Improved flare animation

TODO.md

@@ -1,11 +1,13 @@
 # Specific projects
 
 ## Currently working on:
- - player selection
+ - first: fix particles & physics
+ - clickable buttons
  - planet outfitter
 
 
 ## Small jobs
+- 🌟 clean up and document short sprite sections
 - 🌟 Better planet desc formatting
 - Procedural suns
 - 🌟 Back arrow -> reverse
@@ -27,7 +29,6 @@
 - Turn flares (physics by location?)
 - Angled engines & guns
 - Fix effect interaction with sprite sections
-- Clean up starfieldsprite
 
 ## Misc fixes & Optimizations
 - 🌟 Better errors when content/asset dirs don't exist

assets

@@ -1 +1 @@
-Subproject commit b4fe8111c7b1cb17987bbff095bd50e61e2d8998
+Subproject commit f749d99ae63bcdefb4a62774d21f30a7eebc20d3

content/outfits.toml

@@ -3,7 +3,9 @@
 space.engine = 20
 
 engine.thrust = 100
-engine.flare_sprite = "flare::ion"
+engine.flare.sprite = "flare::ion"
+engine.flare.on_start = "rise:top"
+engine.flare.on_stop = "rise:bot"
 steering.power = 20
 
 

crates/content/src/animautomaton.rs

@@ -66,6 +66,9 @@ pub struct AnimAutomaton {
 	/// The texture we're fading to
 	/// (if we're moving downwards)
 	next_texture: u32,
+
+	/// If this is some, take this edge next
+	next_edge_override: Option<SectionEdge>,
 }
 
 impl AnimAutomaton {
@@ -90,6 +93,7 @@ impl AnimAutomaton {
 			sprite: sprite.handle,
 			current_frame: 0,
 			current_fade: 0.0,
+			next_edge_override: None,
 
 			current_direction,
 			current_section,
@@ -98,21 +102,56 @@ impl AnimAutomaton {
 		}
 	}
 
-	/// Reset this animation
-	pub fn reset(&mut self, ct: &Content) {
-		*self = Self::new(ct, self.sprite);
+	/// Override the next section transition
+	pub fn next_edge(&mut self, s: SectionEdge) {
+		self.next_edge_override = Some(s);
 	}
 
-	/// Reverse this animation's direction
-	pub fn reverse(&mut self) {
-		match self.current_direction {
-			AnimDirection::Stop => {}
-			AnimDirection::Up => {
+	/// Force a transition to the given section right now
+	pub fn jump_to(&mut self, ct: &Content, start: StartEdge) {
+		self.take_edge(ct, start.into());
+	}
+
+	fn take_edge(&mut self, ct: &Content, e: SectionEdge) {
+		let sprite = ct.get_sprite(self.sprite);
+		let current_section = sprite.get_section(self.current_section);
+
+		match e {
+			SectionEdge::Stop => {
+				self.current_fade = 0.0;
+				self.current_frame = current_section.frames.len() - 1;
+				self.current_direction = AnimDirection::Stop;
+			}
+			SectionEdge::Top { section } => {
+				self.current_section = section;
+				self.current_frame = 0;
 				self.current_direction = AnimDirection::Down;
 			}
-			AnimDirection::Down => {
+			SectionEdge::Bot { section } => {
+				let s = sprite.get_section(section);
+				self.current_section = section;
+				self.current_frame = s.frames.len() - 1;
 				self.current_direction = AnimDirection::Up;
 			}
+			SectionEdge::Restart => {
+				self.current_frame = 0;
+			}
+			SectionEdge::Reverse => {
+				// Jump to SECOND frame, since we've already shown the
+				// first during the fade transition
+
+				match self.current_direction {
+					AnimDirection::Stop => {}
+					AnimDirection::Up => {
+						self.current_frame = 0;
+						self.current_direction = AnimDirection::Down;
+					}
+					AnimDirection::Down => {
+						self.current_frame = current_section.frames.len() - 1;
+						self.current_direction = AnimDirection::Up;
+					}
+				}
+			}
 		}
 	}
 
@@ -129,15 +168,21 @@ impl AnimAutomaton {
 		// and we switch to the next frame when it hits 1.0. If we are stepping foward, it increases,
 		// and if we are stepping backwards, it decreases.
 
