Rework world crate

Cargo.lock

@@ -579,7 +579,6 @@ version = "0.0.0"
 dependencies = [
  "anyhow",
  "cgmath",
- "galactica-behavior",
  "galactica-constants",
  "galactica-content",
  "galactica-gameobject",
@@ -590,15 +589,6 @@ dependencies = [
  "winit",
 ]
 
-[[package]]
-name = "galactica-behavior"
-version = "0.0.0"
-dependencies = [
- "cgmath",
- "galactica-content",
- "galactica-world",
-]
-
 [[package]]
 name = "galactica-constants"
 version = "0.0.0"
@@ -647,6 +637,7 @@ dependencies = [
  "cgmath",
  "galactica-constants",
  "galactica-content",
+ "galactica-gameobject",
  "galactica-packer",
  "galactica-world",
  "image",

Cargo.toml

@@ -46,7 +46,6 @@ galactica-constants = { path = "crates/constants" }
 galactica-content = { path = "crates/content" }
 galactica-render = { path = "crates/render" }
 galactica-world = { path = "crates/world" }
-galactica-behavior = { path = "crates/behavior" }
 galactica-gameobject = { path = "crates/gameobject" }
 galactica-packer = { path = "crates/packer" }
 galactica = { path = "crates/galactica" }

crates/behavior/Cargo.toml

@@ -1,22 +0,0 @@
-[package]
-name = "galactica-behavior"
-description = "AI behaviors for Galactica"
-categories = { workspace = true }
-keywords = { workspace = true }
-version = { workspace = true }
-rust-version = { workspace = true }
-authors = { workspace = true }
-edition = { workspace = true }
-homepage = { workspace = true }
-repository = { workspace = true }
-license = { workspace = true }
-documentation = { workspace = true }
-readme = { workspace = true }
-
-[lints]
-workspace = true
-
-[dependencies]
-galactica-content = { workspace = true }
-galactica-world = { workspace = true }
-cgmath = { workspace = true }

crates/behavior/src/behavior/dummy.rs

@@ -1,23 +0,0 @@
-use crate::ShipBehavior;
-use galactica_content as content;
-use galactica_world::{ShipPhysicsHandle, World};
-
-/// Dummy ship behavior.
-/// Does nothing.
-pub struct Dummy {
-	_handle: ShipPhysicsHandle,
-}
-
-impl Dummy {
-	/// Create a new ship controller
-	pub fn new(handle: ShipPhysicsHandle) -> Self {
-		Self { _handle: handle }
-	}
-}
-
-impl ShipBehavior for Dummy {
-	fn update_controls(&mut self, _physics: &mut World, _content: &content::Content) {}
-	fn get_handle(&self) -> ShipPhysicsHandle {
-		return self._handle;
-	}
-}

crates/behavior/src/behavior/mod.rs

@@ -1,9 +0,0 @@
-//! Various implementations of [`crate::ShipBehavior`]
-
-mod dummy;
-mod player;
-mod point;
-
-pub use dummy::Dummy;
-pub use player::Player;
-pub use point::Point;

crates/behavior/src/behavior/player.rs

@@ -1,48 +0,0 @@
-use crate::ShipBehavior;
-use galactica_content as content;
-use galactica_world::{ShipPhysicsHandle, World};
-
-/// Player ship behavior.
-/// Controls a ship using controller input
-pub struct Player {
-	handle: ShipPhysicsHandle,
-
-	/// Turn left
-	pub key_left: bool,
-
-	/// Turn right
-	pub key_right: bool,
-
-	/// Fire guns
-	pub key_guns: bool,
-
-	/// Foward thrust
-	pub key_thrust: bool,
-}
-
-impl Player {
-	/// Make a new ship controller
-	pub fn new(handle: ShipPhysicsHandle) -> Self {
-		Self {
-			handle,
-			key_left: false,
-			key_right: false,
-			key_guns: false,
-			key_thrust: false,
-		}
-	}
-}
-
-impl ShipBehavior for Player {
-	fn update_controls(&mut self, physics: &mut World, _content: &content::Content) {
-		let s = physics.get_ship_mut(&self.handle).unwrap();
-		s.controls.left = self.key_left;
-		s.controls.right = self.key_right;
-		s.controls.guns = self.key_guns;
-		s.controls.thrust = self.key_thrust;
-	}
-
-	fn get_handle(&self) -> ShipPhysicsHandle {
-		return self.handle;
-	}
-}

crates/behavior/src/lib.rs

@@ -1,21 +0,0 @@
-#![warn(missing_docs)]
-
-//! Computer-controlled ship behaviors
-
-pub mod behavior;
-
-use galactica_content as content;
-use galactica_world::{ShipPhysicsHandle, World};
-
-/// Main behavior trait. Any struct that implements this
-/// may be used to control a ship.
-pub trait ShipBehavior
-where
-	Self: Send,
-{
-	/// Update a ship's controls based on world state
-	fn update_controls(&mut self, physics: &mut World, content: &content::Content);
-
-	/// Get the ship this behavior is attached to
-	fn get_handle(&self) -> ShipPhysicsHandle;
-}

crates/content/src/lib.rs

@@ -272,6 +272,11 @@ impl Content {
 
 // Access methods
 impl Content {
+	/// Iterate over all valid system handles
+	pub fn iter_systems(&self) -> impl Iterator<Item = SystemHandle> {
+		(0..self.systems.len()).map(|x| SystemHandle { index: x })
+	}
+
 	/// Get the handle for the starfield sprite
 	pub fn get_starfield_handle(&self) -> SpriteHandle {
 		match self.starfield_handle {

crates/galactica/Cargo.toml

@@ -25,7 +25,6 @@ galactica-content = { workspace = true }
 galactica-render = { workspace = true }
 galactica-constants = { workspace = true }
 galactica-world = { workspace = true }
-galactica-behavior = { workspace = true }
 galactica-gameobject = { workspace = true }
 
 winit = { workspace = true }

crates/galactica/src/game.rs

@@ -1,23 +1,23 @@
-use cgmath::Point2;
-use content::Ship;
-use object::{ship::ShipPersonality, GameData};
+use object::{
+	ship::{OutfitSet, ShipPersonality},
+	GameData, GameShipHandle,
+};
 use std::time::Instant;
 use winit::event::{ElementState, MouseButton, MouseScrollDelta, TouchPhase, VirtualKeyCode};
 
 use crate::camera::Camera;
 use crate::inputstatus::InputStatus;
 
-use galactica_behavior::{behavior, ShipBehavior};
 use galactica_constants;
 use galactica_content as content;
 use galactica_gameobject as object;
 use galactica_render::RenderState;
-use galactica_world::{util, ParticleBuilder, ShipPhysicsHandle, World};
+use galactica_world::{objects::ShipControls, ParticleBuilder, StepResources, World};
 
 pub struct Game {
 	input: InputStatus,
 	last_update: Instant,
-	player: ShipPhysicsHandle,
+	player: GameShipHandle,
 	paused: bool,
 	time_scale: f32,
 	start_instant: Instant,
@@ -25,9 +25,6 @@ pub struct Game {
 
 	// TODO: include system in world
 	//system: object::System,
-	shipbehaviors: Vec<Box<dyn ShipBehavior>>,
-	playerbehavior: behavior::Player,
-
 	gamedata: GameData,
 
 	content: content::Content,
@@ -37,28 +34,28 @@ pub struct Game {
 
 impl Game {
 	pub fn new(ct: content::Content) -> Self {
-		let mut physics = World::new();
-		let mut gamedata = GameData::new();
+		let mut gamedata = GameData::new(&ct);
 
 		let ss = ct.get_ship(content::ShipHandle { index: 0 });
 
