and holding data
+ * \tparam PT The packet type
+ * \tparam Data The structure holding the data of the packet (in blitz::protocol::data namespace)
+ */
+template <PacketType PT, typename Data>
+class ConcretePacket : public Packet {
+  public:
+	/** The type of the struct holding the data */
+	using PacketDataType = Data;
+
+	/** The structure holding the actual data */
+	PacketDataType m_Data;
+
+	/** Construct the packet with data of type PacketDataType */
+	ConcretePacket(const PacketDataType& a_Data = {});
+
+	constexpr PacketType GetType() const override {
+		return PT;
+	};
+
+  private:
+	void Accept(PacketVisitor& a_Visitor) const override;
+};
+
+
+
+
+
+// define BLITZ_INSTANCIATE_PACKETS
+// before including this file
+// if you want to instantiate templates
+#ifdef BLITZ_INSTANCIATE_PACKETS
+#define DeclarePacket(PacketName, ...)                                                                                                \
+	using PacketName = ConcretePacket<PacketType::PacketName, data::PacketName>;                                                      \
+	template class ConcretePacket<PacketType::PacketName, data::PacketName>;
+#else
+#define DeclarePacket(PacketName, ...) /** Defines the PacketName packet */                                                           \
+	using PacketName = ConcretePacket<PacketType::PacketName, data::PacketName>;
+#endif
+
+DeclareAllPacket()
+
+#undef DeclarePacket
+
+}  // namespace packets
+
+}  // namespace protocol
+}  // namespace blitz

include/client/ClientWorld.h

@@ -0,0 +1,19 @@
+#include <blitz/godot/World.h>
+
+namespace blitz {
+
+class ClientWorld : public World {
+	GDCLASS(ClientWorld, World)
+  protected:
+	static void _bind_methods();
+
+  public:
+	ClientWorld();
+	~ClientWorld();
+	void _process(float delta);
+
+  private:
+    void UpdatePlayerPos();
+};
+
+}  // namespace blitz

include/client/FirstPersonPlayer.h

@@ -1,13 +1,11 @@
 #pragma once
 
-#include <godot_cpp/classes/camera3d.hpp>
-#include <godot_cpp/classes/character_body3d.hpp>
+#include <client/Player.h>
 #include <godot_cpp/classes/input_event_mouse_motion.hpp>
-#include <godot_cpp/classes/node3d.hpp>
 
 namespace blitz {
 
-class FirstPersonPlayer : public godot::CharacterBody3D {
+class FirstPersonPlayer : public Player {
 	GDCLASS(FirstPersonPlayer, godot::CharacterBody3D)
   protected:
 	static void _bind_methods();
@@ -19,7 +17,7 @@ class FirstPersonPlayer : public godot::CharacterBody3D {
 	// Godot overrides
 	void _unhandled_input(const godot::Ref<godot::InputEvent>&);
 	void _physics_process(float delta);
-	void _ready();
+	void _ready() override;
 
   private:
 	godot::Camera3D* m_Camera;
@@ -31,6 +29,8 @@ class FirstPersonPlayer : public godot::CharacterBody3D {
 	void UpdateFOV(float delta);
 	void UpdateCamera(const godot::InputEventMouseMotion&);
 	void UpdatePosition(float delta);
+
+	void UpdateAnimation(float delta);
 };
 
 }  // namespace blitz

include/client/Main.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <godot_cpp/classes/node.hpp>
+
+namespace blitz {
+
+class Main : public godot::Node {
+	GDCLASS(Main, godot::Node)
+  protected:
+	static void _bind_methods();
+
+  public:
+	Main();
+	~Main();
+
+	void _ready() override;
+
+	void ChangeScene(bool a_Server);
+};
+
+}  // namespace blitz

include/client/MainMenu.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <godot_cpp/classes/button.hpp>
+#include <godot_cpp/classes/control.hpp>
+#include <blitz/godot/NetworkInterface.h>
+
+namespace blitz {
+
+class MainMenu : public godot::Control {
+	GDCLASS(MainMenu, godot::Control)
+  protected:
+	static void _bind_methods();
+
+  public:
+	MainMenu();
+	~MainMenu();
+
+	// Godot overrides
+	void _ready() override;
+
+  private:
+	godot::Button* m_JoinButton;
+	godot::Button* m_CreateButton;
+	godot::Button* m_QuitButton;
+
+	NetworkInterface* m_NetworkInterface;
+
+	void OnConnected();
+	void OnDisconnected();
+
+	void OnJoinPressed();
+	void OnCreatePressed();
+	void OnQuitPressed();
+
+	void DisableButtons();
+	void EnableButtons();
+};
+
+}  // namespace blitz

include/client/Player.h

@@ -3,8 +3,12 @@
 #include <godot_cpp/classes/animation_tree.hpp>
 #include <godot_cpp/classes/character_body3d.hpp>
 #include <godot_cpp/classes/node3d.hpp>
+#include <blitz/common/Types.h>
 
 namespace blitz {
+
+class World;
+
 class Player : public godot::CharacterBody3D {
 
 	GDCLASS(Player, godot::CharacterBody3D);
@@ -20,18 +24,21 @@ class Player : public godot::CharacterBody3D {
 	void _physics_process(float delta);
 	void animate(float delta);
 
-  private:
-	godot::Node3D* m_PlayerMesh;
-	godot::Node3D* m_SpringArmPivot;
+	godot::Vector3 GetCameraRotation() const;
+	void SetCameraRotation(const godot::Vector3& a_Rotation);
+
+	PlayerID GetId() const {
+		return m_PeerId;
+	}
+
+  protected:
+	godot::Node3D* m_Mesh;
 	godot::AnimationTree* m_AnimationTree;
 
 	godot::Vector3 m_SnapVector;
 	float m_Speed;
-	/*
-	@onready var player_mesh : Node3D = $Mesh
-@onready var spring_arm_pivot : Node3D = $SpringArmPivot
-@onready var animator : AnimationTree = $AnimationTree
+	PeerID m_PeerId;
 
-	*/
+	friend class World;
 };
 }  // namespace blitz

include/server/Server.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <blitz/common/Types.h>
+#include <godot_cpp/classes/node.hpp>
+
+namespace blitz {
+
+class Lobby;
+class NetworkInterface;
+
+class Server : public godot::Node {
+	GDCLASS(Server, godot::Node)
+  protected:
+	static void _bind_methods();
+
+  public:
+	Server();
+	~Server();
+
+	void _ready() override;
+
+	void OnPlayerConnect(PeerID a_PeerId);
+	void OnPlayerDisconnect(PeerID a_PeerId);
+
+  private:
+	Lobby* m_Lobby;
+	NetworkInterface* m_NetworkInterface;
+
+	godot::TypedArray<PeerID> m_Peers;
+};
+
+}  // namespace blitz

include/server/ServerWorld.h

@@ -0,0 +1,19 @@
+#include <blitz/godot/World.h>
+
+namespace blitz {
+
+class ServerWorld : public World {
+	GDCLASS(ServerWorld, World)
+  protected:
+	static void _bind_methods();
+
+  public:
+	ServerWorld();
+	~ServerWorld();
+	void _process(float delta);
+
+  private:
+	void SyncPlayersPos();
+};
+
+}  // namespace blitz

