Cargo.toml

@@ -10,12 +10,6 @@ incremental = true
 codegen-units = 256
 rpath = false
 
-# Rapier is a LOT faster with optimizations,
-# make sure they're always enabled
-[profile.dev.package.rapier2d]
-opt-level = 3
-codegen-units = 1
-
 [profile.release]
 opt-level = 3
 debug = false

TODO.md

@@ -1,8 +1,7 @@
 # Specific projects
 
 ## Currently working on:
- - first: remove object array
- - first: sticky particles
+ - first: fix particles & physics
  - clickable buttons
  - planet outfitter
 

crates/content/src/lib.rs

@@ -303,11 +303,6 @@ impl Content {
 		return &self.sprite_atlas.atlas_list;
 	}
 
-	/// Get sprite atlas metadata
-	pub fn get_atlas(&self) -> &SpriteAtlas {
-		return &self.sprite_atlas;
-	}
-
 	/// Get a texture by its index
 	pub fn get_image(&self, idx: NonZeroU32) -> &SpriteAtlasImage {
 		&self.sprite_atlas.get_by_idx(idx)

crates/content/src/spriteautomaton.rs

@@ -313,9 +313,4 @@ impl SpriteAutomaton {
 			fade: self.current_edge_progress / self.current_edge_duration,
 		};
 	}
-
-	/// Get the sprite this automaton is using
-	pub fn get_sprite(&self) -> SpriteHandle {
-		self.sprite
-	}
 }

crates/galactica/src/game.rs

@@ -1,28 +1,45 @@
 use galactica_content::{Content, FactionHandle, OutfitHandle, ShipHandle, SystemHandle};
 use galactica_playeragent::PlayerAgent;
 use galactica_system::data::ShipPersonality;
-use galactica_system::phys::{PhysImage, PhysSim, PhysSimShipHandle, PhysStepResources};
+use galactica_system::phys::{
+	ParticleBuilder, PhysSim, PhysSimShipHandle, PhysStepResources, Wrapper,
+};
 use galactica_util::timing::Timing;
 use nalgebra::Point2;
+use rand::seq::SliceRandom;
 use std::time::Instant;
 
+#[derive(Clone)]
+pub struct GameState {
+	pub systemsim: PhysSim,
+	pub timing: Timing,
+	pub start_instant: Instant,
+}
+
+unsafe impl Send for GameState {}
+unsafe impl Sync for GameState {}
+
 pub struct Game {
 	// Core game data
 	ct: Content,
-	systemsim: PhysSim,
-	timing: Timing,
-	start_instant: Instant,
+	state: GameState,
 
 	// Metadata
+	wrapper: Wrapper, // Physics computer
 	time_scale: f32,
 	last_update: Instant,
+
+	/// Particles to create this frame.
+	/// Must be cleared at the start of every frame
+	/// TODO: better way to handle this?
+	new_particles: Vec<ParticleBuilder>,
 }
 
 unsafe impl<'a> Send for Game {}
 
 impl<'a> Game {
 	pub fn make_player(&mut self) -> PhysSimShipHandle {
-		let player = self.systemsim.add_ship(
+		let player = self.state.systemsim.add_ship(
 			&self.ct,
 			ShipHandle { index: 0 },
 			FactionHandle { index: 0 },
@@ -30,7 +47,7 @@ impl<'a> Game {
 			Point2::new(0.0, 4000.0),
 		);
 
-		let s = self.systemsim.get_ship_mut(&player).unwrap();
+		let s = self.state.systemsim.get_ship_mut(&player).unwrap();
 		s.add_outfits(
 			&self.ct,
 			[
@@ -82,46 +99,52 @@ impl<'a> Game {
 			],
 		);
 
-		Game {
-			ct,
+		let state = GameState {
 			systemsim,
 			timing: Timing::new(),
 			start_instant: Instant::now(),
+		};
+
+		Game {
+			ct,
+			state,
+
+			wrapper: Wrapper::new(),
 			last_update: Instant::now(),
 			time_scale: 1.0,
+			new_particles: Vec::new(),
 		}
 	}
 
 	pub fn update_player_controls(&mut self, player: &mut PlayerAgent) {
-		self.systemsim.update_player_controls(&self.ct, player)
+		self.state
+			.systemsim
+			.update_player_controls(&self.ct, player)
 	}
 
-	pub fn step(&mut self, phys_img: &PhysImage) {
-		self.timing.start_frame();
-		self.systemsim.step(
-			PhysStepResources {
-				ct: &self.ct,
-				t: self.last_update.elapsed().as_secs_f32() * self.time_scale,
-				timing: &mut self.timing,
-			},
-			phys_img,
-		);
+	pub fn get_state(&self) -> &GameState {
+		&self.state
+	}
+
+	pub fn get_particles(&self) -> &Vec<ParticleBuilder> {
+		&self.new_particles
+	}
+
+	pub fn update(&mut self) {
+		self.state.timing.start_frame();
+		let t: f32 = self.last_update.elapsed().as_secs_f32() * self.time_scale;
+		self.new_particles.clear();
+
+		self.state.systemsim.step(PhysStepResources {
+			ct: &self.ct,
+			particles: &mut self.new_particles,
+			timing: &mut self.state.timing,
+			wrapper: &mut self.wrapper,
+			t,
+		});
 
 		self.last_update = Instant::now();
-		self.timing.mark_frame();
-	}
-
-	pub fn update_image(&self, phys_img: &mut PhysImage) {
-		self.systemsim.update_image(phys_img);
-	}
-}
-
-impl Game {
-	pub fn get_timing(&self) -> &Timing {
-		&self.timing
-	}
-
-	pub fn get_current_time(&self) -> f32 {
-		self.start_instant.elapsed().as_secs_f32()
+		self.new_particles.shuffle(&mut rand::thread_rng());
+		self.state.timing.mark_frame();
 	}
 }

crates/galactica/src/main.rs

@@ -4,10 +4,7 @@ use anyhow::{bail, Result};
 use galactica_content::{Content, SystemHandle};
 use galactica_playeragent::{PlayerAgent, PlayerStatus};
 use galactica_render::RenderInput;
-use galactica_system::{
-	data::ShipState,
-	phys::{PhysImage, PhysSimShipHandle},
-};
+use galactica_system::{data::ShipState, phys::PhysSimShipHandle};
 use galactica_util::constants::ASSET_CACHE;
 use nalgebra::Vector2;
 use std::{
@@ -64,20 +61,19 @@ fn try_main() -> Result<()> {
 		gpu.window().inner_size().width as f32 / gpu.window().inner_size().height as f32,
 	);
 
-	let mut phys_img = PhysImage::new();
-
 	event_loop.run(move |event, _, control_flow| {
 		match event {
 			Event::RedrawRequested(window_id) if window_id == gpu.window().id() => {
 				let render_input = RenderInput {
 					camera_pos: player.camera.pos,
 					camera_zoom: player.camera.zoom,
-					current_time: game.get_current_time(),
+					current_time: game.get_state().start_instant.elapsed().as_secs_f32(),
 					ct: &content,
-					phys_img: &phys_img,
+					systemsim: &game.get_state().systemsim,
+					particles: game.get_particles(),
 					player: &player,
 					current_system: SystemHandle { index: 0 },
-					timing: game.get_timing().clone(),
+					timing: game.get_state().timing.clone(),
 				};
 
 				match gpu.render(render_input) {
@@ -91,19 +87,29 @@ fn try_main() -> Result<()> {
 
 			Event::MainEventsCleared => {
 				game.update_player_controls(&mut player);
-				game.step(&phys_img);
-				game.update_image(&mut phys_img);
+				game.update();
 
 				// TODO: clean up
 				let player_status = {
 					let pos = {
-						let o = phys_img.get_ship(&PhysSimShipHandle(player.ship.unwrap()));
+						let o = &game
+							.get_state()
+							.systemsim
+							.get_ship(&PhysSimShipHandle(player.ship.unwrap()));
 						if let Some(o) = o {
-							match o.ship.get_data().get_state() {
+							match o.get_data().get_state() {
 								ShipState::Landing { .. }
 								| ShipState::UnLanding { .. }
 								| ShipState::Collapsing { .. }
-								| ShipState::Flying { .. } => Some(*o.rigidbody.translation()),
+								| ShipState::Flying { .. } => {
+									let r =
+										&game.get_state().systemsim.get_rigid_body(o.rigid_body);
+									if let Some(r) = r {
+										Some(*r.translation())
+									} else {
+										None
+									}
+								}
 
 								ShipState::Landed { target } => {
 									let b = content.get_system_object(*target);

crates/packer/src/lib.rs

@@ -76,11 +76,6 @@ impl SpriteAtlas {
 		self.path_map.get(path).map(|x| *x)
 	}
 
-	/// Iterate all images in this atlas
-	pub fn iter_images(&self) -> impl Iterator<Item = &SpriteAtlasImage> {
-		self.index.iter()
-	}
-
 	/// Get the number of images in this atlas
 	pub fn len(&self) -> u32 {
 		self.index.len() as u32

crates/render/shaders/particle.wgsl

@@ -0,0 +1,141 @@
+// INCLUDE: global uniform header
+
+struct InstanceInput {
+	@location(2) position: vec2<f32>,
+	@location(3) velocity: vec2<f32>,
+	@location(4) angle: f32,
+	@location(5) angvel: f32,
+	@location(6) size: f32,
+	@location(7) created: f32,
+	@location(8) expires: f32,
+	@location(9) fade: f32,
+	@location(10) texture_index: vec2<u32>,
+	@location(11) texture_fade: f32,
+};
+
+struct VertexInput {
+	@location(0) position: vec3<f32>,
+	@location(1) texture_coords: vec2<f32>,
+}
+
+struct VertexOutput {
+	@builtin(position) position: vec4<f32>,
+	@location(0) tween: f32,
+	@location(1) fade: f32,
+	@location(2) texture_index_a: u32,
+	@location(3) texture_coords_a: vec2<f32>,
+	@location(4) texture_index_b: u32,
+	@location(5) texture_coords_b: vec2<f32>,
+}
+
+
+@group(0) @binding(0)
+var texture_array: binding_array<texture_2d<f32>>;
+@group(0) @binding(1)
+var sampler_array: binding_array<sampler>;
+
+@vertex
+fn vertex_main(
+	vertex: VertexInput,
+	instance: InstanceInput,
+) -> VertexOutput {
+
+	var out: VertexOutput;
+
+	// Skip expired particles
+	if instance.expires < global_data.current_time.x {
+		out.tween = 0.0;
+		out.texture_index_a = u32(0);
+		out.texture_index_b = u32(0);
+		out.texture_coords_a = vec2(0.0, 0.0);
+		out.texture_coords_b = vec2(0.0, 0.0);
+		out.position = vec4<f32>(2.0, 2.0, 0.0, 1.0);
+		return out;
+	}
+
+	let age = global_data.current_time.x - instance.created;
+
+
+	// Apply transformations
+	let angle = instance.angle + age * instance.angvel;
+
+	var scale: f32 = instance.size / global_data.camera_zoom.x;
+	var pos: vec2<f32> = vec2(
+		vertex.position.x * scale * global_sprites[instance.sprite_index].aspect,
+		vertex.position.y * scale
+	);
+
+	// Correct angle, since sprites point north and zero degrees is east
+	pos = mat2x2(
+		vec2(cos(angle - 1.5708), sin(angle - 1.5708)),
+		vec2(-sin(angle - 1.5708), cos(angle - 1.5708))
+	) * pos;
+
+	var trans: vec2<f32> = (instance.position + (instance.velocity * age) - global_data.camera_position);
+
+	pos = vec2(
+		pos.x / global_data.window_aspect.x,
+		pos.y
+	);
+
+	pos = pos + vec2(
+		trans.x / (global_data.camera_zoom.x / 2.0) / global_data.window_aspect.x,
+		trans.y / (global_data.camera_zoom.x / 2.0)
+	);
+
+
+	out.position = vec4(pos, 0.0, 1.0);
+
+	if instance.expires - global_data.current_time.x <= instance.fade {
+		out.fade = (instance.expires - global_data.current_time.x) / instance.fade;
+	} else {
+		out.fade = 1.0;
+	}
+
+	// Compute texture coordinates
+	let frame = animate(instance.sprite_index, age, 0.0);
+	out.tween = instance.texture_fade;
+
+	let t = global_atlas[instance.texture_index.x];
+	out.texture_index_a = u32(t.atlas_texture);
+	out.texture_coords_a = vec2(t.xpos, t.ypos);
+	if vertex.texture_coords.x == 1.0 {
+		out.texture_coords_a = out.texture_coords_a + vec2(t.width, 0.0);
+	}
+	if vertex.texture_coords.y == 1.0 {
+		out.texture_coords_a = out.texture_coords_a + vec2(0.0, t.height);
+	}
+
+	let b = global_atlas[instance.texture_index.y];
+	out.texture_index_b = u32(b.atlas_texture);
+	out.texture_coords_b = vec2(b.xpos, b.ypos);
+	if vertex.texture_coords.x == 1.0 {
+		out.texture_coords_b = out.texture_coords_b + vec2(b.width, 0.0);
+	}
+	if vertex.texture_coords.y == 1.0 {
+		out.texture_coords_b = out.texture_coords_b + vec2(0.0, b.height);
+	}
+
+	return out;
+}
+
+
+@fragment
+fn fragment_main(in: VertexOutput) -> @location(0) vec4<f32> {
+
+	return mix(
+		textureSampleLevel(
+			texture_array[in.texture_index_a],
+			sampler_array[0],
+			in.texture_coords_a,
+			0.0
+		).rgba,
+		textureSampleLevel(
+			texture_array[in.texture_index_b],
+			sampler_array[0],
+			in.texture_coords_b,
+			0.0
+		).rgba,
+		in.tween
+	) * vec4(1.0, 1.0, 1.0, in.fade);
+}

crates/render/src/gpustate/mod.rs

@@ -20,6 +20,7 @@ pub struct GPUState {
 
 	object_pipeline: wgpu::RenderPipeline,
 	starfield_pipeline: wgpu::RenderPipeline,
+	//particle_pipeline: wgpu::RenderPipeline,
 	ui_pipeline: wgpu::RenderPipeline,
 	radialbar_pipeline: wgpu::RenderPipeline,
 

crates/render/src/gpustate/new.rs

@@ -168,6 +168,23 @@ impl GPUState {
 			.set_bind_group_layouts(bind_group_layouts)
 			.build();
 
+		/*
+		let particle_pipeline = PipelineBuilder::new("particle", &device)
+			.set_shader(&preprocess_shader(
+				&include_str!(concat!(
+					env!("CARGO_MANIFEST_DIR"),
+					"/shaders/",
+					"particle.wgsl"
+				)),
+				&global_uniform,
+				1,
+			))
+			.set_format(config.format)
+			.set_triangle(true)
+			.set_vertex_buffer(vertex_buffers.get_particle())
+			.set_bind_group_layouts(bind_group_layouts)
+			.build();*/
+
 		let radialbar_pipeline = PipelineBuilder::new("radialbar", &device)
 			.set_shader(&preprocess_shader(
 				&include_str!(concat!(
@@ -213,6 +230,7 @@ impl GPUState {
 			object_pipeline,
 			starfield_pipeline,
 			ui_pipeline,
+			//particle_pipeline,
 			radialbar_pipeline,
 
 			state,

crates/render/src/gpustate/phys.rs

@@ -10,35 +10,37 @@ use crate::{
 };
 
 impl GPUState {
-	pub(super) fn phys_push_ships(
+	pub(super) fn phys_push_ship(
 		&mut self,
 		input: &RenderInput,
 		// NE and SW corners of screen
 		screen_clip: (Point2<f32>, Point2<f32>),
 	) {
-		for s in input.phys_img.iter_ships() {
+		for ship in input.systemsim.iter_ships() {
+			// TODO: move collapse sequence here?
+
 			let ship_pos;
 			let ship_ang;
 			let ship_cnt;
-			match s.ship.get_data().get_state() {
+			match ship.get_data().get_state() {
 				ShipState::Dead | ShipState::Landed { .. } => continue,
 
 				ShipState::Collapsing { .. } | ShipState::Flying { .. } => {
-					let r = &s.rigidbody;
+					let r = input.systemsim.get_rigid_body(ship.rigid_body).unwrap();
 					let pos = *r.translation();
 					ship_pos = Point3::new(pos.x, pos.y, 1.0);
 					let ship_rot = r.rotation();
 					ship_ang = ship_rot.angle();
-					ship_cnt = input.ct.get_ship(s.ship.get_data().get_content());
+					ship_cnt = input.ct.get_ship(ship.get_data().get_content());
 				}
 
 				ShipState::UnLanding { current_z, .. } | ShipState::Landing { current_z, .. } => {
-					let r = &s.rigidbody;
+					let r = input.systemsim.get_rigid_body(ship.rigid_body).unwrap();
 					let pos = *r.translation();
 					ship_pos = Point3::new(pos.x, pos.y, *current_z);
 					let ship_rot = r.rotation();
 					ship_ang = ship_rot.angle();
-					ship_cnt = input.ct.get_ship(s.ship.get_data().get_content());
+					ship_cnt = input.ct.get_ship(ship.get_data().get_content());
 				}
 			}
 
@@ -83,7 +85,7 @@ impl GPUState {
 			);
 
