diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..732295e
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,260 @@
+#![feature(gen_blocks)]
+
+use std::{convert::identity, error::Error, f32::consts::PI};
+
+use glam::{Mat4, UVec2, Vec3, uvec2, vec3};
+
+use crate::{
+	camera::OrbitalCamera,
+	render::lines::{LookParams, Mesh, Pipeline, Vertex},
+	trace::{Scene, Source, Sphere},
+};
+
+mod camera;
+mod ray;
+mod render;
+mod trace;
+
+const OUTPUT_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8UnormSrgb;
+
+pub struct Gpu {
+	device: wgpu::Device,
+	queue: wgpu::Queue,
+	surface: wgpu::Surface<'static>,
+}
+
+pub struct Core {
+	device: wgpu::Device,
+	queue: wgpu::Queue,
+	surface: wgpu::Surface<'static>,
+
+	pipeline: Pipeline,
+	tripod: Mesh,
+}
+
+pub fn new_tripod(device: &wgpu::Device) -> Mesh {
+	Mesh::new(
+		device,
+		&[
+			Vertex::new(vec3(0., 0., 0.), vec3(1., 0., 0.)),
+			Vertex::new(vec3(1., 0., 0.), vec3(1., 0., 0.)),
+			Vertex::new(vec3(0., 0., 0.), vec3(0., 1., 0.)),
+			Vertex::new(vec3(0., 1., 0.), vec3(0., 1., 0.)),
+			Vertex::new(vec3(0., 0., 0.), vec3(0., 0., 1.)),
+			Vertex::new(vec3(0., 0., 1.), vec3(0., 0., 1.)),
+		],
+	)
+}
+
+fn loop_list<T: Clone>(iter: impl IntoIterator<Item = T>) -> impl Iterator<Item = T> {
+	loop_list_ex(iter, identity, identity)
+}
+
+fn loop_list_ex<T: Clone, U>(
+	iter: impl IntoIterator<Item = T>,
+	mut fa: impl FnMut(T) -> U,
+	mut fb: impl FnMut(T) -> U,
+) -> impl Iterator<Item = U> {
+	gen move {
+		let mut iter = iter.into_iter();
+		let Some(first) = iter.next() else { return };
+		yield fa(first.clone());
+		for item in iter {
+			yield fb(item.clone());
+			yield fa(item);
+		}
+		yield fb(first);
+	}
+}
+
+impl Core {
+	pub fn new(gpu: Gpu) -> Self {
+		let Gpu {
+			device,
+			queue,
+			surface,
+		} = gpu;
+
+		let pipeline = Pipeline::new(&device, OUTPUT_FORMAT);
+		let tripod = new_tripod(&device);
+		queue.submit([]); // flush buffer updates
+
+		let mut this = Self {
+			device,
+			queue,
+			surface,
+			pipeline,
+			tripod,
+		};
+		this.configure(uvec2(1, 1)); // ensure we always have a valid surface to work with
+		this
+	}
+
+	fn render(&self, output: &wgpu::Texture) {
+		let camera = OrbitalCamera {
+			position_yaw: PI / 4.,
+			position_pitch: 0.5f32.sqrt().atan(),
+			distance: 3.0,
+		};
+		let aspect = {
+			let size = output.size();
+			let w = size.width as f32;
+			let h = size.height as f32;
+			w / h
+		};
+		let perspective = Mat4::perspective_lh(PI / 3., aspect, 1e-2, 1e2);
+		self.pipeline.set_look(
+			&self.queue,
+			LookParams {
+				m: perspective * camera.transform(),
+			},
+		);
+		self.queue.submit([]); // flush buffer updates
+
+		let view = output.create_view(&wgpu::TextureViewDescriptor::default());
+		let mut encoder = self
+			.device
+			.create_command_encoder(&wgpu::CommandEncoderDescriptor::default());
+		let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+			color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+				view: &view,
+				depth_slice: None,
+				resolve_target: None,
+				ops: wgpu::Operations {
+					load: wgpu::LoadOp::Clear(wgpu::Color {
+						r: 0.1,
+						g: 0.2,
+						b: 0.8,
+						a: 1.0,
+					}),
+					store: wgpu::StoreOp::Store,
+				},
+			})],
+			depth_stencil_attachment: None,
+			..Default::default()
+		});
+		self.pipeline.render(&mut pass, [&self.tripod]);
+
+		let source = Source {
+			position_yaw: 0.0,
+			position_pitch: PI / 3.,
+			distance: 1.0,
+			radius: 0.125,
+			spread: 0.125,
+		};
+
