From f6333429eba6269d19498eb9eddc6f49be0ed9f9 Mon Sep 17 00:00:00 2001
From: SDFTDusername <85052868+SDFTDusername@users.noreply.github.com>
Date: Sun, 14 Sep 2025 15:59:25 +0200
Subject: [PATCH] implement arm swinging animation

* Added packets to show players swinging their arms

* fix misleading comment

---------

Co-authored-by: p2r3 <p2r3@p2r3.com>
---
 include/packets.h |  2 ++
 src/main.c        |  4 ++++
 src/packets.c     | 48 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+)

diff --git a/include/packets.h b/include/packets.h
index fa0eaa1..4d3b36c 100644
--- a/include/packets.h
+++ b/include/packets.h
@@ -14,6 +14,7 @@ int cs_setPlayerPosition (int client_fd, double *x, double *y, double *z, uint8_
 int cs_setPlayerRotation (int client_fd, float *yaw, float *pitch, uint8_t *on_ground);
 int cs_setPlayerMovementFlags (int client_fd, uint8_t *on_ground);
 int cs_setHeldItem (int client_fd);
+int cs_swingArm (int client_fd);
 int cs_clickContainer (int client_fd);
 int cs_closeContainer (int client_fd);
 int cs_clientStatus (int client_fd);
@@ -47,6 +48,7 @@ int sc_acknowledgeBlockChange (int client_fd, int sequence);
 int sc_playerInfoUpdateAddPlayer (int client_fd, PlayerData player);
 int sc_spawnEntity (int client_fd, int id, uint8_t *uuid, int type, double x, double y, double z, uint8_t yaw, uint8_t pitch);
 int sc_spawnEntityPlayer (int client_fd, PlayerData player);
+int sc_entityAnimation (int client_fd, int id, uint8_t animation);
 int sc_teleportEntity (int client_fd, int id, double x, double y, double z, float yaw, float pitch);
 int sc_setHeadRotation (int client_fd, int id, uint8_t yaw);
 int sc_updateEntityRotation (int client_fd, int id, uint8_t yaw, uint8_t pitch);
diff --git a/src/main.c b/src/main.c
index 0e36da5..a489810 100644
--- a/src/main.c
+++ b/src/main.c
@@ -437,6 +437,10 @@ void handlePacket (int client_fd, int length, int packet_id, int state) {
     case 0x34:
       if (state == STATE_PLAY) cs_setHeldItem(client_fd);
       break;
+	
+    case 0x3C:
+      if (state == STATE_PLAY) cs_swingArm(client_fd);
+      break;
 
     case 0x28:
       if (state == STATE_PLAY) cs_playerAction(client_fd);
diff --git a/src/packets.c b/src/packets.c
index e712d6b..8fd13a4 100644
--- a/src/packets.c
+++ b/src/packets.c
@@ -762,6 +762,43 @@ int cs_setPlayerMovementFlags (int client_fd, uint8_t *on_ground) {
   return 0;
 }
 
+// C->S Swing Arm (serverbound)
+int cs_swingArm (int client_fd) {
+
+  PlayerData *player;
+  if (getPlayerData(client_fd, &player)) return 1;
+
+  uint8_t hand = readVarInt(client_fd);
+
+  uint8_t animation = 255;
+  switch (hand) {
+    case 0: {
+      animation = 0;
+      break;
+    }
+    case 1: {
+      animation = 2;
+      break;
+    }
+  }
+
+  if (animation == 255)
+    return 1;
+
+  // Forward animation to all connected players
+  for (int i = 0; i < MAX_PLAYERS; i ++) {
+    PlayerData* other_player = &player_data[i];
+
+    if (other_player->client_fd == -1) continue;
+    if (other_player->client_fd == player->client_fd) continue;
+    if (other_player->flags & 0x20) continue;
+
+    sc_entityAnimation(other_player->client_fd, player->client_fd, animation);
+  }
+
+  return 0;
+}
+
 // C->S Set Held Item (serverbound)
 int cs_setHeldItem (int client_fd) {
 
@@ -880,6 +917,17 @@ int sc_spawnEntityPlayer (int client_fd, PlayerData player) {
   );
 }
 
+// S->C Entity Animation
+int sc_entityAnimation (int client_fd, int id, uint8_t animation) {
+  writeVarInt(client_fd, 2 + sizeVarInt(id));
+  writeByte(client_fd, 0x02);
+
+  writeVarInt(client_fd, id); // Entity ID
+  writeByte(client_fd, animation); // Animation
+
+  return 0;
+}
+
 // S->C Teleport Entity
 int sc_teleportEntity (
   int client_fd, int id,