use goldy::{
Buffer, BufferFlags, BufferKind, Color, DepositTransaction, DeviceDescriptor, Instance, Lease, LeaseRenderTarget,
MemoryExchange, NodeAccess, PrimitiveTopology, RenderPipeline, RenderPipelineDesc, RequestAdapterOptions,
RetainedPool, Scheme, ShaderModule, SurfaceConfig, SurfaceExchange, TargetLoad, Transaction, Vertex2D,
};
use std::sync::Arc;
use std::time::Instant;
use winit::{
application::ApplicationHandler,
event::WindowEvent,
event_loop::{ActiveEventLoop, ControlFlow, EventLoop},
keyboard::{Key, NamedKey},
window::{Window, WindowId},
};
mod common;
const NUM_SAMPLES: usize = 200;
const NUM_CHANNELS: usize = 4;
fn generate_waveform(time: f32, channel: usize) -> Vec<f32> {
let freq = 1.0 + channel as f32 * 0.5;
let phase = channel as f32 * 0.7;
(0..NUM_SAMPLES)
.map(|i| {
let x = i as f32 / NUM_SAMPLES as f32 * 6.0;
let mut y = 0.0;
y += (x * freq + time * 2.0 + phase).sin() * 0.3;
y += (x * freq * 2.3 + time * 1.7 + phase).sin() * 0.2;
y += (x * freq * 3.7 + time * 0.9 + phase).cos() * 0.15;
y += (x * freq * 5.1 + time * 2.3 + phase).sin() * 0.1;
let noise = ((i as f32 * 1234.5 + time * 100.0).sin() * 43_758.547_f32).fract() - 0.5;
y += noise * 0.05;
y.clamp(-1.0, 1.0)
})
.collect()
}
fn waveform_to_vertices(samples: &[f32], y_offset: f32, color: Color) -> Vec<Vertex2D> {
let scale_y = 0.15;
samples
.iter()
.enumerate()
.map(|(i, &sample)| {
let x = (i as f32 / (NUM_SAMPLES - 1) as f32) * 1.9 - 0.95;
let y = y_offset + sample * scale_y;
Vertex2D::new(x, y, color)
})
.collect()
}
struct App {
instance: Instance,
ctx: Option<goldy::Context>,
device: Option<Arc<goldy::Device>>,
pipeline: Option<RenderPipeline>,
shader: Option<ShaderModule>,
_retained_pool: Option<RetainedPool>,
channel_parcels: Option<[Buffer; NUM_CHANNELS]>,
upload_scheme: Option<Scheme>,
channel_deposits: Option<[DepositTransaction; NUM_CHANNELS]>,
window: Option<Arc<Window>>,
surface: Option<SurfaceExchange>,
present: Option<Transaction>,
scene_rt: Option<Lease<LeaseRenderTarget>>,
scheme: Option<Scheme>,
start_time: Instant,
frame_count: u32,
}
impl App {
fn new() -> anyhow::Result<Self> {
Ok(Self {
instance: Instance::new()?,
ctx: None,
device: None,
pipeline: None,
shader: None,
window: None,
surface: None,
present: None,
scene_rt: None,
scheme: None,
start_time: Instant::now(),
frame_count: 0,
_retained_pool: None,
channel_parcels: None,
upload_scheme: None,
channel_deposits: None,
})
}
fn create_pipeline(
device: &goldy::Device,
shader: &ShaderModule,
surface: &SurfaceExchange,
) -> anyhow::Result<RenderPipeline> {
common::render_pipeline_for_surface(
device,
shader,
surface,
RenderPipelineDesc {
vertex_layout: Vertex2D::layout(),
topology: PrimitiveTopology::LineStrip,
..Default::default()
},
)
}
fn record_scheme(
scheme: &mut Scheme,
surface: &SurfaceExchange,
pipeline: &RenderPipeline,
channel_parcels: &[Buffer; NUM_CHANNELS],
scene_rt: &Lease<LeaseRenderTarget>,
) -> anyhow::Result<Transaction> {
let mut pass = scheme.render_pass(
"waveform",
scene_rt,
TargetLoad::Clear(Color {
r: 0.02,
g: 0.02,
b: 0.08,
a: 1.0,
}),
);
for parcel in channel_parcels {
pass.with_parcel(parcel, NodeAccess::Read);
}
pass.set_pipeline(pipeline);
for parcel in channel_parcels {
pass.set_vertex_buffer(0, parcel);
pass.draw(0..NUM_SAMPLES as u32, 0..1);
}
pass.finish();
surface.bind_render_target(scheme, scene_rt).map_err(Into::into)
}
fn init_gpu(&mut self, window: &Arc<Window>) -> anyhow::Result<()> {
let device = Arc::new(
self.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 shader = ShaderModule::from_slang(&device, goldy::shader::builtins::VERTEX_COLOR_2D)?;
let pipeline = Self::create_pipeline(&device, &shader, &surface)?;
let mut retained_pool = RetainedPool::new(device.clone());
let channel_parcels = std::array::from_fn(|_| {
retained_pool
.acquire_buffer_sized::<Vertex2D>(NUM_SAMPLES as u64, BufferKind::Scattered, BufferFlags::empty())
.expect("waveform channel parcel")
});
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, &pipeline, &channel_parcels, &scene_rt)?;
