A whole lot of garbage

Cargo.toml

@@ -0,0 +1,6 @@
+[workspace]
+resolver = "3"
+members = ["app","rendering", "terrain"]
+
+[profile.dev.package."*"]
+opt-level = 3

app/.gitignore

@@ -0,0 +1 @@
+/target

app/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "voxtech"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+# voxtech_terrain = { path = "../terrain" }
+# voxtech_rendering = { path = "../rendering" }
+
+tracing-subscriber = "0.3.23"
+tracing = { version = "0.1.44", features = ["log"] }
+
+bevy = { version = "0.19.0-rc.2", features = ["dynamic_linking"] }

app/src/main.rs

@@ -0,0 +1,62 @@
+use std::range::Range;
+
+use bevy::{
+    DefaultPlugins,
+    asset::io::embedded::GetAssetServer,
+    core_pipeline::core_3d::*,
+    ecs::{component::Component, query::*, system::SystemParamItem},
+    mesh::Mesh3d,
+    pbr::{SetMeshBindGroup, SetMeshViewBindGroup, SetMeshViewEmptyBindGroup},
+    prelude::*,
+    render::{
+        RenderSystems::Queue,
+        render_phase::*,
+        render_resource::*,
+        settings::{Backends, RenderCreation, WgpuSettings},
+        *,
+    },
+};
+
+fn main() -> AppExit {
+    let mut app = App::default();
+    app.add_plugins(DefaultPlugins.set(RenderPlugin {
+        render_creation: RenderCreation::Automatic(Box::new(WgpuSettings {
+            backends: Some(Backends::VULKAN | Backends::GL),
+            ..Default::default()
+        })),
+        ..Default::default()
+    }));
+    app.add_systems(Startup, setup);
+
+    app.run()
+}
+
+/// set up a simple 3D scene
+fn setup(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+) {
+    // circular base
+    commands.spawn((
+        Mesh3d(meshes.add(Circle::new(4.0))),
+        MeshMaterial3d(materials.add(Color::WHITE)),
+        Transform::from_rotation(Quat::from_rotation_x(-std::f32::consts::FRAC_PI_2)),
+    ));
+    // cube
+    commands.spawn((
+        Mesh3d(meshes.add(Cuboid::new(1.0, 1.0, 1.0))),
+        MeshMaterial3d(materials.add(Color::srgb_u8(124, 144, 255))),
+        Transform::from_xyz(0.0, 0.5, 0.0),
+    ));
+    // light
+    commands.spawn((
+        PointLight { ..default() },
+        Transform::from_xyz(4.0, 8.0, 4.0),
+    ));
+    // camera
+    commands.spawn((
+        Camera3d::default(),
+        Transform::from_xyz(-2.5, 4.5, 9.0).looking_at(Vec3::ZERO, Vec3::Y),
+    ));
+}

rendering/.gitignore

@@ -0,0 +1 @@
+/target

rendering/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "voxtech_rendering"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+voxtech_terrain = { path = "../terrain" }
+
+bytemuck = "1.25.0"
+glam = "0.33.0"
+modular-bitfield = "0.13.1"
+pollster = "0.4.0"
+tracing = "0.1.44"
+wgpu = { version = "29.0.3", default-features = false, features = ["vulkan", "std", "wgsl", "webgpu"] }
+winit = "0.30.13"
+
+bevy_ecs = "0.18.1"
+bevy_app = "0.18.1"
+rayon = "1.12.0"
+crossbeam = "0.8.4"
+rangemap = "1.7.1"

