feat: add many_cubes ECS demo with 400 entities
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
@@ -7,6 +7,7 @@ members = [
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"crates/voltex_ecs",
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"examples/triangle",
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"examples/model_viewer",
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"examples/many_cubes",
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]
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[workspace.dependencies]
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16
examples/many_cubes/Cargo.toml
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16
examples/many_cubes/Cargo.toml
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@@ -0,0 +1,16 @@
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[package]
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name = "many_cubes"
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version = "0.1.0"
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edition = "2021"
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[dependencies]
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voltex_math.workspace = true
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voltex_platform.workspace = true
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voltex_renderer.workspace = true
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voltex_ecs.workspace = true
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wgpu.workspace = true
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winit.workspace = true
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bytemuck.workspace = true
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pollster.workspace = true
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env_logger.workspace = true
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log.workspace = true
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369
examples/many_cubes/src/main.rs
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369
examples/many_cubes/src/main.rs
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@@ -0,0 +1,369 @@
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use winit::{
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application::ApplicationHandler,
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event::WindowEvent,
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event_loop::{ActiveEventLoop, EventLoop},
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keyboard::{KeyCode, PhysicalKey},
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window::WindowId,
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};
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use voltex_math::{Vec3, Mat4};
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use voltex_platform::{VoltexWindow, WindowConfig, InputState, GameTimer};
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use voltex_renderer::{
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GpuContext, Camera, FpsController, CameraUniform, LightUniform, Mesh, GpuTexture, pipeline, obj,
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};
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use voltex_ecs::{World, Transform};
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use wgpu::util::DeviceExt;
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/// App-level component: index into the mesh list.
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struct MeshHandle(#[allow(dead_code)] u32);
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struct ManyCubesApp {
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state: Option<AppState>,
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}
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struct AppState {
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window: VoltexWindow,
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gpu: GpuContext,
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pipeline: wgpu::RenderPipeline,
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mesh: Mesh,
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camera: Camera,
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fps_controller: FpsController,
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camera_uniform: CameraUniform,
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light_uniform: LightUniform,
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camera_buffer: wgpu::Buffer,
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light_buffer: wgpu::Buffer,
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camera_light_bind_group: wgpu::BindGroup,
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_texture: GpuTexture,
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input: InputState,
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timer: GameTimer,
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world: World,
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time: f32,
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}
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fn camera_light_bind_group_layout(device: &wgpu::Device) -> wgpu::BindGroupLayout {
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device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
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label: Some("Camera+Light Bind Group Layout"),
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entries: &[
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wgpu::BindGroupLayoutEntry {
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binding: 0,
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visibility: wgpu::ShaderStages::VERTEX | wgpu::ShaderStages::FRAGMENT,
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ty: wgpu::BindingType::Buffer {
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ty: wgpu::BufferBindingType::Uniform,
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has_dynamic_offset: false,
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min_binding_size: None,
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},
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count: None,
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},
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wgpu::BindGroupLayoutEntry {
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binding: 1,
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visibility: wgpu::ShaderStages::FRAGMENT,
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ty: wgpu::BindingType::Buffer {
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ty: wgpu::BufferBindingType::Uniform,
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has_dynamic_offset: false,
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min_binding_size: None,
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},
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count: None,
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},
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],
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})
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}
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impl ApplicationHandler for ManyCubesApp {
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fn resumed(&mut self, event_loop: &ActiveEventLoop) {
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let config = WindowConfig {
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title: "Voltex - Many Cubes (ECS)".to_string(),
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width: 1280,
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height: 720,
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..Default::default()
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};
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let window = VoltexWindow::new(event_loop, &config);
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let gpu = GpuContext::new(window.handle.clone());
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// Parse OBJ
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let obj_src = include_str!("../../../assets/cube.obj");
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let obj_data = obj::parse_obj(obj_src);
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let mesh = Mesh::new(&gpu.device, &obj_data.vertices, &obj_data.indices);
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// Camera at (0, 15, 25) looking down at the grid
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let aspect = gpu.config.width as f32 / gpu.config.height as f32;
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let mut camera = Camera::new(Vec3::new(0.0, 15.0, 25.0), aspect);
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camera.pitch = -0.5;
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let fps_controller = FpsController::new();
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// Uniforms
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let camera_uniform = CameraUniform::new();
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let light_uniform = LightUniform::new();
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let camera_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some("Camera Uniform Buffer"),
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contents: bytemuck::cast_slice(&[camera_uniform]),
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usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