-		let mut o1 = object::OutfitSet::new(ss);
-		o1.add(&ct, content::OutfitHandle { index: 0 });
-		o1.add(&ct, content::OutfitHandle { index: 1 });
-		o1.add_gun(&ct, content::GunHandle { index: 0 });
-		o1.add_gun(&ct, content::GunHandle { index: 0 });
-		o1.add_gun(&ct, content::GunHandle { index: 0 });
+		let mut o1 = OutfitSet::new(ss.space, &[]);
+		o1.add(&ct.get_outfit(content::OutfitHandle { index: 0 }));
+		o1.add(&ct.get_outfit(content::OutfitHandle { index: 1 }));
+		//o1.add_gun(&ct, content::GunHandle { index: 0 });
+		//o1.add_gun(&ct, content::GunHandle { index: 0 });
+		//o1.add_gun(&ct, content::GunHandle { index: 0 });
 
-		let mut o1 = object::OutfitSet::new(ss);
-		o1.add(&ct, content::OutfitHandle { index: 0 });
-		o1.add_gun(&ct, content::GunHandle { index: 0 });
+		let mut o1 = OutfitSet::new(ss.space, &[]);
+		o1.add(&ct.get_outfit(content::OutfitHandle { index: 0 }));
+		//o1.add_gun(&ct, content::GunHandle { index: 0 });
 
-		gamedata.create_ship(
+		let player = gamedata.create_ship(
 			&ct,
 			content::ShipHandle { index: 0 },
 			content::FactionHandle { index: 0 },
 			ShipPersonality::Player,
-			o1,
+			o1.clone(),
+			&content::SystemHandle { index: 0 },
 		);
 
 		gamedata.create_ship(
@@ -66,7 +63,8 @@ impl Game {
 			content::ShipHandle { index: 0 },
 			content::FactionHandle { index: 1 },
 			ShipPersonality::Dummy,
-			object::OutfitSet::new(ss),
+			OutfitSet::new(ss.space, &[]),
+			&content::SystemHandle { index: 0 },
 		);
 
 		gamedata.create_ship(
@@ -75,16 +73,15 @@ impl Game {
 			content::FactionHandle { index: 1 },
 			ShipPersonality::Point,
 			o1,
+			&content::SystemHandle { index: 0 },
 		);
 
-		//let mut shipbehaviors: Vec<Box<dyn ShipBehavior>> = Vec::new();
-		//shipbehaviors.push(Box::new(behavior::Dummy::new(h2)));
-		//shipbehaviors.push(Box::new(behavior::Point::new(h3)));
+		let physics = World::new(&ct, &gamedata, content::SystemHandle { index: 0 });
 
 		Game {
 			last_update: Instant::now(),
 			input: InputStatus::new(),
-			player: h1,
+			player,
 			start_instant: Instant::now(),
 
 			camera: Camera {
@@ -96,10 +93,8 @@ impl Game {
 			paused: false,
 			time_scale: 1.0,
 			world: physics,
-			shipbehaviors,
 			gamedata,
 			content: ct,
-			playerbehavior: behavior::Player::new(h1),
 			new_particles: Vec::new(),
 		}
 	}
@@ -132,39 +127,27 @@ impl Game {
 	pub fn update(&mut self) {
 		let t: f32 = self.last_update.elapsed().as_secs_f32() * self.time_scale;
 
-		self.playerbehavior.key_guns = self.input.key_guns;
-		self.playerbehavior.key_thrust = self.input.key_thrust;
-		self.playerbehavior.key_right = self.input.key_right;
-		self.playerbehavior.key_left = self.input.key_left;
-		self.playerbehavior
-			.update_controls(&mut self.world, &self.content);
-
-		self.shipbehaviors.retain_mut(|b| {
-			// Remove shipbehaviors of destroyed ships
-			if self.world.get_ship_mut(&b.get_handle()).is_none() {
-				false
-			} else {
-				b.update_controls(&mut self.world, &self.content);
-				true
-			}
+		let world_output = self.world.step(StepResources {
+			player: self.player,
+			player_controls: ShipControls {
+				left: self.input.key_left,
+				right: self.input.key_right,
+				thrust: self.input.key_thrust,
+				guns: self.input.key_guns,
+			},
+			ct: &self.content,
+			dt: &mut self.gamedata,
+			particles: &mut self.new_particles,
+			t,
 		});
 
-		self.world.step(t, &self.content, &mut self.new_particles);
-
 		if self.input.v_scroll != 0.0 {
 			self.camera.zoom = (self.camera.zoom + self.input.v_scroll)
 				.clamp(galactica_constants::ZOOM_MIN, galactica_constants::ZOOM_MAX);
 			self.input.v_scroll = 0.0;
 		}
 
-		let r = self
-			.world
-			.get_ship_mut(&self.player)
-			.unwrap()
-			.physics_handle;
-		let r = self.world.get_rigid_body(r.0).unwrap(); // TODO: r.0 shouldn't be public
-		let ship_pos = util::rigidbody_position(r);
-		self.camera.pos = ship_pos;
+		self.camera.pos = world_output.player_position;
 		self.last_update = Instant::now();
 	}
 
@@ -176,7 +159,8 @@ impl Game {
 			content: &self.content,
 			world: &self.world,
 			particles: &mut self.new_particles,
-			player: &self.player,
+			player_data: self.player,
+			data: &self.gamedata,
 		}
 	}
 }

crates/gameobject/src/gamedata.rs

@@ -5,21 +5,33 @@ use crate::{
 	ship::Ship,
 	ship::{OutfitSet, ShipPersonality},
 };
-use content::ShipHandle;
 use galactica_content as content;
 
 /// Keeps track of all objects in the galaxy.
 /// This struct does NO physics, it keeps track of data exclusively.
+#[derive(Debug)]
 pub struct GameData {
-	// Universal counter.
-	// Used to create unique handles for game objects.
+	/// Universal counter.
+	/// Used to create unique handles for game objects.
 	index: u64,
+
+	/// All ships in the galaxy
 	ships: HashMap<GameShipHandle, Ship>,
+
+	/// Ships indexed by the system they're in.
+	/// A ship must always be in exactly one system.
+	system_ship_table: HashMap<content::SystemHandle, Vec<GameShipHandle>>,
+
+	/// Systems indexed by which ships they contain.
+	/// A ship must always be in exactly one system.
+	ship_system_table: HashMap<GameShipHandle, content::SystemHandle>,
 }
 
 impl GameData {
-	pub fn new() -> Self {
+	pub fn new(ct: &content::Content) -> Self {
 		Self {
+			system_ship_table: ct.iter_systems().map(|s| (s, Vec::new())).collect(),
+			ship_system_table: HashMap::new(),
 			index: 0,
 			ships: HashMap::new(),
 		}
@@ -29,19 +41,40 @@ impl GameData {
 	pub fn create_ship(
 		&mut self,
 		ct: &content::Content,
-		ship: ShipHandle,
+		ship: content::ShipHandle,
 		faction: content::FactionHandle,
 		personality: ShipPersonality,
 		outfits: OutfitSet,
+		system: &content::SystemHandle,
 	) -> GameShipHandle {
-		let handle = GameShipHandle { index: self.index };
+		let handle = GameShipHandle {
+			index: self.index,
+			content: ship,
+		};
 		self.index += 1;
-		self.ships
-			.insert(handle, Ship::new(ct, ship, faction, personality, outfits));
+
+		self.ships.insert(
+			handle,
+			Ship::new(ct, handle, ship, faction, personality, outfits),
+		);
+		self.system_ship_table.get_mut(system).unwrap().push(handle);
+		self.ship_system_table.insert(handle, *system);
+
 		return handle;
 	}
+}
 
