feat(wip): add ecs

Author: mdssjc

books/hands-on-rust/dungeoncrawl/Cargo.toml

@@ -7,3 +7,4 @@ edition = "2021"
 
 [dependencies]
 bracket-lib = "~0.8.1"
+legion = "=0.3.1"

books/hands-on-rust/dungeoncrawl/src/components.rs

@@ -0,0 +1,10 @@
+pub use crate::prelude::*;
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Render {
+    pub color: ColorPair,
+    pub glyph: FontCharType,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Player;

books/hands-on-rust/dungeoncrawl/src/main.rs

@@ -1,35 +1,45 @@
 mod camera;
+mod components;
 mod map;
 mod map_builder;
-mod player;
+mod spawner;
+mod systems;
 mod prelude {
     pub use bracket_lib::prelude::*;
+    pub use legion::systems::CommandBuffer;
+    pub use legion::world::SubWorld;
+    pub use legion::*;
     pub const SCREEN_WIDTH: i32 = 80;
     pub const SCREEN_HEIGHT: i32 = 50;
+    pub const DISPLAY_WIDTH: i32 = SCREEN_WIDTH / 2;
+    pub const DISPLAY_HEIGHT: i32 = SCREEN_HEIGHT / 2;
     pub use crate::camera::*;
+    pub use crate::components::*;
     pub use crate::map::*;
     pub use crate::map_builder::*;
-    pub use crate::player::*;
-    pub const DISPLAY_WIDTH: i32 = SCREEN_WIDTH / 2;
-    pub const DISPLAY_HEIGHT: i32 = SCREEN_HEIGHT / 2;
+    pub use crate::spawner::*;
+    pub use crate::systems::*;
 }
 
 use prelude::*;
 
 struct State {
-    map: Map,
-    player: Player,
-    camera: Camera,
+    ecs: World,
+    systems: Schedule,
 }
 
 impl State {
     fn new() -> Self {
+        let mut ecs = World::default();
+        let mut resources = Resources::default();
         let mut rng = RandomNumberGenerator::new();
         let map_builder = MapBuilder::new(&mut rng);
+        spawn_player(&mut ecs, map_builder.player_start);
+        resources.insert(map_builder.map);
+        resources.insert(Camera::new(map_builder.player_start));
         Self {
-            map: map_builder.map,
-            player: Player::new(map_builder.player_start),
-            camera: Camera::new(map_builder.player_start),
+            ecs,
+            systems: build_scheduler(),
         }
     }
 }
@@ -40,9 +50,8 @@ impl GameState for State {
         ctx.cls();
         ctx.set_active_console(1);
         ctx.cls();
-        self.player.update(ctx, &self.map, &mut self.camera);
-        self.map.render(ctx, &self.camera);
-        self.player.render(ctx, &self.camera);
+        self.resources.insert(ctx.key);
+        self.systems.execute(&mut self.ecs, &mut self.resources);
     }
 }
 

books/hands-on-rust/dungeoncrawl/src/player.rs

@@ -0,0 +1,12 @@
+use crate::prelude::*;
+
+pub fn spawn_player(ecs: &mut World, pos: Point) {
+    ecs.push((
+        Player,
+        pos,
+        Render {
+            color: ColorPair::new(WHITE, BLACK),
+            glyph: to_cp437('@'),
+        },
+    ));
+}

books/hands-on-rust/dungeoncrawl/src/spawner.rs

@@ -0,0 +1,5 @@
+use crate::prelude::*;
+
+pub fn build_scheduler() -> Schedule {
+    Schedule::builder().build()
+}