src/SpringArmPivot.cpp

@@ -1,65 +0,0 @@
-#include "SpringArmPivot.h"
-
-#include "Player.h"
-#include <godot_cpp/classes/engine.hpp>
-#include <godot_cpp/classes/input.hpp>
-#include <godot_cpp/classes/input_event_mouse_motion.hpp>
-#include <godot_cpp/classes/spring_arm3d.hpp>
-#include <godot_cpp/core/error_macros.hpp>
-#include <godot_cpp/core/math.hpp>
-#include <godot_cpp/variant/utility_functions.hpp>
-
-static const float NormalFov = 75.0;
-static const float RunFov = 90.0;
-static const float CameraBlend = 0.05;
-
-namespace blitz {
-
-void SpringArmPivot::_bind_methods() {
-	godot::ClassDB::bind_method(godot::D_METHOD("get_dynfov"), &SpringArmPivot::IsFovDynamic);
-	godot::ClassDB::bind_method(godot::D_METHOD("set_dynfov", "dynamic_fov"), &SpringArmPivot::SetDynamicFov);
-	ADD_PROPERTY(godot::PropertyInfo(godot::Variant::BOOL, "dynamic_fov"), "set_dynfov", "get_dynfov");
-}
-
-SpringArmPivot::SpringArmPivot() {}
-
-SpringArmPivot::~SpringArmPivot() {}
-
-void SpringArmPivot::_ready() {
-	m_SpringArm = Object::cast_to<godot::SpringArm3D>(get_child(0));
-	m_Camera = Object::cast_to<godot::Camera3D>(m_SpringArm->get_child(0));
-	DEV_ASSERT(m_SpringArm);
-	DEV_ASSERT(m_Camera);
-	if (!godot::Engine::get_singleton()->is_editor_hint()) {
-		godot::Input::get_singleton()->set_mouse_mode(godot::Input::MOUSE_MODE_CAPTURED);
-	}
-}
-
-void SpringArmPivot::_unhandled_input(const godot::Ref<godot::InputEvent>& p_event) {
-	auto* event = Object::cast_to<godot::InputEventMouseMotion>(p_event.ptr());
-	if (event) {
-		rotate_y(-event->get_relative().x * 0.005);
-		m_SpringArm->rotate_x(-event->get_relative().y * 0.005);
-
-		godot::Vector3 rotationClamped = m_SpringArm->get_rotation();
-		rotationClamped.x = godot::UtilityFunctions::clamp(rotationClamped.x, -Math_PI / 4, Math_PI / 4);
-		m_SpringArm->set_rotation(rotationClamped);
-	}
-}
-
-void SpringArmPivot::_physics_process(float delta) {
-	if (m_DynamicFOV) {
-		auto* parent = Object::cast_to<Player>(get_owner());
-		if (parent->is_on_floor()) {
-			if (godot::Input::get_singleton()->is_action_pressed("run")) {
-				m_Camera->set_fov(godot::UtilityFunctions::lerp(m_Camera->get_fov(), RunFov, CameraBlend));
-			} else {
-				m_Camera->set_fov(godot::UtilityFunctions::lerp(m_Camera->get_fov(), NormalFov, CameraBlend));
-			}
-		} else {
-			m_Camera->set_fov(godot::UtilityFunctions::lerp(m_Camera->get_fov(), NormalFov, CameraBlend));
-		}
-	}
-}
-
-}  // namespace blitz

src/SpringArmPivot.h

@@ -1,38 +0,0 @@
-#pragma once
-
-#include <godot_cpp/classes/input_event.hpp>
-#include <godot_cpp/classes/node3d.hpp>
-#include <godot_cpp/classes/spring_arm3d.hpp>
-#include <godot_cpp/classes/camera3d.hpp>
-
-namespace blitz {
-class SpringArmPivot : public godot::Node3D {
-
-	GDCLASS(SpringArmPivot, godot::Node3D);
-
-  protected:
-	static void _bind_methods();
-
-  public:
-	SpringArmPivot();
-	~SpringArmPivot();
-
-	void _ready();
-	void _unhandled_input(const godot::Ref<godot::InputEvent>& p_event);
-	void _physics_process(float delta);
-
-	void SetDynamicFov(bool fov) {
-		m_DynamicFOV = fov;
-	}
-
-	bool IsFovDynamic() const {
-		return m_DynamicFOV;
-	}
-
-  private:
-	godot::SpringArm3D* m_SpringArm;
-	godot::Camera3D* m_Camera;
-
-	bool m_DynamicFOV = false;
-};
-}  // namespace blitz

