Added ship collapse sequence

assets

@@ -1 +1 @@
-Subproject commit 38fd6766762ce90bb699f98e30e46b17c4eda50c
+Subproject commit 74ddbde9e1cec1418c17844bc7336324ece88d15

content/effects.toml

@@ -2,13 +2,19 @@
 sprite = "particle::explosion::small"
 lifetime = "inherit"
 inherit_velocity = "target"
-size = 3.0
+size = 8.0
+
+[effect."large explosion"]
+sprite = "particle::explosion::large"
+lifetime = "inherit"
+inherit_velocity = "target"
+size = 25.0
 
 [effect."huge explosion"]
 sprite = "particle::explosion::huge"
 lifetime = "inherit"
 inherit_velocity = "target"
-size = 3.0
+size = 50.0
 
 [effect."blaster expire"]
 sprite = "particle::blaster"
@@ -25,5 +31,4 @@ size = 3.0
 # effect probabilities & variants
 # multiple particles in one effect
 # fade
-# better physics
 # document: effect vs particle

content/ship.toml

@@ -6,6 +6,9 @@ hull = 200
 linear_drag = 0.2
 angular_drag = 0.2
 
+# TODO: disable
+# TODO: damage effects
+
 space.outfit = 200
 space.engine = 50
 space.weapon = 50
@@ -13,6 +16,19 @@ space.weapon = 50
 engines = [{ x = 0.0, y = -1.05, size = 50.0 }]
 guns = [{ x = 0.0, y = 1 }, { x = 0.1, y = 0.80 }, { x = -0.1, y = 0.80 }]
 
+
+# Length of death sequence, in seconds
+collapse.length = 5.0
+
+# Effects to create during the collapse sequence.
+# On average, `count` will be spawned over the sequence,
+# with a distribution of (x^2 + 0.1)
+collapse.effects = [
+	{ effect = "small explosion", count = 30 },
+	{ effect = "large explosion", count = 5 },
+]
+
+
 collision = [
 	#[rustfmt:skip],
 	[0.53921, 1.0000],
@@ -37,3 +53,44 @@ collision = [
 	[-0.53921, 0.29343],
 	[-0.53921, 1.0000],
 ]
+
+
+# Scripted explosion
+[[ship."Gypsum".collapse.event]]
+time = 5.0
+effects = [
+	#[rustfmt:skip],
+	{ effect = "small explosion", count = 8 },
+	{ effect = "large explosion", count = 5 },
+	{ effect = "huge explosion", count = 1, pos = [0, 0] },
+	{ effect = "huge explosion", count = 4 },
+]
+
+# Scripted explosion
+[[ship."Gypsum".collapse.event]]
+time = 0.0
+effects = [
+	#[rustfmt:skip],
+	{ effect = "small explosion", count = 3 },
+	{ effect = "large explosion", count = 1 },
+]
+
+# Play a sprite reel (or change sprite)
+#[[ship."Gypsum".death.collapse.event]]
+#time = 10.0
+#reel = "gypsum post-death"
+
+# Create debris
+#[[ship."Gypsum".death.collapse.event]]
+#time = "end"
+#physics = "inherit"
+# OR (relative to original rigidbody)
+#physics.position = [0, 0]
+#physics.velocity = [0, 0]
+#physics.angle = 0
+#physics.angvel = 0
+#debris = "debris"
+
+# Burning, interactable, destructible debris
+#[debris]
+#effects = [{ type = "small explosion", count = 10 }]

crates/content/src/lib.rs

@@ -21,10 +21,7 @@ use walkdir::WalkDir;
 pub use handle::{
 	EffectHandle, FactionHandle, GunHandle, OutfitHandle, ShipHandle, SpriteHandle, SystemHandle,
 };
-pub use part::{
-	Effect, EnginePoint, Faction, Gun, GunPoint, ImpactInheritVelocity, Outfit, OutfitSpace,
-	Projectile, ProjectileCollider, Relationship, RepeatMode, Ship, Sprite, System,
-};
+pub use part::*;
 
 mod syntax {
 	use anyhow::{bail, Context, Result};

crates/content/src/part/gun.rs

@@ -48,8 +48,10 @@ pub enum ProjectileCollider {
 	Ball(BallCollider),
 }
 
+/// A simple ball-shaped collider, centered at the object's position
 #[derive(Debug, Deserialize, Clone)]
 pub struct BallCollider {
+	/// The radius of this ball
 	pub radius: f32,
 }
 