-		// If this is zero, this section isn't animated.
-		if current_section.frame_duration == 0.0 {
-			return;
-		}
+		// This should always be positive, and this fact is enforced by the content loader.
+		// if we get here, something is very wrong.
+		assert!(current_section.frame_duration > 0.0);
 
 		match self.current_direction {
 			AnimDirection::Down => self.current_fade += t / current_section.frame_duration,
 			AnimDirection::Up => self.current_fade -= t / current_section.frame_duration,
-			AnimDirection::Stop => {}
+			AnimDirection::Stop => {
+				// Edge case: we're stopped and got a request to transition.
+				// we should transition right away.
+
+				if let Some(e) = self.next_edge_override {
+					self.take_edge(ct, e);
+				}
+			}
 		}
 
 		// We're stepping foward and finished this frame
@@ -150,32 +195,14 @@ impl AnimAutomaton {
 			if self.current_frame < current_section.frames.len() - 1 {
 				self.current_frame += 1;
 			} else {
-				match current_section.edge_bot {
-					SectionEdge::Stop => {
-						self.current_fade = 0.0;
-						self.current_frame = current_section.frames.len() - 1;
-						self.current_direction = AnimDirection::Stop;
+				let e = {
+					if self.next_edge_override.is_some() {
+						self.next_edge_override.take().unwrap()
+					} else {
+						current_section.edge_bot.clone()
 					}
-					SectionEdge::Top { section } => {
-						self.current_section = section;
-						self.current_frame = 0;
-					}
-					SectionEdge::Bot { section } => {
-						let s = sprite.get_section(section);
-						self.current_section = section;
-						self.current_frame = s.frames.len() - 1;
-						self.reverse();
-					}
-					SectionEdge::Restart => {
-						self.current_frame = 0;
-					}
-					SectionEdge::Reverse => {
-						// Jump to SECOND frame, since we've already shown the
-						// first during the fade transition
-						self.current_frame = current_section.frames.len() - 1;
-						self.reverse()
-					}
-				}
+				};
+				self.take_edge(ct, e);
 			}
 
 			let current_section = sprite.get_section(self.current_section);
@@ -193,30 +220,14 @@ impl AnimAutomaton {
 			if self.current_frame > 0 {
 				self.current_frame -= 1;
 			} else {
-				match current_section.edge_top {
-					SectionEdge::Stop => {
-						self.current_fade = 0.0;
-						self.current_frame = 0;
-						self.current_direction = AnimDirection::Stop;
+				let e = {
+					if self.next_edge_override.is_some() {
+						self.next_edge_override.take().unwrap()
+					} else {
+						current_section.edge_top.clone()
 					}
-					SectionEdge::Top { section } => {
-						self.current_section = section;
-						self.current_frame = 0;
-						self.reverse();
-					}
-					SectionEdge::Bot { section } => {
-						let s = sprite.get_section(section);
-						self.current_section = section;
-						self.current_frame = s.frames.len() - 1;
-					}
-					SectionEdge::Reverse => {
-						self.current_frame = 0;
-						self.reverse();
-					}
-					SectionEdge::Restart => {
-						self.current_frame = current_section.frames.len() - 1;
-					}
-				}
+				};
+				self.take_edge(ct, e);
 			}
 
 			let current_section = sprite.get_section(self.current_section);

crates/content/src/handle.rs

@@ -8,25 +8,9 @@
 use std::{cmp::Eq, hash::Hash};
 
 /// A lightweight representation of a sprite
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub struct SpriteHandle {
 	pub(crate) index: usize,
-
-	/// The aspect ratio of this sprite (width / height)
-	pub aspect: f32,
-}
-
-impl Hash for SpriteHandle {
-	fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
-		self.index.hash(state)
-	}
-}
-
-impl Eq for SpriteHandle {}
-impl PartialEq for SpriteHandle {
-	fn eq(&self, other: &Self) -> bool {
-		self.index.eq(&other.index)
-	}
 }
 