+		let contour: Vec<Vertex> = loop_list(source.contour(17))
+			.map(|pos| Vertex {
+				pos,
+				color: vec3(1., 1., 1.),
+			})
+			.collect();
+		self.pipeline
+			.render(&mut pass, [&Mesh::new(&self.device, &contour)]);
+
+		const BASE_R: f32 = 2.;
+		const BASE_POS: Vec3 = vec3(0., 0., -BASE_R);
+		const BASE: Sphere = Sphere {
+			position: vec3(0., 0., -BASE_R),
+			radius: BASE_R,
+		};
+		fn sphere(pos: Vec3) -> Sphere {
+			Sphere {
+				position: pos,
+				radius: BASE_POS.distance(pos) - BASE_R,
+			}
+		}
+		let scene = Scene {
+			objects: vec![
+				BASE,
+				sphere(vec3(0., 0., 0.1)),
+				sphere(vec3(0.3, 0., 0.1)),
+				sphere(vec3(0.1, 0.3, 0.1)),
+			],
+		};
+
+		let mut prng = rand_pcg::Pcg64::new(42, 0);
+		let rays: Vec<Vertex> = (0..10000)
+			.flat_map(|_| {
+				let ray = source.make_ray(&mut prng);
+				if let Some(ray) = scene.trace_ray(ray) {
+					[
+						Vertex {
+							pos: ray.base - 0.02 * ray.dir,
+							color: vec3(1., 1., 1.),
+						},
+						Vertex {
+							pos: ray.base,
+							color: vec3(0., 1., 0.),
+						},
+					]
+				} else {
+					[
+						Vertex {
+							pos: ray.base,
+							color: vec3(1., 1., 1.),
+						},
+						Vertex {
+							pos: ray.base + 0.1 * ray.dir,
+							color: vec3(1., 0., 0.),
+						},
+					]
+				}
+			})
+			.collect();
+		self.pipeline
+			.render(&mut pass, [&Mesh::new(&self.device, &rays)]);
+
+		drop(pass);
+		self.queue.submit(std::iter::once(encoder.finish()));
+	}
+
+	pub fn configure(&mut self, pixel_size: UVec2) {
+		self.surface.configure(
+			&self.device,
+			&wgpu::SurfaceConfiguration {
+				usage: wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::COPY_DST,
+				format: OUTPUT_FORMAT,
+				width: pixel_size.x,
+				height: pixel_size.y,
+				present_mode: wgpu::PresentMode::Fifo,
+				alpha_mode: wgpu::CompositeAlphaMode::Auto,
+				view_formats: vec![],
+				desired_maximum_frame_latency: 2,
+			},
+		);
+	}
+
+	pub fn redraw(&mut self) {
+		let output = self.surface.get_current_texture().unwrap();
+		self.render(&output.texture);
+		output.present();
+	}
+}
+
+pub async fn init_gpu_inner<E: Error + 'static>(
+	make_surface: impl FnOnce(&wgpu::Instance) -> Result<wgpu::Surface<'static>, E>,
+) -> Result<Gpu, Box<dyn Error>> {
+	let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor {
+		backends: wgpu::Backends::PRIMARY,
+		..Default::default()
+	});
+	let surface = make_surface(&instance)?;
+	let adapter = instance
+		.request_adapter(&wgpu::RequestAdapterOptions {
+			power_preference: wgpu::PowerPreference::default(),
+			compatible_surface: Some(&surface),
+			force_fallback_adapter: false,
+		})
+		.await
+		.unwrap();
+	let (device, queue) = adapter
+		.request_device(&wgpu::DeviceDescriptor::default())
+		.await
+		.unwrap();
+	Ok(Gpu {
+		device,
+		queue,
+		surface,
+	})
+}
diff --git a/src/main.rs b/src/main.rs
index 4491e80..e32b546 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,8 +1,7 @@
-#![feature(gen_blocks)]
+use std::sync::Arc;
 
-use std::{convert::identity, error::Error, f32::consts::PI, sync::Arc};
-
-use glam::{Mat4, Vec3, vec3};
+use glam::uvec2;
+use photon_light::{Core, init_gpu_inner};
 use winit::{
 	application::ApplicationHandler,
 	event::WindowEvent,
@@ -10,236 +9,34 @@ use winit::{
 	window::Window,
 };
 
-use crate::{
-	camera::OrbitalCamera,
-	render::lines::{LookParams, Mesh, Pipeline, Vertex},
-	trace::{Scene, Source, Sphere},
-};
-
-mod camera;
-mod ray;
-mod render;
-mod trace;
-
 const TITLE: &str = "WGPU example";
-const OUTPUT_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Bgra8UnormSrgb;
 