src/blitz/godot/NetworkInterface.cpp

@@ -0,0 +1,160 @@
+#include <blitz/godot/NetworkInterface.h>
+
+#include <blitz/protocol/PacketFactory.h>
+#include <blitz/protocol/PacketSender.h>
+#include <blitz/protocol/PacketSerializer.h>
+#include <blitz/protocol/PacketVisitor.h>
+#include <godot_cpp/classes/e_net_multiplayer_peer.hpp>
+#include <godot_cpp/classes/multiplayer_api.hpp>
+#include <godot_cpp/classes/packed_scene.hpp>
+#include <godot_cpp/classes/resource_loader.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
+
+
+namespace blitz {
+
+#define RPC_CONFIG(functionName, rpc_mode, transfer_mode, call_local, channel)                                                        \
+	{                                                                                                                                 \
+		Dictionary config;                                                                                                            \
+		config["rpc_mode"] = rpc_mode;                                                                                                \
+		config["transfer_mode"] = transfer_mode;                                                                                      \
+		config["call_local"] = call_local;                                                                                            \
+		config["channel"] = channel;                                                                                                  \
+		rpc_config(functionName, config);                                                                                             \
+	}
+
+static const char ServerScenePath[] = "res://Scenes/Network/server.tscn";
+
+using namespace godot;
+
+void NetworkInterface::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("RecievePacketDataReliable", "a_PacketData"), &NetworkInterface::RecievePacketDataReliable);
+	ClassDB::bind_method(D_METHOD("RecievePacketDataUnreliable", "a_PacketData"), &NetworkInterface::RecievePacketDataUnreliable);
+	ClassDB::bind_method(
+		D_METHOD("RecievePacketDataUnreliableOrdered", "a_PacketData"), &NetworkInterface::RecievePacketDataUnreliableOrdered);
+
+	// server
+	ADD_SIGNAL(MethodInfo("player_connected", PropertyInfo(Variant::INT, "peer_id")));
+	ADD_SIGNAL(MethodInfo("player_disconnected", PropertyInfo(Variant::INT, "peer_id")));
+
+	// client
+	ADD_SIGNAL(MethodInfo("server_disconnected"));
+	ADD_SIGNAL(MethodInfo("local_player_connected"));
+
+	protocol::PacketFactory::Init();
+}
+
+NetworkInterface::NetworkInterface() {}
+
+NetworkInterface::~NetworkInterface() {}
+
+void NetworkInterface::_ready() {
+	RPC_CONFIG("RecievePacketDataReliable", MultiplayerAPI::RPC_MODE_ANY_PEER, MultiplayerPeer::TRANSFER_MODE_RELIABLE, true, 0);
+	RPC_CONFIG("RecievePacketDataUnreliable", MultiplayerAPI::RPC_MODE_ANY_PEER, MultiplayerPeer::TRANSFER_MODE_UNRELIABLE, true, 1);
+	RPC_CONFIG("RecievePacketDataUnreliableOrdered", MultiplayerAPI::RPC_MODE_ANY_PEER,
+		MultiplayerPeer::TRANSFER_MODE_UNRELIABLE_ORDERED, true, 2);
+
+	get_multiplayer()->connect("peer_connected", callable_mp(this, &NetworkInterface::OnPlayerConnected));
+	get_multiplayer()->connect("peer_disconnected", callable_mp(this, &NetworkInterface::OnPlayerDisconnected));
+	get_multiplayer()->connect("connected_to_server", callable_mp(this, &NetworkInterface::OnConnectOk));
+	get_multiplayer()->connect("connection_failed", callable_mp(this, &NetworkInterface::OnConnectFail));
+	get_multiplayer()->connect("server_disconnected", callable_mp(this, &NetworkInterface::OnServerDisconnected));
+}
+
+void NetworkInterface::BroadcastPacket(const protocol::Packet& a_Packet) {
+	protocol::PacketBroadcaster packetBroadcaster(*this);
+	packetBroadcaster.BroadcastPacket(a_Packet);
+}
+
+void NetworkInterface::SendPacket(PeerID a_Peer, const protocol::Packet& a_Packet) {
+	protocol::PacketSender packetSender(a_Peer, *this);
+	packetSender.SendPacket(a_Packet);
+}
+
+void NetworkInterface::RecievePacketDataReliable(godot::PackedByteArray a_PacketData) {
+	auto packet = protocol::PacketSerializer::Deserialize(a_PacketData);
+	if (packet) {
+		packet->m_Sender = get_multiplayer()->get_remote_sender_id();
+		Dispatch(*packet);
+	}
+}
+
+void NetworkInterface::RecievePacketDataUnreliable(godot::PackedByteArray a_PacketData) {
+	// we have to copy the function body in order to preserve the remote sender id
+	auto packet = protocol::PacketSerializer::Deserialize(a_PacketData);
+	if (packet) {
+		packet->m_Sender = get_multiplayer()->get_remote_sender_id();
+		Dispatch(*packet);
+	}
+}
+
+void NetworkInterface::RecievePacketDataUnreliableOrdered(godot::PackedByteArray a_PacketData) {
+	// we have to copy the function body in order to preserve the remote sender id
+	auto packet = protocol::PacketSerializer::Deserialize(a_PacketData);
+	if (packet) {
+		packet->m_Sender = get_multiplayer()->get_remote_sender_id();
+		Dispatch(*packet);
+	}
+}
+
+Error NetworkInterface::JoinGame(const String& a_Address, uint16_t a_Port) {
+	auto* peer = memnew(ENetMultiplayerPeer);
+	Error error = peer->create_client(a_Address, a_Port, 3);
+	if (error) {
+		OnConnectFail();
+		return error;
+	}
+
+	get_multiplayer()->set_multiplayer_peer(peer);
+	return Error::OK;
+}
+
+Error NetworkInterface::CreateGame(uint16_t a_Port, bool a_Dedicated) {
+	auto* peer = memnew(ENetMultiplayerPeer);
+	Error error = peer->create_server(a_Port, 50, 3);
+	if (error)
+		return error;
+
+	get_multiplayer()->set_multiplayer_peer(peer);
+
+	Ref<PackedScene> serverScene = ResourceLoader::get_singleton()->load(ServerScenePath);
+	add_child(serverScene->instantiate());
+
+	if (!a_Dedicated) {
+		emit_signal("local_player_connected");
+		emit_signal("player_connected", get_multiplayer()->get_unique_id());
+	}
+
+	return Error::OK;
+}
+
+void NetworkInterface::OnPlayerConnected(PeerID a_PeerId) {
+	emit_signal("player_connected", a_PeerId);
+}
+
+void NetworkInterface::OnPlayerDisconnected(PeerID a_PeerId) {
+	emit_signal("player_disconnected", a_PeerId);
+}
+
+void NetworkInterface::OnConnectOk() {
+	emit_signal("local_player_connected");
+}
+
+void NetworkInterface::OnConnectFail() {
+	ShutdownNetwork();
+	emit_signal("server_disconnected");
+}
+
+void NetworkInterface::OnServerDisconnected() {
+	ShutdownNetwork();
+	emit_signal("server_disconnected");
+}
+
+void NetworkInterface::ShutdownNetwork() {
+	get_multiplayer()->set_multiplayer_peer(nullptr);
+	if (auto* server = find_child("Server")) {
+		server->queue_free();
+	}
+}
+
+}  // namespace blitz

src/blitz/godot/World.cpp

@@ -0,0 +1,108 @@
+#include <blitz/godot/World.h>
+
+#include <blitz/godot/NetworkInterface.h>
+#include <client/FirstPersonPlayer.h>
+#include <client/Player.h>
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/multiplayer_api.hpp>
+#include <godot_cpp/classes/packed_scene.hpp>
+#include <godot_cpp/classes/resource_loader.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
+
+
+using namespace godot;
+
+namespace blitz {
+
+static const char FirstPersonPlayerScenePath[] = "res://Scenes/Characters/first_person_player.tscn";
+static const char PlayerScenePath[] = "res://Scenes/Characters/player.tscn";
+
+void World::_bind_methods() {}
+
+void World::_ready() {
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+
+	m_Players = find_child("Players");
+	DEV_ASSERT(m_Players);
+
+	m_NetworkInterface = Object::cast_to<NetworkInterface>(get_parent()->find_child("Network"));
+	DEV_ASSERT(m_NetworkInterface);
+
+	m_NetworkInterface->RegisterHandler(protocol::PacketType::PlayerJoin, *this);
+	m_NetworkInterface->RegisterHandler(protocol::PacketType::PlayerLeave, *this);
+	m_NetworkInterface->RegisterHandler(protocol::PacketType::PlayerPositionAndRotation, *this);
+}
+
+
+World::World() {}
+
+World::~World() {
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+
+	m_NetworkInterface->UnregisterHandler(*this);
+}
+
+Player* World::GetPlayerById(PlayerID a_PlayerId) {
+	String stringId = UtilityFunctions::var_to_str(a_PlayerId);
+	for (int i = 0; i < m_Players->get_child_count(); i++) {
+		Node* player = m_Players->get_child(i);
+		if (player->get_name() == stringId) {
+			return Object::cast_to<Player>(player);
+		}
+	}
+	return nullptr;
+}
+
+void World::HandlePacket(const protocol::packets::PlayerJoin& a_PlayerJoin) {
+	const protocol::PlayerInfo& playerInfo = a_PlayerJoin.m_Data.m_Player;
+	AddPlayer(playerInfo.m_PlayerId, playerInfo.m_PlayerName);
+}
+
+void World::HandlePacket(const protocol::packets::PlayerLeave& a_PlayerLeave) {
+	RemovePlayer(a_PlayerLeave.m_Data.m_PlayerId);
+}
+
+void World::HandlePacket(const protocol::packets::PlayerPositionAndRotation& a_PlayerPos) {
+	const auto& data = a_PlayerPos.m_Data;
+	if (data.m_Player == get_multiplayer()->get_unique_id() || data.m_Player != a_PlayerPos.m_Sender)
+		return;
+
+	SetPlayerPositionAndRotation(data.m_Player, data.m_Position, data.m_Rotation);
+}
+
+void World::AddPlayer(PlayerID a_PlayerId, String a_PlayerName) {
+	UtilityFunctions::print("New Player with id : ", a_PlayerId, " and name ", a_PlayerName);
+	if (a_PlayerId == get_multiplayer()->get_unique_id()) {
+		Ref<PackedScene> serverScene = ResourceLoader::get_singleton()->load(FirstPersonPlayerScenePath);
+		FirstPersonPlayer* player = Object::cast_to<FirstPersonPlayer>(serverScene->instantiate());
+		player->set_name(UtilityFunctions::var_to_str(a_PlayerId));
+		player->m_PeerId = a_PlayerId;
+		m_Players->add_child(player);
+	} else {
+		Ref<PackedScene> serverScene = ResourceLoader::get_singleton()->load(PlayerScenePath);
+		Player* player = Object::cast_to<Player>(serverScene->instantiate());
+		player->set_name(UtilityFunctions::var_to_str(a_PlayerId));
+		player->m_PeerId = a_PlayerId;
+		m_Players->add_child(player);
+	}
+}
+
+void World::RemovePlayer(PlayerID a_PlayerId) {
+	UtilityFunctions::print("Removing Player with id : ", a_PlayerId);
+	Player* player = GetPlayerById(a_PlayerId);
+	if (player) {
+		player->queue_free();
+	}
+}
+
+void World::SetPlayerPositionAndRotation(PlayerID a_PlayerId, const Vector3& a_Position, const Vector3& a_Rotation) {
+	Player* player = GetPlayerById(a_PlayerId);
+	if (player) {
+		player->set_position(a_Position);
+		player->SetCameraRotation(a_Rotation);
+	}
+}
+
+}  // namespace blitz