 /// A lightweight representation of system body

crates/content/src/lib.rs

@@ -13,6 +13,7 @@ use galactica_packer::{SpriteAtlas, SpriteAtlasImage};
 use std::{
 	collections::HashMap,
 	fs::File,
+	hash::Hash,
 	io::Read,
 	path::{Path, PathBuf},
 };
@@ -122,13 +123,18 @@ trait Build {
 /// Stores temporary data while building context objects
 #[derive(Debug)]
 pub(crate) struct ContentBuildContext {
+	/// Map effect names to handles
 	pub effect_index: HashMap<String, EffectHandle>,
+
+	/// Maps sprite handles to a map of section name -> section index
+	pub sprite_section_index: HashMap<SpriteHandle, HashMap<String, AnimSectionHandle>>,
 }
 
 impl ContentBuildContext {
 	fn new() -> Self {
 		Self {
 			effect_index: HashMap::new(),
+			sprite_section_index: HashMap::new(),
 		}
 	}
 }

crates/content/src/part/outfit.rs

@@ -1,13 +1,14 @@
-use anyhow::{bail, Context, Result};
+use anyhow::{anyhow, Context, Result};
 use serde::Deserialize;
 use std::collections::HashMap;
 
 use crate::{
 	handle::SpriteHandle, Content, ContentBuildContext, EffectHandle, OutfitHandle, OutfitSpace,
+	StartEdge,
 };
 
 pub(crate) mod syntax {
-	use crate::{effect, part::outfitspace, ContentBuildContext};
+	use crate::{effect, part::outfitspace, sprite::syntax::SectionEdge, ContentBuildContext};
 	use anyhow::{bail, Result};
 	use galactica_util::to_radians;
 	use serde::Deserialize;
@@ -34,7 +35,14 @@ pub(crate) mod syntax {
 	#[derive(Debug, Deserialize)]
 	pub struct Engine {
 		pub thrust: f32,
-		pub flare_sprite: String,
+		pub flare: EngineFlare,
+	}
+
+	#[derive(Debug, Deserialize)]
+	pub struct EngineFlare {
+		pub sprite: String,
+		pub on_start: Option<SectionEdge>,
+		pub on_stop: Option<SectionEdge>,
 	}
 
 	#[derive(Debug, Deserialize)]
@@ -139,6 +147,12 @@ pub struct Outfit {
 	/// engine points.
 	pub engine_flare_sprite: Option<SpriteHandle>,
 
+	/// Jump to this edge when engines turn on
+	pub engine_flare_on_start: Option<StartEdge>,
+
+	/// Jump to this edge when engines turn off
+	pub engine_flare_on_stop: Option<StartEdge>,
+
 	/// Shield hit points
 	pub shield_strength: f32,
 
@@ -253,6 +267,8 @@ impl crate::Build for Outfit {
 				engine_thrust: 0.0,
 				steer_power: 0.0,
 				engine_flare_sprite: None,
+				engine_flare_on_start: None,
+				engine_flare_on_stop: None,
 				space: OutfitSpace::from(outfit.space),
 				shield_delay: 0.0,
 				shield_generation: 0.0,
@@ -261,16 +277,44 @@ impl crate::Build for Outfit {
 
 			// Engine stats
 			if let Some(engine) = outfit.engine {
-				let th = match content.sprite_index.get(&engine.flare_sprite) {
-					None => bail!(
-						"In outfit `{}`: flare sprite `{}` doesn't exist",
-						outfit_name,
-						engine.flare_sprite
-					),
+				let sprite_handle = match content.sprite_index.get(&engine.flare.sprite) {
+					None => {
+						return Err(anyhow!(
+							"flare sprite `{}` doesn't exist",
+							engine.flare.sprite
+						))
+						.with_context(|| format!("in outfit `{}`", outfit_name));
+					}
 					Some(t) => *t,
 				};
 				o.engine_thrust = engine.thrust;
-				o.engine_flare_sprite = Some(th);
+				o.engine_flare_sprite = Some(sprite_handle);
+
+				o.engine_flare_on_start = {
+					let x = engine.flare.on_start;
+					if x.is_none() {
+						None
+					} else {
+						let x = x.unwrap();
+						Some(
+							x.resolve_as_start(sprite_handle, build_context)
+								.with_context(|| format!("in outfit `{}`", outfit_name))?,
+						)
+					}
+				};
+
+				o.engine_flare_on_stop = {
+					let x = engine.flare.on_stop;
+					if x.is_none() {
+						None
+					} else {
+						let x = x.unwrap();
+						Some(
+							x.resolve_as_start(sprite_handle, build_context)
+								.with_context(|| format!("in outfit `{}`", outfit_name))?,
+						)
+					}
+				};
 			}
 
 			// Steering stats

crates/content/src/part/sprite.rs

@@ -4,13 +4,11 @@ use std::collections::HashMap;
 use crate::{handle::SpriteHandle, Content, ContentBuildContext};
 
 pub(crate) mod syntax {
-	use crate::{Content, ContentBuildContext};
+	use crate::{Content, ContentBuildContext, SpriteHandle};
 	use anyhow::{anyhow, bail, Context, Ok, Result};
 	use serde::Deserialize;
 	use std::{collections::HashMap, path::PathBuf};
 
-	use super::AnimSectionHandle;
-
 	// Raw serde syntax structs.
 	// These are never seen by code outside this crate.
 
