use anyhow::Result;
use goldy::{
Buffer, BufferKind, Color, ComputePipeline, DeviceDescriptor, Instance, Lease, LeaseRenderTarget, NodeAccess,
PrimitiveTopology, RenderPipeline, RenderPipelineDesc, RequestAdapterOptions, RetainedPool, Scheme, ShaderModule,
SurfaceConfig, SurfaceExchange, TargetLoad, Transaction, VertexBufferLayout,
};
use std::sync::Arc;
use winit::{
application::ApplicationHandler,
event::WindowEvent,
event_loop::{ActiveEventLoop, ControlFlow, EventLoop},
keyboard::{Key, NamedKey},
window::{Window, WindowId},
};
mod common;
const NUM_LINES: u32 = 20;
#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
struct Line {
p1: [f32; 2],
v1: [f32; 2],
p2: [f32; 2],
v2: [f32; 2],
color_index: u32,
_pad1: u32,
_pad2: u32,
_pad3: u32,
}
impl goldy::StructuredBufferElement for Line {}
fn main() -> Result<()> {
tracing_subscriber::fmt()
.with_env_filter(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("warn")),
)
.init();
println!("Goldy Bouncing Lines Example");
println!(" Escape - Exit");
let event_loop = EventLoop::new()?;
event_loop.set_control_flow(ControlFlow::Poll);
let mut app = App::default();
event_loop.run_app(&mut app)?;
Ok(())
}
#[derive(Default)]
struct App {
state: Option<RenderState>,
}
struct RenderState {
window: Arc<Window>,
device: Arc<goldy::Device>,
ctx: goldy::Context,
surface: SurfaceExchange,
present: Transaction,
scheme: Scheme,
scene_rt: Lease<LeaseRenderTarget>,
compute_pipeline: ComputePipeline,
_retained_pool: RetainedPool,
line_buffer: Buffer,
render_shader: ShaderModule,
render_pipeline: RenderPipeline,
frame_count: u32,
start_time: std::time::Instant,
}
impl RenderState {
fn create_render_pipeline(
device: &goldy::Device,
render_shader: &ShaderModule,
surface: &SurfaceExchange,
) -> Result<RenderPipeline> {
common::render_pipeline_for_surface(
device,
render_shader,
surface,
RenderPipelineDesc {
vertex_layout: VertexBufferLayout::empty(),
topology: PrimitiveTopology::LineList,
..Default::default()
},
)
.map_err(Into::into)
}
fn record_scheme(
scheme: &mut Scheme,
surface: &SurfaceExchange,
compute_pipeline: &ComputePipeline,
render_pipeline: &RenderPipeline,
line_buffer: &Buffer,
scene_rt: &Lease<LeaseRenderTarget>,
) -> anyhow::Result<Transaction> {
scheme
.node("update_lines", compute_pipeline)
.with_parcel(line_buffer, NodeAccess::ReadWrite)
.dispatch(NUM_LINES.div_ceil(64).max(1), 1, 1);
let bg_color = Color {
r: 0.05,
g: 0.05,
b: 0.1,
a: 1.0,
};
let mut pass = scheme.render_pass("bouncing_lines", scene_rt, TargetLoad::Clear(bg_color));
pass.with_parcel(line_buffer, NodeAccess::Read);
pass.set_pipeline(render_pipeline);
pass.draw(0..2, 0..NUM_LINES);
pass.finish();
surface.bind_render_target(scheme, scene_rt).map_err(Into::into)
}
fn rerecord_scheme(&mut self) {
let mut scheme = Scheme::new(&self.ctx);
let (width, height) = self.surface.size();
if let Ok(rt) = scheme.lease_render_target(width.max(1), height.max(1), self.surface.format(), None) {
self.scene_rt = rt;
if let Ok(present) = Self::record_scheme(
&mut scheme,
&self.surface,
&self.compute_pipeline,
&self.render_pipeline,
&self.line_buffer,
&self.scene_rt,
) {
self.present = present;
self.scheme = scheme;
}
}
}
fn new(window: Arc<Window>) -> Result<Self> {
let instance = Instance::new()?;
let device = Arc::new(
instance
.request_adapter(&RequestAdapterOptions::default())?