rendering/src/chunk/mesh_gen.rs

@@ -0,0 +1,220 @@
+use bevy_app::{App, Plugin, PostUpdate};
+use bevy_ecs::{
+    component::Component,
+    entity::Entity,
+    query::{With, Without},
+    resource::Resource,
+    schedule::IntoScheduleConfigs,
+    system::{Commands, Query, Res, ResMut},
+};
+use crossbeam::channel::{Receiver, Sender};
+use std::{ops::Range, sync::Arc, thread::JoinHandle, time::Instant};
+use tracing::debug;
+use voxtech_terrain::chunk::{ChunkData, SIZE, UnsafeChunkData};
+
+use crate::{
+    chunk::renderer::{ChunkRenderer, Face, FaceColour, FaceDirection},
+    plugin::RenderPluginState,
+};
+
+#[derive(Debug, Component)]
+pub(crate) struct ChunkMesh {
+    range: Range<usize>,
+    last_update: Instant,
+}
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Component)]
+pub(crate) struct ChunkMeshDirty;
+
+pub(crate) struct ChunkMesher {
+    pub thread_count: usize,
+}
+
+impl Plugin for ChunkMesher {
+    fn build(&self, app: &mut App) {
+        app.insert_resource(ChunkMesherState::new(self.thread_count));
+        app.add_systems(PostUpdate, tag_not_meshed);
+        app.add_systems(PostUpdate, schedule_dirty.after(tag_not_meshed));
+        app.add_systems(PostUpdate, submit_meshed.after(schedule_dirty));
+    }
+
+    fn cleanup(&self, app: &mut App) {
+        app.world_mut().remove_resource::<ChunkMesherState>();
+    }
+}
+
+struct MeshRequest {
+    time: Instant,
+    entity: Entity,
+    voxels: Box<UnsafeChunkData>,
+}
+
+struct MeshResult {
+    time: Instant,
+    entity: Entity,
+    faces: Vec<Face>,
+}
+
+#[derive(Resource)]
+struct ChunkMesherState {
+    sender: Sender<MeshRequest>,
+    receiver: Receiver<MeshResult>,
+    threads: Vec<JoinHandle<()>>,
+}
+
+impl ChunkMesherState {
+    pub fn new(thread_count: usize) -> Self {
+        let (request_sender, request_receiver) = crossbeam::channel::unbounded();
+        let request_receiver = Arc::new(request_receiver);
+
+        let (result_sender, result_receiver) = crossbeam::channel::unbounded();
+        let result_sender = Arc::new(result_sender);
+
+        let mut threads = Vec::with_capacity(thread_count);
+
+        for _ in 0..thread_count {
+            let sender = result_sender.clone();
+            let receiver = request_receiver.clone();
+            threads.push(std::thread::spawn(move || {
+                loop {
+                    let Ok(MeshRequest {
+                        time,
+                        entity,
+                        voxels,
+                    }) = receiver.recv()
+                    else {
+                        return;
+                    };
+
+                    debug!("Meshing {entity:?}...");
+                    let now = Instant::now();
+                    let mut faces = vec![];
+                    generate_chunk_mesh::<{ FaceDirection::Front as usize }>(&voxels, &mut faces);
+
+                    let elapsed = now.elapsed();
+                    debug!("Meshed {entity:?} in {:?} ({} faces)", elapsed, faces.len());
+
+                    if !sender
+                        .send(MeshResult {
+                            time,
+                            entity,
+                            faces,
+                        })
+                        .is_ok()
+                    {
+                        return;
+                    }
+                }
+            }));
+        }
+        Self {
+            sender: request_sender,
+            receiver: result_receiver,
+            threads,
+        }
+    }
+}
+
+fn tag_not_meshed(
+    mut commands: Commands,
+    query: Query<Entity, (With<ChunkData>, Without<ChunkMesh>)>,
+) {
+    for entity in query.iter() {
+        commands.entity(entity).insert((
+            ChunkMeshDirty,
+            ChunkMesh {
+                range: 0..0,
+                last_update: Instant::now(),
+            },
+        ));
+    }
+}
+
+fn schedule_dirty(
+    mut commands: Commands,
+    state: Res<ChunkMesherState>,
+    query: Query<(Entity, &mut ChunkData), With<ChunkMeshDirty>>,
+) {
+    for (entity, data) in query.iter() {
+        let now = Instant::now();
+        unsafe {
+            let data = data.as_unsafe();
+            let mut copy = Box::<UnsafeChunkData>::new_uninit();
+            std::ptr::copy(data, copy.as_mut_ptr(), 1);
+            state
+                .sender
+                .send(MeshRequest {
+                    time: Instant::now(),
+                    entity,
+                    voxels: copy.assume_init(),
+                })
+                .unwrap();
+            commands.entity(entity).remove::<ChunkMeshDirty>();
+        }
+        let elapsed = now.elapsed();
+        debug!("Created snapshot of {entity:?} in {:?}", elapsed);
+    }
+}
+
+fn submit_meshed(mut commands: Commands, state: Res<ChunkMesherState>) {
+    if state.receiver.is_empty() {
+        return;
+    }
+
+    // let mut world = plugin_state.world.lock().unwrap();
+    // let Some(mut renderer) = world.get_resource_mut::<ChunkRenderer>() else {
+    //     return;
+    // };
+
+    // for MeshResult {
+    //     time,
+    //     entity,
+    //     faces,
+    // } in state.receiver.try_iter()
+    // {
+    //     commands.entity(entity).insert(ChunkMesh {
+    //         last_update: time,
+    //         range: renderer.set_mesh(entity, faces),
+    //     });
+    // }
+}
+
+#[inline]
+const fn rotate_indices<const FACE: usize>([x, y, z]: [usize; 3]) -> [usize; 3] {
+    const TOP: usize = FaceDirection::Top as usize;
+    const BOTTOM: usize = FaceDirection::Bottom as usize;
+    const LEFT: usize = FaceDirection::Left as usize;
+    const RIGHT: usize = FaceDirection::Right as usize;
+    const FRONT: usize = FaceDirection::Front as usize;
+    const BACK: usize = FaceDirection::Back as usize;
+    match FACE {
+        TOP => todo!(),
+        BOTTOM => todo!(),
+        LEFT => todo!(),
+        RIGHT => todo!(),
+        FRONT => [x, y, z],
+        BACK => todo!(),
+        _ => unreachable!(),
+    }
+}
+
+fn generate_chunk_mesh<const FACE: usize>(voxels: &UnsafeChunkData, faces: &mut Vec<Face>) {
+    for z in 0..SIZE {
+        for y in 0..SIZE {
+            for x in 0..SIZE {
+                if voxels[rotate_indices::<FACE>([x, y, z])] == 0 {
+                    continue;
+                }
+                if z != 0 && voxels[rotate_indices::<FACE>([x, y, z - 1])] != 0 {
+                    continue;
+                }
+                faces.push(
+                    Face::new()
+                        .with_x(x as _)
+                        .with_y(y as _)
+                        .with_colour(FaceColour::new().with_r(255)),
+                );
+            }
+        }
+    }
+}