+// Public getters
+impl GameData {
 	pub fn get_ship(&self, handle: GameShipHandle) -> Option<&Ship> {
 		self.ships.get(&handle)
 	}
+
+	pub fn get_ship_mut(&mut self, handle: GameShipHandle) -> Option<&mut Ship> {
+		self.ships.get_mut(&handle)
+	}
+
+	pub fn iter_ships(&self) -> impl Iterator<Item = &Ship> {
+		self.ships.values()
+	}
 }

crates/gameobject/src/handles.rs

@@ -1,5 +1,33 @@
+use std::hash::Hash;
+
+use galactica_content::ShipHandle;
+
 /// A lightweight representation of a ship in the galaxy
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy)]
 pub struct GameShipHandle {
+	/// This ship's unique index
 	pub(crate) index: u64,
+
+	/// This ship's content handle
+	/// (technically redundant, but this greatly simplifies code)
+	pub(crate) content: ShipHandle,
+}
+
+impl GameShipHandle {
+	pub fn content_handle(&self) -> ShipHandle {
+		self.content
+	}
+}
+
+impl Hash for GameShipHandle {
+	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+		self.index.hash(state)
+	}
+}
+
+impl Eq for GameShipHandle {}
+impl PartialEq for GameShipHandle {
+	fn eq(&self, other: &Self) -> bool {
+		self.index.eq(&other.index)
+	}
 }

crates/gameobject/src/projectile.rs

@@ -1,20 +0,0 @@
-use galactica_content as content;
-
-// TODO: remove. projectiles only exist in physics
-
-#[derive(Debug)]
-pub struct Projectile {
-	pub content: content::Projectile,
-	pub lifetime: f32,
-	pub faction: content::FactionHandle,
-}
-
-impl Projectile {
-	pub fn tick(&mut self, t: f32) {
-		self.lifetime -= t;
-	}
-
-	pub fn is_expired(&self) -> bool {
-		return self.lifetime < 0.0;
-	}
-}

crates/gameobject/src/ship/outfitset.rs

@@ -29,7 +29,7 @@ pub enum OutfitRemoveResult {
 }
 
 /// A simple data class, used to keep track of delayed shield generators
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub(crate) struct ShieldGenerator {
 	pub outfit: OutfitHandle,
 	pub delay: f32,
@@ -37,7 +37,7 @@ pub(crate) struct ShieldGenerator {
 }
 
 /// This struct keeps track of a ship's outfit loadout.
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct OutfitSet {
 	/// What outfits does this statsum contain?
 	outfits: HashMap<OutfitHandle, u32>,

crates/gameobject/src/ship/ship.rs

@@ -1,11 +1,14 @@
 use std::time::Instant;
 
+use crate::GameShipHandle;
+
 use super::{OutfitSet, ShipPersonality};
 use galactica_content as content;
 
 #[derive(Debug)]
 pub struct Ship {
 	// Metadata values
+	handle: GameShipHandle,
 	ct_handle: content::ShipHandle,
 	faction: content::FactionHandle,
 	outfits: OutfitSet,
@@ -25,6 +28,7 @@ pub struct Ship {
 impl Ship {
 	pub(crate) fn new(
 		ct: &content::Content,
+		handle: GameShipHandle,
 		ct_handle: content::ShipHandle,
 		faction: content::FactionHandle,
 		personality: ShipPersonality,
@@ -33,6 +37,7 @@ impl Ship {
 		let s = ct.get_ship(ct_handle);
 		let shields = outfits.get_shield_strength();
 		Ship {
+			handle,
 			ct_handle,
 			faction,
 			outfits,
@@ -84,10 +89,20 @@ impl Ship {
 
 // Misc getters, so internal state is untouchable
 impl Ship {
+	/// Get a handle to this ship game object
+	pub fn get_handle(&self) -> GameShipHandle {
+		self.handle
+	}
+
+	/// Get a handle to this ship's content
+	pub fn get_content(&self) -> content::ShipHandle {
+		self.ct_handle
+	}
+
 	/// Get this ship's current hull.
 	/// Use content handle to get maximum hull
 	pub fn get_hull(&self) -> f32 {
-		return self.hull;
+		self.hull
 	}
 
 	/// Get this ship's current shields.

crates/render/Cargo.toml

@@ -21,6 +21,7 @@ galactica-content = { workspace = true }
 galactica-constants = { workspace = true }
 galactica-packer = { workspace = true }
 galactica-world = { workspace = true }
+galactica-gameobject = { workspace = true }
 
 anyhow = { workspace = true }
 cgmath = { workspace = true }

crates/render/src/gpustate/hud.rs

@@ -22,7 +22,12 @@ impl GPUState {
 		//let system_object_scale = 1.0 / 600.0;
 		let ship_scale = 1.0 / 10.0;
 
-		let (_, player_body) = state.world.get_ship_body(*state.player).unwrap();
+		let player_world_object = state.world.get_ship(state.player_data).unwrap();
+		let player_body = state
+			.world
+			.get_rigid_body(player_world_object.rigid_body)
+			.unwrap();
+
 		let player_position = util::rigidbody_position(player_body);
 		//let planet_sprite = state.content.get_sprite_handle("ui::planetblip");
 		let ship_sprite = state.content.get_sprite_handle("ui::shipblip");
@@ -88,7 +93,8 @@ impl GPUState {
 
 		// Draw ships
 		for (s, r) in state.world.iter_ship_body() {
-			let ship = state.content.get_ship(s.ship.handle);
+			let data = state.data.get_ship(s.data_handle).unwrap();
+			let ship = state.content.get_ship(s.data_handle.content_handle());
 			let size = (ship.size * ship.sprite.aspect) * ship_scale;
 			let p = util::rigidbody_position(r);
 			let d = (p - player_position) / radar_range;
@@ -99,7 +105,7 @@ impl GPUState {
 					continue;
 				}
 				let angle = util::rigidbody_rotation(r).angle(Vector2 { x: 0.0, y: 1.0 });
-				let f = state.content.get_faction(s.ship.faction).color;
+				let f = state.content.get_faction(data.get_faction()).color;
 				let f = [f[0], f[1], f[2], 1.0];
 
 				let position = Point2 {
@@ -264,11 +270,16 @@ impl GPUState {
 			panic!("UI limit exceeded!")
 		}
 
-		let (s, _) = state.world.get_ship_body(*state.player).unwrap();
-		let max_shields = s.ship.outfits.stat_sum().shield_strength;
-		let current_shields = s.ship.shields;
-		let current_hull = s.ship.hull;
-		let max_hull = state.content.get_ship(s.ship.handle).hull;
+		let player_world_object = state.world.get_ship(state.player_data).unwrap();
+
+		let data = state
+			.data
+			.get_ship(player_world_object.data_handle)
+			.unwrap();
+		let max_shields = data.get_outfits().get_shield_strength();
+		let current_shields = data.get_shields();
+		let current_hull = data.get_hull();
+		let max_hull = state.content.get_ship(data.get_content()).hull;
 
 		self.queue.write_buffer(
 			&self.vertex_buffers.ui.instances,

crates/render/src/gpustate/world.rs

@@ -21,11 +21,12 @@ impl GPUState {
 		screen_clip: (Point2<f32>, Point2<f32>),
 		s: &ShipWorldObject,
 	) {
-		let (_, r) = state.world.get_ship_body(s.physics_handle).unwrap();
+		let r = state.world.get_rigid_body(s.rigid_body).unwrap();
+		let ship = state.data.get_ship(s.data_handle);
 		let ship_pos = util::rigidbody_position(&r);
 		let ship_rot = util::rigidbody_rotation(r);
 		let ship_ang = -ship_rot.angle(Vector2 { x: 0.0, y: 1.0 }); // TODO: inconsistent angles. Fix!
-		let ship_cnt = state.content.get_ship(s.ship.handle);
+		let ship_cnt = state.content.get_ship(s.data_handle.content_handle());
 
 		// Position adjusted for parallax
 		// TODO: adjust parallax for zoom?
@@ -84,8 +85,10 @@ impl GPUState {
 		);
 		self.vertex_buffers.object_counter += 1;
 
+		/*
 		// Draw engine flares if necessary
-		if s.controls.thrust && !s.ship.is_dead() {
+		//if s.controls.thrust && !s.ship.is_dead() {
+		if s.controls.thrust {
 			for f in s.ship.outfits.iter_enginepoints() {
 				let flare = match s.ship.outfits.get_flare_sprite() {
 					None => continue,
@@ -126,6 +129,7 @@ impl GPUState {
 				self.vertex_buffers.object_counter += 1;
 			}
 		}
+		*/
 	}
 
 	pub(super) fn world_push_projectile(
@@ -139,7 +143,7 @@ impl GPUState {
 		let proj_pos = util::rigidbody_position(&r);
 		let proj_rot = util::rigidbody_rotation(r);
 		let proj_ang = -proj_rot.angle(Vector2 { x: 1.0, y: 0.0 });
-		let proj_cnt = &p.projectile.content; // TODO: don't clone this?
+		let proj_cnt = &p.content; // TODO: don't clone this?
 