src/blitz/protocol/ByteBuffer.cpp

@@ -0,0 +1,79 @@
+#include <blitz/protocol/ByteBuffer.h>
+
+#include <blitz/protocol/PacketData.h>
+
+namespace blitz {
+namespace protocol {
+
+#define Operators(Type, GodotType)                                                                                                    \
+	ByteBuffer& ByteBuffer::operator>>(Type& a_Data) {                                                                                \
+		if (sizeof(a_Data) + m_ReadOffset > m_Buffer.size()) {                                                                        \
+			throw ReadError("Buffer is too small ! Can't read " #Type);                                                               \
+		}                                                                                                                             \
+		a_Data = m_Buffer.decode_##GodotType(m_ReadOffset);                                                                           \
+		m_ReadOffset += sizeof(a_Data);                                                                                               \
+		return *this;                                                                                                                 \
+	}                                                                                                                                 \
+                                                                                                                                      \
+	ByteBuffer& ByteBuffer::operator<<(Type a_Data) {                                                                                 \
+		m_Buffer.resize(m_Buffer.size() + sizeof(a_Data));                                                                            \
+		m_Buffer.encode_##GodotType(m_Buffer.size() - sizeof(a_Data), a_Data);                                                        \
+		return *this;                                                                                                                 \
+	}
+
+// Integers
+Operators(int8_t, s8);
+Operators(uint8_t, u8);
+Operators(int16_t, s16);
+Operators(uint16_t, u16);
+Operators(int32_t, s32);
+Operators(uint32_t, u32);
+Operators(int64_t, s64);
+Operators(uint64_t, u64);
+
+// Reals
+Operators(float, float);
+Operators(double, double);
+
+ByteBuffer& ByteBuffer::operator>>(PlayerInfo& a_Data) {
+	*this >> a_Data.m_PlayerId >> a_Data.m_PlayerName;
+	return *this;
+}
+
+ByteBuffer& ByteBuffer::operator<<(const PlayerInfo& a_Data) {
+	*this << a_Data.m_PlayerId << a_Data.m_PlayerName;
+	return *this;
+}
+
+ByteBuffer& ByteBuffer::operator<<(const godot::Vector3& a_Data) {
+	*this << a_Data.x << a_Data.y << a_Data.z;
+	return *this;
+}
+
+ByteBuffer& ByteBuffer::operator>>(godot::Vector3& a_Data) {
+	*this >> a_Data.x >> a_Data.y >> a_Data.z;
+	return *this;
+}
+
+ByteBuffer& ByteBuffer::operator>>(godot::String& a_Data) {
+	int nullPos = m_Buffer.find(0, m_ReadOffset);
+	if (nullPos < 0)
+		throw ReadError("String does not have an and in buffer !");
+
+
+	godot::PackedByteArray stringBuffer = m_Buffer.slice(m_ReadOffset, nullPos);
+	a_Data = stringBuffer.get_string_from_utf8();
+	m_ReadOffset = nullPos + 1;
+	return *this;
+}
+
+ByteBuffer& ByteBuffer::operator<<(const godot::String& a_Data) {
+	godot::PackedByteArray stringBuffer = a_Data.to_utf8_buffer();
+	m_Buffer.append_array(stringBuffer);
+	// ends the string
+	*this << static_cast<std::uint8_t>(0);
+	return *this;
+}
+
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketDispatcher.cpp

@@ -0,0 +1,37 @@
+#include <blitz/protocol/PacketDispatcher.h>
+
+#include <algorithm>
+#include <blitz/protocol/PacketHandler.h>
+
+namespace blitz {
+namespace protocol {
+
+void PacketDispatcher::RegisterHandler(PacketType type, PacketHandler& handler) {
+	auto found = std::find(m_Handlers[type].begin(), m_Handlers[type].end(), &handler);
+	if (found == m_Handlers[type].end())
+		m_Handlers[type].push_back(&handler);
+}
+
+void PacketDispatcher::UnregisterHandler(PacketType type, PacketHandler& handler) {
+	m_Handlers[type].erase(std::remove(m_Handlers[type].begin(), m_Handlers[type].end(), &handler), m_Handlers[type].end());
+}
+
+void PacketDispatcher::UnregisterHandler(PacketHandler& handler) {
+	for (auto& pair : m_Handlers) {
+		if (pair.second.empty())
+			continue;
+
+		PacketType type = pair.first;
+
+		m_Handlers[type].erase(std::remove(m_Handlers[type].begin(), m_Handlers[type].end(), &handler), m_Handlers[type].end());
+	}
+}
+
+void PacketDispatcher::Dispatch(const Packet& packet) {
+	PacketType type = packet.GetType();
+	for (PacketHandler* handler : m_Handlers[type])
+		handler->Check(packet);
+}
+
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketFactory.cpp

@@ -0,0 +1,32 @@
+#include <blitz/protocol/PacketFactory.h>
+
+#include <array>
+#include <cassert>
+#include <functional>
+
+namespace blitz {
+namespace protocol {
+namespace PacketFactory {
+
+using PacketCreator = std::function<std::unique_ptr<Packet>()>;
+
+#define DeclarePacket(PacketName, ...) std::make_unique<packets::PacketName>(),
+
+static std::array<std::unique_ptr<Packet>, static_cast<std::size_t>(PacketType::PACKET_COUNT)> Packets;
+
+void Init() {
+	Packets = {
+
+		DeclareAllPacket()
+
+	};
+}
+
+const std::unique_ptr<Packet>& CreateReadOnlyPacket(PacketType a_Type) {
+	assert(a_Type < PacketType::PACKET_COUNT);
+	return Packets[static_cast<std::size_t>(a_Type)];
+}
+
+}  // namespace PacketFactory
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketHandler.cpp

@@ -0,0 +1,14 @@
+#include <blitz/protocol/PacketHandler.h>
+
+namespace blitz {
+namespace protocol {
+
+#define DeclarePacket(PacketName, ...)                                                                                                \
+	void PacketHandler::Visit(const packets::PacketName& a_Packet) {                                                                  \
+		HandlePacket(a_Packet);                                                                                                       \
+	}
+
+DeclareAllPacket()
+
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketSender.cpp

@@ -0,0 +1,39 @@
+#include <blitz/protocol/PacketSender.h>
+
+#include <blitz/godot/NetworkInterface.h>
+#include <blitz/protocol/PacketSerializer.h>
+
+namespace blitz {
+namespace protocol {
+
+///////////////////////
+/* PacketBroadcaster */
+///////////////////////
+
+#define DeclarePacket(PacketName, Reliability, ...)                                                                                   \
+	void PacketBroadcaster::Visit(const protocol::packets::PacketName& a_Packet) {                                                    \
+		m_NetworkInterface.rpc("RecievePacketData" #Reliability, protocol::PacketSerializer::Serialize(a_Packet));                    \
+	}
+
+DeclareAllPacket()
+
+#undef DeclarePacket
+
+
+
+
+
+//////////////////
+/* PacketSender */
+//////////////////
+#define DeclarePacket(PacketName, Reliability, ...)                                                                                   \
+	void PacketSender::Visit(const protocol::packets::PacketName& a_Packet) {                                                         \
+		m_NetworkInterface.rpc_id(m_PeerId, "RecievePacketData" #Reliability, protocol::PacketSerializer::Serialize(a_Packet));       \
+	}
+
+	DeclareAllPacket()
+
+#undef DeclarePacket
+
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketSerializer.cpp