rendering/src/chunk/mod.rs

@@ -0,0 +1,2 @@
+pub mod mesh_gen;
+pub mod renderer;

rendering/src/chunk/renderer.rs

@@ -0,0 +1,283 @@
+use std::{ops::Range, sync::Arc};
+
+use crate::state::{FrameResources, RenderState};
+use bevy_ecs::{
+    entity::Entity,
+    resource::Resource,
+    system::{Res, ResMut},
+};
+use bytemuck::{Pod, Zeroable};
+use modular_bitfield::{Specifier, bitfield, specifiers::*};
+use rangemap::RangeSet;
+use tracing::error;
+use voxtech_terrain::chunk::ChunkId;
+use wgpu::{
+    naga::FastHashMap,
+    util::{BufferInitDescriptor, DeviceExt, RenderEncoder},
+    *,
+};
+
+#[derive(Specifier, Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[bits = 3]
+pub enum FaceDirection {
+    Top,
+    Bottom,
+    Left,
+    Right,
+    Front,
+    Back,
+}
+
+#[bitfield]
+#[derive(Specifier, Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub struct FaceColour {
+    pub r: u8,
+    pub g: u8,
+    pub b: u8,
+    pub a: u8,
+}
+
+#[repr(C)]
+#[bitfield]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Zeroable, Pod)]
+pub struct Face {
+    pub face: FaceDirection,
+    pub x: B5,
+    pub y: B5,
+    pub z: B5,
+    pub w: B5,
+    pub h: B5,
+    pub meta: B4,
+    pub colour: FaceColour,
+}
+
+#[repr(C)]
+#[derive(Debug, Clone, Copy, Zeroable, Pod)]
+pub struct Vertex {
+    pub position: [f32; 2],
+}
+
+impl Vertex {
+    pub fn square() -> [Self; 4] {
+        [
+            Self {
+                position: [0.0, 1.0],
+            },
+            Self {
+                position: [0.0, 0.0],
+            },
+            Self {
+                position: [1.0, 1.0],
+            },
+            Self {
+                position: [1.0, 0.0],
+            },
+        ]
+    }
+
+    pub fn pipeline(device: &Device, surface_config: &SurfaceConfiguration) -> RenderPipeline {
+        let bind_group_layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            label: None,
+            entries: &[BindGroupLayoutEntry {
+                binding: 0,
+                visibility: ShaderStages::VERTEX_FRAGMENT,
+                ty: BindingType::Buffer {
+                    ty: BufferBindingType::Storage { read_only: true },
+                    has_dynamic_offset: false,
+                    min_binding_size: None,
+                },
+                count: None,
+            }],
+        });
+        let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: None,
+            bind_group_layouts: &[Some(&bind_group_layout)],
+            immediate_size: 0,
+        });
+
+        let shader = device.create_shader_module(wgpu::include_wgsl!("shader.wgsl"));
+
+        let vertex_buffers = [wgpu::VertexBufferLayout {
+            array_stride: size_of::<Self>() as wgpu::BufferAddress,
+            step_mode: wgpu::VertexStepMode::Vertex,
+            attributes: &[wgpu::VertexAttribute {
+                format: wgpu::VertexFormat::Float32x2,
+                offset: 0,
+                shader_location: 0,
+            }],
+        }];
+
+        device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+            label: Some("chunk_renderer"),
+            layout: Some(&pipeline_layout),
+            vertex: wgpu::VertexState {
+                module: &shader,
+                entry_point: Some("vs_main"),
+                compilation_options: Default::default(),
+                buffers: &vertex_buffers,
+            },
+            fragment: Some(wgpu::FragmentState {
+                module: &shader,
+                entry_point: Some("fs_main"),
+                compilation_options: Default::default(),
+                targets: &[
+                    Some(surface_config.view_formats[0].into()),
+                    Some(TextureFormat::R32Uint.into()),
+                ],
+            }),
+            primitive: wgpu::PrimitiveState {
+                cull_mode: Some(wgpu::Face::Back),
+                topology: PrimitiveTopology::TriangleStrip,
+                ..Default::default()
+            },
+            depth_stencil: None,
+            multisample: wgpu::MultisampleState::default(),
+            multiview_mask: None,
+            cache: None,
+        })
+    }
+}
+
+#[derive(Resource)]
+pub struct ChunkRenderer {
+    vertex_buffer: Buffer,
+    face_buffer: Arc<Buffer>,
+    bind_group: BindGroup,
+    pipeline: RenderPipeline,
+    id_texture: Texture,
+    free: RangeSet<usize>,
+    used: FastHashMap<ChunkId, Range<usize>>,
+    writes: Vec<(Range<u64>, Vec<Face>)>,
+}
+
+impl ChunkRenderer {
+    pub fn new(device: &Device, surface_config: &SurfaceConfiguration) -> Self {
+        const MAX_FACE_COUNT: usize = 100000;
+        let vertex_data = Vertex::square();
+        let pipeline = Vertex::pipeline(device, surface_config);
+        let vertex_buffer = device.create_buffer_init(&BufferInitDescriptor {
