add inventory structure

src/inventory.rs

@@ -1,3 +1,45 @@
+#[derive(Clone)]
 pub struct Weapon {
-
+    id: u16,
+    level: u16,
+    experience: u16,
+    ammo: u16,
+    max_ammo: u16,
+}
+
+#[derive(Clone, Copy)]
+pub struct Item(u16);
+
+#[derive(Clone)]
+pub struct Inventory {
+    current_item: u16,
+    current_weapon: u16,
+    items: Vec<Item>,
+    weapons: Vec<Weapon>,
+}
+
+impl Inventory {
+    #[allow(clippy::new_without_default)]
+    pub fn new() -> Inventory {
+        Inventory {
+            current_item: 0,
+            current_weapon: 0,
+            items: Vec::with_capacity(16),
+            weapons: Vec::with_capacity(16),
+        }
+    }
+
+    pub fn add_item(&mut self, item_id: u16) {
+        if !self.has_item(item_id) {
+            self.items.push(Item(item_id));
+        }
+    }
+
+    pub fn remove_item(&mut self, item_id: u16) {
+        self.items.retain(|item| item.0 != item_id);
+    }
+
+    pub fn has_item(&self, item_id: u16) -> bool {
+        self.items.iter().any(|item| item.0 == item_id)
+    }
 }

src/main.rs

@@ -67,7 +67,7 @@ mod sound;
 mod text_script;
 mod texture_set;
 mod ui;
-mod weapon;
+mod inventory;
 
 struct Game {
     scene: Option<Box<dyn Scene>>,

src/player.rs

@@ -10,6 +10,7 @@ use crate::frame::Frame;
 use crate::ggez::{Context, GameResult};
 use crate::SharedGameState;
 use crate::str;
+use crate::inventory::Inventory;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[repr(u8)]
@@ -31,6 +32,7 @@ pub struct Player {
     pub cond: Condition,
     pub flags: Flag,
     pub equip: Equipment,
+    pub inventory: Inventory,
     pub direction: Direction,
     pub display_bounds: Rect<usize>,
     pub hit_bounds: Rect<usize>,
@@ -70,6 +72,7 @@ impl Player {
             cond: Condition(0x80),
             flags: Flag(0),
             equip: Equipment(0),
+            inventory: Inventory::new(),
             direction: Direction::Right,
             display_bounds: constants.my_char.display_bounds,
             hit_bounds: constants.my_char.hit_bounds,