@@ -66,12 +64,9 @@ pub(crate) mod syntax {
 	impl SpriteSection {
 		pub fn add_to(
 			&self,
-			_build_context: &mut ContentBuildContext,
+			this_sprite: SpriteHandle,
+			build_context: &mut ContentBuildContext,
 			content: &mut Content,
-
-			// An index of all sections in this sprite, used to resolve
-			// top and bot edges.
-			all_sections: &HashMap<String, AnimSectionHandle>,
 		) -> Result<((u32, u32), super::SpriteSection)> {
 			// Make sure all frames have the same size and add them
 			// to the frame vector
@@ -109,12 +104,12 @@ pub(crate) mod syntax {
 			}
 
 			let edge_top = match &self.top {
-				Some(x) => x.resolve_as_edge(all_sections)?,
+				Some(x) => x.resolve_as_edge(this_sprite, build_context)?,
 				None => super::SectionEdge::Stop,
 			};
 
 			let edge_bot = match &self.bot {
-				Some(x) => x.resolve_as_edge(all_sections)?,
+				Some(x) => x.resolve_as_edge(this_sprite, build_context)?,
 				None => super::SectionEdge::Stop,
 			};
 
@@ -140,10 +135,11 @@ pub(crate) mod syntax {
 	impl SectionEdge {
 		pub fn resolve_as_start(
 			&self,
-			all_sections: &HashMap<String, AnimSectionHandle>,
+			sprite: SpriteHandle,
+			build_context: &ContentBuildContext,
 		) -> Result<super::StartEdge> {
 			let e = self
-				.resolve_as_edge(all_sections)
+				.resolve_as_edge(sprite, build_context)
 				.with_context(|| format!("while resolving start edge"))?;
 			match e {
 				super::SectionEdge::Bot { section } => Ok(super::StartEdge::Bot { section }),
@@ -156,8 +152,11 @@ pub(crate) mod syntax {
 
 		pub fn resolve_as_edge(
 			&self,
-			all_sections: &HashMap<String, AnimSectionHandle>,
+			sprite: SpriteHandle,
+			build_context: &ContentBuildContext,
 		) -> Result<super::SectionEdge> {
+			let all_sections = build_context.sprite_section_index.get(&sprite).unwrap();
+
 			if self.val == "stop" {
 				return Ok(super::SectionEdge::Stop);
 			}
@@ -203,7 +202,7 @@ pub(crate) mod syntax {
 pub struct AnimSectionHandle(pub(crate) usize);
 
 /// An edge between two animation sections
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy)]
 pub enum SectionEdge {
 	/// Stop at the last frame of this section
 	Stop,
@@ -228,7 +227,7 @@ pub enum SectionEdge {
 }
 
 /// Where to start an animation
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, Copy)]
 pub enum StartEdge {
 	/// Play the given section from the bottm
 	Bot {
@@ -243,6 +242,15 @@ pub enum StartEdge {
 	},
 }
 
+impl Into<SectionEdge> for StartEdge {
+	fn into(self) -> SectionEdge {
+		match self {
+			Self::Bot { section } => SectionEdge::Bot { section },
+			Self::Top { section } => SectionEdge::Top { section },
+		}
+	}
+}
+
 /// Represents a sprite that may be used in the game.
 #[derive(Debug, Clone)]
 pub struct Sprite {
@@ -276,6 +284,14 @@ impl Sprite {
 		}
 	}
 
+	/// Get this sprite's starting section
+	pub fn get_start_section(&self) -> AnimSectionHandle {
+		match self.start_at {
+			StartEdge::Bot { section } => section,
+			StartEdge::Top { section } => section,
+		}
+	}
+
 	/// Iterate this sprite's sections
 	pub fn iter_sections(&self) -> impl Iterator<Item = &SpriteSection> {
 		self.sections.iter()
@@ -330,10 +346,12 @@ impl crate::Build for Sprite {
 
 					let h = SpriteHandle {
 						index: content.sprites.len(),
-						aspect,
 					};
 
 					content.sprite_index.insert(sprite_name.clone(), h);
+					let mut smap = HashMap::new();
+					smap.insert("anim".to_string(), AnimSectionHandle(0));
+					build_context.sprite_section_index.insert(h, smap);
 
 					content.sprites.push(Self {
 						name: sprite_name,
@@ -357,26 +375,33 @@ impl crate::Build for Sprite {
 					// Name the one section in this sprite "anim"
 					section_names.insert("anim".to_owned(), AnimSectionHandle(0));
 
