implement player poses (sneak/sprint)

* Added sending player metadata with poses to everyone

* Renamed sendPlayerMetadataToAll to broadcastPlayerMetadata

* Made entity metadata system flexible

* Made broadcastPlayerMetadata create new metadata instead of using a global one

* Moved writeEntityData, sizeEntityData and sizeEntityMetadata to procedures

* style nitpicks

---------

Co-authored-by: p2r3 <p2r3@p2r3.com>

include/globals.h

@@ -248,6 +248,19 @@ typedef struct {
 
 #pragma pack(pop)
 
+union EntityDataValue {
+  uint8_t byte;
+  int pose;
+};
+
+typedef struct {
+  uint8_t index;
+  // 0 - Byte
+  // 21 - Pose
+  int type;
+  union EntityDataValue value;
+} EntityData;
+
 extern BlockChange block_changes[MAX_BLOCK_CHANGES];
 extern int block_changes_count;
 

include/packets.h

@@ -48,6 +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_setEntityMetadata (int client_fd, int id, EntityData *metadata, size_t length);
 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);

include/procedures.h

@@ -20,6 +20,8 @@ void disconnectClient (int *client_fd, int cause);
 int givePlayerItem (PlayerData *player, uint16_t item, uint8_t count);
 void spawnPlayer (PlayerData *player);
 
+void broadcastPlayerMetadata (PlayerData *player);
+
 uint8_t serverSlotToClientSlot (int window_id, uint8_t slot);
 uint8_t clientSlotToServerSlot (int window_id, uint8_t slot);
 
@@ -47,4 +49,9 @@ void handleServerTick (int64_t time_since_last_tick);
 
 void broadcastChestUpdate (int origin_fd, uint8_t *storage_ptr, uint16_t item, uint8_t count, uint8_t slot);
 
+ssize_t writeEntityData (int client_fd, EntityData *data);
+
+int sizeEntityData (EntityData *data);
+int sizeEntityMetadata (EntityData *metadata, size_t length);
+
 #endif