crates/content/src/part/mod.rs

@@ -1,19 +1,22 @@
 //! Content parts
 
-pub mod effect;
-pub mod faction;
-pub mod gun;
-pub mod outfit;
-pub mod outfitspace;
-pub mod ship;
-pub mod sprite;
-pub mod system;
+pub(crate) mod effect;
+pub(crate) mod faction;
+pub(crate) mod gun;
+pub(crate) mod outfit;
+pub(crate) mod outfitspace;
+pub(crate) mod ship;
+pub(crate) mod sprite;
+pub(crate) mod system;
 
 pub use effect::{Effect, ImpactInheritVelocity};
 pub use faction::{Faction, Relationship};
 pub use gun::{Gun, Projectile, ProjectileCollider};
 pub use outfit::Outfit;
 pub use outfitspace::OutfitSpace;
-pub use ship::{EnginePoint, GunPoint, Ship};
+pub use ship::{
+	CollapseEffectSpawner, CollapseEvent, EffectCollapseEvent, EnginePoint, GunPoint, Ship,
+	ShipCollapse,
+};
 pub use sprite::{RepeatMode, Sprite};
 pub use system::{Object, System};

crates/content/src/part/ship.rs

@@ -1,13 +1,13 @@
 use std::collections::HashMap;
 
-use anyhow::{bail, Result};
+use anyhow::{bail, Context, Result};
 use cgmath::Point2;
 use nalgebra::{point, Point};
 
-use crate::{handle::SpriteHandle, Content, ContentBuildContext, OutfitSpace};
+use crate::{handle::SpriteHandle, Content, ContentBuildContext, EffectHandle, OutfitSpace};
 
 pub(crate) mod syntax {
-	use crate::part::outfitspace;
+	use crate::part::{effect::syntax::EffectReference, outfitspace};
 	use serde::Deserialize;
 
 	// Raw serde syntax structs.
@@ -25,6 +25,7 @@ pub(crate) mod syntax {
 		pub angular_drag: f32,
 		pub linear_drag: f32,
 		pub space: outfitspace::syntax::OutfitSpace,
+		pub collapse: Option<Collapse>,
 	}
 
 	#[derive(Debug, Deserialize)]
@@ -39,6 +40,34 @@ pub(crate) mod syntax {
 		pub x: f32,
 		pub y: f32,
 	}
+
+	// TODO:
+	// plural or not? document!
+	#[derive(Debug, Deserialize)]
+	pub struct Collapse {
+		pub length: f32,
+		pub effects: Vec<CollapseEffectSpawner>,
+		pub event: Vec<CollapseEvent>,
+	}
+
+	#[derive(Debug, Deserialize)]
+	pub struct CollapseEffectSpawner {
+		pub effect: EffectReference,
+		pub count: f32,
+		pub pos: Option<[f32; 2]>,
+	}
+
+	#[derive(Debug, Deserialize)]
+	#[serde(untagged)]
+	pub enum CollapseEvent {
+		Effect(EffectCollapseEvent),
+	}
+
+	#[derive(Debug, Deserialize)]
+	pub struct EffectCollapseEvent {
+		pub time: f32,
+		pub effects: Vec<CollapseEffectSpawner>,
+	}
 }
 
 // Processed data structs.
@@ -86,6 +115,9 @@ pub struct Ship {
 
 	/// Outfit space in this ship
 	pub space: OutfitSpace,
+
+	/// Ship collapse sequence
+	pub collapse: ShipCollapse,
 }
 
 /// Collision shape for this ship
@@ -116,16 +148,60 @@ pub struct GunPoint {
 	pub pos: Point2<f32>,
 }
 
+/// Parameters for a ship's collapse sequence
+#[derive(Debug, Clone)]
+pub struct ShipCollapse {
+	/// Collapse sequence length, in seconds
+	pub length: f32,
+
+	/// Effects to create during collapse
+	pub effects: Vec<CollapseEffectSpawner>,
+
+	/// Scripted events during ship collapse
+	pub events: Vec<CollapseEvent>,
+}
+
+/// A scripted event during a ship collapse sequence
+#[derive(Debug, Clone)]
+pub struct CollapseEffectSpawner {
+	/// The effect to create
+	pub effect: EffectHandle,
+
+	/// How many effects to create
+	pub count: f32,
+
+	/// Where to create these effects.
+	/// Position is random if None.
+	pub pos: Option<Point2<f32>>,
+}
+
+/// A scripted event during a ship collapse sequence
+#[derive(Debug, Clone)]
+pub enum CollapseEvent {
+	/// A scripted effect during a ship collapse sequence
+	Effect(EffectCollapseEvent),
+}
+
+/// A scripted effect during a ship collapse sequence
+#[derive(Debug, Clone)]
+pub struct EffectCollapseEvent {
+	/// When to trigger this event
+	pub time: f32,
+
+	/// The effect to create
+	pub effects: Vec<CollapseEffectSpawner>,
+}
+
 impl crate::Build for Ship {
 	type InputSyntaxType = HashMap<String, syntax::Ship>;
 