 		// Position adjusted for parallax
 		// TODO: adjust parallax for zoom?

crates/render/src/renderstate.rs

@@ -1,14 +1,15 @@
 use cgmath::Point2;
 use galactica_content::Content;
-use galactica_world::{ParticleBuilder, ShipPhysicsHandle, World};
+use galactica_gameobject::{GameData, GameShipHandle};
+use galactica_world::{ParticleBuilder, World};
 
 /// Bundles parameters passed to a single call to GPUState::render
 pub struct RenderState<'a> {
 	/// Camera position, in world units
 	pub camera_pos: Point2<f32>,
 
-	/// Player ship
-	pub player: &'a ShipPhysicsHandle,
+	/// Player ship data
+	pub player_data: GameShipHandle,
 
 	/// Height of screen, in world units
 	pub camera_zoom: f32,
@@ -23,6 +24,9 @@ pub struct RenderState<'a> {
 	/// Game content
 	pub content: &'a Content,
 
+	/// Game data
+	pub data: &'a GameData,
+
 	/// Particles to spawn during this frame
 	pub particles: &'a mut Vec<ParticleBuilder>,
 }

crates/world/src/behavior/mod.rs

@@ -0,0 +1,18 @@
+//! Various implementations of [`crate::ShipBehavior`]
+
+mod null;
+//mod point;
+
+pub use null::*;
+//pub use point::Point;
+
+use crate::{objects::ShipControls, StepResources};
+
+/// Main behavior trait. Any struct that implements this
+/// may be used to control a ship.
+pub trait ShipBehavior {
+	/// Update a ship's controls based on world state.
+	/// This method does not return anything, it modifies
+	/// the ship's controls in-place.
+	fn update_controls(&mut self, res: &StepResources) -> ShipControls;
+}

crates/world/src/behavior/null.rs

@@ -0,0 +1,19 @@
+use super::ShipBehavior;
+use crate::{objects::ShipControls, StepResources};
+
+/// The Null behaviors is assigned to objects that are not controlled by the computer.
+/// Most notably, the player's ship has a Null behavior.
+pub struct Null {}
+
+impl Null {
+	/// Create a new ship controller
+	pub fn new() -> Self {
+		Self {}
+	}
+}
+
+impl ShipBehavior for Null {
+	fn update_controls(&mut self, _res: &StepResources) -> ShipControls {
+		ShipControls::new()
+	}
+}

crates/world/src/behavior/point.rs

@@ -1,24 +1,30 @@
 use cgmath::{Deg, InnerSpace};
+use galactica_gameobject::GameData;
 
-use crate::ShipBehavior;
 use galactica_content as content;
-use galactica_world::{util, ShipPhysicsHandle, World};
+
+use crate::World;
+
+use super::ShipBehavior;
 
 /// "Point" ship behavior.
 /// Point and shoot towards the nearest enemy.
-pub struct Point {
-	handle: ShipPhysicsHandle,
-}
+pub struct Point {}
 
 impl Point {
 	/// Create a new ship controller
-	pub fn new(handle: ShipPhysicsHandle) -> Self {
-		Self { handle }
+	pub fn new() -> Self {
+		Self {}
 	}
 }
 
 impl ShipBehavior for Point {
-	fn update_controls(&mut self, physics: &mut World, content: &content::Content) {
+	fn update_controls(
+		&mut self,
+		physics: &mut World,
+		content: &content::Content,
+		data: &GameData,
+	) {
 		// Turn off all controls
 		let s = physics.get_ship_mut(&self.handle).unwrap();
 		s.controls.left = false;
@@ -27,20 +33,22 @@ impl ShipBehavior for Point {
 		s.controls.thrust = false;
 
 		let (my_s, my_r) = physics.get_ship_body(self.handle).unwrap();
+		let my_data = data.get_ship(my_s.data_handle).unwrap();
 		let my_position = util::rigidbody_position(my_r);
 		let my_rotation = util::rigidbody_rotation(my_r);
 		let my_angvel = my_r.angvel();
-		let my_faction = content.get_faction(my_s.ship.faction);
+		let my_faction = content.get_faction(my_data.get_faction());
 
 		// Iterate all possible targets
 		let mut it = physics
 			.iter_ship_body()
-			.filter(
-				|(s, _)| match my_faction.relationships.get(&s.ship.faction).unwrap() {
+			.filter(|(s, _)| {
+				let data = data.get_ship(s.data_handle).unwrap();
+				match my_faction.relationships.get(&data.get_faction()).unwrap() {
 					content::Relationship::Hostile => true,
 					_ => false,
-				},
-			)
+				}
+			})
 			.map(|(_, r)| r);
 
 		// Find the closest target
@@ -75,8 +83,4 @@ impl ShipBehavior for Point {
 		s.controls.guns = true;
 		s.controls.thrust = false;
 	}
-
-	fn get_handle(&self) -> ShipPhysicsHandle {
-		return self.handle;
-	}
 }

crates/world/src/lib.rs

@@ -3,102 +3,14 @@
 //! This module keeps track of the visible world.
 //! Ships, projectiles, collisions, etc.
 
+pub mod behavior;
 pub mod objects;
+mod particlebuilder;
+mod stepresources;
 pub mod util;
 mod world;
 mod wrapper;
 
-use cgmath::{Matrix2, Point2, Rad, Vector2};
-use galactica_content as content;
-use rand::Rng;
+pub use particlebuilder::*;
+pub use stepresources::*;
 pub use world::World;
-
-use rapier2d::{dynamics::RigidBodyHandle, geometry::ColliderHandle};
-
-/// A lightweight handle for a specific ship in our physics system
-#[derive(Debug, Copy, Clone, PartialEq, Eq)]
-pub struct ShipPhysicsHandle(pub RigidBodyHandle, ColliderHandle);
-
-/// Instructions to create a new particle
-pub struct ParticleBuilder {
-	/// The sprite to use for this particle
-	pub sprite: content::SpriteHandle,
-
-	/// This object's center, in world coordinates.
-	pub pos: Point2<f32>,
-
-	/// This particle's velocity, in world coordinates
-	pub velocity: Vector2<f32>,
-
-	/// This particle's angle
-	pub angle: Rad<f32>,
-
-	/// This particle's angular velocity (rad/sec)
-	pub angvel: Rad<f32>,
-
-	/// This particle's lifetime, in seconds
-	pub lifetime: f32,
-
-	/// The size of this particle,
-	/// given as height in world units.
-	pub size: f32,
-
-	/// Fade this particle out over this many seconds as it expires
-	pub fade: f32,
-}
-
-impl ParticleBuilder {
-	/// Create a ParticleBuilder from an Effect
-	pub fn from_content(
-		effect: &content::Effect,
-		pos: Point2<f32>,
-		parent_angle: Rad<f32>,
-		parent_velocity: Vector2<f32>,
-		target_velocity: Vector2<f32>,
-	) -> Self {
-		let mut rng = rand::thread_rng();
-
-		let velocity = {
-			let a =
-				rng.gen_range(-effect.velocity_scale_parent_rng..=effect.velocity_scale_parent_rng);
-			let b =
-				rng.gen_range(-effect.velocity_scale_target_rng..=effect.velocity_scale_target_rng);
-
-			let velocity = ((effect.velocity_scale_parent + a) * parent_velocity)
-				+ ((effect.velocity_scale_target + b) * target_velocity);
-
-			Matrix2::from_angle(Rad(
-				rng.gen_range(-effect.direction_rng..=effect.direction_rng)
-			)) * velocity
-		};
-
-		// Rad has odd behavior when its angle is zero, so we need extra checks here
-		let angvel = if effect.angvel_rng == 0.0 {
-			effect.angvel
-		} else {
-			Rad(effect.angvel.0 + rng.gen_range(-effect.angvel_rng..=effect.angvel_rng))
-		};
-		let angle = if effect.angle_rng == 0.0 {
-			parent_angle + effect.angle
-		} else {
-			parent_angle + effect.angle + Rad(rng.gen_range(-effect.angle_rng..=effect.angle_rng))
-		};
-
-		ParticleBuilder {
-			sprite: effect.sprite,
-			pos,
-			velocity,
-
-			angle,
-			angvel,
-
-			lifetime: 0f32
-				.max(effect.lifetime + rng.gen_range(-effect.lifetime_rng..=effect.lifetime_rng)),
-
-			// Make sure size isn't negative. This check should be on EVERY rng!
-			size: 0f32.max(effect.size + rng.gen_range(-effect.size_rng..=effect.size_rng)),
-
-			fade: 0f32.max(effect.fade + rng.gen_range(-effect.fade_rng..=effect.fade_rng)),
-		}
-	}
-}