+					let sprite_handle = SpriteHandle {
+						index: content.sprites.len(),
+					};
+					content
+						.sprite_index
+						.insert(sprite_name.clone(), sprite_handle);
+					let mut smap = HashMap::new();
+					smap.insert("anim".to_string(), AnimSectionHandle(0));
+					build_context
+						.sprite_section_index
+						.insert(sprite_handle, smap);
+
 					let (dim, section) = s
-						.add_to(build_context, content, &section_names)
+						.add_to(sprite_handle, build_context, content)
 						.with_context(|| format!("while parsing sprite `{}`", sprite_name))?;
 					let aspect = dim.0 as f32 / dim.1 as f32;
-					let h = SpriteHandle {
-						index: content.sprites.len(),
-						aspect,
-					};
 
 					let mut sections = Vec::new();
 					sections.push(section);
 
-					content.sprite_index.insert(sprite_name.clone(), h);
 					content.sprites.push(Self {
 						name: sprite_name,
 						sections,
 						start_at: StartEdge::Bot {
 							section: AnimSectionHandle(0),
 						},
-						handle: h,
+						handle: sprite_handle,
 						aspect,
 					});
 				}
@@ -388,9 +413,19 @@ impl crate::Build for Sprite {
 						idx += 1;
 					}
 
+					let sprite_handle = SpriteHandle {
+						index: content.sprites.len(),
+					};
+					content
+						.sprite_index
+						.insert(sprite_name.clone(), sprite_handle);
+					build_context
+						.sprite_section_index
+						.insert(sprite_handle, section_names.clone());
+
 					let start_at = s
 						.start_at
-						.resolve_as_start(&section_names)
+						.resolve_as_start(sprite_handle, build_context)
 						.with_context(|| format!("while loading sprite `{}`", sprite_name))?;
 
 					let mut sections = Vec::with_capacity(idx);
@@ -403,7 +438,7 @@ impl crate::Build for Sprite {
 					for (k, _) in names {
 						let v = s.section.get(k).unwrap();
 						let (d, s) = v
-							.add_to(build_context, content, &section_names)
+							.add_to(sprite_handle, build_context, content)
 							.with_context(|| format!("while parsing sprite `{}`", sprite_name))
 							.with_context(|| format!("while parsing section `{}`", k))?;
 
@@ -423,17 +458,11 @@ impl crate::Build for Sprite {
 					let dim = dim.unwrap();
 					let aspect = dim.0 as f32 / dim.1 as f32;
 
-					let h = SpriteHandle {
-						index: content.sprites.len(),
-						aspect,
-					};
-
-					content.sprite_index.insert(sprite_name.clone(), h);
 					content.sprites.push(Self {
 						name: sprite_name,
 						sections,
 						start_at,
-						handle: h,
+						handle: sprite_handle,
 						aspect,
 					});
 				}

crates/render/src/gpustate/new.rs

@@ -39,6 +39,7 @@ impl GPUState {
 			(device, queue) = adapter
 				.request_device(
 					&wgpu::DeviceDescriptor {
+						// TODO: remove nonuniform sampled textures
 						features: wgpu::Features::TEXTURE_BINDING_ARRAY | wgpu::Features::SAMPLED_TEXTURE_AND_STORAGE_BUFFER_ARRAY_NON_UNIFORM_INDEXING,
 						// We may need limits if we compile for wasm
 						limits: wgpu::Limits::default(),

crates/render/src/gpustate/phys.rs

@@ -12,11 +12,11 @@ use crate::{
 impl GPUState {
 	pub(super) fn phys_push_ship(
 		&mut self,
-		state: &RenderInput,
+		input: &RenderInput,
 		// NE and SW corners of screen
 		screen_clip: (Point2<f32>, Point2<f32>),
 	) {
-		for ship in state.systemsim.iter_ships() {
+		for ship in input.systemsim.iter_ships() {
 			// TODO: move collapse sequence here?
 