@@ -0,0 +1,296 @@
+#include <blitz/protocol/PacketSerializer.h>
+
+#include <blitz/protocol/ByteBuffer.h>
+#include <blitz/protocol/PacketFactory.h>
+#include <blitz/protocol/PacketVisitor.h>
+
+#include <godot_cpp/variant/utility_functions.hpp>
+#include <godot_cpp/variant/variant.hpp>
+
+namespace blitz {
+namespace protocol {
+namespace PacketSerializer {
+
+#define DeclarePacket(PacketName, ...)                                                                                                \
+	void Visit(const packets::PacketName& a_Packet) override {                                                                        \
+		const auto& packetData = a_Packet.m_Data;                                                                                     \
+		SerializePacketData(packetData);                                                                                              \
+	}                                                                                                                                 \
+                                                                                                                                      \
+	void SerializePacketData(const packets::PacketName::PacketDataType& a_Packet);
+
+
+
+
+class Serializer : public PacketVisitor {
+  private:
+	ByteBuffer& m_Buffer;
+
+  public:
+	Serializer(ByteBuffer& a_Buffer) : m_Buffer(a_Buffer) {}
+
+	void Serialize(const Packet& a_Packet) {
+		m_Buffer << static_cast<PacketID>(a_Packet.GetType());
+		Check(a_Packet);
+	}
+
+	DeclareAllPacket()
+};
+
+#undef DeclarePacket
+
+
+
+
+
+#define DeclarePacket(PacketName, ...)                                                                                                \
+	void Visit(const packets::PacketName& a_Packet) override {                                                                        \
+		auto packetPtr = PacketFactory::CreatePacket<packets::PacketName>();                                                          \
+		auto& packetData = packetPtr->m_Data;                                                                                         \
+                                                                                                                                      \
+		DeserializePacketData(packetData);                                                                                            \
+                                                                                                                                      \
+		m_Packet = std::move(packetPtr);                                                                                              \
+	}                                                                                                                                 \
+                                                                                                                                      \
+	void DeserializePacketData(packets::PacketName::PacketDataType& a_Packet);
+
+
+
+class Deserializer : public PacketVisitor {
+  private:
+	ByteBuffer& m_Buffer;
+	PacketPtr m_Packet;
+
+  public:
+	Deserializer(ByteBuffer&& a_Buffer) : m_Buffer(a_Buffer) {}
+
+	bool Deserialize(const PacketPtr& a_Packet) {
+		try {
+			Check(*a_Packet.get());
+		} catch (ByteBuffer::ReadError& e) {
+			godot::UtilityFunctions::printerr("[PacketSerializer::Deserializer] ", e.what());
+			return false;
+		}
+		return true;
+	}
+
+	PacketPtr& GetPacket() {
+		return m_Packet;
+	}
+
+	DeclareAllPacket()
+};
+
+
+
+
+
+godot::PackedByteArray Serialize(const Packet& a_Packet) {
+	ByteBuffer stream;
+
+	Serializer serializer(stream);
+	serializer.Serialize(a_Packet);
+
+	return stream.GetByteArray();
+}
+
+std::unique_ptr<Packet> Deserialize(godot::PackedByteArray& a_Data) {
+	ByteBuffer stream(std::move(a_Data));
+
+	PacketID packetId;
+	stream >> packetId;
+
+	if (packetId >= static_cast<PacketID>(PacketType::PACKET_COUNT))
+		return nullptr;
+
+	PacketType packetType = PacketType(packetId);
+
+	// for double-dispatch
+	const PacketPtr& emptyPacket = PacketFactory::CreateReadOnlyPacket(packetType);
+
+	Deserializer deserializer(std::move(stream));
+
+	if (deserializer.Deserialize(emptyPacket)) {
+		PacketPtr packet = std::move(deserializer.GetPacket());
+		return packet;
+	}
+
+	return nullptr;
+}
+
+
+
+
+
+//---------------------------------------------
+// Packet serializer implementation
+//----------------------------------------------
+
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerLogin& a_Packet) {
+	m_Buffer << a_Packet.m_PlayerName;
+}
+
+void Deserializer::DeserializePacketData(data::PlayerLogin& a_Packet) {
+	m_Buffer >> a_Packet.m_PlayerName;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::UpdateHealth& a_Packet) {
+	m_Buffer << a_Packet.m_NewHealth;
+}
+
+void Deserializer::DeserializePacketData(data::UpdateHealth& a_Packet) {
+	m_Buffer >> a_Packet.m_NewHealth;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::LoggingSuccess& a_Packet) {
+	m_Buffer << a_Packet.m_PlayerId;
+}
+
+void Deserializer::DeserializePacketData(data::LoggingSuccess& a_Packet) {
+	m_Buffer >> a_Packet.m_PlayerId;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerDeath& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::PlayerDeath& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerJoin& a_Packet) {
+	m_Buffer << a_Packet.m_Player;
+}
+
+void Deserializer::DeserializePacketData(data::PlayerJoin& a_Packet) {
+	m_Buffer >> a_Packet.m_Player;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerLeave& a_Packet) {
+	m_Buffer << a_Packet.m_PlayerId;
+}
+
+void Deserializer::DeserializePacketData(data::PlayerLeave& a_Packet) {
+	m_Buffer >> a_Packet.m_PlayerId;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerList& a_Packet) {
+	m_Buffer << a_Packet.m_Players;
+	// m_Buffer << static_cast<std::uint8_t>(a_Packet.m_Players.size());
+	// for (auto player : a_Packet.m_Players) {
+	// 	m_Buffer << player.m_PlayerId << player.m_PlayerName;
+	// }
+}
+
+void Deserializer::DeserializePacketData(data::PlayerList& a_Packet) {
+	m_Buffer >> a_Packet.m_Players;
+	// std::uint8_t playerCount;
+	// m_Buffer >> playerCount;
+	// for (std::uint8_t i = 0; i < playerCount; i++) {
+	// 	PlayerInfo player;
+	// 	m_Buffer >> player.m_PlayerId >> player.m_PlayerName;
+	// 	a_Packet.m_Players.push_back(player);
+	// }
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerStats& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::PlayerStats& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::ServerConfig& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::ServerConfig& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::ServerTps& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::ServerTps& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::UpdateGameState& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::UpdateGameState& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::KeepAlive& a_Packet) {
+	m_Buffer << a_Packet.m_KeepAliveId;
+}
+
+void Deserializer::DeserializePacketData(data::KeepAlive& a_Packet) {
+	m_Buffer >> a_Packet.m_KeepAliveId;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::Disconnect& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::Disconnect& a_Packet) {}
+
+
+
+
+void Serializer::SerializePacketData(const data::ChatMessage& a_Packet) {
+	m_Buffer << a_Packet.m_Text;
+}
+
+void Deserializer::DeserializePacketData(data::ChatMessage& a_Packet) {
+	m_Buffer >> a_Packet.m_Text;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerPositionAndRotation& a_Packet) {
+	m_Buffer << a_Packet.m_Player << a_Packet.m_Position << a_Packet.m_Rotation;
+}
+
+void Deserializer::DeserializePacketData(data::PlayerPositionAndRotation& a_Packet) {
+	m_Buffer >> a_Packet.m_Player >> a_Packet.m_Position >> a_Packet.m_Rotation;
+}
+
+
+
+
+void Serializer::SerializePacketData(const data::PlayerShoot& a_Packet) {}
+
+void Deserializer::DeserializePacketData(data::PlayerShoot& a_Packet) {}
+
+
+
+
+
+}  // namespace PacketSerializer
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/PacketVisitor.cpp