crates/world/src/objects/mod.rs

@@ -3,4 +3,4 @@ mod projectile;
 mod ship;
 
 pub use projectile::ProjectileWorldObject;
-pub use ship::ShipWorldObject;
+pub use ship::{ShipControls, ShipWorldObject};

crates/world/src/objects/projectile.rs

@@ -1,13 +1,19 @@
 use rand::Rng;
 use rapier2d::{dynamics::RigidBodyHandle, geometry::ColliderHandle};
 
-use galactica_gameobject as object;
+use galactica_content as content;
 
 /// A single projectile in the world
 #[derive(Debug)]
 pub struct ProjectileWorldObject {
 	/// This projectile's game data
-	pub projectile: object::Projectile,
+	pub content: content::Projectile,
+
+	/// The remaining lifetime of this projectile, in seconds
+	pub lifetime: f32,
+
+	/// The faction this projectile belongs to
+	pub faction: content::FactionHandle,
 
 	/// This projectile's rigidbody
 	pub rigid_body: RigidBodyHandle,
@@ -20,19 +26,33 @@ pub struct ProjectileWorldObject {
 }
 
 impl ProjectileWorldObject {
-	/// Make a new projectile
+	/// Create a new projectile
 	pub fn new(
-		projectile: object::Projectile,
+		content: content::Projectile, // TODO: use a handle
 		rigid_body: RigidBodyHandle,
+		faction: content::FactionHandle,
 		collider: ColliderHandle,
 	) -> Self {
 		let mut rng = rand::thread_rng();
-		let size_rng = projectile.content.size_rng;
+		let size_rng = content.size_rng;
+		let lifetime = content.lifetime;
 		ProjectileWorldObject {
 			rigid_body,
 			collider,
-			projectile,
+			content,
+			lifetime,
+			faction,
 			size_rng: rng.gen_range(-size_rng..=size_rng),
 		}
 	}
+
+	/// Process this projectile's state after `t` seconds
+	pub fn tick(&mut self, t: f32) {
+		self.lifetime -= t;
+	}
+
+	/// Has this projectile expired?
+	pub fn is_expired(&self) -> bool {
+		return self.lifetime < 0.0;
+	}
 }

crates/world/src/objects/ship.rs

@@ -1,17 +1,30 @@
 use cgmath::{Deg, EuclideanSpace, InnerSpace, Matrix2, Rad, Vector2, Zero};
 use nalgebra::{point, vector};
 
+use object::GameShipHandle;
 use rand::{rngs::ThreadRng, Rng};
-use rapier2d::{dynamics::RigidBody, geometry::Collider};
+use rapier2d::{
+	dynamics::{RigidBody, RigidBodyHandle},
+	geometry::{Collider, ColliderHandle},
+};
 
-use crate::{util, ParticleBuilder, ShipPhysicsHandle};
+use crate::{behavior::ShipBehavior, util, ParticleBuilder, StepResources};
 use galactica_content as content;
 use galactica_gameobject as object;
 
+/// A ship's controls
+#[derive(Debug, Clone)]
 pub struct ShipControls {
+	/// True if turning left
 	pub left: bool,
+
+	/// True if turning right
 	pub right: bool,
+
+	/// True if foward thrust
 	pub thrust: bool,
+
+	/// True if firing guns
 	pub guns: bool,
 }
 
@@ -35,22 +48,23 @@ struct ShipCollapseSequence {
 impl ShipCollapseSequence {
 	fn new(total_length: f32) -> Self {
 		Self {
-			total_length: total_length,
+			total_length,
 			time_elapsed: 0.0,
 			rng: rand::thread_rng(),
 		}
 	}
 
+	/// Has this sequence been fully played out?
 	fn is_done(&self) -> bool {
 		self.time_elapsed >= self.total_length
 	}
 
+	/// Pick a random points inside a ship's collider
 	fn random_in_ship(
 		&mut self,
 		ship_content: &content::Ship,
 		collider: &Collider,
 	) -> Vector2<f32> {
-		// Pick a random point inside this ship's collider
 		let mut y = 0.0;
 		let mut x = 0.0;
 		let mut a = false;
@@ -63,17 +77,16 @@ impl ShipCollapseSequence {
 		Vector2 { x, y }
 	}
 
+	/// Step this sequence `t` seconds
 	fn step(
 		&mut self,
-		ship: &object::Ship,
-		ct: &content::Content,
-		particles: &mut Vec<ParticleBuilder>,
+		res: &mut StepResources,
+		ship: GameShipHandle,
 		rigid_body: &mut RigidBody,
 		collider: &mut Collider,
-		t: f32,
 	) {
-		let h = ship.handle;
-		let ship_content = ct.get_ship(h);
+		let h = ship.content_handle();
+		let ship_content = res.ct.get_ship(h);
 		let ship_pos = util::rigidbody_position(rigid_body);
 		let ship_rot = util::rigidbody_rotation(rigid_body);
 		let ship_ang = ship_rot.angle(Vector2 { x: 1.0, y: 0.0 });
@@ -85,11 +98,11 @@ impl ShipCollapseSequence {
 		for event in &ship_content.collapse.events {
 			match event {
 				content::CollapseEvent::Effect(event) => {
-					if (event.time > self.time_elapsed && event.time <= self.time_elapsed + t)
+					if (event.time > self.time_elapsed && event.time <= self.time_elapsed + res.t)
 						|| (event.time == 0.0 && self.time_elapsed == 0.0)
 					{
 						for spawner in &event.effects {
-							let effect = ct.get_effect(spawner.effect);
+							let effect = res.ct.get_effect(spawner.effect);
 
 							for _ in 0..spawner.count as usize {
 								let pos = if let Some(pos) = spawner.pos {
@@ -102,7 +115,7 @@ impl ShipCollapseSequence {
 
 								let velocity = rigid_body.velocity_at_point(&point![pos.x, pos.y]);
 
-								particles.push(ParticleBuilder::from_content(
+								res.particles.push(ParticleBuilder::from_content(
 									effect,
 									pos,
 									Rad::zero(),
@@ -121,7 +134,7 @@ impl ShipCollapseSequence {
 
 		// Create collapse effects
 		for spawner in &ship_content.collapse.effects {
-			let effect = ct.get_effect(spawner.effect);
+			let effect = res.ct.get_effect(spawner.effect);
 
 			// Probability of adding a particle this frame.
 			// The area of this function over [0, 1] should be 1.
@@ -136,7 +149,7 @@ impl ShipCollapseSequence {
 				return y;
 			};
 
