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compute_shader_game_of_life.rs
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compute_shader_game_of_life.rs
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//! A compute shader that simulates Conway's Game of Life.
//!
//! Compute shaders use the GPU for computing arbitrary information, that may be independent of what
//! is rendered to the screen.
use bevy::{
prelude::*,
render::{
extract_resource::{ExtractResource, ExtractResourcePlugin},
render_asset::RenderAssetUsages,
render_asset::RenderAssets,
render_graph::{self, RenderGraph, RenderLabel},
render_resource::*,
renderer::{RenderContext, RenderDevice},
Render, RenderApp, RenderSet,
},
window::WindowPlugin,
};
use std::borrow::Cow;
const SIZE: (u32, u32) = (1280, 720);
const WORKGROUP_SIZE: u32 = 8;
fn main() {
App::new()
.insert_resource(ClearColor(Color::BLACK))
.add_plugins((
DefaultPlugins.set(WindowPlugin {
primary_window: Some(Window {
// uncomment for unthrottled FPS
// present_mode: bevy::window::PresentMode::AutoNoVsync,
..default()
}),
..default()
}),
GameOfLifeComputePlugin,
))
.add_systems(Startup, setup)
.run();
}
fn setup(mut commands: Commands, mut images: ResMut<Assets<Image>>) {
let mut image = Image::new_fill(
Extent3d {
width: SIZE.0,
height: SIZE.1,
depth_or_array_layers: 1,
},
TextureDimension::D2,
&[0, 0, 0, 255],
TextureFormat::Rgba8Unorm,
RenderAssetUsages::RENDER_WORLD,
);
image.texture_descriptor.usage =
TextureUsages::COPY_DST | TextureUsages::STORAGE_BINDING | TextureUsages::TEXTURE_BINDING;
let image = images.add(image);
commands.spawn(SpriteBundle {
sprite: Sprite {
custom_size: Some(Vec2::new(SIZE.0 as f32, SIZE.1 as f32)),
..default()
},
texture: image.clone(),
..default()
});
commands.spawn(Camera2dBundle::default());
commands.insert_resource(GameOfLifeImage { texture: image });
}
struct GameOfLifeComputePlugin;
#[derive(Debug, Hash, PartialEq, Eq, Clone, RenderLabel)]
struct GameOfLifeLabel;
impl Plugin for GameOfLifeComputePlugin {
fn build(&self, app: &mut App) {
// Extract the game of life image resource from the main world into the render world
// for operation on by the compute shader and display on the sprite.
app.add_plugins(ExtractResourcePlugin::<GameOfLifeImage>::default());
let render_app = app.sub_app_mut(RenderApp);
render_app.add_systems(
Render,
prepare_bind_group.in_set(RenderSet::PrepareBindGroups),
);
let mut render_graph = render_app.world.resource_mut::<RenderGraph>();
render_graph.add_node(GameOfLifeLabel, GameOfLifeNode::default());
render_graph.add_node_edge(GameOfLifeLabel, bevy::render::graph::CameraDriverLabel);
}
fn finish(&self, app: &mut App) {
let render_app = app.sub_app_mut(RenderApp);
render_app.init_resource::<GameOfLifePipeline>();
}
}
#[derive(Resource, Clone, Deref, ExtractResource, AsBindGroup)]
struct GameOfLifeImage {
#[storage_texture(0, image_format = Rgba8Unorm, access = ReadWrite)]
texture: Handle<Image>,
}
#[derive(Resource)]
struct GameOfLifeImageBindGroup(BindGroup);
fn prepare_bind_group(
mut commands: Commands,
pipeline: Res<GameOfLifePipeline>,
gpu_images: Res<RenderAssets<Image>>,
game_of_life_image: Res<GameOfLifeImage>,
render_device: Res<RenderDevice>,
) {
let view = gpu_images.get(&game_of_life_image.texture).unwrap();