+            label: Some("Vertex Buffer"),
+            contents: bytemuck::cast_slice(&vertex_data),
+            usage: BufferUsages::VERTEX,
+        });
+        let face_buffer = device.create_buffer(&BufferDescriptor {
+            label: Some("Face Buffer"),
+            size: (MAX_FACE_COUNT * size_of::<Face>()) as u64,
+            mapped_at_creation: false,
+            usage: BufferUsages::STORAGE | BufferUsages::COPY_DST,
+        });
+        let bind_group = device.create_bind_group(&BindGroupDescriptor {
+            label: Some("Chunk bindings"),
+            layout: &pipeline.get_bind_group_layout(0),
+            entries: &[BindGroupEntry {
+                binding: 0,
+                resource: BindingResource::Buffer(BufferBinding {
+                    buffer: &face_buffer,
+                    offset: 0,
+                    size: None,
+                }),
+            }],
+        });
+
+        Self {
+            vertex_buffer,
+            face_buffer: face_buffer.into(),
+            pipeline,
+            bind_group,
+            id_texture: device.create_texture(&TextureDescriptor {
+                label: Some("Chunk visibility texture"),
+                size: Extent3d {
+                    width: surface_config.width,
+                    height: surface_config.height,
+                    depth_or_array_layers: 1,
+                },
+                mip_level_count: 1,
+                sample_count: 1,
+                dimension: TextureDimension::D2,
+                format: TextureFormat::R32Uint,
+                usage: TextureUsages::RENDER_ATTACHMENT,
+                view_formats: &[],
+            }),
+            free: RangeSet::from_iter([0..MAX_FACE_COUNT]),
+            used: FastHashMap::default(),
+            writes: vec![],
+        }
+    }
+
+    pub fn set_mesh(&mut self, chunk: ChunkId, faces: Vec<Face>) -> Range<usize> {
+        for range in self.free.iter() {
+            if range.len() >= faces.len() {
+                let mut range = range.clone();
+                range.end = range.start + faces.len();
+                self.free.remove(range.clone());
+                self.used.entry(chunk).insert(range.clone());
+
+                let bounds = (range.start * size_of::<Face>()) as u64
+                    ..(range.end * size_of::<Face>()) as u64;
+
+                self.writes.push((bounds, faces));
+                return range;
+            }
+        }
+        error!(
+            "Could not find a suitable buffer range for entity {chunk:?}. The chunk will not be rendered."
+        );
+        if let Some(range) = self.used.remove(&chunk) {
+            self.free.insert(range);
+        }
+        0..0
+    }
+
+    pub(crate) fn render(
+        mut renderer: ResMut<ChunkRenderer>,
+        state: Res<RenderState>,
+        mut frame: ResMut<FrameResources>,
+    ) {
+        for (range, faces) in std::mem::take(&mut renderer.writes) {
+            state.queue.write_buffer(
+                &renderer.face_buffer,
+                range.start,
+                bytemuck::cast_slice(&faces),
+            );
+        }
+
+        let view = frame.screen_view.clone();
+        let mut pass = frame
+            .command_encoder
+            .begin_render_pass(&RenderPassDescriptor {
+                label: Some("Render triangle"),
+                color_attachments: &[
+                    Some(RenderPassColorAttachment {
+                        view: &view,
+                        depth_slice: None,
+                        resolve_target: None,
+                        ops: Operations {
+                            load: LoadOp::DontCare(LoadOpDontCare::default()),
+                            store: StoreOp::Store,
+                        },
+                    }),
+                    Some(RenderPassColorAttachment {
+                        view: &renderer
+                            .id_texture
+                            .create_view(&TextureViewDescriptor::default()),
+                        depth_slice: None,
+                        resolve_target: None,
+                        ops: Operations {
+                            load: LoadOp::DontCare(LoadOpDontCare::default()),
+                            store: StoreOp::Store,
+                        },
+                    }),
+                ],
+                depth_stencil_attachment: None,
+                timestamp_writes: None,
+                occlusion_query_set: None,
+                multiview_mask: None,
+            });
+        pass.set_bind_group(0, &renderer.bind_group, &[]);
+        pass.set_pipeline(&renderer.pipeline);
+        pass.set_vertex_buffer(0, renderer.vertex_buffer.slice(..));
+        for range in renderer.used.values() {
+            pass.draw(0..4, range.start as u32..range.end as u32);
+        }
+    }
+}