-			let p_add = (t / self.total_length) * pdf(frac_done) * spawner.count;
+			let p_add = (res.t / self.total_length) * pdf(frac_done) * spawner.count;
 
 			if self.rng.gen_range(0.0..=1.0) <= p_add {
 				let pos = if let Some(pos) = spawner.pos {
@@ -149,7 +162,7 @@ impl ShipCollapseSequence {
 				let pos = ship_pos + Matrix2::from_angle(-ship_ang - Rad::from(Deg(90.0))) * pos;
 				let vel = rigid_body.velocity_at_point(&point![pos.x, pos.y]);
 
-				particles.push(ParticleBuilder {
+				res.particles.push(ParticleBuilder {
 					sprite: effect.sprite,
 					pos,
 					velocity: Vector2 { x: vel.x, y: vel.y },
@@ -162,21 +175,28 @@ impl ShipCollapseSequence {
 			}
 		}
 
-		self.time_elapsed += t;
+		self.time_elapsed += res.t;
 	}
 }
 
 /// A ship instance in the physics system
 pub struct ShipWorldObject {
 	/// This ship's physics handle
-	pub physics_handle: ShipPhysicsHandle,
+	pub rigid_body: RigidBodyHandle,
+
+	/// This ship's collider
+	pub collider: ColliderHandle,
 
 	/// This ship's game data
-	pub ship: object::Ship,
+	pub data_handle: GameShipHandle,
 
 	/// This ship's controls
-	pub controls: ShipControls,
+	pub(crate) controls: ShipControls,
 
+	/// This ship's behavior
+	behavior: Box<dyn ShipBehavior>,
+
+	/// This ship's collapse sequence
 	collapse_sequence: ShipCollapseSequence,
 }
 
@@ -184,51 +204,45 @@ impl ShipWorldObject {
 	/// Make a new ship
 	pub fn new(
 		ct: &content::Content,
-		ship: object::Ship,
-		physics_handle: ShipPhysicsHandle,
+		data_handle: GameShipHandle,
+		behavior: Box<dyn ShipBehavior>,
+		rigid_body: RigidBodyHandle,
+		collider: ColliderHandle,
 	) -> Self {
-		let ship_content = ct.get_ship(ship.handle);
+		let ship_content = ct.get_ship(data_handle.content_handle());
 		ShipWorldObject {
-			physics_handle,
-			ship,
+			rigid_body,
+			collider,
+			data_handle,
+			behavior,
 			controls: ShipControls::new(),
 			collapse_sequence: ShipCollapseSequence::new(ship_content.collapse.length),
 		}
 	}
 
-	/// Should this ship should be removed from the world?
-	pub fn remove_from_world(&self) -> bool {
-		return self.ship.is_dead() && self.collapse_sequence.is_done();
+	/// Compute this ship's controls using its behavior
+	pub fn update_controls(&mut self, res: &StepResources) {
+		self.controls = self.behavior.update_controls(res);
 	}
 
 	/// Step this ship's state by t seconds
 	pub fn step(
 		&mut self,
-		ct: &content::Content,
-		particles: &mut Vec<ParticleBuilder>,
+		res: &mut StepResources,
 		rigid_body: &mut RigidBody,
 		collider: &mut Collider,
-		t: f32,
 	) {
-		if self.ship.is_dead() {
-			return self
-				.collapse_sequence
-				.step(&self.ship, ct, particles, rigid_body, collider, t);
-		}
-
-		self.ship.step(t);
-
-		let ship_content = ct.get_ship(self.ship.handle);
+		let ship = res.dt.get_ship(self.data_handle).unwrap();
+		let ship_content = res.ct.get_ship(self.data_handle.content_handle());
 		let ship_pos = util::rigidbody_position(&rigid_body);
 		let ship_rot = util::rigidbody_rotation(rigid_body);
 		let ship_ang = ship_rot.angle(Vector2 { x: 1.0, y: 0.0 });
 		let mut rng = rand::thread_rng();
 
-		if self.ship.hull <= ship_content.damage.hull {
+		if ship.get_hull() <= ship_content.damage.hull {
 			for e in &ship_content.damage.effects {
-				if rng.gen_range(0.0..=1.0) <= t / e.frequency {
-					let effect = ct.get_effect(e.effect);
-					let ship_content = ct.get_ship(self.ship.handle);
+				if rng.gen_range(0.0..=1.0) <= res.t / e.frequency {
+					let effect = res.ct.get_effect(e.effect);
 
 					let pos = if let Some(pos) = e.pos {
 						pos.to_vec()
@@ -252,7 +266,7 @@ impl ShipWorldObject {
 
 					let velocity = rigid_body.velocity_at_point(&point![pos.x, pos.y]);
 
-					particles.push(ParticleBuilder::from_content(
+					res.particles.push(ParticleBuilder::from_content(
 						effect,
 						pos,
 						Rad::zero(),
@@ -266,28 +280,27 @@ impl ShipWorldObject {
 			}
 		}
 
-		let engine_force = ship_rot * t;
+		let engine_force = ship_rot * res.t;
 
 		if self.controls.thrust {
 			rigid_body.apply_impulse(
-				vector![engine_force.x, engine_force.y]
-					* self.ship.outfits.stat_sum().engine_thrust,
+				vector![engine_force.x, engine_force.y] * ship.get_outfits().get_engine_thrust(),
 				true,
 			);
 		}
 
 		if self.controls.right {
 			rigid_body
-				.apply_torque_impulse(self.ship.outfits.stat_sum().steer_power * -100.0 * t, true);
+				.apply_torque_impulse(ship.get_outfits().get_steer_power() * -100.0 * res.t, true);
 		}
 
 		if self.controls.left {
 			rigid_body
-				.apply_torque_impulse(self.ship.outfits.stat_sum().steer_power * 100.0 * t, true);
+				.apply_torque_impulse(ship.get_outfits().get_steer_power() * 100.0 * res.t, true);
 		}
 
-		for i in self.ship.outfits.iter_guns() {
-			i.cooldown -= t;
-		}
+		//for i in self.ship.outfits.iter_guns() {
+		//	i.cooldown -= t;
+		//}
 	}
 }

crates/world/src/particlebuilder.rs

@@ -0,0 +1,88 @@
+use cgmath::{Matrix2, Point2, Rad, Vector2};
+use galactica_content as content;
+use rand::Rng;
+
+/// Instructions to create a new particle
+#[derive(Debug)]
+pub struct ParticleBuilder {
+	/// The sprite to use for this particle
+	pub sprite: content::SpriteHandle,
+
+	/// This object's center, in world coordinates.
+	pub pos: Point2<f32>,
+
+	/// This particle's velocity, in world coordinates
+	pub velocity: Vector2<f32>,
+
+	/// This particle's angle
+	pub angle: Rad<f32>,
+
+	/// This particle's angular velocity (rad/sec)
+	pub angvel: Rad<f32>,
+
+	/// This particle's lifetime, in seconds
+	pub lifetime: f32,
+
+	/// The size of this particle,
+	/// given as height in world units.
+	pub size: f32,
+
+	/// Fade this particle out over this many seconds as it expires
+	pub fade: f32,
+}
+
+impl ParticleBuilder {
+	/// Create a ParticleBuilder from an Effect
+	pub fn from_content(
+		effect: &content::Effect,
+		pos: Point2<f32>,
+		parent_angle: Rad<f32>,
+		parent_velocity: Vector2<f32>,
+		target_velocity: Vector2<f32>,
+	) -> Self {
+		let mut rng = rand::thread_rng();
+
+		let velocity = {
+			let a =
+				rng.gen_range(-effect.velocity_scale_parent_rng..=effect.velocity_scale_parent_rng);
+			let b =
+				rng.gen_range(-effect.velocity_scale_target_rng..=effect.velocity_scale_target_rng);
+
+			let velocity = ((effect.velocity_scale_parent + a) * parent_velocity)
+				+ ((effect.velocity_scale_target + b) * target_velocity);
+
+			Matrix2::from_angle(Rad(
+				rng.gen_range(-effect.direction_rng..=effect.direction_rng)
+			)) * velocity
+		};
+
+		// Rad has odd behavior when its angle is zero, so we need extra checks here
+		let angvel = if effect.angvel_rng == 0.0 {
+			effect.angvel
+		} else {
+			Rad(effect.angvel.0 + rng.gen_range(-effect.angvel_rng..=effect.angvel_rng))
+		};
+		let angle = if effect.angle_rng == 0.0 {
+			parent_angle + effect.angle
+		} else {
+			parent_angle + effect.angle + Rad(rng.gen_range(-effect.angle_rng..=effect.angle_rng))
+		};
+
+		ParticleBuilder {
+			sprite: effect.sprite,
+			pos,
+			velocity,
+
+			angle,
+			angvel,
+
+			lifetime: 0f32
+				.max(effect.lifetime + rng.gen_range(-effect.lifetime_rng..=effect.lifetime_rng)),
+
+			// Make sure size isn't negative. This check should be on EVERY rng!
+			size: 0f32.max(effect.size + rng.gen_range(-effect.size_rng..=effect.size_rng)),
+
+			fade: 0f32.max(effect.fade + rng.gen_range(-effect.fade_rng..=effect.fade_rng)),
+		}
+	}
+}