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});
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let light_buffer = gpu.device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
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label: Some("Light Uniform Buffer"),
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contents: bytemuck::cast_slice(&[light_uniform]),
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usage: wgpu::BufferUsages::UNIFORM | wgpu::BufferUsages::COPY_DST,
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});
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// Bind group layouts
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let cl_layout = camera_light_bind_group_layout(&gpu.device);
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let tex_layout = GpuTexture::bind_group_layout(&gpu.device);
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// Bind groups
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let camera_light_bind_group = gpu.device.create_bind_group(&wgpu::BindGroupDescriptor {
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label: Some("Camera+Light Bind Group"),
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layout: &cl_layout,
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entries: &[
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wgpu::BindGroupEntry {
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binding: 0,
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resource: camera_buffer.as_entire_binding(),
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},
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wgpu::BindGroupEntry {
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binding: 1,
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resource: light_buffer.as_entire_binding(),
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},
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],
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});
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// Default white texture
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let texture = GpuTexture::white_1x1(&gpu.device, &gpu.queue, &tex_layout);
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// Pipeline
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let render_pipeline = pipeline::create_mesh_pipeline(
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&gpu.device,
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gpu.surface_format,
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&cl_layout,
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&tex_layout,
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);
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// ECS: spawn 400 entities in a 20x20 grid
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let mut world = World::new();
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let spacing = 1.5_f32;
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let offset = (20.0 - 1.0) * spacing * 0.5;
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for row in 0..20 {
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for col in 0..20 {
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let x = col as f32 * spacing - offset;
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let z = row as f32 * spacing - offset;
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let entity = world.spawn();
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world.add(entity, Transform::from_position(Vec3::new(x, 0.0, z)));
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world.add(entity, MeshHandle(0));
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}
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}
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self.state = Some(AppState {
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window,
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gpu,
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pipeline: render_pipeline,
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mesh,
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camera,
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fps_controller,
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camera_uniform,
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light_uniform,
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camera_buffer,
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light_buffer,
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camera_light_bind_group,
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_texture: texture,
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input: InputState::new(),
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timer: GameTimer::new(60),
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world,
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time: 0.0,
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});
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}
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fn window_event(
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&mut self,
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event_loop: &ActiveEventLoop,
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_window_id: WindowId,
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event: WindowEvent,
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) {
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let state = match &mut self.state {
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Some(s) => s,
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None => return,
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};
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match event {
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WindowEvent::CloseRequested => event_loop.exit(),
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WindowEvent::KeyboardInput {
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event: winit::event::KeyEvent {
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physical_key: PhysicalKey::Code(key_code),
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state: key_state,
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..
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},
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..
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} => {
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let pressed = key_state == winit::event::ElementState::Pressed;
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state.input.process_key(key_code, pressed);
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if key_code == KeyCode::Escape && pressed {
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event_loop.exit();
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}
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}
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WindowEvent::Resized(size) => {
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state.gpu.resize(size.width, size.height);
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if size.width > 0 && size.height > 0 {
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state.camera.aspect = size.width as f32 / size.height as f32;
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}
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}
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WindowEvent::CursorMoved { position, .. } => {
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state.input.process_mouse_move(position.x, position.y);
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}
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WindowEvent::MouseInput { state: btn_state, button, .. } => {
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let pressed = btn_state == winit::event::ElementState::Pressed;
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state.input.process_mouse_button(button, pressed);
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}
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WindowEvent::MouseWheel { delta, .. } => {
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let y = match delta {
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winit::event::MouseScrollDelta::LineDelta(_, y) => y,
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winit::event::MouseScrollDelta::PixelDelta(pos) => pos.y as f32,
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};
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state.input.process_scroll(y);
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}
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WindowEvent::RedrawRequested => {
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// 1. Tick timer
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state.timer.tick();
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let dt = state.timer.frame_dt();
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// 2. Read input state BEFORE begin_frame clears it
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if state.input.is_mouse_button_pressed(winit::event::MouseButton::Right) {
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let (dx, dy) = state.input.mouse_delta();
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state.fps_controller.process_mouse(&mut state.camera, dx, dy);
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}
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let mut forward = 0.0f32;
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let mut right = 0.0f32;