 	fn build(
 		ship: Self::InputSyntaxType,
-		_build_context: &mut ContentBuildContext,
-		content: &mut Content,
+		build_context: &mut ContentBuildContext,
+		ct: &mut Content,
 	) -> Result<()> {
 		for (ship_name, ship) in ship {
-			let handle = match content.sprite_index.get(&ship.sprite) {
+			let handle = match ct.sprite_index.get(&ship.sprite) {
 				None => bail!(
 					"In ship `{}`: sprite `{}` doesn't exist",
 					ship_name,
@@ -135,10 +211,67 @@ impl crate::Build for Ship {
 			};
 
 			let size = ship.size;
-			let aspect = content.get_sprite(handle).aspect;
+			let aspect = ct.get_sprite(handle).aspect;
 
-			content.ships.push(Self {
+			let collapse = if let Some(c) = ship.collapse {
+				let mut effects = Vec::new();
+				for e in c.effects {
+					effects.push(CollapseEffectSpawner {
+						effect: e
+							.effect
+							.to_handle(build_context, ct)
+							.with_context(|| format!("while loading ship `{}`", ship_name))?,
+						count: e.count,
+						pos: e.pos.map(|p| Point2 {
+							x: p[0] * (size / 2.0) * aspect,
+							y: p[1] * size / 2.0,
+						}),
+					});
+				}
+
+				let mut events = Vec::new();
+				for e in c.event {
+					match e {
+						syntax::CollapseEvent::Effect(e) => {
+							let mut effects = Vec::new();
+							for g in e.effects {
+								effects.push(CollapseEffectSpawner {
+									effect: g.effect.to_handle(build_context, ct).with_context(
+										|| format!("while loading ship `{}`", ship_name),
+									)?,
+									count: g.count,
+									pos: g.pos.map(|p| Point2 {
+										x: p[0] * (size / 2.0) * aspect,
+										y: p[1] * size / 2.0,
+									}),
+								})
+							}
+
+							events.push(CollapseEvent::Effect(EffectCollapseEvent {
+								time: e.time,
+								effects,
+							}))
+						}
+					}
+				}
+
+				ShipCollapse {
+					length: c.length,
+					effects,
+					events,
+				}
+			} else {
+				// Default collapse sequence
+				ShipCollapse {
+					length: 0.0,
+					effects: vec![],
+					events: vec![],
+				}
+			};
+
+			ct.ships.push(Self {
 				aspect,
+				collapse,
 				name: ship_name,
 				sprite: handle,
 				mass: ship.mass,

crates/galactica/src/game.rs

@@ -41,6 +41,7 @@ impl Game {
 		o1.add(&ct, content::OutfitHandle { index: 0 });
 		o1.add_gun(&ct, content::GunHandle { index: 0 });
 		o1.add_gun(&ct, content::GunHandle { index: 0 });
+		o1.add_gun(&ct, content::GunHandle { index: 0 });
 
 		let s = object::Ship::new(
 			&ct,
@@ -57,14 +58,14 @@ impl Game {
 			// This method of specifying factions is non-deterministic,
 			// but that's ok since this is for debug.
 			// TODO: fix
-			content::FactionHandle { index: 0 },
+			content::FactionHandle { index: 1 },
 			object::OutfitSet::new(ss),
 		);
 		let h2 = physics.add_ship(&ct, s, Point2 { x: 300.0, y: 300.0 });
 
 		let mut o1 = object::OutfitSet::new(ss);
 		o1.add(&ct, content::OutfitHandle { index: 0 });
-		o1.add_gun(&ct, content::GunHandle { index: 0 });
+		//o1.add_gun(&ct, content::GunHandle { index: 0 });
 
 		let s = object::Ship::new(
 			&ct,

crates/gameobject/src/ship.rs

@@ -30,8 +30,7 @@ impl Ship {
 		}
 	}
 
-	/// Has this ship been destroyed?
-	pub fn is_destroyed(&self) -> bool {
+	pub fn is_dead(&self) -> bool {
 		self.hull <= 0.0
 	}
 