crates/world/src/stepresources.rs

@@ -0,0 +1,33 @@
+use crate::{objects::ShipControls, ParticleBuilder};
+use cgmath::Point2;
+use galactica_content::Content;
+use galactica_gameobject::{GameData, GameShipHandle};
+
+/// External resources we need to compute time steps
+#[derive(Debug)]
+pub struct StepResources<'a> {
+	/// Game content
+	pub ct: &'a Content,
+
+	/// Game data
+	pub dt: &'a mut GameData,
+
+	/// Length of time step
+	pub t: f32,
+
+	/// Particles to create
+	pub particles: &'a mut Vec<ParticleBuilder>,
+
+	/// Player inputs
+	pub player_controls: ShipControls,
+
+	/// The ship that the player controls
+	pub player: GameShipHandle,
+}
+
+/// Return values after computing time steps
+#[derive(Debug)]
+pub struct StepOutput {
+	/// The player's position in world coordinates
+	pub player_position: Point2<f32>,
+}

crates/world/src/world.rs

@@ -1,6 +1,7 @@
 use cgmath::{Deg, EuclideanSpace, InnerSpace, Matrix2, Point2, Rad, Vector2, Zero};
 use crossbeam::channel::Receiver;
 use nalgebra::{point, vector};
+use object::{ship::Ship, GameData, GameShipHandle};
 use rand::Rng;
 use rapier2d::{
 	dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle},
@@ -10,21 +11,24 @@ use rapier2d::{
 use std::{collections::HashMap, f32::consts::PI};
 
 use crate::{
-	objects,
+	behavior, objects,
 	objects::{ProjectileWorldObject, ShipWorldObject},
 	util,
 	wrapper::Wrapper,
-	ParticleBuilder, ShipPhysicsHandle,
+	ParticleBuilder, StepOutput, StepResources,
 };
 use galactica_content as content;
 use galactica_gameobject as object;
 
-/// Keeps track of all objects in the world that we can interact with.
-/// Also wraps our physics engine
+/// Manages the physics state of one system
 pub struct World {
+	/// The system this world is attached to
+	system: content::SystemHandle,
+
 	wrapper: Wrapper,
 	projectiles: HashMap<ColliderHandle, objects::ProjectileWorldObject>,
-	ships: HashMap<ColliderHandle, objects::ShipWorldObject>,
+	ships: HashMap<GameShipHandle, objects::ShipWorldObject>,
+	collider_ship_table: HashMap<ColliderHandle, GameShipHandle>,
 
 	collision_handler: ChannelEventCollector,
 	collision_queue: Receiver<CollisionEvent>,
@@ -56,23 +60,25 @@ impl<'a> World {
 		return Some((r, p));
 	}
 
-	fn remove_ship(&mut self, h: ShipPhysicsHandle) {
+	fn remove_ship(&mut self, s: &ShipWorldObject) {
 		self.wrapper.rigid_body_set.remove(
-			h.0,
+			s.rigid_body,
 			&mut self.wrapper.im,
 			&mut self.wrapper.collider_set,
 			&mut self.wrapper.ij,
 			&mut self.wrapper.mj,
 			true,
 		);
-		self.ships.remove(&h.1);
+		let h = self.collider_ship_table.remove(&s.collider).unwrap();
+		self.ships.remove(&h);
 	}
 
+	/*
 	/// Add a projectile fired from a ship
 	fn add_projectiles(
 		&mut self,
 		s: ShipPhysicsHandle,
-		p: Vec<(object::Projectile, content::GunPoint)>,
+		p: Vec<(ProjectileWorldObject, content::GunPoint)>,
 	) {
 		let mut rng = rand::thread_rng();
 		for (projectile, point) in p {
@@ -126,37 +132,44 @@ impl<'a> World {
 			);
 		}
 	}
+	*/
 
 	fn collide_projectile_ship(
 		&mut self,
-		ct: &content::Content,
-		particles: &mut Vec<ParticleBuilder>,
+		res: &mut StepResources,
 		projectile_h: ColliderHandle,
 		ship_h: ColliderHandle,
 	) {
 		let projectile = self.projectiles.get(&projectile_h);
-		let ship = self.ships.get_mut(&ship_h);
+		let ship = self
+			.ships
+			.get_mut(self.collider_ship_table.get(&ship_h).unwrap());
 		if projectile.is_none() || ship.is_none() {
 			return;
 		}
 		let projectile = projectile.unwrap();
 		let ship = ship.unwrap();
 
-		let hit = ship
-			.ship
-			.handle_projectile_collision(ct, &projectile.projectile);
-		let s = ship.physics_handle;
-		if hit {
+		let ship_d = res.dt.get_ship_mut(ship.data_handle).unwrap();
+
+		// TODO: check faction
+		ship_d.apply_damage(projectile.content.damage);
+
+		if true {
 			let pr = self
 				.wrapper
 				.rigid_body_set
 				.get(projectile.rigid_body)
 				.unwrap();
-			let v = util::rigidbody_velocity(pr).normalize() * projectile.projectile.content.force;
+			let v = util::rigidbody_velocity(pr).normalize() * projectile.content.force;
 			let pos = util::rigidbody_position(pr);
 			let _ = pr;
 
-			let r = self.wrapper.rigid_body_set.get_mut(s.0).unwrap();
+			let r = self
+				.wrapper
+				.rigid_body_set
+				.get_mut(ship.rigid_body)
+				.unwrap();
 			r.apply_impulse_at_point(vector![v.x, v.y], point![pos.x, pos.y], true);
 
 			// Borrow again, we can only have one at a time
@@ -168,16 +181,17 @@ impl<'a> World {
 			let pos = util::rigidbody_position(pr);
 			let angle = util::rigidbody_rotation(pr).angle(Vector2 { x: 1.0, y: 0.0 });
 
-			match &projectile.projectile.content.impact_effect {
+			match &projectile.content.impact_effect {
 				None => {}
 				Some(x) => {
-					let effect = ct.get_effect(*x);
-					let (_, sr) = self.get_ship_body(s).unwrap();
+					let effect = res.ct.get_effect(*x);
+					let r = ship.rigid_body;
+					let sr = self.get_rigid_body(r).unwrap();
 					let parent_velocity = util::rigidbody_velocity(pr);
 					let target_velocity =
 						sr.velocity_at_point(&nalgebra::Point2::new(pos.x, pos.y));
 