rendering/src/chunk/shader.wgsl

@@ -0,0 +1,61 @@
+enable draw_index;
+
+struct VertexInput {
+    @location(0) position: vec2<f32>,
+    @builtin(instance_index) draw_id: u32,
+};
+
+struct VertexOutput {
+    @location(0) albedo: vec4<f32>,
+    @builtin(position) position: vec4<f32>,
+};
+
+struct Face {
+    transform: u32,
+    colour: u32,
+};
+
+@group(0) @binding(0)
+var<storage, read> faces: array<Face>;
+
+@vertex
+fn vs_main(
+    input: VertexInput
+) -> VertexOutput {
+    let face = faces[input.draw_id];
+    let transform = face.transform;
+    let direction = transform & 0x07;
+    let x = f32((transform & 0x00000F8) >> 3);
+    let y = f32((transform & 0x0001F00) >> 8);
+    let z = f32((transform & 0x003E000) >> 13);
+    let w = f32((transform & 0x07C0000) >> 18);
+    let h = f32((transform & 0xF800000) >> 23);
+
+    var result: VertexOutput;
+    result.position = vec4(input.position.x + x, input.position.y + y, z, 1.0);
+    result.position.x += w * f32(input.position.x != 0);
+    result.position.y += h * f32(input.position.y != 0);
+    result.position = vec4(result.position.xy * 0.1, result.position.zw);
+
+    result.albedo = vec4(
+        f32(face.colour & 0x000000FF) / 255,
+        f32((face.colour & 0x0000FF00) >> 8) / 255,
+        f32((face.colour & 0x00FF0000) >> 16) / 255,
+        f32((face.colour & 0xFF000000) >> 24) / 255,
+    );
+
+    return result;
+}
+
+struct FragmentOutput {
+    @location(0) albedo: vec4<f32>,
+    @location(1) chunk_id: u32,
+}
+
+@fragment
+fn fs_main(vertex: VertexOutput) -> FragmentOutput {
+    var output: FragmentOutput;
+    output.albedo = vertex.albedo;
+    output.chunk_id = 0;
+    return output;
+}