 			// Push this object's instance
-			let anim_state = s.ship.get_anim_state();
+			let anim_state = ship.get_anim_state();
 			self.state.push_object_buffer(ObjectInstance {
 				texture_index: anim_state.texture_index(),
 				texture_fade: anim_state.fade,
@@ -91,7 +93,7 @@ impl GPUState {
 			});
 
 			if {
-				let is_flying = match s.ship.get_data().get_state() {
+				let is_flying = match ship.get_data().get_state() {
 					ShipState::Flying { .. }
 					| ShipState::UnLanding { .. }
 					| ShipState::Landing { .. } => true,
@@ -99,7 +101,7 @@ impl GPUState {
 				};
 				is_flying
 			} {
-				for (engine_point, anim) in s.ship.iter_engine_anim() {
+				for (engine_point, anim) in ship.iter_engine_anim() {
 					self.state.queue.write_buffer(
 						&self.state.global_uniform.object_buffer,
 						ObjectData::SIZE * self.state.get_object_counter() as u64,
@@ -133,18 +135,18 @@ impl GPUState {
 		}
 	}
 
-	pub(super) fn phys_push_projectiles(
+	pub(super) fn phys_push_projectile(
 		&mut self,
 		input: &RenderInput,
 		// NE and SW corners of screen
 		screen_clip: (Point2<f32>, Point2<f32>),
 	) {
-		for p in input.phys_img.iter_projectiles() {
-			let r = &p.rigidbody;
+		for p in input.systemsim.iter_projectiles() {
+			let r = input.systemsim.get_rigid_body(p.rigid_body).unwrap();
 			let proj_pos = *r.translation();
 			let proj_rot = r.rotation();
 			let proj_ang = proj_rot.angle();
-			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?
@@ -177,14 +179,14 @@ impl GPUState {
 					ypos: proj_pos.y,
 					zpos: 1.0,
 					angle: proj_ang,
-					size: 0f32.max(proj_cnt.size + p.projectile.size_rng),
+					size: 0f32.max(proj_cnt.size + p.size_rng),
 					parent: 0,
 					is_child: 0,
 					_padding: Default::default(),
 				}]),
 			);
 
-			let anim_state = p.projectile.get_anim_state();
+			let anim_state = p.get_anim_state();
 			self.state.push_object_buffer(ObjectInstance {
 				texture_index: anim_state.texture_index(),
 				texture_fade: anim_state.fade,
@@ -249,68 +251,4 @@ impl GPUState {
 			});
 		}
 	}
-
-	pub(super) fn phys_push_effects(
-		&mut self,
-		input: &RenderInput,
-		// NE and SW corners of screen
-		screen_clip: (Point2<f32>, Point2<f32>),
-	) {
-		for p in input.phys_img.iter_effects() {
-			let r = &p.rigidbody;
-			let pos = *r.translation();
-			let rot = r.rotation();
-			let ang = rot.angle();
-
-			// Position adjusted for parallax
-			// TODO: adjust parallax for zoom?
-			// 1.0 is z-coordinate, which is constant for projectiles
-			let adjusted_pos = (pos - input.camera_pos) / 1.0;
-
-			// Game dimensions of this sprite post-scale.
-			// Post-scale width or height, whichever is larger.
-			// This is in game units.
-			//
-			// We take the maximum to account for rotated sprites.
-			let m = (p.effect.size / 1.0)
-				* input
-					.ct
-					.get_sprite(p.effect.anim.get_sprite())
-					.aspect
-					.max(1.0);
-
-			// Don't draw sprites that are off the screen
-			if adjusted_pos.x < screen_clip.0.x - m
-				|| adjusted_pos.y > screen_clip.0.y + m
-				|| adjusted_pos.x > screen_clip.1.x + m
-				|| adjusted_pos.y < screen_clip.1.y - m
-			{
-				continue;
-			}
-
-			let idx = self.state.get_object_counter();
-			// Write this object's location data
-			self.state.queue.write_buffer(
-				&self.state.global_uniform.object_buffer,
-				ObjectData::SIZE * idx as u64,
-				bytemuck::cast_slice(&[ObjectData {
-					xpos: pos.x,
-					ypos: pos.y,
-					zpos: 1.0,
-					angle: ang,
-					size: p.effect.size,
-					parent: 0,
-					is_child: 0,
-					_padding: Default::default(),
-				}]),
-			);
-
-			let anim_state = p.effect.anim.get_texture_idx();
-			self.state.push_object_buffer(ObjectInstance {
-				texture_index: anim_state.texture_index(),
-				texture_fade: anim_state.fade,
-				object_index: idx as u32,
-			});
-		}
-	}
 }

crates/render/src/gpustate/render.rs

@@ -1,12 +1,17 @@
 use anyhow::Result;
 use bytemuck;
 use galactica_system::{data::ShipState, phys::PhysSimShipHandle};
+use galactica_util::constants::PARTICLE_SPRITE_INSTANCE_LIMIT;
 use glyphon::Resolution;
 use nalgebra::Point2;
 use std::iter;
 use wgpu;
 
-use crate::{globaluniform::GlobalDataContent, vertexbuffer::consts::SPRITE_INDICES, RenderInput};
+use crate::{
+	globaluniform::GlobalDataContent,
+	vertexbuffer::{consts::SPRITE_INDICES, types::ParticleInstance},
+	RenderInput,
+};
 
 impl<'a> super::GPUState {
 	/// Render routines while player is flying
@@ -41,6 +46,25 @@ impl<'a> super::GPUState {
 			timestamp_writes: None,
 		});
 
+		// Write all new particles to GPU buffer
+		for i in input.particles.iter() {
+			let sprite = input.ct.get_sprite(i.sprite);
+			let texture_a = sprite.get_first_frame(); // ANIMATE
+
+			self.state.push_particle_buffer(ParticleInstance {
+				position: [i.pos.x, i.pos.y],
+				velocity: i.velocity.into(),
+				angle: i.angle,
+				angvel: i.angvel,
+				size: i.size,
+				texture_index: [texture_a, texture_a],
+				texture_fade: 1.0,
+				created: input.current_time,
+				expires: input.current_time + i.lifetime,
+				fade: i.fade,
+			});
+		}
+
 		// Create sprite instances
 
 		// Game coordinates (relative to camera) of ne and sw corners of screen.
@@ -52,9 +76,8 @@ impl<'a> super::GPUState {
 		// The order inside ships and projectiles doesn't matter,
 		// but ships should always be under projectiles.
 		self.phys_push_system(&input, (clip_ne, clip_sw));
-		self.phys_push_ships(&input, (clip_ne, clip_sw));
-		self.phys_push_projectiles(&input, (clip_ne, clip_sw));
-		self.phys_push_effects(&input, (clip_ne, clip_sw));
+		self.phys_push_ship(&input, (clip_ne, clip_sw));
+		self.phys_push_projectile(&input, (clip_ne, clip_sw));
 		self.ui.draw(&input, &mut self.state);
 
 		// These should match the indices in each shader,
@@ -86,6 +109,19 @@ impl<'a> super::GPUState {
 			0..self.state.get_object_counter(),
 		);
 
+		/*
+		// Particle pipeline
+		self.state
+			.vertex_buffers
+			.get_particle()
+			.set_in_pass(&mut render_pass);
+		render_pass.set_pipeline(&self.particle_pipeline);
+		render_pass.draw_indexed(
+			0..SPRITE_INDICES.len() as u32,
+			0,
+			0..PARTICLE_SPRITE_INSTANCE_LIMIT as _,
+		); */
+
 		// Ui pipeline
 		self.state
 			.vertex_buffers
@@ -283,10 +319,9 @@ impl<'a> super::GPUState {
 		self.state.frame_reset();
 
 		match input
-			.phys_img
+			.systemsim
 			.get_ship(&PhysSimShipHandle(input.player.ship.unwrap()))
 			.unwrap()
-			.ship
 			.get_data()
 			.get_state()
 		{

crates/render/src/renderinput.rs

@@ -1,6 +1,6 @@
 use galactica_content::{Content, SystemHandle};
 use galactica_playeragent::PlayerAgent;
-use galactica_system::phys::PhysImage;
+use galactica_system::phys::{ParticleBuilder, PhysSim};
 use galactica_util::timing::Timing;
 use nalgebra::Vector2;
 
@@ -19,7 +19,7 @@ pub struct RenderInput<'a> {
 	pub camera_zoom: f32,
 
 	/// The world state to render
-	pub phys_img: &'a PhysImage,
+	pub systemsim: &'a PhysSim,
 
 	// TODO: handle overflow. is it a problem?
 	/// The current time, in seconds
@@ -28,6 +28,9 @@ pub struct RenderInput<'a> {
 	/// Game content
 	pub ct: &'a Content,
 
+	/// Particles to spawn during this frame
+	pub particles: &'a Vec<ParticleBuilder>,
+
 	/// Time we spent in each part of the game loop
 	pub timing: Timing,
 }

crates/render/src/renderstate.rs

@@ -1,6 +1,7 @@
 use galactica_content::Content;
 use galactica_util::constants::{
-	OBJECT_SPRITE_INSTANCE_LIMIT, RADIALBAR_SPRITE_INSTANCE_LIMIT, UI_SPRITE_INSTANCE_LIMIT,
+	OBJECT_SPRITE_INSTANCE_LIMIT, PARTICLE_SPRITE_INSTANCE_LIMIT, RADIALBAR_SPRITE_INSTANCE_LIMIT,
+	UI_SPRITE_INSTANCE_LIMIT,
 };
 use glyphon::{FontSystem, SwashCache, TextAtlas, TextRenderer};
 use std::rc::Rc;
@@ -11,7 +12,10 @@ use crate::{
 	globaluniform::GlobalUniform,
 	vertexbuffer::{
 		consts::{SPRITE_INDICES, SPRITE_VERTICES},
-		types::{ObjectInstance, RadialBarInstance, StarfieldInstance, TexturedVertex, UiInstance},
+		types::{
+			ObjectInstance, ParticleInstance, RadialBarInstance, StarfieldInstance, TexturedVertex,
+			UiInstance,
+		},
 		BufferObject, VertexBuffer,
 	},
 };
@@ -20,8 +24,13 @@ use crate::{
 pub(crate) struct VertexBuffers {
 	// Keeps track of length of each buffer
 	// Most of these are reset on each frame.
+	//
+	// The exception is particle_counter, which
+	// is never reset, and loops back to zero once
+	// it exceeds buffer length
 	object_counter: BufferAddress,
 	ui_counter: BufferAddress,
+	particle_counter: BufferAddress,
 	radialbar_counter: BufferAddress,
 	starfield_counter: BufferAddress,
 	starfield_limit: BufferAddress,
@@ -29,6 +38,7 @@ pub(crate) struct VertexBuffers {
 	object: Rc<VertexBuffer>,
 	starfield: Rc<VertexBuffer>,
 	ui: Rc<VertexBuffer>,
+	particle: Rc<VertexBuffer>,
 	radialbar: Rc<VertexBuffer>,
 }
 
@@ -37,6 +47,7 @@ impl<'a> VertexBuffers {
 		Self {
 			object_counter: 0,
 			ui_counter: 0,
+			particle_counter: 0,
 			radialbar_counter: 0,
 			starfield_counter: 0,
 			starfield_limit: ct.get_config().starfield_instance_limit,
@@ -65,6 +76,14 @@ impl<'a> VertexBuffers {
 				UI_SPRITE_INSTANCE_LIMIT,
 			)),
 
+			particle: Rc::new(VertexBuffer::new::<TexturedVertex, ParticleInstance>(
+				"particle",
+				&device,
+				Some(SPRITE_VERTICES),
+				Some(SPRITE_INDICES),
+				PARTICLE_SPRITE_INSTANCE_LIMIT,
+			)),
+
 			radialbar: Rc::new(VertexBuffer::new::<TexturedVertex, RadialBarInstance>(
 				"radial bar",
 				&device,
@@ -83,6 +102,10 @@ impl<'a> VertexBuffers {
 		&self.object
 	}
 
+	pub fn get_particle(&'a self) -> &'a Rc<VertexBuffer> {
+		&self.particle
+	}
+
 	pub fn get_radialbar(&'a self) -> &'a Rc<VertexBuffer> {
 		&self.radialbar
 	}
@@ -195,4 +218,20 @@ impl RenderState {
 	pub fn get_starfield_counter(&self) -> u32 {
 		self.vertex_buffers.starfield_counter as u32
 	}
+
+	pub fn push_particle_buffer(&mut self, instance: ParticleInstance) {
+		self.queue.write_buffer(
+			&self.vertex_buffers.particle.instances,
+			ParticleInstance::SIZE * self.vertex_buffers.particle_counter,
+			bytemuck::cast_slice(&[instance]),
+		);
+		self.vertex_buffers.particle_counter += 1;
+		if self.vertex_buffers.particle_counter == PARTICLE_SPRITE_INSTANCE_LIMIT {
+			self.vertex_buffers.particle_counter = 0;
+		}
+	}
+
+	//pub fn get_particle_counter(&self) -> u32 {
+	//	self.vertex_buffers.particle_counter as u32
+	//}
 }

crates/render/src/texturearray.rs

@@ -109,15 +109,28 @@ impl TextureArray {
 		let mut image_locations = AtlasArray::zeroed();
 
 		println!("sending to gpu");
-		for image in ct.get_atlas().iter_images() {
-			image_locations.data[image.idx.get() as usize] = AtlasImageLocation {
-				xpos: image.x,
-				ypos: image.y,
-				width: image.w,
-				height: image.h,
-				atlas_texture: image.atlas,
-				_padding: Default::default(),
-			};
+		for sprite in &ct.sprites {
+			for section in sprite.iter_sections() {
+				for idx in &section.frames {
+					// Some atlas entries may be written twice here,
+					// but that's not really a problem. They're all the same!
+					//
+					// This happens rarely---only when two different sections
+					// use the same frame.
+					let idx = NonZeroU32::new(*idx);
+					if idx.is_some() {
+						let image = ct.get_image(idx.unwrap());
+						image_locations.data[idx.unwrap().get() as usize] = AtlasImageLocation {
+							xpos: image.x,
+							ypos: image.y,
+							width: image.w,
+							height: image.h,
+							atlas_texture: image.atlas,
+							_padding: Default::default(),
+						};
+					}
+				}
+			}
 		}
 
 		let sampler = device.create_sampler(&wgpu::SamplerDescriptor {

crates/render/src/ui/manager.rs

@@ -25,11 +25,10 @@ impl UiManager {
 	/// Draw all ui elements
 	pub fn draw(&mut self, input: &RenderInput, state: &mut RenderState) {
 		let ship_handle = input.player.ship.unwrap();
-		let ship = &input
-			.phys_img
+		let ship = input
+			.systemsim
 			.get_ship(&PhysSimShipHandle(ship_handle))
-			.unwrap()
-			.ship;
+			.unwrap();
 
 		self.fps.update(input, state);
 

crates/render/src/ui/planet.rs

@@ -114,11 +114,10 @@ impl Planet {
 	pub fn draw(&mut self, input: &RenderInput, state: &mut RenderState) {
 		// Get required data
 		let ship_handle = input.player.ship.unwrap();
-		let ship_data = &input
-			.phys_img
+		let ship_data = input
+			.systemsim
 			.get_ship(&PhysSimShipHandle(ship_handle))
-			.unwrap()
-			.ship;
+			.unwrap();
 		let planet_handle = match ship_data.get_data().get_state() {
 			ShipState::Landed { target } => *target,
 			_ => unreachable!("tried to draw planet interface while not landed!"),

crates/render/src/ui/radar.rs

@@ -28,13 +28,13 @@ impl Radar {
 		// TODO: maybe a cleaner solution for last posititon?
 		// This is necessary because the player may be dead or landed
 		let player_ship = input
-			.phys_img
+			.systemsim
 			.get_ship(&galactica_system::phys::PhysSimShipHandle(
 				input.player.ship.unwrap(),
 			))
 			.unwrap();
 
-		match player_ship.ship.get_data().get_state() {
+		match player_ship.get_data().get_state() {
 			ShipState::Dead => {}
 
 			ShipState::Landed { target } => {
@@ -46,7 +46,12 @@ impl Radar {
 			| ShipState::Landing { .. }
 			| ShipState::Flying { .. }
 			| ShipState::Collapsing { .. } => {
-				self.last_player_position = (*player_ship.rigidbody.translation()).into();
+				let player_body = input
+					.systemsim
+					.get_rigid_body(player_ship.rigid_body)
+					.unwrap();
+
+				self.last_player_position = (*player_body.translation()).into();
 			}
 		};
 