-					particles.push(ParticleBuilder::from_content(
+					res.particles.push(ParticleBuilder::from_content(
 						effect,
 						pos,
 						-angle,
@@ -198,27 +212,41 @@ impl<'a> World {
 // Public methods
 impl<'a> World {
 	/// Create a new physics system
-	pub fn new() -> Self {
+	pub fn new(ct: &content::Content, dt: &GameData, system: content::SystemHandle) -> Self {
 		let (collision_send, collision_queue) = crossbeam::channel::unbounded();
 		let (contact_force_send, _) = crossbeam::channel::unbounded();
 
-		Self {
+		let mut w = Self {
+			system,
 			wrapper: Wrapper::new(),
 			projectiles: HashMap::new(),
 			ships: HashMap::new(),
+			collider_ship_table: HashMap::new(),
 			collision_handler: ChannelEventCollector::new(collision_send, contact_force_send),
 			collision_queue,
+		};
+
+		// TODO: guarantee not touching
+		// TODO: add, remove ships each tick
+		// Maybe store position in gamedata?
+		let mut rng = rand::thread_rng();
+		for s in dt.iter_ships() {
+			w.add_ship(
+				ct,
+				s,
+				Point2 {
+					x: rng.gen_range(-500.0..=500.0),
+					y: rng.gen_range(-500.0..=500.0),
+				},
+			);
 		}
+
+		return w;
 	}
 
 	/// Add a ship to this physics system
-	pub fn add_ship(
-		&mut self,
-		ct: &content::Content,
-		ship: object::Ship,
-		position: Point2<f32>,
-	) -> ShipPhysicsHandle {
-		let ship_content = ct.get_ship(ship.handle);
+	pub fn add_ship(&mut self, ct: &content::Content, ship: &Ship, position: Point2<f32>) {
+		let ship_content = ct.get_ship(ship.get_content());
 		let cl = ColliderBuilder::convex_decomposition(
 			&ship_content.collision.points[..],
 			&ship_content.collision.indices[..],
@@ -242,42 +270,60 @@ impl<'a> World {
 			&mut self.wrapper.rigid_body_set,
 		);
 
-		let h = ShipPhysicsHandle(r, c);
-		self.ships
-			.insert(c, objects::ShipWorldObject::new(ct, ship, h));
-		return h;
+		self.collider_ship_table.insert(c, ship.get_handle());
+		self.ships.insert(
+			ship.get_handle(),
+			objects::ShipWorldObject::new(
+				ct,
+				ship.get_handle(),
+				Box::new(behavior::Null::new()),
+				r,
+				c,
+			),
+		);
 	}
 
 	/// Step this physics system by `t` seconds
-	pub fn step(&mut self, t: f32, ct: &content::Content, particles: &mut Vec<ParticleBuilder>) {
+	pub fn step(&mut self, mut res: StepResources) -> StepOutput {
+		let mut output = StepOutput {
+			player_position: Point2 { x: 0.0, y: 0.0 },
+		};
+
 		// Run ship updates
 		// TODO: maybe reorganize projectile creation?
-		let mut projectiles = Vec::new();
+		//let mut projectiles = Vec::new();
 		let mut to_remove = Vec::new();
 		for (_, s) in &mut self.ships {
-			let r = &mut self.wrapper.rigid_body_set[s.physics_handle.0];
-			let c = &mut self.wrapper.collider_set[s.physics_handle.1];
+			let r = &mut self.wrapper.rigid_body_set[s.rigid_body];
+			let c = &mut self.wrapper.collider_set[s.collider];
+
+			if s.data_handle == res.player {
+				s.controls = res.player_controls.clone();
+				output.player_position = util::rigidbody_position(r);
+			} else {
+				s.update_controls(&res);
+			}
 
 			// TODO: unified step info struct
-			s.step(ct, particles, r, c, t);
-			if s.controls.guns {
-				projectiles.push((s.physics_handle, s.ship.fire_guns()));
-			}
+			s.step(&mut res, r, c);
+			//if s.controls.guns {
+			//	projectiles.push((s.physics_handle, s.ship.fire_guns()));
+			//}
 
-			if s.remove_from_world() {
-				to_remove.push(s.physics_handle);
-				continue;
-			}
-		}
-		for (s, p) in projectiles {
-			self.add_projectiles(s, p);
+			//if s.remove_from_world() {
+			//	to_remove.push(s.physics_handle);
+			//	continue;
+			//}
 		}
+		//for (s, p) in projectiles {
+		//	self.add_projectiles(s, p);
+		//}
 		for s in to_remove {
 			self.remove_ship(s);
 		}
 
 		// Update physics
-		self.wrapper.step(t, &self.collision_handler);
+		self.wrapper.step(res.t, &self.collision_handler);
 
 		// Handle collision events
 		while let Ok(event) = &self.collision_queue.try_recv() {
@@ -294,19 +340,21 @@ impl<'a> World {
 				};
 
 				let p = self.projectiles.get(&a);
-				let s = self.ships.get_mut(&b);
+				let s = self
+					.ships
+					.get_mut(self.collider_ship_table.get(&b).unwrap());
 				if p.is_none() || s.is_none() {
 					continue;
 				}
-				self.collide_projectile_ship(ct, particles, a, b);
+				self.collide_projectile_ship(&mut res, a, b);
 			}
 		}
 
 		// Delete projectiles
 		let mut to_remove = Vec::new();
 		for (c, p) in &mut self.projectiles {
-			p.projectile.tick(t);
-			if p.projectile.is_expired() {
+			p.tick(res.t);
+			if p.is_expired() {
 				to_remove.push(*c);
 			}
 		}
@@ -315,10 +363,10 @@ impl<'a> World {
 		for c in to_remove {
 			let (pr, p) = self.remove_projectile(c).unwrap();
 
-			match &p.projectile.content.expire_effect {
+			match &p.content.expire_effect {
 				None => {}
 				Some(x) => {
-					let x = ct.get_effect(*x);
+					let x = res.ct.get_effect(*x);
 					let pos = util::rigidbody_position(&pr);
 					let vel = util::rigidbody_velocity(&pr);
 					let angle = util::rigidbody_rotation(&pr).angle(Vector2 { x: 1.0, y: 0.0 });
@@ -332,7 +380,7 @@ impl<'a> World {
 						velocity
 					};
 
-					particles.push(ParticleBuilder::from_content(
+					res.particles.push(ParticleBuilder::from_content(
 						x,
 						pos,
 						-angle,
@@ -342,6 +390,12 @@ impl<'a> World {
 				}
 			};
 		}
+
+		return output;
+	}
+
+	pub fn get_ship(&self, ship: GameShipHandle) -> Option<&ShipWorldObject> {
+		self.ships.get(&ship)
 	}
 
 	/// Get a rigid body from a handle
@@ -354,29 +408,13 @@ impl<'a> World {
 		self.wrapper.rigid_body_set.get_mut(r)
 	}
 
-	/// Get a ship from a handle
-	pub fn get_ship_mut(&mut self, s: &ShipPhysicsHandle) -> Option<&mut objects::ShipWorldObject> {
-		self.ships.get_mut(&s.1)
-	}
-
-	/// Get a ship and its rigidbody from a handle
-	pub fn get_ship_body(
-		&self,
-		s: ShipPhysicsHandle,
-	) -> Option<(&objects::ShipWorldObject, &RigidBody)> {
-		Some((self.ships.get(&s.1)?, self.wrapper.rigid_body_set.get(s.0)?))
-	}
-
 	/// Iterate over all ships in this physics system
 	pub fn iter_ship_body(
 		&self,
 	) -> impl Iterator<Item = (&objects::ShipWorldObject, &RigidBody)> + '_ {
-		self.ships.values().map(|x| {
-			(
-				x,
-				self.wrapper.rigid_body_set.get(x.physics_handle.0).unwrap(),
-			)
-		})
+		self.ships
+			.values()
+			.map(|x| (x, self.wrapper.rigid_body_set.get(x.rigid_body).unwrap()))
 	}
 
 	/// Iterate over all ships in this physics system