@@ -0,0 +1,11 @@
+#include <blitz/protocol/PacketVisitor.h>
+
+namespace blitz {
+namespace protocol {
+
+void PacketVisitor::Check(const Packet& a_Packet) {
+	a_Packet.Accept(*this);
+}
+
+}  // namespace protocol
+}  // namespace blitz

src/blitz/protocol/Packets.cpp

@@ -0,0 +1,18 @@
+#define BLITZ_INSTANCIATE_PACKETS
+#include <blitz/protocol/Packets.h>
+
+#include <blitz/protocol/PacketVisitor.h>
+
+namespace blitz {
+namespace protocol {
+
+template <PacketType PT, typename Data>
+packets::ConcretePacket<PT, Data>::ConcretePacket(const PacketDataType& a_Data) : m_Data(a_Data) {}
+
+template <PacketType PT, typename Data>
+void packets::ConcretePacket<PT, Data>::Accept(PacketVisitor& a_Visitor) const {
+	a_Visitor.Visit(*this);
+}
+
+}  // namespace protocol
+}  // namespace blitz

src/client/ClientWorld.cpp

@@ -0,0 +1,39 @@
+#include <client/ClientWorld.h>
+
+#include <blitz/godot/NetworkInterface.h>
+#include <client/Player.h>
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/multiplayer_api.hpp>
+
+namespace blitz {
+
+using namespace godot;
+
+void ClientWorld::_bind_methods() {}
+
+ClientWorld::ClientWorld() {}
+
+ClientWorld::~ClientWorld() {}
+
+void ClientWorld::_process(float delta) {
+#if DEBUG_ENABLED
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+#endif
+	m_PassedTime += delta;
+	if (m_PassedTime < 0.05f)
+		return;
+
+
+	UpdatePlayerPos();
+}
+
+void ClientWorld::UpdatePlayerPos() {
+	Player* player = GetPlayerById(get_multiplayer()->get_unique_id());
+	if (player) {
+		m_NetworkInterface->BroadcastPacket(protocol::packets::PlayerPositionAndRotation(
+			{get_multiplayer()->get_unique_id(), player->get_position(), player->GetCameraRotation()}));
+	}
+}
+
+}  // namespace blitz

src/client/FirstPersonPlayer.cpp

@@ -1,10 +1,12 @@
-#include "FirstPersonPlayer.h"
+#include <client/FirstPersonPlayer.h>
 
+#include <godot_cpp/classes/camera3d.hpp>
 #include <godot_cpp/classes/engine.hpp>
 #include <godot_cpp/classes/input.hpp>
 #include <godot_cpp/classes/input_event_mouse_motion.hpp>
 #include <godot_cpp/classes/input_map.hpp>
 #include <godot_cpp/core/math.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
 
 using namespace godot;
 
@@ -32,6 +34,9 @@ static constexpr float FOV_TRANSITION = 8.0f;
 static constexpr float MIN_FOV_VELOCITY = 0.5;
 static constexpr float MAX_FOV_VELOCITY = SPRINT_SPEED * 2.0f;
 
+static const float LerpValue = 0.10;
+static const float AnimationBlend = 7.0;
+
 void FirstPersonPlayer::_bind_methods() {}
 
 FirstPersonPlayer::FirstPersonPlayer() : m_BobTime(0) {}
@@ -44,9 +49,9 @@ void FirstPersonPlayer::_ready() {
 		Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
 	}
 	m_Head = Object::cast_to<Node3D>(find_child("Head"));
-	DEV_ASSERT(m_Head);
 	m_Camera = Object::cast_to<Camera3D>(m_Head->find_child("Camera"));
-	DEV_ASSERT(m_Camera);
+	m_AnimationTree = Object::cast_to<AnimationTree>(find_child("AnimationTree"));
+	m_Mesh = Object::cast_to<Node3D>(find_child("Mesh"));
 }
 
 void FirstPersonPlayer::_unhandled_input(const godot::Ref<godot::InputEvent>& a_Event) {
@@ -84,6 +89,8 @@ void FirstPersonPlayer::_physics_process(float a_Delta) {
 	UpdateFOV(a_Delta);
 	UpdateBobbing(a_Delta);
 
+	UpdateAnimation(a_Delta);
+
 	move_and_slide();
 }
 
@@ -98,10 +105,11 @@ void FirstPersonPlayer::UpdateBobbing(float a_Delta) {
 
 void FirstPersonPlayer::UpdateCamera(const InputEventMouseMotion& a_Event) {
 	m_Head->rotate_y(-a_Event.get_relative().x * SENSITIVITY);
+	m_Mesh->rotate_y(-a_Event.get_relative().x * SENSITIVITY);
 	m_Camera->rotate_x(-a_Event.get_relative().y * SENSITIVITY);
 
 	float rotationX = m_Camera->get_rotation().x;
-	CLAMP(rotationX, Math::deg_to_rad(-40.0), Math::deg_to_rad(60.0));
+	rotationX = CLAMP(rotationX, Math::deg_to_rad(-80.0), Math::deg_to_rad(80.0));
 	m_Camera->set_rotation({rotationX, get_rotation().y, get_rotation().z});
 }
 
@@ -128,6 +136,14 @@ void FirstPersonPlayer::UpdatePosition(float delta) {
 			Math::lerp(static_cast<float>(get_velocity().z), static_cast<float>(direction.z * m_Speed),
 				static_cast<float>(delta * AIR_MOVEMENT))});
 	}
+
+
+	if (!direction.is_zero_approx()) {
+		godot::Vector3 newRotation = m_Mesh->get_rotation();
+		newRotation.y = godot::UtilityFunctions::lerp_angle(
+			newRotation.y, godot::UtilityFunctions::atan2(get_velocity().x, get_velocity().z), LerpValue);
+		m_Mesh->set_rotation(newRotation);
+	}
 }
 
 void FirstPersonPlayer::UpdateFOV(float a_Delta) {
@@ -136,4 +152,25 @@ void FirstPersonPlayer::UpdateFOV(float a_Delta) {
 	m_Camera->set_fov(Math::lerp(m_Camera->get_fov(), targetFOV, a_Delta * FOV_TRANSITION));
 }
 
+void FirstPersonPlayer::UpdateAnimation(float delta) {
+	if (is_on_floor()) {
+		m_AnimationTree->set("parameters/ground_air_transition/transition_request", "grounded");
+
+		if (get_velocity().length() > 0.2f) {
+			if (m_Speed == SPRINT_SPEED) {
+				m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+					UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), 1.0, delta * AnimationBlend));
+			} else {
+				m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+					UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), 0.0, delta * AnimationBlend));
+			}
+		} else {
+			m_AnimationTree->set("parameters/iwr_blend/blend_amount",
+				UtilityFunctions::lerp(m_AnimationTree->get("parameters/iwr_blend/blend_amount"), -1.0, delta * AnimationBlend));
+		}
+	} else {
+		m_AnimationTree->set("parameters/ground_air_transition/transition_request", "air");
+	}
+}
+
 }  // namespace blitz