@@ -42,8 +41,10 @@ impl Ship {
 		let r = f.relationships.get(&p.faction).unwrap();
 		match r {
 			content::Relationship::Hostile => {
-				// TODO: implement death and spawning, and enable damage
-				//s.hull -= p.damage;
+				if self.is_dead() {
+					return true;
+				}
+				self.hull -= p.content.damage;
 				return true;
 			}
 			_ => return false,
@@ -51,6 +52,10 @@ impl Ship {
 	}
 
 	pub fn fire_guns(&mut self) -> Vec<(Projectile, content::GunPoint)> {
+		if self.is_dead() {
+			return vec![];
+		}
+
 		self.outfits
 			.iter_guns_points()
 			.filter(|(g, _)| g.cooldown <= 0.0)

crates/render/src/gpustate.rs

@@ -2,6 +2,7 @@ use anyhow::Result;
 use bytemuck;
 use cgmath::{Deg, EuclideanSpace, Matrix2, Matrix4, Point2, Vector3};
 use galactica_constants;
+use rand::seq::SliceRandom;
 use std::{iter, rc::Rc};
 use wgpu;
 use winit::{self, dpi::LogicalSize, window::Window};
@@ -624,6 +625,7 @@ impl GPUState {
 		);
 
 		// Write all new particles to GPU buffer
+		state.new_particles.shuffle(&mut rand::thread_rng());
 		for i in state.new_particles.iter() {
 			self.queue.write_buffer(
 				&self.vertex_buffers.particle.instances,

crates/world/src/objects/ship.rs

@@ -1,12 +1,13 @@
-use cgmath::{Deg, InnerSpace, Vector2};
-use nalgebra::vector;
+use cgmath::{Deg, EuclideanSpace, InnerSpace, Matrix2, Rad, Vector2, Zero};
+use nalgebra::{point, vector};
 
-use rapier2d::dynamics::RigidBody;
+use rand::{rngs::ThreadRng, Rng};
+use rapier2d::{dynamics::RigidBody, geometry::Collider};
 
 use crate::{util, ShipPhysicsHandle};
 use galactica_content as content;
 use galactica_gameobject as object;
-use galactica_render::ObjectSprite;
+use galactica_render::{ObjectSprite, ParticleBuilder};
 
 pub struct ShipControls {
 	pub left: bool,
@@ -26,6 +27,141 @@ impl ShipControls {
 	}
 }
 
+struct ShipCollapseSequence {
+	total_length: f32,
+	time_elapsed: f32,
+	rng: ThreadRng,
+}
+
+impl ShipCollapseSequence {
+	fn new(total_length: f32) -> Self {
+		Self {
+			total_length: total_length,
+			time_elapsed: 0.0,
+			rng: rand::thread_rng(),
+		}
+	}
+
+	fn is_done(&self) -> bool {
+		self.time_elapsed >= self.total_length
+	}
+
+	fn random_in_ship(
+		&mut self,
+		ship_content: &content::Ship,
+		collider: &Collider,
+	) -> Vector2<f32> {
+		// Pick a random point inside this ship's collider
+		let mut y = 0.0;
+		let mut x = 0.0;
+		let mut a = false;
+		while !a {
+			y = self.rng.gen_range(-1.0..=1.0) * ship_content.size / 2.0;
+			x = self.rng.gen_range(-1.0..=1.0) * ship_content.size * ship_content.sprite.aspect
+				/ 2.0;
+			a = collider.shape().contains_local_point(&point![x, y]);
+		}
+		Vector2 { x, y }
+	}
+
+	fn step(
+		&mut self,
+		ship: &object::Ship,
+		ct: &content::Content,
+		particles: &mut Vec<ParticleBuilder>,
+		rigid_body: &mut RigidBody,
+		collider: &mut Collider,
+		t: f32,
+	) {
+		let h = ship.handle;
+		let ship_content = ct.get_ship(h);
+		let ship_pos = util::rigidbody_position(rigid_body);
+		let ship_rot = util::rigidbody_rotation(rigid_body);
+		let ship_ang = ship_rot.angle(Vector2 { x: 1.0, y: 0.0 });
+
+		// The fraction of this collapse sequence that has been played
+		let frac_done = self.time_elapsed / self.total_length;
+
+		// Trigger collapse events
+		for event in &ship_content.collapse.events {
+			match event {
+				content::CollapseEvent::Effect(event) => {
+					if (event.time > self.time_elapsed && event.time <= self.time_elapsed + t)
+						|| (event.time == 0.0 && self.time_elapsed == 0.0)
+					{
+						for spawner in &event.effects {
+							let effect = ct.get_effect(spawner.effect);
+
+							for _ in 0..spawner.count as usize {
+								let pos = if let Some(pos) = spawner.pos {
+									pos.to_vec()
+								} else {
+									self.random_in_ship(ship_content, collider)
+								};
+
+								// Position, adjusted for ship rotation
+								let pos =
+									Matrix2::from_angle(-ship_ang - Rad::from(Deg(90.0))) * pos;
+
+								particles.push(ParticleBuilder {
+									sprite: effect.sprite,
+									pos: ship_pos + pos,
+									velocity: Vector2::zero(),
+									angle: Deg::zero(),
+									lifetime: effect.lifetime,
+									size: effect.size,
+								});
+							}
+						}
+					}
+				}
+			}
+		}
+
+		// Create collapse effects
+		for spawner in &ship_content.collapse.effects {
+			let effect = 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| {
+				let f = 0.2;
+				let y = if x < (1.0 - f) {
+					let x = x / (1.0 - f);
+					(x * x + 0.2) * 1.8 - f
+				} else {
+					1.0
+				};
+				return y;
+			};
+
+			let p_add = (t / self.total_length) * pdf(frac_done) * spawner.count;
+
+			if self.rng.gen_range(0.0..=1.0) <= p_add {
+				let pos = if let Some(pos) = spawner.pos {
+					pos.to_vec()
+				} else {
+					self.random_in_ship(ship_content, collider)
+				};
+
+				// Position, adjusted for ship rotation
+				let pos = Matrix2::from_angle(-ship_ang - Rad::from(Deg(90.0))) * pos;
+
+				particles.push(ParticleBuilder {
+					sprite: effect.sprite,
+					pos: ship_pos + pos,
+					velocity: Vector2::zero(),
+					angle: Deg::zero(),
+					lifetime: effect.lifetime,
+					size: effect.size,
+				});
+			}
+		}
+
+		self.time_elapsed += t;
+	}
+}
+
 /// A ship instance in the physics system
 pub struct ShipWorldObject {
 	/// This ship's physics handle
@@ -36,20 +172,46 @@ pub struct ShipWorldObject {
 
