Allow syncing player animation state

Closes ynoproject#80 (pending server PR)

Author: Desdaemon

src/game_character.h

@@ -1151,6 +1151,8 @@ inline bool Game_Character::IsAnimPaused() const {
 }
 
 inline void Game_Character::SetAnimPaused(bool value) {
+	if (GetType() == Player && data()->anim_paused != value)
+		GMI().MainPlayerChangedAnimState(value);
 	data()->anim_paused = value;
 }
 

src/multiplayer/game_multiplayer.cpp

@@ -345,6 +345,18 @@ void Game_Multiplayer::InitConnection() {
 		}
 		Web_API::OnPlayerSystemUpdated(p.name, p.id);
 	});
+	connection.RegisterHandler<AnimCtrlPacket>("anc", [this] (AnimCtrlPacket& p) {
+		if (players.find(p.id) == players.end()) return;
+		auto& player = players[p.id];
+		switch (p.cmd) {
+		case Messages::AnimStart:
+			player.ch->SetAnimPaused(false);
+			break;
+		case Messages::AnimStop:
+			player.ch->SetAnimPaused(true);
+			break;
+		}
+	});
 	connection.RegisterHandler<SEPacket>("se", [this] (SEPacket& p) {
 		if (players.find(p.id) == players.end()) return;
 		if (settings.enable_sounds) {
@@ -634,6 +646,11 @@ void Game_Multiplayer::MainPlayerTriggeredEvent(int event_id, bool action) {
 	}
 }
 
+void Game_Multiplayer::MainPlayerChangedAnimState(bool stopping) {
+	auto msg = stopping ? Messages::AnimStop : Messages::AnimStart;
+	connection.SendPacketAsync<Messages::C2S::AnimCtrlPacket>(msg);
+}
+
 void Game_Multiplayer::SystemGraphicChanged(std::string_view sys) {
 	connection.SendPacketAsync<SysNamePacket>(ToString(sys));
 	Web_API::OnUpdateSystemGraphic(ToString(sys));

src/multiplayer/game_multiplayer.h

@@ -33,6 +33,7 @@ class Game_Multiplayer {
 	void MainPlayerChangedSpriteHidden(bool hidden);
 	void MainPlayerTeleported(int map_id, int x, int y);
 	void MainPlayerTriggeredEvent(int event_id, bool action);
+	void MainPlayerChangedAnimState(bool stopping);
 	void SystemGraphicChanged(std::string_view sys);
 	void SePlayed(const lcf::rpg::Sound& sound);
 	bool IsPictureSynced(int pic_id, std::string_view pic_name);

src/multiplayer/messages.h

@@ -8,6 +8,12 @@
 #include "../game_pictures.h"
 
 namespace Messages {
+
+enum AnimCommands {
+	AnimStop,
+	AnimStart,
+};
+
 namespace S2C {
 	using S2CPacket = Multiplayer::S2CPacket;
 	using PL = Multiplayer::Connection::ParameterList;
@@ -186,6 +192,14 @@ namespace S2C {
 		const std::string name;
 	};
 
+	class AnimCtrlPacket : public PlayerPacket {
+	public:
+		AnimCtrlPacket(const PL& v)
+			: PlayerPacket(v.at(0)),
+				cmd((AnimCommands) Decode<int>(v.at(1))) {}
+		const AnimCommands cmd;
+	};
+
 	class SEPacket : public PlayerPacket {
 	public:
 		static lcf::rpg::Sound BuildSound(const PL& v) {
@@ -439,6 +453,14 @@ namespace C2S {
 		int spd;
 	};
 
+	class AnimCtrlPacket : public C2SPacket {
+	public:
+		AnimCtrlPacket(AnimCommands _cmd) : C2SPacket("anc"), cmd(_cmd) {}
+		std::string ToBytes() const override { return Build((int) cmd); }
+	protected:
+		AnimCommands cmd;
+	};
+
 	class SpritePacket : public C2SPacket {
 	public:
 		SpritePacket(std::string _n, int _i) : C2SPacket("spr"),