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let mut up = 0.0f32;
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if state.input.is_key_pressed(KeyCode::KeyW) { forward += 1.0; }
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if state.input.is_key_pressed(KeyCode::KeyS) { forward -= 1.0; }
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if state.input.is_key_pressed(KeyCode::KeyD) { right += 1.0; }
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if state.input.is_key_pressed(KeyCode::KeyA) { right -= 1.0; }
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if state.input.is_key_pressed(KeyCode::Space) { up += 1.0; }
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if state.input.is_key_pressed(KeyCode::ShiftLeft) { up -= 1.0; }
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state.fps_controller.process_movement(&mut state.camera, forward, right, up, dt);
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// 3. Clear per-frame input state for next frame
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state.input.begin_frame();
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// 4. Accumulate time for rotation
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state.time += dt;
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// Update view_proj and light (shared across all entities)
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let view_proj = state.camera.view_projection();
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state.camera_uniform.view_proj = view_proj.cols;
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state.camera_uniform.camera_pos = [
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state.camera.position.x,
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state.camera.position.y,
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state.camera.position.z,
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];
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state.gpu.queue.write_buffer(
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&state.light_buffer,
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0,
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bytemuck::cast_slice(&[state.light_uniform]),
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);
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// 5. Render
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let output = match state.gpu.surface.get_current_texture() {
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Ok(t) => t,
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Err(wgpu::SurfaceError::Lost) => {
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let (w, h) = state.window.inner_size();
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state.gpu.resize(w, h);
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return;
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}
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Err(wgpu::SurfaceError::OutOfMemory) => {
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event_loop.exit();
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return;
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}
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Err(_) => return,
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};
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let view = output.texture.create_view(&wgpu::TextureViewDescriptor::default());
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let mut encoder = state.gpu.device.create_command_encoder(
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&wgpu::CommandEncoderDescriptor { label: Some("Render Encoder") },
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);
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{
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let mut render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
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label: Some("Render Pass"),
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color_attachments: &[Some(wgpu::RenderPassColorAttachment {
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view: &view,
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resolve_target: None,
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depth_slice: None,
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ops: wgpu::Operations {
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load: wgpu::LoadOp::Clear(wgpu::Color {
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r: 0.1,
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g: 0.1,
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b: 0.15,
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a: 1.0,
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}),
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store: wgpu::StoreOp::Store,
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},
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})],
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depth_stencil_attachment: Some(wgpu::RenderPassDepthStencilAttachment {
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view: &state.gpu.depth_view,
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depth_ops: Some(wgpu::Operations {
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load: wgpu::LoadOp::Clear(1.0),
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store: wgpu::StoreOp::Store,
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}),
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stencil_ops: None,
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}),
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occlusion_query_set: None,
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timestamp_writes: None,
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multiview_mask: None,
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});
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// Set pipeline and bind groups ONCE
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render_pass.set_pipeline(&state.pipeline);
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render_pass.set_bind_group(0, &state.camera_light_bind_group, &[]);
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render_pass.set_bind_group(1, &state._texture.bind_group, &[]);
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render_pass.set_vertex_buffer(0, state.mesh.vertex_buffer.slice(..));
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render_pass.set_index_buffer(
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state.mesh.index_buffer.slice(..),
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wgpu::IndexFormat::Uint32,
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);
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// Per-entity draw: query ECS for all (Transform, MeshHandle) pairs
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let entities = state.world.query2::<Transform, MeshHandle>();
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for (_entity, transform, _mesh_handle) in &entities {
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// Compute model matrix with time-based Y rotation
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let model = transform.matrix()
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* Mat4::rotation_y(state.time * 0.5);
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state.camera_uniform.model = model.cols;
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// Write updated uniform to GPU buffer
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state.gpu.queue.write_buffer(
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&state.camera_buffer,
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0,
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bytemuck::cast_slice(&[state.camera_uniform]),
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);
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render_pass.draw_indexed(0..state.mesh.num_indices, 0, 0..1);
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}
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}
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state.gpu.queue.submit(std::iter::once(encoder.finish()));
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output.present();
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}
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_ => {}
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}
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}
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fn about_to_wait(&mut self, _event_loop: &ActiveEventLoop) {
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if let Some(state) = &self.state {
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state.window.request_redraw();
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}
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}
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}
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fn main() {
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env_logger::init();
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let event_loop = EventLoop::new().unwrap();
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let mut app = ManyCubesApp { state: None };
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event_loop.run_app(&mut app).unwrap();
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}
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Reference in New Issue
Block a user