rendering/src/lib.rs

@@ -0,0 +1,19 @@
+pub mod chunk;
+pub mod plugin;
+pub mod state;
+
+#[derive(
+    Debug,
+    Default,
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    Hash,
+    bevy_ecs::schedule::ScheduleLabel,
+    bevy_app::AppLabel,
+)]
+pub struct Render;
+
+#[derive(Debug, Clone, PartialEq, bevy_ecs::message::Message)]
+pub struct WindowEvent(pub winit::event::WindowEvent);

rendering/src/plugin.rs

@@ -0,0 +1,140 @@
+use crate::{
+    Render, WindowEvent,
+    chunk::{self, renderer::ChunkRenderer},
+    state::RenderState,
+};
+use bevy_app::{App, Plugin, Update};
+use bevy_ecs::{resource::Resource, schedule::Schedule};
+use std::{
+    ops::{Deref, DerefMut},
+    sync::Arc,
+    thread::JoinHandle,
+};
+use tracing::info;
+use winit::{
+    application::ApplicationHandler,
+    dpi::{PhysicalSize, Size},
+    event::WindowEvent as WinitWindowEvent,
+    event_loop::EventLoop,
+    platform::wayland::EventLoopBuilderExtWayland,
+    window::Window,
+};
+
+pub struct RenderPlugin;
+
+#[allow(unused)]
+#[derive(Resource)]
+pub struct RenderPluginState {
+    thread: JoinHandle<()>,
+}
+
+impl RenderPluginState {
+    pub fn is_running(&self) -> bool {
+        !self.thread.is_finished()
+    }
+}
+
+impl Plugin for RenderPlugin {
+    fn build(&self, app: &mut bevy_app::App) {
+        info!("Registering render plugin...");
+        app.add_message::<WindowEvent>();
+
+        let thread = std::thread::spawn(move || {
+            let mut app = App::new();
+            app.add_systems(Update, RenderState::handle_window_events);
+            app.add_schedule({
+                let mut schedule = Schedule::new(Render);
+                schedule.add_systems(ChunkRenderer::render);
+                schedule
+            });
+
+            let event_loop = EventLoop::builder().with_any_thread(true).build().unwrap();
+            event_loop.set_control_flow(winit::event_loop::ControlFlow::Poll);
+            event_loop.run_app(&mut RenderApp(app)).unwrap();
+            info!("Render thread stopped");
+        });
+
+        app.insert_resource(RenderPluginState { thread });
+        app.add_schedule(Schedule::new(Render));
+        app.add_plugins(chunk::mesh_gen::ChunkMesher { thread_count: 1 });
+    }
+
+    fn cleanup(&self, app: &mut bevy_app::App) {
+        let state = app
+            .world_mut()
+            .remove_resource::<RenderPluginState>()
+            .unwrap();
+
+        state.thread.join().unwrap();
+    }
+}
+
+struct RenderApp(App);
+
+impl Deref for RenderApp {
+    type Target = App;
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for RenderApp {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl ApplicationHandler for RenderApp {
+    fn resumed(&mut self, event_loop: &winit::event_loop::ActiveEventLoop) {
+        info!("Creating render state...");
+        let attributes = Window::default_attributes()
+            .with_min_inner_size(Size::Physical(PhysicalSize {
+                width: 1280,
+                height: 720,
+            }))
+            .with_decorations(true)
+            .with_visible(true);
+
+        let window = Arc::new(event_loop.create_window(attributes).unwrap());
+        let state = pollster::block_on(RenderState::new(
+            event_loop.owned_display_handle(),
+            window.clone(),
+        ));
+        self.insert_resource(ChunkRenderer::new(
+            &state.device,
+            &state.surface.get_configuration().unwrap(),
+        ));
+        self.insert_resource(state);
+        window.request_redraw();
+    }
+
+    fn window_event(
+        &mut self,
+        event_loop: &winit::event_loop::ActiveEventLoop,
+        _: winit::window::WindowId,
+        event: WinitWindowEvent,
+    ) {
+        let world = self.world_mut();
+
+        match event {
+            WinitWindowEvent::CloseRequested => {
+                info!("The close button was pressed; stopping");
+                world.remove_resource::<RenderState>();
+                event_loop.exit();
+            }
+
+            WinitWindowEvent::RedrawRequested => {
+                world.run_schedule(Update);
+                world.run_system_cached(RenderState::frame_begin).unwrap();
+                world.run_schedule(Render);
+                world.run_system_cached(RenderState::frame_present).unwrap();
+            }
+
+            _ => {
+                world.write_message(WindowEvent(event.clone()));
+            }
+        }
+    }
+}