@@ -106,9 +111,9 @@ impl Radar {
 		}
 
 		// Draw ships
-		for s in input.phys_img.iter_ships() {
-			let ship = input.ct.get_ship(s.ship.get_data().get_content());
-			let (color, z_scale) = match s.ship.get_data().get_state() {
+		for (s, r) in input.systemsim.iter_ship_body() {
+			let ship = input.ct.get_ship(s.get_data().get_content());
+			let (color, z_scale) = match s.get_data().get_state() {
 				ShipState::Dead | ShipState::Landed { .. } => {
 					continue;
 				}
@@ -124,16 +129,16 @@ impl Radar {
 					([0.2, 0.2, 0.2, 1.0], 1.0)
 				}
 				ShipState::Flying { .. } => {
-					let c = input.ct.get_faction(s.ship.get_data().get_faction()).color;
+					let c = input.ct.get_faction(s.get_data().get_faction()).color;
 					([c[0], c[1], c[2], 1.0], 1.0)
 				}
 			};
 			let size = (ship.size * input.ct.get_sprite(ship.sprite).aspect) * ship_scale * z_scale;
 			let p: Point2<f32> = {
-				if s.ship.collider == input.player.ship.unwrap() {
+				if s.collider == input.player.ship.unwrap() {
 					self.last_player_position
 				} else {
-					(*s.rigidbody.translation()).into()
+					(*r.translation()).into()
 				}
 			};
 			let d = (p - self.last_player_position) / radar_range;
@@ -153,7 +158,7 @@ impl Radar {
 				state.push_ui_buffer(UiInstance {
 					anchor: PositionAnchor::NwC.to_int(),
 					position: position.into(),
-					angle: player_ship.rigidbody.rotation().angle(),
+					angle: r.rotation().angle(),
 					size,
 					color,
 					texture_index: [texture_a, texture_a],

crates/render/src/ui/status.rs

@@ -20,42 +20,28 @@ impl Status {
 		let current_hull;
 		let max_hull;
 		let player_ship = input
-			.phys_img
+			.systemsim
 			.get_ship(&galactica_system::phys::PhysSimShipHandle(
 				input.player.ship.unwrap(),
 			))
 			.unwrap();
 
-		match player_ship.ship.get_data().get_state() {
+		match player_ship.get_data().get_state() {
 			ShipState::Dead => {
 				current_shields = 0.0;
 				current_hull = 0.0;
-				max_shields = player_ship
-					.ship
-					.get_data()
-					.get_outfits()
-					.get_shield_strength();
-				max_hull = input
-					.ct
-					.get_ship(player_ship.ship.get_data().get_content())
-					.hull;
+				max_shields = player_ship.get_data().get_outfits().get_shield_strength();
+				max_hull = input.ct.get_ship(player_ship.get_data().get_content()).hull;
 			}
 			ShipState::UnLanding { .. }
 			| ShipState::Landing { .. }
 			| ShipState::Landed { .. }
 			| ShipState::Collapsing { .. }
 			| ShipState::Flying { .. } => {
-				current_shields = player_ship.ship.get_data().get_shields();
-				current_hull = player_ship.ship.get_data().get_hull();
-				max_shields = player_ship
-					.ship
-					.get_data()
-					.get_outfits()
-					.get_shield_strength();
-				max_hull = input
-					.ct
-					.get_ship(player_ship.ship.get_data().get_content())
-					.hull;
+				current_shields = player_ship.get_data().get_shields();
+				current_hull = player_ship.get_data().get_hull();
+				max_shields = player_ship.get_data().get_outfits().get_shield_strength();
+				max_hull = input.ct.get_ship(player_ship.get_data().get_content()).hull;
 			}
 		}
 

crates/render/src/vertexbuffer/types.rs

@@ -224,6 +224,112 @@ impl BufferObject for UiInstance {
 	}
 }
 
+#[repr(C)]
+#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
+pub struct ParticleInstance {
+	/// World position of this particle
+	pub position: [f32; 2],
+
+	/// Velocity of this particle, in world coordinates
+	pub velocity: [f32; 2],
+
+	/// Angle of this particle, in radians
+	pub angle: f32,
+
+	/// Angular velocity of this particle, rad/sec
+	pub angvel: f32,
+
+	/// The height of this particle, in world units
+	pub size: f32,
+
+	/// The time, in seconds, at which this particle was created.
+	/// Time is kept by a variable in the global uniform.
+	pub created: f32,
+
+	/// The time, in seconds, at which this particle expires.
+	/// Time is kept by a variable in the global uniform.
+	pub expires: f32,
+
+	/// Fade this particle out over this many seconds as it expires
+	pub fade: f32,
+
+	/// What texture to use for this particle
+	pub texture_index: [u32; 2],
+	/// Fade parameter for texture index
+	pub texture_fade: f32,
+}
+
+impl BufferObject for ParticleInstance {
+	fn layout() -> wgpu::VertexBufferLayout<'static> {
+		wgpu::VertexBufferLayout {
+			array_stride: Self::SIZE,
+			step_mode: wgpu::VertexStepMode::Instance,
+			attributes: &[
+				// Position
+				wgpu::VertexAttribute {
+					offset: 0,
+					shader_location: 2,
+					format: wgpu::VertexFormat::Float32x2,
+				},
+				// Velocity
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 2]>() as wgpu::BufferAddress,
+					shader_location: 3,
+					format: wgpu::VertexFormat::Float32x2,
+				},
+				// Angle
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 4]>() as wgpu::BufferAddress,
+					shader_location: 4,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Angvel
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 5]>() as wgpu::BufferAddress,
+					shader_location: 5,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Size
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 6]>() as wgpu::BufferAddress,
+					shader_location: 6,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Created
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 7]>() as wgpu::BufferAddress,
+					shader_location: 7,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Expires
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 8]>() as wgpu::BufferAddress,
+					shader_location: 8,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Fade
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 9]>() as wgpu::BufferAddress,
+					shader_location: 9,
+					format: wgpu::VertexFormat::Float32,
+				},
+				// Texture
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 10]>() as wgpu::BufferAddress,
+					shader_location: 10,
+					format: wgpu::VertexFormat::Uint32x2,
+				},
+				// Texture fade
+				wgpu::VertexAttribute {
+					offset: mem::size_of::<[f32; 12]>() as wgpu::BufferAddress,
+					shader_location: 11,
+					format: wgpu::VertexFormat::Float32,
+				},
+			],
+		}
+	}
+}
+
 #[repr(C)]
 #[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
 pub struct RadialBarInstance {

crates/system/src/phys/controller/autopilot/landing.rs

@@ -1,7 +1,13 @@
+use std::collections::HashMap;
+
 use galactica_util::{clockwise_angle, to_radians};
 use nalgebra::Vector2;
+use rapier2d::{dynamics::RigidBodySet, geometry::ColliderHandle};
 
-use crate::phys::{objects::ShipControls, PhysImage, PhysSimShipHandle, PhysStepResources};
+use crate::phys::{
+	objects::{PhysSimShip, ShipControls},
+	PhysStepResources,
+};
 
 // TODO: no wobble
 // TODO: slow down when near planet
@@ -10,11 +16,13 @@ use crate::phys::{objects::ShipControls, PhysImage, PhysSimShipHandle, PhysStepR
 /// Land this ship on the given object
 pub fn auto_landing(
 	_res: &PhysStepResources,
-	img: &PhysImage,
-	this_ship: PhysSimShipHandle,
+	rigid_bodies: &RigidBodySet,
+	ships: &HashMap<ColliderHandle, PhysSimShip>,
+	this_ship: ColliderHandle,
 	target_pos: Vector2<f32>,
 ) -> Option<ShipControls> {
-	let rigid_body = &img.get_ship(&this_ship).unwrap().rigidbody;
+	let rigid_body_handle = ships.get(&this_ship).unwrap().rigid_body;
+	let rigid_body = rigid_bodies.get(rigid_body_handle).unwrap();
 	let my_pos = *rigid_body.translation();
 	let my_rot = rigid_body.rotation() * Vector2::new(1.0, 0.0);
 	let my_vel = rigid_body.linvel();

crates/system/src/phys/controller/mod.rs

@@ -1,15 +1,19 @@
 //! Various implementations of [`crate::ShipBehavior`]
 
+pub(crate) mod autopilot;
 mod null;
 mod point;
 
 use null::*;
 use point::PointShipController;
 
-use std::fmt::Debug;
+use rapier2d::{dynamics::RigidBodySet, geometry::ColliderHandle};
+use std::{collections::HashMap, fmt::Debug};
 
-use super::ShipControls;
-use crate::phys::{PhysImage, PhysSimShipHandle, PhysStepResources};
+use super::{
+	objects::{PhysSimShip, ShipControls},
+	PhysStepResources,
+};
 
 /// Represents a ship controller
 #[derive(Debug, Clone)]
@@ -36,12 +40,13 @@ impl ShipController {
 	pub fn update_controls(
 		&mut self,
 		res: &PhysStepResources,
-		img: &PhysImage,
-		this_ship: PhysSimShipHandle,
+		rigid_bodies: &RigidBodySet,
+		ships: &HashMap<ColliderHandle, PhysSimShip>,
+		this_ship: ColliderHandle,
 	) -> Option<ShipControls> {
 		match self {
-			Self::Null(n) => n.update_controls(res, img, this_ship),
-			Self::Point(p) => p.update_controls(res, img, this_ship),
+			Self::Null(n) => n.update_controls(res, rigid_bodies, ships, this_ship),
+			Self::Point(p) => p.update_controls(res, rigid_bodies, ships, this_ship),
 		}
 	}
 }
@@ -56,7 +61,8 @@ where
 	fn update_controls(
 		&mut self,
 		res: &PhysStepResources,
-		img: &PhysImage,
-		this_ship: PhysSimShipHandle,
+		rigid_bodies: &RigidBodySet,
+		ships: &HashMap<ColliderHandle, PhysSimShip>,
+		this_ship: ColliderHandle,
 	) -> Option<ShipControls>;
 }

crates/system/src/phys/controller/null.rs

@@ -1,5 +1,13 @@
-use super::{ShipControllerStruct, ShipControls};
-use crate::phys::{PhysImage, PhysSimShipHandle, PhysStepResources};
+use rapier2d::{dynamics::RigidBodySet, geometry::ColliderHandle};
+use std::collections::HashMap;
+
+use super::{
+	super::{
+		objects::{PhysSimShip, ShipControls},
+		PhysStepResources,
+	},
+	ShipControllerStruct,
+};
 
 /// The Null controller is assigned to objects that are static or not controlled by the computer.
 /// Most notably, the player's ship has a Null controller.
@@ -17,8 +25,9 @@ impl ShipControllerStruct for NullShipController {
 	fn update_controls(
 		&mut self,
 		_res: &PhysStepResources,
-		_img: &PhysImage,
-		_this_ship: PhysSimShipHandle,
+		_rigid_bodies: &RigidBodySet,
+		_ships: &HashMap<ColliderHandle, PhysSimShip>,
+		_this_ship: ColliderHandle,
 	) -> Option<ShipControls> {
 		None
 	}

crates/system/src/phys/controller/point.rs

@@ -1,15 +1,19 @@
 use galactica_content::Relationship;
 use galactica_util::clockwise_angle;
 use nalgebra::Vector2;
+use rapier2d::{dynamics::RigidBodySet, geometry::ColliderHandle};
+use std::collections::HashMap;
 
-use crate::{
-	data::ShipState,
-	phys::{PhysImage, PhysSimShipHandle},
+use crate::data::ShipState;
+
+use super::{
+	super::{
+		objects::{PhysSimShip, ShipControls},
+		PhysStepResources,
+	},
+	ShipControllerStruct,
 };
 
-use super::{ShipControllerStruct, ShipControls};
-use crate::phys::PhysStepResources;
-
 /// "Point" ship controller.
 /// Point and shoot towards the nearest enemy.
 #[derive(Debug, Clone)]
@@ -26,47 +30,43 @@ impl ShipControllerStruct for PointShipController {
 	fn update_controls(
 		&mut self,
 		res: &PhysStepResources,
-		img: &PhysImage,
-		this_ship: PhysSimShipHandle,
+		rigid_bodies: &RigidBodySet,
+		ships: &HashMap<ColliderHandle, PhysSimShip>,
+		this_ship: ColliderHandle,
 	) -> Option<ShipControls> {
 		let mut controls = ShipControls::new();
 
-		let my_ship = match img.get_ship(&this_ship) {
-			None => return None,
-			Some(s) => s,
-		};
-
-		let this_rigidbody = &my_ship.rigidbody;
+		let my_ship = ships.get(&this_ship).unwrap();
+		let this_rigidbody = rigid_bodies.get(my_ship.rigid_body).unwrap();
 		let my_position = this_rigidbody.translation();
 		let my_rotation = this_rigidbody.rotation();
 		let my_angvel = this_rigidbody.angvel();
-		let my_faction = res.ct.get_faction(my_ship.ship.data.get_faction());
+		let my_faction = res.ct.get_faction(my_ship.data.get_faction());
 
 		// Iterate all possible targets
-		let mut hostile_ships = img.iter_ships().filter(
-			// Target only flying ships we're hostile towards
-			|s| match my_faction
-				.relationships
-				.get(&s.ship.data.get_faction())
-				.unwrap()
-			{
-				Relationship::Hostile => match s.ship.data.get_state() {
-					ShipState::Flying { .. } => true,
+		let mut hostile_ships = ships
+			.values()
+			.filter(
+				// Target only flying ships we're hostile towards
+				|s| match my_faction.relationships.get(&s.data.get_faction()).unwrap() {
+					Relationship::Hostile => match s.data.get_state() {
+						ShipState::Flying { .. } => true,
+						_ => false,
+					},
 					_ => false,
 				},
-				_ => false,
-			},
-		);
+			)
+			.map(|s| rigid_bodies.get(s.rigid_body).unwrap());
 
 		// Find the closest target
 		let mut closest_enemy_position = match hostile_ships.next() {
-			Some(s) => s.rigidbody.translation(),
+			Some(c) => c.translation(),
 			None => return Some(controls), // Do nothing if no targets are available
 		};
 
 		let mut d = (my_position - closest_enemy_position).magnitude();
-		for s in hostile_ships {
-			let p = s.rigidbody.translation();
+		for r in hostile_ships {
+			let p = r.translation();
 			let new_d = (my_position - p).magnitude();
 			if new_d < d {
 				d = new_d;

crates/system/src/phys/mod.rs

@@ -1,12 +1,13 @@
 //! This module provides a physics-based simulation of one system.
 
+pub mod controller;
 pub mod objects;
-pub mod physimage;
-mod physsim;
-mod physwrapper;
+mod particlebuilder;
 mod stepresources;
+mod systemsim;
+mod wrapper;
 
-pub use physimage::*;
-pub use physsim::{PhysSim, PhysSimShipHandle};
-pub use physwrapper::PhysWrapper;
+pub use particlebuilder::*;
 pub use stepresources::*;
+pub use systemsim::{PhysSim, PhysSimShipHandle};
+pub use wrapper::Wrapper;

crates/system/src/phys/objects/collapse.rs

@@ -1,15 +1,10 @@
 use galactica_content::{CollapseEvent, Content, Ship};
 use nalgebra::{Point2, Vector2};
 use rand::{rngs::ThreadRng, Rng};
-use rapier2d::{
-	dynamics::RigidBodyHandle,
-	geometry::{Collider, ColliderHandle},
-};
+use rapier2d::{dynamics::RigidBody, geometry::Collider};
 
-use crate::{
-	data::ShipData,
-	phys::{objects::PhysEffect, physsim::NewObjects, PhysStepResources, PhysWrapper},
-};
+use super::super::{ParticleBuilder, PhysStepResources};
+use crate::data::ShipData;
 
 #[derive(Debug, Clone)]
 pub(super) struct ShipCollapseSequence {
@@ -54,14 +49,10 @@ impl ShipCollapseSequence {
 	pub(super) fn step(
 		&mut self,
 		res: &mut PhysStepResources,
-		wrapper: &mut PhysWrapper,
-		new: &mut NewObjects,
 		ship_data: &ShipData,
-		rigid_body_handle: RigidBodyHandle,
-		collider_handle: ColliderHandle,
+		rigid_body: &mut RigidBody,
+		collider: &mut Collider,
 	) {
-		let rigid_body = wrapper.get_rigid_body(rigid_body_handle).unwrap().clone();
-		let collider = wrapper.get_collider(collider_handle).unwrap().clone();
 		let ship_content = res.ct.get_ship(ship_data.get_content());
 		let ship_pos = rigid_body.translation();
 		let ship_rot = rigid_body.rotation();
@@ -80,26 +71,26 @@ impl ShipCollapseSequence {
 					// ^^ Don't miss events scheduled at the very start of the sequence!
 					{
 						for spawner in &event.effects {
+							let effect = res.ct.get_effect(spawner.effect);
+
 							for _ in 0..spawner.count as usize {
 								let pos: Vector2<f32> = if let Some(pos) = spawner.pos {
 									Vector2::new(pos.x, pos.y)
 								} else {
-									self.random_in_ship(res.ct, ship_content, &collider)
+									self.random_in_ship(res.ct, ship_content, collider)
 								};
 								let pos = ship_pos + (ship_rot * pos);
 
 								let velocity =
 									rigid_body.velocity_at_point(&Point2::new(pos.x, pos.y));
 
-								new.effects.push(PhysEffect::new(
-									res.ct,
-									wrapper,
-									spawner.effect,
-									pos,
+								res.particles.push(ParticleBuilder::from_content(
+									effect,
+									pos.into(),
 									0.0,
 									velocity,
 									Vector2::new(0.0, 0.0),
-								));
+								))
 							}
 						}
 					}
@@ -109,6 +100,8 @@ impl ShipCollapseSequence {
 