 struct MainWindow {
-	handle: Arc<Window>,
-	device: wgpu::Device,
-	queue: wgpu::Queue,
-	surface: wgpu::Surface<'static>,
-	surface_configured: bool,
-
-	pipeline: Pipeline,
-	tripod: Mesh,
-}
-
-pub fn new_tripod(device: &wgpu::Device) -> Mesh {
-	Mesh::new(
-		device,
-		&[
-			Vertex::new(vec3(0., 0., 0.), vec3(1., 0., 0.)),
-			Vertex::new(vec3(1., 0., 0.), vec3(1., 0., 0.)),
-			Vertex::new(vec3(0., 0., 0.), vec3(0., 1., 0.)),
-			Vertex::new(vec3(0., 1., 0.), vec3(0., 1., 0.)),
-			Vertex::new(vec3(0., 0., 0.), vec3(0., 0., 1.)),
-			Vertex::new(vec3(0., 0., 1.), vec3(0., 0., 1.)),
-		],
-	)
-}
-
-fn loop_list<T: Clone>(iter: impl IntoIterator<Item = T>) -> impl Iterator<Item = T> {
-	loop_list_ex(iter, identity, identity)
-}
-
-fn loop_list_ex<T: Clone, U>(
-	iter: impl IntoIterator<Item = T>,
-	mut fa: impl FnMut(T) -> U,
-	mut fb: impl FnMut(T) -> U,
-) -> impl Iterator<Item = U> {
-	gen move {
-		let mut iter = iter.into_iter();
-		let Some(first) = iter.next() else { return };
-		yield fa(first.clone());
-		for item in iter {
-			yield fb(item.clone());
-			yield fa(item);
-		}
-		yield fb(first);
-	}
+	window: Arc<Window>,
+	core: Core,
 }
 
 impl MainWindow {
 	fn new(event_loop: &ActiveEventLoop) -> Self {
-		let handle = event_loop
+		let window = event_loop
 			.create_window(Window::default_attributes().with_title(TITLE))
 			.unwrap();
-		let handle = Arc::new(handle);
-
-		let (device, queue, surface) = pollster::block_on(init_gpu(Arc::clone(&handle))).unwrap();
-		let pipeline = Pipeline::new(&device, OUTPUT_FORMAT);
-		let tripod = new_tripod(&device);
-		queue.submit([]); // flush buffer updates
-
-		Self {
-			handle,
-			device,
-			queue,
-			surface,
-			surface_configured: false,
-			pipeline,
-			tripod,
-		}
-	}
-
-	fn render(&self, output: &wgpu::Texture) {
-		let camera = OrbitalCamera {
-			position_yaw: PI / 4.,
-			position_pitch: 0.5f32.sqrt().atan(),
-			distance: 3.0,
-		};
-		let aspect = {
-			let size = output.size();
-			let w = size.width as f32;
-			let h = size.height as f32;
-			w / h
-		};
-		let perspective = Mat4::perspective_lh(PI / 3., aspect, 1e-2, 1e2);
-		self.pipeline.set_look(
-			&self.queue,
-			LookParams {
-				m: perspective * camera.transform(),
-			},
-		);
-		self.queue.submit([]); // flush buffer updates
-
-		let view = output.create_view(&wgpu::TextureViewDescriptor::default());
-		let mut encoder = self
-			.device
-			.create_command_encoder(&wgpu::CommandEncoderDescriptor::default());
-		let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
-			color_attachments: &[Some(wgpu::RenderPassColorAttachment {
-				view: &view,
-				depth_slice: None,
-				resolve_target: None,
-				ops: wgpu::Operations {
-					load: wgpu::LoadOp::Clear(wgpu::Color {
-						r: 0.1,
-						g: 0.2,
-						b: 0.8,
-						a: 1.0,
-					}),
-					store: wgpu::StoreOp::Store,
-				},
-			})],
-			depth_stencil_attachment: None,
-			..Default::default()
-		});
-		self.pipeline.render(&mut pass, [&self.tripod]);
-
-		let source = Source {
-			position_yaw: 0.0,
-			position_pitch: PI / 3.,
-			distance: 1.0,
-			radius: 0.125,
-			spread: 0.125,
-		};
-
-		let contour: Vec<Vertex> = loop_list(source.contour(17))
-			.map(|pos| Vertex {
-				pos,
-				color: vec3(1., 1., 1.),
-			})
-			.collect();
-		self.pipeline
-			.render(&mut pass, [&Mesh::new(&self.device, &contour)]);
-
-		const BASE_R: f32 = 2.;
-		const BASE_POS: Vec3 = vec3(0., 0., -BASE_R);
-		const BASE: Sphere = Sphere {
-			position: vec3(0., 0., -BASE_R),