 	/// This ship's controls
 	pub controls: ShipControls,
+
+	collapse_sequence: ShipCollapseSequence,
 }
 
 impl ShipWorldObject {
 	/// Make a new ship
-	pub fn new(ship: object::Ship, physics_handle: ShipPhysicsHandle) -> Self {
+	pub fn new(
+		ct: &content::Content,
+		ship: object::Ship,
+		physics_handle: ShipPhysicsHandle,
+	) -> Self {
+		let ship_content = ct.get_ship(ship.handle);
 		ShipWorldObject {
 			physics_handle,
 			ship,
 			controls: ShipControls::new(),
+			collapse_sequence: ShipCollapseSequence::new(ship_content.collapse.length),
 		}
 	}
 
+	/// Should this ship should be removed from the world?
+	pub fn remove_from_world(&self) -> bool {
+		return self.ship.is_dead() && self.collapse_sequence.is_done();
+	}
+
 	/// Step this ship's state by t seconds
-	pub fn step(&mut self, r: &mut RigidBody, t: f32) {
+	pub fn step(
+		&mut self,
+		ct: &content::Content,
+		particles: &mut Vec<ParticleBuilder>,
+		r: &mut RigidBody,
+		c: &mut Collider,
+		t: f32,
+	) {
+		if self.ship.is_dead() {
+			return self
+				.collapse_sequence
+				.step(&self.ship, ct, particles, r, c, t);
+		}
+
 		let ship_rot = util::rigidbody_rotation(r);
 		let engine_force = ship_rot * t;
 

crates/world/src/world.rs

@@ -253,7 +253,8 @@ impl<'a> World {
 		);
 
 		let h = ShipPhysicsHandle(r, c);
-		self.ships.insert(c, objects::ShipWorldObject::new(ship, h));
+		self.ships
+			.insert(c, objects::ShipWorldObject::new(ct, ship, h));
 		return h;
 	}
 
@@ -264,16 +265,19 @@ impl<'a> World {
 		let mut projectiles = Vec::new();
 		let mut to_remove = Vec::new();
 		for (_, s) in &mut self.ships {
-			if s.ship.is_destroyed() {
-				to_remove.push(s.physics_handle);
-				continue;
-			}
-
 			let r = &mut self.wrapper.rigid_body_set[s.physics_handle.0];
-			s.step(r, t);
+			let c = &mut self.wrapper.collider_set[s.physics_handle.1];
+
+			// TODO: unified step info struct
+			s.step(ct, particles, r, c, t);
 			if s.controls.guns {
 				projectiles.push((s.physics_handle, s.ship.fire_guns()));
 			}
+
+			if s.remove_from_world() {
+				to_remove.push(s.physics_handle);
+				continue;
+			}
 		}
 		for (s, p) in projectiles {
 			self.add_projectiles(s, p);