 		// Create collapse effects
 		for spawner in &ship_content.collapse.effects {
+			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.
 			let pdf = |x: f32| {
@@ -128,22 +121,23 @@ impl ShipCollapseSequence {
 				let pos = if let Some(pos) = spawner.pos {
 					Vector2::new(pos.x, pos.y)
 				} else {
-					self.random_in_ship(res.ct, ship_content, &collider)
+					self.random_in_ship(res.ct, ship_content, collider)
 				};
 
 				// Position, adjusted for ship rotation
 				let pos = ship_pos + (ship_rot * pos);
 				let vel = rigid_body.velocity_at_point(&Point2::new(pos.x, pos.y));
 
-				new.effects.push(PhysEffect::new(
-					res.ct,
-					wrapper,
-					spawner.effect,
-					pos,
-					0.0,
-					vel,
-					Vector2::new(0.0, 0.0),
-				));
+				res.particles.push(ParticleBuilder {
+					sprite: effect.sprite,
+					pos: pos.into(),
+					velocity: vel,
+					angle: 0.0,
+					angvel: 0.0,
+					lifetime: effect.lifetime,
+					size: effect.size,
+					fade: 0.0,
+				});
 			}
 		}
 

crates/system/src/phys/objects/mod.rs

@@ -1,9 +1,7 @@
 //! This module contains game objects that may interact with the physics engine.
-
-mod effect;
+mod collapse;
 mod projectile;
 mod ship;
 
-pub use effect::*;
 pub use projectile::PhysProjectile;
-pub use ship::*;
+pub use ship::{PhysSimShip, ShipControls};

crates/system/src/phys/objects/projectile.rs

@@ -1,12 +1,7 @@
 use galactica_content::{AnimationState, Content, FactionHandle, Projectile, SpriteAutomaton};
-use nalgebra::Vector2;
 use rand::Rng;
 use rapier2d::{dynamics::RigidBodyHandle, geometry::ColliderHandle};
 
-use crate::phys::{physsim::NewObjects, PhysStepResources, PhysWrapper};
-
-use super::PhysEffect;
-
 /// A single projectile in this simulation
 #[derive(Debug, Clone)]
 pub struct PhysProjectile {
@@ -17,7 +12,7 @@ pub struct PhysProjectile {
 	anim: SpriteAutomaton,
 
 	/// The remaining lifetime of this projectile, in seconds
-	lifetime: f32,
+	pub lifetime: f32,
 
 	/// The faction this projectile belongs to
 	pub faction: FactionHandle,
@@ -30,10 +25,6 @@ pub struct PhysProjectile {
 
 	/// This projectile's size variation
 	pub size_rng: f32,
-
-	/// If true, this projectile has been destroyed
-	/// and is waiting to be deallocated.
-	is_destroyed: bool,
 }
 
 impl PhysProjectile {
@@ -56,88 +47,18 @@ impl PhysProjectile {
 			lifetime,
 			faction,
 			size_rng: rng.gen_range(-size_rng..=size_rng),
-			is_destroyed: false,
 		}
 	}
 
 	/// Process this projectile's state after `t` seconds
-	pub(in crate::phys) fn step(
-		&mut self,
-		res: &PhysStepResources,
-		new: &mut NewObjects,
-		wrapper: &mut PhysWrapper,
-	) {
-		self.lifetime -= res.t;
-		self.anim.step(res.ct, res.t);
-
-		if self.lifetime <= 0.0 {
-			self.destroy(res, new, wrapper, true);
-		}
+	pub fn tick(&mut self, ct: &Content, t: f32) {
+		self.lifetime -= t;
+		self.anim.step(ct, t)
 	}
 
-	/// Destroy this projectile without creating an expire effect
-	pub(in crate::phys) fn destroy_silent(
-		&mut self,
-		res: &PhysStepResources,
-		new: &mut NewObjects,
-		wrapper: &mut PhysWrapper,
-	) {
-		self.destroy(res, new, wrapper, false);
-	}
-
-	/// Destroy this projectile
-	fn destroy(
-		&mut self,
-		res: &PhysStepResources,
-		new: &mut NewObjects,
-		wrapper: &mut PhysWrapper,
-		expire: bool,
-	) {
-		if self.is_destroyed {
-			return;
-		}
-
-		let rigid_body = wrapper.remove_rigid_body(self.rigid_body).unwrap();
-		let mut rng = rand::thread_rng();
-
-		if expire {
-			match &self.content.expire_effect {
-				None => {}
-				Some(handle) => {
-					let x = res.ct.get_effect(*handle);
-					let pos = *rigid_body.translation();
-					let vel = rigid_body.velocity_at_point(rigid_body.center_of_mass());
-					let angle = rigid_body.rotation().angle();
-
-					let velocity = {
-						let a = rng
-							.gen_range(-x.velocity_scale_parent_rng..=x.velocity_scale_parent_rng);
-
-						let velocity = (x.velocity_scale_parent + a) * vel;
-
-						velocity
-					};
-
-					new.effects.push(PhysEffect::new(
-						res.ct,
-						wrapper,
-						*handle,
-						pos,
-						angle,
-						velocity,
-						Vector2::new(0.0, 0.0),
-					));
-				}
-			}
-		};
-
-		self.is_destroyed = true;
-		wrapper.remove_rigid_body(self.rigid_body);
-	}
-
-	/// Should this effect be deleted?
-	pub(in crate::phys) fn should_remove(&self) -> bool {
-		self.is_destroyed
+	/// Has this projectile expired?
+	pub fn is_expired(&self) -> bool {
+		return self.lifetime < 0.0;
 	}
 }
 

crates/system/src/phys/objects/ship.rs

@@ -0,0 +1,316 @@
+use galactica_content::{
+	AnimationState, Content, EnginePoint, FactionHandle, OutfitHandle, ShipHandle, SpriteAutomaton,
+};
+use nalgebra::{point, vector, Rotation2, Vector2};
+use rand::Rng;
+use rapier2d::{
+	dynamics::{RigidBody, RigidBodyHandle},
+	geometry::{Collider, ColliderHandle},
+};
+
+use crate::data::{ShipData, ShipPersonality, ShipState};
+
+use super::{
+	super::{ParticleBuilder, PhysStepResources},
+	collapse::ShipCollapseSequence,
+};
+
+/// 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,
+}
+
+impl ShipControls {
+	/// Create a new, empty ShipControls
+	pub fn new() -> Self {
+		ShipControls {
+			left: false,
+			right: false,
+			thrust: false,
+			guns: false,
+		}
+	}
+}
+
+/// A ship instance in the physics system
+#[derive(Debug, Clone)]
+pub struct PhysSimShip {
+	/// This ship's physics handle
+	pub rigid_body: RigidBodyHandle,
+
+	/// This ship's collider
+	pub collider: ColliderHandle,
+
+	/// This ship's game data
+	pub(crate) data: ShipData,
+
+	/// This ship's sprite animation state
+	anim: SpriteAutomaton,
+
+	/// Animation state for each of this ship's engines
+	engine_anim: Vec<(EnginePoint, SpriteAutomaton)>,
+
+	/// This ship's controls
+	pub(crate) controls: ShipControls,
+
+	/// This ship's controls during the last frame
+	last_controls: ShipControls,
+
+	/// This ship's collapse sequence
+	collapse_sequence: Option<ShipCollapseSequence>,
+}
+
+impl PhysSimShip {
+	/// Make a new ship
+	pub(crate) fn new(
+		ct: &Content,
+		handle: ShipHandle,
+		personality: ShipPersonality,
+		faction: FactionHandle,
+		rigid_body: RigidBodyHandle,
+		collider: ColliderHandle,
+	) -> Self {
+		let ship_ct = ct.get_ship(handle);
+		PhysSimShip {
+			anim: SpriteAutomaton::new(ct, ship_ct.sprite),
+			rigid_body,
+			collider,
+			data: ShipData::new(ct, handle, faction, personality),
+			engine_anim: Vec::new(),
+			controls: ShipControls::new(),
+			last_controls: ShipControls::new(),
+			collapse_sequence: Some(ShipCollapseSequence::new(ship_ct.collapse.length)),
+		}
+	}
+
+	/// Step this ship's state by t seconds
+	pub fn step(
+		&mut self,
+		res: &mut PhysStepResources,
+		rigid_body: &mut RigidBody,
+		collider: &mut Collider,
+	) {
+		self.data.step(res.t);
+		self.anim.step(res.ct, res.t);
+
+		for (_, e) in &mut self.engine_anim {
+			e.step(res.ct, res.t);
+		}
+
+		if !self.controls.thrust && self.last_controls.thrust {
+			let flare = self.get_flare(res.ct);
+			if flare.is_some() {
+				let flare_outfit = flare.unwrap();
+				let flare = res.ct.get_outfit(flare_outfit);
+				if flare.engine_flare_on_stop.is_some() {
+					for (_, e) in &mut self.engine_anim {
+						e.jump_to(res.ct, flare.engine_flare_on_stop.unwrap());
+					}
+				}
+			};
+		} else if self.controls.thrust && !self.last_controls.thrust {
+			let flare = self.get_flare(res.ct);
+			if flare.is_some() {
+				let flare_outfit = flare.unwrap();
+				let flare = res.ct.get_outfit(flare_outfit);
+				if flare.engine_flare_on_start.is_some() {
+					for (_, e) in &mut self.engine_anim {
+						e.jump_to(res.ct, flare.engine_flare_on_start.unwrap());
+					}
+				}
+			};
+		}
+
+		match self.data.get_state() {
+			ShipState::Collapsing { .. } => {
+				// Borrow checker hack, so we may pass self.data
+				// to the collapse sequence
+				let mut seq = self.collapse_sequence.take().unwrap();
+				seq.step(res, &self.data, rigid_body, collider);
+				self.collapse_sequence = Some(seq);
+
+				if self.collapse_sequence.as_ref().unwrap().is_done() {
+					self.data.finish_collapse();
+				}
+			}
+			ShipState::Flying { .. } => {
+				self.step_physics(res, rigid_body, collider);
+				self.step_effects(res, rigid_body, collider);
+			}
+
+			ShipState::UnLanding { .. } | ShipState::Landing { .. } => {
+				self.step_physics(res, rigid_body, collider);
+			}
+
+			ShipState::Dead | ShipState::Landed { .. } => {}
+		}
+
+		self.last_controls = self.controls.clone();
+	}
+
+	/// Update this frame's physics
+	fn step_physics(
+		&mut self,
+		res: &mut PhysStepResources,
+		rigid_body: &mut RigidBody,
+		_collider: &mut Collider,
+	) {
+		let ship_rot = rigid_body.rotation();
+		let engine_force = ship_rot * (Vector2::new(1.0, 0.0) * res.t);
+
+		if self.controls.thrust {
+			rigid_body.apply_impulse(
+				vector![engine_force.x, engine_force.y]
+					* self.data.get_outfits().get_engine_thrust(),
+				true,
+			);
+		}
+
+		if self.controls.right {
+			rigid_body.apply_torque_impulse(
+				self.data.get_outfits().get_steer_power() * -100.0 * res.t,
+				true,
+			);
+		}
+
+		if self.controls.left {
+			rigid_body.apply_torque_impulse(
+				self.data.get_outfits().get_steer_power() * 100.0 * res.t,
+				true,
+			);
+		}
+	}
+
+	/// Spawn this frame's particles
+	fn step_effects(
+		&mut self,
+		res: &mut PhysStepResources,
+		rigid_body: &mut RigidBody,
+		collider: &mut Collider,
+	) {
+		let ship_content = res.ct.get_ship(self.data.get_content());
+		let ship_pos = rigid_body.translation();
+		let ship_rot = rigid_body.rotation();
+		let ship_ang = ship_rot.angle();
+		let mut rng = rand::thread_rng();
+
+		if self.data.get_hull() <= ship_content.damage.hull {
+			for e in &ship_content.damage.effects {
+				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 {
+						Vector2::new(pos.x, pos.y)
+					} else {
+						// Pick a random point inside this ship's collider
+						let mut y = 0.0;
+						let mut x = 0.0;
+						let mut a = false;
+						while !a {
+							x = rng.gen_range(-1.0..=1.0) * ship_content.size / 2.0;
+							y = rng.gen_range(-1.0..=1.0)
+								* ship_content.size * res.ct.get_sprite(ship_content.sprite).aspect
+								/ 2.0;
+							a = collider.shape().contains_local_point(&point![x, y]);
+						}
+						Vector2::new(x, y)
+					};
+
+					let pos = ship_pos + (Rotation2::new(ship_ang) * pos);
+					let velocity = rigid_body.velocity_at_point(&point![pos.x, pos.y]);
+
+					res.particles.push(ParticleBuilder::from_content(
+						effect,
+						pos.into(),
+						0.0,
+						velocity,
+						Vector2::new(0.0, 0.0),
+					))
+				}
+			}
+		}
+	}
+}
+
+/// Public mutable
+impl PhysSimShip {
+	fn get_flare(&mut self, ct: &Content) -> Option<OutfitHandle> {
+		// TODO: better way to pick flare sprite
+		for (h, _) in self.data.get_outfits().iter_outfits() {
+			let c = ct.get_outfit(*h);
+			if c.engine_flare_sprite.is_some() {
+				return Some(*h);
+			}
+		}
+		return None;
+	}
+
+	/// Re-create this ship's engine flare animations
+	/// Should be called whenever we change outfits
+	fn update_flares(&mut self, ct: &Content) {
+		let flare_outfit = self.get_flare(ct);
+		if flare_outfit.is_none() {
+			self.engine_anim = Vec::new();
+			return;
+		}
+		let flare = ct
+			.get_outfit(flare_outfit.unwrap())
+			.engine_flare_sprite
+			.unwrap();
+
+		self.engine_anim = ct
+			.get_ship(self.data.get_content())
+			.engines
+			.iter()
+			.map(|e| (e.clone(), SpriteAutomaton::new(ct, flare)))
+			.collect();
+	}
+
+	/// Add one outfit to this ship
+	pub fn add_outfit(&mut self, ct: &Content, o: OutfitHandle) {
+		self.data.add_outfit(ct.get_outfit(o));
+		self.update_flares(ct);
+	}
+
+	/// Add many outfits to this ship
+	pub fn add_outfits(&mut self, ct: &Content, outfits: impl IntoIterator<Item = OutfitHandle>) {
+		for o in outfits {
+			self.data.add_outfit(ct.get_outfit(o));
+		}
+		self.update_flares(ct);
+	}
+}
+
+/// Public immutable
+impl PhysSimShip {
+	/// Get this ship's control state
+	pub fn get_controls(&self) -> &ShipControls {
+		&self.controls
+	}
+
+	/// Get this ship's engine animations
+	pub fn iter_engine_anim(&self) -> impl Iterator<Item = &(EnginePoint, SpriteAutomaton)> {
+		self.engine_anim.iter()
+	}
+
+	/// Get this ship's animation state
+	pub fn get_anim_state(&self) -> AnimationState {
+		self.anim.get_texture_idx()
+	}
+
+	/// Get this ship's game data struct
+	pub fn get_data(&self) -> &ShipData {
+		&self.data
+	}
+}

crates/system/src/phys/objects/ship/controls.rs

@@ -1,27 +0,0 @@
-/// 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,
-}
-
-impl ShipControls {
-	/// Create a new, empty ShipControls
-	pub fn new() -> Self {
-		ShipControls {
-			left: false,
-			right: false,
-			thrust: false,
-			guns: false,
-		}
-	}
-}

crates/system/src/phys/objects/ship/mod.rs

@@ -1,8 +0,0 @@
-mod autopilot;
-mod collapse;
-mod controller;
-mod controls;
-mod ship;
-
-pub use controls::ShipControls;
-pub use ship::PhysShip;