-			radius: BASE_R,
-		};
-		fn sphere(pos: Vec3) -> Sphere {
-			Sphere {
-				position: pos,
-				radius: BASE_POS.distance(pos) - BASE_R,
-			}
-		}
-		let scene = Scene {
-			objects: vec![
-				BASE,
-				sphere(vec3(0., 0., 0.1)),
-				sphere(vec3(0.3, 0., 0.1)),
-				sphere(vec3(0.1, 0.3, 0.1)),
-			],
-		};
-
-		let mut prng = rand_pcg::Pcg64::new(42, 0);
-		let rays: Vec<Vertex> = (0..10000)
-			.flat_map(|_| {
-				let ray = source.make_ray(&mut prng);
-				if let Some(ray) = scene.trace_ray(ray) {
-					[
-						Vertex {
-							pos: ray.base - 0.02 * ray.dir,
-							color: vec3(1., 1., 1.),
-						},
-						Vertex {
-							pos: ray.base,
-							color: vec3(0., 1., 0.),
-						},
-					]
-				} else {
-					[
-						Vertex {
-							pos: ray.base,
-							color: vec3(1., 1., 1.),
-						},
-						Vertex {
-							pos: ray.base + 0.1 * ray.dir,
-							color: vec3(1., 0., 0.),
-						},
-					]
-				}
-			})
-			.collect();
-		self.pipeline
-			.render(&mut pass, [&Mesh::new(&self.device, &rays)]);
-
-		drop(pass);
-		self.queue.submit(std::iter::once(encoder.finish()));
+		let window = Arc::new(window);
+		let gpu = pollster::block_on(init_gpu_inner(|instance| {
+			instance.create_surface(Arc::clone(&window))
+		}))
+		.unwrap();
+		let core = Core::new(gpu);
+		Self { window, core }
 	}
 
 	fn event(&mut self, event_loop: &ActiveEventLoop, event: WindowEvent) {
 		match event {
 			WindowEvent::CloseRequested => event_loop.exit(),
-			WindowEvent::Resized(physical_size) => {
-				self.surface.configure(
-					&self.device,
-					&wgpu::SurfaceConfiguration {
-						usage: wgpu::TextureUsages::RENDER_ATTACHMENT
-							| wgpu::TextureUsages::COPY_DST,
-						format: OUTPUT_FORMAT,
-						width: physical_size.width,
-						height: physical_size.height,
-						present_mode: wgpu::PresentMode::Fifo,
-						alpha_mode: wgpu::CompositeAlphaMode::Auto,
-						view_formats: vec![],
-						desired_maximum_frame_latency: 2,
-					},
-				);
-				self.surface_configured = true;
-			}
-			WindowEvent::RedrawRequested => {
-				if !self.surface_configured {
-					return;
-				}
-				let output = self.surface.get_current_texture().unwrap();
-				self.render(&output.texture);
-				output.present();
-			}
+			WindowEvent::Resized(physical_size) => self
+				.core
+				.configure(uvec2(physical_size.width, physical_size.height)),
+			WindowEvent::RedrawRequested => self.core.redraw(),
 			_ => {}
 		}
 	}
@@ -270,34 +67,11 @@ impl ApplicationHandler for Application {
 			.main_window
 			.as_mut()
 			.expect("window must exist to recieve events");
-		assert_eq!(window.handle.id(), window_id);
+		assert_eq!(window.window.id(), window_id);
 		window.event(event_loop, event);
 	}
 }
 
-async fn init_gpu<'window>(
-	wnd: impl wgpu::WindowHandle + 'window,
-) -> Result<(wgpu::Device, wgpu::Queue, wgpu::Surface<'window>), Box<dyn Error>> {
-	let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor {
-		backends: wgpu::Backends::PRIMARY,
-		..Default::default()
-	});
-	let surface = instance.create_surface(wnd)?;
-	let adapter = instance
-		.request_adapter(&wgpu::RequestAdapterOptions {
-			power_preference: wgpu::PowerPreference::default(),
-			compatible_surface: Some(&surface),
-			force_fallback_adapter: false,
-		})
-		.await
-		.unwrap();
-	let (device, queue) = adapter
-		.request_device(&wgpu::DeviceDescriptor::default())
-		.await
-		.unwrap();
-	Ok((device, queue, surface))
-}
-
 fn main() {
 	let event_loop = EventLoop::new().unwrap();
 	event_loop.set_control_flow(ControlFlow::Wait);