self.ctx = Some(ctx);
let ctx = self.ctx.as_ref().unwrap();
self.device = Some(device);
self.shader = Some(shader);
self.pipeline = Some(pipeline);
self._retained_pool = Some(retained_pool);
self.channel_parcels = Some(channel_parcels);
let channel_parcels = self.channel_parcels.as_ref().unwrap();
let mut upload_scheme = Scheme::new(ctx);
let memory = MemoryExchange::new(ctx);
let channel_capacity = channel_parcels[0].byte_size();
let channel_deposits = std::array::from_fn(|ch| {
memory
.bind_deposit_buffer(&mut upload_scheme, &channel_parcels[ch], channel_capacity)
.expect("bind channel deposit")
});
self.upload_scheme = Some(upload_scheme);
self.channel_deposits = Some(channel_deposits);
self.surface = Some(surface);
self.present = Some(present);
self.scene_rt = Some(scene_rt);
self.scheme = Some(scheme);
Ok(())
}
fn render_frame(&mut self) -> anyhow::Result<()> {
self.frame_count += 1;
let window = self.window.as_ref().unwrap();
let size = window.inner_size();
if size.width == 0 || size.height == 0 {
return Ok(());
}
let scheme = self.scheme.as_mut().unwrap();
let time = self.start_time.elapsed().as_secs_f32();
let colors = [
Color {
r: 1.0,
g: 0.3,
b: 0.3,
a: 1.0,
},
Color {
r: 0.3,
g: 1.0,
b: 0.3,
a: 1.0,
},
Color {
r: 0.3,
g: 0.5,
b: 1.0,
a: 1.0,
},
Color {
r: 1.0,
g: 0.8,
b: 0.2,
a: 1.0,
},
];
let y_offsets = [0.6, 0.2, -0.2, -0.6];
let upload = self.upload_scheme.as_mut().unwrap();
let channel_deposits = self.channel_deposits.as_ref().unwrap();
for ch in 0..NUM_CHANNELS {
let samples = generate_waveform(time, ch);
let vertices = waveform_to_vertices(&samples, y_offsets[ch], colors[ch]);
channel_deposits[ch].write(upload, 0, bytemuck::cast_slice(&vertices))?;
}
upload.submit()?;
let present = self.present.as_ref().unwrap();
let mut submission = scheme.submit()?;
present.claim(&mut submission)?.consume()?;
Ok(())
}
fn handle_resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
if new_size.width > 0 && new_size.height > 0 {
if let Some(surface) = &self.surface {
let _ = surface.resize(new_size.width, new_size.height);
}
if let (Some(device), Some(surface), Some(shader)) = (&self.device, &self.surface, &self.shader) {
if let Ok(pipeline) = Self::create_pipeline(device, shader, surface) {
self.pipeline = Some(pipeline);
if let (Some(ctx), Some(pipeline), Some(channel_parcels), Some(surface)) = (
self.ctx.as_ref(),
self.pipeline.as_ref(),
self.channel_parcels.as_ref(),
self.surface.as_ref(),
) {
let mut scheme = Scheme::new(ctx);
let (width, height) = surface.size();
if let Ok(rt) = scheme.lease_render_target(width.max(1), height.max(1), surface.format(), None)
{
if let Ok(present) =
Self::record_scheme(&mut scheme, surface, pipeline, channel_parcels, &rt)
{
self.scheme = Some(scheme);
self.present = Some(present);
self.scene_rt = Some(rt);
}
}
}
}
}
}
}
}
impl Drop for App {
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.window.is_none() {
let window = Arc::new(
event_loop
.create_window(
Window::default_attributes()
.with_title("Goldy - Waveform Visualizer (Scheme + Present)")
.with_inner_size(winit::dpi::LogicalSize::new(1024, 600)),
)
.unwrap(),
);
self.window = Some(window.clone());
self.init_gpu(&window).unwrap();
window.request_redraw();
}
}
fn about_to_wait(&mut self, event_loop: &ActiveEventLoop) {
common::exit_if_timed_out(event_loop, self.start_time);
}
fn window_event(&mut self, event_loop: &ActiveEventLoop, _: 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::RedrawRequested => {
if let Err(e) = self.render_frame() {
tracing::error!("Render error: {}", e);
}
self.window.as_ref().unwrap().request_redraw();
}
WindowEvent::Resized(new_size) => {
self.handle_resize(new_size);
if let Some(window) = &self.window {
window.request_redraw();
}
}
_ => {}
}
}
}
fn main() -> anyhow::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 Waveform Example - Press Escape to exit");
let event_loop = EventLoop::new()?;
event_loop.set_control_flow(ControlFlow::Poll);
event_loop.run_app(&mut App::new()?)?;
Ok(())
}