crates/system/src/phys/objects/ship/ship.rs

@@ -1,543 +0,0 @@
-use galactica_content::{
-	AnimationState, Content, EnginePoint, FactionHandle, GunPoint, OutfitHandle,
-	ProjectileCollider, ShipHandle, SpriteAutomaton,
-};
-use nalgebra::{vector, Point2, Rotation2, Vector2};
-use rand::Rng;
-use rapier2d::{
-	dynamics::{RigidBodyBuilder, RigidBodyHandle},
-	geometry::{ColliderBuilder, ColliderHandle, Group, InteractionGroups},
-	pipeline::ActiveEvents,
-};
-
-use super::{autopilot, collapse::ShipCollapseSequence, controller::ShipController, ShipControls};
-use crate::{
-	data::{ShipAutoPilot, ShipData, ShipPersonality, ShipState},
-	phys::{
-		objects::{PhysEffect, PhysProjectile},
-		physsim::NewObjects,
-		PhysImage, PhysSimShipHandle, PhysStepResources, PhysWrapper,
-	},
-};
-
-/// A ship instance in the physics system
-#[derive(Debug, Clone)]
-pub struct PhysShip {
-	/// This ship's physics handle
-	pub rigid_body: RigidBodyHandle,
-
-	/// This ship's collider
-	pub collider: ColliderHandle,
-
-	/// This ship's game data
-	pub(crate) data: ShipData,
-
-	/// This ship's sprite animation state
-	anim: SpriteAutomaton,
-
-	/// Animation state for each of this ship's engines
-	engine_anim: Vec<(EnginePoint, SpriteAutomaton)>,
-
-	/// This ship's controls
-	pub(crate) controls: ShipControls,
-
-	/// This ship's controls during the last frame
-	last_controls: ShipControls,
-
-	/// This ship's collapse sequence
-	collapse_sequence: Option<ShipCollapseSequence>,
-
-	/// This ship's controller
-	controller: ShipController,
-
-	/// If true, this ship's collider has been destroyed,
-	/// and this ship is waiting to be destroyed.
-	///
-	/// Note that this is NOT "in-game" destroyed,
-	/// but rather "internal game logic" destroyed.
-	/// In-game destroyed corresponds to the "Dead" state.
-	is_destroyed: bool,
-}
-
-impl PhysShip {
-	/// Make a new ship
-	pub(crate) fn new(
-		ct: &Content,
-		handle: ShipHandle,
-		personality: ShipPersonality,
-		faction: FactionHandle,
-		rigid_body: RigidBodyHandle,
-		collider: ColliderHandle,
-	) -> Self {
-		let ship_ct = ct.get_ship(handle);
-		PhysShip {
-			anim: SpriteAutomaton::new(ct, ship_ct.sprite),
-			rigid_body,
-			collider,
-			data: ShipData::new(ct, handle, faction, personality),
-			engine_anim: Vec::new(),
-			controls: ShipControls::new(),
-			last_controls: ShipControls::new(),
-			collapse_sequence: Some(ShipCollapseSequence::new(ship_ct.collapse.length)),
-			is_destroyed: false,
-			controller: match personality {
-				ShipPersonality::Dummy | ShipPersonality::Player => ShipController::new_null(),
-				ShipPersonality::Point => ShipController::new_point(),
-			},
-		}
-	}
-
-	/// Step this ship's state by t seconds
-	pub(in crate::phys) fn step(
-		&mut self,
-		res: &mut PhysStepResources,
-		img: &PhysImage,
-		wrapper: &mut PhysWrapper,
-		new: &mut NewObjects,
-	) {
-		if self.is_destroyed {
-			return;
-		}
-
-		self.data.step(res.t);
-		self.anim.step(res.ct, res.t);
-
-		for (_, e) in &mut self.engine_anim {
-			e.step(res.ct, res.t);
-		}
-
-		// Flare animations
-		if !self.controls.thrust && self.last_controls.thrust {
-			let flare = self.get_flare(res.ct);
-			if flare.is_some() {
-				let flare_outfit = flare.unwrap();
-				let flare = res.ct.get_outfit(flare_outfit);
-				if flare.engine_flare_on_stop.is_some() {
-					for (_, e) in &mut self.engine_anim {
-						e.jump_to(res.ct, flare.engine_flare_on_stop.unwrap());
-					}
-				}
-			};
-		} else if self.controls.thrust && !self.last_controls.thrust {
-			let flare = self.get_flare(res.ct);
-			if flare.is_some() {
-				let flare_outfit = flare.unwrap();
-				let flare = res.ct.get_outfit(flare_outfit);
-				if flare.engine_flare_on_start.is_some() {
-					for (_, e) in &mut self.engine_anim {
-						e.jump_to(res.ct, flare.engine_flare_on_start.unwrap());
-					}
-				}
-			};
-		}
-
-		match self.data.get_state() {
-			ShipState::Collapsing { .. } => {
-				// Borrow checker hack, so we may pass self.data
-				// to the collapse sequence
-				let mut seq = self.collapse_sequence.take().unwrap();
-				seq.step(
-					res,
-					wrapper,
-					new,
-					&self.data,
-					self.rigid_body,
-					self.collider,
-				);
-				self.collapse_sequence = Some(seq);
-
-				if self.collapse_sequence.as_ref().unwrap().is_done() {
-					self.data.finish_collapse();
-				}
-			}
-			ShipState::Flying { autopilot } => {
-				// Compute new controls
-				let controls = match autopilot {
-					ShipAutoPilot::Landing { target } => {
-						let target_obj = res.ct.get_system_object(*target);
-						let controls = autopilot::auto_landing(
-							res,
-							img,
-							PhysSimShipHandle(self.collider),
-							Vector2::new(target_obj.pos.x, target_obj.pos.y),
-						);
-
-						// Try to land the ship.
-						// True if success, false if failure.
-						// Failure implies no state changes.
-						let landed = 'landed: {
-							let r = wrapper.get_rigid_body(self.rigid_body).unwrap();
-
-							let t_pos = Vector2::new(target_obj.pos.x, target_obj.pos.y);
-							let s_pos = Vector2::new(
-								r.position().translation.x,
-								r.position().translation.y,
-							);
-
-							// TODO: deactivate collider when landing.
-							// Can't just set_active(false), since we still need that collider's mass.
-
-							// We're in land range...
-							if (t_pos - s_pos).magnitude() > target_obj.size / 2.0 {
-								break 'landed false;
-							}
-
-							// And we'll stay in land range long enough.
-							if (t_pos - (s_pos + r.velocity_at_point(r.center_of_mass()) * 2.0))
-								.magnitude() > target_obj.size / 2.0
-							{
-								break 'landed false;
-							}
-
-							let collider = wrapper.get_collider_mut(self.collider).unwrap();
-							collider.set_collision_groups(InteractionGroups::new(
-								Group::GROUP_1,
-								Group::empty(),
-							));
-							self.data.start_land_on(*target);
-							break 'landed true;
-						};
-
-						if landed {
-							None
-						} else {
-							controls
-						}
-					}
-					ShipAutoPilot::None => {
-						self.controller
-							.update_controls(res, img, PhysSimShipHandle(self.collider))
-					}
-				};
-
-				if let Some(controls) = controls {
-					self.controls = controls;
-				}
-
-				self.step_physics(res, wrapper);
-				self.step_effects(res, wrapper, new);
-
-				// If we're firing, try to fire each gun
-				if self.controls.guns {
-					// TODO: don't allocate here. This is a hack to satisfy the borrow checker,
-					// convert this to a refcell or do the replace dance.
-					let pairs: Vec<(GunPoint, Option<OutfitHandle>)> = self
-						.data
-						.get_outfits()
-						.iter_gun_points()
-						.map(|(p, o)| (p.clone(), o.clone()))
-						.collect();
-
-					for (gun_point, outfit) in pairs {
-						if self.data.fire_gun(res.ct, &gun_point) {
-							let outfit = outfit.unwrap();
-
-							let mut rng = rand::thread_rng();
-
-							let rigid_body = wrapper.get_rigid_body(self.rigid_body).unwrap();
-							let ship_pos = rigid_body.translation();
-							let ship_rot = rigid_body.rotation();
-							let ship_ang = ship_rot.angle();
-							let ship_vel =
-								rigid_body.velocity_at_point(rigid_body.center_of_mass());
-
-							let pos = ship_pos + (ship_rot * gun_point.pos);
-
-							let outfit = res.ct.get_outfit(outfit);
-							let outfit = outfit.gun.as_ref().unwrap();
-
-							let spread = rng.gen_range(
-								-outfit.projectile.angle_rng..=outfit.projectile.angle_rng,
-							);
-							let vel = ship_vel
-								+ (Rotation2::new(ship_ang + spread)
-									* Vector2::new(
-										outfit.projectile.speed
-											+ rng.gen_range(
-												-outfit.projectile.speed_rng
-													..=outfit.projectile.speed_rng,
-											),
-										0.0,
-									));
-
-							let rigid_body = RigidBodyBuilder::kinematic_velocity_based()
-								.translation(pos)
-								.rotation(ship_ang)
-								.linvel(vel)
-								.build();
-
-							let mut collider = match &outfit.projectile.collider {
-								ProjectileCollider::Ball(b) => ColliderBuilder::ball(b.radius)
-									.sensor(true)
-									.active_events(ActiveEvents::COLLISION_EVENTS)
-									.build(),
-							};
-
-							collider.set_collision_groups(InteractionGroups::new(
-								Group::GROUP_2,
-								Group::GROUP_1,
-							));
-
-							let rigid_body = wrapper.insert_rigid_body(rigid_body);
-							let collider = wrapper.insert_collider(collider, rigid_body);
-
-							new.projectiles.push(PhysProjectile::new(
-								res.ct,
-								outfit.projectile.clone(),
-								rigid_body,
-								self.data.get_faction(),
-								collider,
-							));
-						}
-					}
-				}
-			}
-
-			ShipState::UnLanding {
-				to_position,
-				current_z,
-				from,
-			} => {
-				let from_obj = res.ct.get_system_object(*from);
-
-				let controls = autopilot::auto_landing(
-					&res,
-					img,
-					PhysSimShipHandle(self.collider),
-					Vector2::new(to_position.translation.x, to_position.translation.y),
-				);
-				let r = wrapper.get_rigid_body_mut(self.rigid_body).unwrap();
-				let max_d = (Vector2::new(from_obj.pos.x, from_obj.pos.y)
-					- Vector2::new(to_position.translation.x, to_position.translation.y))
-				.magnitude();
-				let now_d = (r.translation()
-					- Vector2::new(to_position.translation.x, to_position.translation.y))
-				.magnitude();
-				let f = now_d / max_d;
-
-				let current_z = *current_z;
-				let zdist = 1.0 - from_obj.pos.z;
-
-				if current_z <= 1.0 {
-					// Finish unlanding ship
-					self.data.finish_unland_to();
-					wrapper
-						.get_collider_mut(self.collider)
-						.unwrap()
-						.set_collision_groups(InteractionGroups::new(
-							Group::GROUP_1,
-							Group::GROUP_1 | Group::GROUP_2,
-						));
-				} else if current_z <= 1.5 {
-					self.data
-						.set_unlanding_z(1f32.max(current_z - (0.5 * res.t) / 0.5));
-					self.controls = ShipControls::new();
-				} else {
-					self.data.set_unlanding_z(1.0 - zdist * f);
-
-					if let Some(controls) = controls {
-						self.controls = controls;
-					}
-					self.step_physics(res, wrapper);
-				};
-			}
-
-			ShipState::Landing { target, current_z } => {
-				let target_obj = res.ct.get_system_object(*target);
-				let controls = autopilot::auto_landing(
-					&res,
-					img,
-					PhysSimShipHandle(self.collider),
-					Vector2::new(target_obj.pos.x, target_obj.pos.y),
-				);
-
-				let current_z = *current_z;
-				let zdist = target_obj.pos.z - 1.0;
-
-				if current_z >= target_obj.pos.z {
-					// Finish landing ship
-					self.data.finish_land_on();
-					let r = wrapper.get_rigid_body_mut(self.rigid_body).unwrap();
-					r.set_enabled(false);
-					r.set_angvel(0.0, false);
-					r.set_linvel(nalgebra::Vector2::new(0.0, 0.0), false);
-				} else {
-					self.data.set_landing_z(current_z + zdist * res.t / 2.0);
-
-					if let Some(controls) = controls {
-						self.controls = controls;
-					}
-					self.step_physics(res, wrapper);
-				};
-			}
-
-			ShipState::Landed { .. } => {}
-
-			ShipState::Dead => {
-				wrapper.remove_rigid_body(self.rigid_body);
-				self.is_destroyed = true;
-			}
-		};
-
-		self.last_controls = self.controls.clone();
-	}
-
-	/// Should this ship's data be removed?
-	pub fn should_remove(&self) -> bool {
-		self.is_destroyed
-	}
-
-	/// Update this frame's physics
-	fn step_physics(&mut self, res: &mut PhysStepResources, wrapper: &mut PhysWrapper) {
-		let rigid_body = &mut wrapper.get_rigid_body_mut(self.rigid_body).unwrap();
-		let ship_rot = rigid_body.rotation();
-		let engine_force = ship_rot * (Vector2::new(1.0, 0.0) * res.t);
-
-		if self.controls.thrust {
-			rigid_body.apply_impulse(
-				vector![engine_force.x, engine_force.y]
-					* self.data.get_outfits().get_engine_thrust(),
-				true,
-			);
-		}
-
-		if self.controls.right {
-			rigid_body.apply_torque_impulse(
-				self.data.get_outfits().get_steer_power() * -100.0 * res.t,
-				true,
-			);
-		}
-
-		if self.controls.left {
-			rigid_body.apply_torque_impulse(
-				self.data.get_outfits().get_steer_power() * 100.0 * res.t,
-				true,
-			);
-		}
-	}
-
-	/// Spawn this frame's particles
-	fn step_effects(
-		&mut self,
-		res: &mut PhysStepResources,
-		wrapper: &mut PhysWrapper,
-		new: &mut NewObjects,
-	) {
-		let rigid_body = wrapper.get_rigid_body(self.rigid_body).unwrap().clone();
-		let collider = wrapper.get_collider(self.collider).unwrap().clone();
-
-		let ship_content = res.ct.get_ship(self.data.get_content());
-		let ship_pos = rigid_body.translation();
-		let ship_rot = rigid_body.rotation();
-		let ship_ang = ship_rot.angle();
-		let mut rng = rand::thread_rng();
-
-		if self.data.get_hull() <= ship_content.damage.hull {
-			for e in &ship_content.damage.effects {
-				if rng.gen_range(0.0..=1.0) <= res.t / e.frequency {
-					let pos = if let Some(pos) = e.pos {
-						Vector2::new(pos.x, pos.y)
-					} else {
-						// Pick a random point inside this ship's collider
-						let mut y = 0.0;
-						let mut x = 0.0;
-						let mut a = false;
-						while !a {
-							x = rng.gen_range(-1.0..=1.0) * ship_content.size / 2.0;
-							y = rng.gen_range(-1.0..=1.0)
-								* ship_content.size * res.ct.get_sprite(ship_content.sprite).aspect
-								/ 2.0;
-							a = collider.shape().contains_local_point(&Point2::new(x, y));
-						}
-						Vector2::new(x, y)
-					};
-
-					let pos = ship_pos + (Rotation2::new(ship_ang) * pos);
-					let velocity = rigid_body.velocity_at_point(&Point2::new(pos.x, pos.y));
-
-					new.effects.push(PhysEffect::new(
-						res.ct,
-						wrapper,
-						e.effect,
-						pos.into(),
-						0.0,
-						velocity,
-						Vector2::new(0.0, 0.0),
-					));
-				}
-			}
-		}
-	}
-}
-
-/// Public mutable
-impl PhysShip {
-	fn get_flare(&mut self, ct: &Content) -> Option<OutfitHandle> {
-		// TODO: better way to pick flare sprite
-		for (h, _) in self.data.get_outfits().iter_outfits() {
-			let c = ct.get_outfit(*h);
-			if c.engine_flare_sprite.is_some() {
-				return Some(*h);
-			}
-		}
-		return None;
-	}
-
-	/// Re-create this ship's engine flare animations
-	/// Should be called whenever we change outfits
-	fn update_flares(&mut self, ct: &Content) {
-		let flare_outfit = self.get_flare(ct);
-		if flare_outfit.is_none() {
-			self.engine_anim = Vec::new();
-			return;
-		}
-		let flare = ct
-			.get_outfit(flare_outfit.unwrap())
-			.engine_flare_sprite
-			.unwrap();
-
-		self.engine_anim = ct
-			.get_ship(self.data.get_content())
-			.engines
-			.iter()
-			.map(|e| (e.clone(), SpriteAutomaton::new(ct, flare)))
-			.collect();
-	}
-
-	/// Add one outfit to this ship
-	pub fn add_outfit(&mut self, ct: &Content, o: OutfitHandle) {
-		self.data.add_outfit(ct.get_outfit(o));
-		self.update_flares(ct);
-	}
-
-	/// Add many outfits to this ship
-	pub fn add_outfits(&mut self, ct: &Content, outfits: impl IntoIterator<Item = OutfitHandle>) {
-		for o in outfits {
-			self.data.add_outfit(ct.get_outfit(o));
-		}
-		self.update_flares(ct);
-	}
-}
-
-/// Public immutable
-impl PhysShip {
-	/// Get this ship's control state
-	pub fn get_controls(&self) -> &ShipControls {
-		&self.controls
-	}
-
-	/// Get this ship's engine animations
-	pub fn iter_engine_anim(&self) -> impl Iterator<Item = &(EnginePoint, SpriteAutomaton)> {
-		self.engine_anim.iter()
-	}
-
-	/// Get this ship's animation state
-	pub fn get_anim_state(&self) -> AnimationState {
-		self.anim.get_texture_idx()
-	}
-
-	/// Get this ship's game data struct
-	pub fn get_data(&self) -> &ShipData {
-		&self.data
-	}
-}

crates/system/src/phys/particlebuilder.rs

@@ -1,46 +1,45 @@
-use galactica_content::{Content, EffectHandle, SpriteAutomaton};
-use nalgebra::{Rotation2, Vector2};
+use galactica_content::{Effect, SpriteHandle};
+use nalgebra::{Point2, Rotation2, Vector2};
 use rand::Rng;
-use rapier2d::dynamics::{RigidBodyBuilder, RigidBodyHandle, RigidBodyType};
-
-use crate::phys::{PhysStepResources, PhysWrapper};
 
 /// Instructions to create a new particle
-#[derive(Debug, Clone)]
-pub struct PhysEffect {
+#[derive(Debug)]
+pub struct ParticleBuilder {
 	/// The sprite to use for this particle
-	pub anim: SpriteAutomaton,
+	pub sprite: SpriteHandle,
+
+	/// This object's center, in world coordinates.
+	pub pos: Point2<f32>,
 