src/client/Main.cpp

@@ -0,0 +1,42 @@
+#include <client/Main.h>
+
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/packed_scene.hpp>
+#include <godot_cpp/classes/resource_loader.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
+#include <godot_cpp/classes/window.hpp>
+#include <godot_cpp/variant/utility_functions.hpp>
+
+#include <client/ClientWorld.h>
+#include <server/ServerWorld.h>
+
+using namespace godot;
+
+namespace blitz {
+
+static constexpr char ClientWorldScenePath[] = "res://Scenes/Levels/client_world.tscn";
+static constexpr char ServerWorldScenePath[] = "res://Scenes/Levels/server_world.tscn";
+
+void Main::_bind_methods() {}
+
+void Main::_ready() {
+	auto* mainMenu = find_child("MainMenu");
+	DEV_ASSERT(mainMenu);
+	mainMenu->connect("change_scene_to_game", callable_mp(this, &Main::ChangeScene));
+}
+
+Main::Main() {}
+
+Main::~Main() {}
+
+void Main::ChangeScene(bool a_Server) {
+	Ref<PackedScene> sceneData;
+	if (a_Server)
+		sceneData = ResourceLoader::get_singleton()->load(ServerWorldScenePath);
+	else
+		sceneData = ResourceLoader::get_singleton()->load(ClientWorldScenePath);
+
+	add_child(sceneData->instantiate());
+}
+
+}  // namespace blitz

src/client/MainMenu.cpp

@@ -0,0 +1,81 @@
+#include <client/MainMenu.h>
+
+#include <godot_cpp/classes/engine.hpp>
+#include <godot_cpp/classes/multiplayer_api.hpp>
+#include <godot_cpp/classes/resource_loader.hpp>
+#include <godot_cpp/classes/scene_tree.hpp>
+
+using namespace godot;
+
+namespace blitz {
+
+void MainMenu::_bind_methods() {
+	godot::ClassDB::bind_method(godot::D_METHOD("on_connected"), &MainMenu::OnConnected);
+	ADD_SIGNAL(MethodInfo("change_scene_to_game", PropertyInfo(Variant::BOOL, "server")));
+}
+
+MainMenu::MainMenu() {}
+
+MainMenu::~MainMenu() {}
+
+void MainMenu::_ready() {
+	Node* container = find_child("Container");
+	DEV_ASSERT(container);
+
+	m_JoinButton = Object::cast_to<Button>(container->find_child("JoinButton"));
+	m_CreateButton = Object::cast_to<Button>(container->find_child("CreateButton"));
+	m_QuitButton = Object::cast_to<Button>(container->find_child("QuitButton"));
+
+	DEV_ASSERT(m_JoinButton);
+	DEV_ASSERT(m_CreateButton);
+	DEV_ASSERT(m_QuitButton);
+
+	m_JoinButton->connect("pressed", callable_mp(this, &MainMenu::OnJoinPressed));
+	m_CreateButton->connect("pressed", callable_mp(this, &MainMenu::OnCreatePressed));
+	m_QuitButton->connect("pressed", callable_mp(this, &MainMenu::OnQuitPressed));
+
+
+	if (!Engine::get_singleton()->is_editor_hint()) {
+		m_NetworkInterface = Object::cast_to<NetworkInterface>(get_parent()->find_child("Network"));
+		DEV_ASSERT(m_NetworkInterface);
+
+		m_NetworkInterface->connect("local_player_connected", callable_mp(this, &MainMenu::OnConnected));
+		m_NetworkInterface->connect("server_disconnected", callable_mp(this, &MainMenu::OnDisconnected));
+	}
+}
+
+void MainMenu::OnConnected() {
+	emit_signal("change_scene_to_game", get_multiplayer()->is_server());
+	set_visible(false);
+}
+
+void MainMenu::OnDisconnected() {
+	set_visible(true);
+	EnableButtons();
+}
+
+void MainMenu::OnJoinPressed() {
+	DisableButtons();
+	m_NetworkInterface->JoinGame("localhost", 25565);
+}
+
+void MainMenu::OnCreatePressed() {
+	DisableButtons();
+	m_NetworkInterface->CreateGame(25565);
+}
+
+void MainMenu::OnQuitPressed() {
+	get_tree()->quit();
+}
+
+void MainMenu::DisableButtons() {
+	m_JoinButton->set_disabled(true);
+	m_CreateButton->set_disabled(true);
+}
+
+void MainMenu::EnableButtons() {
+	m_JoinButton->set_disabled(false);
+	m_CreateButton->set_disabled(false);
+}
+
+}  // namespace blitz

src/client/Player.cpp

@@ -1,4 +1,4 @@
-#include "Player.h"
+#include <client/Player.h>
 
 #include <godot_cpp/classes/engine.hpp>
 #include <godot_cpp/classes/input.hpp>
@@ -16,18 +16,19 @@ static const float AnimationBlend = 7.0;
 
 namespace blitz {
 
+using namespace godot;
+
 void Player::_bind_methods() {}
 
 Player::Player() {}
+
 Player::~Player() {}
 
 void Player::_ready() {
 	godot::InputMap::get_singleton()->load_from_project_settings();
-	m_PlayerMesh = Object::cast_to<godot::Node3D>(get_child(0));
-	m_SpringArmPivot = Object::cast_to<godot::Node3D>(get_child(2));
-	m_AnimationTree = Object::cast_to<godot::AnimationTree>(get_child(4));
-	DEV_ASSERT(m_PlayerMesh);
-	DEV_ASSERT(m_SpringArmPivot);
+	m_Mesh = Object::cast_to<godot::Node3D>(find_child("Mesh"));
+	m_AnimationTree = Object::cast_to<godot::AnimationTree>(find_child("AnimationTree"));
+	DEV_ASSERT(m_Mesh);
 	DEV_ASSERT(m_AnimationTree);
 
 	apply_floor_snap();
@@ -38,50 +39,6 @@ void Player::_physics_process(float delta) {
 	if (godot::Engine::get_singleton()->is_editor_hint())
 		return;
 
-
-	auto* Input = godot::Input::get_singleton();
-	godot::Vector3 move_direction{0, 0, 0};
-	move_direction.x = Input->get_action_strength("move_right") - Input->get_action_strength("move_left");
-	move_direction.z = Input->get_action_strength("move_backwards") - Input->get_action_strength("move_forwards");
-	move_direction = move_direction.rotated({0, 1, 0}, m_SpringArmPivot->get_rotation().y);
-
-	godot::Vector3 newVelocity = get_velocity();
-	newVelocity.y -= Gravity * delta;
-	set_velocity(newVelocity);
-
-
-
-	if (Input->is_action_pressed("run"))
-		m_Speed = RunSpeed;
-	else
-		m_Speed = WalkSpeed;
-
-	newVelocity = get_velocity();
-	newVelocity.x = move_direction.x * m_Speed;
-	newVelocity.z = move_direction.z * m_Speed;
-	set_velocity(newVelocity);
-
-	if (move_direction != godot::Vector3{0, 0, 0}) {
-		godot::Vector3 newRotation = m_PlayerMesh->get_rotation();
-		newRotation.y = godot::UtilityFunctions::lerp_angle(
-			newRotation.y, godot::UtilityFunctions::atan2(get_velocity().x, get_velocity().z), LerpValue);
-		m_PlayerMesh->set_rotation(newRotation);
-	}
-
-	bool justLanded = is_on_floor() && m_SnapVector == godot::Vector3{0, 0, 0};
-	bool isJumping = is_on_floor() && Input->is_action_just_pressed("jump");
-
-	if (isJumping) {
-		newVelocity = get_velocity();
-		newVelocity.y = JumpStrength;
-		set_velocity(newVelocity);
-		m_SnapVector.zero();
-	} else if (justLanded) {
-		m_SnapVector = {0, -1, 0};
-	}
-
-	apply_floor_snap();
-	move_and_slide();
 	animate(delta);
 }
 