rendering/src/state.rs

@@ -0,0 +1,183 @@
+use bevy_ecs::{
+    message::MessageReader, resource::Resource, schedule::ScheduleLabel, system::ResMut,
+    world::World,
+};
+use std::sync::Arc;
+use wgpu::*;
+use winit::{event_loop::OwnedDisplayHandle, window::Window};
+
+use crate::WindowEvent;
+
+#[derive(Resource)]
+pub struct RenderState {
+    pub(crate) instance: Instance,
+    pub(crate) window: Arc<Window>,
+    pub(crate) device: Device,
+    pub(crate) queue: Queue,
+    pub(crate) size: winit::dpi::PhysicalSize<u32>,
+    pub(crate) surface: Surface<'static>,
+    pub(crate) surface_format: TextureFormat,
+}
+
+impl RenderState {
+    pub async fn new(display: OwnedDisplayHandle, window: Arc<Window>) -> Self {
+        let instance = Instance::new({
+            let mut descriptor = InstanceDescriptor::new_with_display_handle(Box::new(display));
+            descriptor.backends = Backends::VULKAN | Backends::GL;
+            descriptor
+        });
+        let adapter = instance
+            .request_adapter(&RequestAdapterOptions::default())
+            .await
+            .unwrap();
+        let (device, queue) = adapter
+            .request_device(&DeviceDescriptor {
+                required_features: Features::MULTI_DRAW_INDIRECT_COUNT
+                    | Features::SHADER_DRAW_INDEX,
+                ..DeviceDescriptor::default()
+            })
+            .await
+            .unwrap();
+
+        let size = window.inner_size();
+
+        let surface = instance.create_surface(window.clone()).unwrap();
+        let cap = surface.get_capabilities(&adapter);
+        let surface_format = cap.formats[0];
+
+        let mut state = Self {
+            instance,
+            window,
+            device,
+            queue,
+            size,
+            surface,
+            surface_format,
+        };
+
+        state.configure_surface();
+        state
+    }
+
+    pub fn window(&self) -> &Window {
+        &self.window
+    }
+
+    pub fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
+        self.size = new_size;
+        self.configure_surface();
+    }
+
+    fn configure_surface(&mut self) {
+        let surface_config = SurfaceConfiguration {
+            usage: TextureUsages::RENDER_ATTACHMENT,
+            format: self.surface_format,
+            view_formats: vec![self.surface_format.add_srgb_suffix()],
+            alpha_mode: CompositeAlphaMode::Auto,
+            width: self.size.width,
+            height: self.size.height,
+            desired_maximum_frame_latency: 2,
+            present_mode: PresentMode::AutoVsync,
+        };
+        self.surface.configure(&self.device, &surface_config);
+    }
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, ScheduleLabel)]
+pub enum RenderPhase {
+    Begin,
+    Draw,
+    Present,
+}
+
+pub trait RenderPass {
+    fn pipeline_id(&self) -> &str;
+    fn draw(&self, encoder: &mut CommandEncoder, texture_view: &TextureView);
+}
+
+#[derive(Resource)]
+pub struct FrameResources {
+    pub screen_view: TextureView,
+    pub screen_texture: SurfaceTexture,
+    pub command_encoder: CommandEncoder,
+}
+
+impl RenderState {
+    pub(crate) fn frame_begin(world: &mut World) {
+        let mut state = world.resource_mut::<RenderState>();
+        let surface_texture = match state.surface.get_current_texture() {
+            CurrentSurfaceTexture::Success(texture) => texture,
+            CurrentSurfaceTexture::Occluded | CurrentSurfaceTexture::Timeout => return,
+            CurrentSurfaceTexture::Suboptimal(texture) => {
+                drop(texture);
+                state.configure_surface();
+                return;
+            }
+            CurrentSurfaceTexture::Outdated => {
+                state.configure_surface();
+                return;
+            }
+            CurrentSurfaceTexture::Validation => {
+                unreachable!("No error scope registered, so validation errors will panic")
+            }
+            CurrentSurfaceTexture::Lost => {
+                state.surface = state.instance.create_surface(state.window.clone()).unwrap();
+                state.configure_surface();
+                return;
+            }
+        };
+        let texture_view = surface_texture.texture.create_view(&TextureViewDescriptor {
+            format: Some(state.surface_format.add_srgb_suffix()),
+            ..Default::default()
+        });
+
+        let mut encoder = state.device.create_command_encoder(&Default::default());
+        {
+            let _clear_screen_pass = encoder.begin_render_pass(&RenderPassDescriptor {
+                label: None,
+                color_attachments: &[Some(RenderPassColorAttachment {
+                    view: &texture_view,
+                    depth_slice: None,
+                    resolve_target: None,
+                    ops: Operations {
+                        load: LoadOp::Clear(Color::BLACK),
+                        store: StoreOp::Store,
+                    },
+                })],
+                depth_stencil_attachment: None,
+                timestamp_writes: None,
+                occlusion_query_set: None,
+                multiview_mask: None,
+            });
+        }
+
+        world.insert_resource(FrameResources {
+            screen_texture: surface_texture,
+            screen_view: texture_view,
+            command_encoder: encoder,
+        });
+    }
+
+    pub(crate) fn frame_present(world: &mut World) {
+        let resources = world.remove_resource::<FrameResources>().unwrap();
+        let state = world.resource_ref::<RenderState>();
+        state.queue.submit([resources.command_encoder.finish()]);
+        state.window.pre_present_notify();
+        resources.screen_texture.present();
+        state.window().request_redraw();
+    }
+
+    pub(crate) fn handle_window_events(
+        mut reader: MessageReader<WindowEvent>,
+        mut state: ResMut<RenderState>,
+    ) {
+        for event in reader.read() {
+            match event.0 {
+                winit::event::WindowEvent::Resized(size) => {
+                    state.resize(size);
+                }
+                _ => {}
+            }
+        }
+    }
+}