let bind_group = render_device.create_bind_group(
None,
&pipeline.texture_bind_group_layout,
&BindGroupEntries::single(&view.texture_view),
);
commands.insert_resource(GameOfLifeImageBindGroup(bind_group));
}
#[derive(Resource)]
struct GameOfLifePipeline {
texture_bind_group_layout: BindGroupLayout,
init_pipeline: CachedComputePipelineId,
update_pipeline: CachedComputePipelineId,
}
impl FromWorld for GameOfLifePipeline {
fn from_world(world: &mut World) -> Self {
let render_device = world.resource::<RenderDevice>();
let texture_bind_group_layout = GameOfLifeImage::bind_group_layout(render_device);
let shader = world
.resource::<AssetServer>()
.load("shaders/game_of_life.wgsl");
let pipeline_cache = world.resource::<PipelineCache>();
let init_pipeline = pipeline_cache.queue_compute_pipeline(ComputePipelineDescriptor {
label: None,
layout: vec![texture_bind_group_layout.clone()],
push_constant_ranges: Vec::new(),
shader: shader.clone(),
shader_defs: vec![],
entry_point: Cow::from("init"),
});
let update_pipeline = pipeline_cache.queue_compute_pipeline(ComputePipelineDescriptor {
label: None,
layout: vec![texture_bind_group_layout.clone()],
push_constant_ranges: Vec::new(),
shader,
shader_defs: vec![],
entry_point: Cow::from("update"),
});
GameOfLifePipeline {
texture_bind_group_layout,
init_pipeline,
update_pipeline,
}
}
}
enum GameOfLifeState {
Loading,
Init,
Update,
}
struct GameOfLifeNode {
state: GameOfLifeState,
}
impl Default for GameOfLifeNode {
fn default() -> Self {
Self {
state: GameOfLifeState::Loading,
}
}
}
impl render_graph::Node for GameOfLifeNode {
fn update(&mut self, world: &mut World) {
let pipeline = world.resource::<GameOfLifePipeline>();
let pipeline_cache = world.resource::<PipelineCache>();
// if the corresponding pipeline has loaded, transition to the next stage
match self.state {
GameOfLifeState::Loading => {
if let CachedPipelineState::Ok(_) =
pipeline_cache.get_compute_pipeline_state(pipeline.init_pipeline)
{
self.state = GameOfLifeState::Init;
}
}
GameOfLifeState::Init => {
if let CachedPipelineState::Ok(_) =
pipeline_cache.get_compute_pipeline_state(pipeline.update_pipeline)
{
self.state = GameOfLifeState::Update;
}
}
GameOfLifeState::Update => {}
}
}
fn run(
&self,
_graph: &mut render_graph::RenderGraphContext,
render_context: &mut RenderContext,
world: &World,
) -> Result<(), render_graph::NodeRunError> {
let texture_bind_group = &world.resource::<GameOfLifeImageBindGroup>().0;
let pipeline_cache = world.resource::<PipelineCache>();
let pipeline = world.resource::<GameOfLifePipeline>();
let mut pass = render_context
.command_encoder()
.begin_compute_pass(&ComputePassDescriptor::default());
pass.set_bind_group(0, texture_bind_group, &[]);
// select the pipeline based on the current state
match self.state {
GameOfLifeState::Loading => {}
GameOfLifeState::Init => {
let init_pipeline = pipeline_cache
.get_compute_pipeline(pipeline.init_pipeline)
.unwrap();
pass.set_pipeline(init_pipeline);
pass.dispatch_workgroups(SIZE.0 / WORKGROUP_SIZE, SIZE.1 / WORKGROUP_SIZE, 1);
}
GameOfLifeState::Update => {
let update_pipeline = pipeline_cache
.get_compute_pipeline(pipeline.update_pipeline)
.unwrap();
pass.set_pipeline(update_pipeline);
pass.dispatch_workgroups(SIZE.0 / WORKGROUP_SIZE, SIZE.1 / WORKGROUP_SIZE, 1);
}
}
Ok(())
}
}