 			let ship_pos;
@@ -26,21 +26,21 @@ impl GPUState {
 				ShipState::Dead | ShipState::Landed { .. } => continue,
 
 				ShipState::Collapsing { .. } | ShipState::Flying { .. } => {
-					let r = state.systemsim.get_rigid_body(ship.rigid_body).unwrap();
+					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 = state.ct.get_ship(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 = state.systemsim.get_rigid_body(ship.rigid_body).unwrap();
+					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 = state.ct.get_ship(ship.get_data().get_content());
+					ship_cnt = input.ct.get_ship(ship.get_data().get_content());
 				}
 			}
 
@@ -48,14 +48,15 @@ impl GPUState {
 			// TODO: adjust parallax for zoom?
 			// 1.0 is z-coordinate, which is constant for ships
 			let pos: Point2<f32> =
-				(Point2::new(ship_pos.x, ship_pos.y) - state.camera_pos) / ship_pos.z;
+				(Point2::new(ship_pos.x, ship_pos.y) - input.camera_pos) / ship_pos.z;
 
 			// 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 = (ship_cnt.size / ship_pos.z) * ship_cnt.sprite.aspect.max(1.0);
+			let m =
+				(ship_cnt.size / ship_pos.z) * input.ct.get_sprite(ship_cnt.sprite).aspect.max(1.0);
 
 			// Don't draw sprites that are off the screen
 			if pos.x < screen_clip.0.x - m
@@ -98,7 +99,7 @@ impl GPUState {
 					| ShipState::Landing { .. } => true,
 					_ => false,
 				};
-				ship.get_controls().thrust && is_flying
+				is_flying
 			} {
 				for (engine_point, anim) in ship.iter_engine_anim() {
 					self.state.queue.write_buffer(
@@ -136,12 +137,12 @@ impl GPUState {
 
 	pub(super) fn phys_push_projectile(
 		&mut self,
-		state: &RenderInput,
+		input: &RenderInput,
 		// NE and SW corners of screen
 		screen_clip: (Point2<f32>, Point2<f32>),
 	) {
-		for p in state.systemsim.iter_projectiles() {
-			let r = state.systemsim.get_rigid_body(p.rigid_body).unwrap();
+		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();
@@ -150,14 +151,14 @@ impl GPUState {
 			// Position adjusted for parallax
 			// TODO: adjust parallax for zoom?
 			// 1.0 is z-coordinate, which is constant for projectiles
-			let pos = (proj_pos - state.camera_pos) / 1.0;
+			let pos = (proj_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 = (proj_cnt.size / 1.0) * proj_cnt.sprite.aspect.max(1.0);
+			let m = (proj_cnt.size / 1.0) * input.ct.get_sprite(proj_cnt.sprite).aspect.max(1.0);
 
 			// Don't draw sprites that are off the screen
 			if pos.x < screen_clip.0.x - m
@@ -196,22 +197,22 @@ impl GPUState {
 
 	pub(super) fn phys_push_system(
 		&mut self,
-		state: &RenderInput,
+		input: &RenderInput,
 		// NE and SW corners of screen
 		screen_clip: (Point2<f32>, Point2<f32>),
 	) {
-		let system = state.ct.get_system(state.current_system);
+		let system = input.ct.get_system(input.current_system);
 
 		for o in &system.objects {
 			// Position adjusted for parallax
-			let pos: Point2<f32> = (Point2::new(o.pos.x, o.pos.y) - state.camera_pos) / o.pos.z;
+			let pos: Point2<f32> = (Point2::new(o.pos.x, o.pos.y) - input.camera_pos) / o.pos.z;
 
 			// 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 = (o.size / o.pos.z) * o.sprite.aspect.max(1.0);
+			let m = (o.size / o.pos.z) * input.ct.get_sprite(o.sprite).aspect.max(1.0);
 
 			// Don't draw sprites that are off the screen
 			if pos.x < screen_clip.0.x - m
@@ -239,7 +240,7 @@ impl GPUState {
 				}]),
 			);
 
-			let sprite = state.ct.get_sprite(o.sprite);
+			let sprite = input.ct.get_sprite(o.sprite);
 			let texture_a = sprite.get_first_frame(); // ANIMATE
 