 	/// This particle's velocity, in world coordinates
-	pub rigid_body: RigidBodyHandle,
+	pub velocity: Vector2<f32>,
+
+	/// This particle's angle, in radians
+	pub angle: f32,
+
+	/// This particle's angular velocity (rad/sec)
+	pub angvel: f32,
 
 	/// This particle's lifetime, in seconds
-	lifetime: f32,
+	pub lifetime: f32,
 
 	/// The size of this particle,
 	/// given as height in world units.
 	pub size: f32,
 
-	/// Fade this particle over this many seconds as it expires
+	/// Fade this particle out over this many seconds as it expires
 	pub fade: f32,
-
-	/// If true, this effect has been destroyed,
-	/// and needs to be removed from the game.
-	is_destroyed: bool,
 }
 
-impl PhysEffect {
-	/// Create a new particle inside `Wrapper`
-	pub fn new(
-		ct: &Content,
-		wrapper: &mut PhysWrapper,
-		effect: EffectHandle,
-		pos: Vector2<f32>,
+impl ParticleBuilder {
+	/// Create a ParticleBuilder from an Effect
+	pub fn from_content(
+		effect: &Effect,
+		pos: Point2<f32>,
 		parent_angle: f32,
 		parent_velocity: Vector2<f32>,
 		target_velocity: Vector2<f32>,
 	) -> Self {
-		let effect = ct.get_effect(effect);
 		let mut rng = rand::thread_rng();
 
 		let velocity = {
@@ -66,17 +65,13 @@ impl PhysEffect {
 			parent_angle + effect.angle + rng.gen_range(-effect.angle_rng..=effect.angle_rng)
 		};
 
-		println!("{:?}", effect.angvel_rng);
+		ParticleBuilder {
+			sprite: effect.sprite,
+			pos,
+			velocity,
 
-		let rb = RigidBodyBuilder::new(RigidBodyType::KinematicVelocityBased)
-			.position(pos.into())
-			.rotation(angle)
-			.angvel(angvel)
-			.linvel(velocity);
-
-		PhysEffect {
-			anim: SpriteAutomaton::new(ct, effect.sprite),
-			rigid_body: wrapper.insert_rigid_body(rb.build()),
+			angle,
+			angvel,
 
 			lifetime: 0f32
 				.max(effect.lifetime + rng.gen_range(-effect.lifetime_rng..=effect.lifetime_rng)),
@@ -85,28 +80,6 @@ impl PhysEffect {
 			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)),
-
-			is_destroyed: false,
 		}
 	}
-
-	/// Step this effect's state by `t` seconds
-	pub fn step(&mut self, res: &PhysStepResources, wrapper: &mut PhysWrapper) {
-		if self.is_destroyed {
-			return;
-		}
-
-		self.anim.step(res.ct, res.t);
-		self.lifetime -= res.t;
-
-		if self.lifetime <= 0.0 {
-			wrapper.remove_rigid_body(self.rigid_body);
-			self.is_destroyed = true;
-		}
-	}
-
-	/// Should this effect be deleted?
-	pub fn is_destroyed(&self) -> bool {
-		self.is_destroyed
-	}
 }

crates/system/src/phys/physimage.rs

@@ -1,95 +0,0 @@
-//! Provides a snapshot of one frame of a physics simulation
-
-use std::collections::HashMap;
-
-use super::{
-	objects::{PhysEffect, PhysProjectile, PhysShip},
-	PhysSimShipHandle,
-};
-use rapier2d::dynamics::RigidBody;
-
-/// A snapshot of one frame of a physics simulation
-#[derive(Debug)]
-pub struct PhysImage {
-	/// The ships in this frame
-	pub(crate) ships: Vec<PhysShipImage>,
-
-	/// Map ship handles to indices in ships
-	pub(crate) ship_map: HashMap<PhysSimShipHandle, usize>,
-
-	/// The projectiles in this frame
-	pub(crate) projectiles: Vec<PhysProjectileImage>,
-
-	/// The effects in this frame
-	pub(crate) effects: Vec<PhysEffectImage>,
-}
-
-impl PhysImage {
-	/// Create an empty simulation image
-	pub fn new() -> Self {
-		Self {
-			ships: Vec::new(),
-			projectiles: Vec::new(),
-			ship_map: HashMap::new(),
-			effects: Vec::new(),
-		}
-	}
-
-	/// Clear all buffers in this image
-	pub fn clear(&mut self) {
-		self.ship_map.clear();
-		self.projectiles.clear();
-		self.effects.clear();
-		self.ships.clear();
-	}
-
-	/// Iterate ships in this image
-	pub fn iter_ships(&self) -> impl Iterator<Item = &PhysShipImage> {
-		self.ships.iter()
-	}
-
-	/// Get a ship by its handle
-	pub fn get_ship(&self, handle: &PhysSimShipHandle) -> Option<&PhysShipImage> {
-		self.ship_map.get(handle).map(|x| &self.ships[*x])
-	}
-
-	/// Iterate projectiles in this image
-	pub fn iter_projectiles(&self) -> impl Iterator<Item = &PhysProjectileImage> {
-		self.projectiles.iter()
-	}
-
-	/// Iterate effects in this image
-	pub fn iter_effects(&self) -> impl Iterator<Item = &PhysEffectImage> {
-		self.effects.iter()
-	}
-}
-
-/// A snapshot of a ship's state
-#[derive(Debug)]
-pub struct PhysShipImage {
-	/// The ship's data
-	pub ship: PhysShip,
-
-	/// The ship's rigidbody
-	pub rigidbody: RigidBody,
-}
-
-/// a snapshot of a projectile's state
-#[derive(Debug)]
-pub struct PhysProjectileImage {
-	/// The projectile's data
-	pub projectile: PhysProjectile,
-
-	/// The projectile's rigidbody
-	pub rigidbody: RigidBody,
-}
-
-/// a snapshot of a projectile's state
-#[derive(Debug)]
-pub struct PhysEffectImage {
-	/// The effect's data
-	pub effect: PhysEffect,
-
-	/// The effect's rigidbody
-	pub rigidbody: RigidBody,
-}

crates/system/src/phys/physsim.rs

@@ -1,372 +0,0 @@
-use galactica_content::Relationship;
-use galactica_content::{Content, FactionHandle, ShipHandle, SystemHandle};
-use galactica_playeragent::PlayerAgent;
-use nalgebra::{Isometry2, Point2, Rotation2, Vector2};
-use rand::Rng;
-use rapier2d::{
-	dynamics::RigidBodyBuilder,
-	geometry::{ColliderHandle, Group, InteractionGroups},
-};
-use std::collections::HashMap;
-
-use super::PhysEffectImage;
-use super::{
-	objects::{PhysEffect, PhysProjectile, PhysShip},
-	PhysImage, PhysProjectileImage, PhysShipImage, PhysStepResources, PhysWrapper,
-};
-use crate::data::{ShipAutoPilot, ShipPersonality, ShipState};
-
-// TODO: replace with a more generic handle
-/// A handle for a ship in this simulation
-/// This lets other crates reference ships
-/// without including `rapier2d`.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub struct PhysSimShipHandle(pub ColliderHandle);
-
-pub(super) struct NewObjects {
-	pub projectiles: Vec<PhysProjectile>,
-	pub effects: Vec<PhysEffect>,
-}
-
-/// A list of new objects to create this frame
-impl NewObjects {
-	/// Create an empty NewObjects
-	/// This should only be called once in each PhysSim
-	pub fn new() -> Self {
-		Self {
-			projectiles: Vec::new(),
-			effects: Vec::new(),
-		}
-	}
-
-	/// Clear all lists in this struct.
-	/// Call after saving all new objects.
-	pub fn clear(&mut self) {
-		self.projectiles.clear();
-		self.effects.clear();
-	}
-}
-
-/// Manages the physics state of one system
-pub struct PhysSim {
-	/// The system this sim is attached to
-	_system: SystemHandle,
-
-	wrapper: PhysWrapper,
-
-	new: NewObjects,
-
-	effects: Vec<PhysEffect>,
-	projectiles: HashMap<ColliderHandle, PhysProjectile>,
-	ships: HashMap<ColliderHandle, PhysShip>,
-}
-
-// Private methods
-impl PhysSim {
-	pub(super) fn start_unland_ship(&mut self, ct: &Content, collider: ColliderHandle) {
-		let ship = self.ships.get_mut(&collider).unwrap();
-		let obj = ship.data.get_state().landed_on().unwrap();
-		let obj = ct.get_system_object(obj);
-
-		let mut rng = rand::thread_rng();
-		let radius = rng.gen_range(500.0..=1500.0);
-		let angle = rng.gen_range(0.0..std::f32::consts::TAU);
-		let target_offset = Rotation2::new(angle) * Vector2::new(radius, 0.0);
-		let target_trans = Vector2::new(obj.pos.x, obj.pos.y) + target_offset;
-		let target_pos = Isometry2::new(target_trans, angle);
-
-		ship.data.start_unland_to(ct, target_pos);
-
-		let r = self.wrapper.get_rigid_body_mut(ship.rigid_body).unwrap();
-		r.set_enabled(true);
-		r.set_position(
-			Isometry2::new(Vector2::new(obj.pos.x, obj.pos.y), angle),
-			true,
-		);
-	}
-
-	pub(super) fn collide_projectile_ship(
-		&mut self,
-		res: &mut PhysStepResources,
-		projectile_h: ColliderHandle,
-		ship_h: ColliderHandle,
-	) {
-		let projectile = self.projectiles.get_mut(&projectile_h);
-		let ship = self.ships.get_mut(&ship_h);
-		if projectile.is_none() || ship.is_none() {
-			return;
-		}
-		let projectile = projectile.unwrap();
-		let ship = ship.unwrap();
-
-		let f = res.ct.get_faction(projectile.faction);
-		let r = f.relationships.get(&ship.data.get_faction()).unwrap();
-		let destory_projectile = match r {
-			Relationship::Hostile => match ship.data.get_state() {
-				ShipState::Flying { .. } => {
-					ship.data.apply_damage(projectile.content.damage);
-					true
-				}
-				ShipState::Collapsing { .. } => true,
-				_ => false,
-			},
-			_ => false,
-		};
-
-		if destory_projectile {
-			let pr = self.wrapper.get_rigid_body(projectile.rigid_body).unwrap();
-			let v =
-				pr.velocity_at_point(pr.center_of_mass()).normalize() * projectile.content.force;
-			let pos = *pr.translation();
-			let _ = pr;
-
-			let r = self.wrapper.get_rigid_body_mut(ship.rigid_body).unwrap();
-			r.apply_impulse_at_point(Vector2::new(v.x, v.y), Point2::new(pos.x, pos.y), true);
-
-			// Borrow again, we can only have one at a time
-			let pr = self.wrapper.get_rigid_body(projectile.rigid_body).unwrap();
-			let pos = *pr.translation();
-			let angle = pr.rotation().angle();
-
-			match &projectile.content.impact_effect {
-				None => {}
-				Some(x) => {
-					let r = ship.rigid_body;
-					let sr = self.wrapper.get_rigid_body(r).unwrap();
-					let parent_velocity = pr.velocity_at_point(pr.center_of_mass());
-					let target_velocity =
-						sr.velocity_at_point(&nalgebra::Point2::new(pos.x, pos.y));
-
-					self.effects.push(PhysEffect::new(
-						res.ct,
-						&mut self.wrapper,
-						*x,
-						pos,
-						angle,
-						parent_velocity,
-						target_velocity,
-					));
-				}
-			};
-
-			projectile.destroy_silent(res, &mut self.new, &mut self.wrapper);
-		}
-	}
-}
-
-// Public methods
-impl PhysSim {
-	/// Create a new physics system
-	pub fn new(_ct: &Content, system: SystemHandle) -> Self {
-		Self {
-			_system: system,
-			wrapper: PhysWrapper::new(),
-
-			new: NewObjects::new(),
-			effects: Vec::new(),
-			projectiles: HashMap::new(),
-			ships: HashMap::new(),
-		}
-	}
-
-	/// Add a ship to this physics system
-	pub fn add_ship(
-		&mut self,
-		ct: &Content,
-		handle: ShipHandle,
-		faction: FactionHandle,
-		personality: ShipPersonality,
-		position: Point2<f32>,
-	) -> PhysSimShipHandle {
-		let ship_content = ct.get_ship(handle);
-		let mut cl = ship_content.collider.0.clone();
-		// TODO: additonal ship mass from outfits and cargo
-
-		let rb = RigidBodyBuilder::dynamic()
-			.angular_damping(ship_content.angular_drag)
-			.linear_damping(ship_content.linear_drag)
-			.translation(Vector2::new(position.x, position.y))
-			.can_sleep(false);
-
-		cl.set_collision_groups(InteractionGroups::new(
-			Group::GROUP_1,
-			Group::GROUP_1 | Group::GROUP_2,
-		));
-
-		let ridid_body = self.wrapper.insert_rigid_body(rb.build());
-		let collider = self.wrapper.insert_collider(cl, ridid_body);
-
-		self.ships.insert(
-			collider,
-			PhysShip::new(ct, handle, personality, faction, ridid_body, collider),
-		);
-
-		return PhysSimShipHandle(collider);
-	}
-
-	/// Update a player ship's controls
-	pub fn update_player_controls(&mut self, ct: &Content, player: &PlayerAgent) {
-		if player.ship.is_none() {
-			return;
-		}
-		let ship_object = self.ships.get_mut(&player.ship.unwrap());
-		if let Some(ship_object) = ship_object {
-			match ship_object.data.get_state() {
-				ShipState::Landing { .. }
-				| ShipState::UnLanding { .. }
-				| ShipState::Collapsing { .. }
-				| ShipState::Dead => {}
-
-				ShipState::Flying {
-					autopilot: ShipAutoPilot::None,
-				} => {
-					ship_object.controls.guns = player.input.pressed_guns();
-					ship_object.controls.left = player.input.pressed_left();
-					ship_object.controls.right = player.input.pressed_right();
-					ship_object.controls.thrust = player.input.pressed_thrust();
-
-					if player.input.pressed_land() {
-						ship_object.data.set_autopilot(ShipAutoPilot::Landing {
-							target: player.selection.get_planet().unwrap(),
-						})
-					}
-				}
-
-				ShipState::Flying { .. } => {
-					// Any input automatically releases autopilot
-					if player.input.pressed_left()
-						|| player.input.pressed_right()
-						|| player.input.pressed_thrust()
-						|| player.input.pressed_guns()
-					{
-						ship_object.data.set_autopilot(ShipAutoPilot::None);
-					}
-				}
-
-				ShipState::Landed { .. } => {
-					if player.input.pressed_land() {
-						self.start_unland_ship(ct, player.ship.unwrap());
-					}
-				}
-			};
-		}
-	}
-
-	/// Step this simulation by `t` seconds
-	pub fn step(&mut self, mut res: PhysStepResources, img: &PhysImage) {
-		res.timing.start_physics_sim();
-
-		// Update physics
-		self.wrapper.step(res.t);
-
-		// Handle collision events
-		while let Ok(event) = &self.wrapper.collision_queue.try_recv() {
-			if event.started() {
-				let a = event.collider1();
-				let b = event.collider2();
-
-				// If projectiles are part of this collision, make sure
-				// `a` is one of them.
-				let (a, b) = if self.projectiles.contains_key(&b) {
-					(b, a)
-				} else {
-					(a, b)
-				};
-
-				let p = self.projectiles.get(&a);
-				let s = self.ships.get_mut(&b);
-				if p.is_none() || s.is_none() {
-					continue;
-				}
-				self.collide_projectile_ship(&mut res, a, b);
-			}
-		}
-
-		// Step and garbage-collect projectiles
-		self.projectiles.retain(|_, proj| {
-			proj.step(&mut res, &mut self.new, &mut self.wrapper);
-			!proj.should_remove()
-		});
-
-		// Step and garbage-collect ships
-		res.timing.start_physics_ships();
-		self.ships.retain(|_, ship| {
-			ship.step(&mut res, img, &mut self.wrapper, &mut self.new);
-			!ship.should_remove()
-		});
-		res.timing.mark_physics_ships();
-
-		// Step and garbage-collect effects
-		self.effects.retain_mut(|x| {
-			x.step(&res, &mut self.wrapper);
-			!x.is_destroyed()
-		});
-
-		// Process new objects
-		for p in self.new.projectiles.iter() {
-			self.projectiles.insert(p.collider, p.clone());
-		}
-		for e in self.new.effects.iter() {
-			self.effects.push(e.clone());
-		}
-		self.new.clear();
-
-		res.timing.mark_physics_sim();
-	}
-
-	/// Update an image with the current simulation state
-	pub fn update_image(&self, img: &mut PhysImage) {
-		img.clear();
-
-		for s in self.ships.values() {
-			img.ship_map
-				.insert(PhysSimShipHandle(s.collider), img.ships.len());
-			img.ships.push(PhysShipImage {
-				ship: s.clone(),
-				rigidbody: self.wrapper.get_rigid_body(s.rigid_body).unwrap().clone(),
-			})
-		}
-
-		for p in self.projectiles.values() {
-			img.projectiles.push(PhysProjectileImage {
-				projectile: p.clone(),
-				rigidbody: self.wrapper.get_rigid_body(p.rigid_body).unwrap().clone(),
-			})
-		}
-
-		for e in self.effects.iter() {
-			img.effects.push(PhysEffectImage {
-				effect: e.clone(),
-				rigidbody: self.wrapper.get_rigid_body(e.rigid_body).unwrap().clone(),
-			})
-		}
-	}
-}
-
-// Public getters
-impl PhysSim {
-	/// Get a ship physics object
-	pub fn get_ship(&self, ship: &PhysSimShipHandle) -> Option<&PhysShip> {
-		self.ships.get(&ship.0)
-	}
-
-	/// Get a ship physics object
-	pub fn get_ship_mut(&mut self, ship: &PhysSimShipHandle) -> Option<&mut PhysShip> {
-		self.ships.get_mut(&ship.0)
-	}
-
-	/// Iterate over all ships in this physics system
-	pub fn iter_ships(&self) -> impl Iterator<Item = &PhysShip> + '_ {
-		self.ships.values()
-	}
-
-	/// Iterate over all ships in this physics system
-	pub fn iter_projectiles(&self) -> impl Iterator<Item = &PhysProjectile> + '_ {
-		self.projectiles.values()
-	}
-
-	/// Iterate over all particles in this physics system
-	pub fn iter_particles(&self) -> impl Iterator<Item = &PhysEffect> + '_ {
-		self.effects.iter()
-	}
-}

