introduce local player

src/objects/Players.cpp

@@ -20,10 +20,19 @@ Player* Players::get(int64_t id) const {
     return found->second.get();
 }
 
-Player* Players::create() {
+Player* Players::create(int64_t id) {
+    int64_t& nextPlayerID = level.getWorld()->getInfo().nextPlayerId;
+    if (id == NONE) {
+        id = nextPlayerID++;
+    } else {
+        if (auto player = get(id)) {
+            return player;
+        }
+        nextPlayerID = std::max(id + 1, nextPlayerID);
+    }
     auto playerPtr = std::make_unique<Player>(
         level,
-        level.getWorld()->getInfo().nextPlayerId++,
+        id,
         "",
         glm::vec3(0, DEF_PLAYER_Y, 0),
         DEF_PLAYER_SPEED,

src/objects/Players.hpp

@@ -14,6 +14,9 @@ class Level;
 class Player;
 
 class Players : public Serializable {
+public:
+    static inline int64_t NONE = -1;
+private:
     Level& level;
     std::unordered_map<int64_t, std::unique_ptr<Player>> players;
 
@@ -23,7 +26,7 @@ public:
 
     Player* get(int64_t id) const;
 
-    Player* create();
+    Player* create(int64_t id=NONE);
 
     void suspend(int64_t id);