 			// Push this object's instance

crates/render/src/ui/planet.rs

@@ -53,6 +53,7 @@ impl Planet {
 			current_object: None,
 
 			planet_desc: UiTextArea::new(
+				ct,
 				state,
 				ct.get_sprite_handle("ui::planet"),
 				Point2::new(0.0, 0.0),
@@ -67,6 +68,7 @@ impl Planet {
 			),
 
 			planet_name: UiTextArea::new(
+				ct,
 				state,
 				ct.get_sprite_handle("ui::planet"),
 				Point2::new(0.0, 0.0),
@@ -135,10 +137,10 @@ impl Planet {
 		self.sprite.push_to_buffer(input, state);
 	}
 
-	pub fn get_textarea(&self, _input: &RenderInput, state: &RenderState) -> [TextArea; 2] {
+	pub fn get_textarea(&self, input: &RenderInput, state: &RenderState) -> [TextArea; 2] {
 		[
-			self.planet_desc.get_textarea(state),
-			self.planet_name.get_textarea(state),
+			self.planet_desc.get_textarea(input, state),
+			self.planet_name.get_textarea(input, state),
 		]
 	}
 }

crates/render/src/ui/radar.rs

@@ -133,7 +133,7 @@ impl Radar {
 					([c[0], c[1], c[2], 1.0], 1.0)
 				}
 			};
-			let size = (ship.size * ship.sprite.aspect) * ship_scale * z_scale;
+			let size = (ship.size * input.ct.get_sprite(ship.sprite).aspect) * ship_scale * z_scale;
 			let p: Point2<f32> = {
 				if s.collider == input.player.ship.unwrap() {
 					self.last_player_position

crates/render/src/ui/util/sprite.rs

@@ -38,7 +38,10 @@ impl UiSprite {
 	/// Add this image to the gpu sprite buffer
 	pub fn push_to_buffer(&self, input: &RenderInput, state: &mut RenderState) {
 		let pos = Point2::new(self.rect.pos.x, self.rect.pos.y);
-		let dim = Vector2::new(self.rect.dim.y * self.sprite.aspect, self.rect.dim.y);
+		let dim = Vector2::new(
+			self.rect.dim.y * input.ct.get_sprite(self.sprite).aspect,
+			self.rect.dim.y,
+		);
 
 		for c in &self.children_under {
 			c.push_to_buffer_child(input, state, pos, dim);

crates/render/src/ui/util/textarea.rs

@@ -1,9 +1,9 @@
-use galactica_content::SpriteHandle;
+use galactica_content::{Content, SpriteHandle};
 use glyphon::{cosmic_text::Align, Attrs, Buffer, Color, Metrics, Shaping, TextArea, TextBounds};
 use nalgebra::{Point2, Vector2};
 
 use super::SpriteRect;
-use crate::RenderState;
+use crate::{RenderInput, RenderState};
 
 /// Represents a text area inside a sprite.
 pub(crate) struct UiTextArea {
@@ -32,6 +32,7 @@ pub(crate) struct UiTextArea {
 
 impl UiTextArea {
 	pub fn new(
+		ct: &Content,
 		state: &mut RenderState,
 		sprite: SpriteHandle,
 		sprite_position: Point2<f32>,
@@ -50,16 +51,16 @@ impl UiTextArea {
 			align,
 			color,
 		};
-		s.set_size(state, sprite_size);
+		s.set_size(ct, state, sprite_size);
 		return s;
 	}
 
-	pub fn set_size(&mut self, state: &mut RenderState, sprite_size: f32) {
+	pub fn set_size(&mut self, ct: &Content, state: &mut RenderState, sprite_size: f32) {
 		self.sprite_size = sprite_size;
 		self.buffer.set_size(
 			&mut state.text_font_system,
 			(self.rect.dim.x * self.sprite_size) * state.window.scale_factor() as f32,
-			(self.rect.dim.y * self.sprite_size * self.sprite.aspect)
+			(self.rect.dim.y * self.sprite_size * ct.get_sprite(self.sprite).aspect)
 				* state.window.scale_factor() as f32,
 		);
 	}
@@ -74,9 +75,9 @@ impl UiTextArea {
 		self.buffer.shape_until_scroll(&mut state.text_font_system);
 	}
 
-	pub fn get_textarea(&self, state: &RenderState) -> TextArea {
+	pub fn get_textarea(&self, input: &RenderInput, state: &RenderState) -> TextArea {
 		let h = self.sprite_size;
-		let w = self.sprite.aspect * h;
+		let w = input.ct.get_sprite(self.sprite).aspect * h;
 
 		// Glypon works with physical pixels, so we must convert
 		let fac = state.window.scale_factor() as f32;