crates/system/src/phys/physwrapper.rs

@@ -1,124 +0,0 @@
-use crossbeam::channel::Receiver;
-use rapier2d::{
-	dynamics::{
-		CCDSolver, ImpulseJointSet, IntegrationParameters, IslandManager, MultibodyJointSet,
-		RigidBody, RigidBodyHandle, RigidBodySet,
-	},
-	geometry::{BroadPhase, Collider, ColliderHandle, ColliderSet, CollisionEvent, NarrowPhase},
-	na::vector,
-	pipeline::{ChannelEventCollector, PhysicsPipeline},
-};
-
-/// Wraps Rapier2d physics parameters
-pub struct PhysWrapper {
-	ip: IntegrationParameters,
-	pp: PhysicsPipeline,
-	im: IslandManager,
-	bp: BroadPhase,
-	np: NarrowPhase,
-	ij: ImpulseJointSet,
-	mj: MultibodyJointSet,
-	ccd: CCDSolver,
-
-	rigid_body_set: RigidBodySet,
-	collider_set: ColliderSet,
-
-	collision_handler: ChannelEventCollector,
-
-	/// Collision event queue
-	/// this should be emptied after every frame.
-	pub collision_queue: Receiver<CollisionEvent>,
-}
-
-impl PhysWrapper {
-	/// Make a new physics wrapper
-	pub fn new() -> Self {
-		let (collision_send, collision_queue) = crossbeam::channel::unbounded();
-		let (contact_force_send, _) = crossbeam::channel::unbounded();
-
-		Self {
-			ip: IntegrationParameters::default(),
-			pp: PhysicsPipeline::new(),
-			im: IslandManager::new(),
-			bp: BroadPhase::new(),
-			np: NarrowPhase::new(),
-			ij: ImpulseJointSet::new(),
-			mj: MultibodyJointSet::new(),
-			ccd: CCDSolver::new(),
-			collision_queue,
-			collision_handler: ChannelEventCollector::new(collision_send, contact_force_send),
-
-			rigid_body_set: RigidBodySet::new(),
-			collider_set: ColliderSet::new(),
-		}
-	}
-
-	/// Step physics sim by `t` seconds
-	pub fn step(&mut self, t: f32) {
-		self.ip.dt = t;
-		self.pp.step(
-			&vector![0.0, 0.0],
-			&self.ip,
-			&mut self.im,
-			&mut self.bp,
-			&mut self.np,
-			&mut self.rigid_body_set,
-			&mut self.collider_set,
-			&mut self.ij,
-			&mut self.mj,
-			&mut self.ccd,
-			None,
-			&(),
-			&mut self.collision_handler,
-		);
-	}
-
-	/// Remove a rigid body and all its colliders from this physics wrapper
-	pub fn remove_rigid_body(&mut self, body: RigidBodyHandle) -> Option<RigidBody> {
-		return self.rigid_body_set.remove(
-			body,
-			&mut self.im,
-			&mut self.collider_set,
-			&mut self.ij,
-			&mut self.mj,
-			true,
-		);
-	}
-}
-
-impl PhysWrapper {
-	/// Get a rigidbody from this physics wrapper
-	pub fn get_rigid_body(&self, h: RigidBodyHandle) -> Option<&RigidBody> {
-		self.rigid_body_set.get(h)
-	}
-
-	/// Get a rigidbody from this physics wrapper, mutably
-	pub fn get_rigid_body_mut(&mut self, h: RigidBodyHandle) -> Option<&mut RigidBody> {
-		self.rigid_body_set.get_mut(h)
-	}
-
-	/// Get a collider from this physics wrapper
-	pub fn get_collider(&self, h: ColliderHandle) -> Option<&Collider> {
-		self.collider_set.get(h)
-	}
-
-	/// Get a collider from this physics wrapper, mutably
-	pub fn get_collider_mut(&mut self, h: ColliderHandle) -> Option<&mut Collider> {
-		self.collider_set.get_mut(h)
-	}
-
-	/// Add a rigid body
-	pub fn insert_rigid_body(&mut self, rb: RigidBody) -> RigidBodyHandle {
-		self.rigid_body_set.insert(rb)
-	}
-
-	/// Attach a collider to a rigid body
-	pub fn insert_collider(
-		&mut self,
-		collider: Collider,
-		parent_handle: RigidBodyHandle,
-	) -> ColliderHandle {
-		self.collider_set
-			.insert_with_parent(collider, parent_handle, &mut self.rigid_body_set)
-	}
-}

crates/system/src/phys/stepresources.rs

@@ -1,3 +1,4 @@
+use super::{wrapper::Wrapper, ParticleBuilder};
 use galactica_content::Content;
 use galactica_util::timing::Timing;
 
@@ -9,6 +10,12 @@ pub struct PhysStepResources<'a> {
 	/// Length of time step
 	pub t: f32,
 
+	/// Particles to create
+	pub particles: &'a mut Vec<ParticleBuilder>,
+
 	/// Record detailed frame timing breakdown
 	pub timing: &'a mut Timing,
+
+	/// Physics computer
+	pub wrapper: &'a mut Wrapper,
 }

crates/system/src/phys/systemsim/mod.rs

@@ -0,0 +1,187 @@
+use galactica_content::{Content, FactionHandle, ShipHandle, SystemHandle};
+use galactica_playeragent::PlayerAgent;
+use nalgebra::{Point2, Vector2};
+
+use rapier2d::{
+	dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle, RigidBodySet},
+	geometry::{ColliderHandle, ColliderSet, Group, InteractionGroups},
+};
+use std::collections::HashMap;
+
+use crate::data::{ShipAutoPilot, ShipPersonality, ShipState};
+
+use super::{
+	controller::ShipController,
+	objects::{PhysProjectile, PhysSimShip},
+};
+
+// TODO: replace with a more generic handle
+/// A handle for a ship in this simulation
+/// This lets other crates reference ships
+/// without including `rapier2d`.
+pub struct PhysSimShipHandle(pub ColliderHandle);
+
+/// Manages the physics state of one system
+#[derive(Clone)]
+pub struct PhysSim {
+	/// The system this sim is attached to
+	_system: SystemHandle,
+
+	rigid_body_set: RigidBodySet,
+	collider_set: ColliderSet,
+
+	projectiles: HashMap<ColliderHandle, PhysProjectile>,
+	ships: HashMap<ColliderHandle, PhysSimShip>,
+	ship_behaviors: HashMap<ColliderHandle, ShipController>,
+}
+
+mod step;
+mod steputil;
+
+// Public methods
+impl PhysSim {
+	/// Create a new physics system
+	pub fn new(_ct: &Content, system: SystemHandle) -> Self {
+		Self {
+			_system: system,
+			rigid_body_set: RigidBodySet::new(),
+			collider_set: ColliderSet::new(),
+			projectiles: HashMap::new(),
+			ships: HashMap::new(),
+			ship_behaviors: HashMap::new(),
+		}
+	}
+
+	/// Add a ship to this physics system
+	pub fn add_ship(
+		&mut self,
+		ct: &Content,
+		handle: ShipHandle,
+		faction: FactionHandle,
+		personality: ShipPersonality,
+		position: Point2<f32>,
+	) -> PhysSimShipHandle {
+		let ship_content = ct.get_ship(handle);
+		let mut cl = ship_content.collider.0.clone();
+		// TODO: additonal ship mass from outfits and cargo
+
+		let rb = RigidBodyBuilder::dynamic()
+			.angular_damping(ship_content.angular_drag)
+			.linear_damping(ship_content.linear_drag)
+			.translation(Vector2::new(position.x, position.y))
+			.can_sleep(false);
+
+		cl.set_collision_groups(InteractionGroups::new(
+			Group::GROUP_1,
+			Group::GROUP_1 | Group::GROUP_2,
+		));
+
+		let ridid_body = self.rigid_body_set.insert(rb.build());
+		let collider =
+			self.collider_set
+				.insert_with_parent(cl, ridid_body, &mut self.rigid_body_set);
+
+		self.ship_behaviors.insert(
+			collider,
+			match personality {
+				ShipPersonality::Dummy | ShipPersonality::Player => ShipController::new_null(),
+				ShipPersonality::Point => ShipController::new_point(),
+			},
+		);
+
+		self.ships.insert(
+			collider,
+			PhysSimShip::new(ct, handle, personality, faction, ridid_body, collider),
+		);
+
+		return PhysSimShipHandle(collider);
+	}
+
+	/// Update a player ship's controls
+	pub fn update_player_controls(&mut self, ct: &Content, player: &PlayerAgent) {
+		if player.ship.is_none() {
+			return;
+		}
+		let ship_object = self.ships.get_mut(&player.ship.unwrap());
+		if let Some(ship_object) = ship_object {
+			match ship_object.data.get_state() {
+				ShipState::Landing { .. }
+				| ShipState::UnLanding { .. }
+				| ShipState::Collapsing { .. }
+				| ShipState::Dead => {}
+
+				ShipState::Flying {
+					autopilot: ShipAutoPilot::None,
+				} => {
+					ship_object.controls.guns = player.input.pressed_guns();
+					ship_object.controls.left = player.input.pressed_left();
+					ship_object.controls.right = player.input.pressed_right();
+					ship_object.controls.thrust = player.input.pressed_thrust();
+
+					if player.input.pressed_land() {
+						ship_object.data.set_autopilot(ShipAutoPilot::Landing {
+							target: player.selection.get_planet().unwrap(),
+						})
+					}
+				}
+
+				ShipState::Flying { .. } => {
+					// Any input automatically releases autopilot
+					if player.input.pressed_left()
+						|| player.input.pressed_right()
+						|| player.input.pressed_thrust()
+						|| player.input.pressed_guns()
+					{
+						ship_object.data.set_autopilot(ShipAutoPilot::None);
+					}
+				}
+
+				ShipState::Landed { .. } => {
+					if player.input.pressed_land() {
+						self.start_unland_ship(ct, player.ship.unwrap());
+					}
+				}
+			};
+		}
+	}
+}
+
+// Public getters
+impl PhysSim {
+	/// Get a ship physics object
+	pub fn get_ship(&self, ship: &PhysSimShipHandle) -> Option<&PhysSimShip> {
+		self.ships.get(&ship.0)
+	}
+
+	/// Get a ship physics object
+	pub fn get_ship_mut(&mut self, ship: &PhysSimShipHandle) -> Option<&mut PhysSimShip> {
+		self.ships.get_mut(&ship.0)
+	}
+
+	/// Get a rigid body from a handle
+	pub fn get_rigid_body(&self, r: RigidBodyHandle) -> Option<&RigidBody> {
+		self.rigid_body_set.get(r)
+	}
+
+	/// Get a rigid body from a handle
+	pub fn get_rigid_body_mut(&mut self, r: RigidBodyHandle) -> Option<&mut RigidBody> {
+		self.rigid_body_set.get_mut(r)
+	}
+
+	/// Iterate over all ships in this physics system
+	pub fn iter_ship_body(&self) -> impl Iterator<Item = (&PhysSimShip, &RigidBody)> + '_ {
+		self.ships
+			.values()
+			.map(|x| (x, self.rigid_body_set.get(x.rigid_body).unwrap()))
+	}
+
+	/// Iterate over all ships in this physics system
+	pub fn iter_ships(&self) -> impl Iterator<Item = &PhysSimShip> + '_ {
+		self.ships.values()
+	}
+
+	/// Iterate over all ships in this physics system
+	pub fn iter_projectiles(&self) -> impl Iterator<Item = &PhysProjectile> + '_ {
+		self.projectiles.values()
+	}
+}

