implement scene loader (transformations are still a bit wonky)

src/cmd.rs

@@ -27,13 +27,22 @@ pub struct CmdPlugin;
 impl Plugin for CmdPlugin {
     fn build(&self, app: &mut App) {
         app.add_systems(Startup, load_defs);
+        app.add_systems(
+            Update,
+            handle_spawn_events
+                .before(spawn_entities)
+                .before(spawn_scenes),
+        );
         app.add_systems(Update, spawn_entities);
+        app.add_systems(Update, spawn_scenes.after(spawn_entities));
         app.add_systems(Update, process_mesh);
         app.add_systems(
             PreUpdate,
             hide_colliders.run_if(any_with_component::<NeedsSceneColliderRemoved>),
         );
         app.add_event::<SpawnEvent>();
+        app.add_event::<SpawnActorEvent>();
+        app.add_event::<SpawnSceneEvent>();
     }
 }
 
@@ -41,9 +50,14 @@ impl Plugin for CmdPlugin {
 pub struct NeedsSceneColliderRemoved;
 #[derive(Event)]
 pub struct SpawnEvent(ParserState);
+#[derive(Event)]
+pub struct SpawnActorEvent(ParserState);
+#[derive(Event)]
+pub struct SpawnSceneEvent(ParserState);
 #[derive(PartialEq, Clone)]
 enum DefClass {
     Actor,
+    Scene,
     None,
 }
 
@@ -347,6 +361,21 @@ pub fn load_defs(mut ew_spawn: EventWriter<SpawnEvent>) {
                     continue;
                 }
             }
+            ["scene", x, y, z, name] => {
+                ew_spawn.send(SpawnEvent(state));
+                state = ParserState::default();
+                state.class = DefClass::Scene;
+                state.name = Some(name.to_string());
+                if let (Ok(x_float), Ok(y_float), Ok(z_float)) =
+                    (x.parse::<f64>(), y.parse::<f64>(), z.parse::<f64>())
+                {
+                    state.pos = DVec3::new(x_float, y_float, z_float);
+                } else {
+                    error!("Can't parse coordinates as floats in def: {line}");
+                    state = ParserState::default();
+                    continue;
+                }
+            }
             ["relativeto", id] => {
                 state.relative_to = Some(id.to_string());
             }
@@ -646,8 +675,90 @@ pub fn load_defs(mut ew_spawn: EventWriter<SpawnEvent>) {
     ew_spawn.send(SpawnEvent(state));
 }
 
-fn spawn_entities(
+fn handle_spawn_events(
     mut er_spawn: EventReader<SpawnEvent>,
+    mut ew_spawnscene: EventWriter<SpawnSceneEvent>,
+    mut ew_spawnactor: EventWriter<SpawnActorEvent>,
+) {
+    for state in er_spawn.read() {
+        match state.0.class {
+            DefClass::Actor => {
+                ew_spawnactor.send(SpawnActorEvent(state.0.clone()));
+            }
+            DefClass::Scene => {
+                ew_spawnscene.send(SpawnSceneEvent(state.0.clone()));
+            }
+            DefClass::None => {}
+        }
+    }
+}
+
+fn spawn_scenes(
+    mut er_spawnscene: EventReader<SpawnSceneEvent>,
+    mut ew_spawn: EventWriter<SpawnEvent>,
+) {
+    for state_wrapper in er_spawnscene.read() {
+        let root_state = &state_wrapper.0;
+
+        let scene_defs = include!("data/scenes.in");
+        for (name, template, pos, rot) in scene_defs {
+            if Some(name.to_string()) == root_state.name {
+                match template {
+                    "cruiser" => {
+                        let mut state = ParserState::default();
+                        state.class = DefClass::Actor;
+                        state.pos = DVec3::new(pos[0], -pos[2], pos[1]);
+                        state.model = Some("cruiser".to_string());
+
+                        state.rotation = Quat::from_euler(EulerRot::XYZ, rot[0], rot[1], rot[2]);
+
+                        // command: relativeto ?
+                        state.relative_to = root_state.relative_to.clone();
+
+                        // command: name Cruiser
+                        state.name = Some("Cruiser".to_string());
+
+                        // command: scale 5
+                        state.model_scale = 5.0;
+
+                        // command: vehicle yes
+                        state.is_vehicle = true;
+
+                        // command: angularmomentum 0 0 0
+                        state.angular_momentum = DVec3::ZERO;
+
+                        // command: collider handcrafted
+                        state.collider_is_one_mesh_of_scene = true;
+
+                        // command: thrust 16 16 8 100000 3
+                        state.thrust_forward = 16.0;
+                        state.thrust_back = 16.0;
+                        state.thrust_sideways = 8.0;
+                        state.reaction_wheels = 100000.0;
+                        state.warmup_seconds = 3.0;
+
+                        // command: engine ion
+                        state.engine_type = actor::EngineType::Ion;
+
+                        // command: camdistance 50
+                        state.camdistance = 50.0;
+
+                        // command: density 500
+                        state.density = 500.0;
+
+                        // command: pointofinterest yes
+                        state.is_point_of_interest = true;
+                        ew_spawn.send(SpawnEvent(state));
+                    }
+                    _ => {}
+                }
+            }
+        }
+    }
+}
+
+fn spawn_entities(
+    mut er_spawn: EventReader<SpawnActorEvent>,
     mut commands: Commands,
     asset_server: Res<AssetServer>,
     mut meshes: ResMut<Assets<Mesh>>,
@@ -667,7 +778,7 @@ fn spawn_entities(
         };
         let state = &state_wrapper.0;
         let mut rotation = state.rotation;
-        if state.class == DefClass::Actor {
+
         // Preprocessing
         let mut absolute_pos = if let Some(id) = &state.relative_to {
             match id2pos.0.get(&id.to_string()) {
@@ -695,9 +806,8 @@ fn spawn_entities(
                     }
                 };
                 let orbital_period = nature::simple_orbital_period(mass, r);
-                    phase_radians += if let Ok(epoch) =
-                        SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
-                    {
+                phase_radians +=
+                    if let Ok(epoch) = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH) {
                         let now = epoch.as_secs_f64() + 614533234154.0; // random
                         PI * 2.0 * (now % orbital_period) / orbital_period
                     } else {
@@ -984,8 +1094,8 @@ fn spawn_entities(
         }
 
         if state.has_ring {
-                let ring_radius = state.model_scale
-                    * (nature::JUPITER_RING_RADIUS / nature::JUPITER_RADIUS) as f32;
+            let ring_radius =
+                state.model_scale * (nature::JUPITER_RING_RADIUS / nature::JUPITER_RADIUS) as f32;
             commands.spawn((
                 world::DespawnOnPlayerDeath,
                 MaterialMeshBundle {
@@ -1006,7 +1116,6 @@ fn spawn_entities(
         }
     }
 }
-}
 
 pub fn hide_colliders(
     mut q_mesh: Query<(&mut Visibility, &Name), (Added<Visibility>, With<Handle<Mesh>>)>,

src/data/defs.txt

@@ -268,18 +268,8 @@ actor 0 59305 0 suitv2
     health 0.3
     rotationy 135
 
-actor 10 -30 20 cruiser
-    name "Cruiser"
+scene 10 -30 20 test
     relativeto player
-    scale 5
-    vehicle yes
-    collider handcrafted
-    thrust 16 16 8 100000 3
-    engine ion
-    camdistance 50
-    density 500
-    angularmomentum 0.1 0.1 0.3
-    pointofinterest yes
 
 actor -55e3 44e3 0 suitv2
     template person