@@ -108,4 +65,13 @@ void Player::animate(float delta) {
 		m_AnimationTree->set("parameters/ground_air_transition/transition_request", "air");
 	}
 }
+
+Vector3 Player::GetCameraRotation() const {
+	return m_Mesh->get_rotation();
+}
+
+void Player::SetCameraRotation(const Vector3& a_Rotation) {
+	m_Mesh->set_rotation(a_Rotation);
+}
+
 }  // namespace blitz

src/client/register_types.cpp

@@ -0,0 +1,51 @@
+#include <blitz/godot/NetworkInterface.h>
+#include <client/ClientWorld.h>
+#include <client/FirstPersonPlayer.h>
+#include <client/Main.h>
+#include <client/MainMenu.h>
+#include <client/Player.h>
+#include <server/Server.h>
+#include <server/ServerWorld.h>
+
+#include <gdextension_interface.h>
+#include <godot_cpp/core/defs.hpp>
+#include <godot_cpp/godot.hpp>
+
+using namespace godot;
+
+static void RegisterClasses() {
+	GDREGISTER_CLASS(blitz::Player);
+	GDREGISTER_CLASS(blitz::FirstPersonPlayer);
+	GDREGISTER_CLASS(blitz::MainMenu);
+	GDREGISTER_CLASS(blitz::Main);
+	GDREGISTER_CLASS(blitz::NetworkInterface);
+	GDREGISTER_CLASS(blitz::Server);
+	GDREGISTER_ABSTRACT_CLASS(blitz::World);
+	GDREGISTER_CLASS(blitz::ClientWorld);
+	GDREGISTER_CLASS(blitz::ServerWorld);
+}
+
+static void initialize_blitz_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+
+	RegisterClasses();
+}
+
+static void uninitialize_blitz_module(ModuleInitializationLevel p_level) {
+	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
+		return;
+	}
+}
+
+extern "C" GDExtensionBool GDE_EXPORT library_init(GDExtensionInterfaceGetProcAddress p_get_proc,
+	const GDExtensionClassLibraryPtr p_library, GDExtensionInitialization* r_initialization) {
+	godot::GDExtensionBinding::InitObject init_obj(p_get_proc, p_library, r_initialization);
+
+	init_obj.register_initializer(initialize_blitz_module);
+	init_obj.register_terminator(uninitialize_blitz_module);
+	init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_SCENE);
+
+	return init_obj.init();
+}

src/register_types.cpp

@@ -1,38 +0,0 @@
-#include "register_types.h"
-
-#include "FirstPersonPlayer.h"
-#include "Player.h"
-#include "SpringArmPivot.h"
-
-#include <gdextension_interface.h>
-#include <godot_cpp/core/defs.hpp>
-#include <godot_cpp/godot.hpp>
-
-using namespace godot;
-
-void initialize_example_module(ModuleInitializationLevel p_level) {
-	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
-		return;
-	}
-
-	ClassDB::register_class<blitz::Player>();
-	ClassDB::register_class<blitz::SpringArmPivot>();
-	ClassDB::register_class<blitz::FirstPersonPlayer>();
-}
-
-void uninitialize_example_module(ModuleInitializationLevel p_level) {
-	if (p_level != MODULE_INITIALIZATION_LEVEL_SCENE) {
-		return;
-	}
-}
-
-extern "C" GDExtensionBool GDE_EXPORT library_init(GDExtensionInterfaceGetProcAddress p_get_proc,
-	const GDExtensionClassLibraryPtr p_library, GDExtensionInitialization* r_initialization) {
-	godot::GDExtensionBinding::InitObject init_obj(p_get_proc, p_library, r_initialization);
-
-	init_obj.register_initializer(initialize_example_module);
-	init_obj.register_terminator(uninitialize_example_module);
-	init_obj.set_minimum_library_initialization_level(MODULE_INITIALIZATION_LEVEL_SCENE);
-
-	return init_obj.init();
-}

src/register_types.h

@@ -1,11 +0,0 @@
-#ifndef GDEXAMPLE_REGISTER_TYPES_H
-#define GDEXAMPLE_REGISTER_TYPES_H
-
-#include <godot_cpp/core/class_db.hpp>
-
-using namespace godot;
-
-void initialize_example_module(ModuleInitializationLevel p_level);
-void uninitialize_example_module(ModuleInitializationLevel p_level);
-
-#endif

src/server/Server.cpp

@@ -0,0 +1,42 @@
+#include <server/Server.h>
+
+#include <blitz/godot/NetworkInterface.h>
+#include <godot_cpp/classes/engine.hpp>
+
+using namespace godot;
+
+namespace blitz {
+
+void Server::_bind_methods() {}
+
+Server::Server() {}
+
+Server::~Server() {}
+
+void Server::_ready() {
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+
+
+	m_NetworkInterface = Object::cast_to<NetworkInterface>(get_parent());
+	DEV_ASSERT(m_NetworkInterface);
+
+	m_NetworkInterface->connect("player_connected", callable_mp(this, &Server::OnPlayerConnect));
+	m_NetworkInterface->connect("player_disconnected", callable_mp(this, &Server::OnPlayerDisconnect));
+}
+
+void Server::OnPlayerConnect(PeerID a_PeerId) {
+	protocol::PlayerInfo playerInfo{a_PeerId, "whoami"};
+	for (int i = 0; i < m_Peers.size(); i++) {
+		m_NetworkInterface->SendPacket(a_PeerId, protocol::packets::PlayerJoin({m_Peers[i], "whoami"}));
+	}
+	m_Peers.push_back(a_PeerId);
+	m_NetworkInterface->BroadcastPacket(protocol::packets::PlayerJoin({playerInfo}));
+}
+
+void Server::OnPlayerDisconnect(PeerID a_PeerId) {
+	m_Peers.erase(a_PeerId);
+	m_NetworkInterface->BroadcastPacket(protocol::packets::PlayerLeave({a_PeerId}));
+}
+
+}  // namespace blitz

src/server/ServerWorld.cpp

@@ -0,0 +1,38 @@
+#include <server/ServerWorld.h>
+
+#include <blitz/godot/NetworkInterface.h>
+#include <client/Player.h>
+#include <godot_cpp/classes/engine.hpp>
+
+namespace blitz {
+
+using namespace godot;
+
+void ServerWorld::_bind_methods() {}
+
+ServerWorld::ServerWorld() {}
+
+ServerWorld::~ServerWorld() {}
+
+void ServerWorld::_process(float delta) {
+#if DEBUG_ENABLED
+	if (Engine::get_singleton()->is_editor_hint())
+		return;
+#endif
+	m_PassedTime += delta;
+	if (m_PassedTime < 0.05f)
+		return;
+
+	SyncPlayersPos();
+}
+
+void ServerWorld::SyncPlayersPos() {
+	for (int i = 0; i < m_Players->get_child_count(); i++) {
+		Player* player = Object::cast_to<Player>(m_Players->get_child(i));
+		DEV_ASSERT(player);
+		m_NetworkInterface->BroadcastPacket(
+			protocol::packets::PlayerPositionAndRotation({player->GetId(), player->get_position(), player->GetCameraRotation()}));
+	}
+}
+
+}  // namespace blitz

xmake/godot.lua

@@ -16,7 +16,7 @@ add_rules("mode.debug", "mode.release")
 set_languages("c++20")
 
 -- use latest 4.x version by default
-add_requires("godotcpp4")
+add_requires("godotcpp4 4.2")
 
 
 includes("tasks.lua")

xmake/target.lua

@@ -14,6 +14,8 @@ target(PROJECT_NAME)
     -- more on https://xmake.io/#/manual/project_target?id=targetadd_files
     add_files("../src/**.cpp")
 
+    add_includedirs("../include")
+
     -- change the output name
     set_basename(PROJECT_NAME .. ".$(os)_$(mode)_$(arch)")