crates/system/src/phys/systemsim/step.rs

@@ -0,0 +1,334 @@
+use galactica_content::{GunPoint, OutfitHandle, ProjectileCollider};
+use nalgebra::{Rotation2, Vector2};
+use rand::Rng;
+use rapier2d::{
+	dynamics::RigidBodyBuilder,
+	geometry::{ColliderBuilder, Group, InteractionGroups},
+	pipeline::ActiveEvents,
+};
+
+use crate::{
+	data::{ShipAutoPilot, ShipState},
+	phys::{
+		controller::autopilot,
+		objects::{PhysProjectile, ShipControls},
+		ParticleBuilder, PhysStepResources,
+	},
+};
+
+use super::PhysSim;
+
+impl PhysSim {
+	/// Run ship updates:
+	/// - updates ship controls (runs behaviors)
+	/// - applies ship controls
+	/// - creates projectiles
+	fn step_ships(&mut self, res: &mut PhysStepResources) {
+		// We can't apply these right away since self is borrowed
+		// by the iterator
+		// TODO: don't allocate!
+		let mut projectiles = Vec::new();
+		let mut to_remove = Vec::new();
+		// Again, borrow checker hack. TODO: fix
+		let keys: Vec<_> = self.ships.keys().map(|c| *c).collect();
+		for collider in keys {
+			// Borrow immutably for now...
+			// (required to compute controls)
+			let ship = self.ships.get(&collider).unwrap();
+			match ship.data.get_state() {
+				ShipState::Dead => {
+					to_remove.push(collider);
+				}
+
+				ShipState::Landed { .. } | ShipState::Collapsing { .. } => {
+					let ship = self.ships.get_mut(&collider).unwrap();
+					ship.step(
+						res,
+						&mut self.rigid_body_set[ship.rigid_body],
+						&mut self.collider_set[ship.collider],
+					);
+				}
+
+				ShipState::UnLanding {
+					to_position,
+					current_z,
+					from,
+				} => {
+					let from_obj = res.ct.get_system_object(*from);
+					let controls = autopilot::auto_landing(
+						&res,
+						&self.rigid_body_set,
+						&self.ships,
+						ship.collider,
+						Vector2::new(to_position.translation.x, to_position.translation.y),
+					);
+					let r = &mut self.rigid_body_set[ship.rigid_body];
+					let max_d = (Vector2::new(from_obj.pos.x, from_obj.pos.y)
+						- Vector2::new(to_position.translation.x, to_position.translation.y))
+					.magnitude();
+					let now_d = (r.translation()
+						- Vector2::new(to_position.translation.x, to_position.translation.y))
+					.magnitude();
+					let f = now_d / max_d;
+
+					let current_z = *current_z;
+					let ship = self.ships.get_mut(&collider).unwrap();
+					let zdist = 1.0 - from_obj.pos.z;
+
+					if current_z <= 1.0 {
+						self.finish_unland_ship(collider);
+					} else if current_z <= 1.5 {
+						ship.data
+							.set_unlanding_z(1f32.max(current_z - (0.5 * res.t) / 0.5));
+						ship.controls = ShipControls::new();
+					} else {
+						ship.data.set_unlanding_z(1.0 - zdist * f);
+
+						if let Some(controls) = controls {
+							ship.controls = controls;
+						}
+						ship.step(res, r, &mut self.collider_set[ship.collider])
+					};
+				}
+
+				ShipState::Landing { target, current_z } => {
+					let target_obj = res.ct.get_system_object(*target);
+					let controls = autopilot::auto_landing(
+						&res,
+						&self.rigid_body_set,
+						&self.ships,
+						ship.collider,
+						Vector2::new(target_obj.pos.x, target_obj.pos.y),
+					);
+
+					let current_z = *current_z;
+					let ship = self.ships.get_mut(&collider).unwrap();
+					let r = &mut self.rigid_body_set[ship.rigid_body];
+					let zdist = target_obj.pos.z - 1.0;
+
+					if current_z >= target_obj.pos.z {
+						self.finish_land_ship(collider);
+					} else {
+						ship.data.set_landing_z(current_z + zdist * res.t / 2.0);
+
+						if let Some(controls) = controls {
+							ship.controls = controls;
+						}
+						ship.step(res, r, &mut self.collider_set[ship.collider])
+					};
+				}
+
+				ShipState::Flying { autopilot } => {
+					// Compute new controls
+					// This is why we borrow immutably first
+					let controls = match autopilot {
+						ShipAutoPilot::Landing {
+							target: target_handle,
+						} => {
+							let target_obj = res.ct.get_system_object(*target_handle);
+							let controls = autopilot::auto_landing(
+								&res,
+								&self.rigid_body_set,
+								&self.ships,
+								ship.collider,
+								Vector2::new(target_obj.pos.x, target_obj.pos.y),
+							);
+
+							let landed = self.try_land_ship(res.ct, collider, *target_handle);
+							if landed {
+								None
+							} else {
+								controls
+							}
+						}
+
+						ShipAutoPilot::None => {
+							let b = self.ship_behaviors.get_mut(&collider).unwrap();
+							b.update_controls(
+								&res,
+								&self.rigid_body_set,
+								&self.ships,
+								ship.collider,
+							)
+						}
+					};
+
+					// Re-borrow mutably to apply changes
+					let ship = self.ships.get_mut(&collider).unwrap();
+
+					if let Some(controls) = controls {
+						ship.controls = controls;
+					}
+					ship.step(
+						res,
+						&mut self.rigid_body_set[ship.rigid_body],
+						&mut self.collider_set[ship.collider],
+					);
+
+					// If we're firing, try to fire each gun
+					if ship.controls.guns {
+						// TODO: don't allocate here. This is a hack to satisfy the borrow checker,
+						// convert this to a refcell or do the replace dance.
+						let pairs: Vec<(GunPoint, Option<OutfitHandle>)> = ship
+							.data
+							.get_outfits()
+							.iter_gun_points()
+							.map(|(p, o)| (p.clone(), o.clone()))
+							.collect();
+
+						for (gun, outfit) in pairs {
+							if ship.data.fire_gun(res.ct, &gun) {
+								projectiles.push((ship.collider, gun.clone(), outfit.unwrap()));
+							}
+						}
+					}
+				}
+			}
+		}
+
+		// Remove ships that don't exist
+		for c in to_remove {
+			self.remove_ship(res, c);
+		}
+
+		// Create projectiles
+		for (collider, gun_point, outfit) in projectiles {
+			let mut rng = rand::thread_rng();
+
+			let ship = self.ships.get(&collider).unwrap();
+			let rigid_body = self.get_rigid_body(ship.rigid_body).unwrap();
+			let ship_pos = rigid_body.translation();
+			let ship_rot = rigid_body.rotation();
+			let ship_ang = ship_rot.angle();
+			let ship_vel = rigid_body.velocity_at_point(rigid_body.center_of_mass());
+
+			let pos = ship_pos + (ship_rot * gun_point.pos);
+
+			let outfit = res.ct.get_outfit(outfit);
+			let outfit = outfit.gun.as_ref().unwrap();
+
+			let spread = rng.gen_range(-outfit.projectile.angle_rng..=outfit.projectile.angle_rng);
+			let vel = ship_vel
+				+ (Rotation2::new(ship_ang + spread)
+					* Vector2::new(
+						outfit.projectile.speed
+							+ rng.gen_range(
+								-outfit.projectile.speed_rng..=outfit.projectile.speed_rng,
+							),
+						0.0,
+					));
+
+			let rigid_body = RigidBodyBuilder::kinematic_velocity_based()
+				.translation(pos)
+				.rotation(ship_ang)
+				.linvel(vel)
+				.build();
+
+			let mut collider = match &outfit.projectile.collider {
+				ProjectileCollider::Ball(b) => ColliderBuilder::ball(b.radius)
+					.sensor(true)
+					.active_events(ActiveEvents::COLLISION_EVENTS)
+					.build(),
+			};
+
+			collider.set_collision_groups(InteractionGroups::new(Group::GROUP_2, Group::GROUP_1));
+
+			let rigid_body = self.rigid_body_set.insert(rigid_body);
+			let collider = self.collider_set.insert_with_parent(
+				collider,
+				rigid_body,
+				&mut self.rigid_body_set,
+			);
+
+			self.projectiles.insert(
+				collider.clone(),
+				PhysProjectile::new(
+					res.ct,
+					outfit.projectile.clone(),
+					rigid_body,
+					ship.data.get_faction(),
+					collider,
+				),
+			);
+		}
+	}
+
+	/// Step this physics system by `t` seconds
+	pub fn step(&mut self, mut res: PhysStepResources) {
+		res.timing.start_physics_ships();
+		self.step_ships(&mut res);
+		res.timing.mark_physics_ships();
+
+		res.timing.start_physics_sim();
+
+		// Update physics
+		res.wrapper
+			.step(res.t, &mut self.rigid_body_set, &mut self.collider_set);
+
+		// Handle collision events
+		while let Ok(event) = &res.wrapper.collision_queue.try_recv() {
+			if event.started() {
+				let a = event.collider1();
+				let b = event.collider2();
+
+				// If projectiles are part of this collision, make sure
+				// `a` is one of them.
+				let (a, b) = if self.projectiles.contains_key(&b) {
+					(b, a)
+				} else {
+					(a, b)
+				};
+
+				let p = self.projectiles.get(&a);
+				let s = self.ships.get_mut(&b);
+				if p.is_none() || s.is_none() {
+					continue;
+				}
+				self.collide_projectile_ship(&mut res, a, b);
+			}
+		}
+
+		// Delete projectiles
+		let mut to_remove = Vec::new();
+		for (c, p) in &mut self.projectiles {
+			p.tick(res.ct, res.t);
+			if p.is_expired() {
+				to_remove.push(*c);
+			}
+		}
+
+		let mut rng = rand::thread_rng();
+		for c in to_remove {
+			let (pr, p) = self.remove_projectile(&mut res, c).unwrap();
+
+			match &p.content.expire_effect {
+				None => {}
+				Some(x) => {
+					let x = res.ct.get_effect(*x);
+					let pos = *pr.translation();
+					let vel = pr.velocity_at_point(pr.center_of_mass());
+					let angle = pr.rotation().angle();
+
+					let velocity = {
+						let a = rng
+							.gen_range(-x.velocity_scale_parent_rng..=x.velocity_scale_parent_rng);
+
+						let velocity = (x.velocity_scale_parent + a) * vel;
+
+						velocity
+					};
+
+					res.particles.push(ParticleBuilder::from_content(
+						x,
+						pos.into(),
+						-angle,
+						velocity,
+						Vector2::new(0.0, 0.0),
+					));
+				}
+			};
+		}
+
+		res.timing.mark_physics_sim();
+	}
+}

crates/system/src/phys/systemsim/steputil.rs

@@ -0,0 +1,212 @@
+use galactica_content::{Content, Relationship, SystemObjectHandle};
+use nalgebra::{Isometry2, Point2, Rotation2, Vector2};
+use rand::Rng;
+use rapier2d::{
+	dynamics::RigidBody,
+	geometry::{ColliderHandle, Group, InteractionGroups},
+};
+
+use crate::{
+	data::ShipState,
+	phys::{objects::PhysProjectile, ParticleBuilder, PhysStepResources},
+};
+
+use super::PhysSim;
+
+// Private methods
+impl PhysSim {
+	pub(super) fn remove_projectile(
+		&mut self,
+		res: &mut PhysStepResources,
+		c: ColliderHandle,
+	) -> Option<(RigidBody, PhysProjectile)> {
+		let p = match self.projectiles.remove(&c) {
+			Some(p) => p,
+			None => return None,
+		};
+		let r = self
+			.rigid_body_set
+			.remove(
+				p.rigid_body,
+				&mut res.wrapper.im,
+				&mut self.collider_set,
+				&mut res.wrapper.ij,
+				&mut res.wrapper.mj,
+				true,
+			)
+			.unwrap();
+
+		return Some((r, p));
+	}
+
+	/// Try to land the given ship on the given planet.
+	/// State changes on success, and nothing happens on failure.
+	/// returns `true` if landing was successful.
+	pub(super) fn try_land_ship(
+		&mut self,
+		ct: &Content,
+		collider: ColliderHandle,
+		target_handle: SystemObjectHandle,
+	) -> bool {
+		let ship = self.ships.get_mut(&collider).unwrap();
+		let r = self.rigid_body_set.get(ship.rigid_body).unwrap();
+
+		let target = ct.get_system_object(target_handle);
+		let t_pos = Vector2::new(target.pos.x, target.pos.y);
+		let s_pos = Vector2::new(r.position().translation.x, r.position().translation.y);
+
+		// TODO: deactivate collider when landing.
+		// Can't just set_active(false), since we still need that collider's mass.
+
+		// We're in land range...
+		if (t_pos - s_pos).magnitude() > target.size / 2.0 {
+			return false;
+		}
+
+		// And we'll stay in land range long enough.
+		if (t_pos - (s_pos + r.velocity_at_point(r.center_of_mass()) * 2.0)).magnitude()
+			> target.size / 2.0
+		{
+			return false;
+		}
+
+		let collider = self.collider_set.get_mut(collider).unwrap();
+		collider.set_collision_groups(InteractionGroups::new(Group::GROUP_1, Group::empty()));
+		ship.data.start_land_on(target_handle);
+		return true;
+	}
+
+	/// Finish landing this ship on a planet.
+	/// Called after the landing animation finishes.
+	pub(super) fn finish_land_ship(&mut self, collider: ColliderHandle) {
+		let ship = self.ships.get_mut(&collider).unwrap();
+		ship.data.finish_land_on();
+		let r = self.rigid_body_set.get_mut(ship.rigid_body).unwrap();
+		r.set_enabled(false);
+		r.set_angvel(0.0, false);
+		r.set_linvel(nalgebra::Vector2::new(0.0, 0.0), false);
+	}
+
+	pub(super) fn start_unland_ship(&mut self, ct: &Content, collider: ColliderHandle) {
+		let ship = self.ships.get_mut(&collider).unwrap();
+		let obj = ship.data.get_state().landed_on().unwrap();
+		let obj = ct.get_system_object(obj);
+
+		let mut rng = rand::thread_rng();
+		let radius = rng.gen_range(500.0..=1500.0);
+		let angle = rng.gen_range(0.0..std::f32::consts::TAU);
+		let target_offset = Rotation2::new(angle) * Vector2::new(radius, 0.0);
+		let target_trans = Vector2::new(obj.pos.x, obj.pos.y) + target_offset;
+		let target_pos = Isometry2::new(target_trans, angle);
+
+		ship.data.start_unland_to(ct, target_pos);
+
+		let r = self.rigid_body_set.get_mut(ship.rigid_body).unwrap();
+		r.set_enabled(true);
+		r.set_position(
+			Isometry2::new(Vector2::new(obj.pos.x, obj.pos.y), angle),
+			true,
+		);
+	}
+
+	pub(super) fn finish_unland_ship(&mut self, collider: ColliderHandle) {
+		let ship = self.ships.get_mut(&collider).unwrap();
+		ship.data.finish_unland_to();
+		self.collider_set
+			.get_mut(ship.collider)
+			.unwrap()
+			.set_collision_groups(InteractionGroups::new(
+				Group::GROUP_1,
+				Group::GROUP_1 | Group::GROUP_2,
+			));
+	}
+
+	pub(super) fn remove_ship(
+		&mut self,
+		res: &mut PhysStepResources,
+		colliderhandle: ColliderHandle,
+	) {
+		let ship = match self.ships.get(&colliderhandle) {
+			None => return,
+			Some(s) => s,
+		};
+
+		self.rigid_body_set.remove(
+			ship.rigid_body,
+			&mut res.wrapper.im,
+			&mut self.collider_set,
+			&mut res.wrapper.ij,
+			&mut res.wrapper.mj,
+			true,
+		);
+		self.ships.remove(&colliderhandle).unwrap();
+		self.ship_behaviors.remove(&colliderhandle);
+	}
+
+	pub(super) fn collide_projectile_ship(
+		&mut self,
+		res: &mut PhysStepResources,
+		projectile_h: ColliderHandle,
+		ship_h: ColliderHandle,
+	) {
+		let projectile = self.projectiles.get(&projectile_h);
+		let ship = self.ships.get_mut(&ship_h);
+		if projectile.is_none() || ship.is_none() {
+			return;
+		}
+		let projectile = projectile.unwrap();
+		let ship = ship.unwrap();
+
+		let f = res.ct.get_faction(projectile.faction);
+		let r = f.relationships.get(&ship.data.get_faction()).unwrap();
+		let destory_projectile = match r {
+			Relationship::Hostile => match ship.data.get_state() {
+				ShipState::Flying { .. } => {
+					ship.data.apply_damage(projectile.content.damage);
+					true
+				}
+				ShipState::Collapsing { .. } => true,
+				_ => false,
+			},
+			_ => false,
+		};
+
+		if destory_projectile {
+			let pr = self.rigid_body_set.get(projectile.rigid_body).unwrap();
+			let v =
+				pr.velocity_at_point(pr.center_of_mass()).normalize() * projectile.content.force;
+			let pos = *pr.translation();
+			let _ = pr;
+
+			let r = self.rigid_body_set.get_mut(ship.rigid_body).unwrap();
+			r.apply_impulse_at_point(Vector2::new(v.x, v.y), Point2::new(pos.x, pos.y), true);
+
+			// Borrow again, we can only have one at a time
+			let pr = self.rigid_body_set.get(projectile.rigid_body).unwrap();
+			let pos = *pr.translation();
+			let angle = pr.rotation().angle();
+
+			match &projectile.content.impact_effect {
+				None => {}
+				Some(x) => {
+					let effect = res.ct.get_effect(*x);
+					let r = ship.rigid_body;
+					let sr = self.get_rigid_body(r).unwrap();
+					let parent_velocity = pr.velocity_at_point(pr.center_of_mass());
+					let target_velocity =
+						sr.velocity_at_point(&nalgebra::Point2::new(pos.x, pos.y));
+
+					res.particles.push(ParticleBuilder::from_content(
+						effect,
+						pos.into(),
+						-angle,
+						parent_velocity,
+						target_velocity,
+					));
+				}
+			};
+
+			self.remove_projectile(res, projectile.collider);
+		}
+	}
+}

crates/system/src/phys/wrapper.rs

@@ -0,0 +1,74 @@
+use crossbeam::channel::Receiver;
+use rapier2d::{
+	dynamics::{
+		CCDSolver, ImpulseJointSet, IntegrationParameters, IslandManager, MultibodyJointSet,
+		RigidBodySet,
+	},
+	geometry::{BroadPhase, ColliderSet, CollisionEvent, NarrowPhase},
+	na::vector,
+	pipeline::{ChannelEventCollector, PhysicsPipeline},
+};
+
+/// Wraps Rapier2d physics parameters
+pub struct Wrapper {
+	pub(crate) ip: IntegrationParameters,
+	pub(crate) pp: PhysicsPipeline,
+	pub(crate) im: IslandManager,
+	pub(crate) bp: BroadPhase,
+	pub(crate) np: NarrowPhase,
+	pub(crate) ij: ImpulseJointSet,
+	pub(crate) mj: MultibodyJointSet,
+	pub(crate) ccd: CCDSolver,
+
+	collision_handler: ChannelEventCollector,
+
+	/// Collision event queue
+	/// this should be emptied after every frame.
+	pub collision_queue: Receiver<CollisionEvent>,
+}
+
+impl Wrapper {
+	/// Make a new physics wrapper
+	pub fn new() -> Self {
+		let (collision_send, collision_queue) = crossbeam::channel::unbounded();
+		let (contact_force_send, _) = crossbeam::channel::unbounded();
+
+		Self {
+			ip: IntegrationParameters::default(),
+			pp: PhysicsPipeline::new(),
+			im: IslandManager::new(),
+			bp: BroadPhase::new(),
+			np: NarrowPhase::new(),
+			ij: ImpulseJointSet::new(),
+			mj: MultibodyJointSet::new(),
+			ccd: CCDSolver::new(),
+			collision_queue,
+			collision_handler: ChannelEventCollector::new(collision_send, contact_force_send),
+		}
+	}
+
+	/// Step physics sim by `t` seconds
+	pub fn step(
+		&mut self,
+		t: f32,
+		rigid_body_set: &mut RigidBodySet,
+		collider_set: &mut ColliderSet,
+	) {
+		self.ip.dt = t;
+		self.pp.step(
+			&vector![0.0, 0.0],
+			&self.ip,
+			&mut self.im,
+			&mut self.bp,
+			&mut self.np,
+			rigid_body_set,
+			collider_set,
+			&mut self.ij,
+			&mut self.mj,
+			&mut self.ccd,
+			None,
+			&(),
+			&mut self.collision_handler,
+		);
+	}
+}

crates/util/src/constants.rs

@@ -3,7 +3,7 @@
 // TODO: many of these should be moved to a config file or cli option
 
 /// We can draw at most this many object sprites on the screen.
-pub const OBJECT_SPRITE_INSTANCE_LIMIT: u64 = 2048;
+pub const OBJECT_SPRITE_INSTANCE_LIMIT: u64 = 500;
 
 /// We can draw at most this many ui sprites on the screen.
 pub const UI_SPRITE_INSTANCE_LIMIT: u64 = 100;
@@ -12,6 +12,9 @@ pub const UI_SPRITE_INSTANCE_LIMIT: u64 = 100;
 /// This is fairly small, since we know exactly how many of these we'll draw (for now)
 pub const RADIALBAR_SPRITE_INSTANCE_LIMIT: u64 = 10;
 
+/// The size of our circular particle buffer. When we create particles, the oldest ones are replaced.
+pub const PARTICLE_SPRITE_INSTANCE_LIMIT: u64 = 1000;
+
 /// The maximum number of sprites we can define
 pub const SPRITE_LIMIT: u32 = 1024;