.request_device(&DeviceDescriptor::default())?,
);
let ctx = device.create_context()?;
let surface = SurfaceExchange::new(&ctx, window.as_ref(), SurfaceConfig::default())?;
let compute_shader = ShaderModule::from_slang(&device, include_str!("../shaders/bouncing_lines_update.slang"))?;
let render_shader = ShaderModule::from_slang(&device, include_str!("../shaders/bouncing_lines_render.slang"))?;
let mut lines = Vec::with_capacity(NUM_LINES as usize);
for idx in 0..NUM_LINES {
let angle = (idx as f32 / NUM_LINES as f32) * std::f32::consts::PI * 2.0;
lines.push(Line {
p1: [angle.cos() * 0.3, angle.sin() * 0.3],
v1: [0.01 * (idx as f32 * 0.7).cos(), 0.012 * (idx as f32 * 0.9).sin()],
p2: [-angle.cos() * 0.3, -angle.sin() * 0.3],
v2: [-0.011 * (idx as f32 * 1.1).cos(), 0.009 * (idx as f32 * 1.3).sin()],
color_index: idx,
_pad1: 0,
_pad2: 0,
_pad3: 0,
});
}
let mut retained_pool = RetainedPool::new(device.clone());
let line_buffer = retained_pool.acquire_buffer_with_data(&lines, BufferKind::Scattered)?;
let compute_pipeline = ComputePipeline::new(&device, &compute_shader)?;
let render_pipeline = Self::create_render_pipeline(&device, &render_shader, &surface)?;
let mut scheme = Scheme::new(&ctx);
let (width, height) = surface.size();
let scene_rt = scheme.lease_render_target(width.max(1), height.max(1), surface.format(), None)?;
let present = Self::record_scheme(
&mut scheme,
&surface,
&compute_pipeline,
&render_pipeline,
&line_buffer,
&scene_rt,
)?;
println!("Created bouncing lines with {} lines", NUM_LINES);
Ok(Self {
window,
device,
ctx,
surface,
present,
scheme,
scene_rt,
compute_pipeline,
_retained_pool: retained_pool,
line_buffer,
render_shader,
render_pipeline,
frame_count: 0,
start_time: std::time::Instant::now(),
})
}
fn render(&mut self) -> Result<()> {
self.frame_count += 1;
let mut submission = self.scheme.submit()?;
self.present.claim(&mut submission)?.consume()?;
self.window.request_redraw();
Ok(())
}
}
impl Drop for RenderState {
fn drop(&mut self) {
let elapsed = self.start_time.elapsed().as_secs_f64();
let fps = if elapsed > 0.0 {
self.frame_count as f64 / elapsed
} else {
0.0
};
println!(
"GOLDY_PERF: frames={} elapsed={elapsed:.2}s avg_fps={fps:.1}",
self.frame_count
);
}
}
impl ApplicationHandler for App {
fn resumed(&mut self, event_loop: &ActiveEventLoop) {
if self.state.is_none() {
let window = Arc::new(
event_loop
.create_window(
Window::default_attributes()
.with_title("Goldy - Bouncing Lines")
.with_inner_size(winit::dpi::LogicalSize::new(800, 600)),
)
.expect("Failed to create window"),
);
match RenderState::new(window.clone()) {
Ok(state) => {
self.state = Some(state);
window.request_redraw();
}
Err(e) => {
tracing::error!("Failed to create render state: {}", e);
event_loop.exit();
}
}
}
}
fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
if let Some(state) = &self.state {
common::exit_if_timed_out(event_loop, state.start_time);
}
}
fn window_event(&mut self, event_loop: &ActiveEventLoop, _id: WindowId, event: WindowEvent) {
match event {
WindowEvent::CloseRequested => {
event_loop.exit();
}
WindowEvent::KeyboardInput { event, .. } if event.state.is_pressed() => {
if matches!(event.logical_key, Key::Named(NamedKey::Escape)) {
event_loop.exit();
}
}
WindowEvent::Resized(size) => {
if let Some(state) = &mut self.state {
if size.width > 0 && size.height > 0 {
state.surface.resize(size.width, size.height).ok();
if let Ok(pipeline) =
RenderState::create_render_pipeline(&state.device, &state.render_shader, &state.surface)
{
state.render_pipeline = pipeline;
}
state.rerecord_scheme();
}
}
}
WindowEvent::RedrawRequested => {
if let Some(state) = &mut self.state {
if let Err(e) = state.render() {
tracing::error!("Render error: {}", e);
}
}
}
_ => {}
}
}
}