terrain/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "voxtech_terrain"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+bevy_ecs = "0.18.1"
+bevy_app = "0.18.1"
+modular-bitfield = "0.13.1"

terrain/src/chunk.rs

@@ -0,0 +1,93 @@
+use std::{
+    ops::{Deref, DerefMut, Index, IndexMut},
+    sync::{Arc, atomic::AtomicU32},
+};
+
+use bevy_ecs::component::Component;
+use modular_bitfield::{
+    bitfield,
+    specifiers::{B1, B21},
+};
+
+pub const SIZE: usize = 32;
+pub const SIZE2: usize = SIZE * SIZE;
+pub const SIZE3: usize = SIZE * SIZE2;
+
+#[bitfield]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Component)]
+pub struct ChunkId {
+    x: B21,
+    y: B21,
+    z: B21,
+    b: B1,
+}
+
+#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Component)]
+pub struct Chunk;
+
+#[derive(Component)]
+pub struct ChunkData(Arc<[AtomicU32; SIZE3]>);
+
+impl ChunkData {
+    pub fn empty() -> Self {
+        unsafe { Self(Arc::new_zeroed().assume_init()) }
+    }
+
+    pub fn solid(voxel_id: u32) -> Self {
+        let mut data = Arc::new_uninit();
+        let inner = Arc::get_mut(&mut data).unwrap();
+        let ptr = inner.as_mut_ptr() as *mut u32;
+        unsafe {
+            for i in 0..SIZE {
+                ptr.add(i).write(voxel_id);
+            }
+            Self(data.assume_init())
+        }
+    }
+
+    #[inline]
+    pub unsafe fn as_unsafe(&self) -> &UnsafeChunkData {
+        unsafe { &*(self.0.as_ptr() as *const UnsafeChunkData) }
+    }
+}
+
+impl Index<[usize; 3]> for ChunkData {
+    type Output = AtomicU32;
+    #[inline]
+    fn index(&self, [x, y, z]: [usize; 3]) -> &Self::Output {
+        &self.0[x + y * SIZE + z * SIZE2]
+    }
+}
+
+pub struct UnsafeChunkData([u32; SIZE3]);
+
+impl Deref for UnsafeChunkData {
+    type Target = [u32; SIZE3];
+
+    #[inline]
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for UnsafeChunkData {
+    #[inline]
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl Index<[usize; 3]> for UnsafeChunkData {
+    type Output = u32;
+    #[inline]
+    fn index(&self, [x, y, z]: [usize; 3]) -> &Self::Output {
+        &self.0[x + y * SIZE + z * SIZE2]
+    }
+}
+
+impl IndexMut<[usize; 3]> for UnsafeChunkData {
+    #[inline]
+    fn index_mut(&mut self, [x, y, z]: [usize; 3]) -> &mut Self::Output {
+        &mut self.0[x + y * SIZE + z * SIZE2]
+    }
+}

terrain/src/lib.rs

@@ -0,0 +1 @@
+pub mod chunk;