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

@@ -1,4 +1,4 @@
-use galactica_content::{CollapseEvent, Ship};
+use galactica_content::{CollapseEvent, Content, Ship};
 use nalgebra::{Point2, Vector2};
 use rand::{rngs::ThreadRng, Rng};
 use rapier2d::{dynamics::RigidBody, geometry::Collider};
@@ -32,13 +32,14 @@ impl ShipCollapseSequence {
 	}
 
 	/// Pick a random points inside a ship's collider
-	fn random_in_ship(&mut self, ship: &Ship, collider: &Collider) -> Vector2<f32> {
+	fn random_in_ship(&mut self, ct: &Content, ship: &Ship, collider: &Collider) -> Vector2<f32> {
 		let mut y = 0.0;
 		let mut x = 0.0;
 		let mut a = false;
 		while !a {
 			x = self.rng.gen_range(-1.0..=1.0) * ship.size / 2.0;
-			y = self.rng.gen_range(-1.0..=1.0) * ship.size * ship.sprite.aspect / 2.0;
+			y = self.rng.gen_range(-1.0..=1.0) * ship.size * ct.get_sprite(ship.sprite).aspect
+				/ 2.0;
 			a = collider.shape().contains_local_point(&Point2::new(x, y));
 		}
 		Vector2::new(x, y)
@@ -76,7 +77,7 @@ impl ShipCollapseSequence {
 								let pos: Vector2<f32> = if let Some(pos) = spawner.pos {
 									Vector2::new(pos.x, pos.y)
 								} else {
-									self.random_in_ship(ship_content, collider)
+									self.random_in_ship(res.ct, ship_content, collider)
 								};
 								let pos = ship_pos + (ship_rot * pos);
 
@@ -120,7 +121,7 @@ impl ShipCollapseSequence {
 				let pos = if let Some(pos) = spawner.pos {
 					Vector2::new(pos.x, pos.y)
 				} else {
-					self.random_in_ship(ship_content, collider)
+					self.random_in_ship(res.ct, ship_content, collider)
 				};
 
 				// Position, adjusted for ship rotation

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

@@ -64,6 +64,9 @@ pub struct PhysSimShip {
 	/// 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>,
 }
@@ -86,6 +89,7 @@ impl PhysSimShip {
 			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)),
 		}
 	}
@@ -100,14 +104,32 @@ impl PhysSimShip {
 		self.data.step(res.t);
 		self.anim.step(res.ct, res.t);
 
-		if self.controls.thrust {
-			for (_, e) in &mut self.engine_anim {
-				e.step(res.ct, res.t);
-			}
-		} else {
-			for (_, e) in &mut self.engine_anim {
-				e.reset(res.ct);
-			}
+		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.next_edge(flare.engine_flare_on_stop.unwrap().into());
+					}
+				}
+			};
+		} 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.next_edge(flare.engine_flare_on_start.unwrap().into());
+					}
+				}
+			};
 		}
 
 		match self.data.get_state() {
@@ -133,6 +155,8 @@ impl PhysSimShip {
 
 			ShipState::Dead | ShipState::Landed { .. } => {}
 		}
+
+		self.last_controls = self.controls.clone();
 	}
 
 	/// Update this frame's physics
@@ -196,7 +220,7 @@ impl PhysSimShip {
 						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 * ship_content.sprite.aspect
+								* ship_content.size * res.ct.get_sprite(ship_content.sprite).aspect
 								/ 2.0;
 							a = collider.shape().contains_local_point(&point![x, y]);
 						}
@@ -221,25 +245,30 @@ impl PhysSimShip {
 
 /// Public mutable
 impl PhysSimShip {
-	/// Re-create this ship's engine flare animations
-	/// Should be called whenever we change outfits
-	fn update_flares(&mut self, ct: &Content) {
+	fn get_flare(&mut self, ct: &Content) -> Option<OutfitHandle> {
 		// TODO: better way to pick flare sprite
-		let mut flare = None;
 		for (h, _) in self.data.get_outfits().iter_outfits() {
 			let c = ct.get_outfit(*h);
 			if c.engine_flare_sprite.is_some() {
-				flare = c.engine_flare_sprite;
-				break;
+				return Some(*h);
 			}
 		}
+		return None;
+	}
 
-		if flare.is_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();
 
-		let flare = flare.unwrap();
 		self.engine_anim = ct
 			.get_ship(self.data.get_content())
 			.engines